CN107642100A - Apparatus and method for FS final spice engagement cavity draining - Google Patents
Apparatus and method for FS final spice engagement cavity draining Download PDFInfo
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- CN107642100A CN107642100A CN201710779855.2A CN201710779855A CN107642100A CN 107642100 A CN107642100 A CN 107642100A CN 201710779855 A CN201710779855 A CN 201710779855A CN 107642100 A CN107642100 A CN 107642100A
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- engagement cavity
- pipeline
- draining
- final spice
- pressure
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Abstract
The invention discloses the device for FS final spice engagement cavity draining,The immersed tube end seal door that FS final spice is connected is provided with first passage and second channel,First passage is located at the bottom of end seal door,Second channel is located at the top of end seal door,First passage connects the engagement cavity and immersed tube of end seal door both sides with second channel,Air accumulator is provided with immersed tube pipe,Water tank,First pipeline,Second pipe and the 3rd pipeline,First pipeline communication first passage and water tank,Second pipe connects second channel and water tank,First pipeline is provided with the first stop valve,Second stop valve and first pressure table,First pressure table and the first stop valve are close to end seal door,The first pipeline between first stop valve and the second stop valve connects one end of the 3rd pipeline,The other end connection air accumulator of 3rd pipeline,3rd pipeline is provided with the 3rd stop valve,Air accumulator is provided with the first intake valve,Air bleeding valve,Draining valve and second pressure gauge,Second pipe is provided with the second intake valve.
Description
Technical field
The present invention relates to Construction of Submarine Tunnel field, more particularly to a kind of device for FS final spice engagement cavity draining and
Method.
Background technology
Immersed tunnelling method constructing tunnel, exactly partly latent refute or dry-docking in prefabricated tunnel caisson difference transportation by driving to making a reservation for
The docking of position sinking, is longer than the metric space of the pipeline section to make the sinking of final section pipeline section smoothly to leave, the remainder away from
Pipeline section from the sinking docking of space institute is considered as the equal Immersed tunnel in both ends of FS final spice, i.e. tunnel connection, and in marine docking
Close up, the last pipeline section that closes up is FS final spice.The immersed tube tunnel final joint is the key of immersed tube tunnel construction, particularly
Off-lying sea overlength immersed tube tunnel construction, job site operating condition is difficult, is faced with the marine environment bars such as wave and the ocean current of complexity
Part and meteorological condition.
As shown in figure 1, single-unit immersed tube 2 crimps when being docked with the immersed tube 2 being installed in place for waterpower, two section immersed tube 2 are opened
Begin to dock, the ring-type GINA waterstops 7 of the end face of immersed tube 2 to be installed connection are brought into close contact in the immersed tube 2 being installed in place, two sections
Engagement cavity 6 is formed between two end seal doors 5 of immersed tube 2, as part water is discharged in engagement cavity 6, acts on to be installed sink
Hydraulic pressure (as shown in lateral arrows in Fig. 1) pushing tow of the other end of pipe 2 immersed tube 2, the space of engagement cavity 6 reduce, engagement cavity 6 during draining
Interior pressure is progressively steadily reduced to atmospheric pressure (0.1MPa), acts on the hydraulic pressure of GINA waterstops 7 (such as vertical arrow institute in Fig. 1
Show) it is steady with the internal pressure of engagement cavity 6, GINA waterstops 7 will not be caused, which to turn on one's side or tear, causes the docking failure of immersed tube 2.
As shown in Fig. 2 FS final spice 1 saves docking for immersed tube 2 with the two of its both sides, due to there is no end hydraulic pressure, can not adopt
The mode docked with above-mentioned hydraulic pressure, FS final spice 1 is after setting to the centre of two section immersed tube 2 and adjusting good position, 1 liang of FS final spice
Hold the two pushing tow girders set respectively to drive the GINA waterstops 7 each connected to contact and stay on the corresponding end face of immersed tube 2,
FS final spice 1 and two section immersed tube 2 of its both sides form two engagement cavities 6, and due to losing the effect of end hydraulic pressure, the two connect
Respective space invariance when closing 6 draining of chamber, pressure drop in engagement cavity 6 during draining, with external action in the hydraulic pressure of GINA waterstops 7
Exist (as shown in vertical arrow in Fig. 2) instantaneous differential pressure so as to pushing tow girder produce impact, cause GINA waterstops 7 turn on one's side or
Tear causes the docking failure of immersed tube 2.
