Nuclear power station unbonded prestressed duct sealing device

Abstract

The utility model belongs to the technical field of engineering sealing, and particularly discloses a nuclear power station unbonded prestressed duct sealing device which comprises an O-shaped ring, a pressure-bearing sealing special-shaped plate, a rubber pad, a pressure-bearing sealing flat plate and an anchor backing plate, the pressure-bearing sealing special-shaped plate is provided with a convex surface and a concave surface, the anchor backing plate is arranged on one side of the convex surface of the pressure-bearing sealing special-shaped plate, and the rubber pad is arranged on the convex surface of the pressure-bearing sealing special-shaped plate. A hole matched with the convex face is formed in the anchor bearing plate, a sealing groove is formed in the outer side of the convex face, the O-shaped ring is embedded in the sealing groove, the rubber pad is matched with the concave face, the pressure-bearing sealing flat plate is arranged on the side, away from the pressure-bearing sealing special-shaped plate, of the rubber pad, and the O-shaped ring is stressed to generate elastic deformation after being installed. The pre-tightening pressure is provided for the unbonded prestressed duct sealing device, the sealing performance of the end face of the anchor backing plate is ensured, the rubber pad is extruded to be elastically deformed, and the PE sheath of the unbonded prestressed steel strand is wrapped by the rubber layer, so that the sealing of the steel strand at the outlet of the prestressed duct is ensured.

Description

Technical Field

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

[0002] A nuclear power plant is a facility that converts nuclear energy into electrical energy through appropriate devices. A nuclear power plant uses a nuclear reactor to replace the boiler of a thermal power plant. Nuclear fuel is burned in a special form in the nuclear reactor to generate heat, which converts nuclear energy into thermal energy to heat water and produce steam.

[0003] In the bonded prestressed system of nuclear power plants, the prestressed tendons are made of bare steel strands, and the process of tensioning first and then grouting is adopted. After the tensioning is completed, the steel strands are cut short, and the grouting cover bolts are connected to the anchor plate using sealing rings and closed sealing devices. Grouting is then carried out after the holes and steel strands are sealed.

[0004] However, 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 reserved length of the unbonded prestressed steel strands is relatively long. This system requires the use of a special prestressed channel sealing device. At present, there is a lack of corresponding channel sealing devices in the market for nuclear power plants and related construction fields. Utility Model Content

[0005] The utility model aims to provide a non-bonded prestressed duct sealing device for a nuclear power plant to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a non-bonded prestressed duct sealing device for a nuclear power plant, comprising an O-ring, a pressure-bearing sealing shaped plate, a rubber pad, a pressure-bearing sealing flat plate and an anchor plate, wherein the pressure-bearing sealing shaped plate is provided with a convex surface and a concave surface, the anchor plate is arranged on one side of the convex surface of the pressure-bearing sealing shaped plate, the anchor plate is provided with holes matching the convex surface, a sealing groove is arranged on the outer side of the convex surface, the O-ring is embedded in the sealing groove, the rubber pad cooperates with the concave surface, the pressure-bearing sealing flat plate is arranged on the side of the rubber pad away from the pressure-bearing sealing shaped plate, the O-ring is elastically deformed under force after installation, and a pre-tightening pressure is provided to the non-bonded prestressed duct sealing device, thereby ensuring the sealing of the end face of the anchor plate, the O-ring is made of a material with good wear resistance and toughness, and the rubber pad is made of a material without gaps and with good elasticity.

[0007] Preferably, the surfaces of the pressure-bearing sealing special-shaped plate, the rubber pad and the pressure-bearing sealing flat plate are all provided with holes for passing the unbonded prestressed steel strands.

[0008] Preferably, the diameter of the O-ring is the same as the diameter of the sealing groove of the pressure-bearing sealing shaped plate, and the thickness of the O-ring is greater than the depth of the sealing groove of the pressure-bearing sealing shaped plate.

[0009] Preferably, the side edge of the concave surface of the pressure-bearing sealing shaped plate is provided with a limiting convex point, and the side surface of the rubber pad is provided with a concave point corresponding to the convex point, so as to prevent the rubber pad from rotating and deviating during installation and use.

[0010] Preferably, the pressure-bearing sealing special-shaped plate is connected and fixed to the pressure-bearing sealing flat plate by screws, and the screws are arranged one every 120° to adjust the extrusion degree of the rubber pad. The rubber pad structure is squeezed to cause it to undergo elastic deformation, and the rubber pad is used to tightly wrap the PE sheath of the unbonded prestressed steel strand to ensure the sealing of the steel strand at the outlet of the prestressed channel.

