CN113931640B - Construction method for shield empty pushing and starting in mine tunnel - Google Patents
Construction method for shield empty pushing and starting in mine tunnel Download PDFInfo
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- CN113931640B CN113931640B CN202111204787.XA CN202111204787A CN113931640B CN 113931640 B CN113931640 B CN 113931640B CN 202111204787 A CN202111204787 A CN 202111204787A CN 113931640 B CN113931640 B CN 113931640B
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- shield
- pushing
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- empty
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- 238000010276 construction Methods 0.000 title claims abstract description 36
- 230000005641 tunneling Effects 0.000 claims abstract description 20
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims abstract description 14
- 244000046052 Phaseolus vulgaris Species 0.000 claims abstract description 14
- 239000004575 stone Substances 0.000 claims abstract description 14
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000009412 basement excavation Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
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- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- 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
-
- 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
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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
Abstract
The invention discloses a construction method for shield empty pushing and starting in a mine tunnel, wherein an empty pushing sliding rail is arranged in the tunnel before the empty pushing; an initial counter-force bracket is arranged at the tail of the shield; when the shield machine is in idle pushing, the idle pushing segments are assembled by the through seams block by block, and the shield machine moves forward to the assembling position of the negative ring; after the shield tail is in place, hanging off the empty pushing tube piece, setting a counter-force bracket, assembling the negative ring tube piece ring by ring to start, building an annular blocking wall on the tunnel to block the tunnel door before starting tunneling, pre-burying a grouting ball valve on the annular blocking wall, and reserving a hydraulic filling window; filling bean stones in an annular space between the negative ring segment and the undercut tunnel when tunneling is started; filling bean stones in front of the tail of each ring of negative ring pipe piece to the back of the pipe piece; after the starting is finished, installing a hanging ring on the vault of the undercut tunnel; and after the shield construction is completed, the empty pushing pipe piece, the negative ring pipe piece and the empty pushing slide rail are removed by using the hanging rings. The invention has simple construction, can reduce environmental pollution and can shorten the construction period.
Description
Technical Field
The invention relates to a construction method of urban rails, in particular to a construction method for shield empty pushing and starting in a mine tunnel.
Background
Along with the rapid promotion of urban mass transit in China, rail transit increasingly becomes one of effective and main ways for solving urban traffic jams, and in recent years, shield construction has gradually become a safe and rapid means in urban rail transit construction. Construction technologies such as shield launching, arrival and station passing are mature, but a construction method that a shield air pushing method is adopted to pass through a narrow and undercut tunnel with a two-lining formed and is launched in the tunnel is not common. The existing construction method is complex, high in construction difficulty, long in construction period and not environment-friendly. The construction method is simple, quick, safe and environment-friendly, and has great significance in order to effectively solve a series of problems of small space, high construction difficulty and the like in construction of a shield through a narrow space such as underground excavation and the like.
Disclosure of Invention
The invention provides a construction method for shield empty pushing and starting in a mine tunnel for solving the technical problems in the prior art, which is simple and convenient to construct, can reduce environmental pollution and can shorten the construction period.