Therefore, the both sides engagement cavity 6 of FS final spice 1 can not use the mode of the existing two section docking drainings of immersed tube 2 in draining,
Need to take new tool to make pressure in engagement cavity 6 progressively steadily be reduced to atmospheric pressure, prevent GINA waterstops 7 are turned on one's side or torn from leading
Cause the docking failure of immersed tube 2.
The content of the invention
It is an object of the invention to overcome the FS final spice both sides engagement cavity in the presence of prior art can not in draining
Using the mode of existing two section immersed tube docking drainings, it is necessary to take new tool pressure in engagement cavity is progressively steadily reduced to air
Pressure, prevent the above-mentioned deficiency that GINA waterstops are turned on one's side or tear causes immersed tube docking to fail, there is provided one kind connects for FS final spice
The apparatus and method for closing chamber draining.
In order to realize foregoing invention purpose, the invention provides following technical scheme：
A kind of device for FS final spice engagement cavity draining, the end seal door for the immersed tube being connected with FS final spice are provided with
First passage and second channel, the first passage are located at the bottom of the end seal door, and the second channel is located at the end seal
The top of door, the first passage are used to connect the engagement cavity of the end seal door both sides and the immersed tube with the second channel
In pipe, air accumulator, water tank, the first pipeline, second pipe and the 3rd pipeline are provided with the immersed tube pipe, first pipeline is used for
Connecting the first passage and the water tank, the second pipe is used to connecting the second channel and the water tank, and described the
One pipeline is provided with the first stop valve, the second stop valve and first pressure table, the first pressure table and first stop valve
The end seal door is close to, first pipeline connection the described 3rd between first stop valve and second stop valve
One end of pipeline, the other end of the 3rd pipeline connect the air accumulator, and the 3rd pipeline is provided with the 3rd stop valve, institute
State air accumulator and be provided with the first intake valve, air bleeding valve, draining valve and second pressure gauge, the second pipe is provided with the second air inlet
Valve.
Using the device of the present invention for FS final spice engagement cavity draining, by adjusting each valve and setting institute
Air accumulator is stated to balance the internal pressure during engagement cavity draining, the engagement cavity internal pressure is steadily gradually reduced, is prevented
Only drainage speed causes the engagement cavity pressure rapid drawdown soon, and instantaneous differential pressure at the FS final spice and the immersed tube contiguity to producing
Raw impact, cause GINA waterstops to turn on one's side or tear, cause the FS final spice and the immersed tube to dock failure, the apparatus structure
Simply, it is easy to use, stable performance, work well.
Preferably, connecting pipe is provided with the FS final spice, the connecting pipe is used to connect the FS final spice
Two engagement cavities of both sides, the immersed tube of the FS final spice side set the air accumulator.
Preferably, air compressor machine is additionally provided with the immersed tube pipe, first intake valve connects the air compressor machine.
Preferably, ballast pump is additionally provided with the immersed tube pipe, the ballast pump is connected to first pipeline.
Present invention also offers a kind of method for FS final spice engagement cavity draining, using as described in any of the above item
For the device of FS final spice engagement cavity draining, comprise the following steps：
A, original state, all valves are closed mode；
B, first intake valve is opened, gas is inputted to the air accumulator with air compressor machine, surveys the first pressure table
Pressure value be equal to the pressure value that measures of the second pressure gauge, i.e., pressure, which is equal in the air accumulator, in described engagement cavity presses
Power, close the air compressor machine；
C, first stop valve and the 3rd stop valve are opened, connects the engagement cavity and the air accumulator；
D, the air bleeding valve is opened, controls the aperture of the air bleeding valve to be exhausted, observes the first pressure table and institute
The change of second pressure gauge monitor value is stated, 0.07-0.1MPa is reduced to pressure, now the engagement cavity reclaimed water enters the storage
In gas tank；
E, the 3rd stop valve is closed, opens the draining valve, the air accumulator reclaimed water is discharged, is then shut off described
Air bleeding valve and the draining valve；
F, second intake valve is opened, air enters the engagement cavity, while the water in the engagement cavity is by described the
Two pipelines flow into the water tank；
G, when water does not flow into the water tank from the second pipe, second stop valve is opened, in the engagement cavity
Remaining water flows into the water tank by first pipeline.
