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

A prefabricated light-steel-reinforced trussed concrete strip laminated unidirectional floor slab and its method

technical field

The invention belongs to the technical field of prefabricated building structure engineering, and more specifically relates to a prefabricated light steel reinforced truss concrete strip superimposed one-way floor slab and its method.

Background technique

It is an important way to realize the industrialization of construction by developing prefabricated buildings and promoting the R&D and innovation of new prefabricated components and assembly technology. Prefabricated steel structures have been maturely used in industrial and civil construction fields, such as stadiums, factory workshops, and large-span exhibition halls, due to their advantages of high standardization, fast construction speed, and good seismic performance. The effect of popularization and application in residential buildings is still unsatisfactory. One of the important reasons is the lack of a floor system with high assembly rate, convenient construction, and high-efficiency stress that matches the prefabricated steel structure residence. The traditional cast-in-place floor has a long construction period. , Seriously affecting the advantages of rapid construction of steel structures.

For traditional prefabricated slabs or semi-prefabricated slabs, one-way slabs have weak bending resistance. Take reinforced truss floor deck and truss reinforced concrete laminated floor as an example: when there is no temporary support, the self-weight, concrete weight and construction live load of the prefabricated slab are all borne by the prefabricated slab during the construction stage; When the design value has not been reached, the load mainly includes the self-weight of the steel truss, the self-weight of the prefabricated layer, the self-weight of the laminated layer and the construction live load, all of which are borne by the steel truss and the prefabricated slab. If temporary supports such as scaffolding are set up, the construction period will be extended and the construction space under the floor will be occupied, which is not conducive to the rapid assembly construction of the steel structure.

Traditional prefabricated floor slabs are heavy and difficult to transport and hoist. In order to improve the bending resistance of traditional prefabricated slabs during construction, the concrete layer of the bottom slab is relatively thick, which increases the self-weight of the slab, and cracks are likely to occur due to concentrated loads and dynamic loads during transportation and hoisting.

Traditional prefabricated floor slabs are thick and poor in integrity. For example, the profiled steel plate composite floor slab commonly used in prefabricated steel structures currently has a high bottom slab rib height, which limits the thickness of the upper plate and the net height of the building, so it is not suitable for use in high-rise and super high-rise buildings. The two-way rigidity is inconsistent, and the seismic performance in the direction perpendicular to the slab rib is weak.

The cost of traditional prefabricated floor slabs is high and the economic benefits are low. For example, the combined floor slab of profiled steel plate and the composite floor slab of reinforced truss floor deck adopt galvanized steel plate as the formwork, which is expensive and not easy to recycle after disassembly.

The installation of traditional prefabricated prefabricated slabs is difficult, and it is difficult to connect and level adjacent slabs. In the process of prefabricated construction, limited by component manufacturing errors and hoisting accuracy, problems such as dislocation of adjacent floors or unevenness of the bottom of the slab are common. If the dislocation is large, problems such as concrete leakage and lack of compaction will occur, which will cause water leakage or even Affect the safety of the floor.

Therefore, the development of new prefabricated floor slabs suitable for steel structures is a major and urgent need for the development of prefabricated green buildings. The research and development of prefabricated floor slabs has attracted unanimous attention from the engineering community. The present invention proposes a prefabricated light-steel-reinforced concrete strip superimposed unidirectional floor slab with hollow steel bar truss, which is mainly composed of reinforced concrete thin bottom plate, hollow steel bar truss concrete strip and light reinforced square steel pipe, which is a high assembly rate It is a prefabricated floor structure with convenient construction, good mechanical performance and wide application range.

Contents of the invention

The technical problem to be solved by the present invention is to provide an assembled light-steel-reinforced concrete strip laminated unidirectional floor slab with vierendeel reinforced truss and its method, which has high assembly rate, convenient construction, good mechanical performance and wide application range.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A prefabricated light-steel-reinforced concrete strip superimposed one-way floor slab with vierendeel reinforced trusses, including:

The concrete floor is formed by pouring concrete from the steel mesh of the concrete floor, and the bolt holes of the concrete floor are reserved during pouring;

The concrete strip with hollow steel truss is a bending-resistant structure connected to the concrete bottom plate through a steel truss, and is composed of a concrete strip and the concrete strip compression steel bars and concrete strip ladder bars arranged inside the concrete strip. The strip ladder grid steel bar and the concrete strip compression steel bar are connected together, and the concrete strip bolt holes are reserved in the concrete strip when pouring concrete; the upper part of the steel bar truss is welded to the concrete strip compression steel bar Forming the upper chord of the steel bar truss, the lower part of the steel bar truss is welded with the concrete floor reinforcement mesh to form the lower chord of the steel bar truss, thereby connecting the concrete floor and the concrete strip together;

