Field of the Invention
The present invention relates to portable, modular steel - box earth covered magazine for high explosives with blast door. More particularly the invention relates to portable ECM (Earth Covered Magazine) which is made up of steel and easily transportable on a standard carrier. Even more particularly the invention relates to a portable ECM which reduced the side to side quantity distance and inhabited building distance (IBD) of portable ECMs.
Background of the invention
The storage, handling and use of Military explosives are prone to cause inherent risk to persons and property. The explosives safety originated aftermath of World War I when several ammunition storage areas were destroyed in a series of mishaps. Hence, Explosive Safety Regulations must be followed for Military explosives to avoid damage due to an accidental explosion. As per the Orange book issued by UN on Transportation of Dangerous goods, International System of Classification has been made to promote the safe transport of dangerous goods and its use has since been extended almost universally for control of storage and manufacture as well. Many researchers and inventors have worked on it and developed some related works but they are lacking in design and missing some features due to this explosives are prone to risk of mass explosion. They are made up of reinforced cement concrete (RCC), hence they cannot move from one place to another and also takes much time to build up and they are also having long Quantity Distance and Inhabited Building Distance(IBD). Some of such inventions are discussed below.
Reference has been made to US20190323229 titled “EXPLOSIVE STOREHOUSE CONSTRUCTION”, by Blazley Designs Pty. Ltd dated 24.04.2018 which provides a head wall, a rear wall, two side walls and a single span arched roof; wherein the head wall, rear wall, two side walls and the single span arched roof all include a metal lining located internally of the earth covered magazine explosive storehouse; and wherein at least the two side walls, rear wall and the single span arched roof include shotcrete.
Another reference has been made to US20030033114 titled “EXPLOSIVE SAFETY SITING METHOD”, by The United States of America as represented by the Secretary of the Navy dated 22.05.2001 which provides a method for making a determination of a required separation distance between each of a plurality of potential explosive sites and its associated exposed site. When an actual separation distance is less than the required separation distance mitigation procedures or options are available to resolve a separation distance violation between a potential explosive site and an exposed site.
Another reference has been made to GB203635 titled “Safety magazine for explosives and ammunition”, by FAUSTO BARATTA dated 1923-09-13 which provides a magazine for storing explosives and ammunition is made with double walls 1, 4, a double bottom 2, 5, and a double top 3, 6, all of reinforced concrete forming three chambers 12, 13, 14 which are partially filled with water. The top is protected by two layers of earth 7, 9 with intermediate and top layers 8, 10 of armoured concrete, the topmost layer 10 being in the form of a shallow basin for collecting rain water and supplying same by conduits 11 to the chambers 14, 12. The water fills these chambers partially and overflows from one chamber to another by pipes 15, 16, and to the outside by pipes 24. The interior of the magazine is ventilated by means of pipes 26, 27 and a removable hood 28. The reinforcements of the concrete walls are connected to an earthed wire to protect the magazine from electric discharges. The entrance to the magazine is through a ferro-concrete passage having a double water-tight door and communicating with the exterior by a tunnel crossing a rampart. A thermometer adapted to close an electric circuit to give an alarm if the temperature exceeds a certain value may be provided in the magazine; when such a signal is given, the magazine is flooded by means of a conduit 25. The inner walls may be made waterproof by a lining of hollow bricks covered with hydraulic cement or asphalt.
Another reference has been made to CN113704845A titled “Design method for semi-submersible large-scale explosion experimental tank installation foundation”, by Harbin Engineering University dated 2021-08-05 which discloses the technical field of design and installation of impact-resistant bases, and particularly relates to a design method of an installation foundation of a semi-submersible large-scale explosion experimental tank. The invention provides design requirements and a method for an external building structure of an explosion tank aiming at the transmission process of internal explosion shock wave load and the universality of the explosion experimental tank. The explosion experiment tank can effectively absorb and resist impacts in the vertical and horizontal directions generated by various experiments in the explosion experiment tank, has the functions of fixing and preventing overturn of the explosion tank, has extremely high safety, has the characteristic of easy installation, and has higher use convenience.
Another reference has been made to WO2005078380 titled “CONTAINER FOR CONTAINING AN EXPLOSION”, by CIRILLO, Salvatore dated 11.02.2004 which provides a container (10) for receiving an explosive element and containing fragments projected by an explosion thereof. The container (10) comprising a collapsible seamless enclosure (12) made of walls defining an open end (18) and a closed end. The walls are formed by a plurality of independent interleaved plies of material, the material and number of plies is selected to contain fragments projected by the explosion. The container also comprising an outer casing having a plurality of first and second panels (22, 24) defining a second enclosure for snugly receiving the seamless enclosure (12). The first and second panels (22, 24) being rigid, the first panels being hingedly connected to the second panels such that the first panels are movable between a first deployed configuration, where the first panels define a second open end corresponding to the first open end (18), to a second folded configuration, where the first panels at least partially close the second open end, thereby reducing a height of the outer casing. The container is folded for storage by collapsing the seamless enclosure and moving the first panels of the outer casing in the second folded configuration.
