Air film steel bar truss concrete non-dismantling formwork structure

Abstract

The invention discloses a gas film steel bar truss concrete non-dismantling formwork structure, and particularly relates to the technical field of constructional engineering. Comprising a prefabricated gas film located on the innermost layer; comprising a polyurethane layer, and the outer side of the gas film layer is sprayed with the polyurethane layer. The steel bar truss is positioned on the outer side of the polyurethane layer; two lower chord steel bars of the steel bar truss are horizontally overlapped on the outer side of the polyurethane layer in parallel and are bonded with the polyurethane layer into a whole through concrete; the multiple steel bar trusses are bound and connected through longitudinal steel bars and are fixedly connected into a whole through layered spraying and filling of sprayed concrete; upper chord steel bars and lower chord steel bars of the steel bar truss extend out and are connected with external steel bars in a mechanical connection or welding mode. By the adoption of the technical scheme, the problem of how to smoothly complete butt joint of the two spacecrafts on the premise that structural safety and attitude stability of the spacecrafts are guaranteed is solved, and the adverse effect generated by butt joint collision force can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to an air film steel bar truss concrete non-disassembly formwork structure. Background Art

[0002] In traditional reinforced concrete construction, formwork construction has defects such as waste of resources, high construction cost, and cumbersome formwork process. In addition, after the formwork is cast in a small space, it is not easy to remove the formwork tools. Precast concrete composite slabs have shortcomings such as heavy weight, slow processing speed, and high load-bearing requirements for structural formwork tools.

[0003] Air membrane technology uses special architectural membrane materials as the outer shell. The air membrane structure relies on the flexibility of the material itself and the inherent air tightness of the structure, and relies on the internal and external pressure difference to support the building. The air membrane structure is used for the construction of the building without dismantling the formwork, which overcomes the defects of slow processing speed and complex transportation and construction of precast concrete composite panels, and realizes rapid installation at the construction site. It has the advantages of fast construction speed, convenient operation, and good durability. Summary of the invention

[0004] The present invention aims to provide an air-film reinforced truss concrete formwork structure that does not require disassembly, which solves the problems in the prior art of prefabricated concrete composite slabs having heavy weight, slow processing speed, and high load-bearing requirements for structural formwork tools.

[0005] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: an air-film steel truss concrete non-removable formwork structure, comprising a prefabricated air film, a polyurethane layer, a polyurethane layer, a steel truss and a concrete structural layer, wherein the prefabricated air film is located in the innermost layer; the polyurethane layer is sprayed on the outside of the air film layer; the steel truss is located on the outside of the polyurethane layer; and the concrete structural layer is located on the outside of the polyurethane layer.

[0006] Furthermore, the prefabricated air membrane needs to have a certain tensile strength to ensure that it can withstand the inflation pressure.

[0007] Furthermore, the polyurethane layer increases the rigidity of the air film and acts as a template together with the air film. The polyurethane layer needs to be sprayed 3 to 4 times to meet the design requirements.

[0008] Furthermore, the steel truss comprises at least one upper chord steel bar, two lower chord steel bars and web bars on both sides which are welded or tied together; the two lower chord steel bars of the steel truss are horizontally and parallelly overlapped on the polyurethane layer.

[0009] Furthermore, after the steel trusses are tied on the polyurethane layer, a concrete structural layer is sprayed. The concrete structural layer has the effect of increasing the rigidity of the formwork and reducing deformation during the concrete pouring process. The concrete of the structural layer is preferably 40 mm thick.

[0010] Furthermore, the steel bar trusses are arranged at equal intervals in the transverse direction with the outer surfaces of the prefabricated air membrane and the polyurethane layer as reference planes.

[0011] Furthermore, multiple steel trusses are connected by binding with longitudinal steel bars.

[0012] Furthermore, the upper chord steel bars and the lower chord steel bars of the steel truss extend out and are connected to the external steel bars by mechanical connection or welding.

