CN110067565A - A method of acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction - Google Patents
A method of acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction Download PDFInfo
- Publication number
- CN110067565A CN110067565A CN201910409898.0A CN201910409898A CN110067565A CN 110067565 A CN110067565 A CN 110067565A CN 201910409898 A CN201910409898 A CN 201910409898A CN 110067565 A CN110067565 A CN 110067565A
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- Prior art keywords
- shield
- ventral brush
- jurisdiction
- brush
- section
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Classifications
-
- 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
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- 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
- E21D11/381—Setting apparatus or devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0635—Tail sealing means, e.g. used as end shuttering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
Abstract
The invention belongs to Shield Construction Technique fields, more particularly to a kind of method for acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction, it solves rich water sandy silt soil stratum exchanging shield ventral brush construction in the prior art and shield tail portion flowing water easily occurs, the problem of gushing the safety accidents such as sand, shield stop position and propelling cylinder stroke are calculated first, then Xiang Tucang, bentonite slurry is infused outside shield shell, polyurethane is infused to outside shield body, again to injecting dual slurry after the lateral wall of shield tail brush section of jurisdiction, waterglass, above-mentioned construction method can preferably guarantee shield tail water-stagnating effect, ensure exchanging shield ventral brush operation safety.Then the replacement for checking water-stagnating effect, removing completion shield tail brush after a last assembled endless tube piece.Rich water sandy silt soil stratum exchanging shield ventral brush construction method provided by the invention can preferably guarantee sealing when exchanging shield ventral brush, stop sand effect, effectively improve safety when exchanging shield ventral brush operation.
Description
Technical field
The invention belongs to Shield Construction Technique fields, and in particular to one kind acts on shield in rich water sandy silt soil stratum shield-tunneling construction
The method of ventral brush replacement.
Background technique
Shield, often due to shield tail brush excessive wear, causes it to gradually lose leakproofness during set of tunneling construction,
Shield tail spillage leak is caused, in case of this situation need to shut down replacement shield tail brush.When rich water sandy silt soil stratum replaces shield tail brush, because of stratum
Water content is big, and stratum inner powder sand mobility is big, there are shield tails to gush blowout water, section of jurisdiction change built on the sand, in replacement ventral brush construction for geology
The risks such as shape and ground collapsing.
Most directly effective method is to excavate inspection-pit, but because time-consuming, capital investment is big for it, cause live practical at present
The overwhelming majority is to be reinforced to shield tail position, carry out exchanging shield ventral brush after sealing again by the way of in construction, it is seen that reinforce,
The quality of water-stagnating effect directly determines the safety of shield brush brush replacement operation.
Summary of the invention
In order to solve rich water sandy silt soil stratum exchanging shield ventral brush construction in the prior art shield tail position stream easily occurs for the present invention
Water gushes the problem of safety accidents such as sand, provides a kind of side for acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction
Shield tail safety when shield tail replacement shield tail brush can be effectively ensured using this method, ensure that exchanging shield ventral brush construction safety for method.
The present invention is achieved through the following technical solutions: one kind acting on shield tail brush in rich water sandy silt soil stratum shield-tunneling construction
The method of replacement, includes the following steps:
S1. shield machine stop position is determined before the exchanging shield ventral brush, the selection of stop position must avoid all kinds of buried pipelines
Security protection distance；
S2. the stroke of shield machine thrust oil cylinder is calculated, the determination of propelling cylinder stroke can be calculated according to formula a=H+c-h+b,
Wherein, a is oil cylinder stroke to be determined, and H is distance of the notch to second ventral brush welding position, and h is under the full reduced state of oil cylinder
Notch to oil cylinder supports boots distance, and b is section of jurisdiction width, and c is the hinged stroke of active；
S3. the fermented backward injection Tu Cang of bentonite displaces dregs in native storehouse, and Tu Cang injects bentonite, is to utilize shield
Machine carries extrusion pump and injects bentonite into native storehouse, while screw machine is constantly slagged tap, when screw machine is slagged tap for lasting bentonite
Stop screw machine casting, continues the supreme soil pressure of injection bentonite and keep stopping injection when 1.8bar；
S4. extrusion pump is carried by anterior shield, the radial hole of tail shield circle distribution using shield machine, inject bentonite to outside shield shell,
Until injection pressure keeps stopping when 1.8bar；
S5. polyurethane is injected after the anteposition section of jurisdiction wall of shield tail brush, specifically, by shield machine anterior shield, the radial hole ball valve of tail shield
Be separately connected polyurethane slip casting pump conduit, carry out Polyurethane Perfusion, injection sequence be along section of jurisdiction circumferencial direction from bottom to top, injection
Pressure is no more than 1.8bar, and during polyurethane slip casting, not plugging when to guarantee intermediate replacement slip casting hole location need to be effective to slip casting
The diluents such as solvent or diluent are cleaned；
S6. dual slurry is injected after the section of jurisdiction wall of 5 rings before shield tail brush, dual slurry is the mixed liquor of cement-sodium silicate, slip casting
When in section of jurisdiction slip casting hole site Φ 50mm ball valve is installed, connect 1m long drill pipe using impact drill and get through section of jurisdiction and enter soil layer, ball valve connects
Dual slurry threeway and grouting pipeline, for the control of slurries presetting period in 30~40s, grouting sequence is from bottom to top, per adjacent two ring
The injection of quincuncial pile shape, grouting pressure are no more than 4bar；
S7. the water-stagnating effect inspection of shield tail, the 3 ring slip casting hole site impact drill aperture specifically before shield tail are carried out, if checking
Injected hole do not occur flowing water, quicksand, it is believed that water-stagnating effect is good and carries out subsequent section of jurisdiction dismounting, ventral brush inspection replacement etc. and makees
Industry；Such as find bore position of opening have flowing water, quicksand phenomenon, must continue here inject polyurethane to reach sealing plugging effect,
After aperture has checked, ball valve is closed in time；
S8. after removing K block, after checking that water-stagnating effect is good, subsequent ventral brush replacement is carried out, wherein remove should be according to from upper for section of jurisdiction
Sequence block-by-block under and carries out, and new ventral brush is welded after excluding, clear up by ventral brush behind section of jurisdiction, polishing in one piece of section of jurisdiction of every dismounting again, directly
It is completed to the replacement of whole circle ventral brush；
S9. it is checked after the completion of ventral brush welding, smears grease after confirmation welding quality is qualified and be sealed.
The specified features and beneficial effect that the present invention has compared with prior art are:
Rich water sandy silt soil stratum exchanging shield ventral brush construction method provided by the invention can preferably guarantee stopping when exchanging shield ventral brush
Water, only sand effect, effectively improve safety when exchanging shield ventral brush operation.
Detailed description of the invention
Fig. 1 is construction process schematic diagram of the invention.
Specific embodiment
Invention is further elaborated referring to Fig.1, the present invention provides a kind of rich water sandy silt soil stratum exchanging shield ventral brush construction
Method is used for constructing tunnel, and wherein shield stop position, propelling cylinder stroke determine, need to select suitable position, avoid ground as far as possible
Face building, all kinds of buried pipelines, and calculate propelling cylinder stroke, it is ensured that the ventral brush to be replaced can be exposed after removing section of jurisdiction,
One of ventral brush after not exposing.
Wherein, the bentonite injected to shield machine Tu Cang, shield shell is to inject bentonite in native storehouse to replace slag in storehouse of being unearthed
Soil.Rotating cutter-head is needed during native storehouse bentonite displacement dregs, bentonite slurry can form more complete mud film in face.
Simultaneously during bentonite injects Tu Cang, the top spacer ball valve in people storehouse is opened, and is played scavenging action, be should be noted after exhaust
Half section need to block ball valve with woven bag, and the biggish bentonite slurry injection of pressure is avoided to hurt sb.'s feelings.
Shield shell infuses bentonite, is that extrusion pump is carried using shield machine by anterior shield, the radial hole of tail shield circle distribution, to shield
Bentonite is injected outside shell, until injection pressure keeps stopping when 1.8bar.Fully wrapped around by bentonite around shield body, slurries are fled
Channel is tentatively separated.Shield shell note bentonite can effectively block shield body surrounding formations flowing water or reduce its flowing velocity, ensure
The polyurethane of subsequent shield shell injection reaches preferable water-stagnating effect around shield body, while being also prevented from cement slurry after shield tail rear wall
Liquid wraps shield body.
Shield shell infuses polyurethane, comprising: polyurethane grouting pump piping connection to anterior shield, tail shield radial hole ball valve carry out poly- ammonia
Ester injection.Injection sequence be along section of jurisdiction circumferencial direction from bottom to top, injection pressure be no more than 1.8bar.Polyurethane slip casting process
In, not plugging when to guarantee intermediate replacement slip casting hole location need to clean the diluents such as the effective solvent or diluent of slip casting.
Shield tail infuse polyurethane, concrete operation method are as follows: shield tail polyurethane injection phase be last one of the seal chamber of shield tail it
Preceding 3 ring；Shield tail polyurethane injection before need to section of jurisdiction injected hole install Φ 50mm ball valve, impact drill connect 1m long drill pipe get through section of jurisdiction into
Underground layer connects polyurethane Grouting Pipe, injects polyurethane, injection pressure 3bar.Injection sequence be along section of jurisdiction circumferencial direction from
On down, polyurethane injection process is continuous, and injection rate is uniform.Replace slip casting point and slip casting cleaning management in time and note after the completion
Pulp grinder；In shield tail polyurethane injection process, to guarantee that polyurethane does not invade tail sealing chamber, need simultaneous pumping shield tail oily
Polyurethane is squeezed out seal chamber by rouge, and sealing is formed outside grease seal chamber.
The slip casting that shield tail is infused is cement-sodium silicate double liquid, infuses dual slurry after 5 endless tube piece walls before shield tail brush.Section of jurisdiction note
It starches hole and Φ 50mm ball valve is installed, impact drill, which connects 1m long drill pipe, to be got through section of jurisdiction and enter soil layer, and ball valve connects dual slurry threeway and Grouting Pipe
Road, cementing-waterglass dual slurry after the wall of section of jurisdiction.Slip casting scene carries out dual slurry proportioning test, and the control of slurries presetting period exists
30~40s.Grouting sequence is from bottom to top, to inject per adjacent two rings quincuncial pile shape, and grouting pressure is no more than 4bar.Replacement note
Starch point and slip casting cleaning management in time and slip casting machine after the completion.To prevent synchronous grouting pipeline and shield tail grease lines by slurries
Blocking, need to pump at regular intervals bentonite and shield tail grease during the slip casting of shield tail position.
Further, shield tail water-stagnating effect inspection is the 3 ring injected hole impact drill aperture before shield tail, checks sealing effect
Fruit.If the injected hole checked does not occur flowing water, quicksand, the operations such as subsequent section of jurisdiction dismounting, ventral brush inspection replacement can be carried out；Such as discovery
Respective location flowing water, quicksand need to continue slip casting in corresponding position, note polyurethane carries out the strong rear re-inspection sealing effect such as sealing closure
Fruit.After aperture has checked, ball valve is closed in time.
It replaces shield tail brush and carries out subsequent ventral brush replacement, further includes: from top to bottom after dismounting K block checks that water-stagnating effect is good
Block-by-block removes section of jurisdiction, ventral brush behind section of jurisdiction excluded, cleared up by one piece of section of jurisdiction of every dismountings, polish after weld new ventral brush, up to whole circle tail
Brush replacement is completed；
Lack propulsive thrust for shield body during preventing ventral brush from replacing and fall back, fashioned iron need to be added after shield body, effect is by section of jurisdiction
Propulsive thrust passes to propelling cylinder；It is checked after the completion of ventral brush welding, smears hand grease after qualified.
Further, the domain pipe sheet assembling of dismounting is returned into original position.Propelling cylinder stroke determines, is in exchanging shield ventral brush
It is preceding that shield stop position and ventral brush exposed uncovered positions are compared through drawing, obtained after calculating.The Tu Cang, shield shell infuse bentonite, in advance
After mixing fermentation bentonite, extrusion pump is carried using shield machine and injects bentonite to Tu Cang, replace dregs in storehouse of being unearthed, prevent because of slurry
Situations such as cutterhead caused by altering before liquid is stuck, foam hole plug；Extrusion pump is infused by anterior shield, tail shield radial grouting hole to outside shield shell
Enter bentonite, prevents cement grout after shield tail rear wall from wrapping shield body.It is described to inject polyurethane to anterior shield, tail shield, it is to pass through
Anterior shield, tail shield bentonite filling line, polyurethane grouting pump piping connection to radial hole ball valve carry out polyurethane injection, block
Shield body periphery flowing water.The shield tail infuses polyurethane, and 3 rings before polyurethane injection phase is last one of the seal chamber of shield tail utilize
Section of jurisdiction injected hole connects polyurethane Grouting Pipe, injects polyurethane, blocks shield tail rear portion water, and in shield tail cement injection to shield
Tail sealing brush plays a protective role.The shield tail infuses dual slurry, is to infuse dual slurry, i.e. section of jurisdiction after 5 endless tube piece walls before shield tail brush
Injected hole mounting ball valve, impact drill extension drill rod get through section of jurisdiction and enter soil layer, and ball valve connects dual slurry threeway and grouting pipeline, section of jurisdiction
Cementing-waterglass dual slurry after wall reinforces the shield tail position soil body, further blocks shield tail rear water.The shield tail sealing
Effect inspection, i.e., the 3 ring injected hole impact drill aperture before shield tail check water-stagnating effect.The ventral brush replacement operation, is most
After latter endless tube piece block-by-block removes confirmation safety, first of ventral brush is excluded, dregs cleaning, polishing, the welding of new ventral brush, is applied
It puts the oil the work of rouge and segment assembly.