Floor laminated layer structure, the post-casting area of the prefabricated floor between the concrete strip with hollow steel truss and the concrete bottom plate is the floor laminated layer, this area includes the partially exposed steel truss, and the laminated truss interspersed therein The laminated layer reinforcement mesh of the laminated layer, pouring concrete into the laminated layer of the floor to form the laminated layer, so that the concrete bottom plate, the concrete strip with hollow steel truss and the reinforced truss form a whole;

Light square steel pipe anti-bending reinforcement structure, welding and connecting locally reinforced round steel pipes inside the light square steel pipe; the light square steel pipe and the concrete strip connecting bolt pass through the locally reinforced round steel pipe and the concrete strip bolt hole to connect the The light square steel pipe is connected together with the concrete strip;

Floor leveling node, the connecting bolts between the concrete bottom plate and the square steel plate pass through the bolt holes on the leveling steel plate and the bolt holes of the concrete bottom plate in turn to connect the leveling square steel plate and the concrete bottom plate, and tighten the concrete bottom plate and the concrete bottom plate Square steel connecting bolts allow leveling of adjacent slabs.

Preferably, the reinforced mesh of the concrete floor is a reinforced mesh composed of longitudinally distributed reinforcing bars and transversely distributed reinforcing bars, the longitudinally distributed reinforcing bars are located on the lower side, the transversely distributed reinforcing bars are located on the upper side, and are located under the concrete strip The longitudinally distributed steel bars on the side are welded with the steel bar truss to form the lower chord of the steel bar truss system; the longitudinally distributed steel bars welded with the steel bar truss in the concrete floor reinforcement mesh can be prestressed steel bars.

Preferably, the lower edge of the longitudinally distributed steel bars is 15 mm from the lower surface of the concrete floor, and the diameters of the longitudinally distributed steel bars and the transversely distributed steel bars are both 5 mm.

Preferably, the concrete bottom slab is a thin concrete slab with an aspect ratio greater than 2 and a thickness not greater than 60mm poured from C40 and above grade concrete.

Preferably, the concrete bottom plate bolt holes are bolt holes reserved on the edge of the concrete bottom plate, the concrete bottom plate bolt holes are aligned with the bolt holes on the leveling square steel plate, and after passing through the concrete bottom plate and the square steel plate to connect the bolts, By tightening the bolts, the adjacent slabs can be leveled.

Preferably, the steel bar truss is a triangular truss steel bar structure after the steel bar is bent, the bending angle is 45°, and the crest on the upper part thereof is welded and connected with the concrete strip compression steel bars in the concrete strip, so that The concrete strip ladder bars pass through the lower part of the crest, and the lower part of the trough is welded to the longitudinally distributed reinforcing bars of the concrete floor reinforcing mesh, and the transversely distributed reinforcing bars of the concrete floor reinforcing mesh are in the upper part of the trough passing through; the truss reinforcement is perpendicular to the concrete floor and the concrete strip.

Preferably, each of the concrete strips is welded and connected to the concrete bottom slab reinforcement mesh in the concrete bottom slab below by means of double rows of steel trusses, and the distance between the two rows of steel trusses is 160mm.

Preferably, the longitudinal steel bar of the laminated layer steel mesh is located at the upper part, and the distance between its upper surface and the lower surface of the concrete strip is 10 mm; the transverse steel bar is located at the lower part, and the distance between its lower surface and the upper surface of the concrete floor is 10mm; the longitudinal reinforcement and transverse reinforcement of the superimposed layer reinforcement mesh all protrude from the edge of the concrete floor by 100mm, and are respectively overlapped with the superimposed layer reinforcement of the adjacent floor slab or the reinforcement in the structural beam.

Preferably, the leveling square steel plate is a square steel plate of 200mm×200mm×5mm, and a bolt hole is symmetrically opened on it, and the bolt holes on both sides are respectively aligned with the bolt holes of the concrete bottom plate of the adjacent floor slab, through which the concrete bottom plate and the square The steel plates are connected by connecting bolts. The leveling square steel plate is located at the bottom of the floor, and the contact surface with two adjacent floors is a plane. The leveling square steel plate is arranged along the long side of the floor, and the spacing is less than or equal to 1000mm.

