Tensioning device for preventing capping block duct pieces from staggering in shield section

Abstract

The utility model discloses a tensioning device for preventing the dislocation of the duct piece of a capping block in a shield section, which comprises the duct piece, chain blocks and hoisting heads, the hoisting heads are fixed in reserved bolt holes of the duct piece in a threaded manner, the two hoisting heads on two adjacent chain blocks are tensioned through the chain blocks, one end of each chain block is fixedly connected with a connecting belt, and the other end of each chain block is fixedly connected with the corresponding connecting belt. The end, away from the chain block, of the connecting belt is arranged at the lower end of one hoisting head in a sleeving mode, a lifting chain, with a lifting hook, on the chain block is bound to the lower end of the other hoisting head, and the two segments are tensioned by tensioning the lifting chain with the lifting hook; according to the utility model, after the chain block is used for tensioning, the movement condition of the duct piece is obviously reduced, the slab staggering is obviously reduced after the assembly is finished, and the stability of the duct piece is improved and the slab staggering phenomenon of the duct piece after the assembly is finished is effectively prevented through the tensioning of the chain block.

Description

Technical Field

[0001] The utility model relates to the technical field of shield tunnel construction, in particular to a tensioning device for preventing the misalignment of the closure segment in a shield tunnel. Background Art

[0002] In the shield tunneling method for tunnel construction, after the shield tunneling is completed, the segments are quickly assembled into a ring. The shield segments are the main assembled components in shield construction and are the innermost barrier of the tunnel, bearing the functions of resisting soil pressure, groundwater pressure, and some special loads.

[0003] Due to the large design angle of the closure segment and the absence of longitudinal bolts in the design of the closure segment, there is no bolt restriction after assembly. In the case where the circumferential bolts are not fully tightened, the closure segment is extruded or dropped under force, resulting in a large misalignment after assembly.

[0004] Therefore, a tensioning device for preventing the misalignment of the closure segment in a shield tunnel is proposed. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a tensioning device for preventing the misalignment of the closure segment in a shield tunnel, thereby solving or at least alleviating one or more of the above problems and other problems existing in the prior art.

[0006] To achieve the above purpose, the main technical solutions adopted by the utility model include:

[0007] A tensioning device for preventing the misalignment of the closure segment in a shield tunnel, comprising segments, a chain block, and a lifting head. The lifting head is threadedly fixed in the bolt hole reserved on the segment. The two lifting heads on two adjacent chain blocks are tightened by the chain block. One end of the chain block is fixedly connected to a connecting belt. The end of the connecting belt away from the chain block is sleeved on the lower end of one of the lifting heads. The hoisting chain with a hook on the chain block is tied to the lower end of the other lifting head. By tightening the hoisting chain with a hook, the two segments are tightened.

[0008] In a tensioning device for preventing the misalignment of the closure segment in a shield tunnel according to the utility model, further comprising a limiting member, and the limiting member is detachably installed at the lower end of the lifting head through a mounting member.

[0009] In a tensioning device for preventing the misalignment of the closure segment in a shield tunnel according to the utility model, the limiting member is L-shaped.

[0010] In a tensioning device for preventing the misalignment of the closure segment in a shield tunnel according to the utility model, the limiting member is bent into an L shape by a steel bar.

[0011] In a tensioning device for preventing the misalignment of the closure segment lining in a shield tunnel section according to the present utility model, wherein the mounting member includes an arc-shaped plate and a U-shaped rod, the lower end of the limiting member is fixedly welded to the outer side wall of the arc-shaped plate, and the arc-shaped plate is detachably fixed to the lower end of the lifting head through the U-shaped rod.

[0012] In a tensioning device for preventing the misalignment of the closure segment lining in a shield tunnel section according to the present utility model, wherein through holes are provided at both ends of the arc-shaped plate, external threads are provided at both ends of the U-shaped rod, and nuts are threadedly connected to both ends of the U-shaped rod respectively after the two ends of the U-shaped rod penetrate through the through holes.

[0013] The present utility model has at least the following beneficial effects:

[0014] After the present utility model uses a manual hoist for tensioning, the movement of the lining segments is significantly reduced, and the misalignment after assembly is significantly reduced. By tensioning with a manual hoist, the stability of the lining segments is improved, effectively preventing the phenomenon of misalignment of the lining segments after assembly;

[0015] Through the cooperation of the provided limiting member and the mounting member, when the connecting belt and the lifting chain with a hook are sleeved on the lower end of the lifting head, it can be limited, preventing the connecting belt and the lifting chain with a hook from falling off the lifting head due to their own weight when the lifting chain with a hook has not been wound up. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings:

[0017] Figure 1 is a schematic structural diagram of the tensioning device for preventing the misalignment of the closure segment lining in a shield tunnel section according to the present utility model;

[0018] Figure 2 is a partial structural diagram of the tensioning device for preventing the misalignment of the closure segment lining in a shield tunnel section according to the present utility model;

[0019] Figure 3 is an exploded structural diagram of the limiting member in the present utility model.