Using the method for the present invention for FS final spice engagement cavity draining, using the air accumulator and each valve
Coordinate adjustment described in engagement cavity draining when internal pressure, first steadily gradually reduce the engagement cavity with the air accumulator
Internal pressure draining, then make connection air inside the engagement cavity with the second pipe air inlet draining, finally with described first
Pipe drainage, the steady discharge of the whole engagement cavity reclaimed water is completed, do not cause instantaneous differential pressure impact GINA waterstops to cause institute
FS final spice and immersed tube docking failure are stated, this method clear principle, step is simple, works well, and is easy to promote.
Preferably, before starting to perform the step A, diving confirms two ring-types that the FS final spice both ends are set
It is not mingled with foreign matter between GINA waterstops nose and the corresponding immersed tube end.
Preferably, before starting to perform the step A, the air accumulator pressurization carries out airtight test, and described in inspection
First pipeline, the second pipe, the valvular air-tightness of the 3rd pipeline and institute and watertightness.
Preferably, before starting to perform the step A, initial pressure and the second pressure to the first pressure table
The initial pressure of table is demarcated.
Preferably, when performing the step G, remaining water in the engagement cavity is evacuated to the water tank with ballast pump.
Preferably, after completing the step G, confirm that the watertight situation of the engagement cavity meets design requirement, using sweeping storehouse
Pump discharges remaining water in the engagement cavity.
Preferably, the engagement cavity reclaimed water drains into the water tank, is gone out the Water in Water Tanks by immersed tube tunnel with immersible pump
The discharge of mouth end.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1st, with the device of the present invention for FS final spice engagement cavity draining, by adjusting each valve and setting
The air accumulator balances the internal pressure during engagement cavity draining, the engagement cavity internal pressure is steadily gradually reduced,
Prevent drainage speed cause soon it is described engagement cavity pressure rapid drawdown, instantaneous differential pressure to the FS final spice and the immersed tube contiguity at
Impact is produced, causes GINA waterstops to turn on one's side or tear, causes the FS final spice and the immersed tube to dock failure, the device knot
Structure is simple, easy to use, stable performance, works well；
2nd, with the method for the present invention for FS final spice engagement cavity draining, using the air accumulator and each valve
Internal pressure described in the cooperation adjustment of door during engagement cavity draining, first steadily gradually reduces the engagement with the air accumulator
Intracavitary portion pressure drainage, then make connection air inside the engagement cavity with the second pipe air inlet draining, finally with described the
One pipe drainage, the steady discharge of the whole engagement cavity reclaimed water is completed, do not cause instantaneous differential pressure impact GINA waterstops to cause
The FS final spice and immersed tube docking failure, this method clear principle, step is simple, works well, and is easy to promote.
Brief description of the drawings
Fig. 1 is the schematic diagram of existing two section immersed tube waterpower crimping；
Fig. 2 is the schematic diagram that FS final spice docks with both sides immersed tube；
Fig. 3 is the structural representation of the device of the present invention for FS final spice engagement cavity draining；
Fig. 4 is the flow chart of the method for the present invention for FS final spice engagement cavity draining.
Marked in figure：1- FS final spices, 2- immersed tube, 3- air accumulators, 31- intake valves, 32- air bleeding valves, 33- draining valves, 34-
Second pressure gauge, 4- water tanks, the pipelines of 41- first, the stop valves of 411- first, the stop valves of 412- second, the stop valves of 413- the 3rd,
42- second pipes, the intake valves of 421- second, the pipelines of 43- the 3rd, 5- end seal doors, 51- first passages, 52- second channels, 53-
One pressure gauge, 6- engagement cavities, 7-GINA waterstops.
Embodiment
With reference to test example and embodiment, the present invention is described in further detail.But this should not be understood
Following embodiment is only limitted to for the scope of the above-mentioned theme of the present invention, it is all that this is belonged to based on the technology that present invention is realized
The scope of invention.
