CN105065009B - A kind of method extending shield-tunneling construction subway station - Google Patents
A kind of method extending shield-tunneling construction subway station Download PDFInfo
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- CN105065009B CN105065009B CN201510504778.0A CN201510504778A CN105065009B CN 105065009 B CN105065009 B CN 105065009B CN 201510504778 A CN201510504778 A CN 201510504778A CN 105065009 B CN105065009 B CN 105065009B
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- 238000010276 construction Methods 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000002689 soil Substances 0.000 claims abstract description 13
- 238000009412 basement excavation Methods 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 10
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
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- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention provides a kind of method extending shield-tunneling construction subway station, adopt pipe-jacking technology at shield tunnel both sides construction working pipe, reduce the soil deformation amount in work progress; Adopting Curve Pipe Jacking method to be connected with instrumentation tubes by shield duct piece in tunnel, as top shield pipeline, and once excavation can form subway station top shield structure, and construction procedure is more succinct; Inject concrete in the most backward top shield pipeline, instrumentation tubes and vertical supporting pipe, form the supporting construction at whole station, then remove shield duct piece, apply station two and serve as a contrast and accessory structure; The method has efficiency of construction height, the simple feature of operation, substantially reduce station to excavate urban environmental impact, improve shield subway work efficiency, save construction cost, and adapt to city shallow embedding complex geological condition, the Metro Station Structure intensity using the method building is high, and supporting is safe and reliable.
Description
Technical field
The present invention relates to a kind of method extending shield-tunneling construction subway station, belong to underground engineering trenchless technology field.
Background technology
Along with China's economic development and the level of urbanization improve, traffic problems have become as the key issue of restriction urban development, need solution badly. Shield method subway as the important component part of Urban Public Transportation Network, to alleviating traffic jam, improve urban development speed, the level of modernization that promotes city plays huge effect. But owing to shield zone distance is short, station quantity is many, shield often has to wait for ability transition after completing in station, cause that the improper driving time is too much, Suporting structure utilization rate is on the low side, causing construction delay phenomenon, increase construction cost, therefore shield station is the principal element of restriction subway work cycle and cost.
At present, the conventional construction method of subway station includes cut and cover method, cap excavation method and subsurface excavation method etc. Cut and cover method is applicable to broad construction site, and urban life interference is big, blocks traffic for a long time, the impact on environment such as noise and vibrations. Cap excavation method stud construction joint is more, need to carry out water-proofing treatment, and inconvenience of being unearthed, work efficiency is low, and speed of application is slow. The shallow mining method duration is longer, and settlement of stratum is relatively big on the impact of adjacent buildings safety, and construction risk is big, and construction costs is also significantly high.
Summary of the invention
It is an object of the invention to solve the deficiencies in the prior art, and a kind of method extending shield-tunneling construction subway station is provided, the method has efficiency of construction height, the simple feature of operation, substantially reduce station to excavate urban environmental impact, improve shield subway work efficiency, save construction cost, and adapt to city shallow embedding complex geological condition, the Metro Station Structure intensity using the method building is high, and supporting is safe and reliable.
