Prestressed structure, tensioning device and tensioning method of tunnel segments

Abstract

This invention belongs to the field of underground engineering tunnel equipment technology, and discloses a prestressed structure for tunnel boring machine (TBM) segments, a tensioning device, and a tensioning method. The prestressed structure for TBM segments includes segments, steel pipes, double-ended studs, nuts, a first washer, a clamp, and a connector. The segments have receiving holes, the steel pipes are inserted into these holes, and the double-ended studs are inserted into the steel pipes, with both ends of the studs protruding from the ends of the steel pipes. The nuts include a first nut and a second nut; the first nut is screwed to the first end of the double-ended stud, and the second nut is screwed to the second end of the double-ended stud. The first washer is fitted onto the first end of the double-ended stud and is located between the first nut and the segments. The clamp is located between the inner wall of the first washer and the outer wall of the double-ended stud. The connector has a tubular structure, with internal threads on its inner wall, and is connected to the first end of the double-ended stud. The prestressed structure for TBM segments provided by this invention can effectively prevent deformation or loosening during the shield tail disengagement process.

Description

Technical Field

[0001] This invention relates to the field of underground engineering tunnel equipment technology, and in particular to a prestressed structure for shield tunnel segments, a tensioning device, and a tensioning method. Background Technology

[0002] Tunnel boring machine (TBM) segments are the main assembly components in TBM construction. They form the innermost barrier of the tunnel, resisting soil pressure, groundwater pressure, and other special loads. TBM segments are the permanent lining structure of a shield tunnel, and their quality directly affects the overall quality and safety of the tunnel, influencing its waterproofing and durability.

[0003] After multiple tunnel segments are assembled, the advancing shield can cause insufficient tightening of the segments, gaps between segments, and water leakage. Subsequent tightening is also difficult to meet the required standards. In particular, the shield may "knock" during reception, leading to the segment detachment, broken connecting bolts, misalignment, and breakage in the receiving section. This poses serious safety hazards and severely affects the quality of the completed tunnel. Summary of the Invention

[0004] The purpose of this invention is to provide a prestressed structure, tensioning device and tensioning method for tunnel boring machine (TBM) segments, which aims to improve the structure of TBM segments, enhance their reliability, and prevent deformation or loosening during the process of exiting the shield tail.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] The prestressed structure of tunnel segments includes:

[0007] The tube segment is equipped with receiving holes;

[0008] A steel pipe is inserted into the receiving hole;

[0009] A double-ended stud is inserted into the steel pipe, with both ends of the double-ended stud protruding from both ends of the steel pipe.

[0010] The nut includes a first nut and a second nut, wherein the first nut is screwed onto the first end of the double-ended stud, and the first end of the double-ended stud extends and protrudes along the axial direction of the first nut, and the second nut is screwed onto the second end of the double-ended stud.

[0011] The first washer is fitted onto the first end of the double-ended stud and is located between the first nut and the tube segment;

[0012] A clip is disposed between the inner wall of the first washer and the outer wall of the double-ended stud;

[0013] The connector has a tubular structure, and its inner wall is provided with internal threads. One end of the connector is connected to the first end of the double-ended stud.

[0014] Optionally, the steel pipe and the pipe segment are connected by welding.

[0015] Optionally, the outer surface of the other end of the connector is provided with a snap-fit ​​protrusion.

[0016] Optionally, the shield tunnel segment prestressed structure further includes a second washer, which is disposed between the second nut and the tunnel segment.

[0017] A tensioning device for fabricating a prestressed shield tunnel segment structure as described in any of the above embodiments, the tensioning device comprising:

[0018] The jack includes a cylinder and a tensioning assembly mounted on the cylinder, the tensioning assembly being snapped into the other end of the connector;

[0019] A support foot is provided between the jack and the first washer, and the jack presses the first washer and the clamping plate through the support foot.

[0020] Optionally, the tensioning assembly includes a tensioning rod that passes through the cylinder body. Both ends of the tensioning rod extend out of both ends of the cylinder body. One end of the tensioning rod is provided with a tensioning clamp that engages with the other end of the connector. The other end of the tensioning rod is provided with a tensioning nut that abuts against the cylinder body.

[0021] Optionally, the inner wall of the tensioning clamp is recessed with a snap-fit ​​groove.

[0022] Optionally, a gasket is provided between the tension nut and the cylinder.

[0023] A method for tensioning a prestressed structure of a tunnel segment, employing a tensioning device as described in any of the above schemes, includes the following steps:

[0024] The steel pipe is installed on the segment, and the double-ended stud is inserted into the steel pipe;

[0025] The second nut is screwed onto the second end of the double-ended stud;

[0026] The clamp and the connector are installed at the first end of the double-ended stud.

