CN114562277B - A variable cross-section tunnel construction method - Google Patents
A variable cross-section tunnel construction method Download PDFInfo
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- CN114562277B CN114562277B CN202210211699.0A CN202210211699A CN114562277B CN 114562277 B CN114562277 B CN 114562277B CN 202210211699 A CN202210211699 A CN 202210211699A CN 114562277 B CN114562277 B CN 114562277B
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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
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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
- E21D9/01—Methods or apparatus for enlarging or restoring the cross-section of tunnels, e.g. by restoring the floor to its original level
-
- 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
- E21D9/06—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 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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0692—Cutter drive shields
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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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
- E21D9/087—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
- E21D9/0873—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines the shield being provided with devices for lining the tunnel, e.g. shuttering
-
- 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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- 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
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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)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a construction method of a variable-section tunnel, which comprises the steps of constructing a first section of tunnel through a first tunneling machine, arranging a first receiving well for receiving the first tunneling machine at the end position of the first section of tunnel, disassembling and replacing the first tunneling machine into a second tunneling machine in the first receiving well, enabling construction section sizes of the first tunneling machine and the second tunneling machine to be different, converting the first receiving well into an originating well of the second tunneling machine, constructing a second section of tunnel through the second tunneling machine, and arranging a second receiving well for receiving the second tunneling machine at the end position of the second section of tunnel. The functions of receiving and starting can be realized through the same working well, so that the purposes of reducing construction cost and improving construction efficiency are achieved. In addition, the construction of different tunnel sections can be realized, and compared with the traditional integrated switching construction equipment, the construction cost can be effectively reduced, and the construction mode is simple and easy to operate.
Description
Technical Field
The invention relates to the technical field of underground construction, in particular to a variable section tunnel construction method.
Background
When the subway section tunnel and the platform structure are constructed, the section tunnel is constructed by a common shield method, the platform is constructed by a common open cut method, but the open cut method has great influence on the surrounding environment, and if the platform is constructed by adopting a non-excavation pipe jacking mode, the problem can be avoided.
In the prior art, shield-pipe jacking integrated machine equipment exists, but tunnels constructed by the shield-pipe jacking integrated machine equipment are the same in section size, however, the size difference between the subway section tunnel and the platform end face is large, and therefore the shield-pipe jacking integrated machine equipment is difficult to apply to the working condition of reducing. In addition, the existing shield-pipe jacking all-in-one machine is essentially provided with two systems at the same time to realize the switching of two functions, but the equipment is high in cost, and in the jacking process, the front shield equipment needs to be jacked together, so that the jacking force is increased, and the operation is inconvenient.
Disclosure of Invention
The invention aims to provide a variable section tunnel construction method which can realize construction of different sections of a multi-section tunnel.
In order to solve the technical problems, the invention provides the following technical scheme:
a variable section tunnel construction method comprises the following steps:
Constructing a first section of tunnel through a first heading machine;
setting a first receiving well for receiving the first heading machine at the end position of the first section of tunnel;
In the first receiving well, the first heading machine is disassembled and replaced by a second heading machine, and the construction section sizes of the first heading machine and the second heading machine are different;
Converting the first receiving well into an originating well of the second heading machine;
constructing a second section of tunnel through the second heading machine;
and setting a second receiving well for receiving the second heading machine at the end position of the second section of tunnel.
Preferably, the first heading machine and the second heading machine may be different types of heading machines or different types of heading machines with cutterheads having different diameters.
Preferably, the first heading machine is disassembled and replaced by a second heading machine, and the method specifically comprises the steps of replacing a cutterhead of the first heading machine with a cutterhead with a diameter different from that of the cutterhead, so as to disassemble and replace the first heading machine into the second heading machine, or disassembling and replacing the first heading machine into the second heading machine capable of constructing the section shape different from that of the second heading machine.
The method comprises the steps of removing a front shield, a middle shield and a shell of a shield tail of the shield machine, a segment erector and a shield jack, reserving a shield cutter head, a main driving structure and a screw conveyor, installing a front end shell at the front end of the shield machine, installing a rear end shell at the rear end of the shield machine, and expanding the shield cutter head into a large-diameter pipe jacking cutter head.
