CN110985007A - Construction process of subway communication channel - Google Patents
Construction process of subway communication channel Download PDFInfo
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- CN110985007A CN110985007A CN201911424282.7A CN201911424282A CN110985007A CN 110985007 A CN110985007 A CN 110985007A CN 201911424282 A CN201911424282 A CN 201911424282A CN 110985007 A CN110985007 A CN 110985007A
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- conductive plastic
- construction process
- plastic drainage
- communication channel
- drainage plate
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010276 construction Methods 0.000 title claims abstract description 42
- 238000004891 communication Methods 0.000 title claims abstract description 36
- 230000008569 process Effects 0.000 title claims abstract description 32
- 239000004033 plastic Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002689 soil Substances 0.000 claims abstract description 29
- 238000009412 basement excavation Methods 0.000 claims abstract description 26
- 239000002985 plastic film Substances 0.000 claims abstract description 16
- 229920006255 plastic film Polymers 0.000 claims abstract description 16
- 238000007711 solidification Methods 0.000 claims abstract description 7
- 230000008023 solidification Effects 0.000 claims abstract description 7
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 4
- 238000003780 insertion Methods 0.000 claims description 17
- 230000037431 insertion Effects 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 4
- 238000007596 consolidation process Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000008014 freezing Effects 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000005370 electroosmosis Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
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- 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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
-
- 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
-
- 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- 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
- E21D9/008—Driving transverse tunnels starting from existing tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Soil Sciences (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction process of a subway connecting channel, which comprises the following construction steps: expanding the excavation boundary for a certain distance to serve as a soft mud solidification treatment boundary, forming a hole in the boundary and inserting a conductive plastic drainage plate; the water outlet end of the conductive plastic drainage plate is communicated with a strainer, and the strainer is connected with a vacuum pump; the water outlet end of the conductive plastic drainage plate is connected with the wire network, and two adjacent rows of conductive plastic drainage plates are respectively connected to the positive electrode and the negative electrode of the power supply; laying a plastic film, wherein the periphery of the plastic film is hermetically connected to a segment of the tunnel; switching on a power supply, starting a vacuum pump, discharging moisture in the excavation area of the communication channel and a certain range around the excavation area from the conductive plastic drainage plate, and solidifying soft soil in the range; excavating and supporting a contact channel in the consolidated soil body; and after the reinforced concrete lining structure of the connection channel is finished, the jacks on the pipe pieces outside the range of the connection channel are sealed. The invention has the advantages of high efficiency and low energy consumption.
Description
Technical Field
The invention relates to the technical field of subway channel excavation construction, in particular to a construction process of a subway communication channel.
Background
As shown in fig. 1, a subway communication channel 3 refers to a transverse connecting channel of two parallel subway tunnels 1, generally arranged one at intervals of 500m-1000m, and used for moving workers and maintenance equipment from one subway tunnel 1 to the other subway tunnel 1 during subway maintenance; or when the train is stopped in an accident, the communication channel 3 is used for passenger transfer and evacuation. The communication channel 3 has a circular and a square channel with a cross-sectional dimension of about 2 x 2 m. In the prior art, when the stratum is easy to collapse and the underground water is more, the excavation of the communication channel 3 is generally constructed by adopting a freezing method. The freezing method is to freeze water in the stratum by using an artificial refrigeration technology, change natural rock soil into frozen soil, increase the strength and stability of the frozen soil, isolate the connection between underground water and underground engineering and conveniently excavate the connection channel 3 under the protection of a frozen wall. However, the construction by the freezing method has the problems of high energy consumption, frozen expansion and deformation of soil and long construction period. Therefore, a new construction process needs to be studied for the construction of the subway interconnecting duct 3. Particularly, the construction of the communication channel 3 in the stratum with large water content, such as soft mud, in the coastal region.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction process of a subway connecting channel, which has the advantages of providing a new construction method in soft mud geology, low energy consumption and high construction speed.
