Double-sided composite foot-free sealing gasket capable of expanding when meeting water

Abstract

The utility model relates to the technical field of shield tunnel engineering, in particular to a double-faced composite foot-free sealing gasket capable of expanding when meeting water, which comprises a gasket body, a mounting groove is arranged on the surface of the gasket body, a penetrating opening is arranged on the wall of the mounting groove, an inserting rod is inserted in the penetrating opening in a sliding manner, a mounting plate is fixedly mounted at one end of the inserting rod, and the other end of the inserting rod is fixedly connected with the mounting plate. The inserting rod is connected with the groove wall of the mounting groove through a first telescopic part; sliding grooves are symmetrically and horizontally formed in the cushion body, two through openings communicating with the two sliding grooves correspondingly are formed in the groove wall of the mounting groove, sliding rods are slidably inserted into the through openings, trapezoidal clamping blocks are fixedly installed at the ends, located in the mounting groove, of the sliding rods, and pull blocks are fixedly installed at the ends, located in the sliding grooves, of the sliding rods. The sliding rod is connected with the groove wall of the mounting groove through a second telescopic component, and the side wall of the inserting rod is provided with a clamping opening for the clamping block to enter. A plurality of pad bodies can be spliced together for use, the disassembly and assembly steps are extremely simple, and the practicability of the pad bodies is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shield tunnel engineering, in particular to a double-sided composite water-expandable footless sealing pad. Background Art

[0002] Due to the advantages of automated shield machine construction, prefabricated segment assembly, and adaptability to a wide range of strata, shield tunnels are widely used in cross-river and cross-sea transportation projects. At present, the majority of domestic shield tunnel segment joint waterproof sealing gasket materials are made of EPDM rubber. In view of the strong acid resistance and other stability of EPDM rubber and the advancement of rubber processing technology, composite water-swellable rubber and EPDM rubber have been invented, and embedded composite sealing gaskets and co-extruded composite sealing gaskets have appeared.

[0003] The thickness of the existing produced sealing gaskets without foot portions is constant, and a plurality of sealing gaskets without foot portions cannot be quickly spliced ​​together for use, so the practicability is poor. Utility Model Content

[0004] The purpose of the utility model is to solve the following shortcomings in the prior art: the thickness of the existing footless sealing gaskets is constant, and multiple footless sealing gaskets cannot be quickly spliced ​​together for use, which has poor practicality. A double-sided composite water-swellable footless sealing gasket is proposed.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A double-sided composite water-expandable footless sealing pad, comprising a pad body, an EPDM rubber pad on the pad body surface, an installation groove on the pad body surface, a through hole on the installation groove wall, an insertion rod slidably inserted in the through hole, a mounting plate fixedly mounted on one end of the insertion rod, and the insertion rod connected to the installation groove wall through a first telescopic component;

[0007] The pad body is symmetrically and horizontally provided with sliding grooves, and the installation groove wall is provided with two through openings respectively connected with the two sliding grooves, a sliding rod is slidably inserted in the through opening, a trapezoidal block is fixedly installed at one end of the sliding rod located in the installation groove, a pulling block is fixedly installed at one end of the sliding rod located in the slide groove, the sliding rod is connected to the installation groove wall through a second telescopic component, a slot for the block to enter is provided on the side wall of the insertion rod, the cross-section of the end of the insertion rod away from the mounting plate is an isosceles triangle, and the two inclined surfaces of the insertion rod are respectively arranged face to face with the inclined surfaces of the two blocks.

[0008] Preferably, the second telescopic component comprises a second telescopic spring sleeved on the slide rod, and two ends of the second telescopic spring are respectively fixedly connected to the surface of the clamping block and the groove wall of the installation groove.

[0009] Preferably, the upper and lower surfaces of the cushion body are both provided with water-swellable rubber, and the water-swellable rubber is compounded on the surface of the EPDM rubber.

