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CN-116066147-B - Intelligent automatic grouting method suitable for weak broken roof of deep-buried highway tunnel

CN116066147BCN 116066147 BCN116066147 BCN 116066147BCN-116066147-B

Abstract

The invention discloses an intelligent automatic grouting method suitable for a weak broken roof of a deeply buried highway tunnel, which comprises the following steps of (1) arranging a grouting main pipe system on the whole line of the upper part of the highway tunnel when the highway tunnel is driven, (2) repairing a hollow grouting anchor rope on the weak broken roof in the highway tunnel 10-20m away from the tunnel face in the process of driving the tunnel face, connecting the hollow grouting anchor rope with the grouting main pipe for grouting, (3) rapidly arranging a monitoring and early warning instrument in the tunnel weak broken roof lagging the tunnel face in the process of driving the tunnel face, and (4) automatically grouting the weak broken roof of the highway tunnel after the grouting main pipe system receives an early warning signal. The invention can timely monitor the real-time separation layer quantity of the weak broken top plate, can accurately grasp the grouting time, ensures the grouting effect, obviously reduces the complicated and repeated working links of manual grouting, can avoid the wrong judgment of the grouting time, and improves the grouting efficiency of the weak broken top plate of the highway tunnel.

Inventors

  • Wu jingke
  • ZHANG LONGSHENG
  • CHEN CHENG
  • TAO JIAN
  • CHEN YANHUA
  • TANG WEI

Assignees

  • 江苏宝利国际投资股份有限公司
  • 江苏宝利路面材料技术有限公司

Dates

Publication Date
20260505
Application Date
20230210

Claims (9)

  1. 1. The intelligent automatic grouting method suitable for the weak broken roof of the deeply buried highway tunnel is characterized by comprising the following steps of: Step one, along with forward pushing of a tunnel face (4) of a highway tunnel (2), arranging a grouting main pipe system on the whole line of a side part (8), wherein the grouting main pipe system comprises a grouting main pipe and a grouting pump connected with the grouting main pipe, and a plurality of grouting main pipe joints with intelligent control valves for branch grouting are further arranged on the grouting main pipe; Secondly, in the pushing process of the tunnel face (4) of the highway tunnel, repairing and beating a plurality of hollow grouting anchor cables (12) as branch grouting pipes in a position 10-20m away from the weak broken top plate (11) of the tunnel face (4), wherein the hollow grouting anchor cables are connected with a grouting main pipe for grouting; Step three, rapidly arranging a roof monitoring and early warning instrument (13) in a tunnel weak broken roof (11) of a lagged tunnel face along with forward advancement of a tunnel face (4) of the highway tunnel so as to measure the delamination subsidence amount of the deep and shallow parts in the weak broken roof (11) and determine grouting time; When an intelligent control valve on a grouting main pipe receives an early warning signal of a roof monitoring early warning instrument (13), the intelligent control valve is automatically started immediately to automatically grouting a soft broken roof (11) of the highway tunnel; when the separation layer quantity and separation layer speed early warning threshold value of the weak broken roof of the highway tunnel reach the early warning threshold value, the early warning instrument automatically early warns, and the early warning signal sent by each roof monitoring early warning instrument can be received by 3-6 pairs of intelligent control valves nearby.
  2. 2. The intelligent automatic grouting method for the weak broken roof of the deeply buried highway tunnel according to claim 1, wherein the step of arranging the grouting main pipe system in the highway tunnel is characterized in that firstly, a grouting pump station is arranged close to the upper part of the highway tunnel for placing a grouting pump and grouting materials, then, the grouting main pipe is fixed at the middle upper part of the upper part along the axis direction of the tunnel, and the whole length in the tunnel is arranged, and one end of the grouting main pipe is connected with the grouting pump.
  3. 3. The intelligent automatic grouting method suitable for the weak broken roof of the deep-buried highway tunnel is characterized in that the grouting main pipe is a steel circular pipe or a plastic circular pipe, an interlayer is arranged in the circular pipe, two grouting channels, namely a grouting A channel and a grouting B channel, are formed in the circular pipe, 1 pair of grouting main pipe joints with intelligent control valves are respectively arranged on the grouting main pipe every 2-3 m, branch grouting pipes are respectively used for connecting the weak broken roof, one of the branch grouting pipes is connected with the grouting A channel, the other branch grouting pipe is connected with the grouting B channel, and the intelligent control valves are in a closed state when the intelligent control valves are not used for grouting.
  4. 4. The intelligent automatic grouting method suitable for the weak broken roof of the deep-buried highway tunnel, which is characterized in that the hollow grouting anchor cable (12) is arranged on the weak broken roof through drilling holes, the drilling holes are positioned in the middle of the weak broken roof, at least one drilling hole is arranged in each row, the diameter of each drilling hole is 32-48 mm, the distance between the drilling holes is 2-3 m, and the drilling hole depth L is determined according to 1.2 times of the thickness of the weak broken roof.
  5. 5. The intelligent automatic grouting method suitable for the weak broken roof of the deep-buried highway tunnel is characterized in that a hollow grouting anchor rope (12) is connected with a grouting main pipe through a Y-shaped rubber grouting pipe to realize grouting, a bifurcation hose at one end of the Y-shaped rubber grouting pipe is respectively connected with an intelligent control valve of a grouting main pipe joint on a grouting A channel and an intelligent control valve of a grouting main pipe joint on a grouting B channel, the other end of the Y-shaped rubber grouting pipe is connected with a grouting pipe joint at the tail part of the hollow grouting anchor rope (12), and the Y-shaped rubber grouting pipe is tightly fixed on surrounding rock.
  6. 6. The intelligent automatic grouting method for the weak broken roof of the deeply buried highway tunnel according to claim 1, wherein the roof monitoring and early warning instrument is rapidly arranged in the highway tunnel every 5-15m along with the advance of the tunnel face, and the measuring station distance of the roof monitoring and early warning instrument is 2m from the concrete wall body and the measuring station distance is 10m so as to measure the separation layer sinking amount of the deep and shallow parts in the weak broken roof, thereby determining grouting time.
  7. 7. The intelligent automatic grouting method suitable for the weak broken roof of the deep-buried highway tunnel is characterized in that the early warning threshold values of the roof monitoring early warning instrument are set to be 150-200 mm in total number of roof separation layers of ①, less than 2mm/d in separation layer speed value, warning is carried out, and ② is greater than 200mm in total number of roof separation layers, and warning is carried out.
  8. 8. The intelligent automatic grouting method suitable for the weak broken roof of the deep-buried highway tunnel, which is disclosed in claim 1, is characterized in that an intelligent control valve on a grouting main pipe is automatically opened immediately after receiving an early warning signal, grouting slurry sequentially enters a weak broken roof fracture rock mass through a grouting pump, the grouting main pipe, a Y-shaped rubber grouting pipe and a grouting pipe of a hollow grouting anchor cable, and after grouting time or grouting amount reaches a set value, the intelligent control valve is closed, grouting is stopped, and grouting of the weak broken roof of the highway tunnel of one section is completed.
  9. 9. The intelligent automatic grouting method suitable for the weak broken roof of the deeply buried highway tunnel according to claim 1 is characterized in that after grouting of the weak broken roof of the highway tunnel in one section is completed, after grouting liquid is solidified, a disposable Y-shaped rubber grouting pipe and a reusable digital display early warning instrument are removed, and after construction of the highway tunnel is completed, a grouting main pipe is flushed, and all grouting pipelines are removed for reuse.