Wherein, propelling cylinder stroke determines, need to select suitable position, comprising: shield stop position is avoided ground as far as possible and built
Object, all kinds of buried pipelines are built, and propelling cylinder stroke is calculated according to ventral brush position to be replaced, it is ensured that can be exposed after removing section of jurisdiction
The ventral brush to be replaced, one of ventral brush after not exposing.
Rich water sandy silt soil stratum exchanging shield ventral brush construction method provided by the invention, first calculating shield stop position and propulsion
Then oil cylinder stroke infuses bentonite slurry outside Xiang Tucang, shield shell, infuse polyurethane to outside shield body, then to shield tail brush section of jurisdiction lateral wall
Dual slurry, waterglass are injected afterwards, and above-mentioned construction method can preferably guarantee shield tail water-stagnating effect, it is ensured that exchanging shield ventral brush operation
Safety.Then the replacement for checking water-stagnating effect, removing completion shield tail brush after a last assembled endless tube piece.
Claims (1)
1. a kind of method for acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction, which is characterized in that including walking as follows
It is rapid:
S1. shield machine stop position is determined before the exchanging shield ventral brush, the selection of stop position must avoid all kinds of buried pipelines
Security protection distance；
S2. the stroke of shield machine thrust oil cylinder is calculated, the determination of propelling cylinder stroke can be calculated according to formula a=H+c-h+b,
Wherein, a is oil cylinder stroke to be determined, and H is distance of the notch to second ventral brush welding position, and h is under the full reduced state of oil cylinder
Notch to oil cylinder supports boots distance, and b is section of jurisdiction width, and c is the hinged stroke of active；
S3. the fermented backward injection Tu Cang of bentonite displaces dregs in native storehouse, and Tu Cang injects bentonite, is to utilize shield
Machine carries extrusion pump and injects bentonite into native storehouse, while screw machine is constantly slagged tap, when screw machine is slagged tap for lasting bentonite
Stop screw machine casting, continues the supreme soil pressure of injection bentonite and keep stopping injection when 1.8bar；
S4. extrusion pump is carried by anterior shield, the radial hole of tail shield circle distribution using shield machine, inject bentonite to outside shield shell,
Until injection pressure keeps stopping when 1.8bar；
S5. polyurethane is injected after the anteposition section of jurisdiction wall of shield tail brush, specifically, by shield machine anterior shield, the radial hole ball valve of tail shield
Be separately connected polyurethane slip casting pump conduit, carry out Polyurethane Perfusion, injection sequence be along section of jurisdiction circumferencial direction from bottom to top, injection
Pressure is no more than 1.8bar, and during polyurethane slip casting, not plugging when to guarantee intermediate replacement slip casting hole location need to be effective to slip casting
The diluents such as solvent or diluent are cleaned；
S6. dual slurry is injected after the section of jurisdiction wall of 5 rings before shield tail brush, dual slurry is the mixed liquor of cement-sodium silicate, slip casting
When in section of jurisdiction slip casting hole site Φ 50mm ball valve is installed, connect 1m long drill pipe using impact drill and get through section of jurisdiction and enter soil layer, ball valve connects
Dual slurry threeway and grouting pipeline, for the control of slurries presetting period in 30~40s, grouting sequence is from bottom to top, per adjacent two ring
The injection of quincuncial pile shape, grouting pressure are no more than 4bar；
S7. the water-stagnating effect inspection of shield tail, the 3 ring slip casting hole site impact drill aperture specifically before shield tail are carried out, if checking
Injected hole do not occur flowing water, quicksand, it is believed that water-stagnating effect is good and carries out subsequent section of jurisdiction dismounting, ventral brush inspection replacement etc. and makees
Industry；Such as find bore position of opening have flowing water, quicksand phenomenon, must continue here inject polyurethane to reach sealing plugging effect,
