CN106894825A - A kind of hidden digging structure of underground interchange offspur tunnel - Google Patents
A kind of hidden digging structure of underground interchange offspur tunnel Download PDFInfo
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- CN106894825A CN106894825A CN201710165984.2A CN201710165984A CN106894825A CN 106894825 A CN106894825 A CN 106894825A CN 201710165984 A CN201710165984 A CN 201710165984A CN 106894825 A CN106894825 A CN 106894825A
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- 230000007704 transition Effects 0.000 claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims description 41
- 238000009499 grossing Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 7
- 230000035772 mutation Effects 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present invention relates to a kind of hidden digging structure of underground interchange offspur tunnel, including the transition of at least one-level that becomes larger of section width and the Large span tunnel maximum section section of afterbody transition connection, multiple-arch tunnel section, small-clear-distance tunnel section and separate tunnel section；The centre of the small-clear-distance tunnel section and separate tunnel section is provided with the reserved interval pillar that the tunnel diverges；The mid-board that the tunnel diverges is provided with the middle of the multiple-arch tunnel section；Small-clear-distance tunnel section one end after fork is connected with multiple-arch tunnel section；Multiple-arch tunnel section one end after fork is connected with Large span tunnel maximum section section；The other end of the separate tunnel section correspondence connection small-clear-distance tunnel section after fork.Compared with prior art, the present invention passes through various tunnel cross-section structures conversion and transition, realize the fork in underground interchange tunnel, are particularly well-suited to the design and application of Urban Underground grade separation road.
Description
Technical field
The present invention relates to the road tunnel structure-design technique field in municipal works technical field, and in particular to a kind of ground
The hidden digging structure of lower cervical spine offspur tunnel.
Background technology
With the development of urban construction, the functional requirement more and more higher of Impacts Evaluation of Urban Tunnel, particularly in downtown area,
Limited by land used and traffic above-ground, road tunnel can only be set to meet the demand of social development.Meanwhile, must take into consideration again many
The traffic diverging in individual direction and linking, the form of underground interchange are arisen at the historic moment.When conventional underground interchange is designed, if using open cut
Engineering difficulty will be substantially reduced, and when the influence of the factors such as traffic above-ground, it is necessary to during using boring construction, will cause applying for underground interchange
Work difficulty is greatly increased or even cannot realized, the present invention proposes hidden digging structure when underground interchange offspur tunnel is constructed, and its is big
Engineering difficulty is reduced greatly, the growth requirement of future city underground space development is more beneficial for.
The content of the invention
For the shortcoming or deficiency of above-mentioned prior art, the invention provides a kind of underground interchange offspur tunnel tunneling knot
Structure, to solve the tunneling problem of Urban Underground grade separation offspur tunnel.
In order to solve the above technical problems, the present invention has following composition：
A kind of hidden digging structure of the public offspur tunnel in underground, including the transition of at least one-level that becomes larger of section width and
Large span tunnel maximum section section, small-clear-distance tunnel section and separate tunnel section that afterbody transition is connected；It is described small net
Centre away from tunnel construction sections and separate tunnel section is provided with the reserved interval pillar that the tunnel diverges；It is described small net after fork
It is connected with Large span tunnel maximum section section away from tunnel construction sections one end；Separate tunnel section correspondence connection after fork is described small net
Away from the other end of tunnel construction sections.
The hidden digging structure of the public offspur tunnel in underground also includes the multiple-arch tunnel section after fork, the multiple-arch tunnel section
Be arranged between Large span tunnel maximum section section and small-clear-distance tunnel section, be additionally provided with the middle of the multiple-arch tunnel section with
The middle wall construction of the reserved interval pillar connection.
The thickness of the middle wall construction and reserved interval pillar is set in continuous increase, the maximum gauge of the middle wall construction
Hold slip level with both hands with the minimum thickness of the reserved interval pillar in end.