Another reference has been made to WO2006083391 titled “METHODS AND APPARATUS FOR PROVIDING BALLISTIC PROTECTION”, by ARMORDYNAMICS, INC dated 08.12.2004 which provides ballistic protection and stopping high-velocity rounds or explosives. The apparatus may include a ballistic panel for providing ballistic protection. The ballistic panel includes a core that includes a plurality of node cells, an intermediate layer that surrounds the core and fills in the node cells, and an outer coating. The ballistic panel absorbs the force of high-velocity, ballistic, low-velocity, and high foot pound pressure rounds, fragments, and impacts and is capable of completely capturing such ballistic rounds and fragments without external deflection or complete penetration through ballistic panel.
Another reference has been made to CN212413493 titled “MOVABLE STATIC ELIMINATING DEVICE FOR EXPLOSIVE WAREHOUSE”, by PINGYI COUNTY GUOKE MACHINERY EQUIPMENT CO., LTD dated 08.12.2004 which provides a movable type explosive warehouse static electricity eliminating device belongs to the field of movable type explosive warehouse static electricity eliminating and comprises a warehouse body and a warehouse door which are made of steel, the warehouse body and the warehouse door are connected in a rotating mode through a door leaf, a handle made of steel is arranged on the warehouse door, and a wire is arranged between the warehouse body and the warehouse door. A static electricity eliminating rope with good conductivity is arranged at the top end of an inlet of the garage body, and the garage body is connected with the ground through a ground wire. The storeroom body is connected with the storeroom door through the wire, the storeroom body ensures that static electricity is automatically eliminated when a person enters the door, and if a following person does not contact with the handle, the static electricity eliminating rope is arranged to eliminate the static electricity of all persons entering the movable explosive storeroom, so that the static electricity can be eliminated through double static electricity elimination. Therefore, static electricity is safely and reliably eliminated.
Another reference has been made to CN209429618 titled “CIVIL BLASTING MATERIAL WAREHOUSE CONVENIENT TO DISASSEMBLE AND ASSEMBLE”, by JIANGXI GUOTAI CIVIL EXPLOSIVE GROUP CO., LTD dated 14.12.2018 which provides a civil blasting material warehouse convenient to disassemble and assemble. A blasting material using unit is large in mobility, a blasting material warehouse of the blasting material is dismantled along with the blasting material using unit after engineering is completed, the blasting material warehouse can only be used once, a large number of resources and funds are consumed, and a pure steel structure can be dismantled although being capable of being dismantled, but is inconvenient to dismantle and has defects. The utility model relates to a civil explosive material warehouse convenient to disassemble and assemble. Wherein the bottom groove is fixedly connected with the channel steel; wherein the top of the channel steel is fixedly connected with the top plate, an assembling wall is embedded in the bottom groove, the first assembling wall and the second assembling wall are embedded to form an assembling wall, a mounting hole is fixedly formed in a first convex edge of the assembling wall, the first convex edge of the assembling wall is fixedly connected with the channel steel through a quick-release piece and a nut, and the first convex edge of the assembling wall is fixedly connected with the same-side channel steel through a quick-release piece and a nut. The device has the advantages that the wall body can be conveniently and quickly fixed through the quick release pieces, the spliced wall is convenient to splice and carry, and the device is simple and high in practicability.
Another reference has been made to CN211597886 titled “MOBILE EXPLOSIVE STOREHOUSE WITH ANTI-THEFT AND EXPLOSION VENTING FUNCTIONS”, by ZHEJIANG LUJIESHUN AUTOMOBILE MANUFACTURING CO., LTD dated 25.10.2019 which provides a mobile explosive storehouse with anti-theft and explosion venting functions. The invention belongs to the technical field of explosive storage facilities. Explosive warehouse body, an inlet/outlet is formed in the explosive storehouse body; explosion-proof door is arranged at entrance and exit position, an explosion venting opening is formed in the explosive storehouse body. A plurality of layers of parallel protection structures for blocking and separating the explosion venting opening from an inner cavity of the explosive storehouse body are arranged in the explosive storehouse body; a gap is reserved between every two adjacent protection structures, each protection structure comprises a fixing ring of an annular structure, the fixing rings are fixedly arranged on the inner wall of the explosive storehouse body, a plurality of parallel steel pipes are fixedly arranged on the inner sides of the fixing rings, a gap is reserved between every two adjacent steel pipes, and the steel pipes in the protection structures of different layers are arranged in a staggered mode. Due to the arrangement of the multi-layer protection structure, the explosion venting port has good anti-theft, protection and noise elimination effects, and the use performance of the explosion venting port cannot be affected.
