CN109707399B - Tunnel exit supporting structure and construction method thereof - Google Patents
Tunnel exit supporting structure and construction method thereof Download PDFInfo
- Publication number
- CN109707399B CN109707399B CN201910135787.5A CN201910135787A CN109707399B CN 109707399 B CN109707399 B CN 109707399B CN 201910135787 A CN201910135787 A CN 201910135787A CN 109707399 B CN109707399 B CN 109707399B
- Authority
- CN
- China
- Prior art keywords
- tunnel
- support
- small pilot
- construction
- upper step
- 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.)
- Active
Links
- 238000010276 construction Methods 0.000 title claims abstract description 70
- 239000011435 rock Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000011378 shotcrete Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 230000008520 organization Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Landscapes
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a tunnel exit supporting structure and a construction method thereof, wherein the supporting structure comprises an upper step and a lower step which are arranged at a tunnel opening, a connecting slope is connected between the upper step and the lower step, a small pilot tunnel is arranged on the upper step, a temporary support is arranged around the small pilot tunnel, an advanced support, a system anchor rod, a foot locking anchor rod and an initial support are used for reinforcing surrounding rocks of the tunnel, and a big-pipe-shed guide wall and a big-pipe shed are arranged outside the tunnel opening from the outside to the inside after the small pilot tunnel exits; the construction method is to construct adjacent hole sections by adopting a step method; digging an advanced small pilot tunnel at one side of the upper step, and applying advanced support, system anchor rods, foot locking anchor rods, primary support and temporary support to penetrate the small pilot tunnel to a tunnel portal; constructing a greenhouse guide wall, drilling holes in the greenhouse guide wall, and arranging a greenhouse advanced support; and excavating a small pilot tunnel on the other side of the upper step of the support in the tunnel to the tunnel opening, removing the temporary support of the small pilot tunnel, and excavating the lower step of the support to the tunnel opening.
Description
Technical Field
The invention relates to the technical field of railway engineering construction, in particular to a tunnel exit supporting structure and a construction method thereof.
Background
With the development of railway construction in China, more and more tunnel projects appear in mountain railways, and the mountain areas in southwest are dangerous in topography, so that more tunnel openings are often on steep side slopes, and the tunnel is immediately adjacent to a bridge. And the difficulty of constructing the tunnel with the high and steep side slope in the mountain area to the hole is high, the hole construction site is difficult to arrange, and construction mechanical personnel are difficult to enter the hole for construction. When the tunnel length is short, one-way tunneling from one end with better tunnel entrance condition to the other end can be selected, and when the tunnel is longer, reverse construction to the tunnel entrance with worse condition after the transverse tunnel or the inclined shaft enters the positive tunnel can be considered. Both the two methods face the hole-out construction, as the hole opening section is often buried in shallow depth and surrounding rock is broken, and the tunnel is excavated with a large section, accidents such as collapse inside and outside the hole are easily caused when the hole-out construction is carried out, and the collapse construction is difficult to process, the investment is increased, the construction period is delayed, and huge losses are brought to the tunnel construction. Therefore, the adoption of the method for ensuring the safety and the effectiveness of the tunnel exit construction is a problem which needs to be solved at present.
At present, the tunnel hole-leaving construction method is less in research, along with the accelerated development of railway construction in China, more tunnels face the hole-leaving construction risk, and more tunnels have huge economic losses in the hole-leaving construction. How to make the protection of tunnel exit construction, not only the safety of tunnel construction is ensured, but also an entrance to a cave construction platform can be built, and a safe, quick, economic and reasonable construction method is sought.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a tunnel exit supporting structure and a construction method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
a tunnel exit supporting structure comprises an upper step and a lower step which are arranged at a tunnel opening, wherein a connecting slope is connected between the upper step and the lower step, and a small pilot tunnel is arranged on the upper step; the support structure also comprises temporary supports arranged around the small pilot tunnel, advanced supports, system anchor rods, foot locking anchor rods and primary supports which are arranged around the tunnel opening and used for reinforcing surrounding rocks around the tunnel, and a big pipe shed guide wall and a big pipe shed which are applied from outside the tunnel opening to inside the tunnel after the small pilot tunnel exits.