The section width of the Large span tunnel maximum section section is total with middle wall construction more than or equal to multiple-arch tunnel section
The both sides side wall of width, the Large span tunnel maximum section section and multiple-arch tunnel section uses same radius to ensure that structure is put down
The reasonable conversion of slip and construction technology.
Single hole section width of the multiple-arch tunnel section after the fork is set to identical or differs.
The transition includes the first transition, the second transition, the 3rd transition and the 4th transition, the first gradual change
The section width of section, the second transition, the 3rd transition and the 4th transition in gradual change increase mode set, it is described it is adjacent gradually
The side for becoming section is in smoothing junction, and opposite side is attached by the way of section width mutation.
The section width excursion of the adjacent transition is 1.5 m -3.5 m.
The section width of the Large span tunnel maximum section section is more than or equal to small-clear-distance tunnel section and reserved middle rock
The both sides side wall of the overall width of post, the Large span tunnel maximum section section and small-clear-distance tunnel section uses same radius with true
Structure-preserving reasonable conversion in smoothing junction and construction technology.
The separate tunnel section uses same radius and is connected with ensuring that structure is smooth with the both sides side wall of small-clear-distance tunnel section
Connect the reasonable conversion with construction technology.
Compared with prior art, the present invention has the following technical effect that：
1）The present invention by transition, Large span tunnel maximum section section and（Or）Multiple-arch tunnel section, small-clear-distance tunnel section and separation
The combination and transition of various tunnel cross-sections such as formula tunnel construction sections are realized；
2）Road tunnel main line first passes through transition and is increasing to Large span tunnel maximum section section through multiple gradual change, described big across tunnel
Road maximum section section directly carries out drop-over with multiple-arch tunnel, so the single hole section structure of main line can be separated into the disconnected of diplopore
Face structure；
3）Incorporation engineering geological conditions, to size and the position of transition, Large span tunnel maximum section section and multiple-arch tunnel section
Can suitably be adjusted, such as preferably, the original dimension of middle wall construction can use smaller value to geological conditions；When geological conditions is poor, can
The position integrated regulation that grade separation is diverged is to geological conditions compared with benefit；
4）The thickness of wall construction will gradually can so be divided using the gradual change value set-up mode for gradually increasing in multiple-arch tunnel of the present invention
Two tunnel spacing increases after trouble, gradually realize separating；
5）The present invention enters small-clear-distance tunnel section, and tunnel should try one's best and use the Horizontal Curve of wide-angle after underground interchange fork,
So that tunnel is separated as early as possible, reduce the risk of small-clear-distance tunnel section construction, spacing increases to desired value when tunnel（As three times tunnel is wide
Angle value, according to geological conditions, the distance can suitably change）When, that is, connect separate tunnel section, now two designs in tunnel and
Construction can be independent, so as to be truly realized the fork transition of underground interchange；
6）When engineering geological condition is preferably or when underground interchange number of track-lines is less, can directly by the maximum section Duan Yu little of Large span tunnel
Clear-distance tunnel section drop-over, reduces the species of tunnel cross-section section, reduces the complexity of construction.
Conversion and transition that the present invention passes through various tunnel cross-section structures, realize the fork in underground interchange tunnel, especially
Suitable for the design and application of Urban Underground grade separation road.
Brief description of the drawings
Fig. 1：The hidden digging structure schematic diagram one of underground interchange offspur tunnel of the present invention；
Fig. 2：The sectional schematic diagram of adjacent transition junction in the present invention；
Fig. 3：The sectional schematic diagram of Large span tunnel maximum section section and small-clear-distance tunnel section junction in the present invention；
Fig. 4：The hidden digging structure schematic diagram two of underground interchange offspur tunnel of the present invention；
Fig. 5：The sectional schematic diagram of Large span tunnel maximum section section and multiple-arch tunnel section junction in the present invention；
Fig. 6：The schematic three dimensional views of middle wall construction in the present invention.