The above object of the present invention is achieved by the following technical solutions: the method comprises the following construction steps:
marking an excavation boundary of a communication channel on a segment of a subway tunnel, expanding the excavation boundary for a certain distance to serve as a soft mud solidification treatment boundary, and arranging a plurality of jacks for inserting conductive plastic drainage plates at equal intervals in the boundary;
inserting a conductive plastic drainage plate into the jack, wherein the insertion end of the conductive plastic drainage plate extends into a duct piece of another subway tunnel; the water outlet end of the conductive plastic drainage plate is exposed out of the pipe piece;
thirdly, the water outlet end of the conductive plastic drainage plate is communicated with a strainer, and the strainer is connected with a vacuum pump;
step four, the water outlet end of the conductive plastic drainage plate is connected with a wire network, and two adjacent rows of conductive plastic drainage plates are respectively connected to the positive electrode and the negative electrode of the power supply;
laying a plastic film to cover all the conductive plastic drainage plates and the water filter pipes, wherein the periphery of the plastic film is hermetically connected to a pipe piece of the tunnel;
step six, switching on a power supply, starting a vacuum pump, discharging moisture in the excavation area of the communication channel and a certain range around the excavation area from the conductive plastic drainage plate, and solidifying soft soil in the range;
removing the plastic film, the wire network and the water filter pipe, and excavating and supporting a contact channel in the consolidated soil body;
and step eight, after the reinforced concrete lining structure of the connection channel is finished, sealing the insertion holes in the pipe pieces outside the range of the connection channel.
By the technical scheme, the water in the range of the communication channel and the surrounding soil is discharged through the conductive plastic drainage plate under the electroosmosis action and the vacuum action, so that the soil body is solidified and has certain strength, and then the communication channel is excavated and supported; thereby solved the problem that can't directly excavate the cavern in the soft mud, in addition because the drainage rate of conductive plastic drain bar is fast, construction convenience compares the freezing method construction, has efficient, advantage that the energy consumption is low.
The invention is further configured to: and the soft mud solidification treatment boundary is extended by 1-2m compared with the excavation boundary of the communication channel.
Through the technical scheme, when the contact channel is excavated, the periphery of the contact channel is provided with solidified soil with the thickness of 1-2m as a protective isolation structure, and the soft mud in the flow plastic shape is isolated outside an excavation area, so that the normal excavation of the contact channel is ensured.
The invention is further configured to: the conductive plastic drainage plate is obliquely and upwards inserted into the soil body, and one end in the soil body is higher than one end in the pipe piece.
Through the technical scheme, the conductive plastic drainage plate forms a structure with a high inside and a low outside, and drainage of water in soil is facilitated.
The invention is further configured to: the distance between two adjacent rows of conductive plastic drainage plates is 15-80 cm.
Through above-mentioned technical scheme, the distance of adjacent conductive plastic drain bar is less, helps improving drainage efficiency, improves the efficiency of whole solidification.
The invention is further configured to: the duct pieces of the two tunnels are provided with jacks, the conductive plastic drainage plates are inserted, and the insertion ends of the conductive plastic drainage plates inserted from different tunnels are overlapped.
Through the technical scheme, when the distance between the two tunnels is long, namely the communication channel is long, water is drained from the two tunnels, so that the insertion depth of the conductive plastic drainage plate is reduced, and the insertion difficulty is reduced; the drainage efficiency of the two sides is higher; the insertion ends are overlapped to ensure that no blind area exists in the drainage within the length range of the communication channel.
The invention is further configured to: and fifthly, adhering the periphery of the plastic film to the tube sheet of the tunnel.
Through above-mentioned technical scheme, adopt glue to bond the plastic film on the tunnel segment, construction convenience is swift, and can reach fine guard's effect.
The invention is further configured to: and step two, after the conductive plastic drainage plate is inserted, sealing the gap between the conductive plastic drainage plate and the jack.
Through above-mentioned technical scheme, prevent that soft soil or silt from flowing from the space, polluting the tunnel section of jurisdiction.
