Sliding supporting type tunnel inner tensioning steel ring fixing structure and mounting method

Abstract

The sliding supporting type tunnel inner tensioning steel ring fixing structure comprises standard steel rings, brackets and chemical anchor bolts, and the multiple standard steel rings are connected end to end to be arranged around the inner ring of a pipe piece and fixed to the pipe piece through the chemical anchor bolts; the bracket comprises a first cattle leg part, a second cattle leg part and a sliding supporting part, and the sliding supporting part is located between the first cattle leg part and the second cattle leg part, so that the first cattle leg part and the second cattle leg part can move up and down; the first cattle leg part is connected with the standard steel ring and the duct piece, the second cattle leg part is fixed to the spring floating slab ballast bed, compared with the prior art, due to the arrangement of the sliding supporting piece, the second cattle leg part can move up and down with the first cattle leg part as the reference, transverse stress transmission is effectively conducted between the bracket and the internally-tensioned steel ring, and the transverse stress transmission is effectively conducted; and meanwhile, the vertical damping function of the floating track bed is also reserved.

Description

Technical Field

[0001] The invention relates to the technical field of shield tunnel reinforcement, in particular to a sliding support type tunnel inner tension steel ring fixing structure and an installation method. Background Art

[0002] A shield tunnel is a tunnel structure excavated underground or underwater by a shield machine, and is widely used in urban subways, railways, highways, hydraulic tunnels and other projects. Under the influence of factors such as long-term settlement and surface overload, shield tunnels are prone to excessive lateral deformation.

[0003] In view of the above situation, the following measures are adopted to improve it. First, grouting on both sides of the tunnel can effectively reduce the convergence deformation of the tunnel. However, the effect of grouting to resist the lateral deformation of the shield tunnel is limited; second, adding inner tension steel rings inside the tunnel to increase the circumferential stiffness of the tunnel and realize joint force. When the inner tension steel ring is applied to the conventional roadbed, it is only necessary to cut the drainage ditches on both sides of the roadbed and connect the end of the inner tension steel ring to the top of the roadbed; however, when the end of the inner tension steel ring is connected to the top of the floating roadbed, the track in the floating roadbed cannot float up and down, and the floating roadbed can reduce the vibration to the surrounding environment through its own floating, thereby making the floating roadbed lose its shock absorption effect.

[0004] Furthermore, the structure and connection method of the inner tension steel ring itself also determine whether it can play a role in lateral resistance.

[0005] Therefore, in order to enable the floating roadbed to float and at the same time enable the inner steel ring to play a lateral resistance role, a sliding support type tunnel inner steel ring fixing structure and installation method are designed. Summary of the invention

[0006] The present invention aims to overcome the defects in the above-mentioned prior art and provides a sliding support type tunnel inner tension steel ring fixing structure and installation method, which can realize the floating of the floating roadbed and play a role in lateral resistance.

[0007] In order to achieve the above purpose, the technical solution adopted by the present invention is: a sliding support type tunnel tension steel ring fixing structure, including a standard steel ring, a corbel and a chemical anchor, a plurality of the standard steel rings are connected end to end and arranged in the inner ring of the segment, and are fixed to the segment by chemical anchors; the corbel includes a first corbel part, a second corbel part and a sliding support, the sliding support is located between the first corbel part and the second corbel part, so that the first corbel part and the second corbel part can move up and down; the first corbel part is connected to the standard steel ring and the segment, and the second corbel part is fixed on the floating roadbed.

[0008] As a preferred solution of the present invention, it includes a saddle steel ring, which is located between laterally adjacent standard steel rings.

[0009] As a preferred solution of the present invention, the saddle steel ring and the standard steel ring are welded together, and adjacent standard steel rings are welded together.

[0010] As a preferred solution of the present invention, the second corbel portion and the floating ballast bed are connected by chemical anchor bolts.

[0011] As a preferred solution of the present invention, the chemical anchor bolts located between the standard steel ring and the segment are anchored into the segment to a depth greater than or equal to 150 mm, and the spacing between the circumferentially arranged chemical anchor bolts is between 400-500 mm.

