Slurry shield machine starting hole sealing device with leak detection and leak detection method

Abstract

The present invention discloses a sealing device and a leak detection method for the starting hole of a mud shield machine with leak detection, comprising a short sleeve arranged on the end of the starting well, a first sealing ring, a second sealing ring, and a third sealing ring are arranged in sequence from the inside to the outside between the short sleeve and the shield body of the shield machine, the first sealing ring and the second sealing ring are arranged on the inner wall of the short sleeve, the third sealing ring is arranged on the outer end surface of the short sleeve, a door flap is arranged on the outer side of the third sealing ring, a sealing chamber is formed between the first sealing ring and the second sealing ring, a grease injection hole is arranged on the outer wall of the short sleeve of the sealing chamber, sealing grease is injected into the sealing chamber through the grease injection hole, the grease injection hole is connected to a pressure gas source through a switch valve, and the pressure gas source is used to detect air leakage in the sealing chamber before injecting the sealing grease. The present invention can realize the addition of a leak detection process before injecting grease into the sealing chamber through the self-contained leak detection device to avoid grease waste.

Description

Technical Field

[0001] The invention relates to the technical field of shield machine construction, and in particular to a slurry shield machine starting hole sealing device with leak detection function and a leak detection method. Background Art

[0002] During the construction of slurry shield, the loose water-rich sand and gravel stratum carries a water pressure of 0.25MPa. At the initial construction, the underground water head at the top of the shield is 1~6m, and there is a serious risk of water and sand gushing. In order to prevent water and sand from leaking from the side wall of the shield machine, the starting section of the slurry shield needs to be sealed. How to do a good job of sealing while ensuring that the shield machine body rotates normally without being damaged? Summary of the invention

[0003] The purpose of the present invention is to propose a sealing device and a leak detection method for the starting tunnel of a slurry shield machine, wherein a sealing chamber is formed on the outside of a shield body of the shield machine through a short sleeve and a sealing ring, and pressurized sealing grease is injected into the sealing chamber, so that the sealing effect can be guaranteed when the shield body of the shield machine rotates normally; before the grease is injected into the sealing chamber, a leak detection process is added, and a mixed high-pressure gas containing an odor is filled into the sealing chamber, and the hidden dangers of the sealing ring are qualitatively and specifically checked to ensure construction safety.

[0004] In order to achieve the above-mentioned purpose, the technical scheme of the present invention is: a slurry shield machine starting tunnel sealing device with leak detection, comprising a short sleeve arranged on the end of the starting shaft, the short sleeve is sleeved on the outer side of the shield body of the shield machine, wherein a first sealing ring, a second sealing ring, and a third sealing ring are arranged between the short sleeve and the shield body of the shield machine from the inside to the outside, the first sealing ring and the second sealing ring are arranged on the inner wall of the short sleeve, the third sealing ring is arranged on the outer end surface of the short sleeve, a tunnel door flap is arranged on the outer side of the third sealing ring, a sealing chamber is formed between the first sealing ring and the second sealing ring, a grease injection hole is provided on the outer wall of the short sleeve of the sealing chamber, sealing grease is injected into the sealing chamber through the grease injection hole, the grease injection hole is connected to a pressure air source through a switch valve, and the pressure air source is used to perform leakage detection on the sealing chamber before injecting the sealing grease.

[0005] A further solution is that the first sealing ring and the second sealing ring are wire brush sealing rings, and sealing grease is manually filled in the wire brush sealing rings.

[0006] A further solution is that one third of the length of the wire brush is bent inwardly by the shield body of the shield machine as the shield body of the shield machine is pushed in and is closely attached to the outer side of the shield body of the shield machine.

[0007] A further solution is: the third sealing ring is a rubber sealing ring, one third of the height of the rubber sealing ring is bent inwardly by the shield body of the shield machine as the shield body of the shield machine is pushed in and is tightly attached to the outer side of the shield body of the shield machine.

[0008] The scheme is further as follows: the pressure gas source includes a gas mixing tank, which is respectively connected to an air compressor and an odorous gas tank. The odorous gas in the odorous gas tank is sent into the gas mixing tank, and then mixed with air in the gas mixing tank through the air compressor and then pressed into the sealed chamber.