Preferably, the first receiving well is converted into an originating well of the second heading machine, and the originating well specifically comprises a jacking pipe counter-force frame, a jacking pipe steel plate and jacking pipe jack equipment which are arranged in the first receiving well, and a receiving base and a guide rail structure in the first receiving well are adjusted for originating of the jacking pipe machine.
The method comprises the steps of removing an outer shell of the pipe jacking machine, adjusting a pipe jacking cutter to be a small-diameter shield cutter, and installing shells of a front shield, a middle shield and a shield tail of the shield machine, a segment erector and a shield jack.
Preferably, the first receiving well is converted into an originating well of the second heading machine, and the method specifically comprises the steps of installing a shield reaction frame and a shield steel plate at the position of a pipe jacking hole outlet, and adjusting a pipe jacking receiving base and a guide rail structure in the first receiving well for originating of the shield machine.
Preferably, two tunnel lines each including a station are constructed, and the two stations are dug by a dug method to form one large-section station.
Preferably, the method for performing the dig-enlarging on the two stations by adopting the dig method specifically comprises the following steps:
Drilling, grouting and reinforcing a part of the platform needing to be dug;
Mechanical station breaking needs to be expanded and (5) digging a pipe jacking segment of the part.
Preferably, after the pipe-jacking segment is broken, the primary support is constructed in a mode of grid arch frames, shotcrete, connecting ribs and reinforcing steel meshes, and the waterproof layer and the secondary lining are constructed after the expansion and the excavation.
Compared with the prior art, the technical scheme has the following advantages:
The invention provides a construction method of a variable-section tunnel, which comprises the steps of constructing a first section of tunnel through a first tunneling machine, arranging a first receiving well for receiving the first tunneling machine at the end position of the first section of tunnel, disassembling and replacing the first tunneling machine into a second tunneling machine in the first receiving well, enabling construction section sizes of the first tunneling machine and the second tunneling machine to be different, converting the first receiving well into an originating well of the second tunneling machine, constructing a second section of tunnel through the second tunneling machine, and arranging a second receiving well for receiving the second tunneling machine at the end position of the second section of tunnel. The functions of receiving and starting can be realized through the same working well, so that the purposes of reducing construction cost and improving construction efficiency are achieved. In addition, the construction of different tunnel sections can be realized, and compared with the traditional integrated switching construction equipment, the construction cost can be effectively reduced, and the construction mode is simple and easy to operate.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for constructing a variable section tunnel according to an embodiment of the present invention;
fig. 2 is a schematic construction diagram of two subway section tunnels and a station platform tunnel part;
FIG. 3 is a schematic structural view of a shield tunneling machine;
FIG. 4 is a schematic view of a push bench;
FIG. 5 is a layout of the converted push bench and push initiation well;
FIG. 6 is a layout of the converted shield tunneling machine and shield originating well;
Fig. 7 is a cross-sectional view of the double-line station platform tunnel expansion construction.
The reference numerals are as follows:
1 is a shield tunneling machine cutterhead, 2 is a front shield, 3 is a middle shield, 4 is a shield tail, 5 is a screw conveyor, 6 is a shield jack, 7 is a segment erector, 8 is a main driving structure, 9 is a front end housing, 10 is a rear end housing, 11 is a pipe jacking pipe joint, 12 is a pipe jacking jack, 13 is a top iron, 14 is a pipe jacking machine cutterhead, 15 is a push frame, 16 is a pipe jacking steel plate, 17 is a shield tunneling machine receiving base and guide rail structure, 18 is a shield receiving well, 19 is a pipe jacking reaction frame, 20 is a pipe jacking machine receiving base and guide rail structure, 21 is a negative ring segment, 22 is a shield reaction frame, and 23 is a shield steel plate.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings.
In the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than those herein described, and those skilled in the art may readily devise numerous other arrangements that do not depart from the spirit of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.
The invention provides a variable section tunnel construction method, which is shown in figure 1 and comprises the following steps:
And S100, constructing a first section of tunnel through a first heading machine.
