CN109184750B - Tunnel radial grouting device and method - Google Patents
Tunnel radial grouting device and method Download PDFInfo
- Publication number
- CN109184750B CN109184750B CN201811356836.XA CN201811356836A CN109184750B CN 109184750 B CN109184750 B CN 109184750B CN 201811356836 A CN201811356836 A CN 201811356836A CN 109184750 B CN109184750 B CN 109184750B
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- grouting
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- wall
- ball valve
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 88
- 239000010410 layer Substances 0.000 claims description 20
- 238000007569 slipcasting Methods 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 239000004519 grease Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The radial grouting device for the tunnel comprises a sealing unit and a grouting unit, wherein the sealing unit is fixedly arranged on a concrete lining wall, the grouting unit penetrates through the sealing unit and is arranged in a cavity on the outer side of the concrete lining wall, the grouting unit comprises a head section grouting pipe, a plurality of middle grouting pipes and a tail end grouting pipe which are sequentially connected, a ball valve is arranged at the end part of the tail end grouting pipe, the ball valve is communicated with a grouting hose, and the end part of the tail end grouting pipe is exposed out of the inner side of the concrete lining wall; the device and the method have the advantages of reasonable design, simple structure, low cost, convenient operation, safe and reliable construction and the like, and can be popularized and applied to the field of the outside cavity treatment construction of urban subway tunnel structures or mountain tunnel structures.
Description
Technical Field
The invention belongs to the technical field of tunnel construction equipment or devices, and particularly relates to a grouting reinforcement treatment device and method for a concrete lining wall back cavity of an urban subway tunnel.
Background
In urban subway tunnel construction, because engineering geology and hydrogeology conditions are relatively complex, the cavity existing behind the concrete lining of the shallow buried underground excavated tunnel or the cavity formed by over-digging earth due to overlarge disturbance of stratum during shield tunnel tunneling has great potential safety hazards, and the ground is collapsed if the potential safety hazards are light, so that the ground surface or underground construction structure is safe in severe cases. Particularly, when the surface does not have the treatment condition, the potential safety hazard of the cavity is larger, and in-cavity grouting treatment is required to ensure the safety. Due to the influence of underground water, groundwater filling may exist in the cavity and collapse cavity at the moment, a conventional drilling grouting reinforcement method is adopted in the cavity, the risk of water gushing in the cavity exists, the grouting effect is difficult to ensure, and meanwhile, the difficulty of construction operation is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the radial grouting device and the radial grouting method for the tunnel, which have the advantages of reasonable design, simple structure, low cost and simple operation, and can effectively solve the problem of safe construction in the tunnel when grouting and reinforcing the cavity behind the concrete lining (shield segment) wall of the urban subway tunnel.
The technical scheme adopted for solving the technical problems is as follows: the grouting device comprises a sealing unit and a grouting unit, wherein the sealing unit is fixedly arranged on a concrete lining wall, the grouting unit penetrates through the sealing unit and is arranged in a cavity on the outer side of the concrete lining wall, the grouting unit comprises a head grouting pipe, a plurality of middle grouting pipes and a tail grouting pipe which are sequentially connected, a ball valve is arranged at the end part of the tail grouting pipe, the ball valve is communicated with a grouting hose, and the end part of the tail grouting pipe is exposed on the inner side of the concrete lining wall.
The sealing unit comprises a flange and a sealing gasket, wherein the sealing gasket is arranged between the flange and a concrete lining wall, a circle of concentric bolt holes are formed in the flange, a mounting hole is formed in the center of the flange, a sealing pipe is arranged in the mounting hole, a sealing cap is arranged at one end of the sealing pipe, a reserved groove is formed in one end of the sealing pipe matched with the sealing cap, and a sealing layer in a shape of a rectangle is arranged in the reserved groove.
The several sealing layers of the present invention may be arranged in a single layer or in multiple layers.
The front end of the head section grouting pipe is conical, and the rear end of the head section grouting pipe is flat.
The front end of the middle grouting pipe is provided with a joint guide pipe spigot end, the joint guide pipe spigot end is connected with a joint guide pipe fixed end arranged on the inner wall of the middle grouting pipe into an integrated design, and the rear end of the middle grouting pipe is flat.
