CN116005871A - Assembled light steel reinforced concrete strip laminated unidirectional floor slab with hollow steel trusses and manufacturing method thereof - Google Patents

Abstract

The invention discloses an assembled light steel reinforced concrete strip laminated unidirectional floor slab with a hollow steel bar truss and a manufacturing method thereof, and relates to the technical field of assembled building structure engineering. The leveling system comprises a concrete bottom plate formed by pouring concrete through a concrete bottom plate reinforcing mesh, a bending-resistant structure-with-empty-web reinforced truss concrete strip connected with the concrete bottom plate through a reinforced truss, a laminated layer structure for enabling the concrete bottom plate, the concrete strip with the empty-web reinforced truss and the reinforced truss to form an integral floor slab, a light square steel pipe bending-resistant reinforced structure connected with the concrete strip through bolts, and leveling nodes capable of leveling adjacent floor slabs through tightening the bolts. The floor slab has the characteristics of high rigidity, good bending resistance and good integrity, and has high construction efficiency and good construction quality when being installed.

Description

Assembled light steel reinforced concrete strip laminated unidirectional floor slab with hollow steel trusses and manufacturing method thereof

Technical Field

The invention belongs to the technical field of assembled building structure engineering, and particularly relates to an assembled light steel reinforced concrete strip laminated unidirectional floor slab with a hollow steel truss and a manufacturing method thereof.

Background

Development of assembled buildings, development and innovation of novel prefabricated parts and assembly technology are important ways for realizing building industrialization. The assembled steel structure has the advantages of high standardization degree, high construction speed, good anti-seismic performance and the like, is well-developed and applied in the fields of industrial and civil buildings, such as stadiums, factory workshops, large-span exhibition halls and the like, but has still unsatisfactory popularization and application effects in large-scale residential buildings, one of the important reasons is that the assembled steel structure building is lack of a floor system which is matched with the assembled steel structure building and has high assembly rate, convenient and fast construction and high-efficiency stress, and the construction period of the traditional cast-in-situ floor is long, so that the advantage of quick construction of the steel structure is seriously influenced.

For conventional prefabricated panels or semi-prefabricated panels, the unidirectional panels are weak against bending. Taking a steel bar truss floor support plate and a truss reinforced concrete composite floor slab as examples: when no temporary support is arranged, the self weight of the precast slab, the weight of concrete and the construction live load are all borne by the precast slab in the construction stage; the using stage is as follows: when the strength of the cast-in-situ layer concrete does not reach the design value, the load mainly comprises the dead weight of the steel bar truss, the dead weight of the prefabricated layer, the dead weight of the superposed layer and the construction live load, and the load is borne by the steel bar truss and the prefabricated plate. If temporary supports such as full-hall scaffolds are arranged, the construction period can be prolonged, the construction space of the lower part of the floor slab is occupied, and the rapid assembly construction of the steel structure is not facilitated.

The traditional prefabricated floor slab has large self weight and high transportation and hoisting difficulty. In order to improve the bending resistance of the traditional precast floor slab in the construction stage, the bottom plate concrete layer is thicker, so that the dead weight of the floor slab is improved, and the floor slab is easy to crack when concentrated load and dynamic load are received in the transportation and hoisting processes.

The traditional prefabricated floor slab has large thickness and poor integrity. For example, the bottom plate rib of the profiled steel sheet composite floor slab commonly used in the assembled steel structure at present is high, so that the upper plate thickness and the building clear height are limited, the profiled steel sheet composite floor slab is not suitable for being used in high-rise and super-high-rise buildings, meanwhile, the profiled steel sheet is wavy, the bidirectional rigidity is inconsistent, and the earthquake resistance in the direction perpendicular to the plate rib is weak.

The traditional prefabricated floor slab has high manufacturing cost and lower economic benefit. For example, the profiled steel sheet composite floor slab and the steel bar truss floor support plate composite floor slab are mostly made of galvanized steel sheets as templates, so that the manufacturing cost is high, and the composite floor slab is inconvenient to disassemble and then can be recycled.

The traditional prefabricated floor slab has the defects of high installation difficulty and difficult butt joint and leveling between adjacent floor slabs. The assembly type construction process is limited by component manufacturing errors and hoisting precision, the problems of butt joint dislocation of adjacent floors or uneven bottoms of the floors are common, and if the dislocation is large, the problems of concrete leakage, incompact and the like can occur, so that water leakage can be caused, and the use safety of the floors is even affected.

Therefore, the development of a novel assembled floor slab suitable for a steel structure is a great urgent need for the development of an assembled green building. The research and development of assembled floor slabs and the engineering world are concerned with the consistency. The invention provides an assembled light steel reinforced type one-way floor slab with a hollow steel bar truss concrete strip, which mainly comprises a reinforced concrete thin bottom plate, a hollow steel bar truss concrete strip and a light reinforced square steel pipe, and is an assembled floor slab structure with high assembly rate, convenient construction, good stress performance and wide application range.

