Waterproof performance testing device for double sealing gaskets of shield tunnel joint

Abstract

The utility model discloses a waterproof performance testing device for double sealing gaskets of a shield tunnel joint, which relates to the technical field of shield tunnel equipment and comprises a base, supports are fixed on the base, two butted testing pipelines are mounted on the supports, an air blowing part is arranged on the side surface of one support, a plugging part is arranged on the side surface of the other support, and the testing pipelines are connected with the air blowing part. The air blowing part and the blocking part slide along the base, a sliding groove is formed in the base for the air blowing part and the blocking part to slide, a testing frame is fixed to the pipe seam of the two testing pipelines, a testing part is fixed to the interior of the testing frame, and a pressure gauge is fixed to the side face of each testing pipeline; the testing device is convenient to adjust and suitable for testing pipelines or sealing gaskets of different sizes, testing points can be set according to actual needs, sealing testing results of different positions of the sealing gaskets can be obtained, and testing precision is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of shield tunnel equipment, and in particular relates to a test device for the waterproof performance of double-seal gaskets in shield tunnel joints. Background Technology

[0002] With the rapid development of urbanization in my country, the demand for tunnel construction, including subways and river tunnels, is enormous. Shield tunnels, as a major tunnel type, hold a crucial position. Waterproofing in underground engineering has always been a concern for engineers, and for shield tunnels, which are subject to long-term immersion and corrosion by groundwater, waterproofing performance is paramount. Waterproofing in shield tunnels not only affects the normal functioning of the tunnel but also its lifespan. Shield tunnel waterproofing includes segment self-waterproofing, joint waterproofing, and manhole waterproofing. Among these, segment lining blocks are prefabricated in factories, ensuring high quality and excellent impermeability, making it the most mature method. Joint waterproofing is the weakest point but also the most critical; therefore, the focus of shield tunnel waterproofing is on the waterproofing of the joints between segments and between rings. Due to differences in tunnel geological conditions and tunnel structures, waterproofing design conditions vary, often requiring extensive simulation tests to select appropriate joint waterproofing materials and cross-sectional types. Currently, most projects use EPDM porous rubber gaskets made of a single material (with good chemical stability, aging resistance, and excellent water resistance). Some projects also use composite gaskets composed of EPDM porous rubber and water-absorbing, expandable rubber. The sealing principle is that under certain pressure, the internal stress generated by the deformation of the internal holes of the sealing strip creates significant stress on the two contact surfaces, thus sealing against water.

[0003] Existing tests for the waterproof performance of double-sealed gaskets generally employ air pressure testing or water pressure testing. However, these two methods cannot provide a specific sealing performance result for a gasket within a certain angle; they only provide an overall performance result. Furthermore, the testing equipment used is not easily adjustable and cannot be properly fixed for testing pipes of different sizes. Utility Model Content

[0004] The purpose of this invention is to provide a testing device for the waterproof performance of double-layer sealing gaskets in shield tunnel joints. This testing device is easy to adjust and is suitable for testing pipes or sealing gaskets of different sizes. Test points can be set according to actual needs, and sealing test results at different positions of the sealing gasket can be obtained, thereby improving the testing accuracy.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A test device for the waterproof performance of double-sealed gaskets at shield tunnel joints includes a base, a support fixed on the base, and two test pipes installed on the support. One support has an air-blowing component on its side, and the other support has a sealing component on its side. Both the air-blowing component and the sealing component slide along the base. The base has a groove for the air-blowing component and the sealing component to slide. A test frame is fixed at the joint between the two test pipes, and a test piece is fixed inside the test frame. A pressure gauge is fixed on the side of the test pipe.

[0007] Furthermore, the test piece includes fixed ring blocks fixed inside the test frame, the fixed ring blocks are symmetrically arranged, a test film is bonded and fixed to the inner side of the two fixed ring blocks, and also includes a pressure sensor module that abuts against the surface of the test film. The pressure sensor module is fixed between the two fixed ring blocks, and several pressure sensor modules are arranged along the circumference of the fixed ring blocks. Each pressure sensor module is electrically connected to a communication module.

[0008] Furthermore, a telescopic rubber plate is bonded to the end of the test film away from the fixed ring block. The telescopic rubber plates are symmetrically arranged, and rubber rings are fixed to the ends of the two telescopic rubber plates away from the test film. The inner wall of the rubber rings is smooth.

[0009] Furthermore, the air-blowing component includes a first sliding block slidably connected inside the slide groove, a first fixing plate fixed to the top of the first sliding block, an air inlet pipe inserted into the middle of the first fixing plate, and a connecting pipe threaded to the side of the air inlet pipe.

[0010] Furthermore, the sealing component includes a second sliding block slidably connected inside the groove, a second fixing plate fixed to the top of the second sliding block, a top block fixed to the side of the second fixing plate, and the top block extending into one end of the test pipe.

