CN113356881A - Segment deep grouting method for treating tunnel leakage diseases - Google Patents
Segment deep grouting method for treating tunnel leakage diseases Download PDFInfo
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- CN113356881A CN113356881A CN202110809527.9A CN202110809527A CN113356881A CN 113356881 A CN113356881 A CN 113356881A CN 202110809527 A CN202110809527 A CN 202110809527A CN 113356881 A CN113356881 A CN 113356881A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 201000010099 disease Diseases 0.000 title claims abstract description 23
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 229920001971 elastomer Polymers 0.000 claims abstract description 36
- 239000011440 grout Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 238000005553 drilling Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 62
- 229920002635 polyurethane Polymers 0.000 claims description 24
- 239000004814 polyurethane Substances 0.000 claims description 24
- 239000004568 cement Substances 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000000903 blocking effect Effects 0.000 description 6
- 239000012466 permeate Substances 0.000 description 6
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005187 foaming Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000007569 slipcasting Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 229920002396 Polyurea Polymers 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
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- 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
- 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
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/385—Sealing means positioned between adjacent lining members
- E21D11/386—Sealing means positioned between adjacent lining members inflatable sealing means
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- 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
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (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)
- Sealing Material Composition (AREA)
Abstract
The invention relates to a segment deep grouting method for treating tunnel leakage diseases, which comprises the following steps: drilling a grouting hole at the intersection point of the circular seam with the seepage water and the longitudinal seam close to the circular seam until the segment failure rubber water stop belt is drilled; installing a grouting nozzle in the grouting hole, and injecting grout through the grouting nozzle by using a high-pressure grouting pump, wherein the grout flows along the groove for installing the rubber waterstop and fills a gap between the rubber waterstop and the groove; and stopping grouting when the grouting stopping condition is met. Compared with the prior art, the invention has the advantages of low re-leakage rate, long quality guarantee period, low maintenance cost, high construction efficiency, good sealing effect and the like.
Description
Technical Field
The invention relates to a tunnel maintenance technology, in particular to a segment deep grouting method for treating tunnel leakage diseases.
Background
Subway tunnels are generally built in the depth of 20-40 meters underground, circular tunnels are formed by splicing concrete prefabricated segments, and waterproof mechanisms among the segments are completed through tenon-and-mortise structures among the segments, elastic rubber water stop bars and sealing gaskets at positions 8-10 cm close to the upstream surface. When the tunnel has physical changes such as convergence deformation and settlement or the segments are assembled, the structure is staggered, so that the rubber water stop strips are invalid, gaps appear in the tenon-and-mortise structure, silt water enters the tunnel under the action of confined water to form seepage water and seepage silt diseases, a vicious circle of 'seepage silt-soil erosion-settlement deformation-gap expansion' can be formed when the diseases are serious, and the seepage water diseases are a great hidden danger to the operation safety of the tunnel.
The tunnel segment leakage renovation method is mainly divided into in-wall grouting and after-wall grouting, as shown in figures 3 and 4, the traditional in-wall grouting method is characterized in that holes are drilled at the circular seams 3 to the mortise and tenon parts 2 of the segment, grouting operation is carried out through the drilled holes, grouting points 9 are located at the bottom ends of the drilled holes, the drilling depth is not more than 10 cm, and the method has the following problems:
1. before grouting, double-quick cement dry powder needs to be laid on the circular seam 3 for sealing operation, so that the situation that the slurry overflows from the circular seam 3 too quickly is prevented, and when equipment such as tunnel electric cables, pipelines and the like exist at a damaged part, removal operation needs to be carried out, so that an operation surface is made out, and time and labor are wasted;
2. when pressure grouting is carried out, the mortise and tenon parts 2 have good sealing performance, most of slurry can transversely permeate at one side of the mortise and tenon parts 2 due to pressure difference caused by gap sealing performance difference, meanwhile, the initiation time of the two-component polyurethane slurry is less than or equal to 20s, the solidification time is less than or equal to 60s, the rapid foaming reaction speed retards the permeation of the slurry to a water seepage point, and under the comprehensive influence, the slurry cannot effectively permeate the mortise and tenon parts 2 to reach a seepage source, so that a water seepage channel of seepage water is changed after grouting, the seepage water can permeate from other weak links again, a new seepage water disease is formed, and the temporary solution is treated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a segment deep grouting method for treating tunnel leakage diseases, which has the advantages of low re-leakage rate, long quality guarantee period, low maintenance cost, high construction efficiency and good sealing effect.