And S200, setting a first receiving well for receiving the first heading machine at the end position of the first section of tunnel.
S300, in the first receiving well, the first heading machine is detached and replaced by the second heading machine. The first heading machine and the second heading machine can be different types of heading machines or the same type of heading machines with cutterheads of different diameters. For example, the first heading machine may be a shield tunneling machine, the second heading machine may be a pipe push bench, and the diameters of the cutter heads of the two may be different. The construction modes of small-diameter shield to large-diameter pipe jacking, large-diameter pipe jacking to small-diameter shield, large-diameter shield to small-diameter pipe jacking, small-diameter pipe jacking to large-diameter shield and the like, and even the conversion of the shield to the pipe jacking with the same section size can be realized. Besides, the first heading machine can be detached and replaced by a second heading machine which can be constructed into different section shapes, such as the conversion of round shield-rectangular pipe jacking equipment with different sizes or the same size.
S400, converting the first receiving well into an originating well of a second heading machine. The functions of receiving and starting can be realized through the same working well, so that the purposes of reducing the construction cost and improving the construction efficiency are achieved.
S500, constructing a second section of tunnel through a second heading machine.
And S600, setting a second receiving well for receiving a second heading machine at the end position of the second section of tunnel. When the number of construction sections exceeds two, the steps can be repeated to achieve the purpose of continuous construction.
The tunnel construction method provided by the embodiment of the invention can be applied to subway tunnel construction and station platform integrated non-excavation construction, and comprises construction from a subway section shield tunnel to a station platform top pipe tunnel and construction from a subway station platform top pipe tunnel to a section shield tunnel, wherein the section size of the station platform top pipe tunnel I is larger than the section size of the section shield tunnel II as shown in figure 2.
1. Construction of a subway section shield tunnel to a station platform top pipe tunnel comprises the following steps:
Arranging a shield receiving well 18 at the end position of the shield segment a, backfilling a structural bottom plate of the receiving well by adopting C35 concrete, and finishing the reinforcement of the soil body of the receiving portal;
Performing shield attitude re-checking measurement, arranging a shield machine receiving base and a guide rail structure 17 in a shield receiving well 18 according to the elevation of a receiving tunnel portal and the central elevation of the shield machine, and performing elevation re-checking after the shield machine is installed;
Chiseling a shield receiving tunnel portal, and installing a receiving tunnel portal waterproof device;
Constructing the section tunnel through a shield tunneling machine;
After the construction of the shield segment a is completed, the shield machine is received through a shield receiving well, and the shield machine is disassembled and replaced into a pipe jacking machine, as shown in fig. 3 and 4, the method specifically comprises the steps of removing unnecessary parts of the pipe jacking machine such as a front shield 2, a middle shield 3 and a shield tail 4 of the shield machine, a pipe segment erector 7, a shield jack 12 and the like, and reserving the needed parts of the pipe jacking machine such as a shield machine cutterhead 1, a main driving structure 8, a screw conveyor 5 and the like;
The shield receiving base and the guide rail structure 17 are adjusted to be used for starting a pipe jacking machine, a front end shell 9 is arranged at the front end of the shield machine, a rear end shell 10 is arranged at the rear end of the shield machine, and the shield machine cutterhead 1 is expanded into a large-diameter pipe jacking machine cutterhead 14;
converting the shield receiving well 18 into a pipe-jacking initiation well, as shown in fig. 5, specifically includes:
A top pipe reaction frame 19 is arranged at a hole outlet A of the shield tunneling machine, a top pipe steel plate 16 is padded behind the top pipe reaction frame 19, the top pipe steel plate 16 is guaranteed to be attached to the surface of a well wall of a top pipe starting well, otherwise, high-strength concrete is poured in a gap to ensure that the stress of a back wall is uniform during top pipe construction, and the top pipe reaction frame 19 not only has enough compressive strength, but also can be adjusted in size according to actual needs so as to adapt to shield receiving wells with different sizes;
Installing a pipe jacking jack 12 to provide advancing power for pipe jacking construction, wherein a hydraulic pump station for a pipe jacking machine adopts a hydraulic pump station of an original shield machine, debugging the whole machine after the installation is finished, and entering the next working procedure after the complete machine is qualified;
installing a sealing curtain cloth rubber plate of the tunnel portal, cleaning the pre-buried bolt holes at the opening of the hole, installing an initial hole curtain cloth rubber plate, a circular plate and the like;
after the precipitation construction outside the pit, arranging horizontal exploratory holes in the range of the opening, checking the reinforcing body quality and the condition of flowing water and sand with errors, ensuring that the exploratory holes are good, no water and sediment flow out, and starting the pipe jacking to start the opening to break, wherein the opening is chiseled from top to bottom;
Thixotropic slurry is injected, and the thixotropic slurry is injected to the outer wall of the pipe joint through a reserved grouting hole of the pipe joint, so that a complete slurry sleeve is formed on the outer wall of the pipe joint 11 of the jacking pipe;
And installing a thrust frame 15, hoisting the jacking pipe section 11, installing a jacking iron 13, and starting jacking construction on the jacking pipe section b after debugging the pipe jacking machine.
