Test device for simulating shield tail sealing failure under high water pressure condition

Abstract

The invention discloses a test device for simulating shield tail sealing failure under a high water pressure condition, and relates to the technical field of shield tail sealing performance tests.The test device comprises a shield tail model, and an upper cover is arranged at an upper opening of the shield tail model in a sealed mode; the shield tail sealing brush model is provided with a top plate and a plurality of brush bodies, and the shield tail model is divided into a water inlet cavity, a liquid drainage cavity and a plurality of oil sealing cavities located between the water inlet cavity and the liquid drainage cavity through the brush bodies. A shield tail structure is simulated through the shield tail model and the shield tail sealing brush model, high-pressure water is injected through the water inlet, so that the working condition of the shield tail structure in a high-pressure water environment is simulated, and the sealing performance of the shield tail structure in a high-water-pressure environment is tested. The device is simple in structure and convenient to operate, the whole testing process can be completed by one person, and the device has good application prospects and wide application range.

Description

Technical Field

[0001] The invention relates to the technical field of shield tail sealing performance testing, in particular to a testing device for simulating shield tail sealing failure under high water pressure conditions. Background Art

[0002] Underwater tunnels offer significant advantages as a cross-water transport structure. During shield tunneling, the shield tail seal is a crucial safety factor. Prolonged construction can cause the shield tail seal to fail. This is because high water pressure in the construction environment can cause water to penetrate the shield tail seal brush and grease, leading to seal failure.

[0003] Therefore, before shield tunneling, the sealing performance of the shield tail needs to be tested in a high water pressure environment. How to provide a shield tail sealing performance testing device that simulates a high water pressure environment is a problem that technical personnel in this field urgently need to solve. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device for simulating shield tail seal failure under high water pressure conditions, so as to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides a test device for simulating shield tail seal failure under high water pressure conditions, comprising:

[0006] The shield tail model is hollow inside and has an upper opening at the top;

[0007] An upper cover, sealed and arranged on the upper opening of the shield tail model;

[0008] The shield tail sealing brush model has a top plate and multiple brush bodies. The top plate is arranged on the lower surface of the upper cover. One end of the brush body is connected to the top plate, and the other end extends downward and connects to the bottom surface of the shield tail model. The two side surfaces of the multiple brush bodies are connected to the inner side surface of the shield tail model, dividing the shield tail model into a water inlet chamber, a liquid discharge chamber, and multiple oil sealing chambers located between the water inlet chamber and the liquid discharge chamber.

[0009] a water inlet, one end of which is connected to the water inlet chamber and the other end of which is connected to the water inlet pump;

[0010] a main drain port, one end of which is in communication with the drain chamber and the other end of which is in communication with the outside;

[0011] The grease inlet is connected to the oil sealing chamber at one end and to the oil feed pump at the other end; the water inlet, main drain port and grease inlet are all provided with electric control valves.

[0012] Furthermore, it also includes: an auxiliary liquid drain port, one end of which is connected to the oil sealing chamber and the other end is connected to the outside, and the auxiliary liquid drain port is provided with an electric control valve.

[0013] Furthermore, the water inlet chamber is provided with a first hydraulic sensor, and the oil sealing chamber is provided with a second hydraulic sensor. When the water pressure penetrates the shield tail sealing brush model from the water inlet chamber, the pressure values detected by the first hydraulic sensor and the second hydraulic sensor are the same.

[0014] Furthermore, the second hydraulic pressure sensor is arranged on the lower surface of the upper cover.

[0015] Furthermore, there are two oil sealing chambers, and the water inlet chamber and the drainage chamber are provided with grease outlets, one end of the grease outlet is connected to the water inlet chamber or the drainage chamber, and the other end is connected to the outside.

[0016] Furthermore, silicone pads are provided on both side surfaces of the brush body.

[0017] Furthermore, it also includes:

[0018] a frame, on which the shield tail model is arranged;

[0019] The oil cylinder piston is located above the upper cover and is arranged on the frame through a mounting frame. The output end of the oil cylinder piston extends downward and is connected to the upper cover.

[0020] Furthermore, a sealing ring is provided on the outer edge of the upper cover, and the outer side of the sealing ring is connected to the upper opening of the shield tail model. The cylinder piston can drive the upper cover and the sealing ring to move in the up and down directions to adjust the gap between the upper cover and the bottom surface of the shield tail model; when the gap between the upper cover and the bottom surface of the shield tail model changes, the brush body can perform elastic deformation accordingly.

