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CN-121976821-A - Tunnel reinforcing structure and construction method thereof

CN121976821ACN 121976821 ACN121976821 ACN 121976821ACN-121976821-A

Abstract

The application discloses a tunnel reinforcing structure and a construction method thereof, wherein the tunnel reinforcing structure is a reinforced concrete structure, the tunnel reinforcing structure is arranged on the inner side of the tunnel structure and extends along the longitudinal direction of a tunnel, the tunnel reinforcing structure is in a closed ring shape on the cross section of the tunnel, and a vault, a side wall and a bottom arch of the tunnel reinforcing structure are of an integrated structure. The tunnel reinforcing structure is in a closed ring shape, a complete reinforcing structure can be formed inside the tunnel structure, the arch crown, the side wall and the bottom arch of the tunnel reinforcing structure are integrated, the structural integrity is further enhanced, the bearing capacity of the tunnel reinforcing structure is greatly improved, and the whole structure is in a reinforced concrete structure, so that the corrosion resistance and the fire resistance of the structure are improved, and the bearing capacity of the structure is further ensured.

Inventors

  • Huang Huaining
  • ZHAO SHULIN
  • HUANG QIWU
  • LI YUANKAI
  • SUN QI
  • XUE RUJING
  • LI MINGGAN
  • SUN LIZHU
  • GAO XINCAI
  • LV LIANG
  • ZHANG WENYI
  • DU BO
  • WANG TING

Assignees

  • 北京市市政工程设计研究总院有限公司
  • 北京市轨道交通建设管理有限公司

Dates

Publication Date
20260505
Application Date
20260210

Claims (10)

  1. 1. The tunnel reinforcement structure is characterized in that the tunnel reinforcement structure (1) is a reinforced concrete structure, and the tunnel reinforcement structure (1) is arranged on the inner side of the tunnel structure (2) and extends along the longitudinal direction of the tunnel; The tunnel reinforcement structure (1) is in a closed ring shape on the cross section of a tunnel, and the arch crown, the side wall and the bottom arch of the tunnel reinforcement structure (1) are of an integrated structure.
  2. 2. Tunnel reinforcing structure according to claim 1, characterized in that the tunnel reinforcing structure (1) comprises circumferential reinforcement bars (3), which circumferential reinforcement bars (3) are arranged in the arch, side wall and bottom arch of the tunnel reinforcing structure (1) and have the same shape as the tunnel cross section.
  3. 3. Tunnel reinforcing structure according to claim 2, characterized in that the circumferential reinforcement (3) comprises an inner circumferential reinforcement (31), which inner circumferential reinforcement (31) is arranged away from the inner surface of the tunnel structure (2); and the outer circumferential reinforcing steel bars (32) are arranged close to the inner surface of the tunnel structure (2), and the outer circumferential reinforcing steel bars (32) are arranged in a closed mode.
  4. 4. A tunnel reinforcing structure according to claim 3, characterized in that the bottom arch of the tunnel reinforcing structure (1) comprises a non-sleeper region in which the inner circumferential reinforcement (31) is closed, so that the tunnel reinforcing structure (1) forms a complete structure inside the tunnel.
  5. 5. Tunnel reinforcing structure according to claim 4, characterized in that the bottom arch of the tunnel reinforcing structure (1) further comprises a sleeper zone in which the inner circumferential reinforcement (31) is arranged non-closed, the inner circumferential reinforcement (31) on both sides being anchored into the bottom arch of the tunnel reinforcing structure (1) so that the tunnel reinforcing structure (1) forms a complete structure inside the tunnel.
  6. 6. Tunnel reinforcement structure according to claim 4 or 5, characterized in that the bottom arch of the tunnel reinforcement structure (1) comprises: a drain (4), the drain (4) being arranged in the centre of the bottom arch; And the hidden beams (5) are arranged on two sides of the drainage ditch (4) and extend longitudinally along the tunnel on two sides of the sleeper area.
  7. 7. Tunnel reinforcing structure according to claim 4, characterized in that the bottom arch of the tunnel reinforcing structure (1) comprises additional bars (6), which additional bars (6) are symmetrically arranged in the non-sleeper areas in the bottom arch, both ends of the additional bars (6) being anchored into the hidden beams (5) and the bottom arch.
  8. 8. The tunnel reinforcement structure according to claim 5, characterized in that the bottom arch of the tunnel reinforcement structure (1) comprises an inner main rib (7), which inner main rib (7) is arranged in the sleeper area in the bottom arch, both ends of the inner main rib (7) being anchored in the side walls of the tunnel reinforcement structure (1) and intersecting the inner circumferential reinforcement (31).
  9. 9. A tunnel reinforcing structure according to claim 3, characterized in that the tunnel reinforcing structure (1) further comprises tie bars (8), which tie bars (8) are arranged parallel to the cross section of the tunnel for connecting the inner circumferential reinforcement bars (31) and the outer circumferential reinforcement bars (32) in one piece; longitudinal ribs (9), wherein the longitudinal ribs (9) are arranged in parallel along the longitudinal extension direction of the tunnel.
  10. 10. The construction method of the tunnel reinforcing structure is characterized by comprising the following steps: s1, chiseling an original ballast bed structure in a tunnel structure (2), reserving a steel rail (10), setting temporary supports for the steel rail (10), and laying a waterproof layer on the inner side of the tunnel structure (2); S2, arranging a temporary mounting bracket above a bottom arch of the tunnel structure (2), supporting a steel rail (10) and fixing a sleeper; S3, binding bottom arch steel bars of the tunnel reinforcing structure (1) and pouring concrete to form a bottom arch of the tunnel reinforcing structure (1); S4, removing the temporary mounting support in the step S2, and constructing a side wall and a top arch of the tunnel reinforcing structure (1) to form the tunnel reinforcing structure (1).