The invention adopts the technical proposal for solving the technical problems in the prior art that: a construction method for shield empty pushing and starting in a mine tunnel adopts the following steps: 1) When the secondary lining structure of the undercut tunnel is constructed, arranging a plurality of embedded steel plates which are uniformly arranged along the length direction on the vault of the undercut tunnel; 2) Before the shield tunneling machine performs idle pushing, installing an idle pushing sliding rail which corresponds to the sliding rail of the shield bracket one by one on two sides of the arch bottom of the underground tunneling machine; an initial counter-force bracket fixed on a station bottom plate is arranged at the shield tail; 3) Air pushing is implemented, air pushing pipe pieces are assembled in front of the initial counter-force bracket and on the shield bracket sliding rail and the air pushing sliding rail in a joint-by-joint manner, and a pushing oil cylinder at the lower part of the shield machine takes the front end face of the air pushing pipe pieces as a support to push the shield body forwards until reaching the assembling position of the negative ring; after the empty pushing tube piece is separated from the shield tail, the empty pushing tube piece is stabilized in the undercut tunnel by adopting a wooden wedge and a wooden pier; 4) Pushing the shield machine and the matched equipment thereof to a set position along an empty pushing sliding rail, and then hanging off an empty pushing pipe piece at the tail of the shield; 5) The method comprises the steps of setting counterforce brackets which are fixed on the underground excavation tunnel and correspond to shield propulsion cylinders one by one; 6) Starting the assembly of the negative ring pipe pieces ring by ring, and arranging a stop block positioned in front of the cutter disc on the air pushing slide rail before the assembly of the final negative ring pipe piece; after the connection of the last ring of negative ring segments and the counter-force bracket is completed, building an annular blocking wall on the undercut tunnel to block the gap between the last ring of negative ring segments and the undercut tunnel, embedding a plurality of grouting ball valves with grouting pipes uniformly distributed along the annular direction on the annular blocking wall, and reserving a hydraulic filling window on the annular blocking wall; during initial tunneling, filling a bean stone for increasing friction force of a shield body in an annular space between the negative ring segment and the undercut tunnel; before each ring of negative ring pipe slice is separated from the shield tail, bean stones used for supporting the separated pipe slice are hydraulically filled to the back of the pipe slice through a reserved hydraulic filling window; 7) After the starting is finished, installing hanging rings on the pre-buried steel plate of the vault of the underground tunnel; and after the shield construction is completed, the empty pushing pipe piece, the negative ring pipe piece and the empty pushing slide rail are removed by using the hanging rings.
And 6), pre-paving the bean stones positioned at the lower part of the shield body and used for increasing the friction force of the shield body in advance before the shield machine is empty to push.
The grouting ball valves in the step 6) are separated by not more than 60 degrees.
And 1) the distance between the pre-buried steel plates of the arch crown of the underground tunnel is not more than 5 meters.
The invention has the advantages and positive effects that: before the shield machine enters the underground excavation method tunnel, after an empty pushing slide rail is arranged on a second lining of the underground excavation tunnel, then an empty pushing pipe piece is assembled on the empty pushing slide rail by adopting a through seam to provide counter force for the advance of the shield machine, and a pushing oil cylinder at the lower part of the shield machine is utilized to push the shield body forwards until reaching the assembling position of the negative ring; after the shield tunneling machine reaches the set position, a counterforce bracket is installed on the lining of the underground tunneling machine, counterforces are provided for the shield tunneling machine to start in the underground tunneling machine, the gap between the shield tunneling machine and the underground tunneling machine is filled with bean stones to enhance the stability of the shield tunneling machine, a blocking wall is built at the tail of the shield to prevent water leakage, the shield starting is completed, and after the shield tunneling machine penetrates through, the hanging ring on the top of the underground tunneling machine is utilized to dismantle the air pushing segment and the air pushing sliding rail which are used for air pushing, so that the pollution to the environment can be reduced. The invention solves a series of problems of large construction technical difficulty, high safety risk and the like faced by rapid empty pushing and starting of the shield in a narrow space, greatly improves the efficiency of empty pushing and starting construction of the underground tunnel, can repeatedly use the used auxiliary materials and tools, saves cost, reduces environmental pollution, accelerates construction progress and ensures construction safety.
Drawings
FIG. 1 is a schematic representation of step 1-2) of the present invention;
FIG. 2 is a schematic diagram of step 3) of the present invention;
FIG. 3 is a schematic representation of steps 5-6) of the present invention;
fig. 4 is a schematic cross-sectional view of fig. 3.
In the figure: 1. a primary support structure; 2. a secondary lining structure; 3. embedding a steel plate; 4. air pushing the sliding rail; 5. embedding a steel plate; 6. a shield body; 7. air pushing segment; 8. a thrust cylinder; 9. an initial counter-force bracket; 10. embedding a steel plate; 11. negative ring segments; 12. a hanging ring; 13. embedding a steel plate; 14. initiating a counterforce bracket; 15. wood piers; 16. an annular blocking wall; 17. bean particles; 18. and (5) a wooden wedge.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
referring to fig. 1 to 4, a construction method for shield construction air pushing and launching in a mine tunnel comprises the following steps:
1) After the primary support structure 1 of the undercut tunnel is constructed, a plurality of embedded steel plates 5 which are uniformly arranged are arranged on the vault of the undercut tunnel along the length direction during the construction of the secondary lining structure 2 and are used for installing hanging rings 12.