[0021] Furthermore, the rack is provided with a horizontal slide rail, and the mounting frame is slidably connected to the horizontal slide rail.

[0022] Furthermore, it also includes:

[0023] A clamp is provided on the shield tail model through bolts and is connected to the upper surface of the upper cover.

[0024] The present invention discloses the following technical effects:

[0025] 1. The shield tail structure is simulated using a shield tail model and a shield tail sealing brush model. High-pressure water is injected through the water inlet to simulate the shield tail structure's operating conditions in a high-pressure water environment. The sealing performance of the shield tail structure in this high-pressure water environment is tested. The simple structure and easy operation allow one person to complete the entire testing process, demonstrating promising application prospects and a wide range of applicability.

[0026] 2. The first and second hydraulic sensors are used to determine whether the water pressure has penetrated the shield tail sealing brush model. This is a simple and reliable method. The second hydraulic sensor is located on the lower surface of the upper cover and can also be used to determine whether the sealing oil chamber is filled with sealing grease.

[0027] 3. The upper cover is connected to the cylinder piston and can move up and down to adjust the gap between the upper cover and the bottom of the shield tail model, accurately simulating the working conditions of the shield structure and improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the coordination between the shield tail model and the upper cover;

[0031] Figure 3 This is a schematic diagram of the bottom surface coordination between the shield tail sealing brush model and the shield tail model;

[0032] Figure 4 This is a schematic diagram of the shield tail sealing brush model;

[0033] Among them, 1. Shield tail model; 101. Water inlet chamber; 102. Drain chamber; 103. Oil sealing chamber; 2. Upper cover; 3. Shield tail sealing brush model; 301. Top plate; 302. Brush body; 4. Water inlet; 5. Main drain port; 6. Grease inlet; 7. Secondary drain port; 8. First hydraulic sensor; 9. Frame; 10. Cylinder piston; 11. Mounting frame; 12. Clamp; 13. Pressure relief valve; 14. Operation panel. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] An embodiment of the present invention provides a test device for simulating shield tail seal failure under high water pressure conditions, comprising:

[0037] The shield tail model 1 is hollow inside and has an upper opening on the top. The shield tail model 1 is made of transparent material or has acrylic transparent observation windows on both sides to facilitate real-time monitoring of the internal dynamics of the shield tail model 1;

[0038] An upper cover 2 is sealed on the upper opening of the shield tail model 1;

[0039] The shield tail sealing brush model 3 comprises a top plate 301 and a plurality of brush bodies 302. The top plate 301 is disposed on the lower surface of the upper cover 2. One end of the brush body 302 is connected to the top plate 301 by a bolt, and the other end extends downward and connects to the bottom surface of the shield tail model 1. The side surfaces of the plurality of brush bodies 302 connect to the inner side surface of the shield tail model 1, dividing the shield tail model 1 into a water inlet chamber 101, a liquid discharge chamber 102, and a plurality of oil sealing chambers 103 located between the water inlet chamber 101 and the liquid discharge chamber 102.

[0040] The water inlet 4 is connected to the water inlet chamber 101 at one end and to the water inlet pump at the other end;

[0041] The main drain port 5 has one end connected to the drain chamber 102 and the other end connected to the outside;

[0042] The grease inlet 6 is connected to the oil sealing chamber 103 at one end and to the oil feed pump at the other end; the water inlet 4, the main drain port 5 and the grease inlet 6 are all provided with electronically controlled valves.

[0043] In this embodiment, it also includes: an auxiliary drain port 7, one end of which is connected to the oil sealing chamber 103, and the other end is connected to the outside. The auxiliary drain port 7 is provided with an electric control valve. The main drain port 5 and the auxiliary drain port 7 can be used for discharging oil and water.

[0044] In this embodiment, the water inlet chamber 101 is provided with a first hydraulic sensor 8, and the oil sealing chamber 103 is provided with a second hydraulic sensor. When the water pressure penetrates the shield tail sealing brush model 3 from the water inlet chamber 101, the pressure values detected by the first hydraulic sensor 8 and the second hydraulic sensor are the same.

[0045] In this embodiment, a second hydraulic pressure sensor is disposed on the lower surface of the upper cover 2. The second hydraulic pressure sensor can be used to determine whether the sealing oil chamber 103 is fully filled with sealing grease. When the sealing grease is fully filled, its liquid level contacts the second hydraulic pressure sensor, and the hydraulic pressure detected by the second hydraulic pressure sensor gradually increases, at which point it can be determined that the sealing oil chamber 103 is fully filled with sealing grease.