Disclosure of Invention

The invention aims to solve the technical problem of providing an assembled light steel reinforced concrete strip laminated unidirectional floor slab with a hollow steel bar truss and a manufacturing method thereof, and the assembled light steel reinforced concrete strip laminated unidirectional floor slab has the advantages of high assembly rate, convenience in construction, good stress performance and wide application range.

In order to solve the technical problems, the invention adopts the following technical scheme:

an assembled light steel reinforced hollow steel truss concrete strip superposed unidirectional floor slab, comprising:

the concrete bottom plate is formed by casting concrete through a concrete bottom plate reinforcing steel bar net, and bolt holes of the concrete bottom plate are reserved during casting;

the concrete strip with the hollow reinforced truss is of a bending-resistant structure connected with the concrete bottom plate through the reinforced truss, and is composed of the concrete strip and the concrete strip pressed steel bars and the concrete strip step steel bars which are arranged in the concrete strip, wherein the concrete strip step steel bars and the concrete strip pressed steel bars are connected together, and concrete strip bolt holes are reserved in the concrete strip when concrete is poured; the upper part of the steel bar truss is welded with the concrete strip by pressed steel bars to form an upper chord of the steel bar truss, and the lower part of the steel bar truss is welded with a steel bar mesh of the concrete bottom plate to form a lower chord of the steel bar truss, so that the concrete bottom plate and the concrete strip are connected together;

the post-pouring area of the precast floor slab between the concrete strip with the hollow steel bar truss and the concrete bottom plate is a floor slab lamination layer, the area comprises the steel bar truss which is partially exposed and a lamination layer steel bar net of the lamination layer which is inserted in the area, concrete is poured into the floor slab lamination layer to form lamination layer post-pouring concrete, and the concrete bottom plate, the concrete strip with the hollow steel bar truss and the steel bar truss form a whole;

the light square steel pipe is in bending resistance and reinforcement structure, and a local reinforced round steel pipe is welded and connected in the light square steel pipe; the light square steel pipe and concrete strip connecting bolts penetrate through the local reinforced round steel pipe and the concrete strip bolt holes to connect the light square steel pipe and the concrete strip together;

floor leveling node, concrete bottom plate and square steel board connecting bolt pass through in proper order and transfer the bolt hole on the square steel plate and the concrete bottom plate bolt hole will transfer square steel plate with concrete bottom plate links together, screw up concrete bottom plate and square steel plate connecting bolt can be adjacent floor leveling.

Preferably, the concrete bottom plate reinforcing mesh is a reinforcing mesh formed by longitudinally distributed reinforcing bars and transversely distributed reinforcing bars, the longitudinally distributed reinforcing bars are positioned on the lower side, the transversely distributed reinforcing bars are positioned on the upper side, and the longitudinally distributed reinforcing bars positioned on the lower side of the concrete strip are welded with the steel bar trusses to form a lower chord member of the steel bar truss system; the longitudinally distributed steel bars welded with the steel bar truss in the steel bar mesh of the concrete bottom plate can be prestressed steel bars.

Preferably, the lower edge of the longitudinal distribution steel bars is 15mm away from the lower surface of the concrete bottom plate, and the diameters of the longitudinal distribution steel bars and the transverse distribution steel bars are 5mm.

Preferably, the concrete floor is a concrete sheet poured from a grade of C40 and above concrete having an aspect ratio greater than 2 and a thickness of no greater than 60mm.

Preferably, the concrete bottom plate bolt hole is a bolt hole reserved at the edge of the concrete bottom plate, the concrete bottom plate bolt hole is aligned with the bolt hole on the square adjustment steel plate, after the concrete bottom plate and the square steel plate are connected through bolts, the bolts are screwed, and the adjacent floor slabs can be leveled.

Preferably, the steel bar truss is a triangular truss steel bar structure formed by bending steel bars, the bending angle is 45 degrees, the wave crest at the upper part of the steel bar truss is welded and connected with the pressed steel bars of the concrete strips in the concrete strips, the concrete strip ladder lattice steel bars pass through the lower parts of the wave crests of the steel bar truss steel bars, the wave troughs at the lower parts of the steel bar truss steel bars are welded and connected with the longitudinally distributed steel bars of the concrete bottom plate steel bar net, and the transversely distributed steel bars of the concrete bottom plate steel bar net pass through the upper parts of the wave troughs of the steel bar truss steel bar net; the truss steel bars are perpendicular to the concrete bottom plate and the concrete strips.

Preferably, each concrete strip is welded and connected with a concrete bottom plate reinforcing mesh in the concrete bottom plate below through double rows of the steel bar trusses, and the distance between the double rows of the steel bar trusses is 160mm.

