CN113153380A - Method for improving waterproof performance of pipe sheet joint in shield tunnel - Google Patents
Method for improving waterproof performance of pipe sheet joint in shield tunnel Download PDFInfo
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- CN113153380A CN113153380A CN202110539431.5A CN202110539431A CN113153380A CN 113153380 A CN113153380 A CN 113153380A CN 202110539431 A CN202110539431 A CN 202110539431A CN 113153380 A CN113153380 A CN 113153380A
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- sealing gaskets
- gaskets
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- femtosecond laser
- waterproof performance
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000007789 sealing Methods 0.000 claims abstract description 137
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000012545 processing Methods 0.000 claims abstract description 32
- 238000012360 testing method Methods 0.000 claims abstract description 27
- 238000004140 cleaning Methods 0.000 claims abstract description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000008213 purified water Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 3
- 238000004078 waterproofing Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 10
- 239000012535 impurity Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000002105 nanoparticle Substances 0.000 description 4
- 230000003075 superhydrophobic effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229960001948 caffeine Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- RYYVLZVUVIJVGH-UHFFFAOYSA-N trimethylxanthine Natural products CN1C(=O)N(C)C(=O)C2=C1N=CN2C RYYVLZVUVIJVGH-UHFFFAOYSA-N 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/385—Sealing means positioned between adjacent lining members
-
- B08B1/143—
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
Abstract
The invention discloses a method for improving the waterproof performance of a pipe sheet joint in a shield tunnel, and belongs to the technical field of waterproofing. The method comprises the following steps: cleaning the surfaces of the two primary sealing gaskets; placing the two cleaned primary sealing gaskets on a femtosecond laser processing table at the same time; respectively processing the opposite contact surfaces of the two primary sealing gaskets by femtosecond laser to obtain two secondary sealing gaskets, wherein the contact surfaces of the secondary sealing gaskets form micro-structure; based on the water seepage pressure, the two secondary sealing gaskets are subjected to a waterproof capability test; and placing the secondary sealing gasket passing the waterproof capability test in the joint of the pipe pieces in the shield tunnel so as to improve the waterproof performance of the joint of the pipe pieces. According to the method for improving the waterproof performance of the joints of the pipe slices in the shield tunnel, the hydrophobicity of the sealing gasket can be improved through the femtosecond laser, and the waterproof performance of the joints of the pipe slices in the shield tunnel is further improved.
Description
Technical Field
The invention belongs to the technical field of water prevention, and particularly relates to a method for improving the waterproof performance of a pipe sheet joint in a shield tunnel.
Background
The shield tunnel is a method for constructing the tunnel by using a shield machine, controlling an excavation surface and surrounding rocks not to collapse and destabilize, tunneling the tunnel and discharging slag, assembling duct pieces in the machine to form a lining, implementing grouting after the wall, and not disturbing the surrounding rocks.
Through installing sealed the pad at two adjacent section of jurisdiction seams, sealed pad is elastic structure, and its inside has a plurality of through-holes. The sealing gasket realizes static sealing by extruding and deforming the pipe piece.
In order to improve the waterproof performance of the elastic sealing gasket of the pipe piece joint, the waterproof performance is mainly realized by technical measures such as adjusting the overall dimension, the number of internal holes, the shape mode and the like of the elastic sealing gasket at present, and the research on the performance of the contact surface between the sealing gaskets is still blank. However, the practice shows that the leakage of the segment joint is mostly generated on the contact surface of the sealing gasket and the sealing gasket. Therefore, the improvement of the contact performance and the state between the contact surfaces of the sealing gasket is significant for improving the waterproof capability of the joint.
Disclosure of Invention
In view of the above defects or improvement needs in the prior art, the present invention provides a method for improving the waterproof performance of segment joints in a shield tunnel, and aims to improve the waterproof performance of segment joints in the shield tunnel.