[0011] Preferably, the pressure-bearing sealing shaped plate and the pressure-bearing sealing flat plate are connected to the anchor plate by bolts, and the bolts are arranged every 60°. The O-ring is deformed by the tightening pressure of the bolts, and after the pressure-bearing sealing shaped plate and the pressure-bearing sealing flat plate are fixed, the pressure-bearing sealing shaped plate and the pressure-bearing sealing flat plate are fixed to the anchor plate by bolts.

[0012] Preferably, a lifting eye bolt thread and four lifting ears are provided on the side of the pressure-bearing sealing special-shaped plate for installation of prestressed tendons in the horizontal direction and on-site transportation and lifting.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model arranges a rubber pad between a pressure-bearing sealing special-shaped plate and a pressure-bearing sealing flat plate, squeezes the rubber pad to make it elastically deformed, and uses the rubber layer to tightly wrap the PE sheath of the non-bonded prestressed steel strand to ensure the sealing of the steel strand at the outlet of the prestressed channel; provides pre-tightening pressure to the non-bonded prestressed channel sealing device by arranging an O-ring to ensure the sealing of the end face of the anchor pad; and facilitates installation and on-site transportation and lifting by means of the eyebolt threads and the lifting ears on the pressure-bearing sealing special-shaped plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the convex structure of the pressure-bearing sealing special-shaped plate of the utility model;

[0018] Figure 4 This is a schematic diagram of the concave structure of the pressure-bearing sealing special-shaped plate of the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the rubber pad of the utility model.

[0020] In the figure: 1, O-ring; 2, pressure-bearing sealing shaped plate; 201, convex surface; 202, concave surface; 203, sealing groove; 204, eyebolt thread; 205, lifting ear; 206, convex point; 3, rubber pad; 301, concave point; 4, pressure-bearing sealing flat plate; 5, anchor plate. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See also Figure 1-5 The utility model provides a technical solution: a non-bonded prestressed duct sealing device for a nuclear power plant, comprising an O-ring 1, a pressure-bearing sealing shaped plate 2, a rubber pad 3, a pressure-bearing sealing flat plate 4 and an anchor plate 5, wherein the pressure-bearing sealing shaped plate 2 is provided with a convex surface 201 and a concave surface 202, the anchor plate 5 is arranged on one side of the convex surface 201 of the pressure-bearing sealing shaped plate 2, a hole matching the convex surface 201 is arranged on the anchor plate 5, a sealing groove 203 is arranged on the outer side of the convex surface 201, the O-ring 1 is embedded in the sealing groove 203, the rubber pad 3 cooperates with the concave surface 202, the pressure-bearing sealing flat plate 4 is arranged on the side of the rubber pad 3 away from the pressure-bearing sealing shaped plate 2, the O-ring 1 is subjected to elastic deformation under force after installation, and provides pre-tightening pressure to the non-bonded prestressed duct sealing device, ensuring the sealing of the end face of the anchor plate 5, the O-ring is made of a material with good wear resistance and toughness, and the rubber pad 3 is made of a material without gaps and with good elasticity.

[0025] Furthermore, the surfaces of the pressure-bearing sealing special-shaped plate 2, the rubber pad 3, and the pressure-bearing sealing flat plate 4 are all provided with holes for passing the unbonded prestressed steel strands.

[0026] Furthermore, the diameter of the O-ring is the same as the diameter of the sealing groove 203 of the pressure-bearing sealing shaped plate 2 , and the thickness of the O-ring is greater than the depth of the sealing groove 203 of the pressure-bearing sealing shaped plate 2 .

[0027] Furthermore, the side of the concave surface 202 of the pressure-bearing sealing shaped plate 2 is provided with a limiting protrusion 206, and the side of the rubber pad 3 is provided with a concave point 301 corresponding to the protrusion, which is used to prevent the rubber pad 3 from rotating and deviating during installation and use.

[0028] Furthermore, the pressure-bearing sealing special-shaped plate 2 is fixed to the pressure-bearing sealing flat plate 4 by screws, and the screws are arranged one every 120° to adjust the extrusion degree of the rubber pad 3. The rubber pad 3 is elastically deformed by squeezing the structure, and the rubber pad 3 is used to wrap the PE sheath of the unbonded prestressed steel strand to ensure the sealing of the steel strand at the outlet of the prestressed channel.

