Shield tunnel segment tensioning device and method capable of applying longitudinal tension

Abstract

The invention relates to a shield tunnel segment tensioning device and method capable of applying longitudinal tension. The shield tunnel segment tensioning device comprises a fixing bolt, a first channel steel plate, a second channel steel plate, a first jacking force plate, a second jacking force plate, a first stiffening plate, a second stiffening plate, a first end plate, a second end plate, a fastening bolt and a jack. The 1 # jacking force plate, the 1 # stiffening plate and the 1 # end plate are welded on the 1 # channel steel plate; the 2 # jacking force plate, the 2 # stiffening plate and the 2 # end plate are welded on the 2 # channel steel plate; the 1 # channel steel plate and the 2 # channel steel plate are connected through the fastening bolts, and the 1 # channel steel plate and the 2 # channel steel plate are fixed in the reserved grouting holes of the front segment and the rear segment adjacent to each other through the fixing bolts. According to the invention, the longitudinal tension can be applied between the shield segments, so that the segments can be effectively tensioned in the starting and receiving stages, the sealing effect between the segments is improved, and the occurrence of diseases such as overlarge circular seams and water leakage is effectively avoided.

Description

Technical Field

[0001] The invention relates to a shield tunnel construction device and method, in particular to a shield tunnel segment tensioning device and method capable of applying longitudinal tension. Background Art

[0002] During the starting and receiving stages of the shield machine, the thrust of the shield machine is usually small. The shield segments lack top thrust, causing the annular gaps to widen. The segments will turn inside out, leading to segment breakage. At the same time, the segments cannot fit tightly together, which will also cause annular gap leakage. All of the above defects are irreversible.

[0003] At present, the commonly used segment tensioning device is 14b channel steel as a connecting strip, which is installed and tightened at one time after 10 rings are completed. The disadvantages of this construction method are obvious. At present, the ring width of conventional shield tunnels is 1.2m, 1.8m, and 2m. If 10 rings are tightened, the weight of a single channel steel is about 145kg to 240kg, which is heavy and inconvenient to install. In addition, the tensioning device is installed after the 10 rings of segments are assembled. The shield propulsion cylinder has experienced multiple retractions, resulting in partial loss of tension between the segments, and the tightening effect between the segments is greatly reduced. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing tensioning device is inconvenient to install and the installation is not timely, and to provide a shield tunnel segment tensioning device and method which is easy to operate and install in time and can apply longitudinal tension.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a shield tunnel segment tensioning device that can apply longitudinal tension, including fixing bolts, 1# channel steel plate, 2# channel steel plate, 1# top force plate, 2# top force plate, 1# stiffening plate, 2# stiffening plate, 1# end plate, 2# end plate, fastening bolts, and jacks; the 1# top force plate, 1# stiffening plate, and 1# end plate are welded to the 1# channel steel plate, and the 2# top force plate, 2# stiffening plate, and 2# end plate are welded to the 2# channel steel plate; the fastening bolts connect the 1# channel steel plate with the 2# channel steel plate, and the fixing bolts fix the 1# channel steel plate and the 2# channel steel plate in the reserved grouting holes of the two adjacent front and rear segments.

[0006] Furthermore, the welding work is completed before the shield tunnel segment tensioning device is fixed to the segment.

[0007] Furthermore, the fastening bolts are installed before the shield tunnel segment tensioning device is fixed to the segment. The fastening bolts do not need to be tightened and can be installed. They are then tightened after the tension is applied.

[0008] Further, after the 1# channel steel plate and the 2# channel steel plate are installed, a jack is placed between the 1# top force plate and the 2# top force plate, a tensile force is applied, the fastening bolts are tightened, and then the jack is removed.

[0009] Furthermore, the 1# channel steel plate and the 2# channel steel plate are fixed in the reserved grouting holes of the two adjacent front and rear segments. At the same time, a grouting hole is spaced between every two tensioning devices of the same ring segment to reserve a position for installing the tensioning device of the next ring.

[0010] A construction method using a shield tunnel segment tensioning device capable of applying longitudinal tension, wherein the shield tunnel segment tensioning device is installed in each ring during the shield advance process, and the annular gaps between the segments are in a dense state under the thrust of the shield machine. At the same time, longitudinal tension is applied between the shield segments under the tension applied by the jack, so that the segments are effectively tightened in the starting and receiving stages, the sealing effect between the segments is improved, and the occurrence of excessive annular gaps and water leakage is effectively avoided.

[0011] The beneficial effects of the present invention are:

[0012] The shield tunnel segment tensioning device and construction method capable of applying longitudinal tension of the present invention can apply longitudinal tension between shield segments, so that the segments can be timely and effectively tightened in the starting and receiving stages, thereby improving the sealing effect between the segments and effectively avoiding the occurrence of defects such as excessive annular gaps and water leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the structure of the shield tunnel segment tensioning device capable of applying longitudinal tension according to the present invention;

[0014] Figure 2 It is a rear view of the structure of the shield tunnel segment tensioning device capable of applying longitudinal tension according to the present invention;

[0015] Figure 3 yes Figure 1 Sectional view along AA;

[0016] Figure 4 yes Figure 1 Sectional view along BB;

[0017] Figure 5 yes Figure 1 Cross-sectional view along CC;

[0018] Figure 6 yes Figure 1 Sectional view along DD;

[0019] Figure 7 yes Figure 1 Sectional view along EE;

[0020] Figure 8 This is a schematic diagram of the fixing bolts of the grouting holes of the pipe segments. DETAILED DESCRIPTION

[0021] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0022] like Figures 1 to 8 As shown, a shield tunnel segment tensioning device capable of applying longitudinal tension of the present invention comprises the following parts: fixing bolts 1, 1# channel steel plate 2, 2# channel steel plate 3, 1# top force plate 5, 2# top force plate 4, 1# stiffening plate 7, 2# stiffening plate 6, 1# end plate 9, 2# end plate 10, fastening bolts 8, and jack 11.

