Prefabricated assembly type prestressed honeycomb steel reinforced concrete floor slab and construction method

Abstract

The prefabricated assembly type prestressed honeycomb steel reinforced concrete floor slab comprises a reinforcement cage, honeycomb steel, steel strands and concrete. The honeycomb-shaped steel is arranged at equal intervals in the direction perpendicular to the extension direction of the floor slab; the reinforcement cage is composed of longitudinally-distributed steel bars parallel to the honeycomb profile steel and transversely-distributed steel bars perpendicular to the honeycomb profile steel. A plurality of corrugated pipes parallel to the honeycomb profile steel are arranged in the reinforcement cage at equal intervals, the steel strands are arranged in the corrugated pipes, the two ends of each steel strand extend outwards by a certain length, and anchorage devices are arranged at the two ends of each steel strand; and the concrete is integrally poured along the floor slab surface. The construction efficiency is improved in a prefabricated assembly mode, the honeycomb type steel and the steel strands are arranged in the concrete floor, the bending resistance bearing capacity is improved, meanwhile, the self weight of the structure is reduced, crack development is effectively restrained, the durability of the structure is enhanced, the deformation performance of the structure is optimized through reasonable arrangement of the steel strands, and the construction cost is reduced. And the bending rigidity of the structure is improved, so that the stability and bearing capacity of the structure are enhanced.

Description

Technical Field

[0001] The invention belongs to the field of building technology, and particularly relates to a prefabricated assembled prestressed honeycomb steel concrete floor slab and a construction method. Background Art

[0002] At present, floor slabs still basically adopt reinforced concrete structure, but due to the heavy self-weight of traditional cast-in-place reinforced concrete floor slabs, the burden on the building structure is increased, and its heavy structure also greatly limits the high utilization of space. At the same time, traditional concrete floor slabs are prone to cracks due to temperature changes, shrinkage, loads and other factors, affecting the safety and durability of the structure. The construction period is also delayed during the process of pouring concrete and waiting for the floor slabs to harden. Summary of the invention

[0003] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a prefabricated prestressed honeycomb steel concrete floor and construction method, which combines steel and concrete to improve the bearing capacity of the floor. The components of the prefabricated structure can be standardized and mechanized in the factory to ensure that the quality of the components is controllable. The components are prefabricated in the factory and only need to be assembled during on-site construction, which reduces on-site construction time and improves construction efficiency.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A prefabricated prestressed honeycomb steel concrete floor slab, comprising a steel cage, honeycomb steel, steel strands and concrete; the honeycomb steel is arranged at equal intervals along a direction perpendicular to the extension direction of the floor slab;

[0006] The steel cage is composed of longitudinally distributed steel bars parallel to the honeycomb steel and transversely distributed steel bars perpendicular to the honeycomb steel; a number of corrugated tubes parallel to the honeycomb steel are arranged at equal distances in the steel cage, the steel strands are arranged in the corrugated tubes and both ends extend outward by a certain length, and anchors are arranged at both ends; the concrete is poured as a whole along the floor surface.

[0007] In one embodiment, the longitudinal distribution steel bars are combined with the transverse distribution steel bars by binding or welding, the longitudinal distribution steel bars are evenly arranged at upper and lower ends, and the transverse distribution steel bars are evenly arranged along the longitudinal direction of the floor slab.

[0008] In one embodiment, the corrugated tube is arranged below the center line of the steel cage.

[0009] In one embodiment, the corrugated tube is a metal corrugated tube, a plastic corrugated tube or a PVC tube, and its diameter is slightly larger than the diameter of the steel strand.

[0010] In one embodiment, the steel strand is an ordinary steel strand or an unbonded steel strand. After the floor slab is transported to the site and assembled, fixed anchors are installed at both ends of the steel strand, and the steel strand is tensioned using a through-type jack according to the initial prestressing design value. After the tensioning stress stabilizes, the excess part extending out of the anchor is cut off.

[0011] In one embodiment, the anchor is a common anchor or a porous anchor, which is composed of an anchor plate and a clip.

[0012] In one embodiment, the honeycomb steel is manufactured by cutting the fold line of the H-shaped steel web by laser or plasma, and then connecting by laser welding or arc welding.

[0013] In one embodiment, the tension zone at the flange of the honeycomb steel is a wide flange, and the compression zone is a narrow flange.

[0014] In one embodiment, the concrete is factory-cast recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete, thermal insulation concrete, high-performance concrete or ultra-high-performance concrete, and the standard value of the concrete cube compressive strength is not less than 30 MPa.

