A shield tail adjustable support structure

Abstract

The utility model relates to a shield tail adjustable support structure, and it comprises a shield tail body, high -strength bolt, adjustable nut, fixed nut and positioning device, a plurality of adjustable support ring structures composed of high -strength bolt, adjustable nut, positioning device and fixed nut are arranged in the thin -walled structure of shield tail body, the length between high -strength bolt can be adjusted through the rotation of adjustable nut, thereby the overall rigidity and stress state of support structure are adjusted flexibly, the other end of high -strength bolt is fixed on the inner wall of shield tail body through fixed nut, the stability of support system is ensured, through this design, support structure can respond to the deformation demand of shield tail in real time, avoids local stress concentration, can strengthen the anti -deformation ability of shield tail thin -walled structure, improves the precision and safety of construction simultaneously, thereby can disperse stress, adjust support force flexibly, effectively controls deformation, and improves reliability, and is suitable for complex construction conditions.

Description

Technical Field

[0001] This utility model relates to the field of tunnel boring machine technology, and in particular to an adjustable support structure for the tail of the shield. Background Technology

[0002] A tunnel boring machine (TBM) is a piece of equipment used for tunnel construction. It consists of a main structure, a shield head, a propulsion system, and a return water system. Among these components, the shield head is primarily used to propel the tunnel, while the shield tail, located at the end of the construction process, acts as the return water pipe within the tunnel. The shield tail typically lies close to the tunnel wall, providing a channel for materials such as mud, hot water, and cold water to return to the surface. As the end part of the TBM's shell, the shield tail is formed by extending the outer steel plate and is usually connected to the middle shield (support ring) via a hinged hydraulic cylinder. Its diameter is slightly larger than the outer diameter of the tunnel lining to provide assembly space.

[0003] Under current technology, the thin-walled structure of the shield tail of a tunnel boring machine (TBM) is subjected to complex external forces during construction. Especially in the construction of large-diameter TBMs, it is prone to deformation due to insufficient rigidity, affecting accuracy and safety. Traditional fixed support structures lack flexibility and are also affected by construction techniques, resulting in high maintenance costs. Utility Model Content

[0004] The purpose of this utility model is to provide an adjustable support structure for the tail of a shield, which can distribute the force, flexibly adjust the support force, effectively control deformation, and improve reliability, and is suitable for complex construction conditions.

[0005] To achieve the above objectives, this utility model provides an adjustable support structure for the shield tail, including a shield tail body. Multiple high-strength bolts are arranged inside the thin-walled structure of the shield tail body, and these bolts are connected by adjustable nuts to form a continuous support structure. The curvature of the high-strength bolts matches the shape of the inner wall of the shield tail body and is tightly fitted to the inner wall. The rotation of the adjustable nuts can adjust the length between the high-strength bolts. One end of each high-strength bolt is fixed to the inner wall of the shield tail body by a fixing nut, which is secured by a positioning device. The high-strength bolts, the adjustable nuts, the positioning device, and the fixing nuts form an adjustable support ring structure within the shield tail body.

[0006] The positioning device includes a locking block and a locking assembly. The locking block is welded into the inner cavity of the thin-walled structure of the shield tail body. The locking assembly is detachably connected to the fixing nut and detachably connected to the locking block.

[0007] The locking assembly includes a fixed seat and a limiting seat. The fixed seat is installed on the locking block and welded to the fixing nut. The limiting seat is detachably connected to the fixed seat and fits against the outside of the fixing nut. A stabilizing component is provided between the limiting seat and the fixed seat to improve stability.

[0008] The stabilizing component includes a rectangular block and a short shaft, which are integrally formed with the limiting seat and slidably connected to the fixed seat.

[0009] Two rectangular blocks and two short axes are provided, and they are arranged symmetrically.

[0010] This utility model discloses an adjustable support structure for the shield tail. Multiple high-strength bolts are arranged inside the thin-walled structure of the shield tail body, and connected by adjustable nuts to form a continuous support structure. The curvature of the high-strength bolts matches the shape of the inner wall of the shield tail body, allowing them to fit snugly against the inner wall and disperse external forces, resulting in a more uniform distribution of support force. Rotation of the adjustable nuts adjusts the length between the high-strength bolts, thereby flexibly adjusting the overall stiffness and stress state of the support structure. The other end of each high-strength bolt is fixed to the inner wall of the shield tail body by a fixing nut, ensuring the stability of the support system. This design allows the support structure to respond in real-time to the deformation needs of the shield tail, avoiding localized stress concentration, enhancing the deformation resistance of the thin-walled structure of the shield tail, and improving construction accuracy and safety. Furthermore, it can disperse stress, flexibly adjust support force, effectively control deformation, and improve reliability, making it suitable for complex construction conditions. 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 overall structure of the adjustable support structure for the shield tail of this utility model.