[0009] The solution further comprises: a sealing film (15) is provided on the outside of the short sleeve, and a closed space enclosed by the sealing film and the short sleeve is connected to an odor detector (16) via a flexible leak detection pipe (17).

[0010] A sealing leak detection method based on the slurry shield machine starting hole sealing device with leak detection, the sealing chamber is sealed and leak detected before the sealing grease is poured into the sealing chamber, wherein the pressure gas source includes a gas mixing tank, the gas mixing tank is respectively connected to an air compressor and an odor gas tank, a sealing film is provided on the outside of the short sleeve, and the closed space surrounded by the sealing film and the short sleeve is connected to an odor detector through a flexible leak detection pipeline, and the gas leakage detection method is:

[0011] The first step is to turn on the switch of the odor gas tank, fill the odor gas into the mixing tank, and turn off the switch after the pressure in the mixing tank reaches a set pressure value of the odor gas;

[0012] The second step is to start the air compressor and open the switch valve to charge the gas in the gas mixing tank into the sealed chamber to maintain the detection pressure setting value;

[0013] The third step is qualitative leak detection: turn on the odor detector. If there is no odor, or the odor concentration is less than the set value within a set time, it is considered that there is no leakage and the leak detection is completed. If there is odor and the odor concentration is equal to or greater than the set value within a set time, it is considered that there is a leak and proceed to the next step for positioning leak detection;

[0014] The fourth step is to locate and detect leaks: remove the sealing film, dismantle the tunnel door flap, turn the third sealing ring outside, and use the trumpet-shaped gas gathering port at the end of the flexible leak detection pipe to close the contact gap between the second sealing ring and the shield body of the shield machine, and detect the leak point from bottom to top;

[0015] Step 5: Repair the sealing ring and return to step 1 for re-inspection.

[0016] A further solution is that the first sealing ring and the second sealing ring are wire brush sealing rings, and sealing grease is manually filled into the wire brush sealing rings.

[0017] A further solution is: the sealing ring is repaired by withdrawing the shield body of the shield machine, re-filling the sealing ring with sealing grease by wire brushing manually, and then pushing the shield body of the shield machine in.

[0018] The beneficial effects of the present invention are as follows: a sealing chamber is formed on the outside of the shield body of the shield machine through a short sleeve and a sealing ring, and pressurized sealing grease is injected into the sealing chamber, so that the sealing effect can be guaranteed when the shield body of the shield machine rotates normally; through the built-in leak detection equipment, a leak detection process can be added before the grease is injected into the sealing chamber, and a mixed high-pressure gas containing odor is filled into the sealing chamber, and the hidden dangers of the sealing ring are qualitatively and specifically checked, so as to ensure construction safety, facilitate re-inspection of the leak detection method, and avoid waste of grease.

[0019] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0022] In the description of this embodiment, it should be noted that the terms "connect" and "placed" should be understood in a broad sense. For example, "connect" can be a wire connection or a mechanical connection; "placed" can be a fixed connection placement or an integral placement. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] A slurry shield machine starting hole sealing device with leak detection, such as Figure 1As shown, it includes a short sleeve 2 arranged on the starting shaft end 1, the short sleeve 2 is a metal sleeve, and the short sleeve is sleeved on the outer side of the shield body 3 of the shield machine, wherein the first sealing ring 4, the second sealing ring 5, and the third sealing ring 6 are arranged in sequence from the inside to the outside between the short sleeve and the shield body 3 of the shield machine, the first sealing ring 4 and the second sealing ring 5 are rigid sealing rings, and the third sealing ring 6 is a flexible sealing ring, wherein: the first sealing ring 4 and the second sealing ring 5 are fixedly arranged on the inner wall 201 of the short sleeve 2, and the third sealing ring 6 is arranged on the outer end face 202 of the short sleeve 2, The outer side of the third sealing ring is pressed by the third sealing ring and is provided with a tunnel door flap 7 through a hinge. A sealing chamber 8 is formed between the first sealing ring 4 and the second sealing ring 5. The functions of the first sealing ring 4, the second sealing ring 5 and the sealing chamber 8 are to prevent the high-pressure mud in the tunnel from leaking from the side of the shield body of the shield machine. A grease injection hole 9 is provided on the outer wall of the short sleeve of the sealing chamber. Sealing grease is injected into the sealing chamber through the grease injection hole 9. The grease injection hole 9 is connected to a pressure air source through a switch valve 10. The pressure air source is used to detect air leakage in the sealing chamber before injecting the sealing grease.