Preferably, the longitudinal steel bars of the superimposed layer steel bar mesh are positioned at the upper part, and the distance between the upper surface of the longitudinal steel bars and the lower surface of the concrete strip is 10mm; the transverse steel bars are positioned at the lower part, and the space between the lower surface of the transverse steel bars and the upper surface of the concrete bottom plate is 10mm; the longitudinal steel bars and the transverse steel bars of the laminated layer steel bar net extend out of the edge of the concrete bottom plate by 100mm and are respectively overlapped with the laminated layer steel bars of the adjacent floor slabs or the steel bars in the structural beam.

Preferably, the leveling square steel plate is a square steel plate with the length of 200mm multiplied by 5mm, bolt holes are symmetrically formed in the leveling square steel plate, the bolt holes on two sides are respectively aligned with the bolt holes of the concrete bottom plate of the adjacent floor slab, the leveling square steel plate is connected with the connecting bolts of the square steel plate through the concrete bottom plate, the contact surface of the leveling square steel plate and the adjacent two floor slabs is a plane, and the leveling square steel plate is arranged along the long side direction of the floor slab, and the distance is smaller than or equal to 1000mm.

The method for manufacturing the assembled light steel reinforced hollow steel truss concrete strip laminated unidirectional floor slab comprises the following steps of:

the first step: prefabricating a concrete bottom plate reinforcing steel bar net, concrete strip pressed reinforcing steel bars and concrete strip lattice reinforcing steel bars in a factory, prefabricating a steel bar truss, welding the steel bar truss with the concrete bottom plate reinforcing steel bar net and the concrete strip pressed reinforcing steel bars, pouring the concrete bottom plate and the concrete strip, and reserving concrete bottom plate bolt holes and concrete strip bolt holes to form a concrete strip superposed unidirectional floor slab with the hollow steel bar truss; prefabricating a light square steel pipe in a factory, perforating the light square steel pipe, and welding a local reinforced round steel pipe in the perforation;

and a second step of: transporting the prefabricated floor slab to the site, and installing the light square steel pipe on the concrete strip by using the light square steel pipe and the concrete strip connecting bolt on the ground, wherein the light square steel pipe can be lifted in place;

and a third step of: after a precast unidirectional floor slab with a hollow steel bar truss concrete strip with a light square steel tube is hoisted in place, connecting adjacent floor slabs by square adjustment steel plates through a concrete bottom plate and square steel plate connecting bolt, and leveling the floor slab by tightening the concrete bottom plate and square steel plate connecting bolt;

fourth step: penetrating the reinforcing steel bar net of the superposed layer into the superposed layer of the floor slab between the concrete bottom plate and the concrete strip, and overlapping reinforcing steel bars between adjacent floor slabs;

fifth step: pouring the post-pouring concrete of the superposed layer, wherein the surface of the post-pouring concrete of the superposed layer is flush with the surface of the concrete strip;

sixth step: and after the laminated layer concrete is cured for 7 days, unscrewing the light square steel pipe and concrete strip connecting bolts, unscrewing the concrete bottom plate and square steel plate connecting bolts, and plugging the concrete strip bolt holes and the concrete bottom plate bolt holes by adopting high-strength mortar.

Compared with the prior art, the invention has the following advantages:

(1) The technology of the steel bar truss and the concrete strip superimposed sheet solves five problems: firstly, the steel bar truss and the concrete strip are used as the pressed structure of the floor slab, so that the rigidity and the bending resistance of the floor slab are obviously improved, the arrangement of secondary beams is reduced, and the floor slab can be constructed without temporary supporting measures; secondly, the concrete bottom plate can be used as a permanent template of the floor slab, and the construction of the floor slab does not need to support or disassemble the template, so that the construction efficiency is improved; thirdly, the thickness of the concrete bottom plate is reduced, the dead weight of the precast floor slab is effectively reduced, and the prestressed high-strength steel wire is locally adopted in the bottom plate, so that the crack resistance of a tensile zone of the floor slab is improved; fourthly, the steel bar truss, the concrete compression strip and the concrete bottom plate form a space structure, and the bottom plate and the superposed layer are two-way reinforcement, so that the integrity of the floor slab is effectively improved; fifthly, the steel bar truss and the concrete strip superimposed sheet are beneficial to pipeline arrangement and convenient to decorate.

(2) The bending-resistant reinforced light square steel pipe technology solves three problems: firstly, the light square steel pipe strengthens the bending resistance of the floor slab during construction, reduces the thickness of the floor slab, increases the net height of the building, and ensures that the prefabricated floor slab is not only suitable for low-rise multi-storey residential buildings, but also can be used for high-rise and super high-rise buildings; secondly, the floor slab lifting installation is convenient, the light square steel pipe can be used as a hanging node for the floor slab lifting installation, the concentrated load during the traditional floor slab lifting is converted into a linear load, the lifting of the floor slab with a large area is facilitated, and the floor slab cracking can be effectively reduced; thirdly, the method has good economic benefit, the reinforcement amount of the floor slab is reduced, the light steel pipe is connected with the floor slab through bolts, and the light square steel pipe can be disassembled for recycling after the concrete pouring of the floor slab is completed and maintained for 7 days.

