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CN-122014267-A - Shield receiving method

CN122014267ACN 122014267 ACN122014267 ACN 122014267ACN-122014267-A

Abstract

The application discloses a shield receiving method which comprises the steps of constructing a subsurface tunnel, constructing a front blocking wall at the front part of the subsurface tunnel, constructing a rear blocking structure at the rear part of the subsurface tunnel, forming a cavity between the front blocking wall and the rear blocking structure, and filling materials into the cavity for receiving a shield machine. According to the shield receiving method provided by the application, a closed filling area can be created, and the pressure balance is realized after the shield machine is driven into the area, so that the safety and the reliability of shield receiving are ensured.

Inventors

  • LV LIANG
  • CAO LEYU
  • ZHANG HENGYI
  • BAO KAI
  • WANG FUQIANG
  • ZHANG ZHAO
  • LI MINGGAN
  • GAO XINCAI
  • DU BO
  • QIAO FENG
  • LIU LI
  • LIU CHANG

Assignees

  • 北京市市政工程设计研究总院有限公司

Dates

Publication Date
20260512
Application Date
20260210
Priority Date
20251201

Claims (12)

  1. 1. The shield receiving method is characterized by comprising the following steps: Constructing a subsurface tunnel (1), wherein the subsurface tunnel (1) is aligned along the travelling direction of the shield tunnel (2); Constructing a front plugging wall (3) at the front part (1 a) of the undercut tunnel (1); constructing a rear blocking structure (5) at the rear part (1 b) of the undercut tunnel (1), so that a cavity (4) is formed between the front blocking wall (3) and the rear blocking structure; Filling a filling material into the cavity (4) for receiving a shield machine.
  2. 2. Shield reception method according to claim 1, characterized in that the filling material completely fills the cavity (4).
  3. 3. The shield receiving method according to claim 1 or 2, wherein the filling material comprises one or more of clay, gray soil, graded sand, low grade plain concrete, foam concrete, and the packing material in the cavity (4) after filling is in a medium compaction state or more.
  4. 4. The shield reception method according to claim 1, wherein the filler material comprises a controllable low-strength material such as flowcured soil, low grade plain concrete, industrial solid waste-based cured soil, biopolymer cured soil, clinker-free cement-based cured soil, red mud-based cured soil, engineering dreg-based cured soil, light foamed soil.
  5. 5. Shield reception method according to claim 1 or 2, characterized in that the material of the front blocking wall (3) is a machinable material allowing the shield machine to cut.
  6. 6. The shield receiving method according to claim 5, wherein the front blocking wall (3) comprises a wall body formed by C25 sprayed concrete and a glass fiber reinforced steel frame embedded in the wall body.
  7. 7. The shield reception method according to claim 1 or 2, characterized in that the constructing the undercut tunnel (1) comprises constructing an undercut tunnel supporting structure (8), the inside diameter of the undercut tunnel supporting structure (8) being larger than or equal to the outside diameter of the cutterhead of the shield machine.
  8. 8. The shield reception method according to claim 7, characterized in that the undercut tunnel supporting structure (8) comprises a supporting reinforcement (11) with a reduced inner diameter, the supporting reinforcement (11) being arranged adjacent to the front blocking wall (3), the inner diameter of the supporting reinforcement (11) being greater than or equal to the outer diameter of the cutterhead of the shield machine.
  9. 9. Shield reception method according to claim 1 or 2, characterized in that the rear blocking structure (5) comprises a rear blocking wall (6).
  10. 10. The shield reception method according to claim 9, characterized in that the shield reception method comprises: The rear blocking wall (6) is formed by integral pouring, a grouting pipe is embedded in the lower part of the rear blocking wall (6), an exhaust hole is formed in the upper part of the rear blocking wall (6), and a controllable low-strength material is filled from the grouting pipe from bottom to top so as to enable the cavity (4) to be filled and saturated.
  11. 11. Shield reception method according to claim 10, characterized in that the rear blocking structure (5) comprises a blocking wall support (7), which blocking wall support (7) is located on the free side of the rear blocking wall (6) for supporting the rear blocking wall (6).
  12. 12. Shield reception method according to claim 10, characterized in that the clear distance between the rear plugging structure (5) and the front plugging wall (3) is larger than the shield head length.

