Claims:1. A reinforced PU composite structural building envelope system possessing the properties of energy efficiency, air tight, optimal weight, cost effective, designed to fit user requirement and high strength to weight ratio, the claimed structural building envelope system essentially comprises of Primary Built-up Members & Primary Framing Systems, Secondary Built-Up Members & Secondary Framing Systems, Roof & Wall Cladding Systems and Accessories wherein
• the said Primary Built-up Members & Primary Framing Systems comprises of plurality of vertical columns and horizontal beams formed from cold rolled chord sections with central web joining the said columns and beams together at predetermined positions by connecting means thereby forming end wall framing, wind bracing system and intermediate frames;
• the said Secondary Built-Up Members & Secondary Framing Systems comprises of plurality of Purlins, Girts and Eave Struts to support and bear load of Roofing and Cladding and transfers the said load to the said Primary Framing;
• the said Roof & Wall Cladding Systems comprises of prefabricated Insulated roofing panel for roof and prefabricated insulated sandwich panel for wall cladding
• the said accessories comprises of anchor bolt, G.I nut & bolts, self-drilling screws, stich screws, butyle tape, rivets silicon sealant, wafer head screws, girt & purlin holder and the like.
characterized in elimination of welding in the said Secondary Built-Up Members & Secondary Framing Systems and utilizing SIP capped with higher thickness “C” capping and suitable fasteners for joining and preparing the claimed structural building envelope system.
2. The structural building envelope system as claimed in claim 1 wherein the said columns and beams are made up of reinforced PU composite.
3. The structural building envelope system as claimed in claim 1 wherein the said chord sections are formed from high yield steel and have a minimum yield strength.
4. The structural building envelope system as claimed in claim 1 wherein the said end wall framing comprises of plurality of columns with pinned ends, plurality of supporting beams and girts flush framed between said columns supported by connecting means thereby providing lateral stability due to diaphragm effect and resist transverse wind force acting on small tributary area of end wall.
5. The structural building envelope system as claimed in claim 1 wherein the said Wind bracing System comprises of plurality of portal frames each comprising of two columns and a beam attached to web of sidewall columns at predetermined positions.
6. The structural building envelope system as claimed in claim 1 wherein the said Intermediate Frames made up of plurality of Columns and Rafters supported by connecting means at predetermined positions to form the said Intermediate Frames.
7. The structural building envelope system as claimed in claim 1 wherein the said purlin is beam type purlin being lapped at support points and nested together to increase stiffness, supports roof panels and provides additional strength and reduces deflection and subjects to loads comprising of gravity loads, wind uplift load and Axial force due to longitudinal wind loads
8. The structural building envelope system as claimed in claim 1 wherein the said grits is flush grits which provides framework for wall cladding both side walls and end walls and subjects to loads comprising of Gravity load, Wind pressure and suction
9. The structural building envelope system as claimed in claim 1 wherein the said Eave Struts comprises of fixing holder, wafer head screws, self-drilling screws , Structural insulated beams, holder and the like
10. The structural building envelope system as claimed in claim 1 wherein the said connecting means is selected from the group comprising of rafter holders, base plate, connection bolts and anchor bolts.
, Description:Figure 1 depicts the sectional view of Reinforced PU composite structural Building
Figure 2a depicts the column of the present invention
Figure 2b depicts the rafters of the present invention
Figure 3 depicts end wall framing of the present invention
Figure 4 depicts the Wind bracing System of the present invention
Figure 5 depicts the Intermediate Frames of the present invention
Figure 6 depicts the Purlins of the present invention
Figure 7 depicts the Flush Girt of the present invention
Figure 8 depicts the roof and wall cladding system of the present invention

SUMMARY OF THE INVENTION:

The present invention discloses a reinforced PU composite structural building envelope system comprises of Primary Built-up Members & Primary Framing Systems, Secondary Built-Up Members & Secondary Framing Systems, Roof & Wall Cladding Systems and Accessories held together by connecting means at predetermined positions. The structural building envelope system of the invention exhibits excellent strength to weight ratio, energy efficiency, increased speed of construction, environmentally responsible, increased building season and highly economical.

DETAILED DESCRIPTION OF THE INVENTION:

The present invention discloses a reinforced PU composite structural column and beam technology.

