CN102392648A - Method for building subway station by expansively digging large-diameter shield tunnel - Google Patents

Method for building subway station by expansively digging large-diameter shield tunnel Download PDF

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Publication number
CN102392648A
CN102392648A CN201110307831XA CN201110307831A CN102392648A CN 102392648 A CN102392648 A CN 102392648A CN 201110307831X A CN201110307831X A CN 201110307831XA CN 201110307831 A CN201110307831 A CN 201110307831A CN 102392648 A CN102392648 A CN 102392648A
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China
Prior art keywords
tunnel
diameter shield
jurisdiction
station
construction
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CN201110307831XA
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Chinese (zh)
Inventor
魏怡
乐贵平
杨秀仁
颜莓
关龙
刘军
鲁卫东
江玉生
袁大军
杨思忠
李爱民
丁德云
刘维宁
郭玉海
曾德光
郭德友
赵衍发
路宗存
庞振勇
张彦
王文军
程小虎
李宏安
徐凌
汪挺
杨寒冰
陈衡达
Original Assignee
北京市轨道交通建设管理有限公司
北京城建设计研究总院有限责任公司
天津市市政工程设计研究院
北京市政建设集团有限责任公司
中国矿业大学(北京)
北京交通大学
北京港创瑞博混凝土有限公司
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Application filed by 北京市轨道交通建设管理有限公司, 北京城建设计研究总院有限责任公司, 天津市市政工程设计研究院, 北京市政建设集团有限责任公司, 中国矿业大学(北京), 北京交通大学, 北京港创瑞博混凝土有限公司 filed Critical 北京市轨道交通建设管理有限公司
Priority to CN201110307831XA priority Critical patent/CN102392648A/en
Publication of CN102392648A publication Critical patent/CN102392648A/en

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Abstract

The invention relates to a brand new method for building subway station by expansively digging large-diameter shield tunnel; namely, based on the large-diameter shield tunnel, the subway station is dug and built by shallow bedding and undercutting method. The invention mainly comprises the following steps: (1) assembling the large-diameter shield segments for the station in the range of the station; (2) building bottom girder, rectangular column and top girder in the shield tunnel, and establishing a temporary support; (3) symmetrically digging first supporting protection of the platform tunnel by the shallow bedding and undercutting method; (4) symmetrically removing the shield segments, the temporary support and other temporary structures; (5) constructing the second lining and platform panel of the platform tunnel. The invention gives full play of the advantages of the shield method and the shallow bedding and undercutting method, which can largely reduce the influence to the surrounding environment and adjacent building structures under complex construction environment of city; the construction period is shortened and the project cost is decreased.

Description

Large diameter shield tunnel expands the method for building the subway station of digging

Technical field

The present invention relates to a kind of large diameter shield tunnel and expand the method for digging the construction subway station, belong to the underground structrue engineering technical field.

Background technology

At present, the job practices of Beijing Metro mainly contains cut and cover method, shallow burial hidden digging and shield method.The general shield method that adopts of the interval construction of subway; Cut and cover method or shallow burial hidden digging construction are generally adopted in the station.Interval shield construction often receives the restriction of station construction, makes the advantage of shield method not give full play to, and causes the prolongation of subway line construction period and the raising of construction cost.

Along with the encryption of Beijing Metro Network, the subway engineering construction faces the environment that becomes increasingly complex: the periphery vicinity building that road is narrow, traffic above-ground is busy, a large amount of, intensive underground utilities etc.These complicated built environments bring huge obstacle for the construction of subway engineering, possibly cause subway line difficult arrangement, construction risk to strengthen; Simultaneously more strict requirement has been proposed also the subway job practices.Particularly in can't realizing the subway engineering that single hole single track line circuit is arranged, the requirement construction is little to surrounding environment influence, should seek suitable new job practices.

Summary of the invention

The object of the present invention is to provide a kind of completely new approach that is applicable to that build the subway station under the complicated built environment in city, promptly on the large diameter shield tunnel basis, adopt shallow burial hidden digging to expand the excavation construction subway station.The present invention gives full play to the advantage of shield method and shallow burial hidden digging, can be implemented under the complicated built environment in city and build subway engineering fast, efficiently and economically.

At present, shallow burial hidden digging mainly comprises following several kinds: median septum method (CD method), intersection median septum method (CRD method), twin side heading method, hole stake method etc.

