Extension device for unbonded prestress tension of nuclear power station

Abstract

The utility model belongs to the technical field of engineering nuclear power prestress construction components, and particularly discloses an extension device for unbonded prestress tension of a nuclear power station, which comprises an extension cylinder and a limit cylinder, the limit cylinder is arranged at the end of the extension cylinder, and the extension cylinder comprises a bottom cylinder, a conical cylinder and a top cylinder which are integrally formed. The limiting cylinder is installed on the top column body, a spline is arranged on the outer side of the limiting cylinder, a first through wire twisting hole is formed in the middle of the extension cylinder, a second through wire twisting hole is formed in the middle of the limiting cylinder, and a clamping piece hole position is formed in the end, away from the extension cylinder, of the limiting cylinder. The first stranded wire hole and the second stranded wire hole are used for allowing a steel strand to penetrate through, the limiting barrel is used for being matched with a front clamping type single-stage jack, the end of the limiting barrel acts on the anchor ring, the diameter of the clamping piece hole position is larger than that of the clamping piece, and the depth of the clamping piece hole position meets the requirement that the clamping piece does not lock the steel strand in the steel strand tensioning process, so that the steel strand is stretched.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering nuclear power prestressed construction components, in particular to an extension device for non-bonded prestressed tensioning of a nuclear power station. Background Art

[0002] In the bonded prestressed system of the nuclear power plant, the prestressed tendons are made of bare steel strands, and the process of first tensioning and then grouting is adopted. The prestressing construction can only be carried out after the prestressing friction test results are qualified. After the construction of the prestressed main body of the bonded prestressed construction shell, the prestressing tensioning platform can be lifted to the inner dome position, and the tensioning adopts the overall tensioning method.

[0003] In the unbonded prestressed system, the prestressed tendons are made of steel strands with grease and sheaths, and the process of grouting first and then tensioning is adopted. The construction of the unbonded shell is carried out simultaneously with the construction of the prestressed main body. Each steel bundle consists of 55 strands, each of which is a 7-core steel strand with a nominal diameter of 15.7mm and grease and sheath. The distance between the two steel strands is small, and the single-stage jack cannot directly act on the root of the steel strand. This system requires the use of a special extension device for prestressed steel strand tensioning. However, there is a lack of corresponding extension devices for steel strand tensioning in nuclear power plants and related construction fields on the market. Utility Model Content

[0004] The utility model aims to provide a non-bonded prestressed tensioning extension device for a nuclear power plant to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an extension device for non-bonded prestressed tensioning in a nuclear power plant, comprising an extension cylinder and a limiting cylinder, wherein the limiting cylinder is arranged at the end of the extension cylinder;

[0006] The extension cylinder comprises an integrally formed bottom cylinder, a conical cylinder and a top cylinder, and the limiting cylinder is mounted on the top cylinder;

[0007] The outer side of the limit tube is provided with a spline, the middle of the extension tube is provided with a through first stranded wire hole, the middle of the limit tube is provided with a through second stranded wire hole, and the end of the limit tube away from the extension tube is provided with a clip hole;

[0008] The first strand hole and the second strand hole are used to pass the steel strand, the limit cylinder is used to cooperate with the front card type single-stage jack, the end of the limit cylinder acts on the anchor ring, the diameter of the clip hole is larger than the diameter of the clip, and the depth is sufficient to ensure that the clip does not lock the steel strand during the tensioning process of the steel strand, so that the steel strand is stretched.

[0009] As a preferred embodiment of the present invention, the first stranded wire hole and the second stranded wire hole belong to the same axis, and the first stranded wire hole and the second stranded wire hole have the same diameter.

[0010] As a preferred embodiment of the present invention, the limiting cylinder and the top column are detachably mounted to facilitate replacement of the limiting cylinder.

[0011] As a preferred embodiment of the utility model, a mounting groove is opened at one end of the base column, and a thread is arranged in the mounting groove, the mounting groove is used to fit with the front card type single-stage jack, and the extension tube is connected to the single-stage jack through a thread.

[0012] As a preferred embodiment of the utility model, a first screw hole is opened on the outside of the bottom column, a second screw hole is opened on the outside of the limiting cylinder, two first screw holes are provided, and one second screw hole is provided for installing bolt threads to facilitate lifting and movement.

[0013] As a preferred embodiment of the present invention, the extension tube and the limiting tube are both made of metal material to improve the pressure resistance.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model installs an extension cylinder on the jack, and then the limit cylinder at the end of the extension cylinder acts on the anchor ring, so that the extension device is located between the anchor and the single-stage jack. The extension device is light and flexible, easy to install, and can be widely used in prestressed single steel strand tensioning operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the side sectional structure of the utility model.