The Reinforced PU composite structural Building (Figure 1) of the present invention has the following major components:

Major components of the PU composite structural Building are:
* Primary Built-up Members & Primary Framing Systems
* Secondary Built-Up Members & Secondary Framing Systems
* Roof and Wall Cladding Systems
* Accessories

Primary Built-up Members & Primary Framing Systems:
Primary framing\Main framing basically includes the rigid steel frames of the building.
The frame comprises of straight columns (Figure 2a) and rafters (Figure 2b).
The column and beams are formed from two cold rolled chord sections with a central web joining the two together. The chord sections are all formed from high yield steel and have minimum yield strength.
This structure is responsible for transfer of complete building load to the foundations.

The Primary Framing System consists of:
• End wall framing.
• Wind Bracing system.
• Intermediate Frames.

End Wall Framing (Figure 3):-
Made up of reinforced PU composite structural Columns and Rafters. The Frames of Columns and Rafters are supported by rafter holders, base plate, connection bolts and anchor bolts.
The post and beam end wall system of framing consists of columns (posts) with pinned ends, supporting horizontal beams known as end wall rafters. Girts are flush framed between posts to provide lateral stability and a neat appearance. Post and beam end walls are assumed to be laterally stiff due to the diaphragm effect of the wall sheeting. The diaphragm action is proven to be sufficient enough to resist the transverse wind force acting on the small tributary area of the end wall. A typical end wall framing is shown below

Wind bracing System (Figure 4): -
Bracing transfers seismic and wind loads from end walls and sidewalls to the foundation.

When bracing must occur in locations where doors or other accessories would interfere with bracing, a portal frame may be used. A portal frame is comprised of two columns and a rafter made of built-up material and is attached to the web of the sidewall columns.

Intermediate Frames: (Figure 5)
Made up of reinforced PU composite structural Columns and Rafters. The Frames of Columns and Rafters are supported by rafter holders, connection bolts and anchor bolts.

Secondary Built-Up Members & Secondary Framing Systems:
The Secondary Framing System functions to support and bear the load of Roofing and Cladding and transfer its load to the Primary Framing. The Secondary Framing includes the Roof Purlin, Wall Girts, cleat and miscellaneous items.
There is no welding involved in their preparation. They are prepared by SIP capped with higher thickness “C” capping and suitable fasteners.
Secondary Framing System consists of:
• Purlins
• Girts
• Eave Struts

Purlins (Figure 6)
Purlins are secondary members supporting the roof panels. Beam type purlins are adopted for these types of buildings that provide a great advantage of being lapped at support points and nested together to increase the stiffness. This capability provides additional strength and reduces deflection.
The purlins are subjected to the following loads:-
• Gravity loads (dead + live)
• Wind uplift (suction) load
• Axial force due to longitudinal wind loads (especially for the strut purlins)

Girts (Figure 7)
Girts are used to provide framework for wall cladding for sidewalls and end walls. Generally, for sidewalls flush construction is employed for side and end wall girts in order to use diaphragm action effectively. All flush end wall girts are simply supported members attached to the end wall column web by Grits holders.
The girts are subjected to the following loads :-
• Gravity load (dead)
• Wind pressure and suction

Eave Struts: A structural member located at the eave of a building which supports roof and wall paneling.
The Eave Struts are subjected to the following loads :-
• Gravity load [ dead+live]
• Wind uplift [suction] load.

Roof and Wall Cladding Systems (Figure 8):-
Pre-fabricated insulated Sandwich panels are used as roof and wall cladding sheet. It comprises of two single skin panels (plain steel sheets zincalume colour coated) with polyurethane foam insulation in between. These panels are intended for use as thermally efficient roof and wall claddings for buildings e.g. in high altitude areas and cold storages. If the temperature inside the building has to be controlled, insulation of different thickness can be provided.
The sandwich panels are mounted on a secondary member and they transfer transverse loads as wind and snow to the substructure. The panels are subjected to bending moments and transverse forces only. So the wall panels have to be designed for axial loads or a combination of axial and transverse loads. Furthermore horizontal wind loads have to be transferred to the foundation and the building has to be stabilized. Because of the lack of a substructure the sandwich panels also have to transfer the horizontal loads. For this purpose the high in-plane shear stiffness and capacity of the sandwich panels is used.

