CN107676105B - Grouting anti-blocking component of shield tunneling machine - Google Patents
Grouting anti-blocking component of shield tunneling machine Download PDFInfo
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- CN107676105B CN107676105B CN201610624025.8A CN201610624025A CN107676105B CN 107676105 B CN107676105 B CN 107676105B CN 201610624025 A CN201610624025 A CN 201610624025A CN 107676105 B CN107676105 B CN 107676105B
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- grouting
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- blocking component
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- 230000005641 tunneling Effects 0.000 title claims description 12
- 239000007788 liquid Substances 0.000 claims abstract description 54
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011440 grout Substances 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005406 washing Methods 0.000 abstract description 3
- 239000003637 basic solution Substances 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- 230000006978 adaptation Effects 0.000 abstract 2
- 238000007569 slipcasting Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000002689 soil Substances 0.000 description 9
- 235000019353 potassium silicate Nutrition 0.000 description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK 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
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a grouting anti-blocking component of a shield machine, which comprises a grouting head and a grouting piston moving back and forth in the grouting head, wherein the grouting head is respectively connected with two liquid injection pipelines, a pore passage is formed in the grouting piston, the front end of the grouting piston and the inner wall of the grouting head form a mixed cavity, the mixed cavity is communicated with one liquid injection pipeline, and the other liquid injection pipeline is communicated with the pore passage formed in the grouting piston. Compared with the prior art, the grouting device has the advantages of simple structure, small occupied space, higher economy and reliability, adaptation to the self properties of different grout, adaptation to the proportioning change of the grout, improvement of grouting efficiency and grouting effect, washing water saving, avoidance of grout waste and basic solution of grouting blockage.
Description
Technical Field
The invention relates to the field of grouting construction by a shield method, in particular to a grouting anti-blocking component of a shield machine.
Background
In the shield tunneling process, synchronous grouting is carried out synchronously with tunneling, and a proper amount of grouting material is filled to densely fill the gap (namely the gap between the segment lining separated from the shield tail and the building gap between the segments and the soil body) of the shield tail in a very short time, so that the surrounding rock and soil body is supported timely, the collapse of the soil body is effectively prevented, the settlement of the earth surface is controlled, the position of the segment is fixed, the water accumulated on the back of the segment is prevented, and the shield tunneling machine is ensured not to deform and leak water after tunneling.
The stability and effectiveness of the synchronous grouting system are one of the key factors for ensuring the safety and quality of engineering when the synchronous grouting system passes through the railway, the existing buildings in the city, the airport runway and other working conditions which have severe requirements on ground settlement.
In the existing shield equipment, a synchronous grouting system mainly adopts two kinds of equipment, namely double-liquid grouting and single-liquid grouting. Compared with the synchronous grouting of two systems, the single-fluid grouting method has the advantages that the grout solidification speed is low, the grout solidification speed is difficult to control, the grouting diffusion range is difficult to control, pressure grout is easy to diffuse disorderly, the grout is wasted, and the filling and reinforcing effects are seriously influenced; the double-liquid grouting method can adjust the setting time of grout, but because the double-liquid grout is generally injected into a stratum after being mixed in a grouting pipe mixing cavity, the grouting property and the setting time of the grout are poor, the pipe blockage phenomenon is easy to occur, the grouting cannot be performed, the grouting construction efficiency is influenced, the grouting quality is influenced even if the double-liquid grout is not timely treated, and further the safety and the progress of engineering are influenced.
Therefore, although the grouting quality is convenient to control and the grouting effect is good, the part of the grouting mixing cavity is easy to block, even if the grouting mixing cavity is cleaned frequently, part of sand grains in the slurry are deposited in the slurry pipe, the drift diameter of the slurry pipe is gradually reduced, the blockage can be caused, and a large amount of clear water or bentonite is consumed for cleaning once, so that the problem of sewage discharge in the tunnel is also caused. In the actual work progress, operating personnel often do not pay attention to the clearance and the washing of pipeline, in case stop pushing for a long time, dredge in the clearance again, then grouting system must block up, bring the hidden danger for the follow-up quality of advancing work of shield structure.
The filling and mixing method of the double-liquid grouting system adopted by shield manufacturers at home and abroad at the present stage mainly comprises two methods: a, B liquid is respectively provided with a pipeline which is independently led to the soil body, and is freely mixed in the soil body after being respectively filled into the soil body; the other is well mixed and injected into the gap of the shield tail in a pipeline (a section of mixing cavity) in the shield shell.
The slurry adopting the first mode has poor mixing effect, and the slurry solidification time has a large fluctuation range, so the grouting quality is unstable; the second mode slurry is mixed effectually, and the thick liquid setting time is stable controllable, and slip casting stable quality, nevertheless because the hybrid chamber is in the shield shell, one-way rubber sleeve is adopted to B liquid pipe end, but because B liquid pipe export encloses in A liquid pipeline basically, B liquid flow is to unstable, and the space is narrower, in case slip casting pause or discontinuity, it is not enough to dredge to wash or wash, and the pipeline produces the jam easily. Once the blockage occurs, it takes a lot of time to dismantle and dredge the pipeline, and there is a certain risk of gushing under the condition of high external pressure.
At the present stage, manufacturers do not have perfect solutions to the problems of grouting pipeline blockage and blockage removal, some manufacturers optimize the section shape of the grouting pipeline, some manufacturers adopt grouting guns with cleaning loops, and in actual use, the blockage and blockage removal conditions of the grouting pipeline are still a great stubborn problem in the construction process.
Chinese patent CN 103982198A discloses a shield constructs two liquid thick liquids slip casting and connects, and its internal thread three-way pipe passes through outer joint i and connects the cavity three-way pipe, and cavity three-way pipe right side is connected with the section of jurisdiction connector, and cavity three-way pipe top is equipped with outer joint ii, is equipped with the check valve that is used for controlling the injected water glass interface on the outer joint ii, and the water glass pipe is connected with the check valve, injects water glass in to the section of jurisdiction connector through the cavity three-way pipe. However, when grouting is stopped in the patent application, external grout and sundries can invade the segment connector and the hollow three-way pipe, and if the ball valve is in an open state, the external grout and the sundries can also invade the whole cement slurry pipeline, which is also a problem frequently encountered at present. And the water glass pipeline is in the pipeline range of the cement paste/mixing area when the water glass pipeline is not grouted, and if the water glass passing through the one-way valve has residues, the water glass can be blocked in the mixing area.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a grouting anti-blocking component of a shield machine, which solves the problems that a double-liquid grouting system is easy to block pipes, and the grouting quality is influenced due to poor slurry mixing quality, reduces the slurry loss and enhances the adaptability of shield equipment to various complex stratums.
The purpose of the invention can be realized by the following technical scheme:
a grouting anti-blocking component of a shield machine comprises a grouting head and a grouting piston moving back and forth in the grouting head,
the grouting head is respectively connected with two liquid injection pipelines,
the grouting piston is internally provided with a pore passage, the front end of the grouting piston and the inner wall of the grouting head form a mixing cavity, the volume of the mixing cavity can be changed along with the movement of the piston, the mixing cavity is communicated with one liquid injection pipeline, and the other liquid injection pipeline is communicated with the pore passage arranged in the grouting piston. The piston has a good blockage removing function in the extending process from the grouting to the grouting stop. This is an effect that the conventional inventions have not. The piston is connected with a piston rod of an oil cylinder, has larger thrust and can completely push the solidified or semi-solidified substance out of a grouting head pipeline.
The grouting piston is characterized in that a fixed guide rod is arranged in the grouting head, the grouting piston has the functions of preventing large sundries from invading and blocking the grouting head, the center of the grouting piston is provided with an opening matched with the guide rod, a small amount of residual grout in the inner hole of the piston head is extruded along with the extension of the piston head, and a space for mixing grout is not reserved.
The fixed guide rod is fixedly connected with the inner wall of the grouting head in a cross-shaped support mode, and the cross-shaped support rod at the outlet of the grouting head can block large sundries and reduce the possibility of blockage.
The end part of the grouting piston is in a four-petal inverted conical surface form and is overlapped with a cross rod of a cross brace of the fixed guide rod, so that no gap is basically left in a piston head mixing area, residual grout or semi-full concretion in the grouting head can be shoveled out of an inner hole of the piston head, and due to the fact that the mixing area is short, the thrust of the oil cylinder is enough to crush the grout concretion.
The hole channel arranged in the grouting piston is an axial hole arranged along the axial direction of the grouting piston and a plurality of radial holes communicated with the axial hole.
The axial hole is communicated with an opening at the center of the grouting piston and matched with the guide rod.
The front end of the grouting piston is provided with a one-way sealing assembly for preventing the slurry from flowing back into the grouting piston from the mixing cavity.
The rear end of the grouting piston is rich and the rear oil cylinder piston rod is connected.
Compared with the prior art, the invention has the advantages of simple structure, small occupied space, higher economy and reliability, adaptability to the self properties of different grout, adaptability to the proportioning change of the grout, improvement of grouting efficiency and grouting effect, washing water saving, grout waste avoidance, basic solution of grouting blockage problem, reduction of the downtime of the shield machine, and effective reduction of the tunneling construction cost and the maintenance cost of the shield machine.
Drawings
FIG. 1 is a schematic diagram of the present invention performing a two-fluid grouting operation;
FIG. 2 is a schematic diagram of the single-fluid grouting operation of the present invention;
FIG. 3 is a schematic structural diagram of the present invention when grouting is stopped;
FIG. 4 is a partial schematic structural view of a grouting head;
fig. 5 is a partial structural schematic diagram of a grouting piston.
In the figure, 1 is a grouting head, 2 is a grouting piston, 3 is a grouting head guide rod, 4 is a liquid A pipeline, 5 is a liquid B pipeline, 6 is a piston radial hole, 7 is a mixing area, and 8 is a piston axial hole.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
A grouting anti-blocking component of a shield machine is structurally shown in figures 1-3 and mainly comprises a grouting head 1, a grouting piston 2, a liquid A pipeline 4 and a liquid B pipeline 5. Wherein the grouting head guide rod 3 is fixedly connected with the inner wall of the grouting head 1 through a cross-shaped support rod, as shown in figure 4, and is matched with the piston axial hole 8; the grouting piston 2 is arranged in the grouting head 1, the rear end of the grouting piston 2 is connected with an oil cylinder piston rod, and piston movement can be performed in the grouting head 1, so that the volume of the mixing area 7 is changed; the inner part of the grouting head 1 close to the outlet end is used as a mixing area 7, one side of the mixing area 7 is communicated with the liquid A pipeline 4, the rear end of the mixing area is communicated with a piston axial hole 8 of the grouting piston 2, and liquid A injected by the liquid A pipeline 4 and liquid B injected by the piston axial hole 8 are mixed in the mixing area 7 and then injected into soil. When the grouting operation is stopped, the grouting piston 2 is extended until the volume of the mixing zone 7 becomes 0.
The structure of the grouting piston 2 is shown in fig. 5, a plurality of piston radial holes 6 are formed in the grouting piston 2, during grouting operation, the grouting piston 2 retracts, the piston radial holes 6 are communicated with the liquid B pipeline 5, and meanwhile, the piston radial holes 6 are communicated with the piston axial hole 8. When stopping slip casting operation, slip casting piston 2 stretches out, and piston radial hole 6 is isolated with B liquid pipeline 5. The periphery of the grouting piston 2 and the inner wall of the axial hole of the piston are provided with seals which can respectively prevent the grout from invading into the rear mechanism and the B liquid pipeline 5.
4 inverted conical surface bodies at the front end of the grouting piston 2 are matched with a cross brace rod at the outlet end of the grouting head, so that semi-solidified objects and full-solidified objects in a mixing zone can be extruded and crushed, and residues in the range of the mixing zone can be completely extruded.
The working process of the anti-blocking grouting device comprises the following steps:
the normal double-liquid grouting operation schematic diagram is shown in fig. 1, a grouting piston 2 retracts into a grouting head, the stroke is completed, at the moment, a liquid pipeline A4 is communicated with a mixing area 7, a liquid pipeline B5 is communicated with a piston radial hole 6 on the piston 2, the piston radial hole 6 is communicated with a piston axial hole 8, the liquid pipeline B5 is communicated with the mixing area 7, therefore, the proportioning mixing and filling of A, B liquid can be simultaneously carried out, and A, B liquid is mixed in the mixing area 7 and then is injected into soil from the outlet of the grouting head 1.
Normal single liquid slip casting working diagram is shown in fig. 2, inside slip casting piston 2 contracted to the slip casting head, after the specific stroke, this moment A liquid pipeline 4 and mixed area 7 intercommunication, B liquid pipeline 5 and the piston radial hole 6 on the piston 2 isolated, so B liquid pipeline 5 and mixed area 7 isolated, when consequently carrying out A liquid filling, B liquid and A liquid pipeline mutually noninterfere, A liquid is through mixing area 7 back from slip casting head 1 export injection soil body.
The slip casting stopping operation is schematically shown in fig. 3, the slip casting piston 2 extends to the end face of the slip casting head, the stroke is the maximum, the volume of the mixing area 7 is 0, the A, B liquid pipelines are isolated from the outside in the sealing range, and the A, B liquid pipelines are isolated from each other, so that the situation of mutual invasion cannot occur. Meanwhile, in the process of extending the piston 2, the original residual slurry in the mixing area 7 and semi-full concretions are extruded out of the grouting head 1 by the piston 2, so that the mixing area and the A, B liquid pipeline are prevented from being blocked.
Through the piston stretching and retracting action, the above 3 working conditions can be met, and the device has the function of preventing blockage.
At present, double-liquid grouting is limited by a mixing type and an equipment space, only a narrow space in a shield tail shell can be utilized, the problems of poor mixing effect or pipeline blockage exist, and the grouting problems easily cause engineering defects and disasters such as easy liquefaction of a grouting layer, large bleeding property, no shock resistance, low bearing capacity, large ground settlement amount in the later period and the like.
The project basically solves the problems that the pipe is easy to block in the double-liquid grouting system, the grouting quality is influenced due to poor slurry mixing quality, the slurry loss is reduced, the adaptability of the shield equipment to various complex stratums is enhanced, the operation and maintenance work of the grouting system is simplified, and the construction time and the related cost are saved.
Claims (6)
1. A grouting anti-blocking component of a shield machine is characterized by comprising a grouting head and a grouting piston moving back and forth in the grouting head,
the grouting head is respectively connected with two liquid injection pipelines,
a pore channel is formed in the grouting piston, a mixed cavity is formed by the front end of the grouting piston and the inner wall of the grouting head, the mixed cavity is communicated with one liquid injection pipeline, and the other liquid injection pipeline is communicated with the pore channel formed in the grouting piston;
the grouting head is internally provided with a fixed guide rod, the center of the grouting piston is provided with an opening matched with the guide rod, and the fixed guide rod is fixedly connected with the inner wall of the grouting head in a cross-shaped support mode.
2. The grouting anti-blocking component of the shield tunneling machine as claimed in claim 1, wherein the end of the grouting piston is in the form of a four-lobe inverted conical surface and is overlapped with the cross bar of the cross brace of the fixed guide rod.
3. The grouting anti-blocking component of the shield tunneling machine as claimed in claim 1, wherein the hole formed in the grouting piston is an axial hole formed along the axial direction of the grouting piston and a plurality of radial holes communicated with the axial hole.
4. The grouting anti-blocking component of the shield tunneling machine as claimed in claim 3, wherein the axial hole is communicated with an opening at the center of the grouting piston and matched with the guide rod.
5. The grouting anti-blocking component of the shield tunneling machine as claimed in claim 3, wherein a one-way sealing assembly for preventing the slurry from flowing back into the grouting piston from the mixing cavity is arranged at the front end of the grouting piston.