[0018] In the figure: 1, extension tube; 101, bottom cylinder; 102, cone cylinder; 103, top cylinder; 104, first strand hole; 105, mounting slot; 106, first screw hole;

[0019] 2. Limiting cylinder; 201. Second twisted wire hole; 202. Clip hole; 203. Second screw hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-2 The utility model provides a technical solution: an extension device for non-bonded prestressed tensioning in a nuclear power plant, comprising an extension cylinder 1 and a limiting cylinder 2, wherein the limiting cylinder 2 is arranged at the end of the extension cylinder 1;

[0024] The extension cylinder 1 includes an integrally formed bottom cylinder 101, a conical cylinder 102, and a top cylinder 103, and the limiting cylinder 2 is mounted on the top cylinder 103;

[0025] The outer side of the limiting tube 2 is provided with a spline, the middle of the extension tube 1 is provided with a through first strand hole 104, the middle of the limiting tube 2 is provided with a through second strand hole 201, and the end of the limiting tube 2 away from the extension tube 1 is provided with a clip hole 202;

[0026] The first strand hole 104 and the second strand hole 201 are used to pass the steel strand, the limit cylinder 2 is used to cooperate with the front card type single-stage jack, the end of the limit cylinder 2 acts on the anchor ring, the diameter of the clip hole 202 is larger than the diameter of the clip, and the depth is sufficient to ensure that the clip does not lock the steel strand during the tensioning process of the steel strand, so that the steel strand is stretched.

[0027] Furthermore, the first stranded wire hole 104 and the second stranded wire hole 201 belong to the same axis, and the first stranded wire hole 104 and the second stranded wire hole 201 have the same diameter.

[0028] Furthermore, the limiting cylinder 2 and the top column 103 are detachably mounted to facilitate replacement of the limiting cylinder 2 .

[0029] Furthermore, a mounting groove 105 is provided at one end of the bottom column 101, and the mounting groove 105 is used to fit with a front-clip single-stage jack, and the extension tube 1 is connected to the single-stage jack through threads.

[0030] Furthermore, a first screw hole 106 is opened on the outside of the bottom column 101, and a second screw hole 203 is opened on the outside of the limiting cylinder 2. There are two first screw holes 106 and one second screw hole 203. The first screw hole 106 and the second screw hole 203 are used to install bolt threads for easy lifting and movement.

[0031] Furthermore, the extension tube 1 and the limiting tube 2 are both made of metal materials to improve the pressure resistance.

[0032] In summary, when the utility model is in use, a mounting groove that matches the convex surface of the single-stage jack is set at the end of the extension tube 1, so that the extension tube 1 and the jack are connected together, and the limit tube 2 set together acts on the anchor ring to achieve normal operation. The device can be used as a single-strand tensioning device for prestressed steel strands. The device solves the problem that the distance between the two steel strands is small and the top of the single-stage jack cannot directly act on the anchor ring. The extension device is installed on the top of the jack. The top diameter of the device is small, and the plum blossom limit plate can directly act on the anchor ring. Between the anchor and the single-stage jack, the extension device is light, flexible, and easy to install. It can be widely used in prestressed single-strand tensioning operations.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-bonded prestressed tensioning extension device for a nuclear power plant, characterized in that: It comprises an extension tube (1) and a limiting tube (2), wherein the limiting tube (2) is arranged at the end of the extension tube (1); The extension cylinder (1) comprises an integrally formed bottom cylinder (101), a conical cylinder (102), and a top cylinder (103), and the limiting cylinder (2) is mounted on the top cylinder (103); The outer side of the limiting tube (2) is provided with a spline, the middle of the extension tube (1) is provided with a through first twisted wire hole (104), the middle of the limiting tube (2) is provided with a through second twisted wire hole (201), and the end of the limiting tube (2) away from the extension tube (1) is provided with a clip hole (202).

2. The extension device for non-bonded prestressed tensioning in a nuclear power plant according to claim 1, characterized in that: The first stranded wire hole (104) and the second stranded wire hole (201) belong to the same axis, and the first stranded wire hole (104) and the second stranded wire hole (201) have the same diameter.

3. The extension device for non-bonded prestressed tensioning in a nuclear power plant according to claim 1, characterized in that: The limiting cylinder (2) and the top column (103) are detachably mounted.

4. The extension device for non-bonded prestressed tensioning in a nuclear power plant according to claim 1, characterized in that: A mounting groove (105) is formed at one end of the bottom column (101).

5. The extension device for non-bonded prestressed tensioning in a nuclear power plant according to claim 1, characterized in that: A first screw hole (106) is provided on the outer side of the bottom column (101), and a second screw hole (203) is provided on the outer side of the limiting cylinder (2).

6. The extension device for non-bonded prestressed tensioning in a nuclear power plant according to claim 1, characterized in that: The extension tube (1) and the limiting tube (2) are both made of metal material.

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