Integral limiting device for prestress single-stage tensioning of nuclear power station
By designing an overall limiting device including a limiting plate body, annular surface, clip grooves and stranded wire holes, the loss problem of traditional extension devices on the limiting part of the nuclear power plant prestressing system is solved, and the effect of reducing losses and improving practicality is achieved.
Patent Information
- Application Number
- CN202421709431.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-18
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-18
AI Technical Summary
In the prestressing system of nuclear power plants, the traditional single-stage tensioning extension device acts directly on the anchor ring, which greatly loses the limit part of the top of the extension cylinder device.
An overall limiting device for prestressed single-stage tensioning in nuclear power plants is designed, including a limiting mechanism. The limiting mechanism consists of the main body of the limiting plate, annular surface, a clip groove and multiple stranded wire holes. The clip groove is adapted to the clip. The size of the groove needs to cover all steel strands in the prestressed ribs. The clip groove faces the anchor ring. The movement of the clip during the single-stage tensioning process will be limited to the depth of the groove. The main body of the limiting plate is made of metal material to have a certain compressive resistance.
By acting the single-stage tensioning extension device on the overall limiting device, setting the annular surface to cooperate with the anchor ring, the clip groove allows the clip to move during the tensioning of the steel strand wire harness, so that the steel strand can be pulled out, and limiting the exposed length of the clip, effectively reducing the loss of the limiting part at the top of the extension cylinder, and improving the practicality of the device.
Smart Images
Figure CN222909479U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of prestressed limiting plates in nuclear power plants, and specifically relates to an integral limiting device for single-stage tensioning of prestress in a nuclear power plant. Background Technique
[0002] Prestress is the compressive stress pre-applied to a structure during construction to improve its service performance. During the service period of the structure, the pre-applied compressive stress can completely or partially offset the tensile stress caused by the load, avoiding structural failure. It is commonly used in concrete structures.
[0003] In a prestressed concrete structure, pressure is pre-applied to it before the structure bears the load, so that the internal force of the concrete in the tensile zone during the action of the external load generates compressive stress, which is used to offset or reduce the tensile stress generated by the external load, so that the structure does not crack or cracks relatively late under normal use conditions. However, in the prestress system of a nuclear power plant, the traditional extension device for single-stage tensioning directly acts on the anchor ring, resulting in relatively large loss of the limiting part at the top of the extension cylinder device. Content of the Utility Model
[0004] The purpose of the utility model is to provide an integral limiting device for single-stage tensioning of prestress in a nuclear power plant, so as to solve the problem that in the prestress system of a nuclear power plant, the traditional extension device for single-stage tensioning directly acts on the anchor ring, resulting in relatively large loss of the limiting part at the top of the extension cylinder device.
[0005] To achieve the above purpose, the utility model provides the following technical solution: an integral limiting device for single-stage tensioning of prestress in a nuclear power plant, including a limiting mechanism;
[0006] The limiting mechanism includes a limiting plate main body, an annular surface, a collet groove and a plurality of strand holes. The annular surface is arranged at one end of the limiting plate main body. The collet groove is opened on the inner side of the annular surface. The strand holes are located on the inner side of the collet groove and penetrate through the limiting plate main body. A boss is integrally formed on the upper surface of the limiting plate main body, and a screw hole is opened on the boss. The collet groove is adapted to the collet, and the size of the groove needs to cover all the steel strands in the prestressed tendon. During use, the collet groove faces the anchor ring. During the single-stage tensioning process, the movement of the collet will be restricted within the depth dimension of the groove. The maximum distance allowed by the depth of the collet groove is 4.5 mm. The screw hole is provided to connect the thread of the lifting ring bolt for easy installation and on-site handling and hoisting. The limiting plate main body is made of a metal material to have a certain compressive capacity.
[0007] Preferably, the collet groove is a circular groove and is concentric with the annular surface. The collet groove on the limiting plate main body enables the collet to move.
[0008] Preferably, the main body of the limiting plate is cylindrical.
[0009] Preferably, the upper part of the boss is a flat surface, and the screw hole is located in the middle of the boss to cooperate with the thread of the eyebolt.
[0010] Preferably, a handhold is provided on the side of the main body of the limiting plate, and the provided handhold can facilitate the worker to hold the main body of the limiting plate.
[0011] Preferably, a total of fifty-five strand holes are provided. The number of strand holes is the same as the number of steel strands in the prestressing tendon, and the hole diameter is slightly larger than the diameter of the prestressing steel strand.
[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0013] In the present utility model, the single-stage tensioning extension device acts on the single-stage tensioning integral limiting device of the present device. The circular ring surface is provided to cooperate with the anchor ring, and the wedge-shaped clamp groove on the main body of the limiting plate allows the wedge-shaped clamp to move during the tensioning process of the steel strand bundle, so that the steel strand can be pulled out, and the exposed length of the wedge-shaped clamp is limited, effectively reducing the loss of the limiting part at the top of the extension cylinder and improving the practicability of the present device. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 Schematic three-dimensional structure of the present utility model Figure One ;
[0015] Figure 2 Schematic three-dimensional structure of the present utility model Figure Two ;
[0016] Figure 3 Schematic three-dimensional structure of the present utility model Figure Three .
