A prefabricated floor slab connection system and construction method thereof

Abstract

The present invention discloses an assembled prefabricated floor connection system and a construction method thereof, the construction method comprising the following steps: 1) tying a floor steel mesh in a workshop, a plurality of longitudinal stress-bearing steel bars are pre-embedded on the steel mesh, and the longitudinal stress-bearing steel bars on two steel meshes are connected by a plurality of connecting steel bars and sleeves; 2) pouring concrete of the steel mesh to form a floor; 3) unscrewing the sleeves to separate the mutually connected floor slabs, and transporting the floor slabs to a construction site; 4) welding a shear steel plate to a steel beam at the construction site; 5) a plurality of connecting steel bars pass through the shear steel plate, and the two ends of the connecting steel bars are respectively connected to the longitudinal stress-bearing steel bars on the two floor slabs by sleeves; 6) pouring concrete at the connection between the floor slab and the steel beam. The floor slab of the present invention is effectively connected at the node, ensuring the stress-bearing performance at the node connection. At the same time, the prefabricated floor slab is mass-produced in the workshop, and the on-site hoisting and mechanical connection operations are convenient, the construction speed is fast, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building structure engineering. Background Art

[0002] Cast-in-place concrete slabs are the most commonly used method for slab construction due to their good mechanical properties and reliable connections. However, the construction process of cast-in-place concrete is complex, requiring the installation of formwork and the maintenance of concrete at the construction site. Not only is the construction period long and the construction speed slow, but the quality of the concrete is also difficult to guarantee.

[0003] As a result, prefabricated floor slabs have been introduced into the construction field in large quantities. However, the stress-bearing performance of the node connections of existing prefabricated floor slabs is poor, the construction process of existing cast-in-place concrete floor slabs is complicated, the construction speed is slow and the cycle is long, and the maintenance conditions during on-site maintenance are poor, making it difficult to ensure the quality.

[0004] Therefore, it is urgent to develop a prefabricated floor connection construction method that can solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide an assembled prefabricated floor slab connection system and a construction method thereof.

[0006] The technical solution adopted to achieve the purpose of the present invention is as follows: an assembled prefabricated floor connection system includes a shear steel plate, a steel beam, a plurality of connecting steel bars, a plurality of sleeves and a floor.

[0007] The upper surface of the steel beam is vertically welded with a shear steel plate, and the longitudinal direction of the steel beam is consistent with the length direction of the shear steel plate. The shear steel plate is provided with a plurality of through holes for connecting steel bars to pass through, and a plurality of connecting steel bars pass through the through holes.

[0008] Floor slabs are arranged on both sides of the steel beam, and a plurality of longitudinal stress-bearing steel bars parallel to each other are embedded in the floor slabs. Both ends of each longitudinal stress-bearing steel bar extend out of the floor slabs, and each longitudinal stress-bearing steel bar corresponds to a connecting steel bar coaxial with the same.

[0009] The longitudinal stress-bearing steel bars on each floor slab are connected with the coaxial connecting steel bars through a sleeve.

[0010] Furthermore, both ends of the longitudinal stress-bearing steel bar are provided with external threads, and the length of the external threads is L. Both ends of the connecting steel bar are provided with external threads, and the length of the external threads is L / 2. The sleeve is provided with internal threads running through both ends thereof, and the length of the sleeve is L, L>0. The external threads of the longitudinal stress-bearing steel bar and the connecting steel bar are matched with the internal threads of the sleeve.

[0011] Furthermore, the width of the shear-resistant steel plate is the same as the thickness of the floor slab. The steel beam is an I-beam or an H-beam, and the web thickness of the steel beam is the same as the thickness of the shear-resistant steel plate.

[0012] Furthermore, the outer diameter of the external thread connecting the two ends of the steel bar is d 2 The outer diameter of the external threads at both ends of the longitudinal force-bearing steel bars is d 2 , the diameter of the middle section of the longitudinal reinforcement is d, then d>0.