Another reference has been made to CN211524231 titled “MOBILE EXPLOSIVE STOREHOUSE WITH EXCELLENT ANTI-EXPLOSION PERFORMANCE”, by ZHEJIANG LUJIESHUN AUTOMOBILE MANUFACTURING CO., LTD dated 25.10.2019 which provides a mobile explosive storehouse with excellent anti-explosion performance. The utility model belongs to the technical field of explosive storage facilities. The explosive warehouse comprises a bottom pit located on the ground and an explosive warehouse body partially buried in the bottom pit. The space, used for storing explosives, in the explosive storehouse body is located below the ground surface, an entrance and exit is formed in the position, located above the ground surface, of the explosive storehouse body, an explosion-proof door is arranged at the entrance and exit, a sandbag pile surrounding the explosive storehouse body is stacked on the outer side of the explosive storehouse body, and a channel is reserved in the position, on the explosion-proof door, of the side face of the sandbag pile. The utility model has excellent anti knock performance, can effectively shorten the required safety distance, and can be used in small-scale places.
Another reference has been made to CN213063099 titled “EXPLOSIVE HAZARDOUS ARTICLE ACTIVITY WAREHOUSE”, by JIANGXI YUANDA SECURITY EQUIPMENT GROUP CO., LTD dated 20.07.2020 which discloses an explosive hazardous article movable storehouse, which belongs to the technical field of movable storehouses and comprises a storehouse wall body, a rain shelter and a storehouse door are respectively arranged on the outer surface of the storehouse wall body, an exhaust fan is arranged on one side of the storehouse wall body, a buffer cushion is arranged on the inner wall of the storehouse wall body, and a flame-retardant layer is arranged on the inner wall of the buffer cushion. A top layer is arranged on the upper portion of the interior of the storehouse wall body, a motor is arranged in the top layer, the output end of the motor is connected with a rotating rod, and the movable storehouse for the explosive hazardous articles is divided into different spaces through the motor, the rotating rod, a fixed block, a damping spring, a movable wall body, an air cylinder, a push plate, universal wheels, a telescopic rod and a threaded groove. Workers can place different types of explosive hazardous articles in different spaces, so that explosion of a certain explosive hazardous article is prevented, and explosion of other explosive hazardous articles is prevented.
Another reference has been made to CN209066961 titled “MOVABLE CIVIL EXPLOSIVE STOREHOUSE”, by JIANGXI GUOTAI INDUSTRIAL EXPLOSIVE MATERIAL GROUP CO., LTD dated 12.10.2018 which discloses a movable civil explosive storehouse. The warehouse comprises a top plate, a warehouse body and movable plates, side plates are welded to the left side and the right side below the top plate. Universal wheels are rotatably connected to the front side and the rear side of the side plate; the rear portion of the storehouse body is in sliding connection with a connecting plate through a first sliding groove. The left end and the right end of the upper portion of the storehouse body are connected with rotating shafts through ropes. a servo motor is mounted on the left side of the rotating shaft; a movable door is hinged to the outer side of the storeroom body. A bearing plate is fixed to the lower end of the interior of the storehouse body, a movable shaft is arranged at the middle end of the right side of the bearing plate, the left side and the right side of the bearing plate are slidably connected with the storehouse body through second sliding grooves, the rear portion of the movable plate is slidably connected with the storehouse body through third sliding grooves, and a guide shaft penetrates through the interior of the movable plate. According to the movable civil explosive storehouse, the storehouse body can be moved, and the flexibility of the device is improved.
Another reference has been made to CN213205082 titled “VEHICLE-MOUNTED MOBILE STOREHOUSE FOR EXPLOSIVE STOREHOUSE”, by LINYI JINYING MINE EQUIPMENT CO., LTD dated 10.08.2020 which discloses a vehicle-mounted mobile storehouse for an explosive storehouse, and mainly relates to the field of explosive storehouses. Comprising a metal framework, and an outer skin, an interlayer and an inner skin are fixedly connected to the metal framework in sequence from outside to inside; a split type warehouse door with the same size as the side face is arranged on one side of the movable warehouse, a door lock is arranged on the warehouse door, four hinged U-shaped handles are symmetrically arranged on outer skins of the two sides, opposite to the warehouse door, of the movable warehouse respectively, and the four U-shaped handles located on the same side face are distributed in a matrix mode. The utility model has the benefits as follows: the explosion-proof box is convenient for the circulation of explosives along with the change of operation places and environments, and has enhanced fire-proof, compression-resistant, moisture-proof, shock-proof, fire-resistant and heat-insulating properties.
