CN110529145B - A shield tunnel segment lining structure suitable for building subways under narrow roads - Google Patents
A shield tunnel segment lining structure suitable for building subways under narrow roads Download PDFInfo
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- CN110529145B CN110529145B CN201910931270.7A CN201910931270A CN110529145B CN 110529145 B CN110529145 B CN 110529145B CN 201910931270 A CN201910931270 A CN 201910931270A CN 110529145 B CN110529145 B CN 110529145B
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- 238000010276 construction Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 description 9
- 210000001503 joint Anatomy 0.000 description 5
- 230000005641 tunneling Effects 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
- E21D11/083—Methods or devices for joining adjacent concrete segments
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
本发明公开了一种适用于窄路面下修建地铁的盾构隧道管片衬砌结构，包括a型管片环、b型管片环和中板，a型管片环、b型管片环和中板构成“8”字型的一体式盾构隧道管片衬砌结构，多个圆弧形的A型管片环向拼装成优弧型的a型管片环，多个圆弧形的B型管片环向拼装成优弧型的b型管片环，两种管片环通过表面平直、两端呈三角状凸起的中板拼装形成“8”字型的结构环，此结构环满足中心对称和轴对称，多个结构环再纵向拼装形成“8”字型的一体式盾构隧道管片衬砌结构；该种上下一体式盾构隧道管片衬砌，形式简单、加工制作简便、施工方便、整体性强、强度高，承载能力好，能有效控制地面沉降、保证周边建构筑物的安全、施工效率提高。
The invention discloses a shield tunnel segment lining structure suitable for building a subway under a narrow road surface, comprising an A-type segment ring, a B-type segment ring and a middle plate, wherein the A-type segment ring, the B-type segment ring and the middle plate constitute an "8"-shaped integrated shield tunnel segment lining structure, wherein a plurality of arc-shaped A-type segments are circumferentially assembled into an arc-shaped A-type segment ring, and a plurality of arc-shaped B-type segments are circumferentially assembled into an arc-shaped B-type segment ring, and the two segment rings are assembled through a middle plate with a straight surface and triangular protrusions at both ends to form an "8"-shaped structural ring, and the structural ring meets central symmetry and axial symmetry, and a plurality of structural rings are longitudinally assembled to form an "8"-shaped integrated shield tunnel segment lining structure; the upper and lower integrated shield tunnel segment lining has a simple form, is easy to process and manufacture, is convenient to construct, has a strong integrity, is high in strength, has a good bearing capacity, can effectively control ground settlement, ensure the safety of surrounding buildings and structures, and improve construction efficiency.
Description
Technical Field
The invention relates to the technical field of shield tunnels, in particular to a shield tunnel segment lining structure suitable for constructing subways under narrow roads.
Background
When the urban subway is built vigorously and the subway is selected, a subway tunnel is often built below an urban main road in order to ensure that the line trend is consistent with the main passenger flow direction on the ground, and a shield method is adopted mostly. The subway shield tunnel is mostly a double-line tunnel, and is usually a tunnel with parallel left and right lines. However, in a region with a narrow red line of a road, in order to avoid certain underground buildings and structures, the subway double-line tunnel adopts an up-down separated overlapped shield tunnel. The upper and lower overlapped shield tunnel is formed by tunneling and excavating a shield machine, assembling duct pieces and then forming a lower tunnel structure and an upper tunnel structure which are separated. For example, shenzhen subway No. 2 line, shenzhen railway No. 3 line, guangzhou railway traffic No. 5 line and the like are limited by various conditions, and the vertically separated overlapped shield tunnels are adopted in the subway section partially or completely.
The up-down separated overlapped shield tunnel is characterized by small overlapped clear distance, long overlapped distance and the like, and the construction sequence comprises the steps of tunneling the off-line tunnel, grouting reinforcement of an interlayer soil body, supporting protection of a support of the off-line tunnel, tunneling of the on-line tunnel shield and grouting reinforcement of the on-line tunnel. The separate overlapped shield tunnel has many engineering difficulties and defects in the construction process, namely (1) additional stress is generated on the lower tunnel in the tunneling process of the upper tunnel, so that the lower tunnel is deformed, (2) the unloading effect after the construction of the upper tunnel possibly causes the lower tunnel to bulge, (3) the supporting speed of the lower tunnel bracket is matched with the assembling speed of the upper tunnel, otherwise, the tunnel is deformed, and (4) the vertical height in the construction process is large, the influence on the stratum and the upper building is large, and the ground subsidence control is difficult.