[0012] As a preferred solution of the present invention, the first corbel portion includes a connecting portion and a rib plate, the connecting portion is vertically arranged and connected to the sliding support, and the rib plate connects the standard steel ring and the connecting portion.

[0013] As a preferred solution of the present invention, the second corbel portion includes a fixed portion, a vertical portion, an intermediate rib plate and an annular rib plate, the fixed portion is installed on the floating ballast, the vertical portion is vertically arranged and connected to the sliding support, the annular rib plate connects the fixed portion and the vertical portion, and the intermediate rib plate connects adjacent annular rib plates.

[0014] As a preferred solution of the present invention, the sliding support member includes a slider, a slide rail and a limiting portion. The slider is slidably disposed on the slide rail. The limiting portion is located on both sides of the slide rail and is used to limit the movement of the slider.

[0015] A method for installing a sliding support type tunnel inner steel ring fixing structure, comprising: Step 1: Clean the pipe segments; Step 2: Assemble the corbels; Step 3: Weld the first corbel part of the corbel to the standard steel ring near one side thereof; the first corbel part of the corbel is fixedly connected to the pipe segment through a chemical anchor bolt; the second corbel part of the corbel is fixedly connected to the floating ballast bed through a chemical anchor bolt; Step 4: Fix the remaining standard steel rings to the segments through chemical anchors; Step 5: Install the saddle steel ring between the laterally adjacent standard steel rings; Step 6: Connect the circumferentially adjacent standard steel rings by welding, and connect the standard steel rings and the saddle steel rings by welding.

[0016] As a preferred embodiment of the present invention, step 1 also includes repairing the pipe segment, wherein the area of ​​the damaged portion of the pipe segment is greater than 0.2 m 2 , need to be repaired by grouting.

[0017] Beneficial effects: 1. Compared with the prior art, the present invention, due to the setting of the sliding support, enables the second corbel part to move up and down based on the first corbel part, thereby realizing the lateral force transmission between the corbel and the inner tension steel ring, while also retaining the vertical shock absorption function of the floating ballast.

[0018] 2. Due to the setting of the sliding support member, the second corbel part of the present invention can move up and down based on the first corbel part, and the second corbel part is fixed on the floating ballast, thereby ensuring that the track in the floating ballast can also float up and down, realizing the shock absorption effect of the floating ballast.

[0019] 3. The standard steel ring and the saddle steel ring of the present invention are connected to the pipe segment through chemical anchor bolts, and the standard steel rings and the standard steel rings, and the standard steel rings and the saddle steel rings are welded to form a complete stress-bearing internal tension steel ring, which can play a role in lateral resistance.

[0020] 4. The standard steel ring of the present invention is a standard part, which improves the processing and construction efficiency, and the saddle steel ring between the standard steel rings makes up for the problem of adjusting the length of the steel ring due to inconsistent segment sizes.

[0021] 5. One side of the corbel of the present invention is connected to the inner tension steel ring, and the other side of the corbel is connected to the floating ballast bed, which plays a role in lateral resistance.

[0022] 6. Compared with the prior art, the present invention clarifies that the depths of chemical anchor bolts anchored into the floating ballast and the pipe segment are different, and also determines the depth of chemical anchor bolts anchored into the pipe segment, thereby ensuring the stability of the connection between the inner tension steel ring and the pipe segment.