A method for superimposing one-way floor slabs with prefabricated light-steel-reinforced concrete strips with vierendeel reinforced trusses, comprising the following steps:

The first step: factory prefabricated concrete bottom slab steel mesh, concrete strip compression steel bars and concrete strip ladder grid steel bars, prefabricated steel trusses, welded the steel trusses to the concrete bottom slab steel mesh and concrete strip compression steel bars, poured concrete bottom slabs and Concrete strips, and reserve the bolt holes of the concrete bottom plate and the concrete strip bolts to form a one-way floor slab laminated with hollow steel truss concrete strips; the factory prefabricated light square steel pipes, opened holes on the light square steel pipes and welded in the holes Partially reinforced round steel pipes;

Step 2: Transport the prefabricated floor slab to the site, install the light square steel pipe to the concrete strip with bolts connecting the light square steel pipe and the concrete strip on the ground, and then lift it into place;

Step 3: After the superimposed prefabricated one-way floor slab with empty-web steel truss with light square steel pipe is hoisted in place, use the connecting bolts between the concrete bottom slab and the square steel plate to connect the adjacent floor slabs through the leveling square steel plate, and tighten the concrete bottom slab Connect the bolts with the square steel plate to level the floor;

Step 4: Penetrate the superimposed layer reinforcement mesh into the laminated floor between the concrete floor and the concrete strip, and overlap the reinforcement between adjacent floors;

Step 5: Pour concrete after pouring the laminated layer, and the surface of the post-cast concrete of the laminated layer is flush with the surface of the concrete strip;

Step 6: After curing the composite layer concrete for 7 days, unscrew the connecting bolts between the light square steel pipe and the concrete strip, unscrew the connecting bolts between the concrete bottom plate and the square steel plate, and use high-strength mortar to seal the bolt holes of the concrete strip and the concrete bottom plate Bolt hole.

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

(1) The steel truss and concrete strip composite slab technology solves five major problems: First, the steel truss and concrete strip are used as the compression structure of the floor, which significantly improves the stiffness and bending resistance of the floor, reduces the layout of secondary beams, and makes the The floor slab can be constructed without temporary support measures; second, the concrete floor can be used as a permanent formwork for the floor, and the floor construction does not require formwork or formwork removal, which improves construction efficiency; third, the thickness of the concrete floor is reduced, which effectively reduces the burden on the prefabricated floor. Self-weight, prestressed high-strength steel wires are used locally in the bottom slab, which improves the crack resistance in the tension area of the floor slab; Fourth, the steel trusses, concrete compression strips and concrete bottom slab form a spatial structure, and the bottom slab and laminated layers are two-way Reinforcement effectively improves the integrity of the floor slab; fifthly, steel trusses and concrete strip laminates are conducive to the layout of pipelines and are convenient for decoration.

(2) The anti-bending strengthened light square steel pipe technology solves three major problems: First, the light square steel pipe strengthens the bending resistance of the floor during construction, reduces the thickness of the floor, and increases the net height of the building, making the prefabricated floor not only suitable for In low-rise residential buildings, it can also be used in high-rise and super high-rise buildings; secondly, it is convenient for floor slab hoisting and installation. Light square steel pipes can be used as the hanging node of floor slab hoisting and installation, and the concentrated load during traditional floor slab hoisting is converted into line load. It is conducive to the hoisting of large-area floors and can effectively reduce floor cracking; third, it has good economic benefits and reduces the amount of reinforcement in the floor, and the light steel pipes are connected to the floor through bolts. After the floor concrete is poured and maintained for 7 days, the light The square steel pipe can be disassembled and recycled.

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

Description of drawings

Fig. 1 is a schematic diagram of a top view structure;

Fig. 2 is a schematic diagram of the A-A sectional structure in Fig. 1;

Fig. 3 is the schematic diagram of the structure after pouring the laminated layer concrete in Fig. 2;

Fig. 4 is the B-B sectional structure schematic diagram in Fig. 1;

Fig. 5 is a schematic diagram of the C-C sectional structure in Fig. 1;

Fig. 6 is a schematic diagram of the cross-sectional structure at the leveling steel plate after the concrete pouring of the laminated layer;

Fig. 7 is the E-E cross-sectional structure schematic diagram after the superimposed layer concrete pouring in Fig. 1;