Another reference has been made to CN206091407 titled “CONTAINER TYPE INTELLIGENCE STOREHOUSE FOR HAZARDOUS ARTICLES”, by SCEGC NO.5 CONSTRUCTION ENGINEERING GROUP COMPANY LTD dated 31.08.2016 which discloses a container type intelligence storehouse for hazardous articles, including storehouse body and hazardous articles monitoring device, the storehouse body comprises bottom plate, roof and curb plate, the bottom plate is the steel sheet, the curb plate is the cotton color steel sandwich panel of fireproof glass, this internal chemicals frame and inflammable and explosive article frame of being provided with of storehouse, install shutter and air discharge fan on the storehouse body, hazardous articles monitoring device includes microcontroller and the communication module and the host computer that meet with microcontroller, microcontroller's input termination has keyboard circuit and monitor cell, microcontroller's output termination has air discharge fan drive module, shutter drive module, smog alarm circuit, temperature warning circuit and response fire extinguisher. The utility model has the advantages of simple structure and reasonable design, can effectively prevent hazardous articles seepage pollution soil and groundwater, and convenient turnover, can utilize many times, have automatic fire extinguishing's function simultaneously, the security performance is high, convenient to popularize and use.
Another reference has been made to JP2000034827 titled “WALL PROTECTION DEVICE”, by TAKAHASHI TOSHIO dated 17.07.1998 which provide a wall protection device wherein a wall protection material can be mounted simultaneously with the mounting work of a plinth, without requiring special man hours at a construction site, and moreover an external appearance in conformity with the plinth can be easily obtained and a good design can be provided.
SOLUTION: There are provided a plinth engaging metal 3 to be fixed to the lower part of a wall surface 1 to be protected, a plinth 4 which is formed from a section made or a metal and engaged with the metal 3, and a wall protection material 5 which is formed from a section made of a metal and fixed to the top surface of the plinth 4. A protruding piece 32 is provided integrally to the engaging metal 3 and an engaging metal insertion groove 45 for engagement with the piece 32 is formed on the rear side of the plinth 4. And the plinth 4 and wall protection material 5 are formed by extrusion molding, and exposed parts of the plinth 4 and material 5, of the surface side, are covered with thin stainless plates 48, 57 respectively.
However, none of the above discussed inventions discloses a portable, modular steel - box earth covered magazine for high explosives with blast door which is made up of Structural steel components and it is easily transferable on a standard carrier; present invention provides portable ECMs with reduced quantity distance and inhabited building distance which saves tremendous amount of land. The portable ECM is designed to withstand 3-bar blast overpressure safely.
Objectives of the invention
The main objective of the present invention is to provide a Portable Earth Covered Magazine (ECM) for High Explosives (HE).
Another objective of the present invention is to provide portable ECM which is specially designed to avoid any sympathetic detonation.
Another objective of the present invention is to provide a Portable Earth Covered Magazine which is made up of Structural steel.
Another objective of the present invention is to provide wooden lining to avoid any spark.
Another objective of the present invention is to provide pre-engineered earth covered magazine (ECM).
Another objective of the present invention is to provide a series of portable ECM which are placed side to side.
Another objective of the present invention is to provide plinth for earth covered magazine.
Another objective of the present invention is to provide prefabricated base slab components which are made up of steel fibre reinforced concrete (SFRC).
Another objective of the present invention is to provide ECM that is designed to be Modular which can be split into Height, Width, and Depth for easy transportability.
Another objective of the present invention is to provide ECM which is easily transportable and this is being done as per the size of transport vehicles and roads available for a particular location, such as highway standards which limit the sizes of carrier platforms, hence the need for such an invention.
Another objective of the present invention is to provide 900 mm of earth cover on the roof to resist external threats.
Another objective of the present invention is to provide a blast wall in front of ECM, which is made up of locally available soil, filled in boxes made of geotextile and welded steel mesh.
Another objective of the present invention is to provide portable ECM with reduced quantity distance (side to side distance in ‘m’) of 0.5 W1/3 (W is net explosive quantity in Kg.).
Another objective of the present invention is to provide portable ECM to withstand 3-bar blast overpressure safely.
Another objective of the present invention is to provide the Inhabited Building Distance (IBD) on sides and rear is around 16 W1/3 (W is net explosive quantity in Kg).
Summary of the invention
The present invention provides portable, modular steel - box earth covered magazine for high explosives with blast door. The present invention is made up of Structural steel (Mild Steel) components and it can be quickly installed at site. The dimensions of portable ECM are: 4.1x12 m and height 2.7 m. The portable ECM is designed for 3-bar blast overpressure and impulse as per latest standard regulations. The portable ECM has reduced the quantity distance as compared to reinforced cement concrete (RCC) box structure because of fully ductile mild steel structure, the quantity distance (in meter) side to side of portable ECM is of 0.5 W1/3 (W is net explosive quantity in Kg) and inhabited building distance (IBD) (in meter) is 16 W1/3 (W is net explosive quantity in Kg). In the present invention wooden lining are provided to avoid any spark. The present invention provides prefabricated base slab components made of steel fibre reinforced concrete (SFRC) that eliminate any concreting at site; the same can be decided as per the bearing capacity of the soil at a particular location. The present invention provides an earth cover of 900 mm, which provides resistance against any external threat.
