Field of the Invention
This invention relates to a single lane portable steel bridge and in particular, this invention relates to a single lane portable steel bridge having a standard width or extra wide with steel deck units. This invention relates to a single lane portable steel bridge which is ready to assemble/dismantle a steel bridge which is ideally suited for spanning voids or chasms in difficult terrain which is much faster than the earlier model with timber deck. Furthermore, this invention also relates to a single lane portable steel bridge which has the beneficial effects of having saving manpower cost, reducing labor intensity, and having safety and reliability.
Background of the invention and the related Prior Art
Any composite steel decking experiences three distinct phases of its life history. In the first phase of the life history of the steel decking, the decking is secured to a structural building framework, usually horizontal steel beams which extend between vertical steel columns. The decking sections are assembled in side-by-side relation and engaged with lateral connecting means. The decking sections are secured, usually by welding, to the horizontal beams and serve as a walking surface for various trades in the building construction prior to the pouring of wet concrete on top of the assembled decking sections to establish the building floor. During this first phase, the steel decking sections constitute the only available structural component upon which workmen may walk and move construction vehicles. The steel decking must possess sufficient strength to support the weight of the workmen and anticipated construction traffic.
During the first phase, while the steel decking is in position and. before the wet concrete has been poured, the prior art steel decking is susceptible to serious damage which

may result from localized impact loads when workmen tread heavily upon corners of the decking or when workmen drop heavy construction tools on the decking.
In the second phase of the lifetime of the steel decking, wet concrete is poured over the entire surface of each floor. The wet concrete makes no contribution to the load-carrying capability of the resulting floor. Accordingly, during the second phase of its lifetime, the steel decking must carry not only its own weight but also the weight of the wet concrete. The ability of steel, decking to sustain the load of wet concrete has been characterized as the "wet strength" of the decking. Where the "wet strength" of the decking is inadequate to sustain the weight of wet concrete over the span, it is customary to provide props or shoring to supplement the load-carrying capability of the decking. The inconvenience and expense of such shoring has been a serious shortcoming of many prior art steel decking sections.
The third phase of the life of the steel decking commences after the wet concrete has hardened and the hardened concrete is combined with the steel decking as a composite floor structure. During this third phase, a good mechanical bond exists between the hardened concrete and the steel decking.
The patent document US2006225374 states that a structural steel decking panel for supporting wet concrete and subsequently reinforcing the concrete after it has hardened is disclosed. The decking panel includes an elongate profiled steel sheet having a top side and an underside and a plurality of elongate reinforcing members connected to the sheet. The decking panel is characterized in that the strength of the longitudinal shear connection between the sheet and the reinforcing members is sufficiently high to resist longitudinal shear failure between the reinforcing members and the sheet when the decking panel is subjected to top loading with construction loads and wet concrete.

The other document US2015308116 included structural decking systems with at least a four-layered seam and methods for manufacturing and assembling structural decking systems with at least four-layered seams. The decking panels may be provided with an edge having an exposed "male lip" with two layers, and an opposite edge having a "female lip" with two layers. Individual panels may be coupled together by placing the female lip of a first panel over the male lip of an adjacent panel, thus creating an unjoined seam. In order to couple the panels together, the panels may be secured through various couplings configurations. The couplings may be formed by deforming, cutting, and/or welding the seam. Not only do the couplings help prevent vertical separation between adjacent panels, the couplings minimize lateral shifting along the seam, and ensure a desired level of shear strength in the seam and across the structural decking system.
According to the document US4831675 the orthotropic steel plate deck bridge with a double rib system, is a structural steel member with a steel plate deck welded to a closed steel rib which further is welded to an open steel rib. The double rib system has the capacity to transfer the loads from the bridge deck to the steel bridge structure. The double rib system is used for steel bridges particularly for long spans due to its reduced dead load.
The document US4103861 describes an arrangement for projecting cantilever sections of multi-sectional bridge supporting structures of steel or prestressed concrete forming the superstructure of the bridge which is supported on bridge piles. The arrangement includes at least one traveling auxiliary beam movably carried on and arranged above the superstructure for spanning between superstructure sections. Two concreting scaffolds each comprising a supporting part having crossbeams and rollers are arranged above the superstructure and carry a platform which is arranged below the superstructure for carrying casings to extend the projecting superstructure sections. A transport device is movably carried on the auxiliary beam and supports the concreting scaffolds for transport

