Control apparatus and method for buoyancy adjustment of shield tunnel segments

Patent metadata

Field	Value
Publication number	US-2025067177-A1
Application number	US-202418929709-A
Country	US
Kind code	A1
Filing date	Oct 29, 2024
Priority date	May 17, 2023
Publication date	Feb 27, 2025
Grant date	—

Abstract

The present invention discloses a control apparatus and method for buoyancy adjustment of shield tunnel segments, wherein the inner end wall of anchor rod accommodating cavity is provided with a first slurry channel extending forward to the outer peripheral wall of anchor rod, the countersunk bolt is provided with a second slurry channel passing through the front and rear end faces of the countersunk bolt, and a locking structure is disposed in the accommodating cavity to lock the countersunk bolt in the accommodating cavity and connect the first slurry channel and second slurry channel. The entire construction process which can be carried out during the construction or operation period greatly reduces construction costs and space.

First claim

What is claimed is:

1 . A control apparatus for buoyancy adjustment of shield tunnel segments, comprising:
an anchor rod in which an axial accommodating cavity with a rear end opening is provided, a first slurry channel extending forward to the outer peripheral wall of anchor rod is provided at the inner end wall of accommodating cavity, and the anchor rod is squeezed into the formation as a whole through the tunnel segment; a countersunk bolt that is inserted into the accommodating cavity, and the front end of countersunk bolt is provided with a second slurry channel extending to the rear end, and the second slurry channel is used to communicate with the first slurry channel; a locking mechanism that is located in the accommodating cavity to lock countersunk bolt in the accommodating cavity; and a threaded connection structure that is screwed onto countersunk bolts and, directly or through intermediate components, pushes against tunnel segments.

2 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 1 , further comprising a plugging structure that is disposed at the through hole of segments for anchor rod to pass through and, directly or in conjunction with waterproof filler, seals the gap at the through hole.

3 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 1 , wherein the locking mechanism comprises an expansion sleeve that is expanded through inner compression and an annular cone sleeve that drives expansion sleeve to expand, the expansion sleeve and annular cone sleeve are distributed in front and behind and fitted on the position of countersunk bolt near the head, the rear end of expansion sleeve is provided with an outward protruding block, a recessed platform that fits the block is provided at a position on peripheral wall of accommodating cavity corresponding to the block, the inner side of expansion sleeve is also provided with an inward recessed positioning platform, and one end of the annular cone sleeve facing expansion sleeve is provided with a positioning portion that is clipped into the positioning platform.

4 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 3 , wherein the inner wall of accommodating cavity is provided with a guide groove that limit and guide the clamping blocks, and a plurality of guide grooves are disposed around the circumferential wall of accommodating cavity, and the clamping platform is disposed at the guide grooves.

5 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 3 , wherein the countersunk bolt has a radially extending limit block, and the rear end of expansion sleeve is provided with an axially extending limit groove, and the limit block fits and moves axially along the limit groove.

6 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 3 , wherein the anchor rod comprises a front section and a rear section, and the locking device is disposed inside the front section, the rear end of front section is provided with internal threads, and the front end of rear section is provided with external threads, the front end of rear section is connected to the rear end of front section through thread fit, and the annular cone sleeve is pushed forward inside the expansion sleeve to radially expand the expansion sleeve.

7 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 4 , wherein the anchor rod comprises a front section and a rear section, and the locking device is disposed inside the front section, the rear end of front section is provided with internal threads, and the front end of rear section is provided with external threads, the front end of rear section is connected to the rear end of front section through thread fit, and the annular cone sleeve is pushed forward inside the expansion sleeve to radially expand the expansion sleeve.

8 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 5 , wherein the anchor rod comprises a front section and a rear section, and the locking device is disposed inside the front section, the rear end of front section is provided with internal threads, and the front end of rear section is provided with external threads, the front end of rear section is connected to the rear end of front section through thread fit, and the annular cone sleeve is pushed forward inside the expansion sleeve to radially expand the expansion sleeve.

9 . The control apparatus for buoyancy adjustment of shield tunnel segments according to claim 1 , comprising the following steps:
S 1 : lock countersunk bolt in the accommodating cavity through the locking mechanism, and squeeze anchor rod into the formation through the segments from inside the tunnel at the area subjected to buoyancy control; S 2 : drive anchor rod to rotate and allow the slurry to flow into the formation through the second and first slurry channels until the grouting is completed; S 3 : solidified slurry combines anchor rod with the formation in the area as a whole, and the threaded connection structure advances along countersunk bolt within the tunnel for a predetermined distance and, directly or through intermediate components, pushes against the segments.

10 . The buoyancy control method according to claim 9 , in step S 1 , the process of locking countersunk bolt in the accommodating cavity by the locking mechanism comprises:
S 11 : insert expansion sleeve and annular cone sleeve onto countersunk bolt in sequence; S 12 : insert the countersunk bolt, and the expansion sleeve and annular cone sleeve fitted hereon into the front section of anchor rod together; S 13 : insert the rear section of anchor rod from the rear end of countersunk bolt and screw into the front section of anchor rod and, during the process, the rear section pushes annular cone sleeve forward to insert inside the expansion sleeve to radially expand the expansion sleeve, so that the clamping block of expansion sleeve is clipped into the clamping platform on the peripheral wall of accommodating cavity, and the anchor rod, expansion sleeve, annular cone sleeve, and countersunk bolt are fixed relative to each other.

11 . The buoyancy control method according to claim 9 , step S 1 , before or during the process of squeezing anchor rod into the formation, further comprises installing a plugging structure at the through hole of segments for anchor rod to pass through and, directly or in conjunction with waterproof filler, sealing the gap at the through hole.

12 . The buoyancy control method according to claim 9 , further comprising assembling an extension section at the rear end of anchor rod before squeezing anchor rod into the formation through the segments, and removing the extension section from anchor rod after slurry solidification.

Assignees

• Shenzhen Campus Of Sun Yat Sen Univ
• Univ Sun Yat Sen
• Southern Marine Science And Eng Guangdong Laboratory Zhu Hai

Inventors

• Huang Linchong
• Huang Xumin
• Liang Yu
• Zhao Chenyang
• Lin Cungang

Classifications

• E21D11/083 Primary

  Methods or devices for joining adjacent concrete segments · CPC title

• E21D20/02 Primary

  with provisions for grouting · CPC title

• Y02E10/20

  Hydro energy · CPC title

• E21D21/008

  Anchoring or tensioning means · CPC title

• E21D21/0026

  characterised by constructional features of the bolts · CPC title