A basement flat beam slab structure roof prestressed tendon lap joint structure

Abstract

This application discloses a prestressed tendon lap splicing structure in a flat beam slab roof structure of a basement, relating to the technical field of basement roof slabs. It aims to solve the problem that when pouring basement roof slabs, external machines are needed to pull the prestressed tendons, but finding the direction of force on these machines is cumbersome and inefficient. The key technical points are: it includes two flat beam slabs and prestressed tendons built into the flat beam slabs. Before pouring the basement roof slab, a cap steel plate is installed between and above the two flat beam slabs. The cap steel plate includes two connecting plates, a top plate, and two inclined side plates. Jacks are fixed to the two inclined side plates, each jack including a screw rod. A fixing component for fixing the prestressed tendons is provided at the end of the screw rod away from the jack. The fixing component includes a clamp handle, a clamp, a bolt, and a nut; thus achieving the pulling of the prestressed tendons. This effectively solves the problem of finding the direction of force on external machines and the low efficiency.

Description

Technical Field

[0001] This application relates to the field of basement roof slab technology, and in particular to a prestressed tendon lap splice structure in a basement flat beam slab roof slab. Background Technology

[0002] After half a century of development, prestressed technology has become a very important technology in civil engineering due to its advantages such as large span, material saving, good crack resistance, and structural safety and reliability. In the construction of the top slab of the flat beam structure of the basement, since the basement is generally a very long building, the prestressing tendons will also be too long, which requires the prestressing tendons to be spliced ​​in sections.

[0003] The existing basement flat beam slab structure with prestressed tendon lap joints includes two flat beams, prestressed tendons embedded within the flat beams, and tension caps positioned above the two flat beams. In the lap joints of the prestressed tendons in adjacent segments, the lap end of the prestressed tendon on the left side should extend upwards into the right side wall of the tension cap, and the lap end of the prestressed tendon on the right side should extend upwards into the left side wall of the cap steel plate. Cap steel plates are required during the forming of the tension caps. External machinery is needed to pull the prestressed tendons during the pouring of the basement roof slab.

[0004] Regarding the aforementioned technologies, the inventors believe that when pouring the basement roof slab, it is necessary to use an external machine to pull the prestressing tendons. However, finding and fixing the force direction of the external machine is troublesome, inefficient, and time-consuming. Utility Model Content

[0005] The purpose of this application is to provide a prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure to solve the problem that it is troublesome and inefficient to find the direction of force on the external machine.

[0006] This application provides a technical solution for the lap splicing structure of prestressed tendons in the top slab of a basement flat beam-slab structure, which adopts the following technical solution: A prestressed tendon lap splicing structure in the top slab of a basement flat beam slab structure includes two flat beam slabs and prestressed tendons built into the flat beam slabs; characterized in that: a cap steel plate is provided between and above the two flat beam slabs, the cap steel plate includes two connecting plates, a top plate, and two inclined side plates, the inclined side plates are provided with through holes for the prestressed tendons to pass through, fixing plates are fixed on the outer surfaces of both sides of the inclined side plates, jacks are provided on the fixing plates, the jacks include screws, and a fixing component for fixing the prestressed tendons is provided at the end of the screws away from the jacks.

[0007] By adopting the above technical solution, when pouring the basement roof slab, it is no longer necessary to use external machines to pull the prestressing tendons. The prestressing tendons can be pulled by the pier cap steel plate, jacks and fixing components, and it is no longer necessary to find the direction of force of the external machine for fixing.

[0008] Optionally, the fixing assembly includes a chuck handle, two chucks, a bolt, and a nut; one end of the two chucks is fixed to the same end of the chuck handle, and the other end of the two chucks has a fixing hole for inserting a bolt.

[0009] By adopting the above technical solution, when the prestressing tendon is placed between the two clamps, the bolts are inserted into the two fixing holes and fixed with nuts to achieve the fixing of the prestressing tendon.

[0010] Optionally, the inner wall of the chuck is provided with a hardness pad.

[0011] By adopting the above technical solution, the hardness pad can protect the chuck from wear.