[0015] The present invention also provides the prefabricated prestressed honeycomb steel concrete floor slab, the steps are as follows:

[0016] 1) In the factory, honeycomb steel, longitudinal distribution steel bars and transverse distribution steel bars are processed according to the design requirements, and then the longitudinal distribution steel bars and transverse distribution steel bars are combined to form a steel cage, and the honeycomb steel and corrugated pipe are placed in the designated position in the steel cage according to the design requirements, and the steel strands are inserted into the corrugated pipe in sequence;

[0017] 2) In the factory, the steel frame of the floor slab is fixed, the formwork is set up, the concrete is poured and vibrated to make it dense, and after 28 days of curing, it is transported to the construction site;

[0018] 3) At the construction site, the prefabricated floor slabs are tensioned without bonding and then assembled to complete the construction.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) Excellent structural performance

[0021] This new type of floor slab combines the strength of steel and the strong compressive resistance of concrete by setting honeycomb steel in the middle of the reinforced concrete floor slab, thereby improving the bearing capacity of the structure. The honeycomb structure of the steel strengthens the bonding performance between the steel and concrete, further improves the bending bearing capacity of the structure and reduces its own weight. The honeycomb steel adopts a narrow flange in the compression zone and a wide flange in the tension zone. By rationally designing the flange length, the stress borne by the structure is more uniform, and the bending stiffness of the steel is improved. By setting prestress, the strength and stiffness of the floor slab are improved, the occurrence of cracks in the floor slab is effectively controlled, the durability of the structure is enhanced, the deformation of the floor slab structure is reduced, and the flatness and stability of the floor slab are maintained.

[0022] 2) Efficient, convenient and good social benefits

[0023] This new type of floor slab can reduce the workload on the construction site, improve the work efficiency on the construction site, ensure the quality of concrete pouring, and reduce the impact of seasons on construction by prefabricating in the factory and assembling and tensioning on site. At the same time, this new type of floor slab can reduce the amount of concrete, reduce the dead weight of the structure, reduce the effect of earthquakes, and reduce the cost of the project by giving full play to the combined stress performance of concrete and steel. When ultra-high performance concrete is used, the amount of concrete can also be reduced, and the use of maintenance components and materials can be reduced to a certain extent. Therefore, this new type of floor slab has certain social value and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a detailed structural schematic diagram of the prefabricated assembled prestressed honeycomb steel concrete floor slab of the present invention.

[0025] Figure 2 It is a three-dimensional schematic diagram of the prefabricated assembled prestressed honeycomb steel concrete floor slab of the present invention.

[0026] Figure 3 yes Figure 2 Section 1-1 is a detailed drawing of the prefabricated prestressed honeycomb steel concrete floor slab.

[0027] Figure 4 It is a three-dimensional schematic diagram of the honeycomb steel of the prefabricated assembled prestressed honeycomb steel concrete floor slab of the present invention.

[0028] Explanation of reference numerals:

[0029] Steel cage 1; honeycomb steel 2; steel strand 3; concrete 4; transverse distribution steel bars 1-1; longitudinal distribution steel bars 1-2; corrugated pipe 5; anchor 6. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below with reference to the accompanying drawings and examples.

[0031] likeFigure 1 , Figure 2 and Figure 3 As shown, a prefabricated prestressed honeycomb steel concrete floor slab of the present invention is mainly composed of a steel cage 1, a honeycomb steel 2, a steel strand 3 and concrete 4. Among them, the steel cage 1 is composed of a number of longitudinally distributed steel bars 1-2 and a number of transversely distributed steel bars 1-1, each longitudinally distributed steel bar 1-2 is parallel to the honeycomb steel 2, and each transversely distributed steel bar 1-1 is perpendicular to the honeycomb steel 2, and the two are arranged crosswise to form a three-dimensional structure. There are multiple honeycomb steels 2, which are arranged at equal intervals along the extension direction perpendicular to the floor slab. A number of corrugated pipes 5 are arranged at equal distances in the steel cage 1, and the corrugated pipes 5 are parallel to the honeycomb steel 2 and can be arranged between adjacent longitudinally distributed steel bars 1-2. The steel strands 3 are respectively arranged in each corrugated pipe 5, with both ends extending outward by a certain length, and anchors 6 are arranged at the ends. Concrete 4 is poured as a whole along the floor slab surface, and finally the prefabricated prestressed honeycomb steel concrete floor slab of the present invention is formed.