According to the invention, the surrounding rock of the shallow buried broken section of the tunnel opening is reinforced by adopting the mode that the small pilot tunnel with the upper step is advanced to go out and is applied as the protection of the opening and the greenhouse, so that the construction safety of the tunnel going out is ensured. The invention can reduce the risks of investment increase, construction period delay and the like caused by tunnel collapse when the tunnel exits, and indirectly saves the tunnel engineering investment and construction period; the invention can effectively solve the problems that the high and steep tunnel portal of the tunnel can not build a construction operation platform and construction personnel and equipment are difficult to transport, and ensures the construction safety of the tunnel portal. The invention provides scientific basis for the design of the tunnel exit on the high and steep side slope, enhances the safety and reliability of the tunnel exit construction, and realizes economy, rationality, safety and high efficiency to the greatest extent.
Preferably, the inclination of the connecting slope is smaller than or equal to 1/3, so that the slope connecting the upper step and the lower step is smooth enough, and the transportation organization of construction personnel and construction machinery is facilitated.
Preferably, the temporary support comprises a steel section steel frame shotcrete support.
Preferably, the advance support comprises an advance catheter.
Preferably, the supporting structure further comprises a drainage system and a side elevation slope protection, wherein the drainage system and the side elevation slope protection are arranged at the tunnel portal, and the tunnel excavation supporting is guaranteed to be completely stable.
Preferably, the side elevation slope protection comprises an anchor rod frame beam.
The invention also discloses a construction method of the tunnel exit support structure, which comprises the following steps:
step one: when the tunnel is constructed to the section adjacent to the tunnel opening, the construction method is adjusted to a step method, and the upper step and the lower step are connected through a connecting slope;
step two: excavating an advanced small pilot tunnel on one side of an upper step of a tunnel, performing advanced support, system anchor rods, foot locking anchor rods, primary support and temporary support after each cycle of excavating the small pilot tunnel, and excavating the next cycle of the small pilot tunnel after the support is completed, and penetrating the small pilot tunnel to a tunnel opening according to the working procedure;
step three: constructing personnel and mechanically arranging a hole construction site through a small pilot tunnel, then constructing a big pipe shed guide wall, drilling holes in the big pipe shed guide wall, and drilling a big pipe shed advanced support and grouting to strengthen the shallow buried section of the hole to crush surrounding rock;
step four: after the tunnel mouth protection construction and the large pipe shed reinforcement are completed, excavating a small pilot tunnel on the other side of the upper step from the inside of the tunnel to the tunnel mouth, removing the temporary support of the small pilot tunnel after the excavation support of the upper step is completed, excavating the lower step of the support to the tunnel mouth, and completing the tunnel exit construction.
The construction method provides scientific basis for the design of the high-steep slope tunnel exit construction, the tunnel exit is advanced through the upper step pilot tunnel, and then the tunnel entrance protection and the large pipe shed are implemented to strengthen the surrounding rock of the broken section of the shallow buried tunnel entrance, so that the problem of difficult transportation of constructors and equipment is solved, the tunnel exit construction safety is ensured, and the collapse risk of the tunnel exit construction is reduced.
Preferably, the third step is to apply the drainage system and the side slope protection before applying the guide wall of the greenhouse, so as to ensure the complete stability of the tunnel excavation support.
Compared with the prior art, the supporting structure has the beneficial effects that:
according to the invention, the surrounding rock of the shallow buried broken section of the tunnel opening is reinforced by adopting the mode that the small pilot tunnel with the upper step is advanced to go out and is applied as the protection of the opening and the greenhouse, so that the construction safety of the tunnel going out is ensured. The invention can reduce the risks of investment increase, construction period delay and the like caused by tunnel collapse when the tunnel exits, and indirectly saves the tunnel engineering investment and construction period; the invention can effectively solve the problems that the high and steep tunnel portal of the tunnel can not build a construction operation platform and construction personnel and equipment are difficult to transport, and ensures the construction safety of the tunnel portal. The invention provides scientific basis for the design of the tunnel exit on the high and steep side slope, enhances the safety and reliability of the tunnel exit construction, and realizes economy, rationality, safety and high efficiency to the greatest extent.