between superstructure sections and from the end of a completed section to a bridge pile for beginning construction of a new section. The supporting part of each of the concreting scaffolds has longitudinal girders arranged adjacent the auxiliary beam and crossbars connected to the girders arranged below the auxiliary beam. A pair of supporting blocks for supporting the auxiliary beam on the next succeeding pile are arranged so as to be alternately retractable to allow the supporting part of the scaffolds to pass the bridge pile, and the platform of the scaffolds comprises a bending resistant lattice of crossbeams and girders with means for forming openings therein to allow the platform to pass the pile as the scaffold is transported to the next section.
According to the invention US2010192313 a modular steel bridge is configured by combining at least two steel girder segments, and it includes a bearing block installed to be connected to an upper flange of a connection end of each steel girder segment and a web, and a hinge assembly installed to be attachable to the lower flange of each connection end and hinge-connecting the connection ends.
A steel-concrete composite tower-beam consolidation kilometer grade multi-span suspension bridge comprises a lane formed by a stiffened main girder, vertical suspension cables which are used for suspending the stiffened main girder and are uniformly arranged, main cables for bearing the vertical pressure, two-side anchors for bearing the pressure of main cables, a left cable support tower and a right cable support tower. The utility model is characterized in that at least one middle power is additionally provided between the left cable support tower and the right cable support tower along theaxis of the bridge; at least one middle beam is fixedly connected between each middle beam and the stiffened main girder; the adjacent towers form a span; and at least two spans are connected totallyfor forming the multi-span suspension bridge. The steel-concrete composite tower-beam consolidation kilometer grade multi-span suspension bridge overcomes the defects that the traditional

single-spansuspension bridge can not satisfy the engineering requirement or engineering difficulty when the span is larger than 2000m and the risk is large and the cost is high. The reasonable middle tower rigidity selection can satisfy the deformation and stability requirement of exogenic actions of wind resistance, earthquake resistance, vehicle load, etc. on the large-span bridge which has been stated in document of patent application CN201411627.
The document CN202899015 states a modular highway steel truss bridge which comprises a left truss and a right truss. Two transverse beams are disposed between the left truss and the right truss. A plurality of longitudinal beams are disposed between the two transverse beams. Roadway reinforced concrete bridge decks are arranged on the transverse beams and the longitudinal beams by in-situ casting. Each of the left truss and the right truss comprises an upper chord, a lower chord, diagonals, upper chord joints and lower chord joints. The upper chord, lower chord and diagonals of a main truss are all made of H-beams which can be the same type and different specifications. Segments and parts of the bridge have consistent live load development balance coefficient. The main truss between the left and right trusses consists of an upper horizontal longitudinal connection, a lower horizontal longitudinal connection and a bridge portal frame. The bridge portal frame for transverse connection is disposed on piers and abutments of the bridge. The modular highway steel truss bridge has the advantages that the modular highway steel truss bridge is suitable for single-lane or double-lane steel bridge decks or reinforced concrete bridge decks and is especially suitable for serving as permanent and semi-permanent bridges with double-lane reinforced concrete bridge decks.
The Indian patent document CN204728190 states that a portable steel bridge, relates to a simple and easy bridge, including main crane span structure main crane span structure on be provided with support bridge, main crane span structure both ends be

