A prestressed tendon

Abstract

The utility model discloses a prestressed reinforcement relates to building engineering technical field. Including prestressed reinforcement and the enlarged head of connection in prestressed reinforcement both ends. The utility model discloses a prestressed reinforcement through setting up the enlarged head at the end of prestressed reinforcement, can increase the anchorage stability of the floor with prestressed reinforcement, when the prestressed reinforcement is released, can reduce the shrinkage size of prestressed reinforcement relative floor, can effectively avoid the end broken condition of prestressed floor because of the shrinkage size of prestressed reinforcement when releasing is too big, and the convenient connection between floor, structural connection integrity is good.

Description

Technical Field

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

[0002] Existing prestressed hollow core slabs are single-layer, unidirectional prestressed steel reinforcement 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 steel bars 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] The existing SP prestressed floor slab has a complicated prestressing process. It applies prestress after the frame of the entire floor slab is spliced ​​together, and it cannot apply prestress to the spliced ​​floor slabs individually. As a result, the overall structural integrity is poor. Therefore, it is necessary to provide a prestressing tendon that can apply prestress to the floor slabs individually, and which is convenient to connect between floor slabs and has good structural integrity. Utility Model Content

[0016] The main purpose of this utility model is to provide a prestressed tendon 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 prestressing tendon includes a prestressing steel bar and enlarged ends connected to both ends of the prestressing steel bar.

[0019] Furthermore, the enlarged head is provided with external threads.

[0020] Furthermore, a lock nut is connected to one of the enlarged heads. The lock nut has a U-shaped structure and internal threads.

[0021] Furthermore, the lock nut is provided with an observation grouting hole.

[0022] Furthermore, the end of the enlarged head is provided with an internal threaded hole. A grooved tightening bolt is connected to the internal threaded hole of one enlarged head, and a conical tightening bolt is connected to the internal threaded hole of the other enlarged head. The grooved tightening bolt and the conical tightening bolt are compatible.

[0023] Furthermore, a threaded connection hole is provided on the enlarged head near the lock nut, and a connecting rod is threadedly connected to the threaded connection hole. The connecting rod passes through the lock nut and the two are connected.

[0024] Furthermore, a locking head is provided on the prestressed steel bar at the position corresponding to the end of the floor slab, and a locking clamp is provided at the end of the floor slab, wherein the locking head is adapted to the locking clamp.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention can increase the anchorage force between the end of the prestressing tendon and the building structure, and can connect the prestressing tendons on adjacent floor slabs. The connection between 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 tendon relative to the floor slab is smaller when the prestressing tendon is released. The concrete structure at the end of the floor slab is not easily damaged, making the building structure more stable. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a prestressed tendon in Example 1.

[0028] Figure 2 This is a side view of a floor slab with prestressed tendons installed in Example 1.

[0029] Figure 3 This is a plan view of the floor slab with prestressed tendons installed in Example 1.

[0030] Figure 4 This is a schematic diagram of the connection between the floor slab with prestressed tendons and the precast beam in Example 1.

[0031] Figure 5 for Figure 4 Top view of section A.

[0032] Figure 6 This is a schematic diagram of a prestressed tendon in Example 2.

[0033] Figure 7 This is a side view of a floor slab with prestressed tendons installed in Example 2.

[0034] Figure 8 This is a schematic diagram of a prestressed tendon in Example 3.

[0035] Figure 9 This is a side view of a floor slab with prestressed tendons installed in Example 3.

[0036] Figure 10 This is a schematic diagram showing the connection between the floor slab with prestressed tendons and the precast beam in Example 3.

[0037] Figure 11 This is a schematic diagram of the lock nut and enlarged head in the first combination structure of Embodiment 3.

[0038] Figure 12 This is a connection diagram of the first combined structure in Example 3.

[0039] Figure 13 This is a side view of the floor slab using the first type of combined prestressed tendons in Example 3.

[0040] Figure 14 This is a schematic diagram of the prestressed tendons using the second combined structure in Example 3.

[0041] Figure 15 This is a schematic diagram of the prestressed tendons using the third combined structure in Example 3.

[0042] Figure 16 This is a schematic diagram of a prestressed tendon in Example 4.

[0043] Figure 17 This is a schematic diagram of the slotted top tightening bolt and the cone top tightening bolt in Example 4.