[0046] In this embodiment, two oil sealing chambers 103 are provided. The water inlet chamber 101 and the liquid discharge chamber 102 are provided with grease outlets. One end of the grease outlet is connected to the water inlet chamber 101 or the liquid discharge chamber 102, and the other end is connected to the outside. The grease outlets are used to assist in determining whether the oil sealing chamber 103 is fully filled with sealing grease. When the oil sealing chamber 103 is fully filled with sealing grease, a small amount of sealing grease will seep into the water inlet chamber 101 and the liquid discharge chamber 102. If sealing grease is discharged from the grease outlets at this time, the oil sealing chamber 103 can be determined to be fully filled with sealing grease.

[0047] In this embodiment, silicone pads are provided on both sides of the brush body 302 to prevent sealing grease from overflowing from both sides of the brush body 302 .

[0048] In this embodiment, it also includes:

[0049] Frame 9, shield tail model 1 is arranged on the frame 9;

[0050] The oil cylinder piston 10 is located above the upper cover 2 and is set on the frame 9 through the mounting bracket 11. The output end of the oil cylinder piston 10 extends downward and is connected to the upper cover 2.

[0051] In this embodiment, a sealing ring is provided on the outer edge of the upper cover 2, and the outer side of the sealing ring is connected to the upper opening of the shield tail model 1. The sealing ring is used to seal the gap between the upper cover 2 and the upper opening of the shield tail model 1 and can withstand hydraulic pressure within 2 MPa. The cylinder piston 10 can drive the upper cover 2 and the sealing ring to move in the up and down directions to adjust the gap between the upper cover 2 and the bottom surface of the shield tail model 1; when the gap between the upper cover 2 and the bottom surface of the shield tail model 1 changes, the brush body 302 can perform elastic deformation accordingly.

[0052] In this embodiment, a horizontal slide rail is provided on the frame 9, and the mounting frame 11 is slidably connected to the horizontal slide rail. A linear drive mechanism such as a drive motor can be provided on the frame 9 to drive the mounting frame 11, the cylinder piston 10 and the upper cover 2 on the mounting frame 11, and move the entire frame in a horizontal direction.

[0053] In this embodiment, it also includes:

[0054] The clamp 12 is provided on the shield tail model 1 by bolts and connected to the upper surface of the upper cover 2. The clamp 12 is used to cooperate with the cylinder piston to act on the upper cover 2 to prevent the upper cover 2 from being deformed due to excessive water pressure.

[0055] In this embodiment, it also includes:

[0056] The computer and operation panel 14, mounted on the frame 9, are used to control the opening and closing of the electrically controlled valves corresponding to the water inlet 4, the main drain port 5, the grease inlet 6, and the auxiliary drain port 7. They are also used to control the start and stop of the cylinder piston and the vertical movement distance, and can also control the start and stop of the drive motor.

[0057] In this embodiment, the upper cover 2 is provided with mounting holes through the upper and lower surfaces, and a pressure relief valve 13 is provided in the mounting hole. After the test is completed, the pressure of the equipment is relieved through the pressure relief valve 13.

[0058] The specific working process is as follows:

[0059] 1. Single chamber breakdown test

[0060] Before the test begins, the position of the upper cover 2 is adjusted by the oil cylinder piston 10 to change the gap between the upper cover 2 and the bottom surface of the shield tail model 1. After the gap is adjusted, the clamp 12 is installed.

[0061] The oil sealing chamber 103 on the left is the left oil sealing chamber 103, and the oil sealing chamber 103 on the right is the right oil sealing chamber 103. Open the grease inlet 6 in the right oil sealing chamber 103 and the grease outlet in the water inlet chamber 101, and inject sealing grease through the oil inlet pump. When the second hydraulic sensor detects the hydraulic pressure of the sealing grease or sealing grease flows out of the grease outlet, the oil inlet pump stops, and it is determined that the right oil sealing chamber 103 is full of sealing grease, and the grease inlet 6 and the grease outlet are closed.

[0062] Open the water inlet 4 and use the water pump to deliver high-pressure water to the water inlet chamber 101. The first hydraulic sensor 8 detects the water pressure and adjusts the water pressure with the water inlet pump until the high-pressure water penetrates the brush body 302. At this point, the water inlet chamber 101 and the right oil sealing chamber 103 are connected, and the pressure values detected by the first hydraulic sensor 8 and the second hydraulic sensor are the same. The water breakdown pressure is recorded. Open the auxiliary drain port 7 to drain the sealing grease and water together.