The invention provides a method for improving the waterproof performance of a pipe sheet joint in a shield tunnel, which comprises the following steps:
cleaning the surfaces of the two primary sealing gaskets;
placing the two cleaned primary sealing gaskets on a femtosecond laser processing table at the same time;
respectively processing the opposite contact surfaces of the two primary sealing gaskets by femtosecond laser to obtain two secondary sealing gaskets, wherein a microstructure is formed on the contact surface of each secondary sealing gasket to improve the hydrophobicity of each secondary sealing gasket;
based on the water seepage pressure, testing the waterproof capability of the two secondary sealing gaskets, if the two secondary sealing gaskets pass the water seepage pressure, the two secondary sealing gaskets are qualified, and the waterproof performance under the water seepage pressure can be met, otherwise, performing femtosecond knife finishing again until the two secondary sealing gaskets pass the waterproof capability test;
and placing the secondary sealing gasket passing the waterproof capability test in the joint of the pipe piece in the shield tunnel so as to improve the waterproof performance of the joint of the pipe piece.
Optionally, the cleaning the two primary gaskets includes:
wiping the surfaces of the two primary gaskets with alcohol;
the surfaces of two of the primary gaskets are rinsed multiple times with purified water.
Optionally, after the rinsing the surfaces of the two primary gaskets with purified water a plurality of times, the method further comprises:
cleaning the two primary sealing gaskets by using ultrasonic equipment;
and drying the two primary sealing gaskets.
Optionally, before the step of simultaneously placing both of the cleaned primary gaskets on a femtosecond laser processing station, the method further comprises:
wiping the femtosecond laser processing station with alcohol.
Optionally, the microstructures comprise one or more of scale-shaped protrusions or wave-shaped protrusions.
Optionally, theIn the step of processing the contact surfaces of the two primary sealing gaskets opposite to each other by femtosecond laser, the processing energy of the femtosecond laser is 7.5J/cm2-15J/cm2。
Optionally, in the processing of the two opposite contact surfaces of the primary sealing gasket by femtosecond laser, an included angle is formed between the trend of the femtosecond laser and the central axis of the primary sealing gasket.
Optionally, the included angle is 30-45 °.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the method for improving the waterproof performance of the joint of the pipe piece in the shield tunnel, when the sealing performance of the joint of the pipe piece is improved, firstly, the surfaces of the two primary sealing gaskets are cleaned, so that the surface cleanliness is improved, and the situation that impurities interfere with femtosecond laser to influence the formation of a subsequent microstructure is avoided. Then, the two cleaned primary sealing gaskets are simultaneously arranged on a femtosecond laser processing table, so that an object stage is provided, and the subsequent femtosecond laser processing is facilitated. And then, the opposite contact surfaces of the two primary sealing gaskets are respectively processed by femtosecond laser to obtain two secondary sealing gaskets, and a microstructure is formed on the contact surface of each secondary sealing gasket, so that the hydrophobicity of the surface of each secondary sealing gasket is improved through the microstructure, and the waterproof performance of the contact surface between the sealing gaskets is improved. And then, based on the water seepage pressure, testing the waterproof capability of the two secondary sealing gaskets, if the two secondary sealing gaskets pass the water seepage pressure, the waterproof performance under the water seepage pressure can be met, otherwise, femtosecond knife finishing is carried out again until the waterproof capability test is passed, so that the secondary sealing gaskets capable of resisting the water seepage pressure are determined through the waterproof capability test, and the leakage is avoided in the subsequent use process. And finally, placing the secondary sealing gasket passing the waterproof capability test in the joint of the pipe pieces in the shield tunnel so as to improve the waterproof performance of the joint of the pipe pieces.
That is to say, according to the method for improving the waterproof performance of the joints of the pipe sheets in the shield tunnel, the hydrophobicity of the sealing gasket can be improved through the femtosecond laser, and the waterproof performance of the joints of the pipe sheets in the shield tunnel is further improved.
Drawings
Fig. 1 is a flowchart of a method for improving waterproof performance of a pipe sheet joint in a shield tunnel according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the use of a gasket provided in an embodiment of the present invention;
fig. 3 is a flowchart of another method for improving waterproof performance of a pipe sheet joint in a shield tunnel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a microstructure provided in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another microstructure provided in an embodiment of the present invention;
fig. 6 is a schematic diagram of a change in microstructure provided in an embodiment of the present invention.
The symbols in the drawings represent the following meanings:
1. a gasket; 2. a microstructure; 3. a duct piece; 4. water droplets; 5. and (4) segment seaming.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a flowchart of a method for improving waterproof performance of a pipe sheet joint in a shield tunnel according to an embodiment of the present invention, as shown in fig. 1, the method includes:
and S101, cleaning the surfaces of the two primary sealing gaskets.
And S102, simultaneously placing the two cleaned primary sealing gaskets on a femtosecond laser processing table.