[0027] Install the support legs and the jack, and snap the tensioning assembly into the other end of the connector;

[0028] Operate the jack to push the support leg to move along the axial direction of the tensioning assembly. The support leg squeezes the clamp and the first washer, so that the clamp is inserted between the inner wall of the first washer and the outer wall of the double-ended stud.

[0029] Optionally, the steps also include:

[0030] After the clamp is inserted between the inner wall of the first washer and the outer wall of the double-ended stud, the jack is depressurized, and the jack, the support foot, and the connector are removed.

[0031] The first nut and the connector are sequentially installed at the first end of the double-ended stud.

[0032] The beneficial effects of the present invention are as follows: The prestressed structure of the shield tunnel segment provided by the present invention has a steel pipe inserted into the segment, and a double-ended stud can pass through the steel pipe. The first end of the double-ended stud is fitted with a first washer and a first nut in sequence. A clamp is provided between the inner wall of the first washer and the outer wall of the double-ended stud. The first nut is tightened on the outside of the first washer, which ensures that the double-ended stud, the first washer and the clamp form a prestressed structure and avoids deformation or loosening during the process of exiting the shield tail.

[0033] The present invention also provides a tensioning device for preparing the above-mentioned prestressed structure of tunnel segment. The tensioning device includes a jack and a support foot. The tensioning component of the jack is engaged with the other end of the connector. The support foot is located between the jack and the first washer. The structure is simple and easy to install.

[0034] The present invention also provides a method for tightening the prestressed structure of a tunnel segment. Using the above-mentioned tightening device, the jack pushes the support foot to move along the axial direction of the tensioning assembly. The support foot squeezes the first washer (equivalent to the anchor plate) and the clamping plate, so that the clamping plate is inserted between the inner wall of the first washer and the outer wall of the double-ended stud. The tensioning assembly applies tension to the double-ended stud, so that prestress is formed between the double-ended stud, the first washer and the clamping plate, thereby completing the tightening of the prestressed structure of the tunnel segment. The operation is simple and convenient. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the prestressed structure of the tunnel segment provided in an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the tensioning device provided in an embodiment of the present invention installed on the prestressed structure of a tunnel segment;

[0037] Figure 3 This is a schematic diagram of two shield tunnel segment prestressed structures connected together, as provided in an embodiment of the present invention.

[0038] Figure 4 The tensioning device provided in this embodiment of the invention is installed on Figure 3 The diagram shows a prestressed structure for tunnel segments.

[0039] In the picture:

[0040] 100. Prestressed structure of tunnel segments; 200. Tensioning device;

[0041] 110. Segment; 120. Steel pipe; 130. Double-ended stud; 141. First nut; 142. Second nut; 150. Connector; 151. Snap-fit ​​protrusion; 160. First washer; 170. Second washer; 180. Clamping plate;

[0042] 210. Jack; 211. Cylinder body; 212. Tensioning assembly; 2121. Tensioning rod; 2122. Tensioning clamp; 21221. Snap-fit ​​groove; 2123. Tensioning nut; 220. Support foot; 230. Washer. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0044] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0047] like Figure 1 As shown, this embodiment provides a shield tunnel segment prestressed structure 100, which includes a tunnel segment 110, a steel pipe 120, a double-ended stud 130, a nut, a first washer 160, a clamping plate 180, and a connector 150. The tunnel segment 110 has a receiving hole, and the steel pipe 120 is inserted into the receiving hole. The double-ended stud 130 is inserted into the steel pipe 120, and its two ends protrude from both ends of the steel pipe 120, respectively. The nut includes a first nut 141 and a second nut 142. The first nut 141 is screwed onto the double-ended stud 150. The first end of the stud 130, and the first end of the double-ended stud 130 extends and protrudes along the axial direction of the first nut 141, and the second nut 142 is screwed onto the second end of the double-ended stud 130; the first washer 160 is sleeved on the first end of the double-ended stud 130 and located between the first nut 141 and the tube 110; the clamp 180 is located between the inner wall of the first washer 160 and the outer wall of the double-ended stud 130; the connector 150 has a tubular structure, the inner wall of the connector 150 is provided with internal threads, and one end of the connector 150 is connected to the first end of the double-ended stud 130.

[0048] The shield tunnel segment prestressed structure 100 provided in this embodiment has a steel pipe 120 inserted into the segment 110, and a double-ended stud 130 that can pass through the steel pipe 120. The first end of the double-ended stud 130 is sequentially fitted with a first washer 160 and a first nut 141. A clamp 180 is provided between the inner wall of the first washer 160 and the outer wall of the double-ended stud 130. The first nut 141 is tightened to the outside of the first washer 160 to ensure that the double-ended stud 130, the first washer 160 and the clamp 180 form a prestressed structure, so as to avoid deformation or loosening during the process of exiting the shield tail.