Specific embodiment
The technique effect of design of the invention, concrete structure and generation is described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Embodiment one
As shown in figure 1, when underground interchange offspur tunnel driveway number is less or during preferable geological conditions, underground interchange of the present invention point
Branch off the hidden digging structure in tunnel, including the transition of at least one-level that becomes larger of section width and the connection of afterbody transition
Large span tunnel maximum section section 5, small-clear-distance tunnel section 7 and separate tunnel section 8；The small-clear-distance tunnel section 7 and separation
The centre of formula tunnel construction sections 8 is provided with the reserved interval pillar 10 that the tunnel diverges；Small-clear-distance tunnel section 7 after fork
One end is connected with Large span tunnel maximum section section 5；The correspondence connection small-clear-distance tunnel section 7 of separate tunnel section 8 after fork
The other end.
Due to number of track-lines is less or geological conditions preferably, Large span tunnel maximum section section 5 and small-clear-distance tunnel section 7 direct phases
Even, the species of tunnel cross-section is reduced, reduces the complexity of construction；And reserved interval pillar is made using wide-angle horizontal curve
10 are constantly thickened, and are finally connected with separate tunnel 8, and the separate tunnel section 8 is adopted with the both sides side wall of small-clear-distance tunnel section 7
It is in smoothing junction with same radius.The reserved interval pillar 10 is original state rock mass, and its thickness is in ever-increasing state.The present invention
By the combination of various tunnel cross-sections such as transition, Large span tunnel maximum section section, small-clear-distance tunnel section and separate tunnel section
Realized with transition, on the basis of side, opposite side side wall so can ensure that fork tunnel to the adjacent tunnel section using in smoothing junction
Road structure side wall it is smooth.
The transition includes the first transition 1, the second transition 2, the 3rd transition 3 and the 4th transition 4, first
The section width of transition 1, the second transition 2, the 3rd transition 3 and the 4th transition 4 increases mode and sets in gradual change, institute
The side for stating adjacent transition is in smoothing junction, and opposite side is attached by the way of section width mutation.
As shown in Fig. 2 on the basis of the side of the first transition 1 and the second transition 2, side wall radius uses identical chi
Very little, to ensure the smooth of offspur tunnel structure side wall, the opposite side of 1 and second transition of the first transition 2 is prominent using size
The mode of change, the varying width of adjacent transition can be controlled by 1.5m ~ 3.5m, and the type of attachment of other adjacent transitions is with such
Push away, i.e. the section width gradual change of the first transition 1, the second transition 2, the 3rd transition 3 and the opposite side of the 4th transition 4 increases
It is big to Large span tunnel maximum section section 5, zigzag change is then shown as in plane.
The present invention is preferably four sections of gradual change segment structures, and during practice of construction, it is appropriate to carry out according to actual needs
Increase or decrease.The setting quantity of the transition determines according to the size of Large span tunnel maximum section section 5, described adjacent
The section width excursion of transition can be controlled according to 1.5 m -2.5 m.
As shown in figure 3, when driveway number is less or geological conditions is preferable, adjacent tunnel section uses the connected mode of Fig. 1, institute
State Large span tunnel maximum section section 5 and small-clear-distance tunnel section 7 be directly connected to, the Large span tunnel maximum section section 5 it is disconnected
Face width is more than or equal to small-clear-distance tunnel section 7 and the overall width of reserved interval pillar 10, the Large span tunnel maximum section
The both sides side wall of section 5 and small-clear-distance tunnel section 7 is in smoothing junction, to ensure the smooth of tunnel-side.
Embodiment two
As shown in figure 4, the present embodiment is with the difference of embodiment one, the underground interchange offspur tunnel hidden digging structure is additionally provided with
Multiple-arch tunnel section 6, the mid-board that the tunnel diverges is provided with the middle of the multiple-arch tunnel section；The small interval tunnel after fork
Road section one end is connected with multiple-arch tunnel section；Multiple-arch tunnel section one end after fork is connected with Large span tunnel maximum section section.