[0012] Optionally, the inner wall of the hardness pad is provided with clamping protrusions.

[0013] By adopting the above technical solution, the friction between the prestressing tendon and the rigid plate can be increased, preventing slippage between the prestressing tendon and the rigid plate when the prestressing tendon is pulled, which would affect the casting quality.

[0014] Optionally, the inner wall of the chuck is provided with a fixing groove, and the outer wall of the hardness pad is provided with a fixing protrusion that mates with the fixing groove.

[0015] By adopting the above technical solution, the fixing protrusion on the outer wall of the hardness pad is inserted into the fixing groove on the inner wall of the clamp, thereby fixing the hardness pad and allowing it to be disassembled at any time. This enables personnel to replace and install the hardness pad at any time when it is severely worn.

[0016] Optionally, the bottom wall of the fixing groove is provided with a first magnetic element, and the end of the fixing protrusion located inside the fixing groove is provided with a second magnetic element that is magnetically attracted to the first magnetic element.

[0017] By adopting the above technical solution, when the fixing protrusion is inserted into the fixing groove, the first magnetic component fixed on the bottom wall of the fixing groove and the second magnetic component fixed in the fixing protrusion attract each other, reinforcing the fixing protrusion and the fixing groove, and preventing displacement between the hardness pad and the clamp when pulling the prestressing tendon, which would affect the pulling of the prestressing tendon.

[0018] Optionally, both the inclined side plate and the fixing plate are provided with insertion holes, and the bottom wall of the jack is provided with a fixing rod that can be inserted into the insertion hole.

[0019] By adopting the above technical solution, the jack is fixed to the inclined side plate of the pier cap steel plate, and the jack can be disassembled at any time, which facilitates the protection of the jack during transportation.

[0020] Optionally, a third magnetic element is provided on the bottom wall of the insertion hole, and a fourth magnetic element is provided at one end of the insertion rod located inside the insertion hole, which is magnetically attracted to the third magnetic element.

[0021] By adopting the above technical solution, when the insertion rod is inserted into the insertion hole, the third magnetic component fixed on the bottom wall of the insertion hole and the fourth magnetic component fixed on the insertion rod attract each other, reinforcing the insertion rod and the insertion hole, and preventing the jack and the inclined side plate of the pier cap steel plate from shifting when the prestressing tendon is pulled, thus affecting the pouring.

[0022] Optionally, a hardness ring tube is provided on the inner wall of the through hole.

[0023] By adopting the above technical solution, the rigid ring tube can protect the through hole and prevent the prestressing tendon from exerting a large force on the through hole when pulling the prestressing tendon, thus preventing the through hole from deforming.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By installing a pier cap steel plate on the upper surface of the flat beam plate and the tensioning pier cap, the pier cap steel plate includes two connecting plates, a top plate, and two inclined side plates. Through holes for prestressing tendons are provided through the inclined side plates. Fixing plates are fixed to the outer surfaces of both sides of the inclined side plates, and jacks are installed on the fixing plates. Each jack includes a screw rod, and a fixing component for fixing the prestressing tendons is installed at the end of the screw rod away from the jack. This eliminates the need for external machinery when pulling prestressing tendons, solving the problems of cumbersome and inefficient methods of finding and fixing the force direction of external machinery.

[0025] 2. The inner wall of the chuck is provided with a hardening pad and a fixing groove. The outer wall of the hardening pad is provided with a fixing protrusion that mates with the fixing groove. The hardening pad can protect the chuck from wear, and personnel can replace it at any time when the hardening pad is severely worn. 3. The inner wall of the hardness pad is provided with clamping protrusions, which can increase the friction between the prestressing tendon and the hardness pad, and prevent the prestressing tendon from slipping and affecting the casting quality when pulling the prestressing tendon.

[0026] 4. A rigid ring tube is installed on the inner wall of the through hole to protect the through hole and prevent the prestressing tendon from exerting a large force on the through hole when it is pulled, which would cause the through hole to deform. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the cross-section of the prestressed tendons in the top slab of the cast-in-place flat beam slab structure.

[0028] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0029] Figure 3 This is a schematic diagram of the fixing components that hold the prestressed tendons.

