Prestressed shield segment structure and construction device thereof

Abstract

The utility model discloses a prestress shield segment structure which comprises a shield segment, at least one sinking groove is formed in the outer wall of the shield segment, the two ends of each sinking groove are crossed and penetrate to the inner wall of the shield segment, and the two ends of each sinking groove are arranged in a staggered mode in the axial direction of the shield segment. The outer side of each sinking groove is provided with a limiting structure used for limiting deviation of the prestressed steel beam in the cable penetrating process. According to the prestressed shield segment structure, prestressed duct grouting procedures are reduced, pre-buried ducts are reduced, and cost is reduced. The utility model further discloses a prestressed shield segment construction device which can greatly improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of rail transit engineering technology, and more specifically, it relates to a prestressed shield tunnel segment structure and its construction device. Background Technology

[0002] In shield tunnel segment projects, circumferential prestressing is often used to form prestressed shield segments, which offers numerous advantages such as increased segment strength, reduced gaps between segments, and reduced reinforcement requirements. Currently, shield segments commonly use internal prestressing systems. For example, in the high-stiffness, low-reinforcement prestressed shield tunnel structure and its construction method disclosed in announcement number CN112780304B, it is necessary to reserve ducts in the shield segments. The formation of these ducts requires the pre-embedding of corrugated pipes or steel pipes, as well as grouting, which increases project costs and reduces construction efficiency, making it difficult to meet the tunneling cycle of the shield machine.

[0003] Therefore, there is an urgent need to design a new type of prestressed shield tunnel segment structure and its construction device to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the above-mentioned shortcomings of the existing technology. One of the purposes of this utility model is to provide a prestressed shield tunnel segment structure that reduces the grouting process of prestressed ducts, reduces the number of pre-embedded ducts, and lowers costs.

[0005] The second objective of this utility model is to provide a prestressed shield tunnel segment construction device to improve construction efficiency.

[0006] To achieve the above objective, this utility model provides a prestressed shield tunnel segment structure, including shield tunnel segments. The outer wall of the shield tunnel segment is provided with at least one groove. The two ends of each groove intersect and penetrate into the inner wall of the shield tunnel segment. The two ends of each groove are staggered along the axial direction of the shield tunnel segment. The outer side of each groove is provided with a limiting structure for restricting the prestressed steel strands from deviating during cable threading.

[0007] As a further improvement, the two ends of each of the aforementioned troughs intersect at the bottom of the tunnel lining segments.

[0008] Furthermore, each of the shield tunnel segments at both ends of the aforementioned sinkhole is provided with anchor grooves on its inner wall.

[0009] Furthermore, the tunnel segment includes a split toothed segment, side segments and a top segment. The top segment and the toothed segment are arranged vertically, and both ends of the top segment and the toothed segment are connected by at least one side segment.

[0010] Furthermore, the limiting structure consists of multiple baffles, which are spaced apart and mounted on the outside of the settling tank.

[0011] Furthermore, the limiting structure is an arc-shaped mesh that covers the outside of the settling tank.

[0012] To achieve the second objective mentioned above, this utility model provides a prestressed shield tunnel segment construction device, including a guiding device. The guiding device includes a guide head, a connecting rod, and a connector, which are connected in sequence. The connecting rod has an elastic structure around its periphery. The elastic structure includes a spring and a spring plate. One end of the spring plate is connected to the guide head or the connecting rod, and the other end is connected to one end of the spring. The other end of the spring is connected to the connecting rod. In the initial state, the distance between the other end of the spring plate and the connecting rod is greater than the distance between the limiting structure and the bottom of the settling trench.

[0013] Furthermore, there are three elastic structures in total, and the three elastic structures are located on three sides of the connecting rod respectively.

[0014] Furthermore, the outer wall of the spring is provided with a roller, which is a universal wheel.

[0015] Furthermore, the outer wall of the spring is provided with ball bearings, which are movably embedded within the spring, providing a beneficial effect.