2) Before the shield machine is empty to push, an empty pushing sliding rail 4 corresponding to the sliding rail of the shield bracket one by one is respectively arranged on two sides of the arch bottom of the underground excavation tunnel, and an initial counter-force bracket 9 fixed on a station bottom plate is arranged at the tail of the shield.
The air pushing sliding rail 4 is a walking track of a shield body of the shield machine, and in order to fix the air pushing sliding rail 4, an embedded steel plate 3 needs to be arranged in advance, and the air pushing sliding rail 4 is fixedly connected with the embedded steel plate 3. The initial reaction bracket 9 is an initial reaction structure of the shield machine for air pushing, and in order to fix the initial reaction bracket 9, an embedded steel plate 10 needs to be provided in advance, and the initial reaction bracket 9 is fixedly connected with the embedded steel plate 10.
3) By air pushing
Assembling empty pushing segments 7 on the shield bracket sliding rail and the empty pushing sliding rail 4 block by block in front of the initial counter-force bracket 9, wherein a pushing cylinder 8 at the lower part of the shield machine takes the front end surface of the empty pushing segments 7 as a support to push the shield body 6 forwards until reaching the position of assembling the negative ring; after the air pushing segment 7 is separated from the shield tail, the air pushing segment is stabilized in the undercut tunnel by adopting the wooden wedges 18 and the wooden piers 15. A more specific description about the stabilization of the hollow pushing segment 7 at the tail of the pull-out shield is as follows, and after the hollow pushing segment 7 is pulled out of the tail shield, a wooden wedge 18 is installed at the gap between the segment and the two sides of the tunnel by the hidden digging method in time. In addition, two wooden piers 15 are respectively arranged at the front part and the rear part of the duct piece and used for filling up the gap between the duct piece and the two liners of the undercut tunnel so as to maintain the stability of the duct piece.
4) The shield machine and the matched equipment thereof are pushed to a set position along the air pushing slide rail 4, then the air pushing pipe piece 7 of the shield tail is lifted off, specifically, the main machine of the shield machine and the rear matched machine are pushed to the position of the set position of the shield tail end distance from the initial counter-force bracket embedded steel plate 13 along the air pushing slide rail 4, and then the two air pushing pipe pieces 7 of the shield tail are lifted out of the shield tail by using an assembling machine.
5) And the counter-force brackets 14 which are fixed on the undercut tunnels and are in one-to-one correspondence with the shield thrust cylinders are arranged. Specifically, the counterforce brackets 14 are arranged at the bottom, the top and the two sides of the tunnel, and the positions of the counterforce brackets 14 correspond to the groups of the propulsion cylinders 8 of the shield machine and are accurately positioned.
6) Starting by assembling negative ring segments 11 ring by ring
Before the last ring of negative ring pipe slice 11 is assembled, a stop block positioned in front of the cutter head is arranged on the idle pushing slide rail 4 to prevent the shield body 6 from moving forward and ensure the stability of the shield body when pushing the pipe slice.
After the connection of the last ring of negative ring pipe piece and the original counter-force bracket 14 is completed, building an annular blocking wall 16 on the undercut tunnel to block the gap between the last ring of negative ring pipe piece and the undercut tunnel, and embedding a plurality of grouting ball valves with grouting pipes uniformly distributed along the annular direction on the annular blocking wall 16; a blow-fill window is reserved on the annular block wall 16. The shield tunneling machine is started in a mine tunnel and is different from a conventional station, in order to prevent stratum water from flowing into the tunnel after the shield tunneling machine starts to break a gate, a gap between the last negative ring segment and the mine tunnel is commonly called a gate after the last negative ring segment is connected and fixed with a counter-force bracket is blocked by a mortar brick, grouting ball valves are embedded every other 60 degrees along the circumferential direction, and grouting ball valves are provided with grouting pipes for backfilling grouting after the negative ring segment 11 is backed after the shield is started. And a hydraulic filling window is reserved on the annular plugging wall 16 for hydraulic filling of the subsequent bean stones.