Embodiment 1
As shown in figure 3, the device of the present invention for FS final spice engagement cavity draining, is connected with FS final spice 1
The end seal door 5 of immersed tube 2 be provided with first passage 51 and second channel 52.
The first passage 51 is located at the bottom of the end seal door 5, and the second channel 52 is located at the upper of the end seal door 5
Portion, the first passage 51 and the second channel 52 are used to connect the engagement cavity 6 of the both sides of end seal door 5 and the immersed tube
In 2 pipes, the immersed tube 2 manage in be provided with air accumulator 3, water tank 4, the first pipeline 41, the pipeline 43 of second pipe 42 and the 3rd, described the
One pipeline 41 is used to connect the first passage 51 and the water tank 4, and the second pipe 42 is used to connect the second channel
52 and the water tank 4, first pipeline 41 be provided with the first stop valve 411, the second stop valve 412 and first pressure table 53,
The first pressure table 53 and first stop valve 411 are close to the end seal door 5, first stop valve 411 and described
First pipeline 41 between second stop valve 412 connects one end of the 3rd pipeline 43, the 3rd pipeline 43 it is another
One end connects the air accumulator 3, and the 3rd pipeline 43 is provided with the 3rd stop valve 413, and the air accumulator 3 enters provided with first
Air valve 31, air bleeding valve 32, draining valve 33 and second pressure gauge 34, the second pipe 42 are provided with the second intake valve 421.
As a preferred scheme of the present embodiment, connecting pipe, the connecting pipe are provided with the FS final spice 1
For connecting two engagement cavities 6 of the both sides of FS final spice 1, the immersed tube 2 of the side of FS final spice 1 sets institute
State air accumulator 3.
As a preferred scheme of the present embodiment, the immersed tube 2 manage in be additionally provided with air compressor machine, first intake valve 31
Connect the air compressor machine.The immersed tube 2 is additionally provided with ballast pump in managing, and the ballast pump is connected to first pipeline 41.
With the device of the present invention for FS final spice engagement cavity draining, by adjusting each valve and setting institute
Air accumulator 3 is stated to balance internal pressure during 6 draining of engagement cavity, the internal pressure of engagement cavity 6 is steadily gradually reduced,
Prevent that drainage speed from causing pressure drop in the engagement cavity 6 soon, instantaneous differential pressure is close to the FS final spice 1 and the immersed tube 2
Meet place and produce impact, cause GINA waterstops 7 to turn on one's side or tear, cause FS final spice 1 and the immersed tube 2 the docking failure,
The apparatus structure is simple, easy to use, stable performance, works well.
Embodiment 2
As shown in Figure 3-4, the method for the present invention for FS final spice engagement cavity draining, using such as institute of embodiment 1
The device for FS final spice engagement cavity draining stated, comprises the following steps：
A, original state, all valves are closed mode；
B, first intake valve 31 is opened, gas is inputted to the air accumulator 3 with air compressor machine, makes the first pressure table
53 pressure values measured are equal to the pressure value that the second pressure gauge 34 measures, i.e., pressure is equal to the storage in described engagement cavity 6
Pressure in gas tank 3, close the air compressor machine；
C, first stop valve 411 and the 3rd stop valve 413 are opened, connects the engagement cavity 6 and the gas storage
Tank 3；
D, the air bleeding valve 32 is opened, controls the aperture of the air bleeding valve 32 to be exhausted, observes the first pressure table
53 and the change of the monitor value of the second pressure gauge 34,0.07MPa is reduced to pressure, now the reclaimed water of engagement cavity 6 enters
In the air accumulator 3；
E, the 3rd stop valve 413 is closed, opens the draining valve 33, the reclaimed water of air accumulator 3 is discharged, Ran Houguan
Close the air bleeding valve 32 and the draining valve 33；
F, second intake valve 421 is opened, air enters the engagement cavity 6, while the water in the engagement cavity 6 is by institute
State second pipe 42 and flow into the water tank 4；
G, when water does not flow into the water tank 4 from the second pipe 42, second stop valve 412 is opened, it is described to connect
Close remaining water in chamber 6 and the water tank 4 is flowed into by first pipeline 41.