In the figure: 1. Concrete floor; 2. Concrete floor reinforcement mesh; 3. Bolt holes in concrete floor; 4. Steel bar truss; 5. Concrete strip; 6. Concrete strip compression reinforcement; 7. Concrete strip ladder lattice reinforcement ;8. Concrete strip bolt holes; 9. Light square steel pipe; 10. Locally reinforced round steel pipe; 11. Light square steel pipe and concrete strip connection bolts; 12. Leveling square steel plate; 13. Concrete floor and square steel plate connection bolts; 14. Laminated layer steel mesh; 15. Concrete poured after the laminated layer.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

When designing and manufacturing the floor slab, first determine the floor load according to the architectural design, design the size and reinforcement of the concrete floor according to the floor load, determine the size and reinforcement of the concrete compression strip of the hollow steel truss, and construct the floor according to the designed floor section size and material strength. Check and calculate the stress state of the stage and the actual use stage, determine the size of the light steel pipe and the type of the connecting bolt; design the leveling steel plate and the distribution position of the floor; laminate the one-way floor and its assembly according to the light steel reinforced concrete strips with vierendeel reinforced trusses Design schemes for connection nodes, draw detailed structural drawings, and carry out prefabricated floor slab fabrication, transportation and on-site assembly construction.

A specific embodiment of the present invention is as follows:

As shown in Figure 1-7, the concrete bottom slab 1 is a thin concrete slab with a width of 1800mm, a length of 3600mm, and a thickness of 50mm, which is poured from C40 and above grade concrete with an aspect ratio greater than 2 and a thickness of no more than 60mm. Standard concrete floor. During the construction process, the reinforced concrete bottom slab is simply supported on the structural beam, which can be used as a construction platform, and can be used as a formwork when pouring the laminated concrete of the floor slab. After the pouring is completed, it will work together with the laminated concrete as a whole. The concrete bottom slab 1 is formed by pouring concrete from the concrete bottom slab reinforcement mesh 2, and the concrete bottom slab bolt holes 3 are reserved during pouring. Wherein, the concrete bottom plate bolt hole 3 is a bolt hole reserved on the edge of the concrete bottom plate 1, the concrete bottom plate bolt hole 3 is aligned with the bolt hole on the leveling square steel plate 12, after passing through the concrete bottom plate and the square steel plate to connect the bolt 13, tighten the bolt , to level adjacent floors.

As shown in Figure 3-4, the reinforcement mesh 2 for the concrete floor is a reinforcement mesh composed of longitudinally distributed reinforcement and laterally distributed reinforcement, the longitudinally distributed reinforcement is located on the lower side, and the horizontally distributed reinforcement is located on the upper side. The longitudinally distributed steel bars on the lower side of the concrete strip 5 are welded with the steel bar truss 4 to form the lower chord of the steel bar truss system. The longitudinally distributed reinforcement welded with the reinforcement truss 4 in the concrete floor reinforcement mesh 2 can be prestressed reinforcement. Wherein, the lower edge of the longitudinally distributed reinforcing bars is 15 mm away from the lower surface of the concrete floor 1, and the diameters of the longitudinally distributed reinforcing bars and the transversely distributed reinforcing bars are both 5 mm.

The concrete strip with hollow steel truss is a bending-resistant structure connected to the concrete bottom plate 1 through the steel truss 4. The concrete strip 5 and the concrete strip compression steel bars 6 and the concrete strip ladder bars 7 arranged inside constitute. Concrete strip 5 is a 40mm high and 200mm wide reinforced concrete compression layer poured with C40 and above grade concrete. Between the lower surface of the concrete strip 5 and the upper surface of the bottom plate of the concrete base 1 there is a floor laminated layer with a spacing of 30mm, and the laminated layer can pass through the steel bars. The distance between adjacent concrete strips 5 is not greater than 1000mm. Concrete strip bolt holes 8 are reserved on the concrete strip 5 .

The concrete strip ladder bars 7 and the concrete strip compression steel bars 6 are connected together, and the concrete strip bolt holes 8 are reserved in the concrete strip 5 when pouring concrete. The concrete strip compression reinforcement 6 is a longitudinal compression reinforcement with a diameter of 12mm inside the concrete strip 5 , and two concrete strip compression reinforcement bars 6 are symmetrically arranged in each concrete strip 5 . Concrete strip ladder bars 7 are 5mm steel bar sections that tie the concrete strip compression bars 6, which are welded with the concrete strip compression bars 6, and the distance between the concrete strip ladder bars 7 is 300mm. The distance between the concrete strip bolt holes 8 is not more than 600 mm, and the light square steel pipe and the concrete strip connecting bolt 11 pass through the holes to connect the concrete strip 5 and the light square steel pipe 9 .