[0013] Figure 2 This is a schematic diagram illustrating the setting principle of the adjustable nut of this utility model.

[0014] Figure 3 This is the utility model Figure 2 A cross-sectional view along the middle AA.

[0015] Figure 4 This is a schematic diagram of the installation of the fixing nut of this utility model.

[0016] In the diagram: 101-Shield tail body, 102-High-strength bolt, 103-Adjustable nut, 104-Fixed nut, 105-Adjustable support ring structure, 106-Clocking block, 107-Fixed seat, 108-Limiting seat, 109-Rectangular block, 110-Short shaft. 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 overall structure of the adjustable support structure at the tail of the shield. Figure 2 This is a schematic diagram illustrating the setting principle of the adjustable nut. Figure 3 yes Figure 2 Sectional view along AA, Figure 4 This is a schematic diagram of the installation of the fixing nut. This utility model provides an adjustable support structure for the shield tail: it includes a shield tail body 101, a high-strength bolt 102, an adjustable nut 103, a fixing nut 104, and a positioning device. The positioning device includes a locking block 106 and a locking assembly. The locking assembly includes a fixing seat 107 and a limiting seat 108. The stabilizing assembly includes a rectangular block 109 and a short shaft 110. This solution can distribute stress, flexibly adjust the support force, effectively control deformation, and improve reliability. It is suitable for complex construction conditions. It is understood that the aforementioned solution can respond to the deformation needs of the shield tail in real time, avoid local stress concentration, enhance the deformation resistance of the thin-walled structure of the shield tail, and improve construction accuracy and safety.

[0019] In this embodiment, the shield tail body 101 is provided with a plurality of annular inner wall cavities provided by the adjustable support ring structure 105, and they are not connected to each other.

[0020] The shield tail body 101 has a thin-walled structure with multiple high-strength bolts 102 arranged inside. These bolts are connected by adjustable nuts 103 to form a continuous support structure. The curvature of the high-strength bolts 102 matches the shape of the inner wall of the shield tail body 101 and is tightly attached to the inner wall. The rotation of the adjustable nuts 103 can adjust the length between the high-strength bolts 102. The adjustment principle of the high-strength bolts 102 is that a complete circle can be understood as a polygon composed of countless straight lines that approximate a circle, thereby achieving adjustment and flexibly adjusting the overall stiffness and stress state of the support structure. One end of each high-strength bolt 102 is fixed to the inner wall of the shield tail body 101 by a fixing nut 104, which is fixed by a positioning device. The curvature of the high-strength bolts 102 is customized according to the shape of the thin-walled inner wall of the shield tail body 101. Both ends of each high-strength bolt 102 are provided with external threads for connection with the adjustable nuts 103 and the fixing nuts 104. The high-strength bolts 102 are arranged in a ring and connected sequentially by the adjustable nuts 103 to form a ring-shaped support system, covering the entire inner wall area of ​​the shield tail. This design allows for a tight fit against the inner wall of the shield tail, effectively dispersing local stress and forming a uniform support force field. The internal thread of the adjustable nut 103 matches the external thread of the high-strength bolts 102. By rotating the adjustable nut 103, the relative length between the high-strength bolts 102 can be adjusted, thus enabling flexible adjustment of the support system. When the thin-walled structure of the shield tail is deformed by external forces, the adjustable nut 103 can be fine-tuned to adapt to the changes, ensuring that the support system always maintains its optimal state and controlling the shield tail deformation within an acceptable range. One end of each high-strength bolt 102 is fixed to the inner wall of the thin-walled shield tail by a fixing nut 104. The fixing nut 104 is made of high-strength material and can withstand the axial pressure and torque generated during construction. The arrangement of the fixing points is optimized to ensure the stability of the overall structure while facilitating installation and maintenance. The high-strength bolts 102, the adjustable nuts 103, and the fixing nuts 104 are all made of corrosion-resistant, high-strength metal materials (such as stainless steel or high-strength alloy steel) to withstand the humid and high-pressure environment during tunnel boring machine (TBM) construction. This material selection not only extends the service life of the structure but also reduces the risk of failure due to environmental factors. After the support structure is installed, the support force can be adjusted by rotating the adjustable nuts 103. During construction, adjustments can be made flexibly according to the stress state of the shield tail to ensure the stability of the shield tail structure. During maintenance, the system can be repaired by disassembling the fixing nuts 104 and replacing damaged parts, resulting in low maintenance costs and convenient operation.

[0021] The multiple high-strength bolts 102, the adjustable nuts 103, the positioning device, and the fixing nuts 104 form an adjustable support ring structure 105 within the shield tail body 101.