2. Construction from a subway station platform pipe jacking tunnel to an interval shield tunnel comprises the following steps:
a pipe jacking receiving well is arranged at the end position of the pipe jacking section b;
in the pipe jacking receiving well, a pipe jacking machine receiving base and a guide rail structure 20 are arranged for the pipe jacking machine to go out of the tunnel;
Constructing a platform through a pipe jacking machine;
after the construction of the top pipe section b is completed and the top pipe bench is discharged to reach a top pipe receiving well, the top pipe bench is disassembled and replaced into a shield machine, as shown in fig. 3 and 4, and the method specifically comprises the steps of disassembling an outer shell of the top pipe bench, adjusting a top pipe cutter 14 into a small-diameter shield cutter 1, and installing a front shield 2, a middle shield 3, a shell of a shield tail 4, a segment erector 7, a shield jack 6 and the like of the shield machine;
Converting the pipe jacking receiving well into a shield starting well, and adjusting the pipe jacking machine receiving base and the guide rail structure 20 to be used for starting of the shield machine;
stratum reinforcement of a shield starting hole;
The shield starting hole is chiseled and the hole sealing device is installed;
An originating guide rail is arranged in the originating tunnel opening of the shield, and a shield reaction frame 22 and a shield steel plate 23 are arranged at the position B of the outlet tunnel opening of the jacking pipe, as shown in FIG. 6;
The negative ring segment 21 is installed in preparation for starting the shield tunneling construction.
The pipe jacking construction and the shield construction are common non-excavation construction technologies in the construction of facilities, and are widely used for laying various tunnels and underground pipelines. The pushing device of the shield tunneling machine is arranged in front, so that the shield tunneling machine is flexible, can perform long-distance construction, can have a certain curve radius, and the push bench is opposite, the push force of the push bench increases along with the increase of the construction distance, and the push force of the shield tunneling is theoretically unchanged along with the distance, so that a tunnel is constructed in a section by adopting a shield tunneling method during subway engineering construction. The invention can realize the expansion construction from the small-size section tunnel to the large-section platform by utilizing the advantages of two non-excavation technologies of shield construction and pipe jacking construction, can finish the adjustment and conversion of equipment by utilizing the prior receiving well structure after the construction of the previous section is finished, and uses the prior receiving well for the originating well of the next section of engineering.
In one embodiment of the present invention, two tunnel lines each including a platform may be constructed by the above construction method, and as shown in fig. 7, the two lines are preferably parallel to each other, and may be constructed sequentially or simultaneously, and after the construction is completed, the two platforms are dug by a dug method to form a large-section platform. The construction process comprises the following steps:
Drilling, grouting and reinforcing a part III to be dug at the platform, and selecting support measures such as advance small-conduit grouting, a pipe curtain method and the like according to the specific spacing of double lines and the quality of surrounding soil mass, so that the construction safety is ensured;
the mechanical breaking platform needs to expand the pipe segment of digging the part, in order to avoid the influence on the structural stability of the pipe segment in the mechanical breaking process, the chiseling sequence is carried out from top to bottom, and concrete is chiseled off and reinforcing steel bars are cut off in a partitioning mode.
