Shield tail block splicing structure fastened by bolts

Abstract

The utility model relates to a shield tail piece splicing structure adopting bolt fastening, including shield tail piece main part and connecting mechanism, the shield tail piece main part is provided with the step conical surface, one shield tail piece main part's step conical surface is provided with the connecting thread hole, and with the step conical surface of the side of setting up the connecting thread hole cooperation shield tail piece main part is provided with the through countersunk hole, through piece design and adopting step conical surface structure, its conical surface shape can ensure that the piece realizes self -positioning and self -fastening function when assembling, the preliminary alignment of each piece is carried out through manual guidance in the assembling process, then through connecting mechanism and firmly fixed together, the step conical surface structure is through the even distribution of the force when assembling on the splicing surface through the taper angle design, reduces the local stress concentration, improves the overall strength and reliability of structure, and can optimize the connecting structure and replace traditional welding and gas cutting mode, greatly improves the installation and dismounting efficiency.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine technology, and in particular to a segmented splicing structure for the tail of the shield that is fastened with bolts. Background Technology

[0002] A tunnel boring machine (TBM) is a specialized engineering machine used for tunnel excavation. It is mainly used in the construction of tunnels for subways, railways, highways, and municipal projects, and has functions such as excavating soil, transporting excavated soil, and assembling tunnel linings.

[0003] Due to their large diameter, the tail section of existing tunnel boring machines (TBMs) typically relies on welding and gas cutting for installation and dismantling. However, this traditional method has significant drawbacks: firstly, welding and gas cutting are complex, labor-intensive, and inefficient; secondly, these methods require substantial equipment and materials, resulting in high costs; and more importantly, the precision of welded connections is easily affected by human error and environmental conditions, failing to meet the requirements of high-precision assembly. Therefore, designing a modular splicing technology for the tail section structure that enables rapid assembly and dismantling while maintaining high assembly precision and safety has become an urgent need for the industry. Utility Model Content

[0004] The purpose of this invention is to provide a segmented splicing structure for the tail shield that is fastened with bolts, which can optimize the connection structure and replace traditional welding and gas cutting methods, thereby greatly improving the efficiency of installation and disassembly.

[0005] To achieve the above objectives, this utility model provides a shield tail segment splicing structure fastened with bolts, including a shield tail segment body, wherein the shield tail segment body is provided with a stepped conical surface, and the stepped conical surfaces on two shield tail segment bodies can fit together and are connected and fixed by a connecting mechanism after fitting together. One of the shield tail segment main bodies has a connecting threaded hole on the stepped conical surface, and the shield tail segment main body that mates with the stepped conical surface on the side with the connecting threaded hole has a through countersunk hole, with the countersunk hole aligned with the connecting threaded hole.

[0006] When the shield tail section body is assembled, a first sealing element is provided to reduce the entry of external impurities into the connecting threaded hole. The first sealing element is a U-shaped rubber gasket, which is directly installed on the stepped cone surface of the shield tail section body where the connecting threaded hole is provided.

[0007] The connecting mechanism includes a circular limiting block and a connecting rod. The circular limiting block is detachably connected to the shield tail section body with countersunk holes. The connecting rod is integrally formed with the circular limiting block and is threadedly connected to the shield tail section body with threaded connecting holes.

[0008] The circular limiting block is provided with a second sealing element, which fits against the shield tail section body with countersunk holes when the circular limiting block is installed.

[0009] The second sealing element can be disposed in a semi-circular groove or annular rectangular groove on the circular limiting block.