Hole stake method with in the shallow burial hidden digging is an example, and concrete job practices of the present invention comprises the steps:

(1) the large-diameter shield construction is through the station, and the large-diameter shield section of jurisdiction is used at the assembly unit station in the scope AT STATION;

(2) in large diameter shield tunnel, execute and make bottom girder-rectangular column-back timber, and set up interim support;

(3) adopt hole stake method symmetry to expand top, excavation construction platform tunnel, comprise that excavating pilot tunnel tunnel, pile driving construction and top just props up the button arch, sets up interim support and interim median septum;

(4) symmetry is removed the interim support of section of jurisdiction, large diameter shield tunnel top, part pilot tunnel tunnel and part, carries out top secondary lining button arch;

(5) switch interim support, remove interim median septum, excavation bottom, the platform tunnel soil body is to substrate, and dismounting section of jurisdiction, large diameter shield tunnel bottom;

(6) execute and make bottom, platform tunnel secondary lining;

(7) remove support temporarily, execute and make the platform plate, accomplish the station structure construction.

Above-mentioned technical scheme shifts to an earlier date slip casting at periphery before the pilot tunnel tunnel excavation, do advance support before the platform tunnel excavation; Said large-diameter shield section of jurisdiction is a through seam assembling, and easy-to-dismount piecemeal pattern is adopted in said section of jurisdiction, and on the inside and outside cambered surface of said section of jurisdiction pre-embedded steel slab.

Hole stake method with in the shallow burial hidden digging is an example, and the present invention requires to accomplish in work progress:

(1) the large-diameter shield section of jurisdiction must through seam assembling in the scope AT STATION, and section of jurisdiction piecemeal pattern will be convenient to its dismounting, needs structures such as pre-embedded steel slab is convenient to just, support temporarily to be connected on the section of jurisdiction;

The interim support of (2) in large diameter shield tunnel, setting up need be satisfied intensity and stability requirement, the distortion of restriction shield duct piece;

(3) slip casting to be shifted to an earlier date at periphery before the pilot tunnel tunnel excavation, advance support will be done before the platform tunnel excavation.During soil excavation, note the symmetry excavation, and keep certain length of bench that will set up interim support and interim median septum simultaneously, just a button arch must be timely, satisfies control stratum deformation and stability requirement;

(4) in pilot tunnel, execute downwards and do stake, need to satisfy the stake footpath, stake is long and the requirement of spacing;

(5) dismounting of large-diameter shield section of jurisdiction should be from top to bottom, removes one by one during along with the excavation soil body by segmented construction, should guarantee the safety of total system during dismounting.Adopt measures such as special dismounting equipment and instrument, the interim support of increase in case of necessity.The section of jurisdiction will be transported safely and leave the construction plant after being removed;

(6) secondary lining button arch need in time be executed work after removing top, large-diameter shield section of jurisdiction, guarantees construction safety;

(7) note switching opportunity of interim support, guarantee that the longest interim bracing frame is located at secondary lining behind the secondary lining button arch to buckle the arch bottom.

Hole stake method with in the shallow burial hidden digging is an example, in whole construction course, and the concrete control of job practices:

(1) through seam assembling large-diameter shield section of jurisdiction, the position, section of jurisdiction that guarantees to contain pre-embedded steel slab is accurate;

(2) pilot tunnel tunnel perimeter range of grouting and intensity, the intensity of platform tunnel upper advance support;

(3) stake footpath, the long and spacing of stake;

(4) interim intensity and the stability that supports;

(5) the platform tunnel just props up the stability of detaining arch with two linings;

(6) stability of back structural system is removed in the large-diameter shield section of jurisdiction.

Simultaneously, the present invention also can adopt intersection median septum method (CRD method) to expand excavation construction Double Multi-Arch station, in work progress, and except not having pile driving construction, other major control project and content and hole stake method basically identical.