[0013] Furthermore, the mid-span position of the vertical steel truss should be effectively welded to the main reinforcement of the wall or the tension screw of the other side of the formwork to prevent lateral instability of the formwork.

[0014] Compared with the prior art, this solution has the following beneficial effects:

[0015] This solution can be used for civil and industrial buildings. The air membrane structure is prefabricated in the factory and installed on site. Compared with the traditional prefabricated concrete composite slab, it has the characteristics of fast factory processing speed, easy transportation and installation. Compared with the reinforced concrete structure of the air membrane, the steel truss is used instead of the steel mesh, which effectively improves the load-bearing capacity of the air membrane structure, reduces the dead weight of the structure, and enhances the bending resistance. By adopting the on-site installation method, the steel truss can be adjusted according to the actual use of the building, and the formwork structure inside the building can be quickly constructed without dismantling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an air film steel bar truss concrete non-disassembly formwork structure of the present invention;

[0017] Figure 2 yes Figure 1 Left view of;

[0018] Figure 3 yes Figure 1 A top view of

[0019] Figure 4 is a schematic diagram of a steel bar truss fixed to the outer layer of the polyurethane layer in an embodiment;

[0020] Figure 5 is a schematic diagram of a three-dimensional structure of a steel bar truss in an embodiment;

[0021] Figure 6 It is a detailed drawing of the steel bar truss in the embodiment;

[0022] Figure 7 Schematic diagram of the three-dimensional structure of the steel truss after spraying concrete in the embodiment. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below through specific embodiments:

[0024] The figure marks in the drawings of the specification include: 1-air membrane; 2-vertical steel truss; 3-horizontal steel truss; 4-vertical steel truss extension; 5-polyurethane layer; 6-horizontal steel truss extension; 6-1-horizontal steel truss upper chord steel extension; 6-2-horizontal steel truss lower chord steel extension; 7-web reinforcement; 8-concrete structural layer.

[0025] Example

[0026] like Figures 1 to 7 As shown, an air film steel bar truss concrete non-dismantling formwork structure includes a prefabricated air film 1, a polyurethane layer 5, a steel bar truss (specifically including a vertical steel bar truss 2 and a horizontal steel bar truss 3) and a concrete structural layer 8; the vertical steel bar truss 2 and the horizontal steel bar truss 3 are welded into a frame; the lower surface of the lower chord of the steel bar truss is placed on the polyurethane layer 5 through a concrete pad, and the steel bar truss is connected to the air film 1 and the polyurethane layer 5 through the concrete structural layer 8 to form a whole and bear force together; the upper chord steel bars and the lower chord steel bars are welded or tied to the belly steel bars on both sides; the two ends 6 of the horizontal steel bar truss exceed the non-dismantling formwork, and the lower end 4 of the vertical steel bar truss exceeds the non-dismantling formwork, so that the end extension steel bars of the steel bar truss and the steel bars of the components connected thereto are effectively overlapped, and the extended length of the steel bar truss is determined according to the design requirements;

[0027] Horizontal steel trusses and vertical steel trusses are manufactured according to the size of the air film; the horizontal steel trusses and vertical steel trusses are laid on the upper reference surface of the welding platform of the welding equipment, and spliced ​​into a frame, and then the welding equipment is started to weld to form a prefabricated single steel truss;

[0028] Prefabricated integral steel truss Figure 5 : The prefabricated single steel truss is transferred to the prefabricated air membrane station, and the steel truss is placed on the upper surface of the prefabricated air membrane coated with polyurethane on the reference platform of this station, and then tied or welded to make the prefabricated integral formwork and the steel truss relatively fixed, and the spacing of the truss frame is determined according to the design requirements;

[0029] The air-film reinforced concrete truss non-dismantling formwork structure in the patent of the present invention has the lower chord steel bars of the steel truss parallel and evenly distributed, forming a triangular grid with the upper chord bars, with reasonable force distribution and beautiful appearance; only a small amount of longitudinal or longitudinal steel bars are appropriately arranged at both ends of the air-film reinforced concrete truss non-dismantling formwork structure in the patent of the present invention, which can reduce the amount of steel bars as much as possible while achieving reasonable force distribution, thereby reducing the self-weight and construction cost of the air-film structure.