provided with flexible connecting device, flexible connecting device include the fixed strip, the fixed strip in be provided with the connection the connecting block of main crane span structure, the connecting block on be provided with a plurality of connector link, the connecting block both ends be provided with the spring, support bridge on be provided with the slide, it is provided with the decking to slide on the slide, the decking both ends be provided with connecting device, the decking both sides on still be provided with the detachable railing. Compared with the prior art, the integrative back of this steel of a plurality of slab bridge concatenation, any steel slab bridge's main crane span structure receive the decking that can both guarantee when the silt extrusion is shifted on this main crane span structure still with other steel slab bridge on decking horizontally connect, guarantee the stability of whole passageway, toppling of steel slab bridge prevent.
The invention stated in CN204728191 discloses a portable steel slab bridge, relates to a simple and easy bridge, including main crane span structure main crane span structure on be provided with support bridge, main crane span structure both ends be provided with flexible connecting device, flexible connecting device include the fixed strip, the fixed strip in be provided with.the connection the connecting block of main crane span structure, the connecting block on be provided with a plurality of connector link, the connecting block both ends be provided with the spring, support bridge on be provided with the slide, it is provided with the decking to slide on the slide, the decking both ends be provided with connecting device; Compared with the prior art,, the integrative back of this steel of a plurality of slab bridge concatenation, any steel slab bridge's main crane span structure receive the decking that can both guarantee when the silt extrusion is shifted on this main crane span structure still with other steel slab bridge on decking horizontally connect, guarantee the stability of whole passageway, toppling of steel slab bridge prevent.
The other document 882/KOL/2006 provides timber decking was being used in

making single lane portable steel bridge, popularly known as Bailey bridge. Such bridges were used and erected by various agencies like Indian Army, Border Security Force, Indo-Tibetan Border Authorities and so on, to name just a few, in remote areas, particularly in hilly terrain strewn with ravines, gorges and swift-flowing rivers. The wooden decks required replacement at regular intervals due to natural decay, wear and tear and pilferage, which posed a financial burden on the authorities for agencies. Moreover, due to the National Policy of preserving forest cover and timber wealth, timber decks are becoming scarce.
The other document 17/kol/2003 states that detachable panels forming load-bearing girders on both sides of the bridge ; (b) bracing frames (6) for holding the formed girders firmly in place; (c) a plurality of transoms laid across the bottom chords of panels connecting and spacing the main girders apart and at the same time carrying the steel-decked roadway for allowing two-way flow of traffic; (d) a plurality of base plate and bearing assembly provided at both ends of the bridge on which the terminals or ends of the aforesaid girders rest, characterised in that the load-bearing girders are composed of a number of modular units called panels pinned together at ends and placed side to side, if necessary or desired, and the entire structure is reinforced for safety reasons by the addition of chord reinforcements to the top and bottom of each truss.
None of these above patents, however alone or in combination, disclose the present invention. The invention consists of certain novel features and a combination of parts hereinafter My described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the details may be made without departing from the spirit, or sacrificing any of the advantages of the present invention.

Summary of the invention
This invention relates to a single lane portable steel bridge and in particular, this invention relates to a single lane portable steel bridge having a standard width or extra wide with steel deck units. This invention relates to a single lane portable steel bridge which is ready to assemble/dismantle a steel bridge which is ideally suited for spanning voids or chasms in difficult terrain which is much faster than the earlier model with timber deck. Furthermore, this invention also relates to a single lane portable steel bridge which has the beneficial effects of having saving manpower cost, reducing labor intensity, and having safety and reliability.
Detailed description of the invention with accompanying drawings
For the purpose of facilitating an understanding of the invention, there is illustration in the accompanying drawings a preferred embodiment thereof, from an inspection of which, when considered in connection with the following description, the invention, its construction and operation, and many of its advantages should be readily understood and appreciated. The drawings are in six sheets.
The principal object of the invention is to provide a single lane portable steel bridge.
The other embodiment of the invention is to provide a single lane portable steel bridge having a standard width or extra wide with steel deck units.
The other embodiment of the invention is to provide a single lane portable steel bridge which comprises - (a) Panel with panel pin and sway braces; (b). Bracing frame with bracing bolt, chord reinforcement with short chord bolt, and male/female end post; (c) Transom