Compared with the prior art, the construction method of the supporting structure has the beneficial effects that:
the construction method provides scientific basis for the design of the high-steep slope tunnel exit construction, the tunnel exit is advanced through the upper step pilot tunnel, and then the tunnel entrance protection and the large pipe shed are implemented to strengthen the surrounding rock of the broken section of the shallow buried tunnel entrance, so that the problem of difficult transportation of constructors and equipment is solved, the tunnel exit construction safety is ensured, and the collapse risk of the tunnel exit construction is reduced.
Description of the drawings:
fig. 1 is a longitudinal section view of a tunnel exit support structure according to the present invention.
Fig. 2 is a sectional view A-A in fig. 1.
Fig. 3 is a B-B cross-sectional view in fig. 1.
The marks in the figure: 1-advanced support, 2-system anchor rods, 3-foot locking anchor rods, 4-primary support, 5-secondary lining, 6-temporary support, 7-upper steps, 8-lower steps, 9-small pilot holes, 10-greenhouse guide walls, 11-greenhouse, 12-connection slopes, 13-anchor rod frame beams and 14-ground wires.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1-3, a tunnel exit support structure comprises an upper step 7 and a lower step 8 which are arranged at a tunnel opening, wherein a connection slope 12 is connected between the upper step 7 and the lower step 8, the inclination of the connection slope 12 is less than or equal to 1/3, the slope is ensured to be smooth enough, and the construction machine and the transportation organization of construction machines are facilitated.
A small pilot tunnel 9 is arranged on one side of the upper step 7, the temporary support 6 is arranged in time after the small pilot tunnel 9 is excavated, and the temporary support 6 comprises a steel section steel frame sprayed concrete support; and the advance support 1, the system anchor rods 2, the foot locking anchor rods 3 and the primary support 4 which are arranged around the tunnel portal and used for reinforcing surrounding rocks around the tunnel are arranged, wherein the advance support 1 comprises an advance small guide pipe, the surrounding rocks around the tunnel are reinforced, and the construction safety of the pilot tunnel is ensured. The small pilot tunnel 9 with the upper step is firstly excavated to the tunnel portal to provide a channel for personnel and mechanical exit.
The supporting structure also comprises a big pipe shed guide wall 10 and a big pipe shed 11 which are applied from outside to inside of the tunnel opening after the small pilot tunnel 9 is out of the tunnel, and the surrounding rock of the opening section is pre-reinforced in advance. The supporting structure further comprises a drainage system arranged at the tunnel portal and a side elevation slope protection, wherein the side elevation slope protection comprises an anchor rod frame beam 13, and a ground line is shown as 14.
Example 2
As shown in fig. 1 to 3, a construction method of a tunnel exit support structure includes the following steps:
step one: when the tunnel is constructed to the section adjacent to the tunnel opening, the construction method is adjusted to a step method, the upper step 7 and the lower step 8 are connected through the connecting slope 12, the length of the upper step and the lower step is prolonged as much as possible, the connecting slope 12 connecting the upper step and the lower step is ensured to be smooth enough, and the transportation organization of constructors and construction machinery is facilitated;
step two: an advanced small pilot tunnel 9 is excavated on one side of a step 7 on a tunnel, after each cycle of excavation of the small pilot tunnel 9, supporting measures such as an advance support 1, a system anchor rod 2, a foot locking anchor rod 3, an initial support 4, a secondary lining 5, a temporary support 6 and the like are applied, the safety and stability of the excavation and the support of the small pilot tunnel are ensured, the next cycle of excavation of the small pilot tunnel 9 is carried out after the completion of the support, and the small pilot tunnel 9 is penetrated to a tunnel opening according to the working procedure and used as a passage for transporting personnel and mechanical equipment out of the tunnel;
step three: the personnel and the mechanical arrangement of the hole construction site are organized through the small pilot tunnel 9, a hole drainage system and side elevation slope protection are implemented, then a big pipe shed guide wall 10 is implemented, holes are drilled in the big pipe shed guide wall 10, and the big pipe shed 11 is arranged for advanced support and grouting to strengthen broken surrounding rocks of a shallow buried section of the hole;
step four: after the tunnel mouth protection construction and the reinforcement of the big pipe shed 11 are completed, excavating and supporting the small pilot tunnel at the other side of the upper step 7 in the tunnel to the tunnel mouth, removing the temporary support 6 of the small pilot tunnel after the excavation and supporting of the upper step 7 are completed, excavating and supporting the lower step 8 to the tunnel mouth, and completing the tunnel exit construction.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be covered by the scope of the appended claims.