6. The grouting anti-blocking component of the shield tunneling machine according to claim 1, wherein the rear end of the grouting piston is connected with a rear cylinder piston rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610624025.8A CN107676105B (en) | 2016-08-02 | 2016-08-02 | Grouting anti-blocking component of shield tunneling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610624025.8A CN107676105B (en) | 2016-08-02 | 2016-08-02 | Grouting anti-blocking component of shield tunneling machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107676105A CN107676105A (en) | 2018-02-09 |
| CN107676105B true CN107676105B (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610624025.8A Active CN107676105B (en) | 2016-08-02 | 2016-08-02 | Grouting anti-blocking component of shield tunneling machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112922562B (en) * | 2021-03-12 | 2022-11-25 | 河南理工大学 | Multifunctional gas extraction hole sealing method |
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|---|---|---|---|---|
| CN201214788Y (en) * | 2008-06-11 | 2009-04-01 | 成都现代万通锚固技术有限公司 | Grouting device under pressure for mortar anchor rod |
| CN101476469A (en) * | 2009-01-06 | 2009-07-08 | 上海隧道工程股份有限公司 | Dual-fluid synchronous slip casting and cleaning switching mechanism |
| CN201560766U (en) * | 2010-02-26 | 2010-08-25 | 海瑞克(广州)隧道设备有限公司 | Shield rear double-liquid grouting system for shield machine |
| CN102635117A (en) * | 2011-02-11 | 2012-08-15 | 上海申通地铁集团有限公司 | On-off type grouting front end device |
| CN102926760A (en) * | 2012-11-16 | 2013-02-13 | 上海市机械施工有限公司 | Grouting device and application method thereof |
| CN103835730A (en) * | 2014-03-10 | 2014-06-04 | 上海盾构设计试验研究中心有限公司 | Circular section synchronous rotary jet grouting device |
| CN203669882U (en) * | 2013-10-15 | 2014-06-25 | 中铁工程装备集团有限公司 | Shield tail synchronous embedding type double liquid slip casting device of shield tunneling machine |
| CN103982198A (en) * | 2014-04-24 | 2014-08-13 | 中铁四局集团第二工程有限公司 | Shield tunneling double-grout grouting joint |
| CN104533438A (en) * | 2014-12-29 | 2015-04-22 | 上海市基础工程集团有限公司 | One-way valve type nozzle for shield machine slurry supply and water supply system |
| CN205895264U (en) * | 2016-08-02 | 2017-01-18 | 上海力行工程技术发展有限公司 | Shield constructs quick -witted slip casting and prevents stifled component |
-
2016
- 2016-08-02 CN CN201610624025.8A patent/CN107676105B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201214788Y (en) * | 2008-06-11 | 2009-04-01 | 成都现代万通锚固技术有限公司 | Grouting device under pressure for mortar anchor rod |
| CN101476469A (en) * | 2009-01-06 | 2009-07-08 | 上海隧道工程股份有限公司 | Dual-fluid synchronous slip casting and cleaning switching mechanism |
| CN201560766U (en) * | 2010-02-26 | 2010-08-25 | 海瑞克(广州)隧道设备有限公司 | Shield rear double-liquid grouting system for shield machine |
| CN102635117A (en) * | 2011-02-11 | 2012-08-15 | 上海申通地铁集团有限公司 | On-off type grouting front end device |
| CN102926760A (en) * | 2012-11-16 | 2013-02-13 | 上海市机械施工有限公司 | Grouting device and application method thereof |
| CN203669882U (en) * | 2013-10-15 | 2014-06-25 | 中铁工程装备集团有限公司 | Shield tail synchronous embedding type double liquid slip casting device of shield tunneling machine |
| CN103835730A (en) * | 2014-03-10 | 2014-06-04 | 上海盾构设计试验研究中心有限公司 | Circular section synchronous rotary jet grouting device |
| CN103982198A (en) * | 2014-04-24 | 2014-08-13 | 中铁四局集团第二工程有限公司 | Shield tunneling double-grout grouting joint |
| CN104533438A (en) * | 2014-12-29 | 2015-04-22 | 上海市基础工程集团有限公司 | One-way valve type nozzle for shield machine slurry supply and water supply system |
| CN205895264U (en) * | 2016-08-02 | 2017-01-18 | 上海力行工程技术发展有限公司 | Shield constructs quick -witted slip casting and prevents stifled component |
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| CN107676105A (en) | 2018-02-09 |
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