[0010] This utility model discloses a segmented splicing structure for a shield tail secured with bolts. Firstly, the stepped conical surface of each segment is machined using a CNC machine tool to ensure high precision in the conical surface fit. Then, during on-site assembly, each segment is moved sequentially to its installation position according to the design order, further aligning the stepped conical surfaces and allowing the segments to be naturally positioned. Next, they are connected via a connecting mechanism and tightened sequentially to the specified torque using a torque wrench to ensure a secure connection between the segments. This application, through its segmented design and the use of a stepped conical surface structure, ensures that the segments achieve self-positioning and self-tightening functions during assembly. During assembly, each segment is initially aligned manually, and then the connecting mechanism securely fixes the segments together. The stepped conical surface structure, through its conical angle design, evenly distributes the force during assembly on the splicing surface, reducing local stress concentration and thus improving the overall strength and reliability of the structure. Disassembly and installation are also more convenient, thereby optimizing the connection structure and replacing traditional welding and gas cutting methods, significantly improving installation and disassembly efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0012] Figure 1 This is a schematic diagram of the stepped cone surface of the shield tail segmented splicing structure using bolt fastening, which is a feature of this utility model.

[0013] Figure 2 This is a schematic diagram of the structure of the multiple shield tail sections of this utility model after being spliced ​​and fixed.

[0014] Figure 3 This is the utility model Figure 2 Enlarged view of point A in the middle.

[0015] Figure 4 This is a schematic diagram showing the installation position of the second sealing element of this utility model.

[0016] In the figure: 101-Shield tail block body, 102-Stepped conical surface, 103-Connecting threaded hole, 104-First seal, 105-Circular limit block, 106-Connecting rod, 107-Second seal. Detailed Implementation

[0017] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0018] like Figures 1 to 4 As shown, where Figure 1 This is a schematic diagram of the stepped conical surface of a segmented shield tail assembly structure secured with bolts. Figure 2 This is a schematic diagram of the structure after multiple shield tail sections are spliced ​​and fixed together. Figure 3 yes Figure 2 Enlarged view of point A in the middle. Figure 4 This is a schematic diagram showing the location of the second sealing element. This utility model provides a bolt-fastened segmented shield tail assembly structure, including a shield tail segment body 101 and a connecting mechanism. The shield tail segment body 101 has a stepped conical surface 102. One of the stepped conical surfaces 102 of the shield tail segment body 101 has a connecting threaded hole 103, and the shield tail segment body 101 that mates with the stepped conical surface 102 on that side has a through countersunk hole. The connecting mechanism includes a circular limiting block 105 and a connecting rod 106. This solution optimizes the connection structure and replaces traditional welding and gas cutting methods, significantly improving installation and disassembly efficiency. It is understood that this solution improves the overall strength and reliability of the structure, and makes disassembly and installation more convenient.

[0019] In this embodiment, the shield tail section body 101 is made of high-strength steel to ensure that its mechanical properties meet the requirements for use of the shield tail.

[0020] The shield tail section body 101 is provided with a stepped conical surface 102. The stepped conical surfaces 102 on two shield tail section bodies 101 can fit together and are connected and fixed by a connecting mechanism after fitting. The stepped conical surfaces 102 are machined by CNC machine tools to ensure high precision of the conical surface fit. The connecting mechanism is used to connect the two shield tail section bodies 101 after their ends are fitted together.

[0021] One of the shield tail block bodies 101 has a connecting threaded hole 103 on the stepped conical surface 102, and the shield tail block body 101 that cooperates with the stepped conical surface 102 on the side with the connecting threaded hole 103 has a through countersunk hole, which is aligned with the connecting threaded hole 103.

[0022] Secondly, during the splicing of the shield tail section body 101, a first sealing element 104 is provided to reduce the entry of external impurities into the connecting threaded hole 103. The first sealing element 104 is a U-shaped rubber gasket and is directly installed on the stepped conical surface 102 of the shield tail section body 101 where the connecting threaded hole 103 is provided. A U-shaped mounting groove is provided on the stepped conical surface 102 where the connecting threaded hole 103 is provided. The mounting groove is located outside the connecting threaded hole 103 to facilitate the direct installation of the first sealing element 104. After the first sealing element 104 is installed, the two shield tail section bodies 101 are connected and fixed by the connecting mechanism to seal, reducing the entry of external water and other impurities into the connecting threaded hole 103.