Specifically, the multiple-arch tunnel section 6 is arranged between the Large span tunnel maximum section section 5 and small-clear-distance tunnel section 7, institute
State and be additionally provided with the middle wall construction 9 being connected with the reserved interval pillar 10, the thickness of the middle wall construction 9 in the middle of multiple-arch tunnel section 6
Degree using the gradual change value set-up mode that gradually increases, so can gradually by fork after two tunnel spacing increases, gradually realize point
From the set-up mode of other structures is identical with embodiment one in the present embodiment.The middle wall construction 9 and reserved interval pillar 10
Thickness is set in continuous increase, the minimum thickness end of the maximum gauge end of the middle wall construction 9 and the reserved interval pillar 10
It is in smoothing junction.
As shown in figure 5, the section width of the Large span tunnel maximum section section 5 is more than or equal to the multiple-arch tunnel 6 Hes of section
The both sides side wall of the overall width of middle wall construction 9, the Large span tunnel maximum section section 5 and multiple-arch tunnel section 6 is in smoothing junction,
To ensure the smooth of side wall；Single hole section width of the multiple-arch tunnel section 6 after the fork is set to identical or differs, and this sets
The mode of putting can determine according to actual driveway number.
As shown in fig. 6, the middle wall construction 9 is wall in Varying-thickness, the most thin middle wall section 91 by geological conditions and it is big across
The dimension synthesis of tunnel maximum section section determine, gradually transit to it is most thick in wall section 92, its size is according to connected small net
Thickness away from tunnel construction sections 7 and reserved interval pillar 10 determines that final gradual change forms the special-shaped middle wall knot that thickness is continually changing
Structure 9, the thickness of wall construction 9, so can gradually by after fork using the gradual change value set-up mode for gradually increasing in the present embodiment
Two tunnel spacing increases, gradually realize separating.
The present embodiment passes through transition, Large span tunnel maximum section section 5, multiple-arch tunnel section 6, small-clear-distance tunnel section 7 and divides
Combination and transition from various tunnel cross-sections such as formula tunnel construction sections 8 realize that it is multiple gradually in warp that road tunnel main line first passes through transition
Change increases to Large span tunnel maximum section section 5, and the Large span tunnel maximum section section 5 directly carries out drop-over with multiple-arch tunnel section 6,
The single hole section structure of main line can be so separated into the section structure of diplopore.Incorporation engineering geological conditions, to transition, greatly
The size and position of across tunnel maximum section section 5 and multiple-arch tunnel section 6 can be adjusted suitably, and such as geological conditions is preferable, in
The desirable smaller value of the original dimension of wall construction 9；When geological conditions is poor, the position integrated regulation that grade separation can be diverged to geology bar
Part is compared with benefit.
In sum, the hidden digging structure of the underground interchange offspur tunnel that the present invention is provided, by various tunnel cross-section sizes
Conversion and connection transition, smoothly realize the fork of offspur tunnel hidden digging structure, be the dark of Urban Underground grade separation offspur tunnel
Excavation construction provides safe and reliable mentality of designing, is particularly well-suited to the design of Urban Underground interchange offspur tunnel and answers
With.
The above embodiments are merely illustrative of the technical solutions of the present invention and it is non-limiting, reference only to preferred embodiment to this hair
It is bright to be described in detail.It will be understood by those within the art that, technical scheme can be modified
Or equivalent, without deviating from the spirit and scope of technical solution of the present invention, all should cover in scope of the presently claimed invention.
Claims (9)
1. a kind of hidden digging structure of underground interchange offspur tunnel, it is characterised in that
The Large span tunnel of transition and afterbody the transition connection of at least one-level become larger including section width is maximum
Section section（5）, small-clear-distance tunnel section（7）And separate tunnel section（8）；
The small-clear-distance tunnel section（7）With separate tunnel section（8）Centre be provided with by the tunnel diverge reserved middle rock
Post（10）；
Small-clear-distance tunnel section after fork（7）One end and Large span tunnel maximum section section（5）Connection；
Separate tunnel section after fork（8）The correspondence connection small-clear-distance tunnel section（7）The other end.