The front end of the tail end grouting pipe is provided with a joint guide pipe spigot end, the joint guide pipe spigot end and a joint guide pipe fixed end arranged on the inner wall of the tail end grouting pipe are connected into a whole, and the inner wall of the rear end grouting pipe is provided with a connecting screw thread matched with a ball valve.
The pipe walls of the first section grouting pipe and the middle section grouting pipe are provided with quincuncial grouting holes, and the grouting holes are through holes.
The grouting hole is a stepped hole converging from the outer wall to the inner wall, and is filled with hand-coating shield tail sealing grease.
The invention discloses a grouting method of a tunnel radial grouting device, which comprises the following steps:
S1, drilling and coring at the concrete lining wall position where the well is detected to exist and the grouting area is needed, wherein the coring depth is smaller than the thickness of the structural layer, and a concrete protection layer with the thickness of 3-5 cm is reserved at the bottom of the hole;
S2, mounting an orifice sealing unit: an expansion bolt is adopted to fix the flange at the orifice, and a sealing pipe, a plurality of sealing layers and a sealing cap are installed step by step;
S3, driving the grouting pipe by adopting a drilling machine in a segmented manner, breaking the reserved concrete protection layer by impact by utilizing the pointed cone shape of the front end of the first-segment grouting pipe, driving the subsequent grouting pipe in a segmented manner, and finally completing the installation of the grouting pipe according to the position condition of the grouting hole;
S4, sealing the cap in a re-close manner, and sealing a gap between the sealing layers and the outer wall of the grouting pipe;
S5, installing a ball valve, wherein the ball valve is connected with a grouting hose, and the grouting hose is connected with grouting equipment;
s6, opening a ball valve, and grouting;
s7, after grouting is completed, closing the ball valve, disassembling the grouting hose, detecting and rechecking the filling condition of the wall back cavity by adopting a geological radar, and performing repeated grouting if necessary;
S8, dismantling the ball valve after the slurry is initially set;
S9, removing the orifice sealing unit after the slurry is finally solidified, cutting off the exposed steel pipe, and sealing.
Compared with the prior art, the invention has the following advantages:
1. the grouting pipe is used for effectively preventing the problem of water and mud bursting in the drilling process of the grouting pipe, and the grouting pipe is used for synchronously realizing the grouting filling construction of the cavity behind the concrete lining (duct piece), so that the operation is simple.
2. According to the invention, the grouting sealing pipe is fixed on the inner wall of a tunnel concrete lining (shield segment) by adopting a flange structure, and the sealing water leakage of the pipe hole opening is realized by a flange sealing gasket, the sealing pipe and a plurality of seals which are adaptive to the grouting steel pipe; meanwhile, the reserved grouting holes on the grouting steel pipe are plugged by adopting hand-coated shield tail sealing grease, so that water in the holes is prevented from flowing through the grouting pipe; finally, a ball valve is arranged at the bottom of the tail end grouting pipe, a grouting hose is connected for grouting, and finally, the grouting of the cavity behind the wall back of the tunnel concrete lining (shield segment) is realized.
Drawings
Fig. 1 is a schematic diagram of the structure of an embodiment of the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a cross-sectional view of fig. 2.
Fig. 4 is a schematic illustration of a grouting pipe connection.
FIG. 5 is a schematic view of the structure of the tail end grouting pipe 1-3.
Fig. 6 is a partially exploded schematic view of the sealing unit 2.
Fig. 7 is a schematic view showing the arrangement of the grouting holes b in the pipe wall of the grouting pipe.
In the figure: 1. a grouting unit; 2. a sealing unit; 3. a ball valve; 4. grouting hose; 5. the spigot end of the joint guide pipe; 6. a fixed end of the joint guide pipe; 1-1, a first section of grouting pipe; 1-2, a middle grouting pipe; 1-3, a tail end grouting pipe; 2-1, a flange; 2-2, a sealing gasket; 2-3, sealing the tube; 2-4, a sealing layer in a shape of a table; 2-5, sealing cap; a. bolt holes; b. grouting holes; c. reserving a groove.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to these examples.
Example 1
In fig. 1 to 7, the radial grouting device for the tunnel comprises a sealing unit 2 and a grouting unit 1, wherein the sealing unit 2 is fixedly connected and installed on a concrete lining (duct piece) wall through a flange by adopting a threaded connector, the grouting unit 1 penetrates through the sealing unit 2 to be installed in a cavity outside the concrete lining (duct piece) wall, the grouting unit 1 comprises a first section grouting pipe 1-1, a plurality of middle grouting pipes 1-2 and a tail end grouting pipe 1-3 which are sequentially connected, and the end parts of the tail end grouting pipes 1-3 are exposed out of the inner side of the concrete lining wall. The front end of the first section grouting pipe 1-1 is conical, so that the advancing resistance of the grouting pipe is reduced, the grouting pipe is convenient to install, the rear end of the first section grouting pipe 1-1 is flat, the subsequent pipe section installation and butt joint are facilitated, the front end of the middle section grouting pipe 1-2 of the embodiment is provided with a joint guide pipe spigot end 5, the joint guide pipe spigot end 5 and a joint guide pipe fixed end 6 welded on the inner wall of the middle section grouting pipe 1-2 are integrally designed, the rear end of the middle section grouting pipe 1-2 is flat, and the joint guide pipe is convenient for connection between adjacent grouting pipes; the front end of the tail end grouting pipe 1-3 is provided with a joint guide pipe spigot 5, the joint guide pipe spigot 5 is integrally designed with a joint guide pipe fixed end 6 welded on the inner wall of the tail end grouting pipe 1-3, the joint guide pipe is convenient for connecting the middle grouting pipe 1-2 and the tail end grouting pipe 1-3, the joint guide pipe of the embodiment is processed by adopting a steel pipe with the outer diameter slightly smaller than the inner diameter of the grouting pipe, the length of the joint guide pipe spigot 5 is not smaller than 5cm, the inner wall of the rear end of the tail end grouting pipe 1-3 is processed with a connecting screw thread, the connecting screw thread is matched with the ball valve 3 to fix the ball valve 3 on the end part of the tail end grouting pipe 1-3, ball valve 3 is linked together with slip casting hose 4, and slip casting hose 4 is linked together with grouting equipment, through the opening and shutting of ball valve 3 to the inside slip casting of slip casting pipe, be quincuncial processing on the first section slip casting pipe 1-1 of this embodiment, middle part slip casting pipe 1-2 pipe wall and have grouting hole b, the last grouting hole b of processing on the tail end slip casting pipe 1-3 pipe wall, grouting hole b be from outer wall to the convergent step through-hole of inner wall, the intussuseption of grouting hole b is filled with hand-coating type shield tail sealing grease, prevent muddy water, dregs entering slip casting intraductal in the cavity, the problem of gushing water gushing mud in the prevention slip casting unit installation construction takes place.
The sealing unit of the embodiment comprises a flange 2-1, a sealing gasket 2-2, a sealing tube 2-3, a sealing tube 2-4 in a shape of a rectangle, and a sealing cap 2-5, wherein the sealing gasket 2-2 is arranged between the flange 2-1 and a concrete lining (duct piece) wall, a through hole which is suitable for the outer diameter of a grouting tube is processed at the central position of the sealing gasket 2-2, a circle of concentric bolt holes a are processed on the flange 2-1, a mounting hole is processed at the central position, the flange 2-1 is fixedly arranged on the concrete lining (duct piece) wall which needs grouting construction through bolts arranged in the bolt holes a, the sealing tube 2-3 is arranged in the mounting hole, one end of the sealing tube 2-3 is fixedly connected with the sealing cap 2-5 through a threaded fastening connecting piece, a reserved groove c is processed at one end of the sealing tube 2-3 matched with the sealing cap 2-5, the sealing tube 2-4 in a rectangle is arranged in the reserved groove, and the sealing tube 2-4 in a rectangle can be arranged in a single layer or multiple layers.