[0030] The patent of the present invention can produce a more advanced and scientific air film steel bar truss concrete non-removal formwork structure and its construction method. The construction process is as follows: the air film is prefabricated in the factory, transported to the site, blown by a blower, and placed horizontally on a flat ground → spray polyurethane on the outside of the air film to form an insulation layer → prefabricate the overall frame of the steel bar truss according to the size of the air film, including horizontal steel bar trusses and longitudinal steel bar trusses, tie and weld steel bars on the steel bar trusses → weld the horizontal steel bar trusses and longitudinal steel bar trusses into a frame, and the lower surface of the welded prefabricated integral formwork is two lower chords parallel to the plane of the air film → tie longitudinal steel bars between parallel steel bar truss beams → use a spray gun to spray concrete in layers onto the steel bar trusses to form a concrete structural layer → form an air film steel bar truss concrete non-removal formwork structure. This new type of non-removal formwork is transported to the site and stored → hoisted → temporary support installation → wall steel bar tying and pipeline laying → acceptance → wall concrete pouring. So far, the embodiment is used as a permanent non-disassembly formwork for the central hole of a multi-story or high-rise building, and it bears the external load together with the cast-in-place wall, thereby becoming a part of the building wall.

[0031] The above are only embodiments of the present invention, and the common knowledge such as the known specific structures and / or characteristics in the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. An air film steel bar truss concrete formwork structure that does not require dismantling, characterized in that: It includes a prefabricated air membrane, a polyurethane layer, a steel truss and a concrete structural layer, wherein the prefabricated air membrane is located at the innermost layer; the polyurethane layer is sprayed on the outside of the air membrane layer; the steel truss is located on the outside of the polyurethane layer; and the concrete structural layer is located on the outside of the polyurethane layer.

2. The air-film reinforced concrete truss formwork structure according to claim 1 is characterized by: The prefabricated air membrane needs to have a certain tensile strength to ensure that it can withstand the inflation pressure.

3. The air film steel bar truss concrete formwork structure free of disassembly according to claim 1 is characterized by: The polyurethane layer increases the rigidity of the air film and acts as a template together with the air film. The polyurethane layer needs to be sprayed 3 to 4 times to meet the design requirements.

4. The air film steel bar truss concrete formwork structure free of disassembly according to claim 1, characterized in that: The steel truss comprises two parts, a horizontal steel truss and a vertical steel truss. Each truss is formed by welding or binding an upper chord steel bar, two lower chord steel bars and web bars on both sides. The two lower chord steel bars of the steel truss are horizontally parallel and overlapped on the polyurethane layer.

5. The air film steel bar truss concrete formwork structure free of disassembly according to claim 1 is characterized by: After the steel trusses are tied on the polyurethane layer, the concrete structural layer is sprayed. The concrete structural layer has the effect of increasing the rigidity of the formwork and reducing the deformation during the concrete pouring process. The concrete of the structural layer is preferably 40 mm thick.

6. The air film steel bar truss concrete formwork structure free of disassembly according to claim 1, characterized in that: The steel bar trusses are arranged at equal intervals in the transverse direction with the outer surfaces of the prefabricated air membrane and the polyurethane layer as reference planes.

7. The air film steel bar truss concrete formwork structure free of disassembly according to claim 1 is characterized by: Multiple steel trusses are connected by longitudinal steel bars.

8. The air-film steel bar truss concrete formwork structure free of disassembly according to claim 1, characterized in that: The upper chord steel bars and the lower chord steel bars of the steel bar truss extend out and are connected to the external steel bars by mechanical connection or welding.

9. The air film steel bar truss concrete formwork structure free of disassembly according to claim 1, characterized in that: The mid-span position of the vertical steel truss should be effectively welded to the main reinforcement of the wall or the tension screw of the other side of the formwork to prevent lateral instability of the formwork.

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