2. the hidden digging structure of underground interchange offspur tunnel according to claim 1, it is characterised in that after also including fork
Multiple-arch tunnel section（6）, the multiple-arch tunnel section（6）It is arranged on the Large span tunnel maximum section section（5）With the small interval tunnel
Road section（7）Between, the multiple-arch tunnel section（6）Centre is additionally provided with and the reserved interval pillar（10）The middle wall construction of connection
（9）.
3. the hidden digging structure of underground interchange offspur tunnel according to claim 2, it is characterised in that the middle wall construction
（9）With reserved interval pillar（10）Thickness set in continuous increase, the middle wall construction（9）Maximum gauge end it is pre- with described
Stay interval pillar（10）Minimum thickness hold slip level with both hands.
4. the hidden digging structure of the underground interchange offspur tunnel according to Claims 2 or 3, it is characterised in that described big across tunnel
Road maximum section section（5）Section width more than or equal to the multiple-arch tunnel section（6）With middle wall construction（9）Overall width, it is described
Large span tunnel maximum section section（5）With multiple-arch tunnel section（6）Both sides side wall use same radius with ensure structure smooth
Connection and the reasonable conversion of construction technology.
5. the hidden digging structure of underground interchange offspur tunnel according to claim 4, it is characterised in that the company after the fork
Arch tunnel construction sections（6）Single hole section width be set to identical or differ.
6. the hidden digging structure of the underground interchange offspur tunnel according to claim 1 or 2 or 3, it is characterised in that the gradual change
Section includes the first transition（1）, the second transition（2）, the 3rd transition（3）And the 4th transition（4）, the first transition
（1）, the second transition（2）, the 3rd transition（3）And the 4th transition（4）Section width in gradual change increase mode set,
The side wall side of the adjacent transition uses same radius with smooth connection, and opposite side is entered by the way of section width mutation
Row connection.
7. the hidden digging structure of underground interchange offspur tunnel according to claim 5, it is characterised in that the adjacent transition
Section width excursion be 1.5 m -3.5 m.
8. the hidden digging structure of the underground interchange offspur tunnel according to claim 1 or 2 or 3 or 5 or 7, it is characterised in that institute
State Large span tunnel maximum section section（5）Section width more than or equal to the small-clear-distance tunnel section（7）With reserved interval pillar
（10）Overall width, Large span tunnel maximum section section（5）With small-clear-distance tunnel section（7）Both sides side wall using identical
Radius is ensuring structure reasonable conversion in smoothing junction and construction technology.