[0010] Preferably, the first telescopic component comprises a first telescopic spring sleeved on the insertion rod, and two ends of the first telescopic spring are respectively fixedly connected to the surface of the mounting plate and the wall of the mounting groove.

[0011] Preferably, an anti-slip layer is bonded to the surface of the pull block, and the material of the anti-slip layer is rubber.

[0012] Preferably, a magnet is provided in the bayonet, and the clamping block is made of magnetic material.

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

[0014] 1. Through the cooperation between the plug rod, the card block, the bayonet and the pull block, multiple cushions can be spliced ​​together for use, and the disassembly and assembly steps are extremely simple, which increases the practicality of the cushion;

[0015] 2. The water-swellable rubber compounded on the surface can expand after the leakage path occurs, fill the leakage gap, enhance the waterproof performance between the surfaces, and thus repair the waterproofness of the sealing gasket;

[0016] 3. The process is simple and convenient. Due to the use of no foot sealing pad, the upper and lower contact surfaces are closed and continuous, which is suitable for the water-swelling rubber to be compounded on the EPDM rubber;

[0017] 4. The surface-compounded water-swelling rubber can reflect the path of water leakage to a certain extent. The double-sided compound water-swelling rubber method facilitates the test to pass specific physical properties (water swelling, lubrication of the water-exposed part, etc.) after the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a top-view three-dimensional structural schematic diagram of a double-sided composite water-swellable sealing pad without a foot portion proposed by the utility model;

[0019] Figure 2 for Figure 1 A magnified view of the structure at center;

[0020] Figure 3 This is a schematic diagram of the front three-dimensional structure of a double-sided composite water-swellable sealing pad without a foot portion proposed by the utility model;

[0021] Figure 4 This is a schematic diagram of the front section structure of a double-sided composite water-swellable sealing pad without a foot portion proposed by the utility model;

[0022] Figure 5 for Figure 4A magnified view of the structure at B in the middle;

[0023] Figure 6 It is a schematic diagram of the front structure of a sealing gasket in the prior art.

[0024] In the figure: 1 cushion body, 2 mounting groove, 3 plug rod, 4 mounting plate, 5 first telescopic spring, 6 slide groove, 7 slide rod, 8 clamping block, 9 pulling block, 10 bayonet, 11 second telescopic spring, 12 water-swellable rubber. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] The terms such as "upper", "lower", "left", "right", "middle" and "one" cited in the present utility model are only for the convenience of description and are not used to limit the scope of application of the present utility model. Changes or adjustments in their relative relationships shall be regarded as the scope of application of the present utility model without substantially changing the technical content.

[0027] Reference Figure 1-Figure 6 A double-sided composite water-expandable footless sealing pad comprises a pad body 1, an EPDM rubber is provided on the surface of the pad body 1, a mounting groove 2 is provided on the surface of the pad body 1, a through hole is provided on the wall of the mounting groove 2, a plug rod 3 is slidably inserted in the through hole, a mounting plate 4 is fixedly installed at one end of the plug rod 3, the plug rod 3 is connected to the wall of the mounting groove 2 through a first telescopic component, the first telescopic component comprises a first telescopic spring 5 sleeved on the plug rod 3, and the two ends of the first telescopic spring 5 are respectively fixedly connected to the surface of the mounting plate 4 and the wall of the mounting groove 2;

[0028] A slide groove 6 is symmetrically and horizontally provided in the pad body 1, and two through-holes are provided in the groove wall of the installation groove 2, which are respectively connected to the two slide grooves 6. A slide rod 7 is slidably inserted in the through-hole, and a trapezoidal block 8 is fixedly installed at one end of the slide rod 7 located in the installation groove 2, and a pull block 9 is fixedly installed at one end of the slide rod 7 located in the slide groove 6. The surface of the pull block 9 is bonded with an anti-slip layer, and the material of the anti-slip layer is rubber. The slide rod 7 is connected to the groove wall of the installation groove 2 through a second telescopic component, and the second telescopic component includes a second telescopic spring 11 sleeved on the slide rod 7, and the two ends of the second telescopic spring 11 are respectively fixedly connected to the surface of the block 8 and the groove wall of the installation groove 2. A bayonet 10 for the block 8 to enter is provided on the side wall of the insertion rod 3, and the cross-section of the end of the insertion rod 3 away from the mounting plate 4 is an isosceles triangle, and the two inclined surfaces of the insertion rod 3 are respectively arranged face to face with the inclined surfaces of the two blocks 8;