[0011] Furthermore, a lead screw is rotatably connected inside the slide groove. One end of the lead screw extends along one end of the base, and a servo motor is connected to the extended end. The lead screw is configured in two sections, and both the lead screw and the first sliding block and the second sliding block are threadedly connected. The threaded connection direction between the lead screw and the first sliding block is opposite to the threaded connection direction between the lead screw and the second sliding block.

[0012] In summary, the beneficial technical effects of this utility model are as follows: the testing device is easy to adjust and convenient to place test pipes of different sizes, thus it is suitable for testing pipes or gaskets of different sizes. Moreover, test points can be set according to actual needs. Specifically, a corresponding number of pressure sensor modules can be set as needed to obtain sealing test results at different positions of the gasket, thereby improving the testing accuracy. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of a shield tunnel joint double-seal gasket waterproof performance testing device according to this embodiment;

[0015] Figure 2 This embodiment describes a test device for the waterproof performance of double-layer sealing gaskets at shield tunnel joints. Figure 1 Top view diagram;

[0016] Figure 3 This embodiment describes a test device for the waterproof performance of double-layer sealing gaskets at shield tunnel joints. Figure 2 A cross-sectional view;

[0017] Figure 4 This embodiment describes a test device for the waterproof performance of double-layer sealing gaskets at shield tunnel joints. Figure 3 Enlarged diagram of point A in the middle.

[0018] In the diagram: 1. Base; 2. Support; 3. Test pipe; 4. Test frame; 5. Pressure gauge; 6. Fixing ring; 7. Test diaphragm; 8. Pressure sensor module; 9. Telescopic rubber plate; 10. Rubber ring; 11. First sliding block; 12. First fixing plate; 13. Second sliding block; 14. Second fixing plate; 15. Lead screw; 16. Servo motor; 17. Air inlet pipe; 18. Connecting pipe. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 This utility model provides a technical solution: a test device for the waterproof performance of double-sealed gaskets in shield tunnel joints, including a base 1, a support 2 fixed on the base 1, and two test pipes 3 connected together on the support 2. One support 2 has an air-blowing component on its side, and the other support 2 has a sealing component on its side. Both the air-blowing component and the sealing component slide along the base 1. The base 1 has a groove for the air-blowing component and the sealing component to slide. A test frame 4 is fixed at the joint of the two test pipes 3. A test piece is fixed inside the test frame 4. A pressure gauge 5 is fixed on the side of the test pipe 3.

[0022] The air blower includes a first sliding block 11 that is slidably connected inside the slide groove. A first fixing plate 12 is fixed to the top of the first sliding block 11. An air inlet pipe 17 is inserted into the middle of the first fixing plate 12. A connecting pipe 18 is threaded to the side of the air inlet pipe 17.

[0023] The connecting pipe is connected to an external air supply device such as an air pump at the end away from the air inlet pipe. During the test, it is used to introduce gas into the two test pipes 3, and the pressure inside the test pipe 3 after the gas is introduced is measured by the pressure gauge 5 on the outside of the test pipe 3.

[0024] The sealing component includes a second sliding block 13 that is slidably connected inside the chute. A second fixing plate 14 is fixed to the top of the second sliding block 13, and a top block is fixed to the side of the second fixing plate 14. The top block extends into one end of the test pipe 3.

[0025] A lead screw 15 is rotatably connected inside the slide. One end of the lead screw 15 extends along one end of the base 1, and a servo motor 16 is connected to the extended end. The lead screw 15 is set in two sections. The lead screw 15 is threadedly connected to both the first sliding block 11 and the second sliding block 13. The threaded connection direction between the lead screw 15 and the first sliding block 11 is opposite to the threaded connection direction between the lead screw 15 and the second sliding block 13.

[0026] After the servo motor 16 is turned on, the servo motor 16 can drive the lead screw 15 to rotate. The lead screw 15 is threadedly connected to the first sliding block 11 and the second sliding block 13. As the lead screw 15 rotates, the first sliding block 11 and the second sliding block 13 slide along the inside of the slide groove. At the same time, when the lead screw 15 rotates in one direction, the first sliding block 11 and the second sliding block 13 move in opposite directions, which can simultaneously drive the first fixed plate 12 and the second fixed plate 14 to move toward the two test pipes 3.

[0027] Specifically, the test piece includes a fixing ring block 6 fixed inside the test frame 4. The fixing ring blocks 6 are symmetrically arranged. A test membrane 7 is bonded and fixed to the inner side of the two fixing ring blocks 6. It also includes a pressure sensor module 8 that abuts against the surface of the test membrane 7. The pressure sensor module 8 is fixed between the two fixing ring blocks 6. Several pressure sensor modules 8 are arranged along the circumference of the fixing ring blocks 6. Each pressure sensor module 8 is electrically connected to a communication module.