The invention is further configured to: after drainage and consolidation, temporary supporting is carried out on the periphery of the communication channel by adopting an anchor rod grouting process, and then excavation is carried out.
Through above-mentioned technical scheme, to electrically conduct drainage and slip casting support and combine for form fine support system in geology that water content is big such as soft mud, guarantee the safety of excavation, when having solved in the similar stratum and directly carrying out stock slip casting, consolidate the poor problem of effect.
In conclusion, the invention has the following beneficial effects:
1. the construction process of the new connection channel is provided, the soil body is quickly solidified by adopting the dual functions of electroosmosis and vacuum, and then excavation is carried out in the solidified soil body, so that the construction process can be well suitable for the construction of the connection channel in the stratum with high moisture content, such as soft argillaceous texture, and the like in the coastal region;
2. compared with a freezing method, the process has the advantages that the drainage speed is high, the soil body can be solidified more quickly, and the construction efficiency is improved; after the electrified drainage soil body is consolidated, the consolidated soil body can resist water from entering again, so that the process does not need to be electrified all the time in the construction process, and has the advantage of low energy consumption compared with a freezing method; in addition, the process reinforces the soil body to avoid the related problems caused by the frost heaving of the soil body by a freezing method;
3. the method combines the conductive drainage with the grouting support, so that a good support system is formed in the geology with large water content such as soft mud, the safety of excavation is ensured, and the problem of poor grouting reinforcement effect in similar stratums is solved.
Drawings
FIG. 1 is a schematic diagram of a cross-connect channel in the background art;
FIG. 2 is a schematic view of a conductive plastic drainage plate inserted into a communication passage within a range to be reinforced;
FIG. 3 is an enlarged view of portion A of FIG. 2;
FIG. 4 is a schematic view of the arrangement of the conductive plastic drainage plate and a schematic view of a wire network;
fig. 5 is a schematic view showing that the conductive plastic drainage plates are respectively inserted from the pipe pieces of two tunnels in example 2.
Reference numerals: 1. a tunnel; 2. a duct piece; 21. a jack; 3. a communication channel; 4. a conductive plastic drain board; 5. a plastic film; 6. a power source; 7. a water filter pipe; 8. a vacuum pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
in this embodiment, the stratum is soft muddy soil with a water content of 50% -70% in a coastal region.
With reference to fig. 2 and 4, a construction process of a subway communication channel comprises the following construction steps:
marking an excavation boundary of a communication channel 3 on a segment 2 of a subway tunnel 1, and outwards expanding the excavation boundary for a certain distance to be used as a soft mud solidification treatment boundary, wherein the distance can be 1-2 m; a plurality of jacks 21 for inserting the conductive plastic drainage plates 4 are arranged in the range at equal intervals, and the interval between two adjacent rows of jacks 21 is 15-80 cm.
Inserting the conductive plastic drainage plate 4 obliquely upwards from the insertion hole 21, wherein the insertion end of the conductive plastic drainage plate 4 extends into the segment 2 of the other subway tunnel 1; the water outlet end of the conductive plastic drainage plate 4 is exposed out of the pipe piece 2; the gap between the water guide plastic plate and the insertion hole 21 is sealed by cement mortar or sealant.
The conductive plastic drainage board 4 and the arrangement mode thereof can adopt the plastic drainage board for deep drainage described in the patent with the application number of CN 201820329040.4; or CN201810197214.0, entitled a vacuum preloading soft foundation treatment system and method combined with electroosmosis technique.
Thirdly, the water outlet end of the conductive plastic drainage plate 4 is communicated with a strainer 7, and the strainer 7 is connected with a vacuum pump 8 (refer to fig. 3);
and step four, the water outlet end of the conductive plastic drainage plate 4 is connected with a wire network, and two adjacent rows of conductive plastic drainage plates 4 are respectively connected to the positive electrode and the negative electrode of the power supply 6 (refer to fig. 3).