The invention discloses a grouting method of a tunnel radial grouting device, which comprises the following steps:
S1, drilling and coring at the position of a concrete lining wall (shield segment) wall where a grouting area is required to be performed in the ascertained cavity, wherein the coring depth is smaller than the thickness of a structural layer, and a concrete protection layer with 3-5 cm is reserved at the bottom of the hole;
s2, mounting an orifice sealing unit 2: an expansion bolt is adopted to fix the flange 2-1 at the orifice, and a sealing pipe 2-3, a sealing layer 2-4 and a sealing cap 2-5 are installed step by step;
S3, driving the grouting pipe by adopting a drilling machine in a segmented manner, using the pointed cone shape of the front end of the first-segment grouting pipe 1-1 to impact and break the reserved concrete protection layer, driving the first-segment grouting pipe 1-1, driving the subsequent grouting pipe in a segmented manner, and finally completing the installation of the grouting pipe according to the position condition of a grouting cavity;
S4, sealing the gap between the sealing layers 2-4 and the outer wall of the grouting pipe in a sealing mode by the re-sealing cap 2-5;
s5, installing a ball valve 3, wherein the ball valve is connected with a grouting hose 4, and the grouting hose 4 is connected with grouting equipment;
s6, opening the ball valve 3 to perform grouting; the grouting slurry can be single-liquid cement slurry or cement-water glass double-liquid slurry or other slurry, and the grouting pressure is determined through calculation and field test;
S7, after grouting is completed, closing the ball valve 3, disassembling the grouting hose 4, detecting and rechecking the filling condition of the wall back cavity by adopting a geological radar, and performing repeated grouting if necessary;
s8, dismantling the ball valve 3 after the slurry is initially set;
s9, removing the orifice sealing unit 2 after the slurry is finally solidified, cutting the exposed steel pipe, and sealing.
Claims (5)
1. The utility model provides a radial grouting device in tunnel, includes sealing unit and slip casting unit, sealing unit fixed set up on concrete lining wall, slip casting unit pierces through sealing unit and sets up in concrete lining wall outside cavity, slip casting unit including head section slip casting pipe, a plurality of middle part slip casting pipe, the tail end slip casting pipe that connect gradually, tail end slip casting pipe tip is provided with the ball valve, the ball valve is linked together with the slip casting hose, tail end slip casting pipe tip exposes in concrete lining wall inboard, its characterized in that: the sealing unit comprises a flange and a sealing gasket, the sealing gasket is arranged between the flange and the concrete lining wall, a circle of concentric bolt holes are formed in the flange, a mounting hole is formed in the center of the flange, a sealing pipe is arranged in the mounting hole, a sealing cap is arranged at one end of the sealing pipe, a reserved groove is formed in one end of the sealing pipe matched with the sealing cap, and a sealing layer in a shape of a Chinese character 'ji' is arranged in the reserved groove; the front end of the middle grouting pipe is provided with a joint guide pipe spigot end which is connected with a joint guide pipe fixed end arranged on the inner wall of the middle grouting pipe into a whole, and the rear end of the middle grouting pipe is flat; the pipe walls of the first section grouting pipe and the middle section grouting pipe are provided with quincuncial grouting holes, the grouting holes are through holes, the grouting holes are step holes converging from the outer wall to the inner wall, and hand-coating type shield tail sealing grease is filled in the grouting holes.
2. A tunnel radial grouting device as claimed in claim 1, wherein: the said several sealing layers are set in single layer or in multiple layers.
3. A tunnel radial grouting device as claimed in claim 1, wherein: the front end of the first section grouting pipe is conical, and the rear end of the first section grouting pipe is flat.
4. A tunnel radial grouting device as claimed in claim 1, wherein: the front end of the tail end grouting pipe is provided with a joint guide pipe spigot end, the joint guide pipe spigot end and a joint guide pipe fixed end arranged on the inner wall of the tail end grouting pipe are connected into a whole, and a connecting screw thread matched with the ball valve is processed on the inner wall of the rear end grouting pipe.