[0017] In the figure: 1. Main body of the limiting plate; 2. Circular ring surface; 3. Wedge-shaped clamp groove; 4. Strand hole; 5. Boss; 6. Screw hole; 7. Handhold. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0019] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0020] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0021] Please refer to Figures 1 - 3 , the present utility model provides a technical solution: an integral limiting device for single-stage tensioning of prestress in a nuclear power plant, including a limiting mechanism;
[0022] The limiting mechanism includes a limiting plate main body 1, a circular ring surface 2, a wedge-shaped clamp groove 3, and a plurality of strand holes 4. The circular ring surface 2 is arranged at one end of the limiting plate main body 1. The wedge-shaped clamp groove 3 is opened on the inner side of the circular ring surface 2. The strand holes 4 are located on the inner side of the wedge-shaped clamp groove 3 and penetrate through the limiting plate main body 1. A boss 5 is integrally formed on the upper surface of the limiting plate main body 1, and a screw hole 6 is opened on the boss 5.
[0023] The wedge-shaped clamp groove 3 is adapted to the wedge-shaped clamp. The size of the groove needs to cover all the steel strands in the prestressed tendon. During use, the wedge-shaped clamp groove 3 faces the anchor ring. During the single-stage tensioning process, the movement of the wedge-shaped clamp will be limited within the depth dimension of the groove. The maximum distance allowed by the depth of the wedge-shaped clamp groove 3 is 4.5 mm. The screw hole 6 is provided to connect with the thread of the lifting ring bolt for easy installation and on-site handling and hoisting. The limiting plate main body 1 is made of metal material to have a certain compressive capacity.
[0024] Further, the wedge-shaped clamp groove 3 is a circular groove, and the wedge-shaped clamp groove 3 is concentrically arranged with the circular ring surface 2. The wedge-shaped clamp groove 3 on the limiting plate main body 1 enables the wedge-shaped clamp to move.
[0025] Further, the limiting plate main body 1 is cylindrical.
[0026] Further, the upper part of the boss 5 is a plane, and the screw hole 6 is located in the middle of the boss 5 to cooperate with the thread of the lifting ring bolt.
[0027] Furthermore, a handhold 7 is provided on the side of the main body 1 of the limit plate. The provided handhold 7 facilitates the worker to hold the main body 1 of the limit plate.
[0028] Furthermore, a total of fifty-five wire-stranding holes 4 are provided. The number of wire-stranding holes 4 is the same as the number of steel wire strands in the prestressed tendon. The diameter of the holes is slightly larger than the diameter of the prestressed steel wire strand.
[0029] In summary, when this device is in use, the nuclear power project adopts a non-bonded prestressed system and a construction method of grouting first and then tensioning. After the tendon threading is completed, the reserved length of the non-bonded prestressed steel wire strands in the prestressed duct is more than 1.2 m. There are fifty-five prestressed steel wire strands in each prestressed duct. To ensure the smooth completion of the tensioning of the steel wire strands, when the tensioning position is at a high altitude or in a place with a small space, a single-stage jack is used for the tensioning operation. The M16 bolt is connected through the screw hole 6 reserved on the side, and the limit device is installed. The clip groove 3 faces the direction of the anchor plate. All the fifty-five 1.2-m steel wire strands exposed outside the prestressed tendon pass through the fifty-five wire-stranding holes 4 reserved by the limit device. The circular ring surface 2 outside the clip groove 3 is in close contact with the anchor. The single-stage jack is installed at the other end of the main body 1 of the limit plate. After the tensioning starts, as the force of the single-stage jack continuously increases, the clip moves along with the movement of the steel wire strand. When the moving distance of the clip reaches the maximum distance allowed by the depth of the clip groove 3 of the limit device, the clip will be restricted and will no longer move along with the movement of the steel wire strand. When it comes to the final relaxation stage of the tensioning, the clip will retract along with the steel wire strand until the steel wire strand is locked. When the tensioning operations of all fifty-five steel wire strands are completed, the limit device can be disassembled.
[0030] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An integral limiter for prestressed single-stage tensioning in a nuclear power plant, characterized in that: Including limit mechanism; The limiting mechanism comprises a limiting plate body (1), an annular surface (2), a clamping groove (3) and a plurality of twisted wire holes (4); the annular surface (2) is arranged at one end of the limiting plate body (1); the clamping groove (3) is opened on the inner side of the annular surface (2); the twisted wire holes (4) are located on the inner side of the clamping groove (3); and the twisted wire holes (4) penetrate the limiting plate body (1); a boss (5) is integrally formed on the upper surface of the limiting plate body (1); and a screw hole (6) is opened on the boss (5).
2. The integral limiter for prestressed single-stage tensioning in a nuclear power plant according to claim 1, characterized in that: The clip groove (3) is a circular groove, and the clip groove (3) is arranged concentrically with the annular surface (2).
3. The integral limiter for prestressed single-stage tensioning in a nuclear power plant according to claim 1, characterized in that: The limiting plate body (1) is cylindrical.
4. The integral limiter for prestressed single-stage tensioning in a nuclear power plant according to claim 1, characterized in that: The top of the boss (5) is a plane, and the screw hole (6) is located in the middle of the boss (5).
5. The integral limiter for prestressed single-stage tensioning in a nuclear power plant according to claim 1, characterized in that: A hand position (7) is provided on the side of the limiting plate body (1).
6. The integral limiter for prestressed single-stage tensioning in a nuclear power plant according to claim 1, characterized in that: A total of fifty-five of the stranded wire holes (4) are provided.