[0016] Compared with the prior art, the advantages of this utility model are as follows:

[0017] 1. The prestressed shield tunnel segment structure of this utility model involves setting a sinking groove on the outside of the shield tunnel segment. The two ends of the sinking groove intersect and penetrate to the inner wall of the shield tunnel segment. After the tunnel segment at the rear end of the shield machine is assembled, the prestressed steel strands are inserted from one end of the sinking groove to the other end and then anchored. Secondary grouting can then be performed on the outside of the segment. This segment structure does not require pre-embedded corrugated pipes or steel pipe forming ducts. Only the mold needs to be improved, and it is integrally formed, which reduces the cost of the segment and improves the production efficiency of the segment. At the same time, the duct grouting is carried out together with the segment grouting, eliminating the duct grouting process and improving construction efficiency. There is no need to add prestressed duct grouting equipment and grout in the tunnel, which improves the space utilization rate inside the shield machine.

[0018] 2. The prestressed shield tunnel segment construction device of this utility model is used to insert prestressed steel strands into the caisson. During the insertion, the guide device is fixed at the front end of the prestressed steel strand. The guide device drives the prestressed steel strand from one end of the caisson to the other end. With the cooperation of the limiting structure and the elastic structure, the guide device is always located in the caisson, thereby realizing the rapid encapsulation of the prestressed steel strand in the caisson outside the shield tunnel segment and improving construction efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the front cross-sectional structure of the shield tunnel segment in this utility model;

[0020] Figure 2 This is a schematic diagram of the shield tunnel segment structure from below in this utility model. Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the shield tunnel segment structure from below in this utility model. Figure 2 ;

[0022] Figure 4 This is a schematic diagram of the main structure of the guide device in this utility model;

[0023] Figure 5 This is a front view cross-sectional structural diagram of the guide device in this utility model.

[0024] Among them: 1-shield segment, 2-sinking channel, 3-anchor groove, 4-baffle plate, 5-arc mesh, 6-guide head, 7-connecting rod, 8-connector, 9-spring, 10-spring, 11-top segment, 12-side segment, 13-toothed segment. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0026] See Figure 1-5 This utility model discloses a prestressed shield tunnel segment structure, including a shield segment 1. The shield segment 1 comprises a split toothed block segment 11, side segments 12, and a top segment 13. The top segment 13 and the toothed block segment 11 are arranged vertically, and both ends of the top segment 13 and the toothed block segment 11 are connected by at least one side segment 12, forming a circular tunnel segment. The split segment structure is easy to prefabricate and facilitates construction. The corresponding grooves 2 between adjacent toothed block segments 11, side segments 12, and top segments 13 should be aligned to facilitate the threading and anchoring of prestressed steel strands.

[0027] At least one sinker 2 is provided on the outer wall of the shield tunnel segment 1. More prestressed steel strands and corresponding sinkers 2 can be set according to the size of the segment structure and the load. The sinker 2 is a groove that is concave downward from the outer wall of the shield tunnel segment 1, and the bottom of the groove is an arc-shaped structure, which is adapted to the prestressed steel strands and can better apply prestress. The sinker is set on the outer wall surface of the shield tunnel segment 1. The size of the sinker 2 can be designed to be larger than the cross-sectional area of ​​the prestressed reserved hole, so that there is more space for the prestressed steel strands to be threaded and the threading is more convenient. The two ends of each sinker 2 intersect and penetrate into the inner wall of the shield tunnel segment 1, so as to realize the threading and anchoring construction inside the shield tunnel segment 1. The two ends of each sinker 2 are staggered along the axial direction of the shield tunnel segment 1 to avoid interference. The outer side of each sinker 2 is provided with a limiting structure to restrict the prestressed steel strands from deviating during the threading, so as to prevent the prestressed steel strands from deviating from the sinker 2.