[0023] The present invention is mainly composed of 1# channel steel plate 2 and 2# channel steel plate 3. The 1# channel steel plate 2 and 2# channel steel plate 3 are respectively processed into concave and convex shapes so that they can move relatively under the action of the jack 11. Before installation, the 1# top plate 5, the 1# stiffening plate 7, and the 1# end plate 9 are welded to the 1# channel steel plate 2, and the 2# top plate 4, the 2# stiffening plate 6, and the 2# end plate 10 are welded to the 2# channel steel plate 3. The 1# channel steel plate 2 and the 2# channel steel plate 3 are connected by two fastening bolts 8. The fastening bolts 8 do not need to be fastened before the tensioning device is fixed to the pipe segment. It can be installed and fastened after the tension is applied.

[0024] After the tensioning device is processed, it is installed, and the 1# channel steel plate 2 and the 2# channel steel plate 3 are fixed to the reserved grouting holes of the two adjacent front and rear segments by the fixing bolts 1. After the 1# channel steel plate 2 and the 2# channel steel plate 3 are installed, the jack 11 is placed between the 1# top force plate 5 and the 2# top force plate 4, and the tension is applied to tighten the fastening bolts 8, and then the jack 11 is removed, and the installation of the tensioning device is completed.

[0025] The tensioning device of each ring should be installed during the advancement process. Under the thrust of the shield machine, the annular gaps between the segments are in a dense state. At the same time, under the tension applied by the jack 11, the tensioning effect is optimal. There should be a grouting hole between every two tensioning devices of the same ring segment to leave space for the installation of the tensioning device of the next ring.

[0026] In summary, in the embodiment of the present invention, a shield tunnel segment tensioning device and a construction method that can apply longitudinal tension are provided. A shield tunnel segment tensioning device and a construction method that can apply longitudinal tension is provided, which is easy to operate and timely to install. Through the present invention, longitudinal tension can be applied between shield segments, so that the segments can be effectively tightened during the starting and receiving stages, thereby improving the sealing effect between the segments and effectively avoiding the occurrence of defects such as excessive annular gaps and water leakage.

Claims

1. A shield tunnel segment tensioning device capable of applying longitudinal tension, characterized in that: The invention comprises fixing bolts (1), a No. 1 channel steel plate (2), a No. 2 channel steel plate (3), a No. 1 top force plate (5), a No. 2 top force plate (4), a No. 1 stiffening plate (7), a No. 2 stiffening plate (6), a No. 1 end plate (9), a No. 2 end plate (10), fastening bolts (8), and a jack (11); the No. 1 top force plate (5), the No. 1 stiffening plate (7), and the No. 1 end plate (9) are welded to the No. 1 channel steel plate (2); the No. 2 top force plate (4), the No. 2 stiffening plate (6), and the No. 2 end plate (10) are welded to the No. 2 channel steel plate (3); the fastening bolts (8) connect the No. 1 channel steel plate (2) and the No. 2 channel steel plate (3); and the fixing bolts (1) fix the No. 1 channel steel plate (2) and the No. 2 channel steel plate (3) in the reserved grouting holes of two adjacent front and rear segments.

2. The shield tunnel segment tensioning device capable of applying longitudinal tension according to claim 1, characterized in that: The welding work is completed before the shield tunnel segment tensioning device is fixed to the segment.

3. The shield tunnel segment tensioning device capable of applying longitudinal tension according to claim 1, characterized in that: The fastening bolts (8) are installed before the shield tunnel segment tensioning device is fixed to the segment. The fastening bolts (8) do not need to be tightened and can be installed. They are tightened after the tension is applied.

4. The shield tunnel segment tensioning device capable of applying longitudinal tension according to claim 1, characterized in that: After the installation of the 1# channel steel plate (2) and the 2# channel steel plate (3) is completed, a jack (11) is placed between the 1# jacking plate (5) and the 2# jacking plate (4), a tensile force is applied, the fastening bolts (8) are tightened, and then the jack (11) is removed.

5. The shield tunnel segment tensioning device capable of applying longitudinal tension according to claim 1, characterized in that: The 1# channel steel plate (2) and the 2# channel steel plate (3) are fixed in the reserved grouting holes of the two adjacent segments in front and behind. At the same time, a grouting hole is spaced between every two tensioning devices of the same ring segment to reserve a position for installing the tensioning device of the next ring.

6. A construction method using the shield tunnel segment tensioning device capable of applying longitudinal tension as claimed in any one of claims 1 to 5, characterized in that: This method installs a tensioning device for each ring of shield tunnel segments during the shield tunneling process. Under the thrust of the shield machine, the annular gaps between the segments are in a dense state. At the same time, under the action of the pulling force applied by the jack, a longitudinal pulling force is applied between the shield segments, so that the segments are effectively tightened during the starting and receiving stages, thereby improving the sealing effect between the segments and effectively avoiding the occurrence of excessive annular gaps and water leakage.

Images