[0023] 7. The present invention provides a group of two corbels, which are respectively arranged on both sides of the shield tunnel. The corbels are installed in advance with the nearest standard steel rings, which improves the installation accuracy and efficiency between the corbels and the standard steel rings. At the same time, the position between the corbels and the pipe segments is determined in advance, which facilitates on-site installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the corbel of the present invention; Figure 3 It is a top view of the corbel of the present invention; Figure 4 It is a schematic diagram of the transverse connection of the steel ring of the present invention; Figure 5 It is a structural schematic diagram of the sliding support member of the present invention; The reference numerals in the figure are: 1. standard steel ring, 2. corbel, 3. chemical anchor, 4. saddle steel ring, 5. floating ballast bed, 6. segment, 21. first corbel portion, 22. second corbel portion, 23. sliding support, 211. rib plate, 212. connecting portion, 221. fixing portion, 222. vertical portion, 223. middle rib plate, 224. ring rib plate, 231. slider, 232. slide rail, 233. limiting portion. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-Figure 5 As shown, a sliding support type tunnel tension steel ring fixing structure includes a standard steel ring 1, a corbel 2 and a chemical anchor 3. Several standard steel rings 1 are connected end to end and arranged in the inner ring of a segment 6, and are fixed to the segment 6 by chemical anchors 3; the corbel 2 includes a first corbel portion 21, a second corbel portion 22 and a sliding support 23, and the sliding support 23 is located between the first corbel portion 21 and the second corbel portion 22, so that the first corbel portion 21 and the second corbel portion 22 can move up and down; the first corbel portion 21 is connected to the standard steel ring 1 and the segment 6, and the second corbel portion 22 is fixed on the floating ballast 5.

[0027] Among them, the segment 6 is an internal component of the shield tunnel.

[0028] Specifically, the size of the standard steel ring 1 is determined by measuring the pipe segment 6 , and the size of each component of the corbel 2 is determined by measuring the standard steel ring 1 and the floating ballast 5 .

[0029] The first corbel part 21 , the second corbel part 22 and the sliding support member 23 are connected to form the corbel 2 . Due to the existence of the sliding support member 23 , the first corbel part 21 and the second corbel part 22 can move up and down relative to each other.

[0030] Further, the standard steel ring 1 close to the first corbel part 21 needs to be welded with the first corbel part 21, and the first corbel part 21 and the standard steel ring 1 integral structure are fixed to the pipe segment 6 by chemical anchor bolts 3. The first corbel part 21 and the standard steel ring 1 integral structure avoids the on-site installation of the first corbel part 21 and the standard steel ring 1, improves the installation accuracy of the first corbel part 21 and the standard steel ring 1, and also improves the installation efficiency of the first corbel part 21 and the standard steel ring 1. Furthermore, the connection between the corbel 2 and the pipe segment 6 is facilitated; The second corbel portion 22 of the corbel 2 is fixed on the floating ballast 5 by means of chemical anchor bolts 3 .

[0031] Due to the setting of the sliding support 23, the second corbel part 22 can move up and down based on the first corbel part 21, and the corbel 2 and the standard steel ring can effectively transmit the lateral force, while also retaining the vertical shock absorption function of the floating ballast.

[0032] Other standard steel rings 1 away from the first corbel portion 21 are also fixed to the segment 6 by chemical anchors 3. All standard steel rings 1 are fixed to the segment 6 to form an arc-shaped steel ring. The standard steel rings 1 forming the arc-shaped steel ring are connected end to end and welded, which further ensures the strength of the arc-shaped steel ring and forms a complete stressed internal tension steel ring that can play a role in lateral resistance.

[0033] Due to the arrangement of the sliding support member 23, the second corbel portion 22 can move up and down based on the first corbel portion 21, and the second corbel portion 22 is fixed on the floating ballast 5, thereby ensuring that the track in the floating ballast 5 can also float up and down, thereby achieving the shock-absorbing effect of the floating ballast 5.

[0034] In the present invention, two corbels 2 are arranged in a group and are respectively arranged on both sides of the shield tunnel. The corbels 2 and the nearest standard steel rings 1 are installed in advance, which improves the installation accuracy and efficiency between the corbels 2 and the standard steel rings 1. At the same time, the position between the corbels 2 and the pipe segments 6 is determined in advance, which facilitates on-site installation.

[0035] A saddle steel ring 4 is also provided between the laterally adjacent standard steel rings 1 , and the saddle steel ring 4 is also fixed to the pipe segment 6 through the chemical anchor bolt 3 , and the connection between the saddle steel ring 4 and the standard steel ring 1 is welding.