After the pipe-jacking segment is broken, the primary support is constructed in a mode of grid arch centering, shotcrete, connecting ribs and reinforcing steel meshes, and waterproof layer and secondary lining construction are carried out after the expansion and excavation.
According to the embodiment, the soil body between the two formed platform tunnels is supported and excavated in a hidden mode, so that the construction process of the large-section station platform is formed, the influence of environment and traffic can be reduced, the construction period is shortened, and the construction risk is reduced.
The tunnel construction method provided by the invention can be applied to underground tunnel engineering such as inter-city railway tunnels and station structures thereof, variable-diameter underground water delivery tunnels, Y-shaped tunnels and the like besides being applied to subway tunnel construction and station platform integrated non-excavation construction. The following description will be given by taking shield-shield tunnel reducing construction as an example:
setting a receiving well at a position where diameter-changing construction is required;
after the construction of the previous shield is finished, the shield machine is received in a receiving well, and a receiving base and a guide rail structure of the shield machine are adjusted to be used for starting the shield machine of the next section of tunnel;
Finishing adjustment of cutterheads with different sizes in a receiving well, and expanding or shrinking the diameters of a front shield, a middle shield and a tail of a shield machine;
and installing a reaction frame structure suitable for the construction of the next section of shield machine, debugging equipment, and preparing for the construction of the next section of shield tunnel with different sizes.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
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| CN202210211699.0A CN114562277B (en) | 2022-03-04 | 2022-03-04 | A variable cross-section tunnel construction method |
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| CN202210211699.0A CN114562277B (en) | 2022-03-04 | 2022-03-04 | A variable cross-section tunnel construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116291497A (en) * | 2022-09-09 | 2023-06-23 | 中铁工程装备集团有限公司 | Variable-diameter tunnel construction method, system and shield equipment |
| CN116084976A (en) * | 2022-09-09 | 2023-05-09 | 中铁工程装备集团有限公司 | A variable-diameter tunnel construction method, system and shield equipment |
| CN116006197A (en) * | 2022-09-09 | 2023-04-25 | 中铁工程装备集团有限公司 | Variable-diameter tunnel construction method, system and shield equipment |
| CN116066136A (en) * | 2023-02-23 | 2023-05-05 | 中铁工程装备集团有限公司 | Underground station and construction method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08165894A (en) * | 1994-12-12 | 1996-06-25 | Minoru Yamamoto | Profile section excavation tunnel machine |
| CN111810184A (en) * | 2020-05-28 | 2020-10-23 | 中铁十四局集团第三工程有限公司 | A kind of variable section tunnel construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07145699A (en) * | 1993-11-24 | 1995-06-06 | Nishimatsu Constr Co Ltd | Tunnel shield construction method with varying cross-sectional diameter and its shield machine |
| JP3151357B2 (en) * | 1994-08-11 | 2001-04-03 | 帝都高速度交通営団 | Tunnel construction method |
| CN2497043Y (en) * | 2001-07-17 | 2002-06-26 | 天津第二市政公路工程有限公司 | Replaceable earth-pressure balancing pipe-jacking entry-driving machine |
| CN104265321B (en) * | 2014-08-06 | 2016-04-13 | 上海隧道工程有限公司 | Ultra-large type tunneling boring rectangular top pipe tunneling construction method |
| CN105041327B (en) * | 2015-08-27 | 2017-12-19 | 北京建工土木工程有限公司 | Bored tunnel is counter to dig shield method of reseptance |
| CN110966009B (en) * | 2019-12-31 | 2022-02-18 | 中铁第四勘察设计院集团有限公司 | Construction method of bifurcated tunnel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08165894A (en) * | 1994-12-12 | 1996-06-25 | Minoru Yamamoto | Profile section excavation tunnel machine |
| CN111810184A (en) * | 2020-05-28 | 2020-10-23 | 中铁十四局集团第三工程有限公司 | A kind of variable section tunnel construction method |
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