As a preferred scheme of the present embodiment, before starting to perform the step A, diving confirms the FS final spice
It is not mingled with foreign matter between two noses of ring-type GINA waterstops 7 of 1 both ends setting and the corresponding end of immersed tube 2.The storage
Gas tank 3 is forced into 0.4MPa and carries out airtight test, and checks first pipeline 41, the second pipe 42, the described 3rd
Pipeline 43 and institute valvular air-tightness and watertightness.Initial pressure and the second pressure to the first pressure table 53
The initial pressure of table 34 is demarcated.
As a preferred scheme of the present embodiment, when performing the step G, will be remained with ballast pump in the engagement cavity 6
Remaining water is evacuated to the water tank 4.After completing the step G, confirm that the watertight situation of the engagement cavity 6 meets design requirement, adopt
Remaining water in the engagement cavity 6 is discharged with stripping pump.The reclaimed water of engagement cavity 6 drains into the water tank 4, with immersible pump by the water
The reclaimed water of case 4 is discharged by the immersed tube tunnel port of export.
With the method for the present invention for FS final spice engagement cavity draining, using the air accumulator 3 and each valve
Internal pressure described in the cooperation adjustment of door during 6 draining of engagement cavity, first steadily gradually reduces described connect with the air accumulator 3
The internal pressure draining of chamber 6 is closed, then makes the inside of the engagement cavity 6 connection air with the air inlet draining of second pipe 42, is finally used
The draining of first pipeline 41, the steady discharge of the whole reclaimed water of engagement cavity 6 is completed, do not cause instantaneous differential pressure impact GINA to stop
Water band 7 causes FS final spice 1 and the immersed tube 2 the docking failure, and this method clear principle, step is simple, works well, just
In popularization.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. device for FS final spice engagement cavity draining, it is characterised in that the immersed tube being connected with FS final spice (1) (2) end seal door (5) is provided with first passage (51) and second channel (52), and the first passage (51) is located at the end seal door (5) bottom, the second channel (52) are located at the top of the end seal door (5), the first passage (51) and described second Passage (52) is used to connect in the engagement cavity (6) and the immersed tube (2) pipe of end seal door (5) both sides, immersed tube (2) pipe It is interior to be provided with air accumulator (3), water tank (4), the first pipeline (41), second pipe (42) and the 3rd pipeline (43), first pipeline (41) it is used to connect the first passage (51) and the water tank (4), the second pipe (42) is logical for connecting described second Road (52) and the water tank (4), first pipeline (41) are provided with the first stop valve (411), the second stop valve (412) and the One pressure gauge (53), the first pressure table (53) and first stop valve (411) are close to the end seal door (5), described First pipeline (41) between first stop valve (411) and second stop valve (412) connects the 3rd pipeline (43) one end, the other end of the 3rd pipeline (43) connect the air accumulator (3), and the 3rd pipeline (43) is provided with the Three stop valves (413), the air accumulator (3) are provided with the first intake valve (31), air bleeding valve (32), draining valve (33) and the second pressure Power table (34), the second pipe (42) are provided with the second intake valve (421).
- 2. the device according to claim 1 for FS final spice engagement cavity draining, it is characterised in that the FS final spice (1) connecting pipe is provided with, the connecting pipe is used for two engagement cavities for connecting the FS final spice (1) both sides (6), the immersed tube (2) of FS final spice (1) side sets the air accumulator (3).
- 3. the device for FS final spice engagement cavity draining according to claim any one of 1-2, it is characterised in that described Ballast pump is additionally provided with immersed tube (2) pipe, the ballast pump is connected to first pipeline (41).