[0028] A telescopic rubber plate 9 is attached to the end of the test membrane 7 away from the fixed ring block 6. The telescopic rubber plates 9 are symmetrically arranged. Rubber rings 10 are fixed to the ends of the two telescopic rubber plates 9 away from the test membrane 7. The inner wall of the rubber rings 10 is smooth. The rubber rings 10 are fitted onto the test pipe 3 and the test membrane 7 is used for testing. The rubber rings 10 can shrink under the connection of the telescopic rubber plates 9, changing their inner diameter. Therefore, they can be used to fit onto the outside of test pipes 3 of different sizes.

[0029] The working principle of this utility model is as follows: Two test pipes 3 are connected after installing double sealing gaskets in the middle, and placed on top of two supports 2. The supports 2 have grooves inside for the test pipes 3 to be placed. After the test pipes 3 are placed, the servo motor 16 is turned on to drive the first fixing plate 12 and the second fixing plate 14 to move, so that the top block on the second fixing plate 14 is inserted into the test pipe 3 and the end of the test pipe 3 is sealed by the second fixing plate 14. At the same time, the first fixing plate 12 is sealed at the other end of the test pipe 3, and an external air blowing device is connected to ventilate the inside through an air pump. The internal air pressure is observed by a pressure gauge. After the internal air pressure stabilizes, the inflation is stopped, and the pressure change inside the test frame 4 is observed over the next two hours. Specifically, if the sealing at the connection of the test pipes 3 is insufficient, the pressure is released to the outside, so that the test membrane 7 is filled, which in turn causes the electrical signal inside the pressure sensor module 8 outside the test membrane 7 to change. The pressure change can be observed remotely through the communication module, and the test result is obtained based on the amount of pressure change.

[0030] The aforementioned standards for pressure variation and sealing performance can be defined before testing, or by using existing conventional judgment methods in the field.

[0031] Among them, the test film 7 is made of a polyurethane film with good elasticity.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for testing the waterproof performance of a double-channel sealing pad based on a shield tunnel joint, characterized in that, Includes a base (1), a support (2) fixed on the base (1), and two test pipes (3) connected together on the support (2). One support (2) has an air blower on its side and the other support (2) has a sealing component on its side. The air blower and the sealing component slide along the base (1). The base (1) has a groove for the air blower and the sealing component to slide. A test frame (4) is fixed at the pipe joint of the two test pipes (3). A test piece is fixed inside the test frame (4). A pressure gauge (5) is fixed on the side of the test pipe (3).

2. The shield tunnel joint double-line sealing pad waterproof performance testing device according to claim 1, characterized in that, The test piece includes a fixing ring block (6) fixed inside the test frame (4), the fixing ring blocks (6) are symmetrically arranged, and a test film (7) is bonded and fixed to the inner side of the two fixing ring blocks (6). It also includes a pressure sensor module (8) that abuts against the surface of the test film (7). The pressure sensor module (8) is fixed between the two fixing ring blocks (6). Several pressure sensor modules (8) are arranged along the circumference of the fixing ring blocks (6), and each pressure sensor module (8) is electrically connected to a communication module.

3. The shield tunnel joint double sealing pad waterproof performance testing device according to claim 2, characterized in that, The test film (7) is attached to a telescopic rubber plate (9) at the end away from the fixed ring block (6). The telescopic rubber plates (9) are symmetrically arranged. The ends of the two telescopic rubber plates (9) away from the test film (7) are fixed with rubber rings (10). The inner wall of the rubber rings (10) is smooth.

4. The shield tunnel joint double sealing pad waterproof performance testing device according to claim 1, characterized in that, The air blower includes a first sliding block (11) slidably connected inside the slide groove. A first fixing plate (12) is fixed to the top of the first sliding block (11). An air inlet pipe is inserted into the middle of the first fixing plate (12), and a connecting pipe is threaded to the side of the air inlet pipe.

5. The shield tunnel joint double sealing pad waterproof performance testing device according to claim 4, characterized in that, The sealing component includes a second sliding block (13) slidably connected inside the groove. A second fixing plate (14) is fixed to the top of the second sliding block (13), and a top block is fixed to the side of the second fixing plate (14). The top block extends into one end of the test pipe (3).

6. The shield tunnel joint double sealing pad waterproof performance testing device according to claim 4, characterized in that, A lead screw (15) is rotatably connected inside the slide groove. One end of the lead screw (15) extends along one end of the base (1), and a servo motor (16) is connected to the extended end. The lead screw (15) is set in two sections. The lead screw (15) is threadedly connected to the first sliding block (11) and the second sliding block (13). The threaded connection direction between the lead screw (15) and the first sliding block (11) is opposite to the threaded connection direction between the lead screw (15) and the second sliding block (13).

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