CN110714792A - Urban deep-buried tunnel partition sectional water-stopping comprehensive construction method - Google Patents
Urban deep-buried tunnel partition sectional water-stopping comprehensive construction method Download PDFInfo
- Publication number
- CN110714792A CN110714792A CN201911158158.0A CN201911158158A CN110714792A CN 110714792 A CN110714792 A CN 110714792A CN 201911158158 A CN201911158158 A CN 201911158158A CN 110714792 A CN110714792 A CN 110714792A
- Authority
- CN
- China
- Prior art keywords
- ring
- grouting
- water
- lining
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- 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
- 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
Abstract
The invention discloses a regional and sectional water-stopping comprehensive construction method for an urban deep-buried tunnel, which comprises the steps of respectively dividing a common region, a special water-rich region and a transition region, and taking each ring at two end positions as a chemical slurry plugging ring after dividing the special water-rich region according to a ring lining segment; filling annular gaps between the rest lining segments and the stratum by common mortar, and backfilling cement paste after the construction of the chemical grout sealing ring is finished; the construction mode of the common mortar formed by backfilling cement paste is that all lining segments between two plugging rings of each area are subjected to row grouting from the bottom, the middle and the top in sequence, and each row adopts a retreating type grouting sequence opposite to the tunneling direction. Through the innovative combined subsection partition water stop mode, the tunnel construction quality and progress are ensured, and the problems of influences on the peripheral hydrological environment caused by tunnel construction and the problems of water leakage and seepage of the finished tunnel are effectively solved.
Description
Technical Field
The invention relates to a water stopping process for an urban tunnel, in particular to a comprehensive construction method for sectionalized water stopping of the urban tunnel under a deep burying condition.
Background
In the current urban tunnel construction in China, the waterproof and water stop of the duct piece are mainly carried out by the comprehensive action of the duct piece, a wall thickness filling layer, a water stop strip, a duct piece bolt and other conventional methods. Influenced by urban geographical position, hydrogeological conditions and surrounding environment, inevitably can meet the high pressure rich water stratum construction that leads to because the water conservancy intercommunication, this quality safety in not only needing to guarantee the tunnel work progress, still need properly solve the tunnel completion back section of jurisdiction ooze, leak water difficult problem.
For the waterproof and water-stop construction of pipe pieces under the urban deep-buried condition, due to the complex construction environment, a comprehensive construction method which is safe, reliable, fast in progress and good in quality and can effectively avoid a series of problems that the leakage and water leakage of the pipe pieces affect the tunnel construction quality and appearance needs to be found.
Disclosure of Invention
The invention aims to provide a safe, reliable, strong-operability and high-cost-performance urban deep-buried tunnel sectional water-stopping comprehensive construction method, which can ensure construction quality and construction safety, accelerate tunnel construction progress and reduce influence of construction on the hydrological environment around the tunnel.
Therefore, the technical scheme adopted by the invention is as follows: a city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method, the said city deep-buried tunnel is divided into ordinary district, special water-rich district, and the transition district between ordinary district and special water-rich district;
for a common area, lining duct pieces according to every N1 rings for partitioning, taking each ring at two end positions of each area as a double-liquid-slurry plugging ring, and filling double-liquid slurry in an annular gap between the double-liquid-slurry plugging ring and a stratum to perform full-ring closed water-stopping grouting in the area; annular gaps between the rest lining segments and the stratum are filled with common mortar, and the common mortar can be formed by synchronous grouting when the lining segments are laid or can be formed by backfilling cement paste after the construction of the double-liquid-paste plugging ring is finished;
for a special water-rich area, dividing the area into zones according to every N2 ring lining segment, taking each ring at two end positions of each zone as a chemical grout plugging ring, and filling chemical grout into an annular gap between each chemical grout plugging ring and a stratum to perform full-ring closed water-stopping grouting in the zone; filling annular gaps between the rest lining segments and the stratum by using common mortar, and backfilling cement paste after the construction of the chemical grout sealing ring by using the common mortar;
for a transitional section, lining pipe pieces are divided into zones according to every N3 rings, each ring at two end positions of each zone is taken as a double-liquid-slurry plugging ring, and double-liquid slurry is filled in an annular gap between the double-liquid-slurry plugging ring and a stratum to perform full-ring closed water-stopping grouting in the zone; annular gaps between the rest lining segments and the stratum are filled with common mortar, and the common mortar can be formed by synchronous grouting when the lining segments are laid or can be formed by backfilling cement paste after the construction of the double-liquid-paste plugging ring is finished;
wherein N1 is more than N3 is more than N2;
the construction method of the common mortar formed by backfilling cement paste is that all lining segments between two plugging rings in each area are subjected to split grouting in sequence from bottom to middle and top, each row adopts a retreating type grouting sequence opposite to the tunneling direction, and a plurality of lining segments are sequentially selected at intervals during split grouting to perform grouting, so that the lining segment wall is guaranteed to be tightly filled.