[0025] Among them: the first sealing ring 4 and the second sealing ring 5 are wire brush sealing rings, and the wire brush sealing rings are filled with sealing grease by hand. In addition, one third of the length of the wire brush is pressed inward by the shield body 3 of the shield machine as the shield body 3 of the shield machine is pushed in, and is tightly attached to the outer side of the shield body 3 of the shield machine. Among them, the third sealing ring 6 is a rubber sealing ring, and one third of the height of the rubber sealing ring is also pressed inward by the shield body 3 of the shield machine as the shield body 3 of the shield machine is pushed in, and is tightly attached to the outer side of the shield body 3 of the shield machine.

[0026] Since the slurry shield machine is a large-scale equipment, the diameter of its shield body is several meters, so it is difficult to detect air leakage by conventional methods. The present embodiment adopts odor detection, that is, introducing odorous gas, for example, gas with bad smell, sour smell, or other harmless odorous gas, or helium. Therefore, the pressure gas source includes a gas mixing tank 11, and the gas mixing tank 11 is respectively connected to an air compressor 12 and an odorous gas tank 13. After the odorous gas of the odorous gas tank is sent to the gas mixing tank 11, the air pressed into the gas mixing tank 11 by the air compressor is mixed with the odorous gas and then pressed into the sealing chamber, and then the odor sensor is used to detect whether the sealing ring has air leakage, for example: a sealing film 15 is provided on the outside of the short sleeve, and the closed space surrounded by the sealing film and the short sleeve is connected to the odor detector 16 through a flexible leak detection pipeline 17.

[0027] Embodiment 2:

[0028] A sealing leak detection method for a slurry shield machine starting hole sealing device with leak detection based on Example 1, the contents of Example 1 are applicable to this embodiment, and the method of this embodiment performs a sealing leak detection on the sealing chamber before injecting sealing grease into the sealing chamber, wherein, Figure 1As shown, the pressure gas source includes a gas mixing tank 11, and the gas mixing tank 11 is respectively connected to an air compressor 12 and an odor gas tank 13. In order to improve the detection efficiency, a sealing film 15 is provided on the outside of the short sleeve. The closed space surrounded by the sealing film 15 and the short sleeve 2 is connected to the odor detector 16 through a flexible leak detection pipeline 17. The gas leakage detection method is:

[0029] The first step is to open the switch valve 14 of the odor gas tank 13 with pressure, fill the odor gas into the mixing tank 11, and after the pressure in the mixing tank reaches a set odor gas pressure value, for example: 1MPa pressure, close the switch 14;

[0030] The second step is to start the air compressor 12, open the switch valve 10 to charge the gas in the gas mixing tank into the sealed chamber 8, and maintain the detection pressure setting value, for example: 5MPa pressure;

[0031] The third step is qualitative leak detection: turn on the odor detector 16. If no odor is detected, that is, there is no odor, or the odor concentration is less than the set value within a set time (for example, 1 minute), it is considered that there is no leakage and the leak detection is completed. If there is odor and the odor concentration is equal to or greater than the set value within a set time (for example, 1 minute), it is considered that there is a leak, and the next step is to perform positioning leak detection;

[0032] Step 4: Positioning and leak detection: remove the sealing film 15, dismantle the tunnel door flap 7, turn the third sealing ring 6 outside, and use the trumpet-shaped gas gathering port 1701 at the end of the flexible leak detection pipe 17 to close the contact gap between the second sealing ring 5 and the shield body 3 of the shield machine to detect the leak point from bottom to top;

[0033] Step 5: Repair the sealing ring and return to step 1 for re-inspection.

[0034] The first sealing ring 4 and the second sealing ring 5 are wire brush sealing rings, and the wire brush sealing rings are filled with sealing grease manually. Furthermore, the sealing ring is repaired by withdrawing the shield body 3 of the shield machine, refilling the wire brush sealing ring with sealing grease manually, and then pushing the shield body 3 of the shield machine in.