[0032] According to the above structure, the present invention utilizes the advantages of steel-concrete structure and prefabricated building. By setting honeycomb steel in the middle of reinforced concrete floor, the tensile strength of structural steel and the compressive strength of concrete can be fully utilized to improve the mechanical properties of the structure. The use of honeycomb steel reduces the amount of steel used, strengthens the bonding performance between steel and concrete, further improves the bending bearing capacity of the structure, and reduces the deadweight of the structure. At the same time, concrete can provide good fire resistance. The steel is coated with concrete, which reduces the impact of fire on the steel and has good fire resistance. The steel enhances the strength of the structure, so that the steel-concrete floor can maintain good durability in long-term use. By setting prestress and arranging it horizontally at both ends of the floor and between the steel, the bending stiffness and bearing capacity of the floor are improved, the occurrence of cracks in the floor is effectively controlled, and the durability of the structure is enhanced. At the same time, the prestressed tendons can automatically reset the floor after an earthquake, reducing residual deformation, thereby reducing repair costs and recovery time.

[0033] The invention improves construction efficiency by prefabricating in the factory in advance and assembling after tensioning at the construction site. The prefabricated assembly structure adopts a standardized design, which can optimize material use and reduce costs.

[0034] In a further embodiment of the present invention, the longitudinal distribution steel bars 1-2 are evenly arranged at intervals at the upper and lower ends of the floor slab. The present invention arranges two layers, and the ends of the lower longitudinal distribution steel bars are bent upward, and the ends of the upper longitudinal distribution steel bars are bent downward, overlapping into a ring. The transverse distribution steel bars 1-1 are evenly arranged along the longitudinal direction of the floor slab, and the ends of the lower transverse distribution steel bars are bent upward, and the ends of the upper transverse distribution steel bars are bent downward, overlapping into a ring, and the longitudinal distribution steel bars 1-2 and the honeycomb steel 2 are hooped, wherein the longitudinal distribution steel bars 1-2 and the transverse distribution steel bars 1-1 can be combined by binding or welding.

[0035] In a further embodiment of the present invention, the corrugated pipe 5 is specifically arranged below the center line of the steel cage 1. For example, it can be placed on the lower layer of transversely distributed steel bars and can be arranged at equal distances in the transverse direction of the floor slab. The corrugated pipe 5 can be a metal corrugated pipe, a plastic corrugated pipe or a PVC pipe, etc., and its diameter should be slightly larger than the diameter of the steel strand 3 so that the steel strand 3 can pass through the pipe.

[0036] In a further embodiment of the present invention, the steel strand 3 is an ordinary steel strand or an unbonded steel strand. After the floor slab is transported to the site for assembly, fixed anchors 6 are installed at both ends of the steel strand 3, and the steel strand 3 is tensioned by a through-type jack according to the initial prestressing design value. After the tensioning stress is stabilized, the excess part extending out of the anchor is cut off. The anchor 6 can be an ordinary anchor or a porous anchor, which is mainly composed of an anchor pad and a clip. The prestressed tendons of the present invention are arranged in a transverse manner, between two steel sections and on both sides of the steel section, which can improve the bending stiffness of the area and reduce the gap with the bending stiffness of the steel section area. At the same time, the arrangement of the prestressed tendons of the present invention enables the floor slab to have self-resetting ability, and can automatically reset after an earthquake, reducing residual deformation, thereby reducing repair costs and recovery time.

[0037] In a further embodiment of the present invention, Figure 4 As shown, the honeycomb steel 2 is an H-shaped steel structure with honeycomb holes on the web. Specifically, the fabrication can be completed by cutting the web fold line with laser or plasma and then connecting by laser welding or arc welding.

[0038] Preferably, the flanges of the honeycomb steel 2 of the present invention use wide flanges in the tension zone and narrow flanges in the compression zone. This design can optimize the cross-sectional size of the steel, improve the stress-bearing performance of the plate, and maximize the mechanical properties of the steel.

[0039] In a further embodiment of the present invention, the concrete 4 can be factory-cast recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete, thermal insulation concrete, high-performance concrete or ultra-high-performance concrete, and its standard value of cube compressive strength is not less than 30 MPa.

[0040] According to the design method of prefabricated and assembled prestressed honeycomb steel concrete floor proposed in the present invention, the honeycomb steel can adjust the steel spacing, size, strength and expansion ratio as well as the upper and lower flange widths according to the actual engineering design. At the same time, a variety of rigid components such as steel pipes can also be used to replace the honeycomb steel to achieve the optimized design of this example, so that the new floor can be suitable for different engineering requirements.

[0041] The construction steps of the prefabricated prestressed honeycomb steel concrete floor slab of the present invention are as follows:

[0042] 1. In the factory, the honeycomb steel 2, the longitudinal distribution steel bars 1-2 and the transverse distribution steel bars 1-1 are processed according to the design requirements, and then the longitudinal distribution steel bars 1-2 and the transverse distribution steel bars 1-1 are combined to form a steel cage 1, and the honeycomb steel 2 and the corrugated pipe 5 are placed in the designated positions in the steel cage 1 according to the design requirements, and the steel strands 3 are inserted into the corrugated pipe 5 in sequence.