[0013] Furthermore, the through hole is a regular hexagonal through hole, and the cross-section of the middle section of the connecting steel bar is a regular hexagon, and the side length of the regular hexagon is a, and a=d / 2.

[0014] Further, the external thread length L at both ends of the longitudinal stress-bearing steel bars is calculated as follows:

[0015]

[0016] Where: d 1 It is the inner diameter of the external threads at both ends of the longitudinal stress-bearing steel bars, in mm. 2 The outer diameter of the external threads at both ends of the longitudinal stress-bearing steel bars, in mm. y f is the tensile strength of the steel bar y , unit is MPa N / mm 2 .f v f is the shear strength of the steel bar v , unit is MPa N / mm 2 .

[0017] Furthermore, the through holes on the shear resistant steel plate are arranged in a staggered manner.

[0018] A construction method of the above-mentioned prefabricated floor connection system includes the following steps:

[0019] 1) Weld the shear steel plate vertically to the upper surface of the steel beam, wherein the longitudinal direction of the steel beam is consistent with the length direction of the shear steel plate, and the shear steel plate is provided with a plurality of through holes for connecting steel bars to pass through.

[0020] 2) Passing a plurality of the connecting steel bars through the through holes.

[0021] 3) Hoist two floor slabs to both sides of the steel beam. A number of longitudinal stress-bearing steel bars parallel to each other are embedded in the floor slabs, both ends of each longitudinal stress-bearing steel bar extend out of the floor slabs, and each longitudinal stress-bearing steel bar corresponds to a connecting steel bar coaxial with it.

[0022] 4) Connect the longitudinal stress-bearing steel bars on each floor slab to the coaxial connecting steel bars through a sleeve.

[0023] 5) pouring concrete at the connection between the floor slab and the steel beam.

[0024] Furthermore, before step 1), there is also a step of prefabricating the floor slab, the steps are as follows:

[0025] 0-1) Several steel meshes of floor slabs are tied in a workshop, and several longitudinal stress-bearing steel bars parallel to each other are tied on each steel mesh, and the axial directions of the several longitudinal stress-bearing steel bars are parallel to the mesh surface of the steel mesh, and both ends of the longitudinal stress-bearing steel bars extend out of the steel mesh.

[0026] 0-2) A plurality of connecting steel bars are arranged between two adjacent steel meshes, and both ends of each connecting steel bar correspond to coaxial longitudinal force-bearing steel bars therewith, and both ends of each connecting steel bar are respectively connected to the longitudinal force-bearing steel bars on the two steel meshes through sleeves.

[0027] 0-3) Concrete is poured on each of the steel meshes to form a floor slab, and both ends of the longitudinal force-bearing steel bars extend out of the floor slab.

[0028] 0-4) After the concrete strength reaches the standard, the sleeve at the connection is removed to separate the two floor slabs connected to each other.

[0029] 0-5) Transport several prefabricated floor slabs to the construction site.

[0030] Furthermore, the two floor slabs in step 3) are separated from steps 0-4).

[0031] The beneficial effects of the present invention are:

[0032] 1. Prefabricated floor slabs are mass-produced in the workshop, and the on-site hoisting and mechanical connection operations are convenient, the construction speed is fast, and the production efficiency is improved;

[0033] 2. Precast concrete slabs are effectively connected at the nodes using sleeves to ensure the stress performance of the node connections. At the same time, the connections are pre-connected in the workshop to avoid deviations during the on-site installation process and improve work efficiency;

[0034] 3. The dimensions of each connecting part have been carefully calculated, and the middle section of the connecting steel bar is designed as a regular hexagon, which can prevent the relative rotation between the connecting steel bar and the shear steel plate, further improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a connection diagram of prefabricated floor slabs;

[0036] Figure 2 This is the front view of the connection between the shear steel plate and the steel beam;

[0037] Figure 3 It is the side view of the connection between the shear steel plate and the steel beam;

[0038] Figure 4Schematic diagram of connecting steel bars.