- A kind of 4. method for FS final spice engagement cavity draining, using being used for finally as described in claim any one of 1-3 The device of joint engagement cavity draining, it is characterised in that comprise the following steps：A, original state, all valves are closed mode；B, first intake valve (31) is opened, gas is inputted to the air accumulator (3) with air compressor machine, makes the first pressure table (53) pressure value measured is equal to the pressure value that the second pressure gauge (34) measures, i.e., pressure is equal in described engagement cavity (6) Pressure in the air accumulator (3), closes the air compressor machine；C, first stop valve (411) and the 3rd stop valve (413) are opened, connects the engagement cavity (6) and the storage Gas tank (3)；D, the air bleeding valve (32) is opened, controls the aperture of the air bleeding valve (32) to be exhausted, observes the first pressure table (53) and the second pressure gauge (34) monitor value change, be reduced to 0.07-0.1MPa to pressure；E, the 3rd stop valve (413) is closed, opens the draining valve (33), the air accumulator (3) reclaimed water is discharged, then Close the air bleeding valve (32) and the draining valve (33)；F, open second intake valve (421), air enters the engagement cavity (6), while the water in the engagement cavity (6) by The second pipe (42) flows into the water tank (4)；G, when water does not flow into water tank (4) from the second pipe (42), second stop valve (412) is opened, it is described Remaining water flows into the water tank (4) by first pipeline (41) in engagement cavity (6).
- 5. the method according to claim 4 for FS final spice engagement cavity draining, it is characterised in that start described in execution Before step A, diving confirms two ring-type GINA waterstops (7) noses of FS final spice (1) the both ends setting and corresponding institute State and be not mingled with foreign matter between immersed tube (2) end.
- 6. the method according to claim 4 for FS final spice engagement cavity draining, it is characterised in that start described in execution Before step A, air accumulator (3) pressurization carries out airtight test, and checks first pipeline (41), the second pipe (42), the valvular air-tightness of the 3rd pipeline (43) and institute and watertightness.
- 7. the method according to claim 4 for FS final spice engagement cavity draining, it is characterised in that start described in execution Before step A, the initial pressure of initial pressure and the second pressure gauge (34) to the first pressure table (53) is carried out Demarcation.
- 8. the method according to claim 4 for FS final spice engagement cavity draining, it is characterised in that perform the step During G, remaining water in the engagement cavity (6) is evacuated to the water tank (4) with ballast pump.
- 9. the method according to claim 4 for FS final spice engagement cavity draining, it is characterised in that complete the step After G, confirm that the watertight situation of the engagement cavity (6) meets design requirement, arranged remaining water in the engagement cavity (6) using stripping pump Go out.
- 10. the method for FS final spice engagement cavity draining according to claim any one of 4-9, it is characterised in that institute State engagement cavity (6) reclaimed water and drain into the water tank (4), discharged the water tank (4) reclaimed water by the immersed tube tunnel port of export with immersible pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710779855.2A CN107642100B (en) | 2017-09-01 | 2017-09-01 | Device and method for the draining of FS final spice engagement cavity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710779855.2A CN107642100B (en) | 2017-09-01 | 2017-09-01 | Device and method for the draining of FS final spice engagement cavity |
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| Publication Number | Publication Date |
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| CN107642100A true CN107642100A (en) | 2018-01-30 |
| CN107642100B CN107642100B (en) | 2019-06-07 |
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ID=61110690
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710779855.2A Active CN107642100B (en) | 2017-09-01 | 2017-09-01 | Device and method for the draining of FS final spice engagement cavity |
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| CN (1) | CN107642100B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113529796A (en) * | 2021-05-21 | 2021-10-22 | 中交三航局第二工程有限公司 | Suspended tunnel joint device |
| CN115046537A (en) * | 2022-08-17 | 2022-09-13 | 中交第一航务工程局有限公司 | Underwater check method for closure attitude of immersed tunnel |
| CN115748820A (en) * | 2023-01-10 | 2023-03-07 | 中交第一航务工程局有限公司 | Pushing type final joint cavity drainage method |
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| KR100921188B1 (en) * | 2009-04-15 | 2009-10-13 | (주)대우건설 | Connecting structure and connecting methods of immersed tunnel |
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| CN113529796A (en) * | 2021-05-21 | 2021-10-22 | 中交三航局第二工程有限公司 | Suspended tunnel joint device |
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| CN115046537B (en) * | 2022-08-17 | 2022-10-25 | 中交第一航务工程局有限公司 | Underwater check method for closure attitude of immersed tunnel |
| CN115748820A (en) * | 2023-01-10 | 2023-03-07 | 中交第一航务工程局有限公司 | Pushing type final joint cavity drainage method |
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| Publication number | Publication date |
|---|---|
| CN107642100B (en) | 2019-06-07 |
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