Claims (1)
1. The tunnel exit supporting structure is characterized by comprising an upper step (7) and a lower step (8) which are arranged at a tunnel opening, wherein a connecting slope (12) is connected between the upper step (7) and the lower step (8), and a small pilot tunnel (9) is arranged on the upper step (7); the support structure also comprises a temporary support (6) arranged around the small pilot tunnel (9), an advance support (1), a system anchor rod (2), a foot locking anchor rod (3) and an initial support (4) which are arranged around the tunnel opening and used for reinforcing surrounding rocks around the tunnel, and a greenhouse guide wall (10) and a greenhouse (11) which are arranged outside the tunnel opening and are arranged in the tunnel after the small pilot tunnel (9) exits from the tunnel opening; the inclination of the connecting slope (12) is less than or equal to 1/3; the temporary support (6) comprises a section steel frame shotcrete support; the advance support (1) comprises an advance small duct; the supporting structure also comprises a drainage system arranged at the tunnel portal and a side elevation slope protection; the side elevation slope protection comprises an anchor rod frame beam (13);
the construction of the tunnel exit support structure comprises the following steps:
step one: when the tunnel is constructed to the section adjacent to the tunnel opening, the construction method is adjusted to a step method, and the upper step (7) and the lower step (8) are connected through a connecting slope (12);
step two: excavating a small pilot tunnel (9) on one side of an upper step (7) of a tunnel, performing advanced support (1), a system anchor rod (2), a foot locking anchor rod (3), an initial support (4) and a temporary support (6) after each cycle of excavating the small pilot tunnel (9), and excavating the next cycle of the small pilot tunnel (9) after the support is completed, and penetrating the small pilot tunnel (9) to a tunnel opening according to the procedure;
step three: the method comprises the steps of organizing personnel and mechanically arranging a hole construction site through a small pilot tunnel (9), then constructing a big pipe shed guide wall (10), drilling holes in the big pipe shed guide wall (10), constructing a big pipe shed (11) for advanced support, grouting to strengthen broken surrounding rocks at a shallow buried section of the hole, and constructing a hole drainage intercepting system and a side elevation slope protection before constructing the big pipe shed guide wall (10);
step four: after the tunnel mouth protection construction and the reinforcement of the big pipe shed (11) are completed, excavating and supporting an upper step (7) from the inside of the tunnel and a small pilot tunnel at the other side to the tunnel mouth, dismantling a small pilot tunnel temporary support (6) after the upper step (7) is excavated and supported, excavating and supporting a lower step (8) to the tunnel mouth, and completing tunnel exit construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910135787.5A CN109707399B (en) | 2019-02-21 | 2019-02-21 | Tunnel exit supporting structure and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910135787.5A CN109707399B (en) | 2019-02-21 | 2019-02-21 | Tunnel exit supporting structure and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109707399A CN109707399A (en) | 2019-05-03 |
| CN109707399B true CN109707399B (en) | 2024-01-30 |
Family
ID=66263733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910135787.5A Active CN109707399B (en) | 2019-02-21 | 2019-02-21 | Tunnel exit supporting structure and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109707399B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110030001B (en) * | 2019-05-30 | 2020-06-30 | 广西大学 | Construction method for mountain tunnel to go out of hole |