[0029] When the pad bodies 1 need to be spliced ​​for use, it is only necessary to push the two pad bodies 1 against each other, and then push the mounting plate 4 in one of the pad bodies 1 to move, at this time, the end of the insertion rod 3 will pass through the through hole and enter the mounting groove 2 opened on the surface of the other pad body 1, and the two inclined surfaces of the insertion rod 3 will slide in contact with the inclined surfaces of the two clamping blocks 8 respectively, and under the action of the inclined surface pressure, the two sliding rods 7 will move in the horizontal direction until the insertion rod 3 moves to the position where the bayonet 10 opened on the surface corresponds to the position of the two clamping blocks 8, at this time, the pressure applied by the insertion rod 3 to the two clamping blocks 8 disappears, and the two sliding rods 7 will quickly move and reset under the elastic potential energy of the second telescopic spring 11, and the two clamping blocks 8 will be inserted into the bayonet 10, thereby completing the splicing of the two pad bodies 1;

[0030] When disassembly is required, the two cushion bodies 1 can be quickly and conveniently released by pulling the two pull blocks 9 away from each other and controlling the two clamping blocks 8 to move out of the clamping openings 10 .

[0031] A magnet is provided in the bayonet 10 , and the card block 8 is made of magnetic material. When the card block 8 enters the bayonet 10 , it will be attracted by the magnetic force, thereby enhancing the stability of the card block 8 in the bayonet 10 and preventing the card block 8 from being moved out of the bayonet 10 due to the influence of vibration force.

[0032] The upper and lower surfaces of the pad body 1 are both provided with water-swellable rubber 12, and the water-swellable rubber 12 is compounded on the surface of the EPDM rubber;

[0033] The embedded composite gasket uses adhesive to stick the expanded rubber on the top of the porous gasket. Although this combined waterproofing can play a role in strengthening waterproofing, the adhesive connecting the two is mostly instant adhesive, which is not waterproof itself. After swelling in water, the swollen part is easy to separate from the main body of the EPDM rubber gasket, resulting in poor waterproof stability. The co-extruded composite gasket refers to the co-extrusion of EPDM rubber and water-swelling material before vulcanization, which can avoid the situation of swelling and separation from the main gasket in water. However, both of these gaskets take unilateral strengthening measures on the existing gasket outer contour form. The gasket waterproof leakage path is not only generated between the gaskets. According to different cross-sectional forms, leakage may also occur between the gasket and the groove. That is, both the embedded composite gasket and the co-extruded composite gasket have the problem of strengthening only one side.

[0034] The upper and lower surfaces of the pad body 1 are both compounded with water-swellable rubber 12, and the process is simple and convenient. Since a footless sealing pad is used, the upper and lower contact surfaces are closed and continuous, which is suitable for compounding the water-swellable rubber 12 on the EPDM rubber. After the pad body 1 is extruded by the tube segment, the rubber body will produce a rebound force, thereby compacting all contact surfaces to form a waterproof barrier belt. When high water pressure or aging of the rubber material occurs, the waterproof performance of the contact surface will decrease, and there is a probability of causing the formation of a leakage path. The compounded water-swellable rubber 12 will quickly absorb water and swell, producing a squeezing effect on the contact surface and filling the leakage gap, to a certain extent, the overall waterproof performance of the sealing pad is restored to its previous level, and the surface-compounded water-swellable rubber 12 can reflect the path of the leakage water to a certain extent. The double-sided compounding of the water-swellable rubber 12 is convenient for passing specific physical properties (water swelling, lubrication of the water-exposed part, etc.) after the test.