Statement of the invention
The present invention provides a Portable, Modular Steel - Box Earth Covered Magazine for High Explosives with Blast Door which is designed to protect their explosive and prevent propagation of an explosion that may occur in an adjacent magazine; the present invention is made up of Structural steel (Mild Steel) components; the portable ECM has reduced the quantity distance as compared to RCC box structure because of fully ductile mild steel structure, the quantity distance (in meter) side to side of portable ECM is of 0.5 W1/3 (W is net explosive quantity in Kg); present invention provide the Inhabited Building Distance (IBD) (in meter) on sides and rear is around 16 W1/3 (W is net explosive quantity in Kg); the portable ECM is designed for 3-bar blast overpressure and impulse as per latest standard regulations.

Brief Description of Drawing
Figure 1: represents schematic diagram of earth cover magazine that includes wing wall (a), Door (b) , wing wall (c) , rectangular ECM of steel (d) , vents (e) & (i) , space for earth fill (f) , earth fill (900)mm (g) and space for earth fill (h).
Figure 2: represents dimensions, elevation, top view and sectional view of earth covered magazine; figure 3 includes door (a), wing wall (b), wing wall (c), vent (d), earth fill behind wing walls & top (e), earth cover (f), ground level (g) and SFRC blocks to make plinth (h).
Figure 3: represents side wall panel of earth covered magazine that includes wide flanged sections welded to plate (a) and mild steel plate (b).
Figure 4: represents side to side quantity distance between two earth covered magazines.
Figure 5: represent inhabited building distance (IBD) between residential area and earth covered magazine.
Detailed description of the invention
It should be noted that the particular description with features, designs, components, construction, working and embodiments set forth in the specification below are merely exemplary of the wide variety and arrangement of instructions which can be employed with the present invention. The present invention maybe embodied in other specific forms without departing from the spirit or essential characteristics thereof. All the features disclosed in this specification may be replaced by similar other or alternative features performing similar or same or equivalent purposes. Thus, unless expressly stated otherwise, they all are within the scope of present invention. Various modifications or substitutions are also possible without departing from the scope or spirit of the present invention. Therefore, it is to be understood that this specification has been described by way of the most preferred embodiments and for the purposes of illustration and not limitation.
Explosive Safety Regulations must be followed for Military explosives to avoid damage due to an accidental explosion.
Abbreviation and Definitions of terms used in the present invention are given below-
• ECM = Earth Covered Magazine, it is a structure; which is built to store ammunition and explosive
• HE = High Explosive
• IBD = Inhabited Building Distance (5) in ‘meter’; the inhabited building distance is the minimum allowable distance between explosive storage areas and public/private places of residence.
o The inhabited building distance is directly proportional to the net explosive quantity present in the earth covered magazine.
• QD = Quantity Distance (4) in ‘meter’, it defines the levels of protection from blast based on relationships between the quantity of explosive material (in Kg.) and distance (in meter); it is the distance between two earth covered magazine side to side.
o The quantity distance is directly proportional to the net explosive quantity present in the earth covered magazine.
• NEQ= Net Explosive Quantity in ‘Kg’, NEQ is the total weight of all explosives substances in a single item, NEQ is used to calculate for safe separation distances which are known as Quantity Distance and Inhabited Building Distance.
• Donor = it is the potential explosive site, to break up during explosion
• Acceptor = it is the exposed site, which is adjacent to the donor igloo
o The separation distance from the donor igloo to the acceptor igloo is prescribed in terms of clear distances from side to side each ECM. These are termed as inter magazine distance or quantity distance between two ECM, these distances are depends upon the net explosive quantity present in the earth covered magazine.
• 0.5 W1/3 & 16 W1/3 = m.kg1/3, the values are provided in metric scaled distances, where the distance is normalized by the cube root of the net explosive quantity (NEQ).
• Blast Overpressure = the release of energy during explosion which created the sudden and intense pressure, instantaneous rise from ambient pressure to a peak incident pressure , this pressure increase or shock front or impulse travels radially outward from the detonation point , this pressure is called as blast overpressure.
• Blast Door= The ECM has a blast door to withstand blast effects from the front.
• SFRC = Steel Fibre Reinforced Concrete
• RCC = Reinforced Cement Concrete
• Plinth = the plinth is a solid frame structure, which is made up of steel bars and concrete.
• Platform= comes with ready-to-use SFRC (Steel Fiber Reinforced Concrete) slabs with easy drainage feature.
• Local Material = resources that can be found readily in large quantity at a particular location or area at a certain time.