Intersection median septum method (CRD method) with in the shallow burial hidden digging is an example, and the concrete job practices of the present invention when the construction subway station is dug in the large diameter shield tunnel expansion comprises the steps:

(1) the large-diameter shield construction is through the station, and the large-diameter shield section of jurisdiction is used at the assembly unit station in the scope AT STATION;

(2) in large diameter shield tunnel, execute and make bottom girder-rectangular column-back timber, and set up interim support;

(3) adopt CRD method symmetry to expand excavation construction platform tunnel, set up just and prop up, support temporarily and interim median septum;

(4) symmetry is removed section of jurisdiction, large diameter shield tunnel top, interim median septum, and switches length and support temporarily;

(5) symmetry is removed section of jurisdiction, large diameter shield tunnel bottom and interim median septum, switches length and supports temporarily, and execute and make bottom, platform tunnel secondary lining;

(6) execute and make top, platform tunnel secondary lining;

(7) remove support temporarily, execute and make the platform plate, accomplish the station structure construction.

In said method, before the platform tunnel excavation, do advance support.The large-diameter shield section of jurisdiction is a through seam assembling, and easy-to-dismount piecemeal pattern is adopted in said section of jurisdiction, and on the inside and outside cambered surface of said section of jurisdiction pre-embedded steel slab.

The invention has the beneficial effects as follows:

(1) technological merit safely and efficiently of giving full play to shield method and being had improves the Suporting structure utilization rate;

(2) construction organization of planning as a whole station and running tunnel designs, and solves the duration contradiction of interval shield-tunneling construction and station construction; Practice thrift the construction period of subway engineering greatly.

(3) interval circuit that solves difficult location under the complicated built environment is arranged and station construction risk problem;

(4) give full play to the advantage of shield method and shallow burial hidden digging, significantly reduce construction, can practice thrift engineering cost greatly the influence of surrounding environment with contiguous construction of structures.

The novel construction method that this invention relates to combines shield method and shallow burial hidden digging; Learn from other's strong points to offset one's weaknesses, have complementary advantages, both can realize that the subway line under the limited road condition was arranged; Can be implemented in quick, the efficient and economic construction of subway under the urban compact building complex environment again; The safety of engineering and duration all can effectively be ensured, significantly reduce construction to the influence of surrounding environment with contiguous construction of structures, shorten the duration of a project and reduce construction costs.

Below in conjunction with the accompanying drawing and the specific embodiment the present invention being further specified, so that those skilled in the art can clearerly learn job practices of the present invention, is not limitation of the present invention.

Description of drawings

Fig. 1 is Double Multi-Arch of the present invention station schematic cross-sectional view (stake method in hole expands excavation construction);

Fig. 2 is Double Multi-Arch station construction of the present invention (stake method in hole expands excavation construction), excavation top, platform tunnel cross-sectional drawing;

Fig. 3 is Double Multi-Arch station construction of the present invention (stake method in hole expands excavation construction), excavation bottom, platform tunnel cross-sectional drawing;

Fig. 4 is Double Multi-Arch of the present invention station schematic cross-sectional view (the CRD method expands excavation construction);

Fig. 5 is Double Multi-Arch station construction scheme sketch map of the present invention (the CRD method expands excavation construction).

Description of reference numerals:

1 pilot tunnel tunnel, 2 campsheds

The section of jurisdiction that the section of jurisdiction 4 of 3 dismountings keeps

5 top longerons, 6 rectangular columns

7 bottom girders, 8 platform tunnels

9 platform plates 10 support temporarily

11 interim median septums.

The specific embodiment

See also Fig. 1-3, be respectively Double Multi-Arch of the present invention station schematic cross-sectional view (stake method in hole expands excavation construction), excavation platform tunnel top cross-sectional drawing and excavation bottom, platform tunnel cross-sectional drawing.Hole stake method with in the shallow burial hidden digging is an example, and the concrete job practices of the present invention when the construction subway station is dug in the large diameter shield tunnel expansion comprises the steps:

(1) the large-diameter shield construction is through the station, and the large-diameter shield section of jurisdiction is used at the assembly unit station in the scope AT STATION;

(2) in large diameter shield tunnel, execute and make bottom girder-rectangular column 6-back timber, and set up interim support 10;

(3) adopt hole stake method symmetry to expand 8 tops, excavation construction platform tunnel, comprise that excavating pilot tunnel tunnel 1, campshed 2 constructions and top just props up the button arch, sets up interim support 10 and interim median septum 11;

(4) symmetry is removed the interim support 10 of section of jurisdiction, large diameter shield tunnel top, part pilot tunnel tunnel 1 and part, carries out top secondary lining button arch;

(5) switch interim support 10, remove interim median septum 11, the excavation platform tunnel 8 bottom soil bodys are to substrate, and dismounting section of jurisdiction, large diameter shield tunnel bottom;

(6) execute and make platform tunnel 8 bottom secondary linings;

(7) remove interim support 10, execute and make platform plate 9, accomplish the station structure construction.