As the optimization of the scheme, the 1 st ring, the 5 th ring and the 8 th ring … … of the lining segment are sequentially selected for interval grouting during the branch grouting, the slurry outlet phenomenon of the grouting holes of each lining segment from 2 rings to 5 rings is observed in the 1 st ring grouting process, and if the 5 th ring grouting hole is slurry outlet and the grouting pressure reaches 0.2 MPa-
Stopping grouting at 0.3MPa, keeping for 5min, finishing grouting the 1 st annular hole, filling the 5 th annular hole, and so on; if the grouting holes of the 2 nd, 3 rd and 4 th rings do not discharge the slurry, the 2 nd, 3 rd or 4 th rings are injected until the grouting holes from the 2 nd ring to the 5 th ring all discharge the slurry, and then the next circulation of grouting is performed.
More preferably, the N1 ring is 25 to 35 rings, the N2 ring is 8 to 12 rings, and the N3 ring is 16 to 24 rings.
Preferably, the common area is a mudstone and medium-fine sandstone area, the special water-rich area is a water-rich area containing gravelly sandstone and an interlayer fracture zone, and the transition area is a coarse sandstone area.
Further preferably, the chemical slurry is Marangoni.
Preferably, a micro-expanding agent is added into the common mortar, the final setting time is 3-10 h, a high early strength section is provided for a highly permeable stratum and a section needing grouting, the proportion is adjusted and the early strength agent is added in a field test; the strength of the consolidation body is not less than 0.2MPa in one day and not less than 2.5MPa in 28 days; when the grouting pressure reaches the design pressure and the grouting amount reaches 80% of the design grouting amount, the grouting is finished.
Preferably, the grouting pressure is 0.1-0.2 MPa higher than the water and soil pressure of a driving surface during normal driving, and the filling coefficient of the grouting amount in a rock stratum with developed cracks is 130-180 percent; in relatively complete bedrock, the filling coefficient of the grouting amount is 120-160 percent; the grouting quality is checked by adopting a geological radar and an ultrasonic detection method, and supplementary grouting is carried out on the part which does not meet the requirement; for the geophysical abnormal part, drilling verification is required; the circumferential measuring lines are positioned in the middle of the ring pipe piece, and the distance between every two adjacent circumferential measuring lines is 10.
The invention has the beneficial effects that: according to the characteristics of strata (including water content and stratum components) in the construction process of the urban deep-buried tunnel, the tunnel construction is divided into a common section, a special water-rich section and a transition section, the water-stopping requirements of the common section, the special water-rich section and the transition section are continuously increased, and three different sections are respectively prevented from being pertinently stopped in three different modes. Through the innovative combined subsection partition water stop mode, the tunnel construction quality and progress are ensured, and the problems of influences on the peripheral hydrological environment caused by tunnel construction and the problems of water leakage and seepage of the finished tunnel are effectively solved. The invention provides a safe, high-quality, clear-thought, economic and reasonable comprehensive construction method aiming at the problem of high-pressure rich water caused by hydraulic communication under the condition of urban deep burying, and has the characteristics of safety, reliability, excellent quality, strong operability, quick construction progress, small environmental damage and the like.
Drawings
Fig. 1 is a sectional water stopping structure for partition in a common section.
Fig. 2 is a sectional water stopping structure of a water-rich area.
Fig. 3 is a left side view of fig. 1 and 2.
FIG. 4 is a step diagram of the grout backfill.
Detailed Description
The invention will be further illustrated by the following examples in conjunction with the accompanying drawings:
a city deep-buried tunnel sectional subsection water-stop comprehensive construction method divides a city deep-buried tunnel into a common section, a special water-rich section and a transition section between the common section and the special water-rich section.
The common area refers to a mudstone and medium and fine sandstone area, the special water-rich area refers to a water-rich area containing a gravel sandstone and an interlayer fracture zone, and the transition area refers to a coarse sandstone area.
Referring to fig. 1 and 3, for a common section, each 30 rings of lining segment 1 are partitioned, and each ring at two end positions is taken as a double-slurry plugging ring in each zone. And filling double-liquid slurry 2 in an annular gap between the double-liquid-slurry plugging ring and the stratum to perform full-ring closed water-stopping grouting in the area. The annular gap between the rest 28-ring lining segment 1 and the stratum is filled with common mortar 3. The common mortar 3 can be formed by synchronous grouting when the lining segment 1 is laid, or can be formed by backfilling cement paste after the construction of the double-liquid-slurry plugging ring is finished.