S103, processing the opposite contact surfaces of the two primary sealing gaskets through femtosecond laser to obtain two secondary sealing gaskets, and forming a microstructure 2 on the contact surface of each secondary sealing gasket to improve the hydrophobicity of each secondary sealing gasket.
And S104, testing the waterproof capability of the two secondary sealing gaskets based on the water seepage pressure, wherein if the two secondary sealing gaskets pass the water seepage pressure, the waterproof performance under the water seepage pressure can be met, otherwise, performing femtosecond knife finishing again until the two secondary sealing gaskets pass the waterproof capability test.
It should be noted that the water seepage pressure is the water pressure of the water seepage corresponding to the target depth of the pipe piece in the tunnel.
And S105, placing the secondary sealing gasket passing the waterproof capability test in the segment joint 5 in the shield tunnel so as to improve the waterproof performance of the segment joint 5 (see figure 2).
For the method for improving the waterproof performance of the segment joint in the shield tunnel, when the sealing performance of the segment joint 5 is improved, firstly, the surfaces of the two primary sealing gaskets are cleaned, so that the surface cleanliness is improved, and the situation that impurities interfere with femtosecond laser to influence the formation of a subsequent microstructure 2 is avoided. Then, the two cleaned primary sealing gaskets are simultaneously arranged on a femtosecond laser processing table, so that an object stage is provided, and the subsequent femtosecond laser processing is facilitated. And then, the opposite contact surfaces of the two primary sealing gaskets are respectively processed by femtosecond laser to obtain two secondary sealing gaskets, and a microstructure 2 is formed on the contact surface of each secondary sealing gasket, so that the hydrophobicity of the surface of each secondary sealing gasket is improved by the microstructure 2, and the waterproof performance of the contact surface between the sealing gaskets 1 is further improved. And then, based on the water seepage pressure, testing the waterproof capability of the two secondary sealing gaskets, if the two secondary sealing gaskets pass the water seepage pressure, the waterproof performance under the water seepage pressure can be met, otherwise, femtosecond knife finishing is carried out again until the waterproof capability test is passed, so that the secondary sealing gaskets capable of resisting the water seepage pressure are determined through the waterproof capability test, and the leakage is avoided in the subsequent use process. And finally, placing the secondary sealing gasket passing the waterproof capability test in the segment joint 5 in the shield tunnel so as to improve the waterproof performance of the segment joint 5.
That is to say, according to the method for improving the waterproof performance of the tube sheet joint in the shield tunnel, the hydrophobicity of the sealing gasket 1 can be improved through the femtosecond laser, and the waterproof performance of the tube sheet joint 5 in the shield tunnel is further improved.
It should be noted that, the femtosecond laser processing of the surface of the gasket 1 can not only improve the hydrophobic property thereof, but also improve the surface roughness and friction coefficient of the gasket 1, and these properties can also improve the waterproof property of the contact surface of the gasket 1.
Fig. 3 is a flowchart of another method for improving waterproof performance of a pipe sheet joint in a shield tunnel according to an embodiment of the present invention, as shown in fig. 3, the method includes:
and S301, wiping the surfaces of the two primary sealing gaskets by alcohol.
In the above embodiment, impurities on the surfaces of the two primary gaskets can be preliminarily removed by alcohol. In addition, alcohol is volatile and does not form a residue on the surface of the primary gasket.
And S302, washing the surfaces of the two primary sealing gaskets for multiple times by using purified water.
In the above embodiment, impurities on the surface of the primary gasket can be further removed by purified water.
And S303, cleaning the two primary sealing gaskets through ultrasonic equipment.
In the above embodiment, impurities that are not easily removed from the surface of the primary seal gasket can be further removed by the ultrasonic device.
And S304, drying the two primary sealing gaskets.
S305, wiping the femtosecond laser processing table through alcohol.
In the above embodiment, by wiping the femtosecond laser processing table with alcohol, contamination of the surface of the primary gasket by impurities on the femtosecond laser processing table can be avoided.
S306, simultaneously placing the two cleaned primary sealing gaskets on a femtosecond laser processing table.
S307, the opposite contact surfaces of the two primary sealing gaskets are respectively processed through femtosecond laser to obtain two secondary sealing gaskets, and a microstructure 2 is formed on the contact surface of each secondary sealing gasket to improve the hydrophobicity of each secondary sealing gasket.