[0035] The above-mentioned embodiment forms a sealing chamber on the outside of the shield body of the shield machine through a short sleeve and a sealing ring, and pressurized sealing grease is injected into the sealing chamber, so that the sealing effect can be guaranteed when the shield body of the shield machine rotates normally; through the built-in leak detection equipment, it is possible to add a leak detection process before the sealing chamber is injected with grease, and a mixed high-pressure gas containing odor is filled into the sealing chamber, and the hidden dangers of the sealing ring are qualitatively and specifically checked, so as to ensure construction safety, facilitate re-inspection of the leak detection method, and avoid waste of grease.

Claims

1. A sealing leak detection method for a sealing device of a starting hole of a slurry shield machine, the sealing device comprising a short sleeve (2) arranged on a starting hole end (1), the short sleeve being sleeved on the outer side of a shield body (3) of the shield machine, a first sealing ring (4), a second sealing ring (5), and a third sealing ring (6) being arranged in sequence from inside to outside between the short sleeve and the shield body (3), the first sealing ring and the second sealing ring being arranged on an inner wall (201) of the short sleeve, the third sealing ring being arranged on an outer end surface (202) of the short sleeve, A door flap (7) is provided on the outer side of the third sealing ring, a sealing chamber (8) is formed between the first sealing ring (4) and the second sealing ring (5), a grease injection hole (9) is provided on the outer wall of the short sleeve of the sealing chamber, sealing grease is injected into the sealing chamber through the grease injection hole (9), the grease injection hole (9) is connected to a pressure air source through a switch valve (10), and the pressure air source is used to perform air leakage detection on the sealing chamber before injecting the sealing grease; before injecting the sealing grease into the sealing chamber, the sealing chamber is sealed and leak-checked, characterized in that The pressure gas source comprises a gas mixing tank (11), the gas mixing tank (11) is respectively connected to an air compressor (12) and an odor gas tank (13), a sealing film (15) is provided on the outside of the short sleeve, and the closed space enclosed by the sealing film and the short sleeve is connected to an odor detector (16) via a flexible leak detection pipeline (17), and the sealing leak detection method is: The first step is to open the switch (14) of the odor gas tank (13) to fill the odor gas into the mixing tank (11), and close the switch (14) after the pressure in the mixing tank reaches a set pressure value of the odor gas; The second step is to start the air compressor (12), open the switch valve (10) to charge the gas in the gas mixing tank into the sealed chamber (8), and maintain the detection pressure setting value; The third step is qualitative leak detection: turn on the odor detector (16). If there is no odor, or the odor concentration is less than the set value within a set time, it is considered that there is no leakage and the leak detection is completed. If there is odor and the odor concentration is equal to or greater than the set value within a set time, it is considered that there is a leakage, and the next step is to perform positioning leak detection; The fourth step is to locate and detect leaks: remove the sealing film (15), dismantle the tunnel door flap (7), turn the third sealing ring (6) outside, and use the trumpet-shaped gas gathering port (1701) provided at the end of the flexible leak detection pipe (17) to close the contact gap between the second sealing ring (5) and the shield body (3) of the shield machine to detect the leak point from bottom to top; Step 5: Repair the sealing ring and return to step 1 for re-inspection.

2. The method according to claim 1, characterized in that The first sealing ring (4) and the second sealing ring (5) are wire brush sealing rings, and sealing grease is manually filled into the wire brush sealing rings.

3. The method according to claim 2, characterized in that The sealing ring is repaired by withdrawing the shield body (3) of the shield machine, manually filling the sealing grease into the wire brush sealing ring, and then pushing the shield body (3) of the shield machine back in.

4. The method according to claim 2, characterized in that: One third of the length of the wire brush sealing ring is pressed inward by the shield body (3) of the shield machine as the shield body (3) of the shield machine is pushed in, and is closely attached to the outer side of the shield body (3).

5. The method according to claim 1, characterized in that The third sealing ring (6) is a rubber sealing ring. One third of the height of the rubber sealing ring is bent inward by the shield body (3) of the shield machine as the shield body (3) of the shield machine is pushed in, and is closely attached to the outer side of the shield body (3).

6. The method according to claim 1, characterized in that The pressure gas source comprises a gas mixing tank (11), the gas mixing tank (11) being connected to an air compressor and an odorous gas tank respectively, and the odorous gas in the odorous gas tank is fed into the gas mixing tank (11), mixed with air in the gas mixing tank (11) through the air compressor, and then pressed into the sealed chamber.

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