As shown in fig. 2 and 3, for the special water-rich area, the lining segment 1 is divided into 10 rings, and one ring at each end position is taken as a chemical slurry plugging ring. And filling chemical grout 4 into an annular gap between the chemical grout plugging ring and the stratum to perform full-ring closed water-stopping grouting in the area. Annular gaps between the rest 8-ring lining segments 1 and the stratum are filled with common mortar 3, and the common mortar 3 is formed by backfilling cement paste after the chemical slurry plugging ring is constructed.
And for the transition section, dividing the lining duct piece into 20 rings, and taking each ring at two end positions of each section as a double-slurry plugging ring. And filling double-liquid slurry in an annular gap between the double-liquid-slurry plugging ring and the stratum to perform full-ring closed water-stopping grouting in the area, wherein the construction mode is the same as that of the double-liquid-slurry plugging ring in a common area. Annular gaps between the rest 18 lining segments and the stratum are filled with common mortar 3, and the common mortar 3 can be formed by synchronous grouting when the lining segments 1 are laid or can be formed by backfilling cement paste after the construction of the double-liquid-paste plugging ring is finished.
Suppose that: the common section is partitioned according to every N1 ring lining segment, the special water-rich section is partitioned according to every N2 ring lining segment, and the transition section is partitioned according to every N3 ring lining segment, so that N1 is required to be more than N3 and more than N2. Preferably: n1 takes the form of a 25-35 ring, N2 takes the form of an 8-12 ring, and N3 takes the form of a 16-24 ring.
The construction mode of the common mortar 3 formed by backfilling cement paste is that all lining segments 1 between two plugging rings of each area are subjected to row grouting from the bottom, the middle and the top in sequence as shown in figure 4. Each row adopts a reverse back grouting sequence in the opposite heading direction, as indicated by the arrows in the figure. And during the parallel grouting, a plurality of lining segments 1 are selected at intervals in sequence for grouting, so that the uniform slurry discharge of each ring of lining segments 1 is ensured.
During the branch grouting, the 1 st ring, the 5 th ring and the 8 th ring … … of the lining segment 1 are preferably selected in sequence for interval grouting, and the grout outlet phenomenon from the 2 st ring to the 5 th ring of each grouting hole of the lining segment 1 is observed in the 1 st ring grouting process. And if the 5 th ring grouting hole is discharged and the grouting pressure reaches 0.2-0.3 MPa, stopping grouting and keeping for 5min, finishing grouting the 1 st ring hole, filling the 5 th ring hole, and the like. If the grouting holes of the 2 nd, 3 rd and 4 th rings do not discharge the slurry, the 2 nd, 3 rd or 4 th rings are injected until the grouting holes from the 2 nd ring to the 5 th ring all discharge the slurry, and then the next circulation of grouting is performed.
In order to reduce the hardening shrinkage of the mortar material, a micro-expansion agent is preferably added into the common mortar 3. The slurry has good water dispersibility resistance and injectability, the final setting time is 3-10 h, and the gelation time is adjusted by adding a coagulant and changing the mixture ratio through a field test according to the formation condition and the tunneling speed. For the highly permeable stratum and the section needing grouting and providing higher early strength, the proportion is adjusted and the early strength agent is added in the field test, so that the gelling time is shortened, the early strength is obtained, and the good grouting effect is ensured. The strength of the consolidation body is not less than 0.2MPa in one day and not less than 2.5MPa in 28 days. And simultaneously managing the grouting amount and the grouting pressure during grouting operation, and finishing grouting when the grouting pressure reaches the design pressure and the grouting amount reaches 80% of the design grouting amount.
The grouting pressure is 0.1-0.2 MPa higher than the water-soil pressure of a driving surface during normal driving, and the filling coefficient of the grouting amount in a rock stratum with developed cracks is 130-180 percent; in relatively complete bedrock, the filling coefficient of the grouting amount is 120-160 percent; the grouting quality is checked by adopting a geological radar and an ultrasonic detection method, and supplementary grouting is carried out on the part which does not meet the requirement; for the geophysical abnormal part, drilling verification is required; the circumferential measuring lines are positioned in the middle of the ring pipe piece, and the distance between every two adjacent circumferential measuring lines is preferably 10 rings of lining pipe pieces.