Realizing the technical scheme that the object of the invention adopts is, a kind of method extending shield-tunneling construction subway station comprises the steps:
(1) the reserved underground space in shield construction subway station is adopted to form shield tunnel, shield tunnel is supported by shield duct piece, bottom support of constructing in shield tunnel basis, mid-board and top temporary support, pass through 2 calibers of the push bench process jacking pipeline less than shield tunnel diameter as instrumentation tubes in shield tunnel both sides;
(2) in the temporary support of top, build push pipe work platforms and pipe jacking equipment is installed, on shield duct piece top flat, boring cutting mounting hole device are as push-bench originating terminal, in two instrumentation tubes, correspondence position boring cutting forms push-bench receiving terminal, adopting Curve Pipe Jacking method axially to construct side by side to shield tunnel both sides along shield tunnel more than 2 top shield pipelines by pipe jacking equipment, each top shield pipeline along the axially in parallel arrangement of shield tunnel constitutes subway station vault supporting construction;
(3) vertical jacking device is installed in instrumentation tubes, utilize the vertical jacking device vertical supporting pipe that vertical jacking more than 2 is parallel to each other in the stratum below two instrumentation tubes, vertical supporting Guan Junyu instrumentation tubes connects, and each vertical supporting pipe along the axially in parallel arrangement of shield tunnel constitutes subway station side wall support structure;
(4) to fill concrete in top shield pipeline, instrumentation tubes and vertical supporting pipe, the internal supporting construction in subway station is formed;
(5) along the axially away shield duct piece being positioned at above the temporary support of top of shield tunnel, top temporary support being extended to and connect with instrumentation tubes, construct in the vault supporting construction of subway station lining and vault two at the beginning of vault serve as a contrast;
(6) after vault two lining reaches design strength, dismounting is positioned at the shield duct piece above shield duct piece egative film symmetrical excavation soil at both sides to reaching metno station design absolute altitude, subway station side wall support structure is constructed serve as a contrast at the beginning of side wall and serve as a contrast with side wall two, base plate of constructing;
(7) after side wall two lining reaches design strength, top temporary support is removed, construction subway station internal structure, complete metro station construction.
Step (1) is constructed in shield tunnel bottom support basis, mid-board, top temporary support, middle part temporary support and bottom temporary support, wherein middle part temporary support is arranged on the level axial plane of shield tunnel, and bottom temporary support is arranged in the lower space of shield tunnel.
Step (6) is removed middle part temporary support, bottom temporary support after vault two lining reaches design strength and is positioned at the shield duct piece above shield duct piece egative film.
In step (2) on top shield pipeline preset injected hole, top shield pipeline jacking carries out grouting and reinforcing by the injected hole of top shield pipeline to the soil body of adjacent two top shield pipeline enclosures after completing, and forms grouting and reinforcing district.
Step (3) offers fracture on vertical supporting pipe vertically, fracture is welded with channel-section steel, channel-section steel is integrally located in vertical supporting pipe and opening is towards fracture, the position that the outer surface of vertical supporting pipe is relative with fracture is welded with T-shaped angle steel, T-shaped angle steel embeds and forms snap close in channel-section steel, is connected by snap close by adjacent two vertical supporting pipes and injects sealing serosity in snap close as waterproof construction.
In step (5), the particular content of lining at the beginning of construction vault for construction top waterproof layer in the vault supporting construction of subway station and anchors vault template, and the particular content of construction vault two lining is assembling reinforcement casting concrete in vault template.
In step (6), the particular content of lining at the beginning of construction side wall is construct in the side wall support structure of subway station side wall waterproof layer and anchored side wall form, the particular content of construction side wall two lining is assembling reinforcement casting concrete in side wall template, the particular content of construction base plate is for construction bottom waterproof layer and anchors bottom template, assembling reinforcement casting concrete in the template of bottom.
As shown from the above technical solution, the method for enlarging shield-tunneling construction subway station provided by the invention, adopt pipe-jacking technology at shield tunnel both sides construction working pipe, reduce the soil deformation amount in work progress;Curve Pipe Jacking method construction top shield pipeline is adopted to be connected with instrumentation tubes by shield duct piece in tunnel, each top shield pipeline of parallel arrangement constitutes subway station vault supporting construction, once excavation can form subway station top shield structure, and construction procedure is more succinct; Entering row's vertical supporting pipe to stratum vertical top in instrumentation tubes, each vertical supporting pipe of parallel arrangement constitutes subway station side wall support structure; Concrete is injected in the most backward top shield pipeline, instrumentation tubes and vertical supporting pipe, form the supporting construction at whole station, then removing shield duct piece, lining at the beginning of construction vault, vault two serve as a contrast, lining at the beginning of side wall, side wall two serve as a contrast, base plate and subway station internal structure, complete metro station construction.