| CN110645003B (en) * | 2019-10-17 | 2021-09-21 | 中铁二局集团有限公司 | Completely weathered granite bias steep slope tunnel entry construction method |
| CN111119913B (en) * | 2020-02-24 | 2024-05-17 | 中铁二院工程集团有限责任公司 | TBM escaping treatment method in tunnel construction and tunnel construction structure |
| CN111594229B (en) * | 2020-05-28 | 2021-08-20 | 中建七局交通建设有限公司 | Construction method for multi-arch tunnel entrance under shallow-buried water-rich geological condition |
| CN113047846A (en) * | 2021-03-10 | 2021-06-29 | 北京永创众信建筑设计有限公司 | Construction method for tunneling tunnel through slope |
| CN113482630B (en) * | 2021-08-06 | 2024-01-12 | 中铁二局第四工程有限公司 | Advanced pilot pit construction method applied to small-clear-distance double-hole tunnel |
| CN114673181B (en) * | 2022-05-31 | 2022-09-06 | 中国铁路设计集团有限公司 | Construction method of interval tunnel at bridge-tunnel connection position near existing railway |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10280862A (en) * | 1997-04-04 | 1998-10-20 | Shimizu Corp | Construction method for tunnel junction part |
| CN101864960A (en) * | 2010-05-17 | 2010-10-20 | 中铁二十局集团有限公司 | Carst region double-arch road tunnel construction method |
| CN102226399A (en) * | 2011-06-02 | 2011-10-26 | 中铁二院工程集团有限责任公司 | Soft rock four-line large-span tunnel three-bench cable-bracing excavation construction method |
| CN102305077A (en) * | 2011-09-23 | 2012-01-04 | 中南大学 | Rapid construction method of large-section multi-arc tunnel |
| CN104879131A (en) * | 2015-05-06 | 2015-09-02 | 中国电建集团华东勘测设计研究院有限公司 | Large-span tunnel excavation method for upper soft and lower hard compound strata |
| CN104929649A (en) * | 2015-06-17 | 2015-09-23 | 大连市市政设计研究院有限责任公司 | Tunnel transverse cave-to-master cave top brushing construction method and top brushing structure |
| CN105156121A (en) * | 2015-10-08 | 2015-12-16 | 中铁二十五局集团第五工程有限公司 | Construction method of large-cross section loess tunnel cave entering shallow buried section |
| CN107060771A (en) * | 2016-12-28 | 2017-08-18 | 广东省长大公路工程有限公司 | Middle short tunnel is unidirectionally appeared excavation method |
| CN206860179U (en) * | 2017-07-11 | 2018-01-09 | 北京市市政三建设工程有限责任公司 | A kind of tunnel construction mid-board |
| CN108222947A (en) * | 2017-12-26 | 2018-06-29 | 长安大学 | A kind of construction method of two benching tunnelling method of super-span tunnel top bar CD normal direction conversion |
| CN108374674A (en) * | 2018-01-08 | 2018-08-07 | 济南城建集团有限公司 | Six pilot tunnels, 12 step Underground Space Excavation method for protecting support |
| CN108798679A (en) * | 2018-06-11 | 2018-11-13 | 中铁二局第工程有限公司 | Steel tube shed goes out cavity construction method in shallow embedding single-track railway tunnel hole |
| CN209523756U (en) * | 2019-02-21 | 2019-10-22 | 中铁二院工程集团有限责任公司 | A kind of tunnel outlet support structure |
-
2019
- 2019-02-21 CN CN201910135787.5A patent/CN109707399B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10280862A (en) * | 1997-04-04 | 1998-10-20 | Shimizu Corp | Construction method for tunnel junction part |
| CN101864960A (en) * | 2010-05-17 | 2010-10-20 | 中铁二十局集团有限公司 | Carst region double-arch road tunnel construction method |
| CN102226399A (en) * | 2011-06-02 | 2011-10-26 | 中铁二院工程集团有限责任公司 | Soft rock four-line large-span tunnel three-bench cable-bracing excavation construction method |
| CN102305077A (en) * | 2011-09-23 | 2012-01-04 | 中南大学 | Rapid construction method of large-section multi-arc tunnel |
| CN104879131A (en) * | 2015-05-06 | 2015-09-02 | 中国电建集团华东勘测设计研究院有限公司 | Large-span tunnel excavation method for upper soft and lower hard compound strata |
| CN104929649A (en) * | 2015-06-17 | 2015-09-23 | 大连市市政设计研究院有限责任公司 | Tunnel transverse cave-to-master cave top brushing construction method and top brushing structure |
| CN105156121A (en) * | 2015-10-08 | 2015-12-16 | 中铁二十五局集团第五工程有限公司 | Construction method of large-cross section loess tunnel cave entering shallow buried section |
