Prestressed space truss floor

Abstract

The utility model discloses a prestressed net rack floor relates to building engineering technical field. Including main part, the inside of main part is provided with screen and prestressed reinforcement. The utility model discloses a prestressed net rack floor sets up screen and prestressed reinforcement, makes floorboard and floorboard, floorboard and beam overlap, and the structural connection integrity of building is better, through setting up the enlarged head at the end of prestressed reinforcement, can increase the anchoring stability of floorboard with prestressed reinforcement, when the tensioning of prestressed reinforcement, can reduce the shrinkage size of prestressed reinforcement relative floorboard, can effectively avoid the end broken condition that prestressed floorboard is caused by the shrinkage size of prestressed reinforcement when tensioning is too big, and the connection between floorboard is convenient.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, specifically to a prestressed space frame floor slab. Background Technology

[0002] Existing prestressed hollow core slabs are single-layer, unidirectional prestressed tendon structures, with the SP prestressed hollow core slab being a representative example.

[0003] SP prestressed hollow core slabs have the following advantages:

[0004] 1. Large spans can be achieved (existing technology for SP prestressed hollow core slabs can produce lengths of up to 18 meters);

[0005] 2. Because the center of the floor slab is not subjected to stress, the hollow structure reduces the amount of concrete used, thereby reducing the self-weight of the floor slab and the overall self-weight of the building;

[0006] 3. The high tensile strength of prestressed concrete and the tensioning effect of prestress significantly improve the load-bearing capacity of floor slabs;

[0007] 4. The tensile stress generated by prestressing effectively prevents the common quality problem of concrete cracking;

[0008] 5. The hollow structure reduces material usage and lowers material costs;

[0009] 6. Fully prefabricated components eliminate the need for on-site integral concrete pouring, making installation convenient, quick, and efficient.

[0010] 7. The long-line automated extrusion molding production process has high production efficiency.

[0011] SP prestressed hollow core slabs have the following disadvantages:

[0012] 1. The floor slabs lack connecting bars on all four sides. The lap joints between floor slabs and between floor slabs and beams are not connected by connecting bars, resulting in poor overall structural integrity and failing to meet the seismic design requirements for multi-story and high-rise buildings, especially residential buildings.

[0013] 2. The slab surface arches due to the prestressing tensile stress, resulting in poor flatness and requiring a finishing layer for leveling.

[0014] 3. Prestressed tendons lose their tensile stress and fail to bear the load when subjected to high temperatures during fire; compared to ordinary reinforced concrete structures, their fire resistance time is shorter.

[0015] Since there are no connecting bars on the four sides of the floor slab, the lap splicing of floor slabs with each other and with beams is poor in terms of overall structural integrity due to the lack of connecting bars. Therefore, it is necessary to provide a prestressed space frame floor slab that is easy to connect between floor slabs and has good overall structural integrity. Utility Model Content

[0016] The main purpose of this utility model is to provide a prestressed space frame floor slab to solve the problems existing in the prior art.

[0017] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0018] A prestressed grid floor slab includes a main body, wherein the main body is provided with grid panels and prestressing tendons.

[0019] Furthermore, the ends of the mesh and the prestressed tendons are provided with hooks.

[0020] Furthermore, the adjacent ends of the mesh and the prestressed tendon are fixedly connected.

[0021] Furthermore, the mesh is provided in two sets, and the two sets of mesh are connected by web reinforcement to form a mesh frame, and the prestressed tendons are connected to the mesh frame.

[0022] Furthermore, hooks are provided at each end of both sets of mesh panels;

[0023] Alternatively, the adjacent ends of two sets of mesh panels can be connected to form a closed opening.

[0024] Furthermore, a set of prestressing tendons is provided, and the set of prestressing tendons is connected to a set of mesh sheets.

[0025] Furthermore, the prestressing tendons are provided in two sets, with each set of the mesh connected to one set of prestressing tendons.

[0026] Furthermore, the ends of the prestressed tendons are provided with diverging steel wires.

[0027] Furthermore, the ends of the prestressed tendons are provided with enlarged heads.