[0036] Specifically, the standard steel ring 1 is a prefabricated standard part, and the saddle steel ring 4 between adjacent standard steel rings 1 makes up for the problem of adjusting the length of the steel ring due to inconsistent sizes of the pipe segments 6. Secondly, the saddle steel ring 4 can also connect adjacent standard steel rings 1, thereby improving the strength of the inner tension steel ring. Furthermore, the saddle steel ring 4 can cover the gap between the pipe segments 6 and the pipe segments 6, thereby supporting the connection between the pipe segments 6 and the pipe segments 6.

[0037] The inner tension steel ring of the present invention first fixes the standard steel ring 1 and the saddle steel ring 4 on the pipe segment 6 by chemical anchor bolts 3, and then connects the standard steel ring 1 and the saddle steel ring 4 by welding, so that the inner tension steel ring can be attached to and support the pipe segment 6 while ensuring the strength and stability of the inner tension steel ring; Secondly, the standard steel ring 1 is a standard part, which improves the processing and construction efficiency, and the saddle steel ring 4 between the standard steel ring 1 makes up for the problem of adjusting the length of the steel ring due to inconsistent sizes of the pipe segments 6.

[0038] The second corbel part 22 and the floating ballast bed 5 are connected via chemical anchor bolts 3 .

[0039] In order to ensure the stability and strength of the connection between the standard steel ring 1 and the segment 6, the chemical anchor 3 located between the standard steel ring 1 and the segment 6 is anchored into the segment 6 to a depth greater than or equal to 150 mm, and the spacing between the circumferentially arranged chemical anchors 3 is between 400-500 mm.

[0040] The chemical anchor bolts 3 located on the floating ballast 5 are limited by the size of the floating ballast 5. Therefore, the depth of the chemical anchor bolts 3 anchored in the floating ballast 5 needs to be changed according to the change of the size of the floating ballast 5. In this embodiment, the depth of the chemical anchor bolts 3 anchored in the concrete close to the pipe segment 6 is 90 mm, and the depth of the chemical anchor bolts 3 anchored in the concrete far from the pipe segment 6 is 130 mm. In practice, the depth of the chemical anchor bolts 3 anchored in can be changed according to the floating ballast 5 with different structures.

[0041] Compared with the prior art, the present invention clarifies that the depths at which the chemical anchor bolts 3 are anchored into the floating ballast 5 and the pipe segment 6 are different, and also determines the depth at which the chemical anchor bolts 3 are anchored into the pipe segment 6, thereby ensuring the stability of the connection between the inner tension steel ring and the pipe segment 6.

[0042] The first corbel part 21 includes a connecting part 212 and a rib plate 211. The connecting part 212 is vertically arranged and connected to the sliding support 23. The vertically arranged connecting part 212 guides the up and down movement of the second corbel part 22. The rib plate 211 connects the standard steel ring 1 and the connecting part 212, thereby realizing reinforcement between the standard steel ring 1 and the connecting part 212 and improving the strength of the first corbel part 21.

[0043] The second corbel portion 22 includes a fixed portion 221, a vertical portion 222, an intermediate rib 223 and an annular rib 224. The fixed portion 221 is installed on the floating ballast bed 5. One side of the vertical portion 222 abuts against the floating ballast bed 5 to realize the positioning of the second corbel portion 22 on the floating ballast bed 5. The other side of the vertical portion 222 is connected to the sliding support 23, and the vertical portion 222 is vertically arranged. The annular rib 224 connects the fixed portion 221 and the vertical portion 222 to realize the reinforcement of the fixed portion 221 and the vertical portion 222. The intermediate rib 223 connects the adjacent annular ribs 224 to realize the reinforcement of the intermediate rib 223, thereby improving the strength of the second corbel portion 22.

[0044] The sliding support member 23 includes a slider 231 , a slide rail 232 and a limiting portion 233 . The slider 231 is slidably disposed on the slide rail 232 . The limiting portion 233 is located at both sides of the slide rail 232 and is used to limit the movement of the slider 231 .