equipped with transom clamp and raker; (d) Said transom in turn carry steel decks which may be four numbers or six numbers in a bay, depending on whether the bridge is standard or extra wide; and (e) Base plate fitted with bearings, on which rests the bridge structure.
The other object of the invention is to provide a ready to assemble/ dismantle a steel bridge which is ideally suited for spanning voids or chasms in difficult terrain which is much faster than the earlier model with timber deck.
The other embodiment of the invention is to provide a single lane portable steel bridge which has the beneficial effects of having saving manpower cost, reducing labor intensity, and having safety and reliability.
The other embodiment of the invention is to provide a single lane portablesteel bridge that has the advantages of simple structure and the like and time-saving.
The reference numeral of the Fig. 1 to Fig.6 according to the single lane portable steel bridge of the present invention have described below:
Fig. 1 Illustrated the extra wide double single reinforced bridge with steel decking of the single lane portable steel bridge of the preset invention; where -
No. 1 - illustrates the Panel of the single lane portable steel bridge of the present
invention;
No.2 - illustrates the Panel Pin of the single lane portable steel bridge of the present
invention;
No. 3 - illustrates the Transom Clamp of the single lane portable steel bridge of the
present invention;

No.4 - illustrates the Bracing Frame of the single lane portable steel bridge of the
present invention;
No. 5 - illustrates the Male End Post of the single lane portable steel bridge of the
present invention;
No.6 - illustrates the Short Chord Bo,It of the single lane portable steel bridge of the
present invention;
No.7 - illustrates the Bracing Bolt of the single lane portable steel bridge of the
present invention;
No.8 - illustrates the Bearing of the single lane portable steel bridge of the present
invention;
No.9 - illustrates the Base plate of the single lane portable steel bridge of the present
invention;
No. 10 - illustrates the Transom of the single lane portable steel bridge of the present
invention;
No. 11 - illustrates the Chord Reinforcement of the single lane portable steel bridge of
the present invention;
No. 12 - illustrates the sway Brace of the single lane portable steel bridge of the present
invention;
No.-l 3 - illustrates the Steel Deck (long) of the single lane portable steel bridge of the
present invention;
No. 14 - illustrates the Steel Deck (short) of the single lane portable steel bridge of the
present invention;
No. 15 - illustrates the Centre Deck (long)' (for extra-wide version only) of the single
lane portable steel bridge of the present invention;
No. 16 - illustrates the Centre Deck (short) (for extra-wide version only) of the single
lane portable steel bridge of the present invention;

The steel decking arrangement replacing the timber decking arrangement used for constructing single lane, standard width or extra wide portable steel bridge, components of which can be transported easily and skilled personnel can install and assemble steel decking in lieu of timber decking in no time. Original single lane bridges, popularly called Bailey Bridge, were designed and fabricated with timber decks only. Such wooden decks necessitated replacement at regular intervals mainly due to natural wear and tear, apart from the disadvantages like High cost of well-seasoned timber and their increasing scarcity; Proneness to pilferage; Governmental ban on use of timber to prevent deforestation, and Possibility of fire hazard, particularly during dry months.
Need was being felt for a suitable cost-effective, yet durable replacement of the timber decks, which would benefit a number of agencies like Indian Army, PWD(roads), Border Road Authorities, Indo-Tibetan Border Authorities and various State Governments, particularly in the North eastern States, and also Himachal Pradesh, and Uttarakhand, wherein timber decks were being used. Steel decking arrangement of this invention offered near-permanent solution to the problems outlined above;
Though earlier, portable steel bridges with timber deck were found useful, but in course of time and with the rise in population growth and traffic density, it was noticed that, such bridges with timber deck were becoming bottle-necks, causing hindrance to flow of traffic due to uneven surface of timber deck, for its fast wear and tear under traffic flow and weathering effect as narrated above. Traffic-jam was becoming a regular feature and hence it had become important to come out with a portable steel bridge which would have stable and even surface to ensure a smooth traffic flow on the bridge.
The invention aimed at providing a satisfactory solution to the difficulties and drawbacks encountered in conventional portable steel bridge (Bailey Bridge) with wooden