[0028] Furthermore, one of the enlarged heads of the prestressing tendon is provided with an external thread, and the other enlarged head is a composite connection structure. The composite connection structure is provided with an internal thread groove, and the two prestressing tendons of the adjacent main body are threadedly connected to the composite connection structure through the enlarged head provided with the external thread.

[0029] Furthermore, the composite connection structure includes a lock nut and an inner connector. The lock nut has an internal thread groove, and the end of the internal thread groove near the prestressing tendon has a snap-fit ​​groove that matches the inner connector. An enlarged head with external threads is threadedly connected to the lock nut, and the enlarged head with external threads abuts against the inner connector.

[0030] Furthermore, one enlarged head is provided with an external thread, and the other enlarged head is connected with a lock nut. The lock nut has a U-shaped structure and an internal thread. One end of the enlarged head with the external thread is provided with an internal threaded hole. A tightening bolt is threadedly connected to the internal threaded hole. The two prestressing tendons of the adjacent main body are connected to the lock nut by the external threaded enlarged head, and the end of the tightening bolt abuts against the enlarged head with the lock nut.

[0031] Furthermore, the enlarged head connected to the lock nut is provided with a tapered hole, and the end of the tightening bolt away from the thread is a tapered structure, with the tapered end of the tightening bolt abutting against the tapered hole.

[0032] Furthermore, a sleeve is connected to one enlarged head, and a lock nut is connected to the other enlarged head. The lock nut has a U-shaped structure and internal threads. The enlarged head connected to the lock nut has a tapered hole. External threads are provided on the outer wall of the sleeve. A tightening bolt is connected to the internal thread of the sleeve. The end of the tightening bolt away from the sleeve has a tapered structure. The lock nut is threadedly connected to the sleeve, and the tapered structure of the tightening bolt abuts against the tapered hole.

[0033] Furthermore, one enlarged head is provided with an external thread, and the other enlarged head is provided with an internal thread hole. The internal thread hole of the enlarged head is internally threaded to a connecting rod. The end of the connecting rod away from the enlarged head is connected to a lock nut. The lock nut has a U-shaped structure and is internally threaded. Two adjacent main bodies are connected by an enlarged head with an external thread and the lock nut, and the enlarged head with an external thread abuts against the connecting rod.

[0034] Furthermore, a fireproof layer is connected to one side of the main body.

[0035] Furthermore, a decorative layer is attached to one side of the main body.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] By setting mesh and prestressing tendons inside the main structure, with the mesh extending through the main structure at all four ends and the prestressing tendons also extending through the main structure, the floor slabs can overlap with each other and with the beams, resulting in good overall structural integrity of the building. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the prestressed space frame floor slab in Example 1.

[0039] Figure 2 This is a schematic diagram of the end of the prestressed space frame floor slab in Example 1.

[0040] Figure 3This is a side view of the prestressed space frame floor slab in Example 2.

[0041] Figure 4 This is a schematic diagram showing that the ends of the prestressed space frame floor slab in Example 3 are closed.

[0042] Figure 5 This is a schematic diagram showing the end of the prestressed space frame floor slab in Example 3 as a hook.

[0043] Figure 6 This is a schematic diagram of the web reinforcement of the prestressed space frame floor slab in Example 3.

[0044] Figure 7 This is a side view of the prestressed space frame floor slab with enlarged heads in Example 6.

[0045] Figure 8 This is a schematic diagram of the connection between the prestressed space frame floor slab with enlarged head and the precast beam in Example 6.

[0046] Figure 9 This is a schematic diagram of the prestressed space frame floor slab in Example 7.

[0047] Figure 10 This is a side view of the prestressed space frame floor slab in Example 7.

[0048] Figure 11 This is a schematic diagram of the connection between the prestressed space frame floor slab and the precast beam in Example 7.

[0049] Figure 12 This is a schematic diagram of the prestressed space frame floor slab in Example 8.

[0050] Figure 13 This is a schematic diagram of the connection between the prestressed space frame floor slab and the precast beam in Example 8.

[0051] Figure 14 This is a schematic diagram of a prestressed space frame floor slab in Example 8, which is abutted by a top-tightening bolt with a tapered structure.