The Chinese patent application with the application number 2016111595429 discloses an 'up-down integrated shield tunnel segment lining structure', which is used for assembling an upper tunnel segment ring and a lower tunnel segment ring through special-shaped connecting segments to form an '8' -shaped structural ring, and the up-down integrated shield tunnel segment lining can replace an up-down separated overlapped shield tunnel, has the advantages of strong integrity, high strength and good bearing capacity, can effectively control ground subsidence, ensures the safety of surrounding building structures, reduces construction difficulty and improves construction efficiency. The special-shaped connecting duct piece has the problems that the special-shaped connecting duct piece is huge and heavy, the shape is irregular, certain difficulty is brought to the aspects of mould manufacture and reinforcement, the industrialized mass production is not facilitated, and the joints of the four bulges are easy to damage in the process of transportation and installation. The bottom plate of upper portion tunnel is protruding, needs to fill the flattening rear and can put into use, has reduced usable space.
Disclosure of Invention
The invention aims to provide a shield tunnel segment lining structure suitable for constructing subways under narrow roads, which can be used for constructing subways
Embodiments of the present invention are implemented as follows:
A shield tunnel segment lining structure suitable for subway construction under narrow road surfaces comprises an a segment ring, a B segment ring and a middle plate, wherein the a segment ring and the B segment ring are respectively connected to two sides of the middle plate and form an 8-shaped integral shield tunnel segment lining, a plurality of arc-shaped A segment rings are assembled in a circumferential direction to form an arc-shaped a segment ring, a plurality of arc-shaped B segment rings are assembled in a circumferential direction to form an arc-shaped B segment ring, the surfaces of the middle plate are flat and the two ends of the middle plate are triangular protrusions, the a segment ring and the B segment ring are assembled with the two ends of the middle plate to form 8-shaped structural rings, the structural rings meet central symmetry and axial symmetry, the 8-shaped structural rings are longitudinally assembled to form the 8-shaped integral shield tunnel segment lining structure, and when the structural rings are assembled, the 8-shaped structural rings are rotated 180 degrees around the geometric center of the middle plate, so that the upper position and the lower position of the a segment ring and the B segment ring are interchanged, and the B segment ring are alternately used, and staggered joint assembly is realized.
In a preferred embodiment of the present invention, the number of the a-type segment and the B-type segment is different, the central angle of the a-type segment is 45 ° to 50 °, and the central angle of the B-type segment is 70 ° to 80 °.
In the preferred embodiment of the invention, the thickness of the A-type duct piece and the B-type duct piece is the same, the middle plate and the A-type duct piece and the middle plate and the B-type duct piece are connected through a plurality of excellent arc-shaped bent bolts, and the A-type duct piece and the B-type duct piece are respectively connected through the bent bolts.
In a preferred embodiment of the present invention, the outer diameter of the ring of the a-type segment and the outer diameter of the ring of the B-type segment, that is, the outer radius of the shield tunnel is 2.5-3.5 m, the thickness is 0.2-0.4 m, the length of the middle plate is 3-5 m, and the width is 1-2 m.
In a preferred embodiment of the present invention, the triangular protrusions at two ends of the middle plate have two flat cross sections, and two ends of the a-type segment ring and two ends of the b-type segment ring are exactly matched with the two flat cross sections.
In a preferred embodiment of the present invention, the a-type segment, the B-type segment, and the middle plate are respectively provided with a plurality of pin holes, the pin holes of the middle plate are at least two rows, and the pin holes of the a-type segment and the B-type segment are uniformly distributed, so that the central angles of two adjacent pin holes on the same major arc surface on the a-type segment ring and the B-type segment ring are 20 ° to 30 °.
The beneficial effects of the invention are as follows:
the invention can improve the longitudinal rigidity of the tunnel structure, can more effectively control the uneven settlement of the tunnel, and meanwhile, the staggered joint assembly of the pipe piece joints also reduces the deformation of the lining structure, enables the joints to be more clung, and can improve the waterproof performance of the whole pipe piece lining structure.