decking system, as discussed above.
The single lane portable steel bridge is of standard width or extra wide with steel deck units in lieu of wooden decking system, thereby obviating replacement of component parts, particularly deck units, kerbs/ribands, etc., at regular intervals as was usually needed in steel bridges with timber deck.
The steel decking arrangement provides an one time solution to avoid regular replacement of wooden decks in steel bridges which is not only costly but also is a difficult task as seasoned timber is becoming scarce day by day, consequence of the ban on deforestation.
The single-lane portable steel bridge (with steel deck) which is structurally stable, sturdy and capable of withstanding stress and strains of heavy traffic, more easily & efficiently. The steel decking arrangement for a portable steel bridge in which any one or more of the constituent components can be readily replaced, repaired and/ or substituted at ease in the event of wear and tear due to atmospheric corrosion or due to earthquake, flash flood, soil subsidence, etc., without affecting or sacrificing scarce natural resources like wood.
The single lane portable steel bridge of standard width or extra, wide with steel deck units which comprises:
a) Panel with panel pin and sway braces;
b) Bracing frame with bracing bolt, chord reinforcement with short chord bolt, and male/female end post;
c) Transom equipped with transom clamp and raker;

d) Said transom in turn carry steel decks which may be 4 nos or 6 nos in a bay, depending on whether the bridge is standard or extra wide;
e) Base plate fitted with bearings on which the bridge structure rests.
Normally there are four (4) numbers steel decks per bay for the.single lane bridge of standard width. The weight of steel decks including built in kerb are 309 Kg (short deck GBB-2002) and 338 kg (long deck GBB-2003), (being used @ 2 nos each per bay), for decks with 6mm chequered plate topping and 364 Kg 86 399 Kg respectively for decks with 8mm chequered plate topping.
The number of steel decks are six (6) for bridges of extra wide. Additional decks placed along centre line of bridge weighs 156.32 kg (short centre deck GBB-2010) and 170.68 Kg (long centre deck GBB-2011) (being used @ one no. per bay) for 6mm chequered plate topping and 181.54 Kg & 198.44 Kg respectively for 8mm chequered plate topping.
Two numbers steel decks are used at each end of the bridge to connect road way to Deck. The weight of steel deck (Std. End Deck Unit GBB-2008) including built in kerb is 139 Kg with 6mm chequered plate topping and 162 Kg with 8mm chequered plate topping respectively.
For extra wide bridges, One number additional steel deck is placed along centre line of bridge at each end to connect road way to Deck. The weight of steel deck (EW End Centre Deck Unit GBB-2012) is 71 Kg with 6mm chequered plate topping and 82 Kg with 8mm chequered plate topping respectively.
The novel features that are considered characteristic of the present invention are set forth with particularity in the appended claims. The invention itself, however, both as to its

organization and its method of operation, together with additional objects and advantages thereof, will best be understood from the following description of certain specific embodiments, when read in connection with the accompanying drawings, in which:
Fig.2 shows a sectional view of the' Transom', at the end of which there are attached a plurality of "Panels". The thin middle line in each of these columnar figures represents the centre line of each individual'Panel'.
Fig.3 shows perspective views of the Transoms' GBB 2001 STD Steeldeck transom, GBB 2020 EW STeeldeck transom and HD Bolt" GBB 2004 and saddle washer.
The Transom'is composed of an RSJ.manufactured from high tensile steel. On its underside it has recessed dowel, holes, three at each end, which corresponds with down on the' panel seating'. By means of these, the main girders of the bridge are fixed laterally. On its upper side, there are 4 (For standard width version)/ 6 (For extra wide version)' Tee Bolt Sockets' welded for holding Decks and at the outer ends, two lugs which locate the lower end of the 'Raker'. 'Footwalk Bearers' slide over the web of the transom and are fixed by one lug on the web and one lug on the bottom flange.
'H.D Bolt & Saddle Washer' is used for fixing the' Steel Deck Units' with Transom'. T-head of H.D Bolt enters through the slot provided on the 'Socket' of the Transom'. A 'Saddle Washer' covers the elongated hole on 'Deck Unit' and locks it in position with 'nut' and'spring washer'.
The invention will now be described with reference to the accompanying Fig.4, Fig.5 and Fig.6, which shows perspective views of the 'Steel Decks'.