[0052] Figure 15 This is a schematic diagram of the connection between the prestressed space frame floor slab and the precast beam in Example 8, where they are abutted by top-tightening bolts with a tapered structure.

[0053] Figure 16 This is a schematic diagram of the prestressed space frame floor slab in Example 9.

[0054] Figure 17 This is a schematic diagram of the prestressed tendon connection between the two prestressed space frame floor slabs in Example 9.

[0055] Figure 18 This is a schematic diagram of the connection between the prestressed space frame floor slab and the precast beam in Example 9.

[0056] Figure 19 This is a schematic diagram of the prestressed space frame floor slab in Example 10.

[0057] Figure 20 This is a schematic diagram of the prestressed tendon connection between the two prestressed space frame floor slabs in Example 10.

[0058] Figure 21 This is a schematic diagram of the connection between the prestressed space frame floor slab and the precast beam in Example 10.

[0059] Figure 22 This is a schematic diagram of the prestressed space frame floor slab in Example 11.

[0060] Figure 23 This is a schematic diagram of the prestressed tendon connection between the two prestressed space frame floor slabs in Example 11.

[0061] Figure 24 This is a schematic diagram of the connection between the prestressed space frame floor slab and the precast beam in Example 11.

[0062] Figure 25 This is a schematic diagram of a prestressed space frame floor slab with a fireproof layer and a decorative layer in Example 12.

[0063] Among them, 1-main body; 2-mesh; 3-prestressed tendon; 4-space frame; 5-web reinforcement; 6-closed end; 7-divergent wire; 8-enlarged head; 9-composite connection structure; 91-lock nut; 92-inner connector; 10-tightening bolt; 11-sleeve; 12-tapered bolt; 13-connecting rod; 14-fireproof layer; 15-decorative layer; 16-precast floor slab; 17-precast beam. Detailed Implementation

[0064] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0065] Example 1

[0066] Combination Figure 1-2 This utility model provides a prestressed grid floor slab, including a main body 1. The main body 1 is provided with a mesh 2 and prestressing tendons 3. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1, which facilitates the overlapping and pouring between adjacent main bodies 1.

[0067] As an optimization, hooks are provided at the ends of the mesh 2 and the prestressed tendon 3 to increase the stability of the overlap.

[0068] The present invention discloses a prestressed grid floor slab, which sets a mesh 2 and prestressing tendons 3 inside the main body 1. The four ends of the mesh 2 all penetrate through the main body 1, and the ends of the prestressing tendons 3 also penetrate through the main body 1, so that the floor slabs can overlap with each other and the floor slabs can overlap with the beams, resulting in good structural integrity of the building.

[0069] The prestressed space frame floor slab can be used for connection with precast floor slabs 16 and precast beams 17.

[0070] Example 2

[0071] The difference between this embodiment and Embodiment 1 is that, Figure 3 As shown, the ends of the mesh 2 and the prestressed tendon 3 are tied together with stirrups, which can increase the structural stability of the floor slab.

[0072] Example 3

[0073] A type of prestressed space frame floor slab, such as Figure 4-6 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0074] The mesh 2 is provided in two sets, and the two sets of mesh 2 are connected by the web reinforcement 5 to form a mesh frame 4. The web reinforcement 5 can be vertical web reinforcement or diagonal web reinforcement. The prestressed tendons 3 are connected to the mesh frame 4. The mesh frame 4 formed by the double-layer mesh 2 can further improve the stability of the floor slab.

[0075] Each end of the two sets of mesh panels 2 is equipped with a hook, which can increase the stability of the overlap.

[0076] In some other embodiments, the adjacent ends of the two sets of mesh panels 2 are connected to form a closed opening 6, which can increase the structural stability of the mesh frame 4.

[0077] In this embodiment, a set of prestressing tendons 3 is provided, and a set of prestressing tendons 3 is connected to a set of mesh sheets 2.

[0078] Example 4

[0079] The difference between this embodiment and embodiment three is that the prestressing tendons 3 are provided in two sets, and each set of the mesh 2 is connected to a set of prestressing tendons 3, which is used to increase the prestress that the overall structure can provide.