5. A grouting method of a tunnel radial grouting device according to any one of claims 1 to 4, comprising the steps of:
S1, drilling and coring at the concrete lining wall position where the well is detected to exist and the grouting area is needed, wherein the coring depth is smaller than the thickness of the structural layer, and a concrete protection layer with the thickness of 3-5 cm is reserved at the bottom of the hole;
S2, mounting an orifice sealing unit: an expansion bolt is adopted to fix the flange at the orifice, and a sealing pipe, a plurality of sealing layers and a sealing cap are installed step by step;
S3, driving the grouting pipe by adopting a drilling machine in a segmented manner, breaking the reserved concrete protection layer by impact by utilizing the pointed cone shape of the front end of the first-segment grouting pipe, driving the subsequent grouting pipe in a segmented manner, and finally completing the installation of the grouting pipe according to the position condition of the grouting hole;
S4, sealing the cap in a re-close manner, and sealing a gap between the sealing layers and the outer wall of the grouting pipe;
S5, installing a ball valve, wherein the ball valve is connected with a grouting hose, and the grouting hose is connected with grouting equipment;
s6, opening a ball valve, and grouting;
s7, after grouting is completed, closing the ball valve, disassembling the grouting hose, detecting and rechecking the filling condition of the wall back cavity by adopting a geological radar, and performing repeated grouting if necessary;
S8, dismantling the ball valve after the slurry is initially set;
S9, removing the orifice sealing unit after the slurry is finally solidified, cutting off the exposed steel pipe, and sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811356836.XA CN109184750B (en) | 2018-11-15 | 2018-11-15 | Tunnel radial grouting device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811356836.XA CN109184750B (en) | 2018-11-15 | 2018-11-15 | Tunnel radial grouting device and method |
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| Publication Number | Publication Date |
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| CN109184750A CN109184750A (en) | 2019-01-11 |
| CN109184750B true CN109184750B (en) | 2024-06-28 |
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| CN201811356836.XA Active CN109184750B (en) | 2018-11-15 | 2018-11-15 | Tunnel radial grouting device and method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110295597A (en) * | 2019-05-27 | 2019-10-01 | 山西临汾市政工程集团股份有限公司 | Close to buildings Soft Clay pattern foundation pit supporting structure steel sheet pile is pulled out and grouting strengthening method |
| CN111058864A (en) * | 2019-11-29 | 2020-04-24 | 中铁九局集团第四工程有限公司 | Tunnel vault lining rear cavity high-pressure grouting auxiliary device |
| CN111156032B (en) * | 2020-01-20 | 2024-04-02 | 杭州临安中民筑友智造科技有限公司 | Grouting pipe inserted section steel grouting reinforcement existing subway tunnel structure and method |
| CN111305841B (en) * | 2020-02-20 | 2021-07-27 | 河南理工大学 | A kind of coal seam grouting filling equipment |
| CN111396090A (en) * | 2020-04-24 | 2020-07-10 | 中国铁建重工集团股份有限公司 | Grouting joint for construction of double-shield TBM |
| CN112031657B (en) * | 2020-08-28 | 2022-04-22 | 浙大城市学院 | Tunnel lining permeation destruction treatment device and construction method thereof |
| CN112982372A (en) * | 2021-03-11 | 2021-06-18 | 中国建筑第八工程局有限公司 | Inner drilling pipe insertion pipe compaction grouting reinforcement method based on pipe gallery bottom plate cavity |
| CN112982486A (en) * | 2021-03-11 | 2021-06-18 | 中国建筑第八工程局有限公司 | Be used for prosthetic interior drilling intubate densification slip casting reinforcing apparatus of piping lane bottom plate cavity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101761345A (en) * | 2010-01-12 | 2010-06-30 | 中国建筑西南勘察设计研究院有限公司 | Reinforcement device for tunnel top soil and construction method thereof |
| CN206681760U (en) * | 2017-04-28 | 2017-11-28 | 中铁十八局集团有限公司 | Deep hole grouting device after shield duct piece wall |
| CN209083292U (en) * | 2018-11-15 | 2019-07-09 | 中铁二十一局集团轨道交通工程有限公司 | A kind of tunnel radial grouting device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203022770U (en) * | 2013-01-16 | 2013-06-26 | 中铁一局集团有限公司 | Grouting device for shield tunnel |
| CN105298433B (en) * | 2015-09-21 | 2017-10-10 | 河南理工大学 | A kind of waterpower pressure, rush, take out integrated hole sealing device and method |
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2018
- 2018-11-15 CN CN201811356836.XA patent/CN109184750B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761345A (en) * | 2010-01-12 | 2010-06-30 | 中国建筑西南勘察设计研究院有限公司 | Reinforcement device for tunnel top soil and construction method thereof |
| CN206681760U (en) * | 2017-04-28 | 2017-11-28 | 中铁十八局集团有限公司 | Deep hole grouting device after shield duct piece wall |
| CN209083292U (en) * | 2018-11-15 | 2019-07-09 | 中铁二十一局集团轨道交通工程有限公司 | A kind of tunnel radial grouting device |
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