(3) The square adjusting steel plate solves the problem of difficult floor installation and leveling, and improves the construction efficiency and the construction quality.

Drawings

FIG. 1 is a schematic top view of a structure;

FIG. 2 isbase:Sub>A schematic view of the sectional A-A structure of FIG. 1;

FIG. 3 is a schematic view of the structure of FIG. 2 after casting of the laminate layer concrete;

FIG. 4 is a schematic view of the sectional structure B-B in FIG. 1;

FIG. 5 is a schematic view of the C-C cross-sectional structure of FIG. 1;

FIG. 6 is a schematic cross-sectional view of a leveling square steel plate after pouring of a laminated layer concrete;

FIG. 7 is a schematic view of the E-E cross-section structure of the laminated layer of FIG. 1 after casting;

in the figure: 1. a concrete floor; 2. a concrete bottom plate reinforcing mesh; 3. bolt holes of the concrete bottom plate; 4. steel bar truss; 5. a concrete strip; 6. the concrete strips are pressed with steel bars; 7. concrete strip ladder lattice steel bars; 8. concrete strip bolt holes; 9. light square steel pipes; 10. locally reinforcing the round steel pipe; 11. the light square steel tube is connected with the concrete strip through a bolt; 12. square adjusting steel plates; 13. the concrete bottom plate is connected with the square steel plate through bolts; 14. overlapping the layer of reinforcing steel bar net; 15. and pouring concrete after laminating.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

When designing and manufacturing the floor, firstly, determining the load of the floor according to the building design, designing the size of a concrete bottom plate and reinforcing bars according to the load of the floor, determining the size of a concrete compression strip of a hollow reinforced truss and the size of the reinforcing bars, checking the stress states of the floor in the construction stage and the actual use stage according to the designed section size and the material strength of the floor, and determining the size of a light steel pipe and the model of a connecting bolt; designing a floor leveling steel plate and distribution positions; according to the design scheme of the light steel reinforced concrete strip superposed unidirectional floor slab with the hollow steel truss and the assembly connection nodes thereof, a detailed structural construction drawing is drawn, and the prefabricated floor slab is manufactured, transported and assembled and constructed on site.

One embodiment of the invention is as follows:

as shown in fig. 1 to 7, the concrete floor 1 is a concrete sheet with a reinforcing mesh arranged inside, which is poured by concrete of grade C40 and above, and has an aspect ratio of more than 2 and a thickness of not more than 60mm, and is a standard concrete floor with a width of 1800mm, a length of 3600mm and a thickness of 50 mm. The reinforced concrete bottom plate is simply supported on the structural beam in the construction process, can be used as a construction platform, and can be used as a template when the laminated concrete of the floor slab is poured, and the reinforced concrete bottom plate and the laminated concrete form an integral and co-work after the pouring is completed. The concrete bottom plate 1 is formed by casting concrete through a concrete bottom plate reinforcing steel bar net 2, and concrete bottom plate bolt holes 3 are reserved during casting. The concrete bottom plate bolt holes 3 are reserved at the edge of the concrete bottom plate 1, the concrete bottom plate bolt holes 3 are aligned with bolt holes on the square adjustment steel plate 12, after passing through the concrete bottom plate and the square steel plate connecting bolts 13, the bolts are screwed, and the adjacent floor slabs can be leveled.

As shown in fig. 3 to 4, the concrete floor reinforcing mesh 2 is a reinforcing mesh composed of longitudinally distributed reinforcing bars and transversely distributed reinforcing bars, the longitudinally distributed reinforcing bars being located at the lower side, and the transversely distributed reinforcing bars being located at the upper side. The longitudinally distributed steel bars located on the underside of the concrete strips 5 are welded with the steel bar trusses 4 to form the lower chords of the steel bar truss system. The longitudinally distributed steel bars welded with the steel bar truss 4 in the steel bar net 2 of the concrete bottom plate can adopt prestressed steel bars. Wherein, the lower edge of the longitudinal distribution steel bars is 15mm away from the lower surface of the concrete bottom plate 1, and the diameters of the longitudinal distribution steel bars and the transverse distribution steel bars are 5mm.