[0044] Figure 18 This is a schematic diagram showing the connection between the floor slab with prestressed tendons and the precast beam in Example 4.

[0045] Figure 19 This is a schematic diagram of a prestressed tendon in Example 5.

[0046] Figure 20 This is a schematic diagram of a prestressed tendon in Example 6.

[0047] Figure 21 This is a side view of a floor slab with prestressed tendons installed in Example 6.

[0048] Among them, 1-prestressed steel bar; 2-enlarged head; 3-floor slab; 4-lock nut; 5-precast beam; 6-observation grouting hole; 7-groove top tightening bolt; 8-cone top tightening bolt; 9-threaded connection hole; 10-connecting rod; 11-locking head; 12-locking clamp. Detailed Implementation

[0049] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0050] Example 1

[0051] Combination Figure 1-5 As shown, this embodiment provides a prestressed tendon, including a prestressed steel bar 1 and enlarged heads 2 connected to both ends of the prestressed steel bar 1.

[0052] By setting the enlarged head 2, the anchorage between the end of the prestressed steel bar 1 and the precast beam is more stable. After the floor slab with prestressed steel bar 1 and enlarged head 2 is connected to the precast beam 5, the anchorage between the enlarged head 2 and the precast beam 5 is more stable, which increases the anchorage stability of the floor slab with prestressed tendons. When the prestressed steel bar 1 is released, the shrinkage distance relative to the floor slab is smaller, and the concrete structure at the end of the floor slab is not easily damaged, making the building structure more stable.

[0053] Multiple prestressed steel bars 1 can be installed inside the floor slab.

[0054] Example 2

[0055] This embodiment provides a prestressed tendon, including a prestressed steel bar 1 and enlarged heads 2 connected to both ends of the prestressed steel bar 1, wherein the enlarged heads 2 are provided with external threads.

[0056] Compared to the prestressed tendon disclosed in Embodiment 1, the prestressed tendon disclosed in this embodiment has an external thread on the enlarged head 2 that can further increase the anchorage stability between the prestressed steel bar 1 and the precast beam 5.

[0057] Example 3

[0058] This embodiment provides a prestressed tendon, including a prestressed steel bar 1 and enlarged heads 2 connected to both ends of the prestressed steel bar 1. One enlarged head 2 is provided with an external thread, and the other enlarged head 2 is connected with a lock nut 4. The lock nut 4 has a U-shaped structure and is provided with an internal thread.

[0059] The lock nut 4 is provided with an observation grouting hole 6, which serves to observe the tightening of the steel bar joint, the quality of the connection, and the grouting during concrete pouring.

[0060] The prestressing tendons disclosed in this embodiment can be connected in multiple ways. By connecting the enlarged head with external threads of one prestressing tendon to the lock nut of another prestressing tendon, a mechanical connection between two adjacent prestressing tendons can be achieved, thereby improving the overall stability of the building.

[0061] This embodiment provides three specific combination structures of the lock nut and the enlarged head, and any one of the various specific combination structures can be applied to any embodiment.

[0062] The first combination structure of lock nut and enlarged head is as follows Figure 11-13 As shown, the internal bend of the U-shaped lock nut 4 is an oblique angle structure. The height of the enlarged head located near the lock nut 4 is equal to the distance between the two oblique angle structures. The enlarged head located away from the nut is adapted to the lock nut 4, and the two can be threaded together.

[0063] The second combination structure of the lock nut and the enlarged head is as follows: Figure 14 As shown, the internal angle of the U-shaped lock nut 4 is an oblique angle structure, and one end of the lock nut is provided with a lock hole. The end of the lock hole is flush with the side of the two oblique angle structures that are close to each other. The enlarged head provided near the lock nut 4 is a pointed conical structure. The tip of the enlarged head passes through the lock hole, and the part that does not pass through the lock hole is engaged with the oblique angle structure. It can be mechanically connected to the lock nut of the prestressing tendon by the enlarged head of another prestressing tendon, thereby improving the overall stability of the building.

[0064] The third combination structure of lock nut and enlarged head is as follows Figure 15 As shown, its difference from the second combined structure is that the enlarged head 2 with the pointed conical structure adopts a split structure, which includes a clamp and a post connected by threads. The post is used to pass through the lock hole, and the clamp is used to engage with the beveled structure.