The purpose of the invention can be realized by the following technical scheme:
a deep segment grouting method for treating tunnel leakage diseases comprises the following steps:
drilling a grouting hole at the intersection point of the circular seam with the seepage water and the longitudinal seam close to the circular seam until the segment failure rubber water stop belt is drilled;
installing a grouting nozzle in the grouting hole, and injecting grout through the grouting nozzle by using a high-pressure grouting pump, wherein the grout flows along the groove for installing the rubber waterstop and fills a gap between the rubber waterstop and the groove;
stopping grouting the grouting nozzle when the grouting stopping condition is met;
the gap of the tunnel segment close to the upstream face is generally large, under the action of grouting pressure, the slurry can permeate into the soil body, the mortise and tenon part and the gap between the ineffective rubber waterstop and the groove before solidification, the ineffective rubber waterstop is effectively repaired, a new water seepage channel is prevented from being generated, and the quality guarantee period is prolonged;
the slip casting hole is striden the seam and is arranged the intersect department at circumferential weld and longitudinal joint, can avoid damaging the mortise and tenon portion of tunnel section of jurisdiction, and the direct inefficacy rubber waterstop position of while is leaking stoppage in the source of seeping water, radical cure infiltration point, simultaneously because the direct inefficacy rubber waterstop of slip casting position and groove are located, need not to seal the circumferential weld through laying double-fast cement before the slip casting, reduced the process, avoid the tunnel to shelter from the dismouting of facility simultaneously, improved the efficiency of construction.
Further, the grouting stopping conditions are specifically as follows:
any one of the following conditions is satisfied:
slurry overflow occurs at the circular seam;
the high-pressure grouting pump keeps the set grouting pressure, and the running time reaches the set time.
Furthermore, when the annular seam overflows, the overflowing slurry is quickly reacted by a water spraying method to form the sealing waterproof film.
Furthermore, the wet fiber is filled into the position with serious slurry overflow, so that the overflowed slurry reacts and gathers around the wet fiber to form a blocking effect and delay the slurry overflow.
Furthermore, if water leakage occurs in multiple sections of circular seams, grouting is performed on each section of circular seams from high to low in sequence.
Further, if a plurality of leakage points appear on the circular seam, grouting is carried out on the leakage points in sequence according to the sequence of the water seepage from small to large.
And further, after grouting is completed, removing the slurry overflowing from the surface of the tunnel segment.
Further, after the grout is removed, spraying the quick-setting cement dry powder at the position where the seepage water appears on the circular seam, and determining whether the seepage water exists.
Furthermore, the slurry is double-component polyurethane slurry, the double-component polyurethane slurry reacts with leakage water after being injected into the position of the ineffective rubber water stop belt, carbon dioxide is generated to foam a system, the foaming pressure of the double-component polyurethane slurry can enable materials to generate secondary pressure, and therefore the slurry is permeated in a wider range, a water-insoluble polyurethane-polyurea polymer solidified body with a larger volume is formed, and the sealing effect is good.
Furthermore, the slurry is elastic gel polyurethane slurry, the characteristics of the elastic gel polyurethane slurry after being cured are closer to those of a rubber water stop belt, the sealing effect is good, and the elastic gel polyurethane slurry can expand when meeting water after being cured, so that the effects of water absorption and water blocking are more effectively achieved.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, a grouting hole is drilled at the intersection point of a circular seam with water seepage and a longitudinal seam close to the circular seam, the circular seam is drilled to the position of a segment failure rubber water stop, a grouting nozzle is installed in the grouting hole, a high-pressure grouting pump is utilized to inject grout through the grouting nozzle, the grout flows along a groove for installing the rubber water stop and fills the gap between the rubber water stop and the groove, when the grouting stop condition is met, grouting is stopped for the grouting nozzle, the gap of a tunnel segment close to the upstream face is generally large, under the action of grouting pressure, the grout can permeate into a soil body, a mortise and tenon part and the gap between the failure rubber water stop and the groove before solidification, the failure rubber water stop is effectively repaired, a new water seepage channel is prevented from being generated, the secondary leakage rate is low, the quality guarantee period is prolonged, and the maintenance cost is reduced;
(2) the filling hole is arranged at the intersection of the circular seam and the longitudinal seam, so that the mortise and tenon part of the tunnel segment can be prevented from being damaged, the service cycle of the tunnel segment is prolonged, the position of the ineffective rubber water stop belt is directly reached, the leakage stoppage is realized at the water seepage source, the water seepage point is radically controlled, and meanwhile, the grouting position directly reaches the ineffective rubber water stop belt and the pit position, double-speed cement does not need to be laid to seal the circular seam before grouting, so that the working procedures are reduced, the tunnel shielding facility is prevented from being disassembled and assembled, and the construction efficiency is improved;
(3) when the annular seam overflows, the overflowing slurry is quickly reacted by a water spraying method to form a sealing waterproof film, so that the slurry is prevented from losing, and the sealing effect is good;
(4) according to the invention, wet fiber is filled into a position with serious slurry overflow, so that the overflowed slurry is reacted and gathered around the wet fiber to form a blocking effect and the overflow of the slurry is delayed;
(5) when water leakage occurs in a plurality of sections of circular seams, grouting is sequentially performed on each section of circular seams from high to low, and when a plurality of leakage points occur on the circular seams, grouting is sequentially performed on each leakage point according to the sequence of water leakage from small to large, so that the slurry is ensured to be densely filled, and the sealing effect is good;
(6) after grouting is completed, the grout overflowing the surface of the tunnel segment is shoveled, and then the double-speed cement dry powder is scattered at the position of the circular seam where seepage water appears after the grout is shoveled, so that whether seepage water exists or not is determined, and the completion of seepage disease control is ensured;
(7) the slurry is double-component polyurethane slurry, after the double-component polyurethane slurry is injected into the position of the ineffective rubber water stop belt, the double-component polyurethane slurry reacts with leakage water to generate carbon dioxide to foam a system, and the foaming pressure of the double-component polyurethane slurry can enable materials to generate secondary pressure, so that the slurry is permeated in a wider range, a water-insoluble polyurethane-polyurea polymer solidified body with larger volume is formed, and the sealing effect is good.