Laying a plastic film 5 to cover all the conductive plastic drainage plates 4 and the water filter pipes 7, wherein the periphery of the plastic film 5 is hermetically connected to the segment 2 of the tunnel 1 and can be bonded and sealed by glue; preferably, the top edge of the plastic film 5 is pressed on the surface of the duct piece 2 by a pressing strip, two ends of the pressing strip are fixed on the duct piece 2 by expansion bolts, and the bottom of the pressing strip is provided with an elastic rubber strip.
Step six, switching on a power supply 6, starting a vacuum pump 8, discharging moisture in the excavation area of the communication channel 3 and a certain range around the excavation area from the conductive plastic drainage plate 4, and solidifying soft soil in the range;
seventhly, removing the plastic film 5, the wire network and the water filter pipes 7, and excavating and supporting the contact channel 3 in the consolidated soil body by adopting a mining method;
and step eight, after the reinforced concrete lining structure of the connection channel 3 is completed, cutting off the exposed conductive plastic drainage plate 4 on the duct piece 2 outside the range of the connection channel 3, and sealing the insertion hole 21 on the duct piece 2 by using concrete doped with an expanding agent.
Example 2: the construction process of the subway communication channel is different from that of the embodiment 1 in the following two points: firstly, as shown in fig. 5, the duct pieces 2 of two tunnels 1 are all provided with insertion holes 21, and the conductive plastic drainage plates 4 are inserted, and the insertion ends of the conductive plastic drainage plates 4 inserted from different tunnels 1 are mutually overlapped.
And secondly, after drainage consolidation, temporarily supporting the periphery of the communication channel 3 by adopting an anchor rod grouting process, and then excavating.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A construction process of a subway communication channel is characterized by comprising the following steps: the method comprises the following construction steps:
marking an excavation boundary of a communication channel (3) on a pipe piece (2) of a subway tunnel (1), expanding the excavation boundary for a certain distance to serve as a soft mud solidification treatment boundary, and arranging a plurality of jacks (21) for inserting conductive plastic drainage plates (4) in an equidistant array in the range;
inserting the conductive plastic drainage plate (4) from the insertion hole (21), wherein the insertion end of the conductive plastic drainage plate (4) extends into a duct piece (2) of another subway tunnel (1); the water outlet end of the conductive plastic drainage plate (4) is exposed out of the pipe piece (2);
thirdly, the water outlet end of the conductive plastic drainage plate (4) is communicated with a strainer (7), and the strainer (7) is connected with a vacuum pump (8);
step four, the water outlet end of the conductive plastic drainage plate (4) is connected with a wire network, and two adjacent rows of conductive plastic drainage plates (4) are respectively connected to the positive electrode and the negative electrode of the power supply (6);
laying a plastic film (5) to cover all the conductive plastic drainage plates (4) and the water filter pipes (7), wherein the periphery of the plastic film (5) is hermetically connected to the pipe piece (2) of the tunnel (1);
step six, switching on a power supply (6), starting a vacuum pump (8), discharging moisture in the excavation area of the communication channel (3) and a certain range around the excavation area from the conductive plastic drainage plate (4), and solidifying soft soil in the range;
seventhly, removing the plastic film (5), the wire network and the water filter pipe (7), and excavating and supporting the contact channel (3) in the consolidated soil body;
and step eight, after the reinforced concrete lining structure of the connection channel (3) is completed, closing the insertion holes (21) in the pipe pieces (2) outside the range of the connection channel (3).
2. The construction process of a subway communication channel as claimed in claim 1, wherein said construction process comprises the steps of: the soft mud solidification processing boundary is extended by 1-2m than the excavation boundary of the communication channel (3).
3. The construction process of a subway communication channel as claimed in claim 1, wherein said construction process comprises the steps of: the electric plastic drainage plate is obliquely and upwards inserted into the soil body, and one end in the soil body is higher than one end in the pipe piece (2).
