A shield tunnel segment lining structure suitable for building subways under narrow roads

Abstract

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 circular arc-shaped A-type segments are circumferentially assembled into an excellent arc-shaped A-type segment ring, and a plurality of circular arc-shaped B-type segments are circumferentially assembled into an excellent arc-shaped B-type segment ring, and the two types of 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

[0001] The invention relates to the technical field of shield tunnels, and in particular to a shield tunnel segment lining structure suitable for constructing subways under narrow roads. Background Art

[0002] Urban subways are being built vigorously. When selecting subway lines, in order to make the line direction consistent with the main passenger flow direction on the ground, subway tunnels are often built under the main roads of the city, and the shield method is often used. Subway shield tunnels are mostly double-line tunnels, usually with parallel left and right lines. However, in areas with narrow road red lines, in order to avoid certain underground buildings and structures, subway double-line tunnels will adopt upper and lower separated overlapping shield tunnels. This upper and lower overlapping shield tunnel is formed by shield machine excavation and assembly of pipe segments first and then forming a separated lower and upper tunnel structure. For example, Shenzhen Metro Line 2 and Line 3, Guangzhou Rail Transit Line 5, etc., have adopted this upper and lower separated overlapping shield tunnel in part or all of the subway section due to various restrictions.

[0003] Separate overlapping shield tunnels usually have the characteristics of small overlap clearance and long overlap distance. The construction sequence is: the lower tunnel is excavated first → interlayer soil grouting reinforcement → lower tunnel support protection → upper tunnel shield excavation → upper tunnel grouting reinforcement. There are many engineering difficulties and disadvantages in the construction of separate overlapping shield tunnels: (1) During the excavation of the upper tunnel, additional stress will be generated on the lower tunnel, causing deformation of the lower tunnel; (2) The unloading effect of the upper tunnel after construction may cause the lower tunnel to bulge; (3) The speed of the lower tunnel support must match the assembly speed of the upper tunnel, otherwise it will cause the tunnel to deform; (4) The vertical height of the construction process is large, which has a great impact on the stratum and upper buildings, and it is difficult to control ground settlement.

[0004] The Chinese patent application with application number 2016111595429 discloses an "upper and lower integrated shield tunnel segment lining structure", which assembles the upper tunnel segment ring and the lower tunnel segment ring through special-shaped connecting segments to form an "8"-shaped structural ring. This upper and lower integrated shield tunnel segment lining can replace the upper and lower separated overlapping shield tunnels. It has strong integrity, high strength, good bearing capacity, can effectively control ground subsidence, ensure the safety of surrounding buildings, and its construction difficulty is reduced and construction efficiency is improved. The problems are: the special-shaped connecting segments are large and bulky, with irregular shapes, which are difficult to manufacture molds and reinforce, which is not conducive to industrial mass production, and the four raised joints are easily damaged during transportation and installation. The bottom plate of the upper tunnel is raised and needs to be filled and leveled before it can be put into use, which reduces the available space. Summary of the invention

[0005] The object of the present invention is to provide a shield tunnel segment lining structure suitable for building a subway under a narrow road surface, which can

[0006] The embodiment of the present invention is achieved as follows:

[0007] A shield tunnel segment lining structure suitable for building a subway under a narrow road surface comprises: an A-type segment ring, a B-type segment ring and a middle plate, wherein the A-type segment ring and the B-type segment ring are respectively connected to two sides of the middle plate and together form an "8"-shaped integrated shield tunnel segment lining; a plurality of circular arc-shaped A-type segments are circumferentially assembled into a major arc-shaped A-type segment ring, a plurality of circular arc-shaped B-type segments are circumferentially assembled into a major arc-shaped B-type segment ring, the surface of the middle plate is straight and both ends are triangularly protruded, The a-type segment ring and the b-type segment ring are assembled with the two ends of the middle plate to form an "8"-shaped structural ring, which satisfies the central symmetry and axial symmetry; multiple structural rings are then assembled longitudinally to form an "8"-shaped integrated shield tunnel segment lining structure; when assembling multiple structural rings, the "8"-shaped structural ring is rotated 180° around the geometric center of the middle plate, 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 used alternately to achieve staggered assembly.

[0008] In a preferred embodiment of the present invention, the number of the above-mentioned A-type segments and B-type segments are not equal, 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°.