[0035] In the present invention, when the pad bodies 1 need to be spliced ​​for use, it is only necessary to push the two pad bodies 1 against each other, and then push the mounting plate 4 in one of the pad bodies 1 to move, at which time the end of the insertion rod 3 will pass through the through opening and enter the mounting groove 2 opened on the surface of the other pad body 1, and the two inclined surfaces of the insertion rod 3 will slide in contact with the inclined surfaces of the two card blocks 8 respectively. Under the action of the inclined surface pressure, the two sliding rods 7 will move in the horizontal direction until the insertion rod 3 moves to the position where the card opening 10 opened on the surface corresponds to the position of the two card blocks 8. When the pressing force exerted by the insertion rod 3 on the two card blocks 8 disappears, the two sliding rods 7 will quickly move and reset under the elastic potential energy of the second telescopic component, and the two card blocks 8 will be inserted into the bayonet 10, thereby completing the splicing of the two cushion bodies 1. When disassembly is required, the splicing of the two cushion bodies 1 can be quickly released by pulling the two pull blocks 9 away from each other and controlling the two card blocks 8 to move out of the bayonet 10. It is convenient and quick, and multiple cushion bodies 1 can be spliced ​​together for use, and the disassembly and assembly steps are extremely simple, which increases the practicality of the cushion body 1.

[0036] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense.

[0037] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A double-sided composite water-swellable sealing pad without a foot, comprising a pad body (1), characterized in that: The surface of the cushion body (1) is provided with EPDM rubber, the surface of the cushion body (1) is provided with a mounting groove (2), the groove wall of the mounting groove (2) is provided with a through hole, an insertion rod (3) is slidably inserted into the through hole, a mounting plate (4) is fixedly installed at one end of the insertion rod (3), and the insertion rod (3) is connected to the groove wall of the mounting groove (2) via a first telescopic component; The pad body (1) is symmetrically and horizontally provided with a slide groove (6), the groove wall of the installation groove (2) is provided with two through openings respectively connected with the two slide grooves (6), a slide rod (7) is slidably inserted in the through opening, one end of the slide rod (7) located in the installation groove (2) is fixedly provided with a trapezoidal block (8), one end of the slide rod (7) located in the slide groove (6) is fixedly provided with a pull block (9), the slide rod (7) is connected to the groove wall of the installation groove (2) through a second telescopic component, a bayonet (10) for the block (8) to enter is provided on the side wall of the insertion rod (3), the cross section of the end of the insertion rod (3) away from the installation plate (4) is an isosceles triangle, and the two inclined surfaces of the insertion rod (3) are respectively arranged face to face with the inclined surfaces of the two blocks (8).

2. The double-sided composite water-swellable footless sealing pad according to claim 1, characterized in that: The second telescopic component comprises a second telescopic spring (11) sleeved on the slide rod (7), and the two ends of the second telescopic spring (11) are respectively fixedly connected to the surface of the clamping block (8) and the groove wall of the installation groove (2).

3. The double-sided composite water-swellable footless sealing pad according to claim 1, characterized in that: The upper and lower surfaces of the cushion body (1) are both provided with water-swellable rubber (12), and the water-swellable rubber (12) is compounded on the surface of the EPDM rubber.

4. The double-sided composite water-swellable footless sealing pad according to claim 1, characterized in that: The first telescopic component comprises a first telescopic spring (5) sleeved on the insertion rod (3), and the two ends of the first telescopic spring (5) are respectively fixedly connected to the surface of the mounting plate (4) and the wall of the mounting groove (2).

5. The double-sided composite water-swellable footless sealing pad according to claim 1, characterized in that: An anti-slip layer is bonded to the surface of the pulling block (9), and the material of the anti-slip layer is rubber.

6. The double-sided composite water-swellable sealing gasket without a foot portion according to claim 1, characterized in that: A magnet is arranged in the bayonet (10), and the clamping block (8) is made of a magnetic material.

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