[0080] In some other embodiments, the prestressing tendons 3 may be provided in two or more sets.

[0081] Example 5

[0082] A prestressed grid floor slab includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and pouring of adjacent main bodies 1.

[0083] The end of the prestressing tendon 3 is connected to a diverging steel wire, which can increase the stress on the prestressing tendon 3.

[0084] Example 6

[0085] A type of prestressed space frame floor slab, such as Figure 7-8 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0086] The end of the prestressing tendon 3 is provided with an enlarged head 8, which can increase the anchoring force of the prestressing tendon 3 after casting.

[0087] Example 7

[0088] A type of prestressed space frame floor slab, such as Figure 9-11 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0089] The end of the prestressing tendon 3 is provided with an enlarged head 8, which can increase the anchoring force of the prestressing tendon 3 after casting.

[0090] One of the enlarged heads 8 of the prestressing tendon 3 is provided with an external thread, and the other enlarged head 8 is a composite connection structure 9. The composite connection structure 9 is provided with an internal thread groove. The two prestressing tendons 3 of the adjacent main body 1 are connected to the composite connection structure 9 by the enlarged head 8 provided with the external thread.

[0091] The composite connection structure 9 includes a lock nut 91 and an inner connector 92. The lock nut 91 has an internal thread groove, and the end of the internal thread groove near the prestressing tendon 3 has a snap-fit ​​groove that matches the inner connector 92. An enlarged head 8 with external threads is threadedly connected to the lock nut 91, and the enlarged head 8 with external threads abuts against the inner connector 92.

[0092] The connection of prestressing tendons between floor slabs is achieved by using an enlarged head 8 with external threads in conjunction with a composite connection structure 9. The connection between floor slabs is convenient, the integrity of components and the integrity of structural connections are good, and the shrinkage distance of the prestressing tendons relative to the floor slabs is smaller when the prestressing tendons are released. The concrete structure at the end of the main body 1 is not easily damaged, making the building structure more stable.

[0093] Example 8

[0094] A type of prestressed space frame floor slab, such as Figure 12-13 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0095] The end of the prestressed tendon 3 is provided with an enlarged head 8.

[0096] One enlarged head 8 is provided with an external thread, and the other enlarged head is connected with a lock nut 91. That is, the lock nut 91 and the adjacent enlarged head 8 form a composite connection structure 9. The lock nut 91 is a U-shaped structure and is provided with an internal thread. One end of the enlarged head 8 with external thread is provided with an internal threaded hole. A tightening bolt 10 is threadedly connected to the internal threaded hole. The two prestressing tendons 3 of the adjacent main body 1 are threadedly connected to the lock nut 91 through the enlarged head 8 with external thread, and the end of the tightening bolt 10 abuts against the enlarged head 8 with lock nut 91.

[0097] As an optimization, such as Figure 14-15 As shown, in some other embodiments, the enlarged head 8 connected to the lock nut 91 is provided with a tapered hole, and the end of the tightening bolt 10 away from the thread is a tapered structure. The tapered end of the tightening bolt 10 abuts against the tapered hole, making the abutment between the tightening bolt 10 and the enlarged head 8 more stable.

[0098] In this embodiment, the prestressing tendons between floor slabs are connected by the expansion head 8 with external threads and the composite connection structure 9. The tightening bolts 10 make the connection more compact, which facilitates the connection between floor slabs, improves the integrity of components and the overall integrity of structural connection, and makes the shrinkage distance of the prestressing tendons relative to the floor slab smaller when they are released. The concrete structure at the end of the main body 1 is not easily damaged, making the building structure more stable.

[0099] Example 9

[0100] A type of prestressed space frame floor slab, such as Figure 16-18 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0101] The end of the prestressed tendon 3 is provided with an enlarged head 8.