Description

Intelligent automatic grouting method suitable for weak broken roof of deep-buried highway tunnel Technical Field The invention belongs to the field of tunnel engineering, and particularly relates to an intelligent automatic grouting method suitable for a weak broken roof of a deeply buried highway tunnel. Background In the field engineering practice of the deep-buried highway tunnel, the phenomena of loose failure damage, roof falling and the like of the supporting structure occur in the process that after the weak broken top plate adopting the high-strength supporting is subjected to strong tunneling disturbance, the internal crack of the weak broken top plate is developed and broken. The construction site tries to reinforce and strengthen disturbance cracks of the weak broken roof of the deep-buried highway tunnel by adopting a grouting mode, but because the cracks of the weak broken roof are in different deformation, cracking and development stages in different time periods and different areas, the optimal grouting time is difficult to determine. If grouting is too early, the opening of a roof crack is smaller, grouting liquid is difficult to inject, the grouting effect is poor, and the grouting reinforcement rock mass is damaged again due to strong disturbance, so that grouting reinforcement failure is caused. If grouting is too late, the deformation and damage of the top plate are serious, the bearing capacity is lost, the opening of the top plate crack is large, the grouting is easy to inject, but the top plate and the primary supporting structure are instable and damaged, and at the moment, the grouting is meaningless, namely the optimal grouting time is lost. The top plate grouting timing is too early or too late, which may result in poor grouting effect of the weak broken top plate and difficulty in forming a complete bearing structure. The intelligent automatic grouting method is suitable for the weak broken roof of the deep-buried highway tunnel, not only can determine the correct grouting time, but also can realize automatic grouting, and aims to improve the grouting effect of mining cracks of the weak broken roof, ensure that the weak broken roof forms a complete bearing structure and ensure the integrity, stability and safety of surrounding rocks of the deep-buried highway tunnel. Disclosure of Invention The invention aims to solve the problems, and provides an intelligent automatic grouting method suitable for a weak broken roof of a deeply buried highway tunnel, which is used for intelligent automatic grouting of the weak broken roof when a highway tunnel is excavated, or intelligent automatic grouting of the weak broken roof of a No. 2 highway tunnel when another highway tunnel is excavated beside a No. 1 highway tunnel of a built highway tunnel (a wall body between two tunnels is a concrete wall body), and aims to improve the grouting effect of the weak broken roof of the deeply buried highway tunnel, ensure that the roof forms a complete bearing structure and ensure the integrity, stability and safety of surrounding rocks of the highway tunnel. The invention is realized by the following technical scheme: The intelligent automatic grouting method suitable for the soft broken roof of the deeply buried highway tunnel starts to perform preparation work for grouting the soft broken roof of the highway tunnel during tunneling and supporting of the highway tunnel, and comprises the following steps: Along with the forward propulsion of the tunnel face of the highway tunnel, a grouting main pipe system is arranged on the whole line of the upper part, the grouting main pipe system comprises a grouting main pipe and a grouting pump connected with the grouting main pipe, and a plurality of grouting main pipe joints with intelligent control valves for branch grouting are further arranged on the grouting main pipe. Firstly, arranging a grouting pump station on the upper part of a highway tunnel for placing a multifunctional grouting pump and grouting materials, and then fixing a grouting main pipe on the upper middle part and the upper part of the upper part along the axial direction of the tunnel, arranging the whole length of the grouting main pipe and connecting one end of the grouting main pipe with the multifunctional grouting pump. The grouting main pipe is made of steel round pipes or plastic round pipes, an interlayer is arranged in each round pipe, two grouting channels, namely a grouting A channel and a grouting B channel, are formed in each round pipe, 1 pair of grouting main pipe joints with intelligent control valves are respectively arranged on each grouting main pipe every 2-3 m, the grouting main pipe joints are all branch grouting pipes used for connecting a weak broken top plate, one branch grouting pipe is connected with the grouting A channel, the other branch grouting pipe is connected with the grouting B channel, and the intelligent control valves are all in a closed state when n