The invention also has the following advantages:
1. The shield tunnel segment lining structure is suitable for constructing subways under narrow roads, has few types of segments to be manufactured, has a simple and regular middle plate shape, and is easy to process, manufacture, transport and install. The upper tunnel bottom plate and the lower tunnel top plate are flat, so that the space can be fully utilized, the tunnel excavation area is reduced, and the manufacturing cost is reduced.
2. The shield tunnel segment lining structure suitable for constructing subways under narrow roads has two symmetrical shafts, is reasonable in stress, and the connecting surface of the A-shaped segment and the middle plate is perpendicular to the segment ring axis line, so that effective load transmission is facilitated.
3. The shield tunnel segment lining structure suitable for constructing subways under narrow roads removes interlayer soil between separated upper and lower overlapped shield tunnel structures, has stronger integrity and more stable and firm structure, can more effectively control ground subsidence and ensures the safety of surrounding structures.
4. After the large-scale shield tunneling machine is excavated once, the vertical integrated shield tunnel structure can be obtained through one-time assembly and forming, compared with the two-time excavation and two-time assembly, the disturbance of construction on stratum is reduced, the influence of construction on stratum is small, and the ground subsidence can be controlled better. Meanwhile, the construction efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be considered as limiting the scope.
FIG. 1 is a top view analysis of a structural ring of the present invention;
FIG. 2 is a top view of a midplane of the invention;
FIG. 3 is a perspective view of a shield tunnel segment lining structure of the present invention;
The icons comprise a type 1 segment, a type A segment, a type 2 segment, a type B segment, a middle plate, a type 4 segment, a bent bolt, a type 5 segment, a major arc bent bolt, a type 6 segment, a bolt hole, a type R 1 segment, a shield tunnel outer radius, an alpha segment central angle, a type A segment central angle, a type beta segment central angle, a type B segment central angle, a corresponding central angle of a theta segment and an adjacent bolt hole, a type L segment length, a type middle plate length, a type B segment width, and a type middle plate width.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
First embodiment
Referring to fig. 1, this embodiment provides a shield tunnel segment lining structure suitable for constructing subways under narrow roads, which includes: the a-type duct piece ring, the B-type duct piece ring and the middle plate 3, the a-type duct piece ring comprises a plurality of A-type duct pieces 1 assembled in a circumferential direction, the B-type duct piece ring comprises a plurality of B-type duct pieces 2 assembled in a circumferential direction, the a-type duct piece ring and the B-type duct piece ring respectively form a major arc annular structure on two sides of the middle plate 3, two ends of the middle plate 3 are respectively matched with the A-type duct pieces 1 and the B-type duct pieces 2 and are provided with flat connecting surfaces, the A-type duct pieces 1, the B-type duct pieces 2 and the middle plate 3 are connected to form an 8-shaped structural ring, the multi-section structural ring is connected to form an integral shield tunnel duct piece lining, the a-type duct piece ring and the B-type duct piece ring of the adjacent section structural rings are arranged at staggered intervals at upper and lower positions, and the structural ring of the upper part 'a' lower part 'B' is alternately used when the plurality of 8-shaped structural rings are assembled, so that staggered joints are realized.