• Levelled Plinth = it is the level at which substructure ends (base of earth covered magazine) and superstructure starts (upper portion of magazine), this is the portion of structure between the surface of the surrounding ground (the top level of the soil surrounding the structure that has been prepared and leveled before construction) and surface of the floor, immediately above the ground.
The usual IBD (Inhabited Building Distance) on front of ECM is 22.2 W1/3 (W is net explosive quantity in Kg) as per standard regulations and any reduction will result in tremendous saving of land and most of the ordnance depots are already under pressure to increase storage capacity. The present invention provides minimum side to side distance between two ECMs (4). The Reinforced Concrete ECM are costlier and take lot of time for construction whereas the steel ECM can be assembled at site in days and can also be taken out and re-used at some other site.
The present invention provides an earth cover of 900 mm to resist external threats, although the standard earth cover is 600 mm on the roof.
The present invention provides Portable, Modular Steel - Box Earth Covered Magazine for High Explosives with Blast Door; the ECM is designed to be Modular which can be split into Height, Width, and Depth for easy transportability and it is designed to resist 3-bar blast overpressures and impulse as per latest standard regulations. The present invention is made up of Structural steel (Mild Steel) components (1) which is ductile in nature and prevents fragmentation from the blast and it can quickly install at site (1). The dimensions of portable ECM are: plinth size is 4.1x12 m and height 2.7 m and it is easily transportable on a standard carrier (12 m long platform).
The Earth Covered Magazines (ECM) works on Unit Risk Principle. In which the donor (or potential explosion site) (4) to the acceptor igloo (or exposed site) (4) are prescribed in terms of clear distances from the nearest surfaces of each ECM. These are termed the inter-magazine distance. The donor (4) break up during explosion it contain minimum debris size and distance, it direct blast / fragments in the upward direction while the Acceptor is designed to sustain blast / fragment loads, it is safe and serviceable, it may undergo large plastic deformations and in Acceptor no sympathetic or delayed detonations.
The present invention provides Portable, Modular Steel - Box Earth Covered Magazine for High Explosives with Blast Door which comprises of Structural steel (Mild Steel) components (Flats, built up sections etc.); the portable ECM is made up of structural steel (mild steel) contains a door 1(e), vents 1(i) are provide adjacent to the door (both side or one side of the door), Wing wall 1(a) & 1(c) are provided both side of the door in triangular shape, side wall 1(d) is rectangular in shape and made up of mild steel that include mild steel plate 3(b) and wide flanged sections welded to plate 3(a), space for earth 1(f), vents 1(e) provides for proper ventilation; the portable earth covered magazine is pre-engineered and it will be quickly install at site; the dimensions of portable ECM are plinth size 2(h) is 4.1x12 m and height 2.7 m with storage capacity of 6.5 tons NEQ and it is easily transportable on a standard carrier (12 m long), a levelled plinth is the only thing required for the ECM at any site. The width of 64000 kg NEQ earth covered magazine excluding wing wall (2) is 9000 mm, height of earth covered magazine excluding earth cover (2) is 4500 mm, the earth cover thickness (2) is 900 mm, the length of earth covered magazine (2) is 27000 mm; the blast wall is made up of locally available soil, filled in boxes made up of geotextile and welded steel mesh and it will be provided in front of earth covered magazine to reduce debris distance in case of accidental explosion, provision for adequate ventilation 1(e) & 1(i) is present in a portable ECM, the portable ECM is designed for 5 to 150 tons net explosive quantity as per the nature of stored material (Bare Charge, Filled ammunition).
The portable ECM has a strong blast door to withstand 3 bar blast overpressure safely. The side to side distance between two ECM (4) can be kept as bare minimum which is just outside the crater formed in case of an accidental explosion in one of the ECM. The portable ECM has reduced the quantity distance as compared to RCC box structure because of fully ductile mild steel structure, the quantity distance (in meter) side to side of portable ECM (4) is of 0.5 W1/3 (W is net explosive quantity in Kg). The portable ECM is made up of fully ductile components the inhabited building distance (IBD) (in meter) from an exploding ECM will be lesser than reinforced concrete ECM. The present invention provides inhabited building distance (IBD) (in meter) on sides and rear (5) is around 16 W1/3 (W is net explosive quantity in Kg). The portable ECM which is made up of steel can be assembled at site very quickly as compared to reinforced Concrete ECM.
The present invention provides wooden lining inside the ECM for avoiding any friction spark with steel and at the same time it will provide insulation also. A suitable blast wall made of local material (locally available soil) will be provided in front of ECM to reduce debris distance in case of accidental explosion. The present invention also provides an earth cover of 900 mm on the roof to resist external threats. The present invention includes pre-fabricated base slab (platform) components made up of steel fibre reinforced concrete (SFRC) with easy drainage feature and it can eliminate any concreting at site. The same can be decided as per the bearing capacity of the soil at a particular location.