Description

Tunnel reinforcing structure and construction method thereof Technical Field The application relates to the field of tunnel reinforcement, in particular to a tunnel reinforcement structure and a construction method thereof. Background Tunnel engineering is used as an important infrastructure in traffic, municipal administration and underground space development, and is widely applied to the fields of urban rail transit, highways, railways, municipal pipe galleries and the like. Along with the acceleration of the urban process, the tunnel is mostly under the working conditions of large burial depth and complex surrounding environment, the tunnel structure is gradually degraded after long-term use, the situation of structural cracking and leakage and even the reduction of the bearing capacity of the tunnel structure occur, and secondly, the change of the underground water level and the surrounding engineering construction can lead the bearing capacity of the original tunnel structure to be far beyond the bearing capacity of the original tunnel structure. Currently, for tunnels with track bed structures arranged inside, reinforcement is generally performed by adding liners to side walls and vaults inside the tunnel. However, most of the inner lining is of a non-closed-loop structure, the whole stress is discontinuous, the bearing capacity is limited, and the vertical and horizontal loads born by the existing tunnel structure are difficult to effectively share. Meanwhile, the reinforcement mode is easily limited by the original ballast bed structure in the construction process, the construction space is limited, the stability of the reinforcement effect is insufficient under the complex load condition, and the requirement of long-term safe operation of a tunnel is difficult to meet. Therefore, how to provide a tunnel reinforcement structure with a high bearing capacity for a tunnel structure is a technical problem to be solved in the art. Disclosure of Invention In view of the above, the present application provides a tunnel reinforcing structure and a construction method thereof. According to a first aspect of the application, a tunnel reinforcement structure is provided, the tunnel reinforcement structure is a reinforced concrete structure, the tunnel reinforcement structure is arranged on the inner side of the tunnel structure and extends along the longitudinal direction of the tunnel, the tunnel reinforcement structure is in a closed ring shape on the cross section of the tunnel, and a vault, a side wall and a bottom arch of the tunnel reinforcement structure are integrated. Preferably, the tunnel reinforcing structure comprises circumferential steel bars which are arranged in the vault, the side wall and the bottom arch of the tunnel reinforcing structure and have the same shape as the cross section of the tunnel. Preferably, the circumferential reinforcement comprises an inner circumferential reinforcement which is arranged away from the inner surface of the tunnel structure, and an outer circumferential reinforcement which is arranged close to the inner surface of the tunnel structure and is in a closed arrangement. Preferably, the bottom arch of the tunnel reinforcing structure comprises a non-sleeper region, and the inner circumferential steel bars are arranged in a closed mode in the non-sleeper region, so that the tunnel reinforcing structure forms a complete structure inside a tunnel. Preferably, the bottom arch of the tunnel reinforcing structure comprises a sleeper area, the inner circumferential steel bars are arranged in a non-closed mode in the sleeper area, and the inner circumferential steel bars on two sides are anchored into the bottom arch of the tunnel reinforcing structure, so that the tunnel reinforcing structure forms a complete structure inside a tunnel. Preferably, the bottom arch of the tunnel reinforcement structure comprises a drainage ditch arranged at the center of the bottom arch, and hidden beams arranged at two sides of the drainage ditch and extending longitudinally along the tunnel at two sides of the sleeper area. Preferably, the bottom arch of the tunnel reinforcing structure further comprises additional steel bars symmetrically arranged in non-sleeper areas in the bottom arch, and both ends of the additional steel bars are anchored into the hidden beams and the bottom arch. Preferably, the bottom arch of the tunnel reinforcing structure further comprises an inner main rib, wherein the inner main rib is arranged in a sleeper area in the bottom arch, and two ends of the inner main rib are anchored into side walls of the tunnel reinforcing structure and are intersected with the inner circumferential steel bars. Preferably, the tunnel reinforcing structure further comprises tie bars which are arranged parallel to the cross section of the tunnel and used for connecting the inner circumferential steel bars and the outer circumferential steel bars into a whole, and longitudinal