[0045] Specifically, the first corbel portion 21 is fixed to the pipe segment 6 by means of the chemical anchor bolt 3, and the second corbel portion 22 can move up and down along the first corbel portion 21, which is a fixing member, through the sliding support member 23. The upper and lower limit blocks 33 of the sliding support member 23 are provided, so that the distance of the up and down movement of the second corbel portion 22 along the first corbel portion 21 is limited, thereby controlling the up and down floating range of the track and realizing the shock-absorbing effect of the floating ballast bed 5.

[0046] A method for installing a sliding support type tunnel inner steel ring fixing structure, comprising: Step 1: Repair the pipe segment 6. For the defective, loose, or peeling parts of the pipe segment 6, first remove the loose and peeling concrete on the surface of these parts, clean the base surface of the pipe segment 6, apply an interface treatment agent on the base surface, and use quick repair mortar to repair. When the damaged part of the pipe segment 6 is larger than 0.2m 2 When repairing, it is necessary to pre-bury a grouting pipe around the repaired part, and fill it with quick repair mortar cement, and then pour epoxy resin into the joint through the grouting pipe; clean the pipe segment 6 and remove the calcification on the surface of the pipe segment 6; After step 1, the curvature of the pipe segment is smooth and there is no water leakage, which is convenient for the installation of the inner steel ring; Step 2: Assemble the corbel 2; determine the sizes of the first corbel part 21, the second corbel part 22, and the sliding support member 23 after on-site lofting according to the cutting size of the floating ballast bed, and assemble the first corbel part 21, the second corbel part 22, and the sliding support member 23; Step 3: Weld the first corbel part 21 to the standard steel ring 1 near one side thereof; the first corbel part 21 of the corbel 2 is fixedly connected to the pipe segment 6 through the chemical anchor bolt 3; the second corbel part 22 of the corbel 2 is fixedly connected to the floating ballast bed 5 through the chemical anchor bolt 3, In this embodiment, 4 rows of 3 M16 chemical anchors are arranged on the second corbel part 22, and the spacing between adjacent M16 chemical anchors in each row is 130 mm. The second corbel part 22 is fixed to the floating ballast bed by 12 M16 chemical anchors, wherein the anchoring depth of 4 M16 chemical anchors close to the segment 6 is 90 mm, and the anchoring depth of 8 M16 chemical anchors far from the segment 6 is 130 mm; 4 rows of 4 M16 chemical anchors, 1 in each row, are arranged on the first corbel part 21 to connect the standard steel ring 1 and the segment 6, and the anchoring depth of the M16 chemical anchors is 150 mm, wherein the M16 chemical anchors avoid the hand holes and longitudinal seams in the segment 6 by 100 mm; epoxy resin is filled in the connection gap between the segment 6, the corbel 2, and the floating ballast bed to ensure stable connection; Step 4: Fix the remaining standard steel rings 1 to the pipe segment 6 through chemical anchor bolts 3. Install the adjacent standard steel rings 1 first and then lay out and install the top standard steel ring 1. The installation of the standard steel ring 1 needs to avoid the main reinforcement of the pipe segment 6, the joint of the pipe segment 6, and the pipeline; Step 5: installing a saddle steel ring 4 between laterally adjacent standard steel rings 1, wherein the saddle steel ring 4 is fixed to the pipe segment 6 by a chemical anchor bolt 3; Step 6: Connect the circumferentially adjacent standard steel rings 1 by welding, and connect the saddle steel ring 4 and the standard steel ring 1 by welding.

[0047] All welds are welded using groove welding and gas shielded welding, and the weld grade is level two.