[0049] Optionally, the steel pipe 120 is pre-embedded in the segment 110 and connected to the segment 110 by seamless welding, thereby improving connection stability and reliability.

[0050] To improve the locking stability between the second nut 142 and the tube segment 110, a second washer 170 is provided between the second nut 142 and the tube segment 110.

[0051] Preferably, the outer surface of the other end of the connector 150 is provided with a snap-fit ​​protrusion 151 for snapping with an external component to make the connection stable.

[0052] like Figure 2 As shown, this embodiment also provides a tensioning device 200 for preparing the above-mentioned shield tunnel segment prestressed structure 100. The tensioning device 200 includes a jack 210 and a support leg 220. The jack 210 includes a cylinder 211 and a tensioning assembly 212 mounted on the cylinder 211. One end of the tensioning assembly 212 away from the cylinder 211 is engaged with the other end of the connector 150. The support leg 220 is located between the jack 210 and the first washer 160. The jack 210 compresses the first washer 160 and the clamping piece 180 through the support leg 220.

[0053] The tensioning device 200 provided in this embodiment includes a jack 210 and a support leg 220. The tensioning component 212 of the jack 210 is snapped into the other end of the connector 150. The support leg 220 is located between the jack 210 and the first washer 160. The structure is simple and easy to install.

[0054] Specifically, the tensioning assembly 212 includes a tensioning rod 2121, which passes through the cylinder body 211. Both ends of the tensioning rod 2121 extend out of both ends of the cylinder body 211. One end of the tensioning rod 2121 is provided with a tensioning clamp 2122, which is engaged with the other end of the connector 150. The other end of the tensioning rod 2121 is provided with a tensioning nut 2123, which abuts against the cylinder body 211 to achieve coaxial arrangement of the tensioning rod 2121 and the cylinder body 211. This allows tension to be generated along the central axis of the tensioning rod 2121, thereby providing stable and reliable tensioning of the tensioning rod 2121.

[0055] Furthermore, the inner wall of the tensioning clamp 2122 is recessed with a snap-fit ​​groove 21221, which can engage with the snap-fit ​​protrusion 151 on the outer surface of the connector 150 to achieve snap-fit.

[0056] Optionally, a gasket 230 is provided between the tension nut 2123 and the cylinder 211 to reduce the pressure of the tension nut 2123 on the cylinder 211 and protect the cylinder 211.

[0057] For example, the tensioning clamp 2122 includes two symmetrical and spaced-apart half clamps so that they can be sleeved and snapped onto the outside of the connector 150.

[0058] This embodiment also provides a method for tensioning the prestressed structure of a tunnel segment, using the aforementioned tensioning device 200, and the steps include:

[0059] S1. Install the steel pipe 120 onto the segment 110, and insert the double-ended stud 130 into the steel pipe 120;

[0060] S2, The second nut 142 is screwed onto the second end of the double-ended stud 130;

[0061] S3, clip 180, and connector 150 are installed at the first end of double-ended stud 130;

[0062] S4. Install the support legs 220 and jacks 210, and snap the end of the tensioning assembly 212 away from the cylinder 211 with the other end of the connector 150.

[0063] S5. Operate jack 210 to push support leg 220 to move along the axial direction of tensioning assembly 212. Support leg 220 squeezes clamp 180 and first washer 160, and clamp 180 is inserted between the inner wall of first washer 160 and the outer wall of double-ended stud 130.

[0064] The method for tightening the prestressed structure of the tunnel segment provided in this embodiment uses the aforementioned tightening device 200. The jack 210 pushes the support leg 220 to move axially along the tensioning assembly 212. The support leg 220 squeezes the first washer 160 (equivalent to the anchor plate) and the clamp 180, so that the clamp 180 is inserted between the inner wall of the first washer 160 and the outer wall of the double-ended stud 130. The tensioning assembly 212 tensions the double-ended stud 130, so that prestress is formed between the double-ended stud 130, the first washer 160 and the clamp 180, thus completing the tightening of the prestressed structure 100 of the tunnel segment. The operation is simple and convenient.

[0065] Furthermore, after the clamp 180 is inserted between the inner wall of the first washer 160 and the outer wall of the double-ended stud 130, the jack 210 is depressurized, and the jack 210, support leg 220, and connector 150 are removed. The first nut 141 and connector 150 are then sequentially installed at the first end of the double-ended stud 130. It should be noted that after removing the jack 210, support leg 220, and connector 150, the first nut 141 should be installed immediately to ensure that the double-ended stud 130, first washer 160, and clamp 180 form a prestressed structure.