Description

Shield receiving method Technical Field The application relates to the field of tunnel construction, in particular to a shield receiving method in tunnel construction. Background With the development of tunnel construction technology, a shield method gradually becomes a mainstream method for constructing a tunnel. In general, the shield receiving mode is that before a shield machine approaches a receiving well, grouting reinforcement is carried out on an end stratum, a portal sealing device is arranged on the end wall of the receiving well, after a shield body enters a receiving base, a curtain cloth is pressed on the shield body through a pressing plate to form a seal, and grease or mortar is injected into a sealing cavity through a grouting hole to seal a gap. Corresponding schemes of shield receiving have been proposed in the industry, for example, a shield receiving construction method is disclosed in chinese patent publication CN111396066 a (chinese patent application No. 202010235336.1, entitled "RATB combined shield receiving construction method"), and as shown in fig. 1, the method adopts a method of arranging sleeve valve pipes along two sides of a tunnel at a surface corresponding to a dug section, grouting a surface subsidence area and a shield receiving section, grouting a horizontal advanced curtain in a hole, arranging a dewatering well, dewatering a well pipe, dug a receiving end, arranging a blocking wall, and back-pressure backfilling after the blocking wall is applied. The receiving mode is more dependent on precipitation and foundation reinforcement quality, and if the reinforcement quality is insufficient or the reinforcement range is insufficient, the water and soil pressure is unbalanced, so that the safety problems such as ground collapse and the like are easily caused. And need promptly build a wall and carry out back pressure backfill operation after the shield body gets into, if earlier stratum consolidates and exists local weak point or precipitation effect and does not cover this region completely, still there is potential safety hazards such as earth's surface subsidence that the water and soil pressure unbalance led to in this period, can't reliably realize the receipt to the shield machine steadily. Besides, the cost of precipitation and foundation reinforcement construction is high. Therefore, how to provide a solution for simply and reliably receiving the shield machine is a technical problem to be solved in the field. Disclosure of Invention In view of this, the present application proposes a shield reception method, which includes: the method comprises the steps of constructing a subsurface tunnel, constructing a front plugging wall at the front part of the subsurface tunnel, constructing a rear plugging structure at the rear part of the subsurface tunnel, forming a cavity between the front plugging wall and the rear plugging structure, and filling materials into the cavity for receiving a shield machine. Preferably, the filling material completely fills the cavity. Preferably, the filling material comprises one or more of clay, gray soil, graded sand, low-grade plain concrete and foam concrete, and the compactness of the filling material in the cavity reaches a medium compact state and above after filling is completed. Preferably, the filler material comprises a controllable low strength material such as a flow cured soil, low grade plain concrete, industrial solid waste based cured soil, biopolymer cured soil, clinker free cement based cured soil, red mud based cured soil, engineering dreg based cured soil, light foamed soil. Preferably, the material of the front plugging wall is a machinable material allowing the shield machine to cut. Preferably, the front blocking wall comprises a wall body formed by C25 sprayed concrete and a glass fiber reinforced steel frame embedded in the wall body. . Preferably, the constructing the undercut tunnel includes constructing an undercut tunnel support structure having an inner diameter greater than or equal to an outer diameter of a cutterhead of the shield machine. Preferably, the undercut tunnel supporting structure comprises a supporting reinforcing part with a reduced inner diameter, the supporting reinforcing part is arranged adjacent to the front blocking wall, and the inner diameter of the supporting reinforcing part is larger than or equal to the outer diameter of a cutterhead of the shield machine. Preferably, the rear closure structure comprises a rear closure wall. Preferably, the shield receiving method comprises the steps that the rear blocking wall is formed by integral pouring, a grouting pipe is embedded in the lower portion of the rear blocking wall, an exhaust hole is formed in the upper portion of the rear blocking wall, and controllable low-strength materials are filled from bottom to top from the grouting pipe, so that the cavity filling is saturated. Preferably, the rear plugging structure comprises a plugging w