Compared with prior art, construction method provided by the invention has the advantage that
(1) adopting shield method directly to miss the stop, not needing to stop work waits station construction, improves the utilization rate of Suporting structure;
(2) enlarging within subway station is realized by construction working pipe, owing to the jacking of instrumentation tubes only needs the small-sized upper pipe working well of two ends construction AT STATION, reduces city earth excavation and construction site, and urban transportation interference is little;
(3) adopting pipe-jacking technology jacking instrumentation tubes in shield tunnel both sides, as the reception pipe of top shield pipeline, compared to tunneling pilot tunnel method, its efficiency of construction is higher and surrounding enviroment impact is little;
(4) vault of subway station is made up of lining at the beginning of subway station vault supporting construction (top shield pipeline group), vault and vault two lining, compared to sidepiece and bottom, above vault, the relatively thin therefore intensity of the soil body is less than station sidepiece and bottom, the structure of lining at the beginning of existing vault and vault two lining increases top shield pipeline group, the intensity of vault can be greatly promoted, and grouting and reinforcing forms grouting and reinforcing district between top shield pipeline, increase intensity between top shield pipeline pipe on the one hand, simultaneously work as good waterproof effect;
(5) Curve Pipe Jacking method jacking top shield pipeline is adopted, therefore the subway station vault supporting construction formed is Convex curve shape, curve-like adds the lifting surface area of top shield pipeline and expands space, station simultaneously, and the stress of top shield pipeline is more reasonable;
(6) sidewall of subway station is by subway station side wall support structure (vertical supporting pipe group), lining at the beginning of side wall and side wall two lining are constituted, subway station sidewall is primarily subjected to the squeezing action from the lateral soil body, it is likely to result in side wall lining cutting when active force is bigger and crackle occurs, the present invention is directed to above-mentioned true employing sidewall three layers liner structure, the structure of lining at the beginning of existing side wall and side wall two lining increases vertical supporting pipe group, the intensity of sidewall can be greatly promoted, and connected by slip casting snap close between vertical supporting pipe, increase intensity between vertical supporting pipe pipe on the one hand, simultaneously work as good waterproof effect, can be used for sealing between the pipe of water rich strata, therefore this method does not need the extra dewatering operation carried out for sealing, vertical supporting pipe and top shield pipe are connected as a single entity, play the effect supporting top structure, reduce soil at both sides excavation deformation,
(7) equal fill concrete in all pipe fittings (top shield pipeline, instrumentation tubes and vertical supporting pipe), the rigidity of structure is big, good stability, reduces the surrounding soil deformation that follow-up station excavation causes;
(8) structure of assembling reinforcement casting concrete in water layer and the template of setting up defences in just lining provided by the invention, two linings and base plate employing, waterproof layer plays the effect of secondary waterproof, the rigidity of structure that template, reinforcing bar and concrete cast are formed is big, and good stability has good durability simultaneously.
Accompanying drawing explanation
Fig. 1 is the Construction Principle figure of the method for enlarging shield-tunneling construction subway station provided by the invention.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is the B-B profile of Fig. 1.
Fig. 4 is shield tunnel and the schematic diagram of construction both sides instrumentation tubes.
Fig. 5 is the schematic diagram of Curve Pipe Jacking method construction top shield pipeline.
Fig. 6 is the schematic diagram of construction vertical supporting pipe.
Fig. 7 is the schematic diagram of fill concrete.
Fig. 8 is the schematic diagram of lining and vault two lining at the beginning of construction vault.
Fig. 9 is that excavation soil at both sides is to the schematic diagram reaching metno station design absolute altitude.
Figure 10 is that at the beginning of construction side wall, lining, side wall two serve as a contrast and the schematic diagram of base plate.
Figure 11 is the schematic diagram of construction subway station internal structure.
Wherein, 1-top flat, shield duct piece on the upside of 2-, shield duct piece in the middle part of 3-, 4-egative film, 5-top temporary support, temporary support in the middle part of 6-, temporary support bottom 7-, 8-mid-board, 9-top shield pipeline, 10-instrumentation tubes, 11-vertical supporting pipe, 12-concrete, 13-vault two serves as a contrast, and 14-side wall two serves as a contrast, 15-platform, 16-base plate, 17-bottom support basis, 18-grouting and reinforcing district, 19-injected hole, 20-snap close.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention being illustrated in detail, present disclosure is not limited to following example.