[0039] In the figure: shear steel plate 1, through hole 101, steel beam 2, connecting steel bar 3, longitudinal stress-bearing steel bar 4, casing 5 and floor slab 6. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0041] Embodiment 1:

[0042] This embodiment discloses an assembled prefabricated floor slab connection system, including a shear-resistant steel plate 1, a steel beam 2, a plurality of connecting steel bars 3, a plurality of sleeves 5 and a floor slab 6.

[0043] See also Figure 3 The steel beam 2 is an I-beam, and a shear steel plate 1 is vertically welded to the upper surface of the upper flange of the steel beam 2. The web thickness of the steel beam 2 is the same as that of the shear steel plate 1, both of which are b 0 , b 0 >0. The longitudinal direction of the upper surface of the steel beam 2 is consistent with the length direction of the shear steel plate 1. Figure 2 The shear steel plate 1 is provided with a plurality of through holes 101 for the connecting steel bars 3 to pass through. The plurality of through holes 101 are divided into two rows, upper and lower. The two rows of through holes 101 are staggered and arranged at equal intervals. Figure 4 , both ends of the connecting steel bar 3 are provided with external threads, the number of thread turns is n / 2, the thread root width is b, and the length of the external threads is L / 2, L>0, n>0, b>0. The outer diameter of the external threads at both ends of the connecting steel bar 3 is d 2 , inner diameter is d 1 , then the length of connecting steel bar 3 is L+b 0 .

[0044] See also Figure 2 The through hole 101 is a regular hexagonal through hole, and the cross-section of the middle section of the connecting steel bar 3 is a regular hexagon, and the side length of the regular hexagon is a.

[0045] See also Figure 1 , both sides of the steel beam 2 are provided with floor slabs 6, and the longitudinal length of the floor slabs 6 is L 0 , the width of the shear steel plate 1 is the same as the thickness of the floor slab 6, both are h 0 ,h 0 >0.

[0046] A plurality of longitudinal stress-bearing steel bars 4 are embedded in the floor 6, and both ends of each longitudinal stress-bearing steel bar 4 extend out of the floor 6. Each longitudinal stress-bearing steel bar 4 corresponds to a connecting steel bar 3 coaxial with it. Both ends of the longitudinal stress-bearing steel bar 4 are provided with external threads, the number of threads is n, the thread root width is b, and the length of the external threads is L. Then the length of the longitudinal stress-bearing steel bar 4 is L. 0 +2L. The outer diameter of the external threads at both ends of the longitudinal force-bearing steel bar 4 is d 2 , inner diameter is d 1 , the diameter of the middle section of the longitudinal force-bearing steel bar 4 is d, then a=d / 2, d>0.

[0047] The sleeve 5 is provided with internal threads running through both ends thereof, the length of the sleeve 5 is L, and the external threads of the longitudinal stress-bearing steel bars 4 and the connecting steel bars 3 are matched with the internal threads of the sleeve 5. The longitudinal stress-bearing steel bars 4 on each of the floor slabs 6 are connected to the coaxial connecting steel bars 3 through the sleeve 5.

[0048] The longitudinal stress-bearing steel bars 4 in the floor slab 6 can withstand the tensile force The threads within the length of L / 2 can withstand the shear force along the longitudinal direction of the longitudinal reinforcement 4 When F is equal to F', we can get but In the formula, f y f is the tensile strength of the steel bar y , determined by the strength grade of the selected steel bar, in MPa N / mm 2 ;f v f is the shear strength of the steel bar v , determined by the strength grade of the selected steel bar, in MPa N / mm 2 .

[0049] Embodiment 2:

[0050] This embodiment is based on an assembled prefabricated floor slab connection system described in Embodiment 1, and discloses a construction method of the system, comprising the following steps:

[0051] 1) Several steel meshes of floor slabs are tied in a workshop, and several longitudinal stress-bearing steel bars 4 parallel to each other are tied on each steel mesh, and the axial directions of the several longitudinal stress-bearing steel bars 4 are parallel to the mesh surface of the steel mesh, and both ends of the longitudinal stress-bearing steel bars 4 extend out of the steel mesh.