[0029] Furthermore, the pressure-bearing sealing shaped plate 2 and the pressure-bearing sealing flat plate 4 are connected to the anchor plate 5 by bolts, and the bolts are arranged one every 60°. The O-ring is deformed by the tightening pressure of the bolts, and after the pressure-bearing sealing shaped plate 2 and the pressure-bearing sealing flat plate 4 are fixed, the pressure-bearing sealing shaped plate 2 and the pressure-bearing sealing flat plate 4 are fixed to the anchor plate 5 by bolts.

[0030] Furthermore, a lifting eye bolt thread 204 and four lifting ears 205 are provided on the side of the pressure-bearing sealing special-shaped plate 2 for installation of prestressed tendons in the horizontal direction and on-site transportation and lifting.

[0031] In summary, the nuclear power project in this embodiment adopts a non-bonded prestressed system, and adopts a construction method of grouting first and then tensioning. After the bundle is completed, the reserved length of the non-bonded prestressed steel strands in the prestressed duct is more than 1.2m. There are 55 prestressed steel strands in each prestressed duct, each of which is composed of 7-core steel strands with grease and sheath with a nominal diameter of 15.7mm. To ensure the sealing of the prestressed duct during grouting.

[0032] By embedding the rubber pad 3 into the concave surface 202 of the pressure-bearing sealing shaped plate 2, and making the limiting convex point 206 correspond to the concave point 301, the rubber pad 3 is prevented from rotating and deviating during installation, and then the pressure-bearing sealing shaped plate 2 and the pressure-bearing sealing flat plate 4 are fixed with screws. At the same time, the pressure-bearing sealing flat plate 4 squeezes the rubber pad 3-layer structure to make it elastically deformed, and the rubber layer is used to tightly wrap the PE sheath of the 55 unbonded prestressed steel strands passing through to ensure the sealing of the steel strands at the outlet of the prestressed channel, the O-ring 1 is installed in the sealing groove 203, and then the convex surface 201 is fit into the hole of the anchor plate 5, and then the pressure-bearing sealing shaped plate 2 and the pressure-bearing sealing flat plate 4 are fixed to the anchor plate 5 with bolts, and the friction between the O-ring and the end face of the anchor plate 5 is increased by the tightening pressure of the bolts to ensure the sealing of the end face of the anchor plate 5.

[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 duct sealing device for a nuclear power plant, characterized in that: The invention comprises an O-ring (1), a pressure-bearing sealing shaped plate (2), a rubber pad (3), a pressure-bearing sealing flat plate (4) and an anchor pad (5); the pressure-bearing sealing shaped plate (2) is provided with a convex surface (201) and a concave surface (202); the anchor pad (5) is arranged on one side of the convex surface (201) of the pressure-bearing sealing shaped plate; a hole is arranged on the anchor pad (5) to fit with the convex surface (201); a sealing groove (203) is arranged on the outer side of the convex surface (201); the O-ring (1) is embedded in the sealing groove (203); the rubber pad (3) fits with the concave surface (202); and the pressure-bearing sealing flat plate (4) is arranged on the side of the rubber pad (3) away from the pressure-bearing sealing shaped plate (2).

2. A non-bonded prestressed duct sealing device for a nuclear power plant according to claim 1, characterized in that: The surfaces of the pressure-bearing sealing special-shaped plate (2), the rubber pad (3) and the pressure-bearing sealing flat plate (4) are all provided with holes for passing the unbonded prestressed steel strands.

3. A non-bonded prestressed duct sealing device for a nuclear power plant according to claim 1, characterized in that: The diameter of the O-ring is the same as the diameter of the sealing groove (203) of the pressure-bearing sealing shaped plate (2), and the thickness of the O-ring is greater than the depth of the sealing groove (203) of the pressure-bearing sealing shaped plate (2).

4. A non-bonded prestressed duct sealing device for a nuclear power plant according to claim 1, characterized in that: The side edge of the concave surface (202) of the pressure-bearing sealing shaped plate (2) is provided with a limiting convex point (206), and the side surface of the rubber pad (3) is provided with a concave point (301) corresponding to the convex point.

5. The non-bonded prestressed duct sealing device for a nuclear power plant according to claim 1, characterized in that: The pressure-bearing sealing shaped plate (2) and the pressure-bearing sealing flat plate (4) are connected and fixed by means of screws, and the pressure-bearing sealing shaped plate (2) and the pressure-bearing sealing flat plate (4) are connected to the anchor plate (5) by means of bolts.

6. The non-bonded prestressed duct sealing device for a nuclear power plant according to claim 1, characterized in that: A lifting eye bolt thread (204) and four lifting ears (205) are provided on the side of the pressure-bearing sealing special-shaped plate (2).

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