[0048] After the corbels and the steel rings are all installed and welded, a good force-bearing whole is formed to play a role in reinforcing and supporting the tunnel.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0050] Although this article uses the following terms more frequently: 1. standard steel ring, 2. corbel, 3. chemical anchor, 4. saddle steel ring, 5. floating ballast bed, 6. segment, 21. first corbel portion, 22. second corbel portion, 23. sliding support, 211. mounting portion, 212. connecting portion, 213. rib, 221. fixing portion, 222. vertical portion, 223. middle rib, 224. annular rib, 231. slider, 232. slide rail, 233. limiting portion, etc., the possibility of using other terms is not excluded; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A sliding support type tunnel inner steel ring fixing structure, characterized in that: The invention comprises a standard steel ring (1), a corbel (2) and a chemical anchor (3); a plurality of the standard steel rings (1) are connected end to end and arranged on the inner ring of a pipe segment (6), and are fixed to the pipe segment (6) via the chemical anchor (3); the corbel (2) comprises a first corbel portion (21), a second corbel portion (22) and a sliding support member (23); the sliding support member (23) is located between the first corbel portion (21) and the second corbel portion (22), so that the first corbel portion (21) and the second corbel portion (22) can move up and down; the first corbel portion (21) is connected to the standard steel ring (1) and the pipe segment (6), and the second corbel portion (22) is fixed to the floating ballast (5).

2. A sliding support type tunnel inner steel ring fixing structure according to claim 1, characterized in that: It comprises a saddle steel ring (4), wherein the saddle steel ring (4) is located between laterally adjacent standard steel rings (1).

3. A sliding support type tunnel inner steel ring fixing structure according to claim 2, characterized in that: The saddle steel ring (4) and the standard steel ring (1) are connected by welding, and adjacent standard steel rings (1) are connected by welding.

4. The sliding support type tunnel inner steel ring fixing structure according to claim 1 is characterized in that: The second corbel portion (22) and the floating ballast bed (5) are connected via chemical anchor bolts (3).

5. A sliding support type tunnel tension steel ring fixing structure according to claim 4, characterized in that: The chemical anchor bolts (3) located between the standard steel ring (1) and the pipe segment (6) are anchored into the pipe segment (6) to a depth greater than or equal to 150 mm, and the spacing between the chemical anchor bolts (3) arranged circumferentially is between 400 and 500 mm.

6. The sliding support type tunnel inner steel ring fixing structure according to claim 1, characterized in that: The first corbel portion (21) comprises a connecting portion (212) and a rib plate (211), wherein the connecting portion (212) is vertically arranged and connected to the sliding support member (23), and the rib plate (211) connects the standard steel ring (1) and the connecting portion (212).

7. A sliding support type tunnel inner steel ring fixing structure according to claim 6, characterized in that: The second corbel portion (22) comprises a fixed portion (221), a vertical portion (222), an intermediate rib plate (223) and an annular rib plate (224); the fixed portion (221) is installed on the floating ballast (5); the vertical portion (222) is vertically arranged and connected to the sliding support member (23); the annular rib plate (224) connects the fixed portion (221) and the vertical portion (222); and the intermediate rib plate (223) connects adjacent annular rib plates (224).

8. The sliding support type tunnel inner steel ring fixing structure according to claim 7 is characterized in that: The sliding support member (23) comprises a slider (231), a slide rail (232) and a limiting portion (233); the slider (231) is slidably disposed on the slide rail (232); the limiting portion (233) is located on both sides of the slide rail (232) and is used to limit the movement of the slider (231).

9. A method for installing a sliding support type tunnel inner steel ring fixing structure, referring to the structure according to any one of claims 1 to 8, characterized in that: include Step 1: Clean the pipe segment (6); Step 2: Assemble the corbels (2); Step 3: Welding the first corbel part (21) of the corbel (2) to the standard steel ring (1) close to one side thereof; the first corbel part (21) of the corbel (2) is fixedly connected to the pipe segment (6) via a chemical anchor bolt (3); the second corbel part (22) of the corbel (2) is fixedly connected to the floating ballast (5) via a chemical anchor bolt (3). Step 4: Fix the remaining standard steel ring (1) to the pipe segment (6) through the chemical anchor bolt (3); Step 5: Install the saddle steel ring (4) between the laterally adjacent standard steel rings (1); Step 6: Connect the circumferentially adjacent standard steel rings (1) by welding, and connect the standard steel ring (1) and the saddle steel ring (4) by welding.

10. The method for installing a sliding support type tunnel inner steel ring fixing structure according to claim 9, characterized in that: Step 1 also includes repairing the pipe segment (6), wherein the damaged area of ​​the pipe segment (6) is greater than 0.2 m 2 , need to be repaired by grouting.

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