[0052] 2) A plurality of connecting steel bars 3 are arranged between two adjacent steel meshes, and both ends of each connecting steel bar 3 correspond to coaxial longitudinal stress-bearing steel bars 4 therewith, and both ends of each connecting steel bar 3 are respectively connected to the longitudinal stress-bearing steel bars 4 on the two steel meshes through sleeves 5.

[0053] 3) Concrete is poured on each of the steel meshes to form a floor slab 6, with both ends of the longitudinal force-bearing steel bars 4 extending out of the floor slab 6.

[0054] 4) After the concrete strength reaches the standard, the sleeve 5 at the connection is rotated toward the floor slab so that the sleeve 5 remains on the longitudinal stress-bearing steel bar 4, and the connecting steel bar 3 is removed to separate the two floor slabs 6 connected to each other.

[0055] 5) Transporting the prefabricated floor slabs 6 to the construction site.

[0056] 6) The shear steel plate 1 is vertically welded to the upper surface of the steel beam 2. The longitudinal direction of the steel beam 2 is consistent with the length direction of the shear steel plate 1, and the shear steel plate 1 is provided with a plurality of through holes 101 for the connecting steel bars 3 to pass through.

[0057] 7) Pass a plurality of the connecting steel bars 3 through the through holes 101 .

[0058] 8) Hoist two floor slabs 6 to both sides of the steel beam 2, and these two floor slabs 6 are the two floor slabs 6 separated in step 4).

[0059] 9) Rotate the sleeve 5 on each of the longitudinal stress-bearing steel bars 4 toward the shear steel plate 1 so that the sleeve 5 is simultaneously sleeved on the longitudinal stress-bearing steel bars 4 and the connecting steel bars 3 , and one end of the sleeve 5 close to the shear steel plate 1 abuts against the shear steel plate 1 .

[0060] 10) Pour concrete at the connection between the floor slab 6 and the steel beam 2, and maintain it.

[0061] Embodiment 3:

[0062] This embodiment discloses an assembled prefabricated floor connection system applied to the construction method described in Example 1, including a shear steel plate 1, a steel beam 2, a plurality of connecting steel bars 3, a plurality of sleeves 5 and a floor slab 6.

[0063] See also Figure 2 Or 3, a shear steel plate 1 is vertically welded to the upper surface of the steel beam 2, and the longitudinal direction of the steel beam 2 is consistent with the length direction of the shear steel plate 1. The shear steel plate 1 is provided with a plurality of through holes 101 for connecting steel bars 3 to pass through, and a plurality of connecting steel bars 3 pass through the through holes 101.

[0064] See also Figure 1 Floor slabs 6 are provided on both sides of the steel beam 2, and a plurality of mutually parallel longitudinal stress-bearing steel bars 4 are embedded in the floor slabs 6. Both ends of each longitudinal stress-bearing steel bar 4 extend out of the floor slabs 6, and each longitudinal stress-bearing steel bar 4 corresponds to a connecting steel bar 3 coaxial therewith.

[0065] The longitudinal force-bearing steel bars 4 on each floor slab 6 are connected to the coaxial connecting steel bars 3 via a sleeve 5. Concrete is poured at the connection between the floor slab 6 and the steel beam 2.

[0066] Embodiment 4:

[0067] The main steps of this embodiment are the same as those of embodiment 3. Figure 1 , both ends of the longitudinal force-bearing steel bar 4 are provided with external threads, and the length of the external threads is L. Figure 4 Both ends of the connecting steel bar 3 are provided with external threads, and the length of the external threads is L / 2. The sleeve 5 is provided with internal threads running through both ends thereof, and the length of the sleeve 5 is L, L>0. The external threads of the longitudinal force-bearing steel bar 4 and the connecting steel bar 3 are matched with the internal threads of the sleeve 5.

[0068] Embodiment 5:

[0069] The main steps of this embodiment are the same as those of embodiment 4. Furthermore, the width of the shear-resistant steel plate 1 is the same as the thickness of the floor slab 6. Figure 3 The steel beam 2 is an I-beam, and the web thickness of the steel beam 2 is the same as the thickness of the shear steel plate 1.