[0030] Figure 4 This is a schematic diagram of a bolt and nut clamp.

[0031] Figure 5 yes Figure 4 Enlarged view of section B.

[0032] In the diagram, 1. Flat beam plate; 2. Jack; 3. Tensioning cap; 4. Cap steel plate; 7. Prestressing tendon; 8. Screw rod; 11. Insertion hole; 12. Insertion rod; 13. Clamp handle; 14. Clamp; 16. Fixing hole; 17. Bolt; 18. Nut; 19. Fixing protrusion; 20. Fixing groove; 21. Clamping protrusion; 22. First magnetic component; 23. Second magnetic component; 24. Through hole; 25. Hardening ring tube; 26. Fixing plate; 27. Hardening pad; 28. Top plate; 29. ​​Inclined side plate; 30. Fixing assembly; 31. Third magnetic component; 32. Fourth magnetic component; 33. Connecting plate. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail below.

[0034] A prestressed tendon lap splice structure in the top slab of a basement flat beam-slab structure, referring to Figure 1 It includes two flat beams 1 and prestressing tendons 7 built into the flat beams 1; a tensioning cap 3 is set between and above the two flat beams 1. A cap steel plate 4 is required in the process of forming the tensioning cap 3. The cap steel plate 4 is set on the upper surface of the flat beams 1 and the tensioning cap 3. The cap steel plate 4 is made of low carbon steel. The cap steel plate 4 includes two connecting plates 33, a top plate 28, and two inclined side plates 29. The inclined side plates 29 are provided with through holes 24 for the prestressing tendons 7 to pass through. Fixing plates 26 are fixed to the outer surfaces of both sides of the inclined side plates 29 by welding. The fixing plates 26 are made of low alloy steel with greater hardness. A jack 2 is set on the fixing plate 26. The jack 2 is a spiral jack 2. The jack 2 includes a screw 8. A fixing component 30 for fixing the prestressing tendons 7 is set at the end of the screw 8 away from the jack 2.

[0035] Reference Figure 3 and Figure 4The fixing component 30 includes a chuck handle 13, two chucks 14, a bolt 17, and a nut 18. One end of the two chucks 14 is fixed to the same end of the chuck handle 13, and the other end of the two chucks 14 is provided with fixing holes 16 for inserting bolts 17. The prestressing tendon 7 is placed between the two chucks 14, the bolts 17 are inserted into the two fixing holes 16, and then the nut 18 is put on the bolts 17 and tightened to fix the prestressing tendon 7.

[0036] Reference Figure 3 The inner wall of the chuck 14 is provided with a hardness pad 27, which is also made of low alloy steel with greater hardness; this can protect the chuck 14. The inner wall of the hardness pad 27 is provided with a clamping protrusion 21, which is made of the same material as the hardness pad 27 and is integrally formed; this can increase the friction between the hardness pad 7 and the prestressing tendon 7 and prevent slippage between the prestressing tendon 7 and the hardness pad 27 when the prestressing tendon 7 is pulled.

[0037] Reference Figure 5 The inner wall of the chuck 14 is provided with a fixing groove 20, and the outer wall of the hardness pad 27 is fixed with a fixing protrusion 19 that mates with the fixing groove 20 by welding. The fixing protrusion 19 and the hardness pad 27 are made of the same low alloy steel to facilitate the replacement and installation of the hardness pad 27.

[0038] Reference Figure 5 The bottom wall of the fixing groove 20 is fixed with a first magnetic element 22 by screws. The end of the fixing protrusion 19 located inside the fixing groove 20 is fixed with a second magnetic element 23 that is magnetically attracted to the first magnetic element 22 by screws. The fixing protrusion 19 and the fixing groove 20 are reinforced to prevent displacement between the hardness pad 27 and the clamp 14 when the prestressing tendon 7 is pulled. The first magnetic element 22 and the second magnetic element 23 are both magnets.

[0039] Reference Figure 2 Both the inclined side plate 29 and the fixed plate 26 are provided with insertion holes 8. The bottom wall of the jack 2 is fixed with a insertion rod 12 that is inserted into the insertion hole 8 by welding; this allows the jack 2 to be disassembled, which is convenient for protecting the jack 2 during transportation.