[0063] 2. Double chamber breakdown test

[0064] The operating process is identical to the single-chamber principle described above, except that both the left and right oil sealing chambers 103 are simultaneously filled with sealing grease. When the pressure values detected by the first hydraulic pressure sensor 8 and all the second hydraulic pressure sensors are identical, the brush bodies 302 of both oil sealing chambers 103 are deemed to have been penetrated, and the penetration pressure is recorded. The primary and secondary drain ports 5 and 7 are then opened to drain the sealing grease and water.

[0065] After the test is completed, the pressure is released through the pressure relief valve 13, and the upper cover 2 is driven upward by the cylinder piston and moved horizontally to a position outside the frame 9, and the equipment can be disassembled and stored.

[0066] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, 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 cannot be understood as a limitation on the present invention.

[0067] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A test device for simulating shield tail seal failure under high water pressure conditions, characterized in that: include: The shield tail model (1) is hollow inside and has an upper opening at the top; An upper cover (2) is sealed and arranged on the upper opening of the shield tail model (1); The shield tail sealing brush model (3) comprises a top plate (301) and a plurality of brush bodies (302), wherein the top plate (301) is arranged on the lower surface of the upper cover (2), one end of the brush body (302) is connected to the top plate (301), and the other end extends downward and is connected to the bottom surface of the shield tail model (1), and the two side surfaces of the plurality of brush bodies (302) are connected to the inner side surface of the shield tail model (1), thereby separating the shield tail model (1) into a water inlet chamber (101), a liquid discharge chamber (102), and a plurality of oil sealing chambers (103) located between the water inlet chamber (101) and the liquid discharge chamber (102); a water inlet (4), one end of which is in communication with the water inlet chamber (101) and the other end of which is in communication with the water inlet pump; a main liquid discharge port (5), one end of which is in communication with the liquid discharge chamber (102) and the other end of which is in communication with the outside; The grease inlet (6) is connected to the oil sealing chamber (103) at one end and to the oil feed pump at the other end; the water inlet (4), the main drain port (5) and the grease inlet (6) are all provided with electric control valves.

2. A test device for simulating shield tail seal failure under high water pressure conditions according to claim 1, characterized in that: Also includes: One end of the auxiliary liquid discharge port (7) is in communication with the oil sealing chamber (103), and the other end is in communication with the outside. The auxiliary liquid discharge port (7) is provided with an electric control valve.

3. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 1, characterized in that: The water inlet chamber (101) is provided with a first hydraulic sensor (8), and the oil sealing chamber (103) is provided with a second hydraulic sensor. When water pressure penetrates the shield tail sealing brush model (3) from the water inlet chamber (101), the pressure values detected by the first hydraulic sensor (8) and the second hydraulic sensor are the same.

4. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 3, characterized in that: The second hydraulic pressure sensor is arranged on the lower surface of the upper cover (2).

5. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 4, characterized in that: There are two oil sealing chambers (103), and the water inlet chamber (101) and the drainage chamber (102) are provided with grease outlets. One end of the grease outlet is connected to the water inlet chamber (101) or the drainage chamber (102), and the other end is connected to the outside.

6. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 1, characterized in that: Silicone pads are provided on both sides of the brush body (302).

7. A test device for simulating shield tail seal failure under high water pressure conditions according to any one of claims 1 to 6, characterized in that: Also includes: A frame (9), wherein the shield tail model (1) is arranged on the frame (9); The oil cylinder piston (10) is located above the upper cover (2) and is arranged on the frame (9) through a mounting frame (11). The output end of the oil cylinder piston (10) extends downward and is connected to the upper cover (2).

8. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 7, characterized in that: The outer edge of the upper cover (2) is provided with a sealing ring, the outer side of the sealing ring being connected to the upper opening of the shield tail model (1), and the oil cylinder piston (10) can drive the upper cover (2) and the sealing ring to move in the up and down directions to adjust the gap between the upper cover (2) and the bottom surface of the shield tail model (1); when the gap between the upper cover (2) and the bottom surface of the shield tail model (1) changes, the brush body (302) can correspondingly undergo elastic deformation.

9. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 8, characterized in that: The frame (9) is provided with a horizontal slide rail, and the mounting frame (11) is slidably connected to the horizontal slide rail.

10. The test device for simulating shield tail seal failure under high water pressure conditions according to claim 7, characterized in that: Also includes: A clamp (12), wherein the clamp (12) is arranged on the shield tail model (1) through bolts and is connected to the upper surface of the upper cover (2).

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