[0022] Secondly, the locking block 106 is welded into the inner cavity of the thin-walled structure of the tail shield body 101; the locking assembly is detachably connected to the fixing nut 104 and detachably connected to the locking block 106. The locking block 106 is welded and fixed after being inserted into the inner cavity of the thin-walled structure of the tail shield body 101, ensuring good stability. Subsequent disassembly can be performed using an oxy-acetylene torch. The locking assembly is used to limit the position of the fixing nut 104.

[0023] Then, the fixing seat 107 is installed on the locking block 106 and welded to the fixing nut 104; the limiting seat 108 is detachably connected to the fixing seat 107 and is fitted to the outside of the fixing nut 104, and a stabilizing component is provided between it and the fixing seat 107 to improve stability. The fixing seat 107 is fixed to the locking block 106 by high-strength bolts and positioning pins. The positioning pins can improve the shear resistance of the bolts and improve stability. Both the fixing seat 107 and the limiting seat 108 are provided with mating grooves that match the shape and structure of the fixing nut 104. After the fixing nut 104 is fitted into the mating groove of the fixing seat 107, its two ends are welded to the fixing seat 107 to form an integral structure. The limiting seat 108 is connected to the fixing seat 107 by countersunk bolts and positioning pins. The positioning pins can improve the shear resistance of the bolts and improve stability. The limiting seat 108 is used for protective fitting. After the fixing nut 104 is installed, the distance between it and the inner wall of the shield tail body 101 can ensure that the high-strength bolt 102 can function stably.

[0024] Furthermore, the rectangular block 109 and the short shaft 110 are integrally formed with the limiting seat 108 and slidably connected to the fixing seat 107. The fixing seat 107 is provided with sliding grooves that slidably engage with the rectangular block 109 and the short shaft 110. This allows the rectangular block 109 and the short shaft 110 to further reduce the shear stress on the fixing bolts of the limiting seat 108, thereby improving stability.

[0025] Finally, two rectangular blocks 109 and two short axes 110 are provided, and they are arranged symmetrically.

[0026] This invention, which can disperse stress, flexibly adjust support force, effectively control deformation, and improve reliability, is suitable for complex construction conditions. It arranges multiple high-strength bolts 102 inside the thin-walled structure of the shield tail body 101 and connects them with adjustable nuts 103 to form a continuous support structure. The curvature of the high-strength bolts 102 matches the shape of the inner wall of the shield tail body 101, allowing them to fit tightly against the inner wall and disperse external forces, resulting in a more uniform distribution of support force. The rotation of the adjustable nut 103 can adjust the high-strength bolts 102. The length between the high-strength bolts 102 allows for flexible adjustment of the overall stiffness and stress state of the support structure. The other end of the high-strength bolt 102 is fixed to the inner wall of the shield tail body 101 by the fixing nut 104, ensuring the stability of the support system. Through this design, the support structure can respond to the deformation requirements of the shield tail in real time, avoid local stress concentration, enhance the deformation resistance of the thin-walled structure of the shield tail, improve the accuracy and safety of construction, and further disperse the stress, flexibly adjust the support force, effectively control deformation, and improve reliability, making it suitable for complex construction conditions.

[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. An adjustable support structure for a shield tail, comprising a shield tail body (101), characterized in that: Multiple high-strength bolts (102) are arranged inside the thin-walled structure of the tail shield body (101), and the high-strength bolts (102) are connected by adjustable nuts (103) to form a continuous support structure. The curvature of the high-strength bolts (102) matches the shape of the inner wall of the tail shield body (101) and is close to the inner wall. The rotation of the adjustable nuts (103) can adjust the length between the high-strength bolts (102). One end of the high-strength bolts (102) is fixed to the inner wall of the tail shield body (101) by a fixing nut (104). The fixing nut is fixed by a positioning device. Multiple high-strength bolts (102), adjustable nuts (103), positioning devices and fixing nuts (104) form an adjustable support ring structure (105) within the shield tail body (101). The positioning device includes a locking block (106) and a locking assembly. The locking block (106) is welded into the inner cavity of the thin-walled structure of the tail shield body (101). The locking assembly is detachably connected to the fixing nut (104) and detachably connected to the locking block (106).

2. The adjustable support structure for the shield tail as described in claim 1, characterized in that: The locking assembly includes a fixed seat (107) and a limiting seat (108). The fixed seat (107) is mounted on the locking block (106) and welded to the fixing nut (104). The limiting seat (108) is detachably connected to the fixed seat (107) and fits against the outside of the fixing nut (104). A stabilizing component is provided between the limiting seat (108) and the fixed seat (107) to improve stability.

3. The adjustable support structure for the shield tail as described in claim 2, characterized in that: The stabilizing component includes a rectangular block (109) and a short shaft (110), which are integrally formed with the limiting seat (108) and slidably connected to the fixing seat (107).

4. The adjustable support structure for the shield tail as described in claim 3, characterized in that... : Two rectangular blocks (109) and two short axes (110) are respectively provided and are arranged symmetrically.

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