The method of enlarging shield-tunneling construction subway station provided by the invention, Construction Principle is as it is shown in figure 1, comprise the steps:
(1) the reserved underground space in shield construction subway station is adopted to form shield tunnel, shield tunnel is supported by shield duct piece, shield duct piece includes top flat 1, upside shield duct piece 2, middle part shield duct piece 3 and egative film 4, the small-sized upper pipe working well of both sides construction AT STATION, pipe jacking equipment is installed in active well, 2 calibers of the jacking pipeline less than shield tunnel diameter is synchronized as instrumentation tubes 10 by push bench process, referring to Fig. 4 in shield tunnel both sides;
(2) construction top temporary support 5, middle part temporary support 6 and bottom temporary support 7 in shield tunnel, wherein top temporary support 5 is positioned at the junction of upside shield duct piece 2 and middle part shield duct piece 3, middle part temporary support is arranged on the level axial plane of shield tunnel, bottom temporary support is arranged in the lower space of shield tunnel and is positioned at above egative film, on shield duct piece egative film 4, construction is for supporting bottom support basis 17 and the mid-board 8 of mid-board, the top of mid-board is connected with shield duct piece top flat, support the top shield pipeline 9 of both sides, referring to Fig. 5;
(3) in top temporary support 5, build push pipe work platforms and pipe jacking equipment is installed, on shield duct piece top flat, boring cutting mounting hole device are as push-bench originating terminal, in two instrumentation tubes, correspondence position boring cutting forms push-bench receiving terminal, preset injected hole 19 on top shield pipeline, Curve Pipe Jacking method is adopted axially to construct side by side to shield tunnel both sides along shield tunnel more than 2 top shield pipelines by pipe jacking equipment, top shield pipeline 9 originates in shield tunnel, and receive in instrumentation tubes, each top shield pipeline along the axially in parallel arrangement of shield tunnel constitutes subway station vault supporting construction, referring to Fig. 5, grouting and reinforcing is carried out to the soil body of adjacent two top shield pipeline enclosures by the injected hole of top shield pipeline, form grouting and reinforcing district 18, as shown in Figure 2,
(4) vertical jacking device is installed in instrumentation tubes and in instrumentation tubes bottom opening, utilize vertical jacking device to more than 2 vertical supporting pipes 11 being parallel to each other of the vertical jacking in the stratum below two instrumentation tubes, vertical supporting pipe connects with instrumentation tubes, each vertical supporting pipe along the axially in parallel arrangement of shield tunnel constitutes subway station side wall support structure, referring to Fig. 6, described vertical supporting pipe offers fracture vertically, fracture is welded with channel-section steel, channel-section steel is integrally located in vertical supporting pipe and opening is towards fracture, the position that the outer surface of vertical supporting pipe is relative with fracture is welded with T-shaped angle steel, T-shaped angle steel embeds and forms snap close 20 in channel-section steel, the structure of snap close is as shown in Figure 3, adjacent two vertical supporting pipes are connected by snap close and injects in snap close and seal serosity as waterproof construction,
(5) to fill concrete 12 in top shield pipeline 9, instrumentation tubes 10 and vertical supporting pipe 11, the internal supporting construction in subway station is formed, referring to Fig. 7;
(6) along the axially away shield duct piece (upside shield duct piece 2) being positioned at above the temporary support of top of shield tunnel, top temporary support is extended to and connects with instrumentation tubes, construction top waterproof layer and anchor vault template as at the beginning of vault serve as a contrast, in vault template, assembling reinforcement casting concrete serve as a contrast 13 as vault two, referring to Fig. 8;
(7) after vault two lining reaches design strength, remove middle part temporary support, bottom temporary support and be positioned at the shield duct piece (middle part shield duct piece 3) above shield duct piece egative film, symmetrical excavation soil at both sides is to reaching metno station design absolute altitude, referring to Fig. 9;
(8) construction side wall waterproof layer and anchored side wall form serve as a contrast as at the beginning of side wall, in side wall template, assembling reinforcement casting concrete serve as a contrast 14 as side wall two, construction bottom waterproof layer and anchor bottom template, in the template of bottom, assembling reinforcement casting concrete are as base plate 16, referring to Figure 10;
(9) after side wall two lining reaches design strength, remove the internal structures such as top temporary support, construction Subway Station Platform 15, referring to Figure 11, complete metro station construction.