[0009] In a preferred embodiment of the present invention, the thickness of the above-mentioned A-type tube segment and B-type tube segment is the same, the middle plate and the A-type tube segment, the middle plate and the B-type tube segment are connected by multiple superior arc bent bolts, and the A-type tube segments and the B-type tube segments are connected by bent bolts respectively.

[0010] In a preferred embodiment of the present invention, the outer diameter of the ring of the above-mentioned 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 2.5-3.5m, the thickness is 0.2-0.4m, the length of the middle plate is 3-5m, and the width is 1-2m.

[0011] In a preferred embodiment of the present invention, the triangular protrusions at both ends of the middle plate have two flat cross sections, and the two ends of the a-type segment ring and the two ends of the b-type segment ring just match the two flat cross sections.

[0012] In a preferred embodiment of the present invention, the above-mentioned type A segment, type B segment and middle plate are respectively provided with a plurality of pin holes, the pin holes of the middle plate are arranged in at least two rows, and the pin holes of type A segment and type B segment are evenly distributed, so that on the type A segment ring and the type B segment ring, the central angle of two adjacent pin holes on the surface where the same major arc is located is 20° to 30°.

[0013] The beneficial effects of the present invention are:

[0014] According to the present invention, six A-type segments are circumferentially spliced ​​into an a-type segment ring by bent bolts, and four B-type segments are circumferentially spliced ​​into a b-type segment ring by bent bolts. The a-type segment ring and the b-type segment ring are respectively fixed to the middle plate by superior arc bent bolts, and the a-type segment ring and the b-type segment ring are staggered and assembled by exchanging the upper and lower positions of the a-type segment ring and the b-type segment ring. The present invention can improve the longitudinal rigidity of the tunnel structure and can more effectively control the uneven settlement of the tunnel. At the same time, the staggered assembly of the segment seams also reduces the deformation of the lining structure, makes the seams more tightly fitted, and can improve the waterproof performance of the entire segment lining structure.

[0015] The present invention also has the following advantages:

[0016] 1. The shield tunnel segment lining structure of the present invention is suitable for building subways under narrow roads. It needs to manufacture fewer types of segments, and the shape of the middle plate is simple and regular, which is easy to process, manufacture, transport and install. The upper tunnel floor and the lower tunnel roof are both flat, which can make full use of the space, reduce the tunnel excavation area and reduce the cost.

[0017] 2. The present invention is a shield tunnel segment lining structure suitable for building subways under narrow roads. It has two symmetry axes and reasonable force. The connecting surface between the A-type segment and the middle plate is perpendicular to the axis of the segment ring, which is conducive to the effective transfer of load.

[0018] 3. The shield tunnel segment lining structure of the present invention, which is suitable for building subways under narrow roads, removes the interlayer soil between the separate upper and lower overlapping shield tunnel structures. It has stronger integrity, more stable and firm structure, and can more effectively control ground settlement and ensure the safety of surrounding buildings.

[0019] Fourth, the upper and lower integrated shield tunnel structure of the present invention can be obtained by excavating once with a large shield machine and assembling once, which reduces the disturbance of the stratum during construction and has a smaller impact on the stratum, and can better control ground settlement. At the same time, it also improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0021] Figure 1 It is a top view analysis diagram of the structural ring of the present invention;

[0022] Figure 2 It is a top view of the structure of the middle plate of the present invention;

[0023] Figure 3 It is a three-dimensional diagram of the shield tunnel segment lining structure of the present invention;

[0024] Icons: 1. Type A segment; 2. Type B segment; 3. Middle plate; 4. Bent bolt; 5. Superior arc bent bolt; 6. Pin hole; R1, outer radius of shield tunnel; α, center angle of Type A segment; β, center angle of Type B segment; θ, center angle corresponding to adjacent bolt holes; L, length of middle plate; B, width of middle plate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] First embodiment

[0028] Please refer to Figure 1 The present embodiment provides a shield tunnel segment lining structure suitable for constructing a subway under a narrow road surface, which includes: an a-type segment ring, a b-type segment ring and a middle plate 3. The a-type segment ring includes a plurality of annularly assembled A-type segments 1, and the b-type segment ring includes a plurality of annularly assembled B-type segments 2. The a-type segment ring and the b-type segment ring respectively form an arc-shaped annular structure on both sides of the middle plate 3. The two ends of the middle plate 3 respectively match the a-type segment 1 and the B-type segment 2 and have a flat connection surface. The a-type segment 1, the B-type segment 2 and the middle plate 3 are connected to form an "8"-shaped structural ring. Multiple sections of the structural rings are connected to form an integrated shield tunnel segment lining. The a-type segment rings and the b-type segment rings of adjacent sections of the structural rings are arranged in staggered intervals in the upper and lower positions. When multiple "8"-shaped structural rings are assembled, the structural rings with "a" on the top and "b" on the bottom are used alternately with the structural rings with "b" on the top and "a" on the bottom to achieve staggered assembly.

[0029] Please refer to Figure 2The number of type A segments 1 and type B segments 2 is not equal. The type A segment ring includes 6 type A segments 1, and the type B segment ring includes 4 type B segments 2. The center angle of the type A segment 1 is α, α=48°46′12″, and the center angle of the type B segment 2 is β, β=73°9′18″. The major arc angle formed by the circumferential splicing of the 6 type A segments is the same as the major arc angle formed by the circumferential splicing of the 4 type B segments, and is equal to 292°37′12″, so that the structure formed by the circumferential splicing of the type A segments and the structure formed by the circumferential splicing of the type B segments are symmetrical about the axis and the center of the middle plate 3; the thickness of the type A segment 1 and the type B segment 2 are the same, and the outer diameter of the ring of the type A segment 1 and the outer diameter of the ring of the type B segment 2 are the same. The outer diameter of the ring is 3m, that is, the outer radius R1 of the shield tunnel is 3m, and the thickness is 0.3m. The A-type segment 1, the B-type segment 2 and the middle plate 3 are respectively provided with a plurality of latch holes 6. The A-type segment 1 is provided with 2 latch holes 6, and the B-type segment 2 is provided with 3 latch holes 6. The latch holes 6 of the middle plate 3 are arranged in two rows, 4 in each row, for a total of 8. The latch holes 6 of the A-type segment 1 and the B-type segment 2 are evenly distributed, so that on the a-type segment ring and the b-type segment ring, the central angle of two adjacent latch holes 6 on the same major arc surface is θ, θ=24°23′6″. The arrangement of the latch holes 6 enables the adjacent middle plates 3 to be fixed together by latches, and the a-type segment rings and b-type segment rings spaced apart from each other are butted. When connected in phase, the latch hole 6 of the A-type segment 1 is opposite to the latch hole 6 of the adjacent B-type segment 2, and they are matched and connected exactly; the surface of the middle plate 3 is straight and the two ends are triangularly protruded. The triangular protrusions at the two ends of the middle plate 3 have two plane sections. The two ends of the a-type segment ring and the two ends of the b-type segment ring just match each other, that is, the two ends of the middle plate 3 are just matched and connected with the ends of the A-type segment 1 and the B-type segment 2. The length L of the middle plate 3 is 4m, and the width B is 1.5m. The middle plate 3 and the A-type segment 1, and the middle plate 3 and the B-type segment 2 are connected respectively by a plurality of superior arc bent bolts 5. In this embodiment, three superior arc bent bolts 5 connect one end of the A-type segment 1 with the middle plate 3, three superior arc bent bolts 5 connect one end of another A-type segment 1 with the other end of the middle plate 3, the connection method of the B-type segment 2 and the middle plate 3 is the same as that of the A-type segment 1, the adjacent A-type segments 1 and the adjacent B-type segments 2 are connected by bent bolts 4, and bent holes are respectively arranged at the edges of the A-type segment 1 and the B-type segment 2. The A-type segment 1 is provided with a total of 6 bent holes, 3 of which are respectively arranged at the edge of the A-type segment 1 in a group, and the adjacent A-type segments 1 are fixedly connected by passing the bent bolts 4 through the bent holes. The B-type segment 2 is provided with a total of 6 bent holes, 3 of which are respectively arranged at the edge of the B-type segment 2 in a group, and the adjacent B-type segments 2 are fixedly connected by passing the bent bolts 4 through the bent holes.

[0030] Please refer to Figure 3The a-type segment ring and the b-type segment ring are assembled with the 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 located on both sides of the middle plate 3, and the structural ring satisfies the central symmetry and axial symmetry. Multiple structural rings are then longitudinally assembled to form an "8"-shaped integrated shield tunnel segment lining structure. When multiple structural rings are assembled, the "8"-shaped structural ring is rotated 180° 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 used alternately to achieve staggered assembly.

[0031] To sum up, the six A-type segments in the embodiment of the present invention are circumferentially spliced ​​into an a-type segment ring by bent bolts, and the four B-type segments are circumferentially spliced ​​into a b-type segment ring by bent bolts. The a-type segment ring and the b-type segment ring are respectively fixed to the middle plate by superior arc bent bolts, and the a-type segment ring and the b-type segment ring are staggered and assembled by interchangeably interchanging the upper and lower positions. The present invention can improve the longitudinal stiffness of the tunnel structure and can more effectively control the uneven settlement of the tunnel. At the same time, the staggered assembly of the segment seams also reduces the deformation of the lining structure, and the joints are more tightly fitted, which can improve the waterproof performance of the entire segment lining structure.

[0032] This specification describes examples of embodiments of the present invention, and does not mean that these embodiments illustrate and describe all possible forms of the present invention. Those of ordinary skill in the art will appreciate that the embodiments described herein are to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such special statements and embodiments. Those of ordinary skill in the art can make various other various specific variations and combinations that do not deviate from the essence of the present invention based on these technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A shield tunnel segment lining structure suitable for building a subway under a narrow road surface, characterized in that: include: A-type segment ring, b-type segment ring and middle plate (3), the a-type segment ring and b-type segment ring are respectively connected to both sides of the middle plate (3) and together form an "8"-shaped integrated shield tunnel segment lining; a plurality of arc-shaped A-type segments (1) are circumferentially assembled into an a-type segment ring of a major arc shape, and a plurality of arc-shaped B-type segments (2) are circumferentially assembled into a b-type segment ring of a major arc shape; the surface of the middle plate (3) is straight and has triangular protrusions at both ends; the a-type segment ring and b-type segment ring are assembled with the two ends of the middle plate (3) to form an "8"-shaped structural ring, and the structural ring satisfies central symmetry and axial symmetry; the plurality of structural rings are then longitudinally assembled to form an "8"-shaped integrated shield tunnel segment lining structure; When assembling a plurality of structural rings, 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 used alternately to achieve staggered assembly; The number of the A-type segments (1) and the number of the B-type segments (2) are different; the center angle of the A-type segments (1) is 45° to 50°, and the center angle of the B-type segments (2) is 70° to 80°.

2. The shield tunnel segment lining structure suitable for building a subway under a narrow road surface according to claim 1 is characterized in that: The thickness of the A-type segments (1) and the B-type segments (2) are the same; the middle plate (3) and the A-type segments (1), and the middle plate (3) and the B-type segments (2) are connected via a plurality of superior arc-shaped bent bolts (5); and the A-type segments (1) and the B-type segments (2) are connected via bent bolts (4).

3. The shield tunnel segment lining structure suitable for building a subway under a narrow road surface according to claim 1 is characterized in that: The outer diameter of the A-type segment (1) and the outer diameter of the B-type segment (2), that is, the outer radius of the shield tunnel, is 2.5 to 3.5 m, and the thickness is 0.2 to 0.4 m. The length of the middle plate (3) is 3 to 5 m, and the width is 1 to 2 m.

4. The shield tunnel segment lining structure suitable for building a subway under a narrow road surface according to claim 1 is characterized in that: The triangular protrusions at both ends of the middle plate (3) have two plane sections, and the two ends of the a-type segment ring and the two ends of the b-type segment ring just match the two plane sections.

5. The shield tunnel segment lining structure suitable for building a subway under a narrow road surface according to claim 1 is characterized in that: The A-type segment (1), the B-type segment (2) and the middle plate (3) are respectively provided with a plurality of pin holes, the pin holes of the middle plate (3) are arranged in at least two rows, and the pin holes of the A-type segment (1) and the B-type segment (2) are evenly distributed, so that on the A-type segment ring and the B-type segment ring, the central angle of two adjacent pin holes on the same major arc surface is 20° to 30°.

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