[0023] Then, the circular limiting block 105 is detachably connected to the shield tail section body 101 with the countersunk hole; the connecting rod 106 is integrally formed with the circular limiting block 105 and is threadedly connected to the shield tail section body 101 with the connecting threaded hole 103. The circular limiting block 105 and the connecting rod 106 form a T-shaped structure, and the stepped threaded end on the connecting rod 106 directly engages with the connecting threaded hole 103 to achieve connection.

[0024] Furthermore, a second sealing element 107 is provided on the circular limiting block 105. The second sealing element 107 adheres to the shield tail section body 101 with the countersunk hole during installation of the circular limiting block 105. The second sealing element 107 is used to seal the circular limiting block 105 against the countersunk hole step surface during installation.

[0025] Finally, the second sealing element 107 can be disposed in a semi-circular groove or annular rectangular groove on the circular limiting block 105. When the second sealing element 107 is an O-ring rubber component, a semi-circular groove is provided on the circular limiting block 105 for the installation of the second sealing element 107. When the second sealing element 107 is an O-ring rubber gasket, an annular rectangular groove is provided on the circular limiting block 105 for the installation of the second sealing element 107.

[0026] When using this utility model to optimize the connection structure and replace traditional welding and gas cutting methods, significantly improving installation and disassembly efficiency, firstly, the stepped conical surface 102 of each shield tail sub-block body 101 is machined using a CNC machine tool to ensure high precision of the conical surface fit. Then, during on-site assembly, each sub-block is moved to the installation position in the design sequence to further align the stepped conical surface 102, allowing the sub-blocks to be naturally positioned. Then, they are connected through the connection mechanism and tightened sequentially to the specified torque using a torque wrench to ensure a firm connection between each sub-block. This application, through its sub-block design and the use of the stepped conical surface 102 structure, ensures that the conical surface shape can guarantee the... The shield tail section 101 achieves self-positioning and self-fastening functions during assembly. During the assembly process, each section is initially aligned by manual guidance. Then, the sections are firmly fixed together by the connecting mechanism. The stepped conical surface 102 structure distributes the force during assembly evenly on the splicing surface through the cone angle design, reducing local stress concentration, thereby improving the overall strength and reliability of the structure. Disassembly and installation are also more convenient. During disassembly, the circular limiting block 105 and the connecting rod 106 structure are released one by one in reverse order, and the sections naturally separate. This optimizes the connection structure and replaces traditional welding and gas cutting methods, greatly improving the efficiency of installation and disassembly.

[0027] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A segmented shield tail assembly structure fastened with bolts, comprising a main body of segmented shield tail sections, characterized in that: The shield tail section body is provided with a stepped conical surface. The stepped conical surfaces on the two shield tail section bodies can fit together and are connected and fixed by a connecting mechanism after fitting. One of the shield tail segment main bodies has a connecting threaded hole on the stepped conical surface, and the shield tail segment main body that mates with the stepped conical surface on the side with the connecting threaded hole has a through countersunk hole, with the countersunk hole aligned with the connecting threaded hole.

2. The bolt-fastened segmented shield tail assembly structure as described in claim 1, characterized in that: When the shield tail section body is assembled, the first sealing element reduces the entry of external impurities into the connecting threaded hole. The first sealing element is a U-shaped rubber gasket, which is directly installed on the stepped cone surface of the shield tail section body where the connecting threaded hole is located.

3. The bolt-fastened segmented shield tail assembly structure as described in claim 1, characterized in that: The connecting mechanism includes a circular limiting block and a connecting rod. The circular limiting block is detachably connected to the shield tail section body with countersunk holes. The connecting rod is integrally formed with the circular limiting block and is threadedly connected to the shield tail section body with threaded connecting holes.

4. The bolt-fastened segmented shield tail assembly structure as described in claim 3, characterized in that: The circular limiting block is provided with a second sealing element, which fits against the shield tail section body with countersunk holes when the circular limiting block is installed.

5. The bolt-fastened segmented shield tail assembly structure as described in claim 4, characterized in that... : The second seal can be disposed in a semi-circular groove or annular rectangular groove on the circular limiting block.

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