The upper part of the steel bar truss 4 is welded with the concrete strip compression steel bar 6 to form the upper chord of the steel bar truss 4, and the lower part of the steel bar truss 4 is welded with the concrete floor reinforcement mesh 2 to form the lower chord of the steel bar truss 4, so that the concrete floor 1 and the concrete bar Bands 5 are connected together. Among them, the steel bar truss 4 is a triangular truss bar structure formed by bending a steel bar with a diameter of 5 mm, and the bending angle is 45°. The concrete strip ladder grid steel bar 7 passes through the lower part of its crest, and the lower part of the trough is welded and connected with the longitudinally distributed reinforcing bars of the concrete floor reinforcing mesh 2, and the transversely distributed reinforcing bars of the concrete floor reinforcing mesh 2 pass through the upper part of the trough; the truss The steel bar 4 is vertically arranged with the concrete base plate 1 and the concrete strip 5 . Each concrete strip 5 is welded and connected to the concrete floor reinforcement mesh 2 in the concrete floor 1 below through double-row steel bar trusses 4 , and the distance between the double-row steel bar trusses 4 is 160mm. The longitudinal reinforcement welded with the reinforcement truss 4 in the reinforcement mesh 2 of the concrete floor can adopt prestressed reinforcement to enhance the bending resistance of the wall panel, and the rest can adopt high-strength stress-relieving reinforcement.

Floor laminated layer structure, prefabricated floor in the post-casting area between the concrete strip with hollow steel truss and the concrete bottom slab 1 is the floor laminated layer, this area includes the partially exposed steel bar truss 4, and the laminated layer reinforcement mesh interspersed therein 14. Concrete is poured into the laminated layer of the floor slab to form the laminated layer, and then concrete 15 is poured, so that the concrete bottom plate 1, the concrete strip with hollow steel bar truss and the steel bar truss 4 form a whole. Laminated post-cast concrete 15 is concrete whose strength grade is not lower than C40. Laminated post-cast concrete 15 connects the concrete bottom plate 1 and the concrete strip 5 into a whole, and its upper surface is flush with the upper surface of the concrete strip 5 .

Wherein, the laminated steel mesh 14 is composed of steel bars with a diameter of 5 mm. The longitudinal reinforcement of the laminated layer steel mesh 14 is located at the upper part, and the distance between its upper surface and the lower surface of the concrete strip 5 is 10 mm; the transverse reinforcement is located at the lower part, and the distance between its lower surface and the upper surface of the concrete floor 1 is 10 mm; The longitudinal reinforcement and transverse reinforcement of the net 14 all protrude from the edge of the concrete floor 1 by 100mm, and overlap with the laminated reinforcement of the adjacent floor or the reinforcement in the structural beam respectively.

The light square steel pipe is a bending-resisting reinforced structure, and the inner part of the light square steel pipe 9 is welded and connected to locally strengthen the round steel pipe 10 . The light square steel pipe and the concrete strip connecting bolt 11 passes through the locally reinforced round steel pipe 10 and the concrete strip bolt hole 8 to connect the light square steel pipe 9 and the concrete strip 5 together. The light square steel pipe 9 is a square steel pipe of 80mm×80mm×4mm, and its main function is to strengthen the bending resistance of the floor. The light square steel pipe 9 and the concrete strip 5 are connected by connecting bolts 11 between the light square steel pipe and the concrete strip. The light square steel pipe 9 is removed after the construction of the concrete laminated layer is completed and maintained for 7 days, and the light square steel pipe 9 can be reused. The light-duty square steel pipe 9 can also be used as a floor lifting device to prevent the suspended concentrated load from causing damage to the floor. The locally reinforced round steel pipe 10 is a round steel pipe with an inner diameter of 14mm and a thickness of 3mm, which is welded to the opening of the light square steel pipe 9 to strengthen the local compressive capacity of the steel pipe wall at the opening to prevent the connection between the light square steel pipe and the concrete strip During the tightening of the bolt 11, the wall of the steel pipe buckles. Light square steel pipe and concrete strip connecting bolt 11 is M12 high-strength bolt, which passes through the locally reinforced round steel pipe 10 on the light square steel pipe 9 and the concrete strip bolt hole 8 to connect the light square steel pipe 9 with the concrete strip 5, and the distance No more than 600mm. During the bolt connection process, the end of the screw rod should pass through the light square steel pipe 9 and the concrete strip 5 downwards one time, and after tightening the nut on the lower surface of the concrete strip 5, the connecting bolt 11 of the light square steel pipe and the concrete strip exposes the length of the nut It should be within 5mm. After the composite layer concrete is poured and maintained, unscrew the screw to remove the light square steel pipe 9, and use high-strength mortar to seal the bolt hole 8 of the concrete strip.