(8) The slurry is elastic gel polyurethane slurry, the characteristics of the elastic gel polyurethane slurry are closer to those of a rubber water stop belt after the elastic gel polyurethane slurry is solidified, the sealing effect is good, and the elastic gel polyurethane slurry can expand when meeting water after being solidified, so that the effects of absorbing water and blocking water are more effectively achieved.
Drawings
FIG. 1 is a radial sectional view of a duct piece during grouting by the grouting method of the present invention;
FIG. 2 is an axial sectional view of a duct piece during grouting by the grouting method of the present invention;
FIG. 3 is a radial cross-sectional view of a segment as it is being grouted using a conventional in-wall grouting method;
FIG. 4 is a radial cross-sectional view of a segment as it would be grouted using a conventional in-wall grouting method;
FIG. 5 is a schematic view of the structure of a T-shaped slot;
FIG. 6 is a schematic structural view of a cross-shaped seam;
the reference numbers in the figures illustrate:
1. the rubber waterstop, 2, mortise and tenon parts, 3, circular seams, 4, a part close to the upstream surface, 5, leakage points, 6, longitudinal seams, 7, T-shaped seams, 8, cross seams and 9, grouting points.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A segment deep grouting method for treating tunnel leakage diseases is disclosed, as shown in figure 1 and figure 2, and comprises the following steps:
drilling a grouting hole at the intersection point of the circular seam 3 where seepage water occurs and the circular seam 3 and the longitudinal seam 6 which are close to the intersection point, and drilling to the position of the segment failure rubber water stop 1, wherein the depth of the grouting hole is not more than 20 cm for a double-circle tunnel, and not more than 27 cm for a single-circle tunnel;
installing a grouting nozzle in the grouting hole, wherein the end part of the grouting nozzle is close to the bottom of the grouting hole, forming a grouting point 9 at the bottom of the grouting hole, injecting grout through the grouting nozzle by using a high-pressure grouting pump, controlling the grouting pressure to be 0.2-0.4 mpa, diffusing the grout from the grouting point 9, flowing along a groove for installing the rubber waterstop 1, and filling a gap between the rubber waterstop 1 and the groove;
stopping grouting the grouting nozzle when the grouting stopping condition is met;
if water leakage occurs in the multiple sections of circular seams 3, grouting each section of circular seam 3 from high to low in sequence.
If a plurality of leakage points 5 appear on the circular seam 3, grouting is carried out on the leakage points 5 in sequence according to the sequence of the water seepage from small to large.
When the annular seam 3 overflows, the overflowing slurry is quickly reacted by a water spraying method to form a sealing waterproof film.
Filling wet fiber into the position with serious slurry overflow to make the slurry overflow and react and aggregate around the wet fiber to form blocking effect and delay slurry overflow;
and (3) after grouting is finished, shoveling the grout overflowing from the surface of the tunnel segment, and scattering the double-speed cement dry powder at the position where the seepage water appears on the circular seam 3 after the shoveling of the grout is finished, and determining whether the seepage water exists.