Referring to fig. 2, the number of a-type duct pieces 1 and B-type duct pieces 2 is unequal, the a-type duct piece ring comprises 6 a-type duct pieces 1, the B-type duct piece ring comprises 4B-type duct pieces 2, wherein the central angle of the a-type duct piece 1 is α, α=48° 46'12 ", the central angle of the B-type duct piece 2 is β, β=73° 9' 18", and the major arc angle formed by the annular splicing of the 6 a-type duct pieces is the same as the major arc angle formed by the annular splicing of the 4B-type duct pieces, and is equal to 292 ° 37'12 ", so that the structure formed by the annular splicing of the a-type duct pieces and the structure formed by the annular splicing of the B-type duct pieces are axisymmetric and centrosymmetric with respect to the middle plate 3; the thicknesses of the A-type duct piece 1 and the B-type duct piece 2 are the same, the outer diameters of the A-type duct piece 1 and the B-type duct piece 2 are respectively 3m, namely the outer radius R 1 of the shield tunnel is 3m, the thickness is 0.3m, the A-type duct piece 1, the B-type duct piece 2 and the middle plate 3 are respectively provided with a plurality of bolt holes 6, the A-type duct piece 1 is provided with 2 bolt holes 6, the B-type duct piece 2 is provided with 3 bolt holes 6, the bolt holes 6 of the middle plate 3 are in two rows, 4 bolt holes of each row are totally 8, the bolt holes 6 of the A-type duct piece 1 and the B-type duct piece 2 are uniformly distributed, so that the central angles of two adjacent bolt holes 6 on the same major arc are theta, theta = 24 DEG 23'6'', the arrangement of the bolt holes 6 is realized, when the adjacent middle plates 3 are fixed together through bolts, the a-type duct piece rings and the B-type bolt rings which are mutually spaced are in butt joint, the holes 6 of the A-type duct piece 1 are in a-type duct piece and the adjacent B-type duct piece 2 are in a spacing manner, the two opposite triangular cross sections of the two opposite flat cross sections of the two opposite to each other 3 are in a triangular shape and the two flat cross section of the middle plate 3 is just in a flat shape and the flat cross section, the two ends of the a-type duct piece ring and the two ends of the B-type duct piece ring are exactly matched with two flat sections, namely, the two ends of the middle plate 3 are exactly matched with the ends of the A-type duct piece 1 and the B-type duct piece 2, the length L of the middle plate 3 is 4m, the width B is 1.5m, the middle plate 3 and the A-type duct piece 1 and the middle plate 3 and the B-type duct piece 2 are respectively connected through a plurality of excellent arc-shaped bending bolts 5, in the embodiment, one end of the A-type duct piece 1 is connected with one end of the middle plate 3 through 3 excellent arc-shaped bending bolts 5, one end of the other A-type duct piece 1 is connected with the other end of the middle plate 3 through 3 excellent arc-shaped bending bolts 5, the B-type duct piece 2 is connected with the A-type duct piece 1 through bending bolts 4, the adjacent A-type duct piece 1 and the adjacent B-type duct piece 2 are respectively connected through 6 bending bolts 4, and the edges of the A-type duct piece 1 and the B-type duct piece 2 are respectively connected through 6 bending bolts, and the adjacent A-type duct piece 1 and the B-type duct piece 2 are respectively fixedly connected through the bending bolts 2 through the bending bolts, and the adjacent duct piece 2 is fixedly connected with the adjacent through the B-type duct piece 2 and the B-type duct piece 2 through the bending bolts, and the adjacent through the duct piece is fixedly arranged through the duct piece and the duct piece.
Referring to fig. 3, the a-type segment ring and the b-type segment ring are assembled with two ends of the middle plate 3 to form an 8-shaped structural ring, wherein the a-type segment ring and the b-type segment ring are respectively positioned at two sides of the middle plate 3, the structural rings meet the central symmetry and the axial symmetry, the plurality of structural rings are longitudinally assembled to form an 8-shaped integral shield tunnel segment lining structure, and when the plurality of structural rings are assembled, the 8-shaped structural ring is rotated 180 degrees around the geometric center of the middle plate 3, so that the upper and lower positions of the a-type segment ring and the b-type segment ring are interchanged, and the a-type segment ring and the b-type segment ring are alternately used to realize staggered joint assembly.
In summary, 6A-type duct pieces are annularly spliced into an a-type duct piece ring through bent bolts, 4B-type duct pieces are annularly spliced into a B-type duct piece ring through bent bolts, the a-type duct piece ring and the B-type duct piece ring are respectively fixed on a middle plate through excellent arc-shaped bent bolts, and the upper and lower positions of the a-type duct piece ring and the B-type duct piece ring are mutually staggered and spliced, so that the longitudinal rigidity of a tunnel structure can be improved, the uneven settlement of a tunnel can be more effectively controlled, and meanwhile, the staggered seam splicing of duct piece seams reduces the deformation of a lining structure, the seams are more closely attached, and the waterproof performance of the whole duct piece lining structure can be improved.