Before the pilot tunnel tunnel excavation, shift to an earlier date slip casting, do advance support before the platform tunnel excavation at periphery.The large-diameter shield section of jurisdiction is a through seam assembling, and easy-to-dismount piecemeal pattern is adopted in said section of jurisdiction, and on the inside and outside cambered surface of said section of jurisdiction pre-embedded steel slab.

Expand at above-mentioned large diameter shield tunnel and to dig in the work progress of building the subway station, the major control project with the contents are as follows:

(1) through seam assembling large-diameter shield section of jurisdiction 3 and 4, the position, section of jurisdiction that guarantees to contain pre-embedded steel slab is accurate;

Large-diameter shield section of jurisdiction 3 must through seam assemblings with 4 in the scope AT STATION, need on the section of jurisdiction pre-embedded steel slab be convenient to just prop up, structure such as support temporarily is connected, section of jurisdiction piecemeal pattern will be convenient to its dismounting.In the process of through seam assembling section of jurisdiction, the position, section of jurisdiction that guarantee to contain pre-embedded steel slab is accurate.

(2) pilot tunnel tunnel 1 peripheral range of grouting and intensity, the intensity of platform tunnel 8 top advance supports;

Before pilot tunnel tunnel 1 excavation, need in its peripheral certain limit, to shift to an earlier date slip casting, treat that injecting cement paste reaches after the certain intensity, just can carry out the excavation in pilot tunnel tunnel 1, the stability of surrounding soil during with assurance excavation pilot tunnel tunnel; Before platform tunnel 8 excavations, because of its excavated section is long-pending bigger, need execute above it and make advance support, after waiting to reach design strength, can carry out soil excavation.

(3) diameter, length and the spacing of stake 2;

Stake 2 can be adopted manually digging hole or machine drilling perfusion as the case may be by executing work in the pilot tunnel tunnel 1, but must guarantee diameter, length and the spacing of stake 2, for follow-up construction provides safety assurance.

(4) support 10 intensity and stability temporarily;

In large diameter shield tunnel and the interim support 10 of setting up in cutting the earth mainly be used for limiting the distortion of large-diameter shield section of jurisdiction and proximity structure, guarantee its safety.Therefore interim intensity and the stability that supports must guarantee.

(5) platform tunnel 8 just props up the stability of encircleing with the secondary lining button;

Behind the top soil body in excavation platform tunnel 8, need in time carry out the work of executing that the button arch is just propped up on top, to prevent causing soil body landslide owing to the excavation load discharges.After remove the section of jurisdiction, top of large-diameter shield section of jurisdiction 3 and 4, should in time carry out secondary lining button arch.Just prop up and the stable assurance stratum of secondary lining button arch and the safety of other structure.

(6) stability of back structural system is removed in large-diameter shield section of jurisdiction 3 and 4.

Large-diameter shield section of jurisdiction 3 and 4 dismounting should be from top to bottom, remove one by one during along with the excavation soil body by segmented construction.Section of jurisdiction 3 and 4 dismounting can cause the stressed conversion of total system, should guarantee the safety of total system during dismounting.Adopt measures such as special dismounting equipment and instrument, the interim support of increase in case of necessity.

Simultaneously, the present invention has provided the CRD method that adopts in the shallow burial hidden digging and has expanded excavation construction Double Multi-Arch station schematic cross-sectional view and constructure scheme sketch map, shown in Fig. 4-5.In work progress, except not having pile driving construction, other major control project and content and hole stake method basically identical.