At the floor leveling node, the connecting bolts 13 between the concrete floor and the square steel plate pass through the bolt holes on the leveling steel plate 12 and the bolt holes 3 on the concrete floor in turn to connect the leveling steel plate 12 and the concrete floor 1, and tighten the concrete floor to connect with the square steel plate Bolts 13 allow leveling of adjacent slabs. Among them, the leveling square steel plate 12 is a square steel plate of 200mm×200mm×5mm, on which four bolt holes are symmetrically opened, and the bolt holes on both sides are respectively aligned with the concrete bottom plate bolt holes 3 of the adjacent floor slab, and the bolt 13 is connected between the concrete bottom plate and the square steel plate For connection, the leveling square steel plate 12 is located at the bottom of the floor, and the contact surface with two adjacent floors is a plane, and the leveling square steel plate 12 is arranged along the long side of the floor, and the distance is less than or equal to 1000mm. After the laminated layer concrete is poured on the floor slab and maintained for 7 days, the square-adjusting steel plate 12 can be removed and used repeatedly. The connecting bolt 13 between the concrete floor and the square steel plate is an M12 high-strength bolt, which penetrates upwards at the bottom of the leveling steel plate 12, passes through the leveling steel plate 12 and the concrete bottom plate 1 in turn, and tightens the two on the upper surface of the concrete bottom plate 1 with a nut. The exposed nut does not exceed 5mm. After pouring the bottom concrete and curing for 7 days, the connecting bolts 13 between the concrete base plate and the square steel plate can be unscrewed, and the bolt holes 3 of the concrete base plate can be sealed with high-strength mortar.

The method of superimposing one-way floor slabs with prefabricated light steel reinforced trusses with vierendeel reinforcement concrete strips includes the following steps:

Step 1: factory prefabricated concrete floor reinforcement mesh 2, concrete strip compression reinforcement 6 and concrete strip ladder grid reinforcement 7, prefabricated reinforcement truss 4, and combined reinforcement truss 4 with concrete bottom slab reinforcement mesh 2 and concrete strip compression reinforcement 6 Welding, pouring the concrete floor 1 and the concrete strip 5, and reserving the bolt holes 3 of the concrete floor and the bolt holes 8 of the concrete strip to form a superimposed unidirectional floor slab with hollow reinforced truss concrete strips; factory prefabricated light square steel pipes 9, Open a hole on the light square steel pipe 9 and weld a partially reinforced round steel pipe 10 in the hole;

Step 2: transport the prefabricated floor slab to the site, install the light square steel pipe 9 on the concrete strip 5 with the connecting bolt 11 between the light square steel pipe and the concrete strip on the ground, and then lift it into place;

Step 3: After the superimposed prefabricated one-way floor slab with empty-web steel truss truss with light square steel pipe 9 is hoisted in place, connect the adjacent floor slabs through the leveling square steel plate 12 with the concrete bottom slab and the square steel plate connecting bolt 13, Tighten the bolts 13 connecting the concrete bottom slab and the square steel plate to level the floor slab;

Step 4: Penetrate the superimposed layer reinforcement mesh 14 into the floor superimposed layer between the concrete base plate 1 and the concrete strip 5, and overlap the reinforcing bars between adjacent floors;

Step 5: After pouring the superimposed layer, concrete 15 is poured, and the surface of the superimposed layer post-cast concrete 15 is flush with the surface of the concrete strip 5;

Step 6: After curing the composite layer concrete for 7 days, unscrew the connecting bolt 11 between the light square steel pipe and the concrete strip, unscrew the connecting bolt 13 between the concrete bottom plate and the square steel plate, and use high-strength mortar to seal the bolt hole 8 of the concrete strip and concrete base plate bolt holes3.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solutions of the present invention and its Any equivalent replacement or change of the inventive concept shall fall within the protection 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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