[0065] Example 4

[0066] like Figure 16-18 As shown, this embodiment provides a prestressed tendon, including a prestressed steel bar 1 and enlarged heads 2 connected to both ends of the prestressed steel bar 1. One enlarged head 2 is provided with an external thread, and the other enlarged head 2 is connected with a lock nut 4. The lock nut 4 has a U-shaped structure and is provided with an internal thread.

[0067] The lock nut 4 is provided with an observation grouting hole 6, which facilitates the observation of the connection and grouting status.

[0068] The end of the enlarged head 2 is provided with an internal threaded hole. A grooved tightening bolt 7 is connected to the internal threaded hole of one enlarged head, and a conical tightening bolt 8 is connected to the internal threaded hole of the other enlarged head. The grooved tightening bolt 7 and the conical tightening bolt 8 are compatible with each other.

[0069] Using the prestressed tendon disclosed in this embodiment, by connecting the enlarged head 2 and the lock nut 4 between two adjacent prestressed tendons, the conical tightening bolt 8 and the groove tightening bolt 7 are connected, resulting in high connection accuracy and convenient connection.

[0070] The enlarged head 2 and the lock nut 4 can be directly connected by threads, or they can be indirectly connected by a threaded sleeve that is snapped into the enlarged head 2 and threadedly connected to the lock nut of another prestressing tendon.

[0071] Example 5

[0072] like Figure 19 As shown, this embodiment provides a prestressed tendon, including a prestressed steel bar 1 and enlarged heads 2 connected to both ends of the prestressed steel bar 1. One enlarged head 2 is provided with an external thread, and the other enlarged head 2 is connected with a lock nut 4. The lock nut 4 has a U-shaped structure and is provided with an internal thread.

[0073] The lock nut 4 is provided with an observation grouting hole 6, which facilitates the observation of the connection and grouting status.

[0074] A threaded connection hole 9 is provided on the enlarged head 2 near the lock nut 4. A connecting rod 10 is threadedly connected to the threaded connection hole 9. The connecting rod 10 passes through the lock nut and the two are connected.

[0075] The lock nut 4 is connected to the enlarged head 2 by the connecting rod 10. The connection method is simple. Furthermore, the connection between prestressing tendons can be achieved by threading the enlarged head 2 of one prestressing tendon to the lock nut of another prestressing tendon.

[0076] Example 6

[0077] like Figure 20-21 As shown, this embodiment provides a prestressed tendon, including a prestressed steel bar 1 and enlarged heads 2 connected to both ends of the prestressed steel bar 1. One enlarged head 2 is provided with an external thread, and the other enlarged head 2 is connected with a lock nut 4. The lock nut 4 has a U-shaped structure and is provided with an internal thread.

[0078] The lock nut 4 is provided with an observation grouting hole 6, which facilitates the observation of the connection and grouting status.

[0079] A locking head 11 is provided on the prestressed steel bar at the position corresponding to the end of the floor slab, and a locking clamp 12 is provided at the end of the floor slab. The locking head 11 and the locking clamp 12 are adapted to each other.

[0080] By limiting the locking clamp 12 by locking head 11, the shrinkage distance of prestressed steel bar 1 can be effectively controlled when the prestressed tendon is released, and the concrete structure at the end of the floor slab is not easily damaged, making the building structure more stable.

[0081] 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 tendon, characterized in that, Includes prestressed steel bars and enlarged ends connected to both ends of the prestressed steel bars; The enlarged head is provided with external threads; One of the enlarged heads is connected to a lock nut, which has a U-shaped structure and internal threads.

2. A prestressed tendon as described in claim 1, characterized in that, The lock nut is provided with an observation grouting hole.

3. A prestressed tendon as described in claim 1, characterized in that, The end of the enlarged head is provided with an internal threaded hole. A grooved tightening bolt is connected to the internal threaded hole of one enlarged head, and a conical tightening bolt is connected to the internal threaded hole of the other enlarged head. The grooved tightening bolt and the conical tightening bolt are compatible.

4. A prestressed tendon as described in claim 1, characterized in that, A threaded connection hole is provided on the enlarged head near the lock nut, and a connecting rod is threaded onto the threaded connection hole. The connecting rod passes through the lock nut and the two are connected.

5. A prestressed tendon as described in claim 1, characterized in that, A locking head is provided on the prestressed steel bar at the position corresponding to the end of the floor slab, and a locking clamp is provided at the end of the floor slab. The locking head is adapted to the locking clamp.

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