[0020] Explanation of the reference numerals in the drawings:

[0021] 1, lining segment; 2, manual hoist; 201, connecting belt; 202, lifting chain with a hook; 3, lifting head; 4, limiting member; 5, mounting member; 501, arc-shaped plate; 502, U-shaped rod; 503, nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will elaborate on the implementation mode of this application in conjunction with the accompanying drawings and embodiments, so as to fully understand how this application uses technical means to solve technical problems and achieve the realization process of technical effects and implement accordingly.

[0023] Please refer to Figures 1 to 3 As shown, this embodiment provides a tensioning device for preventing the misalignment of the closure segment in a shield tunnel section, including a segment 1, a chain hoist 2, and a lifting head 3. The lifting head 3 is threadedly fixed in the reserved bolt hole of the segment 1. The two lifting heads 3 on adjacent two chain hoists 2 are tensioned by the chain hoist 2. One end of the chain hoist 2 is fixedly connected with a connecting belt 201. The end of the connecting belt 201 away from the chain hoist 2 is sleeved on the lower end of one of the lifting heads 3. The hoisting chain 202 with a hook on the chain hoist 2 is tied to the lower end of the other lifting head 3. By tensioning the hoisting chain 202 with a hook, the two segments 1 are tightened.

[0024] During use, screw the lifting head 3 into the reserved bolt hole of the segment 1, sleeved the connecting belt 201 on the chain hoist 2 on the lower end of one of the lifting heads 3, sleeved the hoisting chain 202 with a hook on the lower end of the other lifting head 3. By tensioning and winding the hoisting chain 202 with a hook, the two segments 1 are tightened to achieve the purpose of preventing the misalignment of the segments.

[0025] To prevent the connecting belt 201 and the hoisting chain 202 with a hook from falling off the lifting head 3 due to their own weight when the hoisting chain 202 with a hook is not wound, a limiting member 4 is provided. Among them, the limiting member 4 is arranged in an L shape. In this embodiment, the limiting member 4 is bent into an L shape by a steel bar. The limiting member 4 is detachably installed at the lower end of the lifting head 3 through a mounting member 5. In this embodiment, the mounting member 5 includes an arc-shaped plate 501 and a U-shaped rod 502. The lower end of the limiting member 4 is fixedly welded to the outer side wall of the arc-shaped plate 501. The arc-shaped plate 501 is detachably fixed to the lower end of the lifting head 3 through the U-shaped rod 502. Among them, through holes are opened at both ends of the arc-shaped plate 501, external threads are opened at both ends of the U-shaped rod 502, and nuts 503 are threadedly fixed to the two ends of the U-shaped rod 502 respectively after the two ends of the U-shaped rod 502 penetrate through the through holes.

[0026] During use, fix the limiting member 4 at the lower end of the lifting head 3 through the arc-shaped plate 501 and the U-shaped rod 502, then screw the lifting head 3 into the reserved bolt hole of the segment 1, sleeved the connecting belt 201 on the chain hoist 2 on the lower end of one of the lifting heads 3, sleeved the hoisting chain 202 with a hook on the lower end of the other lifting head 3. By tensioning and winding the hoisting chain 202 with a hook, the two segments 1 are tightened to achieve the purpose of preventing the misalignment of the segments.

[0027] The above description shows and describes several preferred embodiments of the present utility model. However, as previously mentioned, it should be understood that the present utility model is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And any changes and variations made by those skilled in the art without departing from the spirit and scope of the present utility model shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A tensioning device for preventing the misalignment of the closure segment in a shield tunnel section, characterized in that, It includes segment (1), chain block (2) and lifting head (3). The lifting head (3) is fixed to the reserved bolt hole of the segment (1) by threading. The two lifting heads (3) on two adjacent chain blocks (2) are tightened by the chain block (2). One end of the chain block (2) is fixedly connected with a connecting belt (201). The end of the connecting belt (201) far from the chain block (2) is sleeved on the lower end of one of the lifting heads (3). The lifting chain (202) with a hook on the chain block (2) is tied to the lower end of the other lifting head (3). By tightening the lifting chain (202) with a hook, the two segments (1) are tightened.

2. The tensioning device for preventing the misalignment of the closure segment in the shield tunnel section according to claim 1, wherein: It further includes a limiting member (4). The limiting member (4) is detachably installed at the lower end of the lifting head (3) through a mounting member (5).

3. A tensioning device for preventing the misalignment of the closure segment in a shield tunnel section according to claim 2, characterized in that: The limiting member (4) is arranged in an L shape.

4. A tensioning device for preventing the misalignment of the closure segment lining in a shield tunnel section according to claim 3, characterized in that: The limiting member (4) is bent into an L shape from a steel bar.

5. A tensioning device for preventing the misalignment of the closure segment in a shield tunnel section according to claim 4, characterized in that: The mounting member (5) includes an arc-shaped plate (501) and a U-shaped rod (502). The lower end of the limiting member (4) is fixedly welded to the outer side wall of the arc-shaped plate (501). The arc-shaped plate (501) is detachably fixed to the lower end of the lifting head (3) through the U-shaped rod (502).

6. The tensioning device for preventing the misalignment of the closure segment in a shield tunnel section according to claim 5, characterized in that: Through holes are formed at both ends of the arc-shaped plate (501). External threads are formed at both ends of the U-shaped rod (502). Both ends of the U-shaped rod (502) respectively penetrate through the through holes and are threadedly fixed and connected with nuts (503).

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