The present invention provides Portable, Modular Steel - Box Earth Covered Magazine for High Explosives with Blast Door which are designed to protect their explosive and prevent propagation of an explosion that may occur in an adjacent magazine (4).
Referring to figure 1 is the schematic diagram of ECM that comprises of wing wall 1(a), door 1(b), wing wall 1(c), rectangular earth covered magazine of steel 1(d), vents 1(e) & 1(i) are provided for adequate ventilation, earth fill (900 mm) 1(g) and space for earth fill 1(f) & 1(h) are provided back side of the wings 1(a) & 2(c).
Referring to figure 2, that represents dimensions of magazine, elevation, top view and sectional view of earth covered magazine; it includes door 2(a), wing wall 2(b) is left side of the door, wing wall 2(c) is the right side of the door, vent 2(d) can be provided both side or one side of the door, earth fill behind wing walls & top 2(e), an earth cover 2(f) is provided on the roof of 900 mm in thickness, the sectional view A-A represents ground level 2(g) of ECM and SFRC blocks to make plinth 2(h). The width of earth covered magazine excluding wing wall (2) is 9000 mm, height of earth covered magazine excluding earth cover (2) is 4500 mm, the earth cover thickness (2) is 900 mm and the length of earth covered magazine (2) is 27000 mm.

Referring to figure 3 is the side wall panel of earth covered magazine that includes wide flanged sections welded to plate 3(a) and mild steel plate 3(b).
Referring to figure 4 that show side to side quantity distance of magazines is 20m when the net explosive quantity present in the magazine is 64,000 Kg. The quantity distance of earth covered magazine is depends upon the net explosive quantity present in the magazine (4) and quantity distance is directly proportional to the net explosive quantity present in the earth covered magazine. If the explosion occurs in earth covered magazine-1 (termed as donor) then the other magazine (termed as acceptor) are safe because acceptor is placed at safe quantity distance and designed to sustain blast / fragment loads, it is safe and serviceable and in acceptor no sympathetic or delayed detonations occurs.
Referring to figure 5 that show the inhabited building distance of magazine is 640m from residential area when the net explosive quantity 64,000 Kg present in the earth covered magazine. The inhabited building distance (IBD) is directly proportional to the net explosive quantity present in the earth covered magazine.
In an embodiment, said magazine provides a Portable, Modular Steel - Box Earth Covered Magazine for High Explosives with Blast Door.
In another embodiment, said pre-fabricated base slab components are used as per bearing capacity of the soil at a particular location, which are made up of steel fibre reinforced concrete (SFRC) 2(h) with easy drainage feature and it eliminates any concreting at site.
In another embodiment, said earth covered magazine is made up of fully ductile components which is structural steel (mild steel) components (1); the said ECM is designed to be Modular which can be split into height, width, and depth for easy transportability; ECM is pre-engineered and it can be quickly installed at site; earth cover magazine can easily transportable on a standard carrier.
In another embodiment, said the portable earth cover magazine has reduced the quantity distance (4) as compared to reinforced cement concrete (RCC) box structure because the magazine is made up of fully ductile mild steel structure.
In another embodiment, said side wall 1(d) which is rectangular in shape; consists of mild steel plate 3(b) and welded wide flanged sections to the plate 3(a).
In another embodiment, said plinth size is 4.1x12 m and height 2.7 m of portable earth covered magazine 2(h), the capacity of this ECM is 6.5 tons NEQ; a leveled plinth is the only thing required for the earth covered magazine at any site.
In another embodiment, said blast wall made up of locally available soil, filled in boxes made up of geotextile and welded steel mesh and it will be provided in front of earth covered magazine to reduce debris distance in case of accidental explosion.
In another embodiment, said earth cover of 900 mm in thickness over the ECM will be placed at site only, earth cover provides resistance against external threat.
In another embodiment, said wing wall 1(a) & 1(c) is provided on both sides of the door, and space for earth fill is provided on the backside of the wing wall 1(f) & 1(h).
In another embodiment, said portable ECM (1) has a strong blast door 1(b) to withstand 3-bar blast overpressure safely, the portable ECM is designed for 3-bar blast overpressure and impulse.
In another embodiment, said vents 1(e) & 1(i) is provided for adequate ventilation.
In another embodiment, said wooden lining is provided inside the magazine to avoid any friction spark with steel and also provide insulation inside the magazine.
In another embodiment, said magazine provides inhabited building distance (IBD) (in meter) from an exploding earth cover magazine on sides and rear is around 16 W1/3 (W is net explosive quantity in Kg) (5), which is much less than the standard value (22.5 W1/3).
In another embodiment, said magazines are placed side to side in a series (4) at a quantity distance (in meter) of 0.5 W1/3 (W is net explosive quantity in Kg) (4).