[0102] A sleeve 11 is connected to one enlarged head 8, and a lock nut 91 is connected to the other enlarged head. The lock nut 91 has a U-shaped structure and internal threads. The enlarged head 8 connected to the lock nut 91 has a tapered hole. The outer wall of the sleeve 11 has external threads. The internal thread of the sleeve 11 is connected to a tightening bolt 10. The end of the tightening bolt 10 away from the sleeve 11 has a tapered structure. The lock nut 91 is threadedly connected to the sleeve 11, and the tapered structure of the tightening bolt 10 abuts against the tapered hole.

[0103] By setting up sleeve 11 and lock nut 9 to connect with each other, the prestressing tendons between the two floor slabs are connected, and the tightening bolt 10 makes the connection more compact. The connection between the floor slabs is convenient, the integrity of the components and the integrity of the structural connection are good, and the shrinkage distance of the prestressing tendons relative to the floor slab is smaller when the prestressing tendons are released. The concrete structure at the end of the main body 1 is not easily damaged, making the building structure more stable.

[0104] Example 10

[0105] A type of prestressed space frame floor slab, such as Figure 19-21 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0106] The end of the prestressed tendon 3 is provided with an enlarged head 8.

[0107] A sleeve 11 is connected to one enlarged head 8, and a lock nut 91 is connected to the other enlarged head. The lock nut 91 has a U-shaped structure and an internal thread. An external thread is provided on the outer wall of the sleeve 11. A tightening bolt 10 is connected to the internal thread of the sleeve 11. The end of the tightening bolt 10 away from the sleeve 11 has a tapered structure. The lock nut 91 is threadedly connected to the sleeve 11.

[0108] An internal threaded hole is provided on the enlarged head 8 connected to the lock nut 91. A tapered bolt 12 is threaded onto this internal threaded hole, and the tapered bolt 12 abuts against the tapered structure of the tightening bolt 10.

[0109] By setting up sleeve 11 and lock nut 9 to connect with each other, the prestressing tendons between the two floor slabs are connected. The tightening bolt 10 and tapered bolt 12 make the connection more compact. The connection between the floor slabs is convenient, the integrity of the components and the integrity of the structural connection are good. At the same time, the shrinkage distance of the prestressing tendons relative to the floor slab is smaller when the prestressing tendons are released. The concrete structure at the end of the main body 1 is not easily damaged, making the building structure more stable.

[0110] Example 11

[0111] A type of prestressed space frame floor slab, such as Figure 22-24 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0112] The end of the prestressed tendon 3 is provided with an enlarged head 8.

[0113] One enlarged head 8 has an external thread, and the other enlarged head 8 has an internal thread. The internal thread of the enlarged head 8 is connected to a connecting rod 13. The end of the connecting rod 13 away from the enlarged head 8 is connected to a lock nut 91. The lock nut 91 has a U-shaped structure and an internal thread. Two adjacent main bodies 1 are connected by an enlarged head 8 with an external thread and the lock nut 91, and the enlarged head 8 with an external thread abuts against the connecting rod 13.

[0114] Between two adjacent floor slabs, one enlarged head 8 is threadedly connected to the other enlarged head 8 through the connection rod 13 and the lock nut 91, thereby connecting the prestressing tendons between the two floor slabs. The connection between the floor slabs is convenient, the integrity of the components and the integrity of the structural connection are good, and at the same time, the shrinkage distance of the prestressing tendons relative to the floor slab is smaller when the prestressing tendons are released. The concrete structure at the end of the main body 1 is not easily damaged, making the building structure more stable.

[0115] This invention can increase the anchorage force between the ends of prestressed tendons and the building structure, and can connect prestressed tendons on adjacent floor slabs.

[0116] Example 12

[0117] A type of prestressed space frame floor slab, such as Figure 25 As shown, it includes a main body 1, inside which a mesh 2 and prestressing tendons 3 are provided. The ends of the mesh 2 and the prestressing tendons 3 extend out of the main body 1 to facilitate the overlapping and casting between adjacent main bodies 1.

[0118] A fireproof layer 14 is connected to one side of the main body 1, which can increase the fire resistance of the floor slab.

[0119] A decorative layer 15 is connected to one side of the main body 1. After the floor slab is connected, the installation and connection of the decorative layer can be completed directly, making the connection of the decorative layer 15 more convenient and improving construction efficiency.