With the CRD method in the shallow burial hidden digging is example, and the concrete job practices of the present invention when the construction subway station is dug in the large diameter shield tunnel expansion comprises the steps:

(1) the large-diameter shield construction is through the station, and the large-diameter shield section of jurisdiction is used at the assembly unit station in the scope AT STATION;

(2) in large diameter shield tunnel, execute and make bottom girder-rectangular column 6-back timber, and set up interim support 10;

(3) adopt CRD method symmetry to expand excavation construction platform tunnel 8, set up just, support temporarily 10 and interim median septum 11;

(4) symmetry is removed section of jurisdiction, large diameter shield tunnel top, interim median septum 11, and switches the interim support 10 of length;

(5) symmetry is removed section of jurisdiction, large diameter shield tunnel bottom and interim median septum 11, switches length and supports 10 temporarily, and execute and make platform tunnel 8 bottom secondary linings;

(6) execute and make platform tunnel 8 top secondary linings;

(7) remove interim support 10, execute and make platform plate 9, accomplish the station structure construction.

In said method, before the platform tunnel excavation, do advance support.The large-diameter shield section of jurisdiction is a through seam assembling, and easy-to-dismount piecemeal pattern is adopted in said section of jurisdiction, and on the inside and outside cambered surface of said section of jurisdiction pre-embedded steel slab.

Dig in the construction subway station in the large diameter shield tunnel expansion, expand excavation construction and adopt which kind of method in the shallow burial hidden digging, should decide, accomplish to practice thrift cost, guarantee workmanship according to concrete project situation.

Claims (6)

1. a large diameter shield tunnel expands the method for digging the construction subway station, comprises the steps:
(1) the large-diameter shield construction is through the station, and the large-diameter shield section of jurisdiction is used at the assembly unit station in the scope AT STATION;
(2) in large diameter shield tunnel, execute and make bottom girder-rectangular column-back timber, and set up interim support;
(3) adopt hole stake method symmetry to expand top, excavation construction platform tunnel, comprise that excavating pilot tunnel tunnel, pile driving construction and top just props up the button arch, sets up interim support and interim median septum;
(4) symmetry is removed the interim support of section of jurisdiction, large diameter shield tunnel top, part pilot tunnel tunnel and part, carries out top secondary lining button arch;
(5) switch interim support, remove interim median septum, excavation bottom, the platform tunnel soil body is to substrate, and dismounting section of jurisdiction, large diameter shield tunnel bottom;
(6) execute and make bottom, platform tunnel secondary lining;
(7) remove support temporarily, execute and make the platform plate, accomplish the station structure construction.
2. large diameter shield tunnel according to claim 1 expands the method for digging the construction subway station, it is characterized in that: before said pilot tunnel tunnel excavation, shift to an earlier date slip casting at periphery, before said platform tunnel excavation, do advance support.
3. large diameter shield tunnel according to claim 1 expands the method for building the subway station of digging; It is characterized in that: said large-diameter shield section of jurisdiction is a through seam assembling; Easy-to-dismount piecemeal pattern is adopted in said section of jurisdiction, and on the inside and outside cambered surface of said section of jurisdiction pre-embedded steel slab.
4. a large diameter shield tunnel expands the method for digging the construction subway station, comprises the steps:
(1) the large-diameter shield construction is through the station, and the large-diameter shield section of jurisdiction is used at the assembly unit station in the scope AT STATION;
(2) in large diameter shield tunnel, execute and make bottom girder-rectangular column-back timber, and set up interim support;
(3) adopt CRD method symmetry to expand excavation construction platform tunnel, set up just and prop up, support temporarily and interim median septum;
(4) symmetry is removed section of jurisdiction, large diameter shield tunnel top, interim median septum, and switches length and support temporarily;
(5) symmetry is removed section of jurisdiction, large diameter shield tunnel bottom and interim median septum, switches length and supports temporarily, and execute and make bottom, platform tunnel secondary lining;
(6) execute and make top, platform tunnel secondary lining;
(7) remove support temporarily, execute and make the platform plate, accomplish the station structure construction.
5. large diameter shield tunnel according to claim 4 expands the method for digging the construction subway station, it is characterized in that: before the platform tunnel excavation, do advance support.
6. large diameter shield tunnel according to claim 4 expands the method for building the subway station of digging; It is characterized in that: said large-diameter shield section of jurisdiction is a through seam assembling; Easy-to-dismount piecemeal pattern is adopted in said section of jurisdiction, and on the inside and outside cambered surface of said section of jurisdiction pre-embedded steel slab.
CN201110307831XA 2011-10-12 2011-10-12 Method for building subway station by expansively digging large-diameter shield tunnel CN102392648A (en)