In another embodiment, said portable ECM (1) is designed for capacity of 5 to 150 tons net explosive quantity as per the nature of stored material (Bare Charge, Filled ammunition).
While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from this invention in its broader aspects and, therefore, the aim in the present invention is to cover all such changes and modifications as fall within the true spirit and scope of this invention.
Advantages of this invention
1. Quick installation at site.
2. It can be moved to new location at minimal cost.
3. Cost effective as compared to reinforced concrete box structure.
4. Side to Side distance (in meter) of a portable ECM is 0.5 W1/3 (W is net explosive quantity)
5. Quantity distances are reduced as compared to RCC box structure because of fully ductile mild steel structure.
6. Service life is better.
7. Wooden lining inside to avoid any spark etc.
8. It reduces the Inhabited Building Distance (IBD) on sides and rear.
9. It reduces the inhabited building distance (IBD) to 16 W1/3 (W is net explosive quantity) on sides and rear that saved tremendous land.
10. The ECM is made of steel which is ductile in nature and limits fragmentation from the blast.

We Claim:

1. A portable, modular steel - box earth covered magazine for high explosives with blast door comprising of pre-fabricated base slab components, pre-engineered earth cover magazine, structural steel (mild steel) components; blast wall, a strong blast door 1(b) to withstand 3-bar blast overpressure safely, vents 1(e) & 1(i), wing wall 1(a) & 1(c), side wall 1(d), a wooden lining inside the magazine, insulation inside the magazine; the said magazines is designed to protect their explosive and prevent propagation of an explosion that may occur in an adjacent magazine (4); the said magazine provides inhabited building distance (IBD) (in meter) from an exploding earth cover magazine is 16 W1/3 (W is net explosive quantity in Kg) (5); the said magazines are placed side to side (4) in a series at a quantity distance (in meter) of 0.5 W1/3 (W is net explosive quantity in Kg) (4).
2. The magazine as claimed in claim 1, wherein said pre-fabricated base slab components are used as per bearing capacity of the soil at a particular location, which are made up of steel fibre reinforced concrete (SFRC) 2(h) with easy drainage feature and it eliminates any concreting at site.
3. The magazine as claimed in claim 1, wherein said earth covered magazine is made up of fully ductile components which is structural steel (mild steel) components (1); the said ECM is designed to be Modular which can be split into height, width, and depth for easy transportability; ECM is pre-engineered and it can quickly install at site; earth cover magazine can easily transportable on a standard carrier.
4. The magazine as claimed in claim 1, wherein said the portable earth cover magazine has reduced the quantity distance (4) as compared to reinforced cement concrete (RCC) box structure because the magazine is made up of fully ductile mild steel structure.
5. The magazine as claimed in claim 1, wherein said side wall 1(d) which is rectangular in shape; consists of mild steel plate 3(b) and welded wide flanged sections to the plate 3(a).
6. The magazine as claimed in claim 1, wherein said plinth size is 4.1x12 m and height 2.7 m of portable earth covered magazine 2(h), the capacity of this ECM is 6.5 ton NEQ; a leveled plinth is the only thing required for the earth covered magazine at any site.
7. The magazine as claimed in claim 1, wherein said blast wall made up of locally available soil, filled in boxes made up of geotextile and welded steel mesh and it will be provided in front of earth covered magazine to reduce debris distance in case of accidental explosion.
8. The magazine as claimed in claim 1, wherein said earth cover of 900 mm in thickness over the ECM will be placed at site only, earth cover provides resistance against external threat.
9. The magazine as claimed in claim 1, wherein said wing wall 1(a) & 1(c) is provided on both sides of the door, and space for earth fill is provided on the backside of the wing wall 1(f) & 1(h).
10. The magazine as claimed in claim 1, wherein said portable ECM (1) has a strong blast door 1(b) to withstand 3-bar blast overpressure safely, the portable ECM is designed for 3-bar blast overpressure and impulse.
11. The magazine as claimed in claim 1, wherein said vents 1(e) & 1(i) is provided for adequate ventilation.
12. The magazine as claimed in claim 1, wherein said wooden lining is provided inside the magazine to avoid any friction spark with steel and also provide insulation inside the magazine.
13. The magazine as claimed in claim 1, wherein said magazine provides inhabited building distance (IBD) (in meter) from an exploding earth cover magazine on sides and rear is around 16 W1/3 (W is net explosive quantity in Kg) (5), which is much less than the standard value (22.5 W1/3).
14. The magazine as claimed in claim 1, wherein said magazines are placed side to side in a series (4) at a quantity distance (in meter) of 0.5 W1/3 (W is net explosive quantity in Kg) (4).
15. The magazine as claimed in claim 1, wherein said portable ECM (1) is designed for capacity of 5 to 150 tons net explosive quantity as per the nature of stored material (Bare Charge, Filled ammunition).