Claims (7)
1. the method extending shield-tunneling construction subway station, it is characterised in that comprise the steps:
(1) the reserved underground space in shield construction subway station is adopted to form shield tunnel, shield tunnel is supported by shield duct piece, bottom support of constructing in shield tunnel basis, mid-board and top temporary support, be total to 2 calibers of the jacking pipeline less than shield tunnel diameter as instrumentation tubes in shield tunnel both sides by push bench process;
(2) in the temporary support of top, build push pipe work platforms and pipe jacking equipment is installed, on shield duct piece top flat, boring cutting mounting hole device are as push-bench originating terminal, in two instrumentation tubes, correspondence position boring cutting forms push-bench receiving terminal, adopting Curve Pipe Jacking method along shield tunnel axially to shield tunnel both sides difference more than 2 top shield pipelines of construction side by side by pipe jacking equipment, each top shield pipeline along the axially in parallel arrangement of shield tunnel constitutes subway station vault supporting construction;
(3) vertical jacking device is installed in instrumentation tubes, vertical jacking device is utilized to be respectively perpendicular, in the stratum below two instrumentation tubes, the vertical supporting pipe that jacking more than 2 is parallel to each other, vertical supporting Guan Junyu instrumentation tubes connects, and each vertical supporting pipe along the axially in parallel arrangement of shield tunnel constitutes subway station side wall support structure;
(4) to fill concrete in top shield pipeline, instrumentation tubes and vertical supporting pipe, the internal supporting construction in subway station is formed;
(5) along the axially away shield duct piece being positioned at above the temporary support of top of shield tunnel, top temporary support being extended to and connect with instrumentation tubes, construct in the vault supporting construction of subway station lining and vault two at the beginning of vault serve as a contrast;
(6) after vault two lining reaches design strength, dismounting is positioned at the shield duct piece above shield duct piece egative film symmetrical excavation soil at both sides to reaching metno station design absolute altitude, subway station side wall support structure is constructed serve as a contrast at the beginning of side wall and serve as a contrast with side wall two, base plate of constructing;
(7) after side wall two lining reaches design strength, top temporary support is removed, construction subway station internal structure, complete metro station construction.
2. the method for enlarging shield-tunneling construction subway station according to claim 1, it is characterized in that: construct in shield tunnel in step (1) bottom support basis, mid-board, top temporary support, middle part temporary support and bottom temporary support, wherein middle part temporary support is arranged on the level axial plane of shield tunnel, and bottom temporary support is arranged in the lower space of shield tunnel.
3. the method for enlarging shield-tunneling construction subway station according to claim 2, it is characterised in that: step (6) is removed middle part temporary support, bottom temporary support after vault two lining reaches design strength and is positioned at the shield duct piece above shield duct piece egative film.
4. the method for enlarging shield-tunneling construction subway station according to claim 1, it is characterized in that: in step (2) on top shield pipeline preset injected hole, top shield pipeline jacking carries out grouting and reinforcing by the injected hole of top shield pipeline to the soil body of adjacent two top shield pipeline enclosures after completing, and forms grouting and reinforcing district.
5. the method for enlarging shield-tunneling construction subway station according to claim 1, it is characterized in that: step (3) offers fracture on vertical supporting pipe vertically, fracture is welded with channel-section steel, channel-section steel is integrally located in vertical supporting pipe and opening is towards fracture, the position that the outer surface of vertical supporting pipe is relative with fracture is welded with T-shaped angle steel, T-shaped angle steel embeds and forms snap close in channel-section steel, is connected by snap close by adjacent two vertical supporting pipes and injects sealing serosity in snap close as waterproof construction.
6. the method for enlarging shield-tunneling construction subway station according to claim 1, it is characterized in that: in step (5), the particular content of lining at the beginning of construction vault for construction top waterproof layer in the vault supporting construction of subway station and anchors vault template, the particular content of construction vault two lining is assembling reinforcement casting concrete in vault template.
7. the method for enlarging shield-tunneling construction subway station according to claim 1, it is characterized in that: in step (6), the particular content of lining at the beginning of construction side wall is construct in the side wall support structure of subway station side wall waterproof layer and anchored side wall form, the particular content of construction side wall two lining is assembling reinforcement casting concrete in side wall template, the particular content of construction base plate is for construction bottom waterproof layer and anchors bottom template, assembling reinforcement casting concrete in the template of bottom.
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| CN201510504778.0A CN105065009B (en) | 2015-08-17 | 2015-08-17 | A kind of method extending shield-tunneling construction subway station |
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| CN201510504778.0A CN105065009B (en) | 2015-08-17 | 2015-08-17 | A kind of method extending shield-tunneling construction subway station |
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| CN105065009B true CN105065009B (en) | 2016-06-08 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107905795B (en) * | 2017-09-25 | 2019-04-02 | 上海建工集团股份有限公司 | Subway station is inverse under a kind of operation condition widens method |
| CN107905794B (en) * | 2017-09-25 | 2019-03-22 | 上海建工集团股份有限公司 | It is a kind of retain tunnel part section of jurisdiction subway station widen method |
| CN110985044B (en) * | 2019-12-26 | 2021-07-30 | 中铁工程装备集团有限公司 | Segment splicing supporting structure and construction method for three-round shield tunnel construction |
| CN111075469A (en) * | 2019-12-30 | 2020-04-28 | 贵州理工学院 | Subway station auxiliary structure and construction process thereof |
| CN111411968B (en) * | 2020-03-04 | 2021-08-03 | 中国建筑第二工程局有限公司 | Expanding excavation structure for shield tunnel foundation and construction method thereof |
| CN111810193A (en) * | 2020-05-28 | 2020-10-23 | 中铁十四局集团第三工程有限公司 | Small-section tunnel secondary lining construction method |
| CN113494073B (en) * | 2021-07-27 | 2022-07-15 | 湖北望新建设有限公司 | Non-excavation combined reinforcement construction method |
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| DE3725963A1 (en) * | 1987-08-05 | 1989-02-16 | Gewerk Eisenhuette Westfalia | Method and apparatus for constructing a concrete foundation in the earth, in particular in a built-up area |
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| CN204457789U (en) * | 2015-02-04 | 2015-07-08 | 北京市政建设集团有限责任公司 | A kind of stake arch wall supports the subway station digging large diameter shield tunnel and build |
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| JPH02132295A (en) * | 1988-11-14 | 1990-05-21 | Mitsui Constr Co Ltd | Constructing method for tunnel lining work |
| JP4226433B2 (en) * | 2003-10-16 | 2009-02-18 | 株式会社熊谷組 | Shield joining method and protective barrier structure |
| CN103437782B (en) * | 2013-08-21 | 2015-08-19 | 中国长江三峡集团公司 | Hydraulic pressure automatic moving type steel form carrier and construction method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3725963A1 (en) * | 1987-08-05 | 1989-02-16 | Gewerk Eisenhuette Westfalia | Method and apparatus for constructing a concrete foundation in the earth, in particular in a built-up area |
| CN101182772A (en) * | 2007-11-20 | 2008-05-21 | 中铁二局股份有限公司 | Two lines intersection small radius, shallow earth covering and large longitudinal slope complicated linetype shield construction method |
| CN104632235A (en) * | 2015-02-04 | 2015-05-20 | 北京市政建设集团有限责任公司 | Method for expanding excavation of large-diameter shield tunnel for subway station construction through pile arch wall support |
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