Fig.4 - illustrates the GBB 2002 short STD deck unit and GBB2003 long STD deck unit of the single lane portable steel bridge of the present invention;
Fig 5 - illustrates the GBB2010 EW short centre deck unit and GBB 2011 EW Long center deck unit of the single lane portable steel bridge of the present invention;
Fig 6 - illustrates the GBB 2008 STD end deck unit and GBB 2012 EW end centre deck unit of the single lane portable steel bridge of the present invention.
Steel Deck bridges are available in two roadway widths viz Standard width (3.3 M) and Extra wide (4.25 M).
'Deck Units' are steel fabricated frames using high tensile channels. Top face has chequered plates to provide better wheel grip. Holes are provided for drainage and kerbs are integral to the 'Deck units'.
Without further elaboration; the foregoing will so fully illustrate my invention, that others may, by applying current of future knowledge, readily adapt the same for use under various conditions of service. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the invention.
Advantages over the prior art
The single lane portable steel bridge proposed by the present invention has the following advantages over the prior art:

a) It is cost effective as compared to high cost of well-seasoned timber and their increasing scarcity;
b) It has the characteristics of simple structure, convenient use, high efficiency;
c) It is economical in maintenances;
d) It replaces wooden decks, which care Proneness to.pilferage;
e) It is helpful to prevent deforestation;
f) It prevents the Possibility of fire hazard, particularly during dry months for wooden decks.
In the preceding specification, the invention has been described with reference to specific exemplary embodiments thereof. It will be evident that various modifications and changes may be made thereunto without departing from the broader spirit and scope of the invention as set forth in the claims that follow. The specification and drawings are accordingly to be regarded in an illustrative rather than restrictive sense. Therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of the invention. The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only and not as a limitation. The actual scope of the invention is intended to be defined in the following claims when viewed in their proper perspective based on the prior art.

We claim:
1. A single lane portable steel bridge which consists of:
a) Panel with panel pin and sway braces;
b) Bracing frame with bracing bolt, chord reinforcement with short chord bolt, and male/female end post;
c) Transom equipped with transom clamp and raker;
d) Said transom in turn carry steel decks which may be 4 nos or 6 nos in a bay, depending on whether the bridge is standard or extra wide;
e) Base plate fitted with bearings on which rests the bridge structure.

2. The single lane portable steel bridge as Claim 1 wherein the Steel Deck bridges are available in two roadway widths viz Standard width (3.3 M) and Extra wide (4.25 M).
3. The single lane portable steel bridge as Claim 1 wherein there are four (4) numbers steel decks per bay for the single lane bridge of standard width. The weight of steel decks including built in kerb are 309 kg (short deck GBB-2002) and 338 kg (long deck GBB-2003), (being used @ 2nos each per bay), for decks with 6mm chequered plate topping and 364 kg 85 399 kg respectively for decks with 8mm chequered plate topping.
4. The single lane portable steel bridge as Claim 1 wherein there are six (6) number steel decks per bay for the single lane bridge of extra wide. Additional decks placed along centre line of bridge weighs 156.32 kg (short centre deck GBB-2010) and 170.68 kg (long centre deck GBB-2011) (being used @ one no. per bay) for 6mm chequered plate topping and 181.54 Kg & 198.44 Kg respectively for 8mm chequered plate topping.

5. The single lane portable steel bridge as Claim 1 wherein two (2) numbers steel decks are used at each end of the bridge to connect road way to Deck. The weight of steel deck (Std. End Deck Unit GBB-2008) including built in kerb is 139 Kg with 6mm chequered plate topping and 162 Kg with 8mm chequered plate topping respectively.
6. The single lane portable steel bridge as Claim 1 wherein for extra wide bridges, one (1) number additional steel deck is placed along centre line of bridge at each end to connect road way to Deck. The weight of steel deck (EW End Centre Deck UnitGBB-2012) is 71 Kg with 6mm chequered plate topping and 82 Kg with 8mm chequered plate topping respec¬tively.
7. The single lane portable steel bridge as Claim 1 wherein Deck Units are steel fabri-cated frames using high tensile channels.
8. The single lane portable steel bridge as Claim 1 wherein top face has chequered plates to provide better wheel grip.
9. Steel Decking System of GRSE Portable Steel Bridge (Using 5ft. Panel) substantially as hereinbefore described with particular reference to the accompanying drawings.