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CN103742155A (en) * 2013-12-24 2014-04-23 中国神华能源股份有限公司 Long-span segment removing method
CN103967051A (en) * 2014-04-22 2014-08-06 北京工业大学 Arch scaffolding shearing force wall type double-layer three-span subway station structure and construction method
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CN104632232A (en) * 2015-02-04 2015-05-20 北京市政建设集团有限责任公司 Pipeline segment dismantling method for expanding and excavating large-diameter shield tunnel and building subway station
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CN105240028A (en) * 2015-11-18 2016-01-13 上海市城市建设设计研究总院 Design method of subway station by adopting undercutting method in soft soil area
CN106837389A (en) * 2016-12-26 2017-06-13 北京城建集团有限责任公司 A kind of Underground Subway Station vertical shaft and transverse passage-way freeze water-stopping method
CN107288665A (en) * 2017-08-21 2017-10-24 中国建筑第八工程局有限公司 The construction method of Station
CN107575237A (en) * 2017-08-23 2018-01-12 广州地铁设计研究院有限公司 A kind of subsurface excavation method is combined the construction method of construction subway station with shield method
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CN102644466A (en) * 2012-04-27 2012-08-22 北京城建设计研究总院有限责任公司 Joist arching method for constructing ultra-shallow buried large-span underground excavated subway station in rocky stratum
CN102644466B (en) * 2012-04-27 2014-10-22 北京城建设计发展集团股份有限公司 Joist arching method for constructing ultra-shallow buried large-span underground excavated subway station in rocky stratum
CN103742155A (en) * 2013-12-24 2014-04-23 中国神华能源股份有限公司 Long-span segment removing method
CN103967051A (en) * 2014-04-22 2014-08-06 北京工业大学 Arch scaffolding shearing force wall type double-layer three-span subway station structure and construction method
CN103967051B (en) * 2014-04-22 2016-01-13 北京工业大学 A kind of bow member shearing wall-bilayer three is across the construction method of Metro Station Structure
CN104120739A (en) * 2014-08-11 2014-10-29 北京市政建设集团有限责任公司 Multi-pilot tunnel excavation one-off arching 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
CN104632232B (en) * 2015-02-04 2016-12-28 北京市政建设集团有限责任公司 A kind of large diameter shield tunnel that digs builds the section of jurisdiction method for dismounting of subway station
CN104632232A (en) * 2015-02-04 2015-05-20 北京市政建设集团有限责任公司 Pipeline segment dismantling method for expanding and excavating large-diameter shield tunnel and building subway station
CN104806251A (en) * 2015-04-27 2015-07-29 北京市轨道交通建设管理有限公司 Subsidiary inverted excavation construction method for urban subway station under complex environment
CN104806251B (en) * 2015-04-27 2017-05-17 北京市轨道交通建设管理有限公司 Subsidiary inverted excavation construction method for urban subway station under complex environment
CN105064397A (en) * 2015-07-26 2015-11-18 北京工业大学 Open excavation construction method for expanding excavation of station on metro interzone shield tunnel foundation
CN105041349A (en) * 2015-07-26 2015-11-11 北京工业大学 Underground excavation construction method for expanded excavation of station on basis of metro regional shield tunnel
CN105240028A (en) * 2015-11-18 2016-01-13 上海市城市建设设计研究总院 Design method of subway station by adopting undercutting method in soft soil area
CN106837389A (en) * 2016-12-26 2017-06-13 北京城建集团有限责任公司 A kind of Underground Subway Station vertical shaft and transverse passage-way freeze water-stopping method
CN107288665A (en) * 2017-08-21 2017-10-24 中国建筑第八工程局有限公司 The construction method of Station
CN107575237A (en) * 2017-08-23 2018-01-12 广州地铁设计研究院有限公司 A kind of subsurface excavation method is combined the construction method of construction subway station with shield method
CN108005664A (en) * 2018-02-02 2018-05-08 北京市政建设集团有限责任公司 A kind of hole pile construction method of platform structure
CN108316931A (en) * 2018-03-05 2018-07-24 北京市政建设集团有限责任公司 A kind of branch-cut bridge section tunnel CRD method construction methods
CN108457656A (en) * 2018-03-05 2018-08-28 北京市政建设集团有限责任公司 A kind of unearthed method for tunnel construction

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Application publication date: 20120328