| CN107060771A (en) * | 2016-12-28 | 2017-08-18 | 广东省长大公路工程有限公司 | Middle short tunnel is unidirectionally appeared excavation method |
| CN206860179U (en) * | 2017-07-11 | 2018-01-09 | 北京市市政三建设工程有限责任公司 | A kind of tunnel construction mid-board |
| CN108222947A (en) * | 2017-12-26 | 2018-06-29 | 长安大学 | A kind of construction method of two benching tunnelling method of super-span tunnel top bar CD normal direction conversion |
| CN108374674A (en) * | 2018-01-08 | 2018-08-07 | 济南城建集团有限公司 | Six pilot tunnels, 12 step Underground Space Excavation method for protecting support |
| CN108798679A (en) * | 2018-06-11 | 2018-11-13 | 中铁二局第工程有限公司 | Steel tube shed goes out cavity construction method in shallow embedding single-track railway tunnel hole |
| CN209523756U (en) * | 2019-02-21 | 2019-10-22 | 中铁二院工程集团有限责任公司 | A kind of tunnel outlet support structure |
Non-Patent Citations (1)
| Title |
|---|
| 公路山岭隧道单向出洞技术研究;周满兵;《安徽建筑》;第24卷(第2期);第78-80页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109707399A (en) | 2019-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109707399B (en) | Tunnel exit supporting structure and construction method thereof | |
| CN101614125B (en) | Construction method of V-level surrounding rock tunnel | |
| CN101864963B (en) | Large-section loess tunnel construction method | |
| CN104453921B (en) | A kind of Soft Rock Tunnel Excavation construction technology | |
| CN110017144B (en) | Loess tunnel three-step construction method considering substrate reinforcement treatment | |
| CN101963060B (en) | Tunnel construction method based on steel tube arch-rib supporting structure | |
| CN106869969A (en) | A kind of excavation supporting construction method of soft rock large section tunnel | |
| CN201991017U (en) | Subway large-span station body structure based on arch cover method construction forming | |
| CN110700841B (en) | Double-side-wall guide pit type excavation method for tunnel excavation | |
| CN108035733A (en) | A kind of perpendicular support partial excavation method of rock matter large section tunnel steelframe dike combination | |
| CN211006756U (en) | Interface structure of open cut station and large-span duplex arch buried tunnel | |
| CN108518229A (en) | Large deformation weak broken wall rock outsized section tunnel excavation supporting structure and construction method | |
| CN208236427U (en) | Large deformation weak broken wall rock outsized section tunnel excavation supporting structure | |
| CN104632227A (en) | Subway station excavation technology of single-layer beam arch structure | |
| CN107575237A (en) | A kind of subsurface excavation method is combined the construction method of construction subway station with shield method | |
| CN109339800A (en) | A kind of Rapid Construction of Tunnels method in the connected section of bridge tunnel | |
| CN204851266U (en) | Secretly dig shaft structure directly over station | |
| CN108374674B (en) | Six pilot tunnels, 12 step Underground Space Excavation method for protecting support | |
| CN111396062A (en) | Non-span-reduction construction method for super-large section loess tunnel through operation railway under close proximity | |
| CN115977103A (en) | Supporting structure for span of track section to be built on open-cut tunnel and construction method thereof | |
| CN209523756U (en) | A kind of tunnel outlet support structure | |
| CN112065451B (en) | Underground excavation method for underground passage | |
| CN114876469A (en) | High-speed super-large section tunnel excavation construction method | |
| CN108868826B (en) | Construction method of ribbed primary support structure of tunnel water burst section | |
| CN206419043U (en) | A kind of tunnel changes arch construction supporting structure |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |