A segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel

Abstract

The present invention discloses a segment support and reinforcement device for the construction of an existing shield tunnel entrance and exit passage opening, comprising a temporary concrete structural plate on the top of a track, a temporary concrete bottom longitudinal beam, a column one, a column two, a column three and a steel wedge, wherein the temporary concrete bottom longitudinal beam is arranged on the inner side of the bottom of the entrance and exit passage opening, a plurality of columns one and a plurality of columns two are respectively and longitudinally fixedly connected at their lower ends to the temporary concrete bottom longitudinal beam and the platform plate, the upper end is fixedly connected to the temporary concrete structural plate on the top of the track, the temporary concrete structural plate on the top of the track and the track top beam structure are an integrated structure, a plurality of columns three are longitudinally fixedly connected at their lower ends to the track top beam structure, the upper end is fixedly connected to an annular arc I-beam, the outer arc surface of the annular arc I-beam abuts against the annular segment, and the steel wedge is fixedly connected to the corner of the annular segment and the track top beam structure. The present invention avoids the influence of the entrance and exit passage opening construction on the construction of the existing shield tunnel structure, and ensures the safety of the existing shield tunnel segment opening construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of shield tunnel access passage opening construction reinforcement equipment, and relates to a segment support and reinforcement device for the opening construction of an existing shield tunnel access passage. Background Art

[0002] Currently, in super large and developed cities such as Shenzhen, Guangzhou, Beijing, and Shanghai, due to the rapid urban development and the rapid increase in social demands, during the construction of urban rail transit, it is inevitable that the government or other social institutions require the addition of stations to meet the rapidly growing traffic demands. The Shenzhen Rail Transit Line 14 started full-scale construction at the beginning of 2018 and is planned to be opened for operation by the end of 2022. At the beginning of 2020, the Tumor Hospital Station was added between the Dayun Station and the Baohe Station, about 3 kilometers away from the Dayun Station and about 3 kilometers away from the Baohe Station. Since the start time of the Tumor Hospital Station lagged behind by about two years, in order to meet the goal of synchronously opening the entire Shenzhen Metro Line 14, the order of the engineering implementation plan has changed partially. Currently, the on-track structure, platform slab, and track at the site have all been constructed. If temporary steel supports for the full cross-section are erected according to the original plan for segment opening, construction of the evacuation passage and the access passage, it will block the traffic in the tunnel, interrupt other construction operations, restrict the realization of the hot slide goal of the Shenzhen Metro Line 14, and easily cause damage or harm to the existing track, with a relatively high safety risk during construction. A support structure provided in a Chinese patent application (application number: 2021105943492) occupies a large space because it spans the entire segment space, affecting the operation of the rail vehicle and the power layout.

[0003] Therefore, it is imperative to improve the segment support and reinforcement structure for shield tunnel access passage opening construction. It is necessary to develop a new and effective temporary support structure solution to avoid and effectively protect the track operation area, prevent affecting the hot slide, and meet the requirements of the project for safety, quality, and construction period. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: to provide a segment support and reinforcement device for the opening construction of an existing shield tunnel access passage, so as to solve the problems in the prior art of avoiding damage and breakage of related structures of the existing shield tunnel due to segment opening construction under the construction conditions of the existing shield tunnel access passage opening, and ensuring the safety of segment opening construction.

[0005] The technical solution adopted by the present invention is as follows: A segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel, including a temporary concrete structural slab at the top of the track, a temporary concrete bottom longitudinal beam, a first column, a second column, a third column, steel wedge blocks, and a circumferential arc-shaped I-beam. The temporary concrete bottom longitudinal beam is arranged inside the bottom of the access passage opening. The lower ends of multiple first columns and multiple second columns are respectively longitudinally and spacedly fixedly connected to the temporary concrete bottom longitudinal beam and the platform slab, and the second columns are opposite to the side walls at the bottom of the platform slab. The upper ends of multiple first columns and multiple second columns are fixedly connected with a temporary concrete structural slab at the top of the track. The temporary concrete structural slab at the top of the track and the track top beam structure are cast into an integral track top beam and slab structure. The lower ends of multiple third columns are respectively longitudinally and spacedly fixedly connected to the track top beam structure and are located directly above the second columns, and the upper ends are fixedly connected with a circumferential arc-shaped I-beam. The outer arc surface of the circumferential arc-shaped I-beam abuts against the circular segment and is fixedly connected thereto. Multiple steel wedge blocks are evenly spaced and fixedly connected to the circular segment and the track top beam structure and are located at the corners formed by the circular segment and the track top beam structure.

[0006] Preferably, the first column, the second column, and the third column are all double-spliced I-beam columns. The upper and lower ends of the first column are respectively fixedly connected with a second steel plate and a first steel plate. The upper and lower ends of the second column are respectively fixedly connected with a fourth steel plate and a third steel plate. The lower end of the third column is fixedly connected with a fifth steel plate.

[0007] Preferably, an epoxy filling material II is filled between the contact surfaces of the circumferential arc-shaped I-beam and the circular segment.

[0008] Preferably, an epoxy filling material I is filled between the contact surfaces of the steel wedge block and the circular segment.

[0009] Preferably, both sides of the middle parts of multiple first columns are fixedly connected by two middle longitudinal connecting channel steel beams, and the inner sides near the bottom are fixedly connected by a bottom longitudinal connecting I-beam. The corresponding first column and the second column are fixedly connected by an I-beam connecting beam. The bottoms between adjacent two second columns are fixedly connected by an I-beam connecting beam between two columns. The middle parts and upper parts of multiple second columns are respectively fixedly connected by a middle longitudinal connecting I-beam and an upper longitudinal connecting I-beam.

[0010] Preferably, the middle and lower parts of multiple third columns are fixedly connected by a longitudinal connecting I-beam. The third column and the steel wedge block are fixedly connected by an upper-side I-beam connecting beam.

[0011] Preferably, the segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel further includes multiple segment longitudinal fastening channel steels, which are longitudinally fixedly connected to the circular segment and are circumferentially spaced and arranged between the third column and the steel wedge block.

[0012] Preferably, steel plate stiffeners I and II are fixedly connected to both sides of the connection between the above-mentioned circumferential arc-shaped I-beam and the third column respectively.

[0013] Advantages of the present invention: Compared with the prior art, the effects of the present invention are as follows:

[0014] 1) The present invention makes full use of the existing structure beam at the top of the track of the shield tunnel and the side wall at the bottom of the platform slab, and adds a temporary concrete structural slab at the top of the track and a temporary concrete bottom longitudinal beam of the structural slab at the top of the track that is cast integrally with the structure beam at the top of the track, forming a stable force support point on one side of the opening of the access passage. The new steel support structure system only forms an effective temporary support structure solution on one side of the opening of the access passage, avoiding and effectively protecting the track area, preventing any impact on the hot slide, effectively solving problems such as blocking the traffic in the tunnel, interrupting other construction operations, and being prone to damage or destruction to the existing track. The technology is safe and reliable, ensuring the construction period.

[0015] 2) The present invention forms the main columns in the way of double-piled steel sections, and uses reasonable sectionalization (realizing manual handling) of the steel sections for connection, thus forming a stable frame support structure, which is very suitable for the transportation and erection operations of structural members in relatively narrow spaces, greatly improving the construction safety and construction efficiency, shortening the construction period, and having remarkable economic benefits.

[0016] 3) By using two middle longitudinal connecting channel steel beams, bottom longitudinal connecting I-beams, I-beam connecting beams, I-beam connecting beams between two columns, middle longitudinal connecting I-beams and upper longitudinal connecting I-beams, the first column, the second column, the temporary concrete structural slab at the top of the track and the platform slab are connected into a stable support system I, and with the cooperation of the longitudinal connecting I-beams and the upper side I-beam connecting beams, the third column, the steel wedge blocks and the annular segments, and the structure beam at the top of the track are connected into a stable support system II, making the entire support system connected longitudinally and transversely to form a more stable frame system structure. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the present invention;

[0018] Figure 2 is the top view layout structural schematic diagram of the present invention;

[0019] Figure 3 is the structural schematic diagram of the connection of the third column. Detailed Embodiments

[0020] The present invention will be further introduced below in conjunction with specific embodiments.

[0021] Embodiment 1: As Figures 1-3 shown, for Figure 1The existing structure consists of the existing annular segment 1, the invert backfill 2 installed at the bottom of the annular segment, the track 3 installed on the invert backfill 2, the platform slab 26, the side wall 4 at the bottom of the platform slab, and the top beam structure 5. A concrete partition integrated with the top beam structure 5 is provided at the position of the top beam structure 5 opposite to the track 3. A segment support and reinforcement device for the opening construction of an existing shield tunnel access passage according to the present invention includes a temporary concrete top beam structure slab 6, a temporary concrete bottom longitudinal beam 7, a first column 9, a second column 12, a third column 16, a steel wedge block 17, and a circumferential arc-shaped I-beam 22. The temporary concrete bottom longitudinal beam 7 is arranged inside the bottom of the access passage opening 26. The lower ends of multiple first columns 9 and multiple second columns 12 are longitudinally and spacedly fixedly connected to the temporary concrete bottom longitudinal beam 7 and the platform slab 27 respectively, and the second column 12 is opposite to the side wall 4 at the bottom of the platform slab 27. The upper ends of multiple first columns 9 and multiple second columns 12 are fixedly connected with the temporary concrete top beam structure slab 6. The temporary concrete top beam structure slab 6 and the top beam structure 5 are cast into an integral top beam and slab structure and are flush with the lower end surface of the top beam structure 5. The lower ends of multiple third columns 16 are longitudinally and spacedly fixedly connected to the top beam structure 5 and are located directly above the second column 12. The upper ends are fixedly connected with the circumferential arc-shaped I-beam 22. The outer arc surface of the circumferential arc-shaped I-beam 22 abuts against the annular segment 1 and is fixedly connected thereto. Multiple steel wedge blocks 17 are used, which are evenly spaced and fixedly connected to the annular segment 1 and the top beam structure 5 and are located at the corner formed by the annular segment 1 and the top beam structure 5. It also includes multiple segment longitudinal fastening channel steels 24, which are longitudinally fixedly connected to the annular segment 1 and are circumferentially spaced between the third column 16 and the steel wedge block 17. The segments within the influence range around the segment demolition area are fastened by the segment longitudinal fastening channel steels 24 to ensure that the segments in the non-demolition area do not deform or shift. The distance between adjacent first columns and second columns is 1.5 m, the circumferential distance of the segment longitudinal fastening channel steels is 0.43 m. The temporary concrete bottom longitudinal beam 7 is connected to the segment by planting steel bars, the temporary concrete top beam structure slab 6 is fixedly connected to the segment by planting steel bars, and the segment longitudinal fastening channel steel is connected to the segment through a reserved sleeve using M16. The present invention makes full use of the existing shield tunnel top beam structure and the side wall at the bottom of the platform slab, and adds a temporary concrete top beam structure slab and a temporary concrete bottom longitudinal beam to form stable force support points. On this basis, a new type of steel support structure system is designed, which forms an effective temporary support structure scheme only on one side of the access passage opening, avoiding and effectively protecting the track area and preventing any impact on the hot slide, effectively solving problems such as blocking the traffic in the tunnel, interrupting other construction operations, and being likely to cause damage or injury to the existing track. The technology is safe and reliable, ensuring the construction period.

[0022] Preferably, the above-mentioned first column 9, second column 12, third column 16 and steel wedge block 17 all adopt double-rolled I-beam columns (that is, two I-beams are vertically spliced by welding to form a structure with a hollow interior). The upper and lower ends of the first column 9 are respectively fixedly connected with a second steel plate 8-2 and a first steel plate 8-1. The upper and lower ends of the second column 12 are respectively fixedly connected with a fourth steel plate 11-2 and a third steel plate 11-1. The lower end of the third column 16 is fixedly connected with a fifth steel plate 11-3. The top of the steel wedge block 17 is provided with an inclined plate that fits the segment, and the bottom is provided with a steel plate. The steel plate structure forms a flange structure, which is convenient for fixed connection. The double-rolled I-beam structure has better rigidity and strength and higher stability.

[0023] Preferably, an epoxy filling material two 23-2 is filled between the circumferential arc-shaped I-beam 22 and the contact surface of the annular segment 1; an epoxy filling material one 23-1 is filled between the steel wedge block 17 and the contact surface of the annular segment 1. The epoxy filling material one 23-1 and the epoxy filling material two 23-2 respectively fill their respective gaps and are filled densely to ensure effective force transmission.

[0024] Preferably, both sides of the middle of the above-mentioned multiple first columns 9 are fixedly connected by two middle longitudinal connecting channel steel beams 10, and the inner side near the bottom is fixedly connected by a bottom longitudinal connecting I-beam 13. The corresponding first column 9 and the second column 12 are fixedly connected by an I-beam connecting beam 25. The bottom between two adjacent second columns 12 is fixedly connected by an I-beam connecting beam 15 between two columns. The middle and upper parts of the multiple second columns 12 are respectively fixedly connected by a middle longitudinal connecting I-beam 14-1 and an upper longitudinal connecting I-beam 14-2; the middle and lower parts of the multiple third columns 16 are fixedly connected by a longitudinal connecting I-beam 19. The third column 16 and the steel wedge block 17 are fixedly connected by an upper-side I-beam connecting beam 18. The main types of steel structures are mainly connected into one body by welding and supplemented by high-strength bolts in some parts. The use of high-strength bolts for connection is convenient for installation and disassembly, and is also convenient for the demolition after the reinforcement treatment of the access opening is completed.

[0025] Preferably, on both sides of the connection between the circumferential arc-shaped I-beam 22 and the third column 16, a first steel plate stiffener 20 and a second steel plate stiffener 21 are respectively fixedly connected. The first steel plate stiffener 20 and the second steel plate stiffener 21 are used for structural support and strengthening to improve the rigidity and strength of the connection between the circumferential arc-shaped I-beam 22 and the third column 16, and make the support reliability better.

[0026] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel, characterized in that: It includes a temporary concrete structural slab at the rail top (6), a temporary concrete bottom longitudinal beam (7), a first column (9), a second column (12), a third column (16), steel wedge blocks (17), and a circumferential arc-shaped I-beam (22). The temporary concrete bottom longitudinal beam (7) is arranged on the inner side of the bottom of the access passage opening (26). The lower ends of multiple first columns (9) and multiple second columns (12) are longitudinally and fixedly connected to the temporary concrete bottom longitudinal beam (7) and the platform slab (27) at intervals respectively, and the second column (12) is opposite to the side wall (4) at the bottom of the platform slab (27). The upper ends of multiple first columns (9) and multiple second columns (12) are fixedly connected to the temporary concrete structural slab at the rail top (6). The temporary concrete structural slab at the rail top (6) and the rail top beam structure (5) are cast into an integral rail top beam and slab structure. The lower ends of multiple third columns (16) are longitudinally and fixedly connected to the rail top beam and slab structure at intervals respectively and are located directly above the second column (12). The upper ends are fixedly connected with a circumferential arc-shaped I-beam (22). The outer arc surface of the circumferential arc-shaped I-beam (22) abuts against the annular segment (1) and is fixedly connected to it. Multiple steel wedge blocks (17) are used, and they are evenly spaced and fixedly connected to the annular segment (1) and the rail top beam and slab structure and are located at the corners formed by the annular segment (1) and the rail top beam and slab structure; Both sides of the middle part of multiple first columns (9) are fixedly connected by two middle longitudinal connecting channel steel beams (10), and the inner side near the bottom is fixedly connected by a bottom longitudinal connecting I-beam (13). The corresponding first column (9) and the second column (12) are fixedly connected by an I-beam connecting beam (25). The bottoms between adjacent two second columns (12) are fixedly connected by an I-beam connecting beam between two columns (15). The middle part and the upper part of multiple second columns (12) are fixedly connected by a middle longitudinal connecting I-beam (14-1) and an upper longitudinal connecting I-beam (14-2) respectively. The middle and lower parts of multiple third columns (16) are fixedly connected by a longitudinal connecting I-beam (19). The third column (16) and the steel wedge block (17) are fixedly connected by an upper side I-beam connecting beam (18). It also includes multiple segment longitudinal fastening channel steels (24), and multiple segment longitudinal fastening channel steels (24) are longitudinally fixedly connected to the annular segment (1) and are arranged at circumferential intervals between the third column (16) and the steel wedge block (17). On both sides of the connection between the circumferential arc-shaped I-beam (22) and the third column (16), a first steel plate stiffener (20) and a second steel plate stiffener (21) are fixedly connected respectively.

2. The segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel according to claim 1, characterized in that: The first column (9), the second column (12), and the third column (16) are all double-spliced I-beam columns. The upper and lower ends of the first column (9) are fixedly connected with a second steel plate (8-2) and a first steel plate (8-1) respectively. The upper and lower ends of the second column (12) are fixedly connected with a fourth steel plate (11-2) and a third steel plate (11-1) respectively. The lower end of the third column (16) is fixedly connected with a fifth steel plate (11-3).

3. The segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel according to claim 1, characterized in that: An epoxy filling material two (23-2) is filled between the contact surfaces of the circumferential arc-shaped I-beam (22) and the annular segment (1).

4. The segment support and reinforcement device for the opening construction of the access passage of an existing shield tunnel according to claim 1, characterized in that: An epoxy filling material one (23-1) is filled between the contact surfaces of the steel wedge block (17) and the annular segment (1).

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