[0028] This utility model discloses a prestressed shield tunnel segment structure. By setting a sinkhole 2 on the outside of the shield tunnel segment 1, the two ends of the sinkhole 2 intersect and penetrate to the inner wall of the shield tunnel segment 1. After the tunnel segments at the rear end of the shield machine are assembled, the prestressed steel strands are inserted from one end of the sinkhole 2 to the other end and then anchored. Secondary grouting can then be performed on the outside of the segment. This segment structure does not require pre-embedded corrugated pipes or steel pipe forming channels. It only requires improved molds and integral molding, reducing the number of sealing accessories between the segment channels and the number of pre-embedded grouting accessories, thereby reducing the segment cost and improving the segment production efficiency. At the same time, the channel grouting is carried out together with the segment grouting, eliminating the channel grouting process and improving construction efficiency. There is no need to add prestressed channel grouting equipment and grout inside the tunnel, thereby improving the space utilization rate inside the shield machine.

[0029] Preferably, the two ends of each sinkhole 2 intersect at the bottom of the shield segment 1, so that the operation can be carried out at the bottom of the shield segment 1 when threading cables or anchoring, making construction more convenient.

[0030] Preferably, each end of the sinkhole 2 is provided with an anchor groove 3 on the inner wall of the shield segment 1, which facilitates the installation of prestressed steel strand anchors.

[0031] Preferred, such as Figure 2 As shown, in this embodiment, the limiting structure consists of multiple baffles 4, which are spaced apart and installed on the outside of the settling trench 2. The baffles 4 can be connected to the shield tunnel segments 1 by screws or rivets to achieve fixed installation. In this embodiment, the multi-baffle limiting structure makes it easier for grout to enter the settling trench 2 during grouting.

[0032] like Figure 3 As shown, in another embodiment, the limiting structure is an arc-shaped mesh 5, which covers the outside of the settling trench 2. The arc-shaped mesh 5 can be connected to the shield tunnel segment 1 by screws or rivets to achieve fixed installation of the arc-shaped mesh. In this embodiment, the limiting structure of the arc-shaped mesh allows grout to flow into the settling trench 2 through the mesh openings of the arc-shaped mesh 5 during grouting. During cable threading, the fully covered arc-shaped mesh 5 can limit the guiding device in real time, making cable threading more convenient.

[0033] A prestressed shield tunnel segment construction device includes a guiding device comprising a guide head 6, a connecting rod 7, and a connector 8. The guide head 6, connecting rod 7, and connector 8 are connected sequentially. An elastic structure is provided around the connecting rod 7, comprising a spring 9 and a spring 10. One end of the spring 9 is connected to the guide head 6 or the connecting rod 7, and the other end is connected to one end of the spring 10. The other end of the spring 10 is connected to the connecting rod 7, such that the end of the spring 9 away from the guide head 6 is higher than the diameter of the guide head 6 and is in an inclined state. In the initial state, the distance between the other end of the spring 9 and the connecting rod 7 is greater than the distance between the limiting structure and the bottom of the sinkhole 2, so that the guide head 6 is always in the sinkhole 2 under the limiting action of the limiting structure.

[0034] This utility model discloses a prestressed shield tunnel segment construction device, which is used to insert prestressed steel strands into the sinkhole 2. During the insertion, a guide device is fixed at the front end of the prestressed steel strand. The guide device drives the prestressed steel strand from one end of the sinkhole 2 to the other end. With the cooperation of the limiting structure and the elastic structure, the guide device is always located in the sinkhole, thereby realizing the rapid encapsulation of the prestressed steel strand in the sinkhole outside the shield tunnel segment, improving construction efficiency.

[0035] Preferably, there are three elastic structures, which are located on three sides of the connecting rod 7. During the cable threading process, the side without the elastic piece is oriented towards the center of the tube segment, so that the guide head 6 can always be close to the inner side of the sink 2, making cable threading more convenient.

[0036] Preferably, a roller is provided on the outer wall of the spring piece 9. The roller is a universal wheel. The roller makes contact with the inner wall of the sink 2 to form a rolling contact, which can reduce the friction between the guide device and the tube segment and reduce the difficulty of threading the cable.

[0037] In another embodiment, a ball bearing can also be provided on the outer wall of the spring sheet 9. The ball bearing is embedded in the spring sheet 9, which can also reduce the friction between the guide device and the tube segment and reduce the difficulty of threading the cable.