In the present embodiment, the microstructures 2 comprise one or more of scale-shaped protrusions (see fig. 4) or wave-shaped protrusions (see fig. 5).
In the above embodiment, the scale-shaped protrusions or the corrugated protrusions have good hydrophobicity.
Alternatively, the processing energy of the femtosecond laser may be 7.5J/cm2-15J/cm2。
Optionally, the trend of the femtosecond laser forms an included angle with the central axis of the primary sealing gasket, so that the processing precision and the processing efficiency can be improved
Illustratively, the included angle is 30-45 °.
The following briefly describes four stages of the change of the microstructure 2 on the surface of the gasket 1 at the time of femtosecond laser processing, and the change of the superhydrophobicity of the surface of the gasket 1 at these four stages (see fig. 6).
In the first stage, as the elastic sealing gasket 1 used at the joint of the shield tunnel is composed of high molecular polymer, under the action of femtosecond laser, the longer molecular chain can be broken to form short molecular chain, a large-particle structure is generated on the surface of the sealing gasket 1 on a macroscopic level, and uneven small-particle structures are dispersed on the large-particle structure. The super hydrophobicity of the surface of the sealing gasket 1 shows that the water drops 4 are in direct contact with the large and small particle composite structure of the surface of the sealing gasket 1, the gaps of the surface of the sealing gasket 1 are filled, and the sealing gasket is in a close contact state, namely the super hydrophobicity of the surface of the sealing gasket 1 is not obviously changed.
In the second stage, with the further rise of the femtosecond laser energy, the surface of the sealing gasket 1 is irregularly and unevenly cracked, and the large-particle structure is pyrolyzed into a small-particle structure and irregularly distributed on the surface of the sealing gasket 1. The super-hydrophobicity of the sealing gasket 1 is shown in the way that water drops 4 are in contact with the small particles on the uppermost layer of the microstructure 2 on the surface of the sealing gasket to form a primary super-hydrophobic surface.
In the third stage, the surface of the sealing gasket 1 continuously undergoes pyrolysis reaction, a plate-shaped structure with an irregular shape appears on the surface, gullies are formed, small particles are continuously decomposed into smaller micro-nano particles which are distributed on the uppermost layer of the surface of the sealing gasket 1, the lower layer is also small particles, and the microstructure 2 on the surface of the sealing gasket 1 is represented as a composite structure of the plate shape and the small particles. At this stage, the superhydrophobicity of the sealing gasket 1 shows that the liquid drops are only in contact with the micro-nano particle surface on the outermost surface of the sealing gasket 1, that is, the superhydrophobic performance on the surface of the sealing gasket 1 is improved, and a superhydrophobic surface of a certain degree is formed.
And in the fourth stage, when the input laser energy and the pyrolysis process of the surface of the sealing gasket 1 reach dynamic equilibrium, the surface of the sealing gasket 1 can form a stable microstructure 2. The microstructure 2 is a plate-shaped structure, and the micro-nano particle structures are distributed on the surface of the plate-shaped structure, the gullies on the surface of the sealing gasket 1 and the like. Namely, a stable microstructure 2 is formed on the surface of the sealing gasket 1 at the stage, and the superhydrophobicity of the sealing gasket 1 shows that the water drops 4 only contact with the micro-nano particles on the uppermost layer of the surface of the sealing gasket 1, so that the superhydrophobicity is further improved. I.e. the surface of the gasket 1 obtains a stable superhydrophobic property at this stage.
That is, after the gasket 1 is treated by the femtosecond laser, it is known that the surface microstructure 2 of the gasket is changed, the surface properties such as superhydrophobicity are changed, and the surface roughness and the friction coefficient of the gasket 1 are also changed accordingly.
And S308, testing the waterproof capability of the two secondary sealing gaskets based on the water seepage pressure, wherein if the two secondary sealing gaskets pass the water seepage pressure, the waterproof performance under the water seepage pressure can be met, otherwise, performing femtosecond knife finishing again until the two secondary sealing gaskets pass the waterproof capability test.
In the embodiment, the secondary sealing gasket capable of resisting the water seepage pressure is determined through the waterproof capability test, so that the leakage in the subsequent use process is avoided.
S309, placing the secondary sealing gasket passing the waterproof capability test in the segment joint 5 in the shield tunnel to improve the waterproof performance of the segment joint 5.