During initial tunneling, the annular space between the negative ring pipe slice 11 and the undercut tunnel is filled with the bean stones 17 for increasing the friction force of the shield body so as to increase the friction force of the shield body when the shield machine cutterhead rotates, reduce the torsion of the shield body and pre-spread the bean stones at the lower part of the shield body in advance before the shield machine is empty to push, thereby being convenient for construction; before each ring of negative ring pipe piece 11 is separated from the shield tail, the bean stones 17 used for supporting the separated negative ring pipe pieces are filled behind the negative ring pipe pieces through a reserved filling window on the annular plugging wall 16 in a blowing mode, so that the pipe pieces are prevented from sinking due to dead weight after being separated from the shield tail. The secondarily filled bean stones can be used as effective supports of the segments, the elevation of the negative ring segments of the originating segment is ensured to meet the design requirements, and the empty pushing and originating of the shield in the mine tunnel are completed.
7) After the starting is finished, installing a hanging ring 12 on the pre-buried steel plate 5 of the vault of the underground tunnel; after the shield construction is completed, the empty pushing tube piece 7, the negative ring tube piece 11 and the empty pushing sliding rail 4 are removed by using the hanging ring 12. The distance between the hanging rings 12 is not more than 5 m so as to ensure that the duct piece is convenient to dismantle, and therefore, the distance between the embedded steel plates 5 of the arch crown of the undercut tunnel is not more than 5 m.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are within the scope of the present invention.
Claims (4)
1. A construction method for shield empty pushing and starting in a mine tunnel is characterized by comprising the following steps:
1) When the secondary lining structure of the undercut tunnel is constructed, arranging a plurality of embedded steel plates which are uniformly arranged along the length direction on the vault of the undercut tunnel;
2) Before the shield tunneling machine performs idle pushing, installing an idle pushing sliding rail which corresponds to the sliding rail of the shield bracket one by one on two sides of the arch bottom of the underground tunneling machine; an initial counter-force bracket fixed on a station bottom plate is arranged at the shield tail;
3) By air pushing
Assembling empty pushing segments on the shield bracket sliding rail and the empty pushing sliding rail block by block in front of the initial counter-force bracket, wherein a pushing cylinder at the lower part of the shield machine takes the front end surface of the empty pushing segments as a support, and pushes the shield body forwards until reaching the position of assembling the negative ring; after the empty pushing tube piece is separated from the shield tail, the empty pushing tube piece is stabilized in the undercut tunnel by adopting a wooden wedge and a wooden pier;
4) Pushing the shield machine and the matched equipment thereof to a set position along an empty pushing sliding rail, and then hanging off an empty pushing pipe piece at the tail of the shield;
5) The method comprises the steps of setting counterforce brackets which are fixed on the underground excavation tunnel and correspond to shield propulsion cylinders one by one;
6) Ring-by-ring assembly negative ring pipe slice implementation starting
Before the last ring of negative ring pipe piece is assembled, a stop block positioned in front of the cutter disc is arranged on the idle pushing slide rail;
after the connection of the last ring of negative ring segments and the counter-force bracket is completed, building an annular blocking wall on the undercut tunnel to block the gap between the last ring of negative ring segments and the undercut tunnel, embedding a plurality of grouting ball valves with grouting pipes uniformly distributed along the annular direction on the annular blocking wall, and reserving a hydraulic filling window on the annular blocking wall;
during initial tunneling, filling a bean stone for increasing friction force of a shield body in an annular space between the negative ring segment and the undercut tunnel; before each ring of negative ring pipe slice is separated from the shield tail, bean stones used for supporting the separated pipe slice are hydraulically filled to the back of the pipe slice through a reserved hydraulic filling window;
7) After the starting is finished, installing hanging rings on the pre-buried steel plate of the vault of the underground tunnel; and after the shield construction is completed, the empty pushing pipe piece, the negative ring pipe piece and the empty pushing slide rail are removed by using the hanging rings.
2. The construction method for empty pushing and starting of shield in mine tunnel according to claim 1, wherein in the step 6), the stone particles for increasing friction force of the shield are pre-laid in advance before the empty pushing of the shield machine.
3. The method of construction of shield excavation and initiation in a mine tunnel of claim 1, wherein in step 6), the grouting ball valves are separated by no more than 60 °.