9. the hidden digging structure of the underground interchange offspur tunnel according to claim 1 or 2 or 3 or 5 or 7, it is characterised in that institute
State separate tunnel section（8）With small-clear-distance tunnel section（7）Both sides side wall use same radius with ensure structure it is in smoothing junction and
The reasonable conversion of construction technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165984.2A CN106894825A (en) | 2017-03-20 | 2017-03-20 | A kind of hidden digging structure of underground interchange offspur tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710165984.2A CN106894825A (en) | 2017-03-20 | 2017-03-20 | A kind of hidden digging structure of underground interchange offspur tunnel |
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| CN106894825A true CN106894825A (en) | 2017-06-27 |
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| CN201710165984.2A Pending CN106894825A (en) | 2017-03-20 | 2017-03-20 | A kind of hidden digging structure of underground interchange offspur tunnel |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701193A (en) * | 2017-11-28 | 2018-02-16 | 中铁十二局集团有限公司 | A kind of breaking surrounding rock separate tunnel intersection gradual change section constructing method |
| CN108951865A (en) * | 2018-09-19 | 2018-12-07 | 北京城建集团有限责任公司 | A kind of Large-Span Continuous domes, top plate supporting system and its construction method |
| CN109162750A (en) * | 2018-10-26 | 2019-01-08 | 重庆大学 | A kind of underground urban traffic tunnel flue gas control method based on transversal ventilation |
| CN110259457A (en) * | 2019-05-22 | 2019-09-20 | 云南建投第四建设有限公司 | A kind of fork crosses the construction method of section large section tunnel |
| CN110306986A (en) * | 2019-05-09 | 2019-10-08 | 深圳市综合交通设计研究院有限公司 | A kind of anti-cut construction method of underground interchange fork node Tunneling by mining method |
| CN111188629A (en) * | 2020-01-02 | 2020-05-22 | 中交第二航务工程局有限公司 | Construction method for sudden change of tunnel bifurcation section and expanding excavation |
| CN111794756A (en) * | 2020-07-16 | 2020-10-20 | 四川省交通勘察设计研究院有限公司 | Construction method for multi-arch connection small-static-distance tunnel of mountain highway |
| CN111810187A (en) * | 2020-07-20 | 2020-10-23 | 中国路桥工程有限责任公司 | Urban non-center pilot tunnel bifurcation tunnel turning construction method |
| CN113431588A (en) * | 2021-07-30 | 2021-09-24 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
| CN115288705A (en) * | 2022-08-09 | 2022-11-04 | 云南建投第四建设有限公司 | Construction method for transitional part of intersection section of bifurcation tunnel and ultra-large span |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107701193A (en) * | 2017-11-28 | 2018-02-16 | 中铁十二局集团有限公司 | A kind of breaking surrounding rock separate tunnel intersection gradual change section constructing method |
| CN107701193B (en) * | 2017-11-28 | 2019-04-05 | 中铁十二局集团有限公司 | A kind of breaking surrounding rock separate tunnel intersection gradual change section constructing method |
| CN108951865A (en) * | 2018-09-19 | 2018-12-07 | 北京城建集团有限责任公司 | A kind of Large-Span Continuous domes, top plate supporting system and its construction method |
| CN109162750A (en) * | 2018-10-26 | 2019-01-08 | 重庆大学 | A kind of underground urban traffic tunnel flue gas control method based on transversal ventilation |
| CN110306986A (en) * | 2019-05-09 | 2019-10-08 | 深圳市综合交通设计研究院有限公司 | A kind of anti-cut construction method of underground interchange fork node Tunneling by mining method |
| CN110259457A (en) * | 2019-05-22 | 2019-09-20 | 云南建投第四建设有限公司 | A kind of fork crosses the construction method of section large section tunnel |
| CN111188629A (en) * | 2020-01-02 | 2020-05-22 | 中交第二航务工程局有限公司 | Construction method for sudden change of tunnel bifurcation section and expanding excavation |
| CN111188629B (en) * | 2020-01-02 | 2021-07-02 | 中交第二航务工程局有限公司 | Construction method for sudden change of tunnel bifurcation section and expanding excavation |
| CN111794756A (en) * | 2020-07-16 | 2020-10-20 | 四川省交通勘察设计研究院有限公司 | Construction method for multi-arch connection small-static-distance tunnel of mountain highway |
| CN111810187A (en) * | 2020-07-20 | 2020-10-23 | 中国路桥工程有限责任公司 | Urban non-center pilot tunnel bifurcation tunnel turning construction method |
| CN113431588A (en) * | 2021-07-30 | 2021-09-24 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
| CN113431588B (en) * | 2021-07-30 | 2022-07-22 | 中铁十四局集团第三工程有限公司 | Construction method for branch tunnel |
| CN115288705A (en) * | 2022-08-09 | 2022-11-04 | 云南建投第四建设有限公司 | Construction method for transitional part of intersection section of bifurcation tunnel and ultra-large span |
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Application publication date: 20170627 |