Claims (7)
1. The utility model provides a city buries tunnel subregion segmentation stagnant water comprehensive construction method deeply, the city buries tunnel deeply and divide into ordinary district, special rich water district to and the transition district between ordinary district and special rich water district, its characterized in that:
for a common area, lining duct pieces according to every N1 rings for partitioning, taking each ring at two end positions of each area as a double-liquid-slurry plugging ring, and filling double-liquid slurry in an annular gap between the double-liquid-slurry plugging ring and a stratum to perform full-ring closed water-stopping grouting in the area; annular gaps between the rest lining segments and the stratum are filled with common mortar, and the common mortar can be formed by synchronous grouting when the lining segments are laid or can be formed by backfilling cement paste after the construction of the double-liquid-paste plugging ring is finished;
for a special water-rich area, dividing the area into zones according to every N2 ring lining segment, taking each ring at two end positions of each zone as a chemical grout plugging ring, and filling chemical grout into an annular gap between each chemical grout plugging ring and a stratum to perform full-ring closed water-stopping grouting in the zone; filling annular gaps between the rest lining segments and the stratum by using common mortar, and backfilling cement paste after the construction of the chemical grout sealing ring by using the common mortar;
for a transitional section, lining pipe pieces are divided into zones according to every N3 rings, each ring at two end positions of each zone is taken as a double-liquid-slurry plugging ring, and double-liquid slurry is filled in an annular gap between the double-liquid-slurry plugging ring and a stratum to perform full-ring closed water-stopping grouting in the zone; annular gaps between the rest lining segments and the stratum are filled with common mortar, and the common mortar can be formed by synchronous grouting when the lining segments are laid or can be formed by backfilling cement paste after the construction of the double-liquid-paste plugging ring is finished;
wherein N1 is more than N3 is more than N2;
the construction method of the common mortar formed by backfilling cement paste is that all lining segments between two plugging rings in each area are subjected to split grouting in sequence from bottom to middle and top, each row adopts a retreating type grouting sequence opposite to the tunneling direction, and a plurality of lining segments are sequentially selected at intervals during split grouting to perform grouting, so that the lining segment wall is guaranteed to be tightly filled.
2. The city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method according to claim 1, characterized by: sequentially selecting a 1 st ring, a 5 th ring and an 8 th ring … … of the lining segment to perform interval grouting during the branch grouting, observing the grout outlet phenomenon of each grouting hole from the 2 st ring to the 5 th ring of the lining segment in the 1 st ring grouting process, stopping grouting and keeping for 5min if the grout outlet of the 5 th ring grouting hole reaches the grouting pressure of 0.2-0.3 MPa, finishing the grouting of the 1 st ring hole, grouting the 5 th ring hole, and repeating the steps; if the grouting holes of the 2 nd, 3 rd and 4 th rings do not discharge the slurry, the 2 nd, 3 rd or 4 th rings are injected until the grouting holes from the 2 nd ring to the 5 th ring all discharge the slurry, and then the next circulation of grouting is performed.
3. The city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method according to claim 1, characterized by: the N1 ring is 25-35, the N2 ring is 8-12, and the N3 ring is 16-24.
4. The city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method according to claim 1, characterized by: the common section refers to a mudstone and medium and fine sandstone section, the special water-rich section refers to a water-rich section containing a gravel sandstone and an interlayer fracture zone, and the transition section refers to a coarse sandstone section.
5. The city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method according to claim 1, characterized by: the chemical slurry is Margani.
6. The city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method according to claim 1, characterized by: the common mortar is added with a micro-expanding agent, the final setting time is 3-10 h, a high early strength section is provided for a highly permeable stratum and a section needing grouting, the proportion is adjusted and the early strength agent is added in a field test; the strength of the consolidation body is not less than 0.2MPa in one day and not less than 2.5MPa in 28 days; when the grouting pressure reaches the design pressure and the grouting amount reaches 80% of the design grouting amount, the grouting is finished.