[0070] Embodiment 6:

[0071] The main steps of this embodiment are the same as those of embodiment 5. Furthermore, the outer diameter of the external thread connecting the two ends of the steel bar 3 is d 2 The outer diameter of the external threads at both ends of the longitudinal force-bearing steel bar 4 is d 2 , the diameter of the middle section of the longitudinal force-bearing steel bar 4 is d, then d>0.

[0072] Embodiment 7:

[0073] The main steps of this embodiment are the same as those of embodiment 6. Figure 2 The through hole 101 is a regular hexagonal through hole, and the cross section of the middle section of the connecting steel bar 3 is a regular hexagon, the side length of the regular hexagon is a, and a=d / 2. The through hole 101 and the middle section of the connecting steel bar 3 are designed as regular hexagons, which can avoid relative rotation between the connecting steel bar 3 and the shear steel plate 1, and improve the connection construction efficiency.

[0074] Embodiment 8:

[0075] The main steps of this embodiment are the same as those of Embodiment 7. Furthermore, the length L of the external threads at both ends of the longitudinal stress-bearing steel bars 4 is calculated as follows:

[0076]

[0077] Where: d 1 It is the inner diameter of the external threads at both ends of the longitudinal stress-bearing steel bar 4, in mm.2 The outer diameter of the external threads at both ends of the longitudinal stress-bearing steel bar 4, in mm. y f is the tensile strength of the steel bar y , unit is MPa N / mm 2 .f v f is the shear strength of the steel bar v , unit is MPa N / mm 2 The workpiece size can be strictly controlled according to the calculation formula, and the cost can be saved to the maximum extent while ensuring the stability of the force.

[0078] Embodiment 9:

[0079] The main steps of this embodiment are the same as those of embodiment 8. Figure 2 The plurality of through holes 101 are divided into two rows, an upper row and a lower row. The two rows of through holes 101 are staggered and arranged at equal intervals, ensuring that the shear-resistant steel plate 1 is subjected to a relatively uniform shear force, thereby improving the overall stability.

Claims

1. An assembled prefabricated floor connection system, characterized in that: It comprises a shear-resistant steel plate (1), a steel beam (2), a plurality of connecting steel bars (3), a plurality of casing pipes (5) and a floor slab (6); A shear steel plate (1) is vertically welded to the upper surface of the steel beam (2), and the longitudinal direction of the steel beam (2) is consistent with the length direction of the shear steel plate (1); the shear steel plate (1) is provided with a plurality of through holes (101) for connecting steel bars (3) to pass through, and a plurality of connecting steel bars (3) pass through the through holes (101); Floor slabs (6) are provided on both sides of the steel beam (2), and a plurality of mutually parallel longitudinal stress-bearing steel bars (4) are pre-embedded in the floor slabs (6), both ends of each longitudinal stress-bearing steel bar (4) extend out of the floor slab (6), and each longitudinal stress-bearing steel bar (4) corresponds to a connecting steel bar (3) coaxial therewith; The longitudinal stress-bearing steel bars (4) on each floor slab (6) are connected to the coaxial connecting steel bars (3) via a sleeve (5).

2. The prefabricated floor connection system according to claim 1, characterized in that: Both ends of the longitudinal stress-bearing steel bar (4) are provided with external threads, and the length of the external threads is L; both ends of the connecting steel bar (3) are provided with external threads, and the length of the external threads is L / 2; the sleeve (5) is provided with internal threads passing through both ends thereof, and the length of the sleeve (5) is L, L>0; the external threads of the longitudinal stress-bearing steel bar (4) and the connecting steel bar (3) are matched with the internal threads of the sleeve (5).

3. The prefabricated floor connection system according to claim 1, characterized in that: The width of the shear-resistant steel plate (1) is the same as the thickness of the floor slab (6); the steel beam (2) is an I-beam or an H-beam, and the web thickness of the steel beam (2) is the same as the thickness of the shear-resistant steel plate (1).