[0120] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A prestressed space frame floor slab, characterized in that, Includes a main body, the interior of which is provided with a mesh and prestressed tendons; The ends of the prestressed tendons are provided with enlarged heads; The prestressing tendon has an external thread on one of its enlarged ends, and the other enlarged end is a composite connection structure with an internal thread groove. The two prestressing tendons of the adjacent main body are connected to the composite connection structure by the external threaded enlarged ends. Alternatively, one enlarged head is provided with an external thread, and the other enlarged head is connected with a lock nut. The lock nut has a U-shaped structure and an internal thread. One end of the enlarged head with the external thread is provided with an internal thread hole. A tightening bolt is threadedly connected to the internal thread hole. Two prestressing tendons of adjacent main bodies are connected to the lock nut through the enlarged head with the external thread and the lock nut. The end of the tightening bolt abuts against the enlarged head with the lock nut. Alternatively, a sleeve is connected to one enlarged head, and a lock nut is connected to the other enlarged head. The lock nut has a U-shaped structure and internal threads. The enlarged head connected to the lock nut has a tapered hole. External threads are provided on the outer wall of the sleeve. A tightening bolt is connected to the internal thread of the sleeve. The end of the tightening bolt away from the sleeve has a tapered structure. The lock nut is threaded to the sleeve, and the tapered structure of the tightening bolt abuts against the lock nut. Alternatively, one enlarged head is provided with an external thread, and the other enlarged head is provided with an internal thread hole. The internal thread hole of the enlarged head is connected to a connecting rod. The end of the connecting rod away from the enlarged head is connected to a lock nut. The lock nut has a U-shaped structure and is provided with an internal thread. Two adjacent main bodies are connected to each other by an enlarged head with an external thread and the lock nut, and the enlarged head with an external thread abuts against the connecting rod.

2. The prestressed space frame floor slab as described in claim 1, characterized in that, The ends of the mesh and the prestressed tendons are provided with hooks.

3. A prestressed space frame floor slab as described in claim 1, characterized in that, The adjacent ends of the mesh and the prestressed tendon are fixedly connected.

4. A prestressed space frame floor slab as described in claim 1, characterized in that, The mesh is provided in two sets, and the two sets of mesh are connected by web reinforcement to form a mesh frame. The prestressed tendons are connected to the mesh frame.

5. A prestressed space frame floor slab as described in claim 4, characterized in that, Hooks are provided at each end of both sets of mesh panels; Alternatively, the adjacent ends of two sets of mesh panels can be connected to form a closed opening.

6. A prestressed space frame floor slab as described in claim 5, characterized in that, The prestressing tendons are provided in a set, and the set of prestressing tendons is connected to the set of mesh sheets.

7. A prestressed space frame floor slab as described in claim 5, characterized in that, The prestressing tendons are provided in two sets, and each set of the mesh is connected to one set of prestressing tendons.

8. A prestressed space frame floor slab as described in claim 1, characterized in that, The ends of the prestressed tendons are provided with diverging steel wires.

9. A prestressed space frame floor slab as described in claim 1, characterized in that, When one end of the prestressing tendon is provided with an external thread and the other end of the prestressing tendon is a composite connection structure, the composite connection structure includes a lock nut and an inner connector. The lock nut is provided with an internal thread groove, and the end of the internal thread groove near the prestressing tendon is provided with a snap-fit ​​groove that is adapted to the inner connector. The externally threaded enlarged head is threadedly connected to the lock nut, and the externally threaded enlarged head abuts against the inner connector.

10. A prestressed space frame floor slab as described in claim 1, characterized in that, When one enlarged head is provided with an external thread and the other enlarged head is connected with a lock nut, the enlarged head connected with the lock nut is provided with a tapered hole, and the end of the tightening bolt away from the thread is a tapered structure, and the end of the tightening bolt with the tapered structure abuts against the tapered hole.

11. A prestressed space frame floor slab as described in claim 1, characterized in that, A fireproof layer is connected to one side of the main body.

12. A prestressed space frame floor slab as described in claim 1, characterized in that, A decorative layer is attached to one side of the main body.

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