Erection Method:-

The following sequence is suggested after the foundation has been properly checked and cured.
• Erect braced bay OR second bay from end wall.
• 100 Percent alignment prior to start of the next bay
• Erect end wall
• Erect end bay
• Erect additional intermediate bays
• Erect opposite end wall
• Final Check
• Clean-up
• Each step in the erection sequence contains instructions relative to that particular area of the
building.
• Only the most important aspects of erection are included. Refer to erection drawings at all
times for more specific information and details.
• Installation of wall panel from one corner.
• Fastening panel to secondary frame.
• Installing roof from one side.
• Fixing flashing , gutter and trim.

Thus, the present invention saves the time and money. Further this type of construction can be easily disassembled and reinstalled at other location with minimum wastage.

Accordingly , the present invention addresses the following issues :

• Excellent strength to weight ratio.

• Energy Savings - Typical savings of 35-50% on HVAC Vs. conventional wall. Keeping heat in winter and protecting heat in summer.

• Speed of Construction - Reduced labor costs; contractors can do more jobs over the same amount of time – Typically shortens envelope construction timetable by 50% or more.

• Environmentally Responsible – Recycle ability and reduce reliance on wood-based products.

• All conventional jointing methods, (i.e. riveting, bolting, welding and adhesives) can be employed.

• Increased Building Season – Quick erection of building envelope lengthens the building season in many parts.

• Economical – Most types of SIPs compare very well on a materials cost basis with other types of construction. The real savings comes from reduced installation costs and energy cost savings over time.

In one of the preferred embodiment the present invention shall disclose A reinforced PU composite structural building envelope system possessing the properties of energy efficiency, air tight, optimal weight, cost effective, designed to fit user requirement and high strength to weight ratio. The structural building envelope system of the present invention essentially comprises of Primary Built-up Members & Primary Framing Systems, Secondary Built-Up Members & Secondary Framing Systems, Roof & Wall Cladding Systems and Accessories. The Primary Built-up Members & Primary Framing Systems comprises of plurality of vertical columns and horizontal beams formed from cold rolled chord sections with central web joining the said columns and beams together at predetermined positions by connecting means thereby forming end wall framing, wind bracing system and intermediate frames. The Secondary Built-Up Members & Secondary Framing Systems comprises of plurality of Purlins, Girts and Eave Struts to support and bear load of Roofing and Cladding and to transfer the load to the Primary Framing. The Roof & Wall Cladding Systems comprises of prefabricated Insulated roofing panel for roof and prefabricated insulated sandwich panel for wall cladding. The accessories comprises of anchor bolt, G.I nut & bolts, self-drilling screws, stich screws, butyle tape, rivets silicon sealant, wafer head screws, girt & purlin holder and the like. The invention is characterized in elimination of welding in the Secondary Built-Up Members & Secondary Framing Systems and utilizing SIP capped with higher thickness “C” capping and suitable fasteners for joining and preparing the claimed structural building envelope system.

As per the invention the columns and beams are made up of reinforced PU composite.

According to the invention the chord sections of the structural building envelope system, are formed from high yield steel and have a minimum yield strength.

In accordance with the invention, the end wall framing of the Primary Built-up Members & Primary Framing Systems comprises of plurality of columns with pinned ends, plurality of supporting beams and girts flush framed between columns and are supported by connecting means thereby providing lateral stability due to diaphragm effect and resist transverse wind force acting on small tributary area of end wall.

As per the invention the Wind bracing System of the Primary Built-up Members & Primary Framing Systems, comprises of plurality of portal frames each comprising of two columns and a beam attached to web of sidewall columns at predetermined positions.

According to the invention the Intermediate Frames of the Primary Built-up Members & Primary Framing Systems, is made up of plurality of Columns and Rafters supported by connecting means at predetermined positions to form the Intermediate Frames.

In accordance with the invention the purlin is beam type purlin being lapped at support points and nested together to increase stiffness, supports roof panels and provides additional strength and reduces deflection and subjects to loads comprising of gravity loads, wind uplift load and Axial force due to longitudinal wind loads

As per the invention, the grits is flush grits which provides framework for wall cladding both side walls and end walls and subjects to loads comprising of Gravity load, Wind pressure and suction

According to the invention the Eave Struts comprises of fixing holder, wafer head screws, self-drilling screws , Structural insulated beams, holder and the like

In accordance with the invention the connecting means is selected from the group comprising of rafter holders, base plate, connection bolts and anchor bolts.

Although the invention has now been described in terms of certain preferred embodiments and exemplified with respect thereto, one skilled in art can readily appreciate that various modifications, changes, omissions and substitutions may be made without departing from the spirit thereof. It is intended therefore that the present invention be limited solely by the scope of the following claims.