The hollow steel bar truss concrete strip is a bending-resistant structure connected with the concrete bottom plate 1 through a steel bar truss 4, and is composed of a concrete strip 5, concrete strip compression steel bars 6 and concrete strip ladder lattice steel bars 7 which are arranged in the concrete strip 5. The concrete strip 5 is a 40mm high, 200mm wide reinforced concrete compression layer poured from a grade of C40 and above concrete. A floor slab overlapping layer with a spacing of 30mm exists between the lower surface of the concrete strip 5 and the upper surface of the bottom plate of the concrete bottom plate 1, and the overlapping layer can pass through the steel bars. The spacing between adjacent concrete strips 5 is not more than 1000mm. And concrete strip bolt holes 8 are reserved on the concrete strips 5.

The concrete strip ladder bars 7 are connected with the concrete strip pressed bars 6, and concrete strip bolt holes 8 are reserved in the concrete strips 5 when concrete is poured. The concrete strip pressed steel bars 6 are longitudinal pressed steel bars with the diameter of 12mm inside the concrete strips 5, and 2 concrete strip pressed steel bars 6 are symmetrically arranged in each concrete strip 5. The concrete strip step steel bars 7 are steel bar sections with the diameter of 5mm of the tie concrete strip pressed steel bars 6, are welded with the concrete strip pressed steel bars 6, and the driving distance of the concrete strip step steel bars 7 is 300mm. The distance between the bolt holes 8 of the concrete strips is not more than 600mm, and the bolts 11 are connected with the concrete strips through the light square steel pipes and the concrete strips, so as to connect the concrete strips 5 with the light square steel pipes 9.

The upper part of the steel bar truss 4 is welded with the concrete strip pressed steel bars 6 to form an upper chord of the steel bar truss 4, and the lower part of the steel bar truss 4 is welded with the concrete bottom plate steel bar net 2 to form a lower chord of the steel bar truss 4, so that the concrete bottom plate 1 and the concrete strips 5 are connected together. The steel bar truss 4 is a triangular truss steel bar structure formed by bending steel bars with the diameter of 5mm, the bending angle is 45 degrees, the wave crest at the upper part of the steel bar truss 4 is welded and connected with the concrete strip pressed steel bars 6 in the concrete strip 5, the concrete strip ladder lattice steel bars 7 penetrate through the lower parts of the wave crests, the wave troughs at the lower parts of the steel bar ladder lattice steel bars are welded and connected with the longitudinal distribution steel bars of the concrete bottom plate steel bar net 2, and the transverse distribution steel bars of the concrete bottom plate steel bar net 2 penetrate through the upper parts of the wave troughs; truss steel bars 4 are arranged perpendicular to the concrete floor 1 and the concrete strips 5. Each concrete strip 5 is welded with the concrete bottom plate reinforcing mesh 2 in the concrete bottom plate 1 below through double-row reinforcing trusses 4, and the distance between the double-row reinforcing trusses 4 is 160mm. The longitudinal steel bars welded with the steel bar truss 4 in the steel bar net 2 of the concrete bottom plate can be prestressed steel bars so as to enhance the bending resistance of the wallboard, and the rest parts can be high-strength stress-relieving steel bars.

The post-cast area of the precast floor slab between the hollow steel bar truss concrete strip and the concrete bottom plate 1 is a floor slab laminated layer structure, and the area comprises the steel bar truss 4 which is partially exposed and a laminated layer steel bar net 14 which is inserted in the area. And pouring concrete into the floor slab overlapping layers to form overlapping layers, and then pouring concrete 15, so that the concrete bottom plate 1, the concrete strips with the hollow steel bar trusses and the steel bar trusses 4 are integrated. The post-lamination concrete 15 is concrete with a strength grade not lower than C40, and the post-lamination concrete 15 connects the concrete floor 1 and the concrete strip 5 integrally, with the upper surface thereof being flush with the upper surface of the concrete strip 5.

Wherein the superimposed reinforcing mesh 14 is composed of reinforcing bars having a diameter of 5mm. The longitudinal steel bars of the superimposed layer reinforcing mesh 14 are positioned at the upper part, and the distance between the upper surface of the longitudinal steel bars and the lower surface of the concrete strip 5 is 10mm; the transverse steel bars are positioned at the lower part, and the space between the lower surface of the transverse steel bars and the upper surface of the concrete bottom plate 1 is 10mm; the longitudinal steel bars and the transverse steel bars of the laminated steel bar net 14 extend out of the edge of the concrete bottom plate 1 by 100mm and are respectively overlapped with the laminated steel bars of the adjacent floor slabs or the steel bars in the structural beams.