The gap of the tunnel segment close to the upstream surface 4 is generally large, under the action of grouting pressure, slurry can permeate into the soil body, the mortise and tenon part 2 and the gap between the ineffective rubber water stop 1 and the groove before solidification, the ineffective rubber water stop 1 is effectively repaired, a new water seepage channel is prevented from being generated, and the quality guarantee period is prolonged;
as shown in figure 5, the circular seam 3 and the longitudinal seam 6 are intersected to form a T-shaped seam 7, as shown in figure 6, the circular seam 3 and the longitudinal seam 6 are intersected to form a cross seam 8, a grouting hole is arranged at the intersection of the T-shaped seam 7 or the cross seam 8, the mortise and tenon part 2 of the tunnel segment can be prevented from being damaged, meanwhile, the position of the ineffective rubber water stop belt 1 is reached, the leakage stoppage is realized at the water seepage source, the water seepage point is radically controlled, meanwhile, the position of the grouting hole reaches the ineffective rubber water stop belt 1 and the pit position, and the circular seam 3 does not need to be sealed by laying double-speed cement before grouting, so that the working procedures are reduced, the tunnel shielding facility is prevented from being disassembled and assembled, and the construction efficiency is improved.
The grouting cutoff conditions are specifically as follows:
any one of the following conditions is satisfied:
slurry overflow occurs at the circular seam 3;
the high pressure grouting pump maintains a grouting pressure of 0.4mpa and operates for up to one minute.
The slurry is double-component polyurethane slurry, and the preparation ratio of the double-component polyurethane slurry is 100: 8, after the double-component polyurethane slurry is injected into the position of the ineffective rubber water stop 1, the double-component polyurethane slurry reacts with the leakage water to generate carbon dioxide to foam a system, and the foaming pressure of the double-component polyurethane slurry can enable materials to generate secondary pressure, so that the slurry can be permeated in a wider range, a water-insoluble polyurethane-polyurea polymer solidified body with a larger volume can be formed, and the sealing effect is good.
Example 2
In this embodiment, the slurry is elastic gel polyurethane slurry, which is cured to have a characteristic closer to that of a rubber water stop, and has a good sealing effect, and the elastic gel polyurethane slurry expands when meeting water, thereby more effectively absorbing and blocking water, and the rest is the same as that of embodiment 1.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A deep segment grouting method for treating tunnel leakage diseases is characterized by comprising the following steps:
drilling a grouting hole at the intersection point of the circular seam with the seepage water and the longitudinal seam close to the circular seam until the segment failure rubber water stop belt is drilled;
installing a grouting nozzle in the grouting hole, and injecting grout through the grouting nozzle by using a high-pressure grouting pump, wherein the grout flows along the groove for installing the rubber waterstop and fills a gap between the rubber waterstop and the groove;
and stopping grouting when the grouting stopping condition is met.
2. The deep duct piece grouting method for treating tunnel leakage diseases according to claim 1, characterized in that the grouting cutoff conditions are specifically as follows:
any one of the following conditions is satisfied:
slurry overflow occurs at the circular seam;
the high-pressure grouting pump keeps the set grouting pressure, and the running time reaches the set time.
3. The method for deeply grouting a duct piece for controlling tunnel leakage diseases according to claim 1, wherein when slurry overflows from the circular seams, the overflowing slurry is quickly reacted by a water spraying method to form a sealing waterproof film.
4. The deep duct piece grouting method for treating tunnel leakage diseases according to claim 1, characterized in that wet fiber filaments are filled into the positions with serious slurry overflow.
5. The deep grouting method for duct pieces for treating tunnel leakage diseases according to claim 1, wherein if water leakage occurs in a plurality of sections of circular seams, grouting is performed on each section of circular seam from high to low in sequence.
6. The deep duct piece grouting method for treating tunnel leakage diseases according to claim 1, characterized in that if a plurality of leakage points appear on the circumferential seams, grouting is performed on the leakage points in sequence from small to large according to the water seepage amount.
7. The deep grouting method for duct piece for treating tunnel leakage diseases according to claim 1, characterized in that after grouting, grout overflowing the surface of the duct piece of the tunnel is removed.
8. The method for deeply grouting duct pieces for controlling tunnel leakage diseases according to claim 7, wherein double-quick cement dry powder is scattered at the position where the seepage water appears on the circumferential seams after the grout is shoveled, and whether seepage water exists is determined.
9. The method for deeply grouting a duct piece for treating tunnel leakage diseases according to claim 1, wherein the slurry is a two-component polyurethane slurry.
10. The method for deep grouting of a duct piece for treating tunnel leakage disease according to claim 9, wherein the slurry is elastic gel polyurethane slurry.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115110368A (en) * | 2022-05-27 | 2022-09-27 | 郑州大学 | Method and device for preventing frost heaving thaw settlement grouting of reactive frozen soil highway subgrade thawing disk |
| CN118517290A (en) * | 2024-07-22 | 2024-08-20 | 中铁五局集团电务工程有限责任公司 | Method and equipment for plugging by needling on water facing side of shield tunnel |
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