[0043] 2. In the factory, fix the steel frame of the floor, set up the formwork, pour the concrete 4 and vibrate it to make it dense. After 28 days of curing, transport it to the construction site.

[0044] 3. At the construction site, the prefabricated floor slabs are tensioned without bonding and then assembled to complete the construction.

[0045] The present invention manufactures floor slab components in a factory through prefabrication and assembly, tensions steel strands on the floor slab on the construction site, and assembles the floor slab after tensioning, thereby improving construction efficiency. Meanwhile, honeycomb steel and steel strands are arranged in the concrete floor slab, thereby improving the bending bearing capacity of the floor slab while reducing the dead weight of the structure and saving materials. The development of cracks is effectively suppressed, the durability of the structure is enhanced, the deformation performance of the structure is optimized through the reasonable arrangement of steel strands, the bending stiffness of the structure is improved, thereby enhancing the stability and bearing capacity of the structure, and the present invention has broad engineering application prospects.

Claims

1. A prefabricated prestressed honeycomb steel concrete floor, characterized in that: It comprises a steel cage (1), honeycomb steel (2), steel strands (3) and concrete (4); the honeycomb steel (2) is arranged at equal intervals in a direction perpendicular to the extension direction of the floor slab; The steel cage (1) is composed of longitudinally distributed steel bars (1-2) parallel to the honeycomb steel (2) and transversely distributed steel bars (1-1) perpendicular to the honeycomb steel (2); a plurality of corrugated pipes (5) parallel to the honeycomb steel (2) are arranged at equal distances in the steel cage (1); the steel strand (3) is arranged in the corrugated pipe (5) with both ends extending outward by a certain length, and anchors (6) are arranged at both ends; the concrete (4) is integrally poured along the floor surface.

2. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 is characterized in that: The longitudinal distribution steel bars (1-2) and the transverse distribution steel bars (1-1) are combined by binding or welding, the longitudinal distribution steel bars (1-2) are evenly arranged at intervals at the upper and lower ends, and the transverse distribution steel bars (1-1) are evenly arranged along the longitudinal direction of the floor slab.

3. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 is characterized in that: The corrugated pipe (5) is arranged at a position below the center line of the steel cage (1).

4. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 is characterized in that: The bellows (5) is a metal bellows, a plastic bellows or a PVC tube, and its diameter is slightly larger than the diameter of the steel strand (3).

5. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 is characterized in that: The steel strand (3) is an ordinary steel strand or an unbonded steel strand. After the floor slab is transported to the site for assembly, fixed anchors (6) are installed at both ends of the steel strand (3), and the steel strand (3) is tensioned using a through-type jack according to the initial tension prestressing design value. After the tensioning stress is stabilized, the excess part extending out of the anchor is cut off.

6. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 is characterized in that: The anchor (6) is a common anchor or a porous anchor, and is composed of an anchor plate and a clip.

7. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 is characterized in that: The honeycomb steel (2) is manufactured by cutting the fold line of the H-shaped steel web by laser or plasma, and then connecting by laser welding or arc welding.

8. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1 or 7, characterized in that: The tension zone at the flange of the honeycomb steel (2) is a wide flange, and the compression zone is a narrow flange.

9. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1, characterized in that: The concrete (4) is recycled concrete, lightweight aggregate concrete, rubber concrete, sound-absorbing concrete, thermal insulation concrete, high-performance concrete or ultra-high-performance concrete poured in a factory, and the standard value of the cubic compressive strength of the concrete (4) is not less than 30 MPa.

10. The prefabricated prestressed honeycomb steel concrete floor slab according to claim 1, characterized in that: Here are the steps: 1) In a factory, the honeycomb steel (2), the longitudinal distribution steel bars (1-2) and the transverse distribution steel bars (1-1) are processed according to design requirements, and then the longitudinal distribution steel bars (1-2) and the transverse distribution steel bars (1-1) are combined to form a steel cage (1), the honeycomb steel (2) and the corrugated pipe (5) are placed at designated positions in the steel cage (1) according to design requirements, and the steel strands (3) are inserted into the corrugated pipe (5) in sequence; 2) In the factory, the steel frame of the floor slab is fixed, the formwork is set up, the concrete is poured (4) and vibrated to make it dense, and after 28 days of curing, it is transported to the construction site; 3) At the construction site, the prefabricated floor slabs are tensioned without bonding and then assembled to complete the construction.

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