A local reinforced round steel pipe 10 is welded and connected to the inside of a light square steel pipe 9. The light square steel pipe and concrete strip connecting bolts 11 pass through the local reinforced round steel pipe 10 and the concrete strip bolt holes 8 to connect the light square steel pipe 9 with the concrete strip 5. The light square steel pipe 9 is a square steel pipe with the length of 80mm multiplied by 4mm, and the main function is to strengthen the bending resistance of the floor slab. The light square steel pipe 9 and the concrete strip 5 are connected by adopting a light square steel pipe and a concrete strip connecting bolt 11. And after the construction of the concrete lamination layer is completed and the concrete lamination layer is maintained for 7 days, the light square steel pipe 9 is removed, and the light square steel pipe 9 can be recycled. The light square steel pipe 9 can also be used as a floor lifting device to prevent the floor damage caused by the concentrated load of the hanging. The local reinforced round steel pipe 10 is a round steel pipe with the inner diameter of 14mm and the thickness of 3mm, is welded at the opening of the light square steel pipe 9, strengthens the out-of-plane local compressive capacity of the steel pipe wall at the opening, and prevents the steel pipe wall from buckling in the screwing process of the light square steel pipe and the concrete strip connecting bolt 11. The light square steel pipe and concrete strip connecting bolts 11 are M12 high-strength bolts which penetrate through the local reinforced round steel pipes 10 on the light square steel pipes 9 and the concrete strip bolt holes 8 to connect the light square steel pipes 9 with the concrete strips 5, and the distance between the light square steel pipes and the concrete strips is not more than 600mm. In the process of bolting, the end of the screw rod is required to pass through the light square steel pipe 9 and the concrete strip 5 for the next time, after the nut on the lower surface of the concrete strip 5 is screwed, the exposed length of the nut of the light square steel pipe and concrete strip connecting bolt 11 is required to be within 5mm, after the concrete pouring and curing of the laminated layer are completed, the screw rod is screwed out to remove the light square steel pipe 9, and the concrete strip bolt hole 8 is blocked by adopting high-strength mortar.

And the floor leveling nodes, the concrete bottom plate and the square steel plate connecting bolts 13 sequentially penetrate through the bolt holes in the square adjusting steel plate 12 and the concrete bottom plate bolt holes 3 to connect the square adjusting steel plate 12 with the concrete bottom plate 1, and the adjacent floor can be leveled by screwing the concrete bottom plate and the square steel plate connecting bolts 13. The leveling square steel plate 12 is a square steel plate with the length of 200mm multiplied by 5mm, 4 bolt holes are symmetrically formed in the leveling square steel plate, the bolt holes on two sides are respectively aligned with the bolt holes 3 of the concrete bottom plate of the adjacent floor slab, the leveling square steel plate 12 is positioned at the bottom of the floor slab and is connected with the connecting bolts 13 of the square steel plate, the contact surface of the leveling square steel plate 12 and the adjacent two floor slabs is a plane, the leveling square steel plate 12 is arranged along the long side direction of the floor slab, and the distance is smaller than or equal to 1000mm. And after the floor slab is poured with the laminated layer concrete and maintained for 7 days, the square adjusting steel plate 12 can be detached and used repeatedly. The concrete bottom plate and square steel plate connecting bolts 13 are M12 high-strength bolts which penetrate upwards at the bottom of the leveling square steel plate 12, pass through the leveling square steel plate 12 and the concrete bottom plate 1 in sequence, are screwed on the upper surface of the concrete bottom plate 1 by nuts, and the nuts are exposed out of the nuts by no more than 5mm. After pouring the bottom layer concrete and curing for 7 days, the concrete bottom plate and the square steel plate connecting bolts 13 can be screwed out, and the concrete bottom plate bolt holes 3 are sealed by adopting high-strength mortar.

The method for manufacturing the assembled light steel reinforced concrete strip laminated unidirectional floor slab with the hollow steel bar truss comprises the following steps of:

the first step: prefabricating a concrete bottom plate reinforcing steel bar net 2, concrete strip pressed reinforcing steel bars 6 and concrete strip step grid reinforcing steel bars 7 in a factory, prefabricating a steel bar truss 4, welding the steel bar truss 4 with the concrete bottom plate reinforcing steel bar net 2 and the concrete strip pressed reinforcing steel bars 6, pouring the concrete bottom plate 1 and the concrete strips 5, and reserving concrete bottom plate bolt holes 3 and concrete strip bolt holes 8 to form a concrete strip superposed unidirectional floor slab with a hollow steel bar truss; prefabricating a light square steel pipe 9 in a factory, perforating the light square steel pipe 9 and welding a local reinforced round steel pipe 10 in the perforation;

and a second step of: the prefabricated floor slab is transported to the site, and the light square steel pipe 9 is installed on the concrete strips 5 by the light square steel pipe and concrete strip connecting bolts 11 on the ground so as to be hoisted in place;

and a third step of: after a precast unidirectional floor slab with a hollow steel bar truss concrete strip superposition with a light square steel pipe 9 is hoisted in place, connecting adjacent floor slabs by using a concrete bottom plate and square steel plate connecting bolt 13 through a square adjustment steel plate 12, and leveling the floor slab by tightening the concrete bottom plate and square steel plate connecting bolt 13;

fourth step: penetrating the superimposed reinforcing steel bar net 14 into the superimposed layer of the floor slab between the concrete bottom plate 1 and the concrete strip 5, and overlapping reinforcing steel bars between adjacent floor slabs;

fifth step: pouring the post-pouring concrete 15 of the superposed layer, wherein the surface of the post-pouring concrete 15 of the superposed layer is flush with the surface of the concrete strip 5;

sixth step: after the laminated layer concrete is cured for 7 days, the light square steel pipe and concrete strip connecting bolts 11 are unscrewed, the concrete bottom plate and square steel plate connecting bolts 13 are unscrewed, and the concrete strip bolt holes 8 and the concrete bottom plate bolt holes 3 are plugged by adopting high-strength mortar.