[0038] The construction method of the prestressed shield tunnel segments of this utility model is as follows:

[0039] Step 1: Prefabricate shield tunnel segments (including toothed segment 11, side segment 12 and top segment 13) and install limiting structures on the shield tunnel segments;

[0040] Step 2: Loosen the shield machine propulsion cylinder at the bottom toothed segment, assemble the bottom toothed segment, and then tighten the shield machine propulsion cylinder against the toothed segment.

[0041] Step 3: Continue installing the side segments and top segments as in Step 2;

[0042] Step 4: Prestressed steel strand connection guide device (connecting the prestressed steel strand to the connector);

[0043] Step 5: Insert the prestressed steel strands into the caisson from one end until they emerge from the other end of the caisson, with the side of the guide device without spring clips facing the center of the tunnel.

[0044] Step 6: Remove the guide device, install the anchor and apply prestress to the prestressed steel strand, and install the anchor end protective cover;

[0045] Step 7: Open the vent holes of the anchorage protective covers at both ends and perform secondary grouting on the outside of the segments. When the grout flows out of the vent holes evenly, close the vent holes to complete the secondary grouting.

[0046] The construction method of this embodiment can quickly complete the application of prestress and grouting of the segments, improve construction efficiency, and eliminate the need for grouting holes in the anchor plate. Only one vent hole needs to be set on the protective cover, which can reduce costs.

[0047] The above are merely preferred embodiments of this utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these will not affect the implementation effect of this utility model or the practicality of the patent.

Claims

1. A prestressed shield tunnel segment structure, comprising shield tunnel segments (1), characterized in that, The outer wall of the shield segment (1) is provided with at least one sinker (2), the two ends of each sinker (2) intersect and penetrate to the inner wall of the shield segment (1), and the two ends of each sinker (2) are staggered along the axial direction of the shield segment (1). The outer side of each sinker (2) is provided with a limiting structure for restricting the prestressed steel strands from deviating during cable threading.

2. The prestressed shield tunnel segment structure according to claim 1, characterized in that, The two ends of each of the aforementioned sluices (2) intersect at the bottom of the shield segment (1).

3. A prestressed shield tunnel segment structure according to claim 1, characterized in that, Anchor grooves (3) are provided on the inner walls of the shield segments (1) at both ends of each of the aforementioned sluices (2).

4. A prestressed shield tunnel segment structure according to claim 1, characterized in that, The shield tunnel segment (1) includes a split toothed segment (11), side segments (12) and a top segment (13). The top segment (13) and the toothed segment (11) are arranged vertically, and both ends of the top segment (13) and the toothed segment (11) are connected by at least one side segment (12).

5. A prestressed shield tunnel segment structure according to any one of claims 1-4, characterized in that, The limiting structure consists of multiple baffles (4), which are spaced apart and mounted on the outside of the settling tank (2).

6. A prestressed shield tunnel segment structure according to any one of claims 1-4, characterized in that, The limiting structure is an arc-shaped mesh (5), which covers the outside of the settling trough (2).

7. A construction device for a prestressed shield tunnel segment structure according to claim 1, characterized in that, The device includes a guide device, which includes a guide head (6), a connecting rod (7), and a connector (8). The guide head (6), the connecting rod (7), and the connector (8) are connected in sequence. The connecting rod (7) has an elastic structure on its periphery. The elastic structure includes a spring (9) and a spring (10). One end of the spring (9) is connected to the guide head (6) or the connecting rod (7), and the other end is connected to one end of the spring (10). The other end of the spring (10) is connected to the connecting rod (7). In the initial state, the distance between the other end of the spring (9) and the connecting rod (7) is greater than the distance between the limiting structure and the bottom of the sinkhole (2).

8. The construction device according to claim 7, characterized in that, There are three elastic structures, which are located on three sides of the connecting rod (7).

9. The construction device according to claim 7, characterized in that, The outer wall of the spring piece (9) is provided with a roller, which is a universal wheel.

10. The construction device according to claim 7, characterized in that, The outer wall of the spring piece (9) is provided with ball bearings, which are movably embedded in the spring piece (9).

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