This description describes examples of embodiments of the invention and is not intended to illustrate and describe all possible forms of the invention. Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (5)
1. A shield tunnel segment lining structure suitable for constructing subways under narrow roads is characterized by comprising an a-type segment ring, a B-type segment ring and a middle plate (3), wherein the a-type segment ring and the B-type segment ring are respectively connected to two sides of the middle plate (3) and form an 8-shaped integral shield tunnel segment lining structure, a plurality of circular arc-shaped A-type segments (1) are assembled annularly to form a major arc-shaped a-type segment ring, a plurality of circular arc-shaped B-type segments (2) are assembled annularly to form a major arc-shaped B-type segment ring, the surfaces of the middle plate (3) are flat and are protruded in triangular shapes at two ends, the a-type segment ring and the B-type segment ring are assembled with two ends of the middle plate (3) to form an 8-shaped structural ring, the structural ring meets the central symmetry and the axial symmetry, and the 8-shaped structural rings are longitudinally assembled to form the 8-shaped integral shield tunnel segment lining structure;
The number of the A-type duct pieces (1) and the number of the B-type duct pieces (2) are different, the central angle of the A-type duct pieces (1) is 45-50 degrees, and the central angle of the B-type duct pieces (2) is 70-80 degrees.
2. The shield tunnel segment lining structure suitable for subway construction under narrow pavement according to claim 1, wherein the thicknesses of the A-type segment (1) and the B-type segment (2) are the same, the middle plate (3) and the A-type segment (1) and the middle plate (3) and the B-type segment (2) are connected through a plurality of excellent arc-shaped bent bolts (5), and the A-type segment (1) and the B-type segment (2) are connected through bent bolts (4) respectively.
3. The shield tunnel segment lining structure suitable for subway construction under narrow pavement according to claim 1, wherein the ring outer diameter of the A-type segment (1) and the ring outer diameter of the B-type segment (2), namely the outer radius of the shield tunnel, are 2.5-3.5 m, the thickness is 0.2-0.4 m, the length of the middle plate (3) is 3-5 m, and the width is 1-2 m.
4. The shield tunnel segment lining structure suitable for constructing subways under narrow roads according to claim 1 is characterized in that triangular protrusions at two ends of the middle plate (3) are provided with two flat cross sections, and two ends of the a-type segment ring and two ends of the b-type segment ring are exactly matched with the two flat cross sections.
5. The shield tunnel segment lining structure suitable for constructing subways under narrow roads according to claim 1 is characterized in that a plurality of bolt holes are respectively formed in an A-type segment (1), a B-type segment (2) and a middle plate (3), at least two rows of bolt holes are formed in the middle plate (3), and the bolt holes of the A-type segment (1) and the B-type segment (2) are uniformly distributed, so that the central angles of two adjacent bolt holes on the same major arc are 20-30 degrees on an a-type segment ring and a B-type segment ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910931270.7A CN110529145B (en) | 2019-09-29 | 2019-09-29 | A shield tunnel segment lining structure suitable for building subways under narrow roads |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910931270.7A CN110529145B (en) | 2019-09-29 | 2019-09-29 | A shield tunnel segment lining structure suitable for building subways under narrow roads |
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| CN110529145A CN110529145A (en) | 2019-12-03 |
| CN110529145B true CN110529145B (en) | 2025-03-04 |
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| CN118881125A (en) * | 2024-09-29 | 2024-11-01 | 中铁九局集团第四工程有限公司 | Box-type concrete assembled rail-top air duct and construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003138897A (en) * | 2001-11-06 | 2003-05-14 | Ohbayashi Corp | Tunnel and its construction method |
| CN210660118U (en) * | 2019-09-29 | 2020-06-02 | 中建地下空间有限公司 | A shield tunnel segment lining structure suitable for subway construction under narrow road surface |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2821561B2 (en) * | 1990-04-27 | 1998-11-05 | 清水建設株式会社 | Compound section shield tunnel segment |
| CN104747207B (en) * | 2015-03-25 | 2017-02-22 | 中铁工程装备集团有限公司 | Mid-partition rectangular tunnel segmental lining and segment splicing method |
| CN106437758B (en) * | 2016-12-15 | 2018-10-19 | 西南交通大学 | Upper and lower integral type shield tunnel segment lining structure |
| CN109736833A (en) * | 2019-01-31 | 2019-05-10 | 沈阳建筑大学 | Double circular shield structure to create a storage-type multi-functional deep tunnel |
| CN210509195U (en) * | 2019-09-26 | 2020-05-12 | 西南交通大学 | A highway shield tunnel structure for two-way four lanes |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003138897A (en) * | 2001-11-06 | 2003-05-14 | Ohbayashi Corp | Tunnel and its construction method |
| CN210660118U (en) * | 2019-09-29 | 2020-06-02 | 中建地下空间有限公司 | A shield tunnel segment lining structure suitable for subway construction under narrow road surface |
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