7. The city deep-buried tunnel subregion segmentation stagnant water comprehensive construction method according to claim 6, characterized by: the grouting pressure is 0.1-0.2 MPa higher than the water-soil pressure of a driving surface during normal driving, and the grouting amount filling coefficient is 130-180% in a rock stratum with developed cracks; in relatively complete bedrock, the filling coefficient of the grouting amount is 120-160 percent; the grouting quality is checked by adopting a geological radar and an ultrasonic detection method, and supplementary grouting is carried out on the part which does not meet the requirement; for the geophysical abnormal part, drilling verification is required; the circumferential measuring lines are positioned in the middle of the ring pipe piece, and the distance between every two adjacent circumferential measuring lines is 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158158.0A CN110714792A (en) | 2019-11-22 | 2019-11-22 | Urban deep-buried tunnel partition sectional water-stopping comprehensive construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911158158.0A CN110714792A (en) | 2019-11-22 | 2019-11-22 | Urban deep-buried tunnel partition sectional water-stopping comprehensive construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110714792A true CN110714792A (en) | 2020-01-21 |
Family
ID=69215538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911158158.0A Pending CN110714792A (en) | 2019-11-22 | 2019-11-22 | Urban deep-buried tunnel partition sectional water-stopping comprehensive construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110714792A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647974A (en) * | 2020-12-22 | 2021-04-13 | 湖北省大唐安盛建筑工程有限公司 | Tunnel construction grouting process method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005048497A (en) * | 2003-07-30 | 2005-02-24 | Taisei Corp | Method for inhibiting precipitation of efflorescence |
| CN110259467A (en) * | 2019-05-21 | 2019-09-20 | 重庆大学 | Rivers construction method is worn under slurry balance shield |
-
2019
- 2019-11-22 CN CN201911158158.0A patent/CN110714792A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005048497A (en) * | 2003-07-30 | 2005-02-24 | Taisei Corp | Method for inhibiting precipitation of efflorescence |
| CN110259467A (en) * | 2019-05-21 | 2019-09-20 | 重庆大学 | Rivers construction method is worn under slurry balance shield |
Non-Patent Citations (4)
| Title |
|---|
| 杨俊哲: "盾构施工斜井富水地段防水处置技术研究", 《低碳世界》 * |
| 杨俊哲等: "《盾构施工煤矿长距离斜井关键技术》", 31 December 2016, 中国铁道出版社 * |
| 沙明元: "《斜井工程隧道掘进机施工技术》", 31 October 2016, 中国铁道出版社 * |
| 游龙飞: "TBM施工煤矿斜井防排水设计研究", 《施工技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647974A (en) * | 2020-12-22 | 2021-04-13 | 湖北省大唐安盛建筑工程有限公司 | Tunnel construction grouting process method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105041325B (en) | Construction method of high-tension water-rich extra-large-section weak breccia tunnel | |
| CN103291325B (en) | The preventing control method of Coal-mining Above Confined-water floor strata gushing water | |
| CN102767377B (en) | Loess strata subway tunnel earth pressure balance shield construction method | |
| CN204476470U (en) | A kind of waterproof and water drainage system of applicable tunnel project seam | |
| CN103306684A (en) | Process for grouting on back of shield segment | |
| CN103277120A (en) | Post-unfreezing water burst prevention method of non-full-depth freezing vertical shaft | |
| CN110924962A (en) | Construction method for filling and grouting behind segment wall of EPB-TBM dual-mode shield | |
| CN102660952B (en) | Controllable clay paste slurry grouting technique | |
| CN103510964A (en) | Method for performing backfill grouting on pea gravel by adoption of shield type TBM in construction process | |
| CN105386435B (en) | It is a kind of to be used for the double-liquid grouting system and its construction technology of cement and water glass solution | |
| CN101200897A (en) | Construction method for grouting curtain combined with steel reinforced concrete guard ring | |
| CN110130936A (en) | It dashes forward in a kind of shield tunneling process and meets the construction method of untreated solution cavity or crack | |
| CN102296621A (en) | Construction method of ground sectional water-stop curtain | |
| CN112482415B (en) | Consolidation grouting method for underground cavern under high external water pressure and flowing water condition | |
| CN109763845B (en) | Construction method for preventing and controlling water by constructing L-shaped grouting closure curtain | |
| CN110241837A (en) | A kind of construction method for preventing basement bottom board from cracking under high artesian geological conditions | |
| CN110714792A (en) | Urban deep-buried tunnel partition sectional water-stopping comprehensive construction method | |
| CN105569665A (en) | Tool changing construction method realizing soil mass reinforcement from outside of soil room for earth pressure balance shield machine in sand layer | |
| CN110821498B (en) | Safe and rapid water plugging and reinforcing method in strong water-rich soft surrounding rock of operation tunnel | |
| CN114411640B (en) | Construction method for reinforcing and repairing rock-fill core wall dam | |
| CN212837841U (en) | Shield tunnel segment wall post-grouting combined structure | |
| CN105257306A (en) | Reinforced warehouse-filling cutter-replacement construction method in shield tunneling machine warehouse | |
| CN205296194U (en) | Rich irrigated land layer undercut tunnel interlock pipe curtain | |
| CN210033461U (en) | Segment lining grouting system based on externally-embedded channel and stretchable bag | |
| CN109519176B (en) | Mining tunnel grouting reinforcement method and structure for water-rich granite residual soil stratum |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200121 |
|
| RJ01 | Rejection of invention patent application after publication |