[0066] See Figure 3 and Figure 4 After the first prestressed shield tunnel segment 100 is prepared using the above-mentioned tensioning method, the following steps can be used when assembling multiple prestressed shield tunnel segment 100s:

[0067] S10. Prepare the initial part of the prestressed structure 100 of the second shield tunnel segment. The initial part includes the segment 110, steel pipe 120, double-ended stud 130, first washer 160 and first nut 141. Assemble the above components.

[0068] S20. The second end of the double-headed stud 130 is directly installed on the connector 150 of the first shield segment prestressed structure 100. It can be understood that the second shield segment prestressed structure 100 does not require the second nut 142 and the second washer 170.

[0069] S30. Remove the first nut 141, install the clamp 180 and the connector 150, and install the tensioning device 200 at the first end of the double-ended stud 130.

[0070] S40. Operate jack 210 to insert clamp 180 between the inner wall of first washer 160 and the outer wall of double-ended stud 130.

[0071] S50, jack 210 to relieve pressure, remove jack 210, support leg 220 and connector 150, install first nut 141 and connector 150 in sequence at the first end of double-ended stud 130, and complete the connection between the second shield segment prestressed structure 100 and the first shield segment prestressed structure 100.

[0072] When assembling multiple shield tunnel segment prestressed structures 100 using the above method, since each shield tunnel segment prestressed structure 100 has a certain prestress, as the shield tunnel as a whole advances and is pulled, it can effectively prevent the single shield tunnel segment prestressed structure 100 from breaking or loosening, and can also prevent misalignment between multiple shield tunnel segment prestressed structures 100.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A tensioning device, characterized in that, This material is used to prepare a prestressed structure for tunnel boring machine (TBM) segments. The prestressed structure includes segments (110), steel pipes (120), double-ended studs (130), nuts, a first washer (160), clamps (180), and connectors (150). The segments (110) have receiving holes; the steel pipes (120) are inserted into the receiving holes; the double-ended studs (130) are inserted into the steel pipes (120), with both ends of the double-ended studs (130) protruding from both ends of the steel pipes (120); the nuts include a first nut (141) and a second nut (142). The first nut (141) is screwed onto the first end of the double-ended stud (130), and the first end of the double-ended stud (130) extends axially along the first nut (141). The second nut (142) is screwed onto the second end of the double-ended stud (130). Two ends; the first washer (160) is sleeved on the first end of the double-ended stud (130) and located between the first nut (141) and the segment (110); the clamp (180) is located between the inner wall of the first washer (160) and the outer wall of the double-ended stud (130); the connector (150) has a tubular structure, the inner wall of the connector (150) is provided with internal threads, one end of the connector (150) is connected to the first end of the double-ended stud (130), the steel pipe (120) is connected to the segment (110) by welding, the outer surface of the other end of the connector (150) is provided with a snap-fit ​​protrusion (151), the shield segment prestressed structure also includes a second washer (170), the second washer (170) is located between the second nut (142) and the segment (110), the tensioning device includes: Jack (210), the jack (210) includes a cylinder (211) and a tensioning assembly (212) mounted on the cylinder (211), the tensioning assembly (212) being engaged with the other end of the connector (150); A support foot (220) is provided between the jack (210) and the first washer (160), and the jack (210) presses the first washer (160) and the clamp (180) through the support foot (220); The tensioning assembly (212) includes a tensioning rod (2121), which passes through the cylinder (211). Both ends of the tensioning rod (2121) extend out of both ends of the cylinder (211). One end of the tensioning rod (2121) is provided with a tensioning clamp (2122), which is engaged with the other end of the connector (150). The other end of the tensioning rod (2121) is provided with a tensioning nut (2123), which abuts against the cylinder (211). The inner wall of the tensioning clamp (2122) is recessed with a snap-fit ​​groove (21221); The tensioning method of the tensioning device includes the following steps: The steel pipe (120) is installed on the segment (110), and the double-headed stud (130) is inserted into the steel pipe (120); The second nut (142) is screwed onto the second end of the double-ended stud (130); The clip (180) and the connector (150) are mounted on the first end of the double-ended stud (130); Install the support leg (220) and the jack (210), and snap the tensioning assembly (212) into the other end of the connector (150); Operate the jack (210) to push the support leg (220) to move along the axial direction of the tensioning assembly (212). The support leg (220) squeezes the clamp (180) and the first washer (160) so that the clamp (180) is inserted between the inner wall of the first washer (160) and the outer wall of the double-ended stud (130).

2. The tensioning device according to claim 1, characterized in that, A gasket (230) is provided between the tension nut (2123) and the cylinder (211).

3. The tensioning device according to claim 1, characterized in that, The steps also include: After the clamp (180) is inserted between the inner wall of the first washer (160) and the outer wall of the double-ended stud (130), the jack (210) releases the force, and the jack (210), the support leg (220) and the connector (150) are removed. The first nut (141) and the connector (150) are sequentially installed at the first end of the double-ended stud (130).

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