After aperture has checked, ball valve is closed in time；
S8. after removing K block, after checking that water-stagnating effect is good, subsequent ventral brush replacement is carried out, wherein remove should be according to from upper for section of jurisdiction
Sequence block-by-block under and carries out, and new ventral brush is welded after excluding, clear up by ventral brush behind section of jurisdiction, polishing in one piece of section of jurisdiction of every dismounting again, directly
It is completed to the replacement of whole circle ventral brush；
S9. it is checked after the completion of ventral brush welding, smears grease after confirmation welding quality is qualified and be sealed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910409898.0A CN110067565A (en) | 2019-05-16 | 2019-05-16 | A method of acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910409898.0A CN110067565A (en) | 2019-05-16 | 2019-05-16 | A method of acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction |
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| Publication Number | Publication Date |
|---|---|
| CN110067565A true CN110067565A (en) | 2019-07-30 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910409898.0A Pending CN110067565A (en) | 2019-05-16 | 2019-05-16 | A method of acting on exchanging shield ventral brush in rich water sandy silt soil stratum shield-tunneling construction |
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| CN (1) | CN110067565A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939450A (en) * | 2019-11-27 | 2020-03-31 | 中建五局土木工程有限公司 | Shield excavation grouting structure for water-rich disturbance sensitive stratum and construction method |
| CN111946358A (en) * | 2020-07-22 | 2020-11-17 | 中交第二航务工程局有限公司 | Correction tool for treating shield tail deformation in water-rich sand layer and construction process of correction tool |
| CN111963182A (en) * | 2020-06-01 | 2020-11-20 | 中建八局轨道交通建设有限公司 | Construction method for replacing tail brush of shield tunneling machine |
| CN111997633A (en) * | 2020-07-23 | 2020-11-27 | 山东大学 | Construction method for replacing shield tail sealing brush of shield tunneling machine |
| CN112228087A (en) * | 2020-10-12 | 2021-01-15 | 中铁四局集团第二工程有限公司 | Method for increasing and replacing shield tail brush of shield tunneling machine |
| CN112523763A (en) * | 2020-12-01 | 2021-03-19 | 中铁十二局集团有限公司 | Long-time shutdown construction method for water-rich sand layer shield |
| CN112879018A (en) * | 2021-01-27 | 2021-06-01 | 中铁十二局集团有限公司 | Shield construction method for water-rich silt stratum |
| CN114508358A (en) * | 2022-01-04 | 2022-05-17 | 中交(南京)建设有限公司 | Shield tail brush replacement construction method for water-rich weak sensitive stratum |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110939450A (en) * | 2019-11-27 | 2020-03-31 | 中建五局土木工程有限公司 | Shield excavation grouting structure for water-rich disturbance sensitive stratum and construction method |
| CN111963182A (en) * | 2020-06-01 | 2020-11-20 | 中建八局轨道交通建设有限公司 | Construction method for replacing tail brush of shield tunneling machine |
| CN111963182B (en) * | 2020-06-01 | 2022-07-01 | 中建八局轨道交通建设有限公司 | Construction method for replacing tail brush of shield tunneling machine |
| CN111946358A (en) * | 2020-07-22 | 2020-11-17 | 中交第二航务工程局有限公司 | Correction tool for treating shield tail deformation in water-rich sand layer and construction process of correction tool |
| CN111946358B (en) * | 2020-07-22 | 2022-05-24 | 中交第二航务工程局有限公司 | Correction tool for treating shield tail deformation in water-rich sand layer and construction process of correction tool |
| CN111997633A (en) * | 2020-07-23 | 2020-11-27 | 山东大学 | Construction method for replacing shield tail sealing brush of shield tunneling machine |
| CN112228087A (en) * | 2020-10-12 | 2021-01-15 | 中铁四局集团第二工程有限公司 | Method for increasing and replacing shield tail brush of shield tunneling machine |
| CN112523763A (en) * | 2020-12-01 | 2021-03-19 | 中铁十二局集团有限公司 | Long-time shutdown construction method for water-rich sand layer shield |
| CN112879018A (en) * | 2021-01-27 | 2021-06-01 | 中铁十二局集团有限公司 | Shield construction method for water-rich silt stratum |
| CN114508358A (en) * | 2022-01-04 | 2022-05-17 | 中交(南京)建设有限公司 | Shield tail brush replacement construction method for water-rich weak sensitive stratum |
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