[0040] Reference Figure 2 The bottom wall of the insertion hole 8 is fixed with a third magnetic component 31 by screws. The end of the insertion rod 12 located inside the insertion hole 8 is fixed with a fourth magnetic component 32 that is magnetically attracted to the third magnetic component 31 by screws. The insertion rod 12 and the insertion hole 8 are reinforced to prevent the jack 2 and the inclined side plate 29 of the pier cap steel plate 4 from shifting when the prestressing tendon 7 is pulled. Both the third magnetic component 31 and the fourth magnetic component 32 are magnets.

[0041] Reference Figure 1The inner wall of the through hole 24 is fixed with a hardened ring tube 25 by welding. The hardened ring tube 25 is made of low alloy steel. It can protect the through hole 24 and prevent the prestressed tendon 7 from exerting a large force on the through hole 24 when it is pulled, thus preventing the through hole 24 from deforming.

[0042] The implementation principle of this application embodiment is as follows: Before pouring the basement roof slab, one end of the prestressed tendon 7 is placed between two clamps 14. At this time, bolts 17 are inserted into the two corresponding fixing holes 16. Nuts 1818 are then placed on the bolts 17 and tightened. Jack 2 is activated, and the screw 8 moves upward. The fixing component 30 fixed to the screw 8 also moves upward. The clamps 14 in the fixing component 30 clamp the prestressed tendon 7 and pull it. When the prestressed tendon 7 is pulled to a suitable degree, jack 2 is turned off, keeping the prestressed tendon 7 in this tensile state. This solves the problem of the cumbersome and inefficient process of finding the direction of force on the external machine.

[0043] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure, comprising two flat beam slabs (1) and prestressed tendons (7) embedded inside the flat beam slabs (1); characterized in that: A pier cap steel plate (4) is provided between and above the two flat beam plates (1). The pier cap steel plate (4) includes two connecting plates (33), a top plate (28), and two inclined side plates (29). The inclined side plates (29) are provided with through holes (24) for the prestressing tendons (7) to pass through. Fixing plates (26) are fixed on the outer surfaces of both sides of the inclined side plates (29). A jack (2) is provided on the fixing plate (26). The jack (2) includes a screw (8). A fixing component (30) for fixing the prestressing tendons (7) is provided at the end of the screw (8) away from the jack (2).

2. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 1, characterized in that: The fixing component (30) includes a chuck handle (13), two chucks (14), a bolt (17), and a nut (18). One end of the two chucks (14) is fixed to the same end of the chuck handle (13), and the other end of the two chucks (14) is provided with a fixing hole (16) for inserting the bolt (17).

3. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 2, characterized in that: The inner wall of the chuck (14) is provided with a hardness pad (27).

4. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 3, characterized in that: The inner wall of the hardness pad (27) is provided with clamping protrusions (21).

5. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 3, characterized in that: The inner wall of the chuck (14) is provided with a fixing groove (20), and the outer wall of the hardness pad (27) is provided with a fixing protrusion (19) that cooperates with the fixing groove (20).

6. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 5, characterized in that: The bottom wall of the fixing groove (20) is provided with a first magnetic element (22), and the fixing protrusion (19) located inside the fixing groove (20) is provided with a second magnetic element (23) that is magnetically attracted to the first magnetic element (22).

7. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 1, characterized in that: Both the inclined side plate (29) and the fixed plate (26) are provided with insertion holes (11), and the bottom wall of the jack (2) is provided with a fixing rod (12) that can be inserted into the insertion hole (11).

8. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 7, characterized in that: The bottom wall of the insertion hole (11) is provided with a third magnetic element (31), and the end of the insertion rod (12) located inside the insertion hole (11) is provided with a fourth magnetic element (32) that is magnetically attracted to the third magnetic element (31).

9. The prestressed tendon lap splice structure in the top slab of a basement flat beam slab structure according to claim 1, characterized in that: The inner wall of the through hole (24) is provided with a hardness ring tube (25).

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