The present invention is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present invention and the inventive concept thereof, can be replaced or changed within the scope of the present invention.

Claims (10)

1. An assembled light steel reinforced concrete strip laminated unidirectional floor slab with a hollow steel truss, which is characterized by comprising the following components:

the concrete bottom plate (1) is formed by casting concrete through a concrete bottom plate reinforcing mesh (2), and concrete bottom plate bolt holes (3) are reserved during casting;

the concrete strip with the hollow steel bar truss is of a bending-resistant structure connected with the concrete bottom plate (1) through the steel bar truss (4), and is composed of a concrete strip (5) and concrete strip pressed steel bars (6) and concrete strip step steel bars (7) which are arranged in the concrete strip, wherein the concrete strip step steel bars (7) are connected with the concrete strip pressed steel bars (6), and concrete strip bolt holes (8) are reserved in the concrete strip (5) when concrete is poured; the upper part of the steel bar truss (4) is welded with the concrete strip pressed steel bars (6) to form an upper chord of the steel bar truss (4), and the lower part of the steel bar truss (4) is welded with the concrete bottom plate steel bar mesh (2) to form a lower chord of the steel bar truss (4), so that the concrete bottom plate (1) and the concrete strip (5) are connected together;

the precast floor slab is in a floor slab laminated layer structure, a post-pouring area between the concrete strip with the hollow steel bar truss and the concrete bottom plate (1) is a floor slab laminated layer, the area comprises the steel bar truss (4) which is partially exposed and a laminated layer steel bar net (14) which is inserted in the area, concrete is poured into the laminated layer of the floor slab to form laminated layer post-pouring concrete (15), and the concrete bottom plate (1), the concrete strip with the hollow steel bar truss and the steel bar truss (4) are formed into a whole;

the light square steel pipe bending resistance reinforcing structure is characterized in that a local reinforcing round steel pipe (10) is welded and connected in the light square steel pipe (9); the light square steel pipe and concrete strip connecting bolts (11) penetrate through the local reinforced round steel pipe (10) and the concrete strip bolt holes (8) to connect the light square steel pipe (9) with the concrete strip (5);

floor leveling node, concrete bottom plate and square steel board connecting bolt (13) pass through in proper order and transfer the bolt hole on square steel sheet (12) and concrete bottom plate bolt hole (3) will leveling square steel sheet (12) with concrete bottom plate (1) link together, screw up concrete bottom plate and square steel board connecting bolt (13) can be adjacent floor leveling.

2. The assembled light steel reinforced concrete strip laminated unidirectional floor slab with hollow steel trusses, as claimed in claim 1, characterized in that the concrete bottom plate steel reinforcement mesh (2) is a steel reinforcement mesh composed of longitudinally distributed steel bars and transversely distributed steel bars, the longitudinally distributed steel bars are positioned at the lower side, the transversely distributed steel bars are positioned at the upper side, and the longitudinally distributed steel bars positioned at the lower side of the concrete strips (5) are welded with the steel trusses (4) to form lower chords of a steel truss system; the longitudinal distributed steel bars welded with the steel bar truss (4) in the steel bar mesh (2) of the concrete bottom plate can be prestressed steel bars.

3. An assembled light steel reinforced concrete strip laminated unidirectional floor with hollow steel trusses, as claimed in claim 2, characterized in that the lower edges of the longitudinally distributed steel bars are 15mm from the lower surface of the concrete floor (1), and the diameters of the longitudinally distributed steel bars and the transversely distributed steel bars are 5mm.

4. The fabricated light steel reinforced concrete strip composite unidirectional floor slab with hollow steel trusses, as claimed in claim 1, wherein the concrete bottom plate (1) is a concrete sheet with an aspect ratio of greater than 2 and a thickness of not greater than 60mm poured from C40 and above grade concrete.

5. The assembled light steel reinforced concrete strip laminated unidirectional floor slab with the hollow steel truss, as claimed in claim 1, wherein the concrete bottom plate bolt holes (3) are reserved at the edge of the concrete bottom plate (1), the concrete bottom plate bolt holes (3) are aligned with bolt holes on the square adjusting steel plate (12), and after passing through the concrete bottom plate and the square steel plate connecting bolts (13), the bolts are screwed, so that the adjacent floor slabs can be leveled.