For the method for improving the waterproof performance of the segment joint in the shield tunnel, when the sealing performance of the segment joint 5 is improved, firstly, the surfaces of the two primary sealing gaskets are cleaned, so that the surface cleanliness is improved, and the situation that impurities interfere with femtosecond laser to influence the formation of a subsequent microstructure 2 is avoided. Then, the two cleaned primary sealing gaskets are simultaneously arranged on a femtosecond laser processing table, so that an object stage is provided, and the subsequent femtosecond laser processing is facilitated. And then, the opposite contact surfaces of the two primary sealing gaskets are respectively processed by femtosecond laser to obtain two secondary sealing gaskets, and a microstructure 2 is formed on the contact surface of each secondary sealing gasket, so that the hydrophobicity of the surface of each secondary sealing gasket is improved by the microstructure 2, and the waterproof performance of the contact surface between the sealing gaskets 1 is further improved. And then, based on the water seepage pressure, testing the waterproof capability of the two secondary sealing gaskets, if the two secondary sealing gaskets pass the water seepage pressure, the waterproof performance under the water seepage pressure can be met, otherwise, femtosecond knife finishing is carried out again until the waterproof capability test is passed, so that the secondary sealing gaskets capable of resisting the water seepage pressure are determined through the waterproof capability test, and the leakage is avoided in the subsequent use process. And finally, placing the secondary sealing gasket passing the waterproof capability test in the segment joint 5 in the shield tunnel so as to improve the waterproof performance of the segment joint 5.
That is to say, according to the method for improving the waterproof performance of the tube sheet joint in the shield tunnel, the hydrophobicity of the sealing gasket 1 can be improved through the femtosecond laser, and the waterproof performance of the tube sheet joint 5 in the shield tunnel is further improved.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for improving waterproof performance of a pipe sheet joint in a shield tunnel, the method comprising:
cleaning the surfaces of the two primary sealing gaskets;
placing the two cleaned primary sealing gaskets on a femtosecond laser processing table at the same time;
respectively processing the opposite contact surfaces of the two primary sealing gaskets by femtosecond laser to obtain two secondary sealing gaskets, wherein a microstructure is formed on the contact surface of each secondary sealing gasket to improve the hydrophobicity of each secondary sealing gasket;
based on the water seepage pressure, testing the waterproof capability of the two secondary sealing gaskets, if the two secondary sealing gaskets pass the water seepage pressure, the two secondary sealing gaskets are qualified, and the waterproof performance under the water seepage pressure can be met, otherwise, performing femtosecond knife finishing again until the two secondary sealing gaskets pass the waterproof capability test;
and placing the secondary sealing gasket passing the waterproof capability test in the joint of the pipe piece in the shield tunnel so as to improve the waterproof performance of the joint of the pipe piece.
2. The method for improving the waterproof performance of the pipe sheet joint in the shield tunnel according to claim 1, wherein the cleaning treatment is performed on the two primary sealing gaskets and comprises the following steps:
wiping the surfaces of the two primary gaskets with alcohol;
the surfaces of two of the primary gaskets are rinsed multiple times with purified water.
3. The method for improving the waterproof performance of the pipe sheet joint in the shield tunnel according to claim 2, wherein after the multiple rinsing of the surfaces of the two primary sealing gaskets with purified water, the method further comprises:
cleaning the two primary sealing gaskets by using ultrasonic equipment;
and drying the two primary sealing gaskets.
4. The method of claim 1, wherein before both of the cleaned primary gaskets are simultaneously placed on the femtosecond laser processing station, the method further comprises:
wiping the femtosecond laser processing station with alcohol.
5. The method of claim 1, wherein the microstructures comprise one or more of scale-shaped protrusions or wave-shaped protrusions.
6. The method of claim 1, wherein the opposing contact surfaces of the two primary sealing gaskets are respectively processed by a femtosecond laser with a processing energy of 7.5J/cm2-15J/cm2。
7. The method of claim 1, wherein the femtosecond laser is used to form an angle with the central axis of the primary sealing gasket during the processing of the two opposite contact surfaces of the primary sealing gasket.
8. The method of claim 7, wherein the included angle is 30-45 °.
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| CN202110539431.5A CN113153380B (en) | 2021-05-18 | 2021-05-18 | Method for improving waterproof performance of pipe sheet joint in shield tunnel |
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