4. The prefabricated floor connection system according to claim 1, characterized in that: The outer diameter of the external threads at both ends of the connecting steel bar (3) is d2, the outer diameter of the external threads at both ends of the longitudinal stress-bearing steel bar (4) is d2, and the diameter of the middle section of the longitudinal stress-bearing steel bar (4) is d. , d>

0.

5. The assembly type prefabricated floor connection system according to claim 1, characterized in that: The through hole (101) is a regular hexagonal through hole, and the cross-section of the middle section of the connecting steel bar (3) is a regular hexagon, the side length of the regular hexagon is a, and a=d / 2.

6. The prefabricated floor connection system according to claim 1, characterized in that: The length L of the external threads at both ends of the longitudinal stress-bearing steel bars (4) is calculated as follows: Where: d1 is the inner diameter of the external threads at both ends of the longitudinal stress-bearing steel bar (4), in mm; d2 is the outer diameter of the external threads at both ends of the longitudinal stress-bearing steel bar (4), in mm; f y f is the tensile strength of the steel bar y , unit is MPa N / mm 2 ;f v f is the shear strength of the steel bar v , unit is MPa N / mm 2 .

7. The assembly type prefabricated floor connection system according to claim 1, characterized in that: The through holes (101) on the shear resistant steel plate (1) are arranged in a staggered manner.

8. A construction method for a prefabricated floor connection system according to claim 1, characterized in that: The following steps are involved: 1) vertically welding a shear steel plate (1) to the upper surface of a steel beam (2); wherein the longitudinal direction of the steel beam (2) is consistent with the length direction of the shear steel plate (1), and the shear steel plate (1) is provided with a plurality of through holes (101) for connecting steel bars (3) to pass through; 2) passing a plurality of the connecting steel bars (3) through the through holes (101); 3) hoisting two floor slabs (6) to both sides of the steel beam (2); wherein a plurality of mutually parallel longitudinal stress-bearing steel bars (4) are pre-embedded in the floor slab (6), both ends of each longitudinal stress-bearing steel bar (4) extend out of the floor slab (6), and each longitudinal stress-bearing steel bar (4) corresponds to a connecting steel bar (3) coaxial therewith; 4) rotating the sleeve (5) on the longitudinal stress-bearing steel bar (4) on each of the floor slabs (6) toward the connecting steel bar (3) and toward the shear steel plate (1); 5) pouring concrete at the connection between the floor slab (6) and the steel beam (2).

9. The construction method of the assembled prefabricated floor connection system according to claim 8, characterized in that: Before step 1), there is also a step of prefabricating the floor slab (6), the steps are as follows: 0-1) tying a plurality of steel meshes of floor slabs in a workshop, each steel mesh being tied with a plurality of longitudinal stress-bearing steel bars (4) parallel to each other, the axial directions of the plurality of longitudinal stress-bearing steel bars (4) being parallel to the mesh surface of the steel mesh, and both ends of the longitudinal stress-bearing steel bars (4) extending out of the steel mesh; 0-2) a plurality of connecting steel bars (3) are arranged between two adjacent steel mesh sheets, the two ends of each connecting steel bar (3) correspond to coaxial longitudinal stress-bearing steel bars (4), and the two ends of each connecting steel bar (3) are respectively connected to the longitudinal stress-bearing steel bars (4) on the two steel mesh sheets through sleeves (5); 0-3) pouring concrete on each of the steel meshes to form a floor slab (6), with both ends of the longitudinal force-bearing steel bars (4) extending out of the floor slab (6); 0-4) After the concrete strength reaches the standard, the sleeves (5) at the connection are rotated and moved towards the floor slab, and the connecting steel bars (3) are removed to separate the two mutually connected floor slabs (6); 0-5) Transporting the prefabricated floor slabs (6) to the construction site.

10. The construction method of the assembled prefabricated floor connection system according to claim 9, characterized in that: The two floor slabs (6) in step 3) are separated from steps 0-4).

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