4. The construction method for shield empty pushing and launching in a mine tunnel according to claim 1, wherein the distance between the pre-buried steel plates of the vault of the underground tunnel in the step 1) is not more than 5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111204787.XA CN113931640B (en) | 2021-10-15 | 2021-10-15 | Construction method for shield empty pushing and starting in mine tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111204787.XA CN113931640B (en) | 2021-10-15 | 2021-10-15 | Construction method for shield empty pushing and starting in mine tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN113931640A CN113931640A (en) | 2022-01-14 |
| CN113931640B true CN113931640B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111204787.XA Active CN113931640B (en) | 2021-10-15 | 2021-10-15 | Construction method for shield empty pushing and starting in mine tunnel |
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| Country | Link |
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| CN (1) | CN113931640B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116049969B (en) * | 2023-04-03 | 2023-06-20 | 中国建筑第六工程局有限公司 | Method for selecting point positions of universal wedge-shaped duct pieces |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653229A (en) * | 2015-01-27 | 2015-05-27 | 粤水电轨道交通建设有限公司 | Shielding sliding shoe curvilinear pushing-up hole-passing construction method |
| CN106223963A (en) * | 2016-08-05 | 2016-12-14 | 中国水利水电第十四工程局有限公司 | A kind of shield machine air pushing construction method by subsurface excavation method tunnel |
| CN107725060A (en) * | 2017-11-13 | 2018-02-23 | 中铁十二局集团有限公司 | Constructing metro tunnel method containing complicated geological and without shield launching place |
| CN109057810A (en) * | 2018-08-30 | 2018-12-21 | 中国水利水电第十四工程局有限公司 | A kind of shield sky pushes away construction method and auxiliary device by Tunneling by mining method |
| CN109236305A (en) * | 2018-10-26 | 2019-01-18 | 中铁第勘察设计院集团有限公司 | Shield sky is pushed away through bored tunnel and the secondary construction method and its structure originated |
| CN110080789A (en) * | 2019-06-06 | 2019-08-02 | 周霄 | A kind of shield sky, which pushes away, spells section of jurisdiction construction |
| CN110486025A (en) * | 2019-08-27 | 2019-11-22 | 中铁隧道局集团有限公司 | Sky pushing device and method are originated in large-diameter shield hole |
| CN110761797A (en) * | 2018-07-26 | 2020-02-07 | 中交第三航务工程局有限公司 | Construction method for shield air-pushing through mine tunnel |
-
2021
- 2021-10-15 CN CN202111204787.XA patent/CN113931640B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104653229A (en) * | 2015-01-27 | 2015-05-27 | 粤水电轨道交通建设有限公司 | Shielding sliding shoe curvilinear pushing-up hole-passing construction method |
| CN106223963A (en) * | 2016-08-05 | 2016-12-14 | 中国水利水电第十四工程局有限公司 | A kind of shield machine air pushing construction method by subsurface excavation method tunnel |
| CN107725060A (en) * | 2017-11-13 | 2018-02-23 | 中铁十二局集团有限公司 | Constructing metro tunnel method containing complicated geological and without shield launching place |
| CN110761797A (en) * | 2018-07-26 | 2020-02-07 | 中交第三航务工程局有限公司 | Construction method for shield air-pushing through mine tunnel |
| CN109057810A (en) * | 2018-08-30 | 2018-12-21 | 中国水利水电第十四工程局有限公司 | A kind of shield sky pushes away construction method and auxiliary device by Tunneling by mining method |
| CN109236305A (en) * | 2018-10-26 | 2019-01-18 | 中铁第勘察设计院集团有限公司 | Shield sky is pushed away through bored tunnel and the secondary construction method and its structure originated |
| CN110080789A (en) * | 2019-06-06 | 2019-08-02 | 周霄 | A kind of shield sky, which pushes away, spells section of jurisdiction construction |
| CN110486025A (en) * | 2019-08-27 | 2019-11-22 | 中铁隧道局集团有限公司 | Sky pushing device and method are originated in large-diameter shield hole |
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| Publication number | Publication date |
|---|---|
| CN113931640A (en) | 2022-01-14 |
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