4. The construction process of a subway communication channel as claimed in claim 1, wherein said construction process comprises the steps of: the distance between two adjacent rows of conductive plastic drainage plates (4) is 15-80 cm.
5. The construction process of a subway communication channel as claimed in claim 1, wherein said construction process comprises the steps of: the insertion holes (21) are formed in the duct pieces (2) of the two tunnels (1), the conductive plastic drainage plates (4) are inserted, and the insertion ends of the conductive plastic drainage plates (4) inserted from the different tunnels (1) are overlapped.
6. The construction process of a subway communication channel as claimed in claim 1, wherein said construction process comprises the steps of: and in the second step, after the conductive plastic drainage plate (4) is inserted, sealing the gap between the conductive plastic drainage plate (4) and the jack (21).
7. The construction process of a subway communication channel as claimed in claim 1, wherein said construction process comprises the steps of: in the fifth step, the periphery of the plastic film (5) is bonded on the pipe piece (2) of the tunnel (1).
8. The construction process of a subway communication channel as claimed in any one of claims 1-7, wherein said construction process comprises the steps of: after drainage and consolidation, temporary supporting is carried out on the periphery of the communication channel (3) by adopting an anchor rod grouting process, and then excavation is carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911424282.7A CN110985007A (en) | 2019-12-31 | 2019-12-31 | Construction process of subway communication channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911424282.7A CN110985007A (en) | 2019-12-31 | 2019-12-31 | Construction process of subway communication channel |
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| CN110985007A true CN110985007A (en) | 2020-04-10 |
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| CN201911424282.7A Pending CN110985007A (en) | 2019-12-31 | 2019-12-31 | Construction process of subway communication channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502733A (en) * | 2020-11-30 | 2021-03-16 | 中铁二十局集团有限公司 | Water-rich sand layer shield interval connection channel hole entering construction method |
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| CN1916362A (en) * | 2006-09-04 | 2007-02-21 | 上海隧道工程股份有限公司 | Construction method for tunnel contact passage in shield section of underground railway |
| CN102400713A (en) * | 2011-10-24 | 2012-04-04 | 广东华隧建设股份有限公司 | Method for auxiliary construction of water falling in tunnel by communicated channel |
| CN108396730A (en) * | 2018-03-10 | 2018-08-14 | 杭州渗源环境科技有限公司 | A kind of method for processing foundation of gradual energization |
| CN109235171A (en) * | 2018-09-20 | 2019-01-18 | 中铁二院工程集团有限责任公司 | Electric osmose inserts the precompressed of mould plate combined vacuum and handles soft base system |
| CN109252506A (en) * | 2018-08-17 | 2019-01-22 | 温州大学 | The system and technique of horizontal drainage vacuum preloading combined with electroosmosis reinforcing soft ground |
-
2019
- 2019-12-31 CN CN201911424282.7A patent/CN110985007A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1916362A (en) * | 2006-09-04 | 2007-02-21 | 上海隧道工程股份有限公司 | Construction method for tunnel contact passage in shield section of underground railway |
| CN102400713A (en) * | 2011-10-24 | 2012-04-04 | 广东华隧建设股份有限公司 | Method for auxiliary construction of water falling in tunnel by communicated channel |
| CN108396730A (en) * | 2018-03-10 | 2018-08-14 | 杭州渗源环境科技有限公司 | A kind of method for processing foundation of gradual energization |
| CN109252506A (en) * | 2018-08-17 | 2019-01-22 | 温州大学 | The system and technique of horizontal drainage vacuum preloading combined with electroosmosis reinforcing soft ground |
| CN109235171A (en) * | 2018-09-20 | 2019-01-18 | 中铁二院工程集团有限责任公司 | Electric osmose inserts the precompressed of mould plate combined vacuum and handles soft base system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502733A (en) * | 2020-11-30 | 2021-03-16 | 中铁二十局集团有限公司 | Water-rich sand layer shield interval connection channel hole entering construction method |
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