6. The assembled light steel reinforced concrete strip laminated unidirectional floor slab with hollow steel trusses, as claimed in claim 2, characterized in that the steel trusses (4) are triangular truss steel bar structures with steel bars bent at an angle of 45 degrees, the peaks at the upper parts of the steel trusses are welded with the concrete strip pressed steel bars (6) in the concrete strips (5), the concrete strip ladder bars (7) pass through the lower parts of the peaks, the troughs at the lower parts of the steel trusses are welded with the longitudinally distributed steel bars of the concrete bottom plate steel bar net (2), and the transversely distributed steel bars of the concrete bottom plate steel bar net (2) pass through the upper parts of the troughs of the steel trusses; the truss steel bar (4) is perpendicular to the concrete bottom plate (1) and the concrete strip (5).

7. The assembled light steel reinforced concrete strip laminated unidirectional floor slab with hollow steel trusses, as claimed in claim 6, characterized in that each concrete strip (5) is welded with the concrete floor steel mesh (2) in the concrete floor (1) below by double rows of steel trusses (4), and the distance between the double rows of steel trusses (4) is 160mm.

8. The fabricated light steel reinforced concrete strip composite unidirectional floor slab with open web steel trusses according to claim 1, characterized in that the longitudinal steel bars of the composite layer steel mesh (14) are located at the upper part, and the distance between the upper surface and the lower surface of the concrete strip (5) is 10mm; the transverse steel bars are positioned at the lower part, and the space between the lower surface of the transverse steel bars and the upper surface of the concrete bottom plate (1) is 10mm; the longitudinal steel bars and the transverse steel bars of the laminated steel bar meshes (14) extend out of the edge of the concrete bottom plate (1) by 100mm and are respectively overlapped with the laminated steel bars of the adjacent floor slabs or the steel bars in the structural beams.

9. The assembled light steel reinforced concrete strip laminated unidirectional floor slab with the hollow steel trusses, as claimed in claim 1, characterized in that the leveling square steel plates (12) are square steel plates with the length of 200mm multiplied by 5mm, 4 bolt holes are symmetrically formed in the leveling square steel plates, the bolt holes on two sides are respectively aligned with the bolt holes (3) of the concrete bottom plate of the adjacent floor slab, the leveling square steel plates (12) are positioned at the bottom of the floor slab and are in plane contact with the adjacent two floor slabs, and the leveling square steel plates (12) are arranged along the length direction of the floor slab and have a distance of less than or equal to 1000mm.

10. The method for manufacturing the assembled light steel reinforced hollow steel truss concrete strip laminated unidirectional floor slab is characterized by comprising the following steps of:

the first step: prefabricating a concrete bottom plate reinforcing steel bar net (2), concrete strip pressed reinforcing steel bars (6) and concrete strip lattice reinforcing steel bars (7) in a factory, prefabricating a steel bar truss (4), welding the steel bar truss (4) with the concrete bottom plate reinforcing steel bar net (2) and the concrete strip pressed reinforcing steel bars (6), pouring the concrete bottom plate (1) and the concrete strips (5), reserving concrete bottom plate bolt holes (3) and concrete strip bolt holes (8), and forming a concrete strip superposed unidirectional floor slab with the hollow steel bar truss; prefabricating a light square steel pipe (9) in a factory, perforating the light square steel pipe (9) and welding a local reinforced round steel pipe (10) in the perforation;

and a second step of: transporting the prefabricated floor slab to the site, and installing the light square steel pipe (9) on the concrete strip (5) on the ground by using the light square steel pipe and concrete strip connecting bolts (11), wherein the light square steel pipe can be lifted in place;

and a third step of: after a precast unidirectional floor slab with a hollow steel bar truss concrete strip superposition with a light square steel pipe (9) is hoisted in place, connecting the adjacent floor slab with a square steel plate (12) by using a concrete bottom plate and a square steel plate connecting bolt (13), and leveling the floor slab by screwing the concrete bottom plate and the square steel plate connecting bolt (13);

fourth step: penetrating a reinforcing steel bar net (14) of the superposed layer into a floor superposed layer between a concrete bottom plate (1) and a concrete strip (5), and overlapping reinforcing steel bars between adjacent floors;

fifth step: pouring the post-pouring concrete (15) of the superposed layer, wherein the surface of the post-pouring concrete (15) of the superposed layer is flush with the surface of the concrete strip (5);

sixth step: after the laminated layer concrete is cured for 7 days, the light square steel pipe and the concrete strip connecting bolts (11) are unscrewed, the concrete bottom plate and the square steel plate connecting bolts (13) are unscrewed, and the concrete strip bolt holes (8) and the concrete bottom plate bolt holes (3) are plugged by adopting high-strength mortar.

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