Shield tunneling machine jack with duct piece corner waterproof sealing gasket limiting function and shield duct piece assembling method

Abstract

The invention relates to a shield tunneling machine jack with a duct piece corner waterproof sealing gasket limiting function and a shield duct piece splicing method. The shield tunneling machine jack comprises a jack body and a sealing gasket limiting device. The sealing gasket limiting device comprises an installation frame installed at the execution end of the jack body and a pressing block arranged on the installation frame, and the pressing block is configured in the mode that when the jack body pushes a target duct piece, the pressing block can prevent a corner longitudinal seam sealing piece on at least one side of the target duct piece from being extruded out of a duct piece longitudinal seam. The sealing gasket limiting device is integrated on the jack, the longitudinal joint sealing piece is actively and physically prevented from being extruded out of the pipe piece longitudinal joint in the pipe piece splicing process, the integrity and reliability of the waterproof sealing line of the pipe piece longitudinal joint are guaranteed, and the leakage risk of a shield tunnel is remarkably reduced; the sealing gasket limiting device serves as an accessory part of the jack, synchronously moves along with the jack body, does not need an additional independent operation process, is seamlessly connected with an existing splicing process, and ensures the construction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of shield tunnel engineering technology, specifically relating to a shield machine jack with a waterproof sealing gasket limiting function at the corner of the tunnel segment and a shield segment assembly method. Background Technology

[0002] A shield tunnel is an underground engineering structure that uses a shield machine to excavate and simultaneously assemble precast concrete segments 200 to form a lining. Joints are formed between the segments 200, and elastic waterproof seals (usually rubber gaskets) are installed at the joints to achieve waterproofing. The joints are mainly divided into two types: circumferential joints (joints between adjacent segment rings) and longitudinal joints (joints between adjacent segments 200 within the same segment ring).

[0003] like Figure 1 and Figure 2 During the assembly of shield tunnel segments 200, there is a process of mutual compression and relative sliding between the longitudinal joint seals 100 of the later-assembled segments 200 and the longitudinal joint seals 100 of the earlier-assembled segments 200. This causes the tail of the longitudinal joint seal 100 of the later-assembled segments 200 to detach from the seal groove. The extruded longitudinal joint seal 100 forms a seal accumulation 101 at the segment joint, creating a leakage channel and causing leakage at the segment joint, thus affecting the waterproofing effect of the shield tunnel. Currently, to overcome the above problems, the following existing technologies exist:

[0004] 1) Apply adhesive to the groove surface to adhere the longitudinal joint seal 100 to the groove. However, in order to overcome the high water pressure, the contact pressure between the longitudinal joint seals 100 increases and the friction is greater. After the longitudinal joint seal 100 is adhered to the groove, it is easy for the seal to be pulled, which will lead to damage to the longitudinal joint seal 100.

[0005] 2) During construction, measures are taken to minimize the relative sliding distance of the seals, apply friction-reducing agents to the contact surfaces of the longitudinal joint seals 100, and add high-strength fibers to the longitudinal joint seals 100 to improve their tensile strength. However, these methods are subject to many random factors during construction, making it impossible to avoid the phenomenon of seal extrusion. Summary of the Invention

[0006] This invention relates to a shield machine jack with a waterproof sealing gasket limiting function at the corner of the tunnel segment and a shield tunnel segment assembly method, which can at least solve some of the defects of the prior art.

[0007] This invention relates to a tunnel boring machine jack with a segment corner waterproof sealing gasket limiting function, comprising a jack body and a sealing gasket limiting device. The sealing gasket limiting device includes a mounting frame installed on the execution end of the jack body and a pressure block disposed on the mounting frame. The pressure block is configured such that when the jack body pushes the target segment, the pressure block can prevent the corner longitudinal seam seal of at least one side of the target segment from being squeezed out from the longitudinal seam of the segment.

[0008] As one implementation method, the position of the pressure block satisfies the following condition: when the jack body pushes the target segment, the pressing surface of the pressure block faces and abuts against the corner section of the longitudinal seam seal on the corresponding side of the target segment.

[0009] As one embodiment, the sealing gasket limiting device further includes a first adjusting mechanism for adjusting the distance between the pressure block and the output end of the jack body in the axial direction of the jack.

[0010] As one embodiment, the first adjustment mechanism includes an adjustment screw, the axis of which is parallel to the axial direction of the jack, the adjustment screw is threadedly connected to the mounting bracket, and the pressure block is mounted on the adjustment screw.

[0011] As one embodiment, the sealing gasket limiting device further includes a second adjustment mechanism for adjusting the distance between the pressure block and the axis of the jack in the radial direction.

[0012] As one embodiment, the execution end of the jack body includes the output end of the jack body and a liner installed on the output end, and the mounting bracket is installed on the output end or on the liner.

[0013] This invention also relates to a method for assembling shield tunnel segments with a corner waterproof sealing gasket limiting function, the method comprising:

[0014] The shield tunnel segments in the segment ring are assembled sequentially. During the assembly of each shield tunnel segment, a sealing gasket limiting device is used to prevent the longitudinal seam seal of at least one side of the shield tunnel segment from being squeezed out of the longitudinal seam of the segment.

[0015] As one embodiment, the method further includes: calculating the extrusion force F borne by the longitudinal seam seal of the target segment before the target segment is assembled; and ensuring that the limiting force provided by the sealing gasket limiting device is not less than the extrusion force F during the assembly of the target segment.

[0016] As one implementation method, the method for calculating the extrusion force F includes:

[0017] Calculate the contact pressure N1 between the longitudinal seam seal of the target segment and the longitudinal seam seal of the pre-assembled segment;

[0018] Based on the friction coefficient f1 between the longitudinal seam seal and the installation groove, calculate the anti-slip resistance F1 = N1 * f1 * L;

[0019] Based on the friction coefficient f2 between the contact surfaces of the two sets of longitudinal seam seals, calculate the sliding force F2 = N1 * f2 * L;

[0020] The extrusion force F is calculated using the formula F=F1-F2;

[0021] Where L is the contact length between the two sets of longitudinal seam seals.

[0022] The present invention also relates to a tunnel boring machine segment propulsion system, comprising multiple sets of jacks, at least some of which are tunnel boring machine jacks as described above.

[0023] The present invention has at least the following beneficial effects:

[0024] In this invention, by integrating a sealing gasket limiting device onto the jack, the longitudinal joint sealant is actively and physically prevented from being squeezed out of the longitudinal joint of the tunnel segments during segment assembly. This ensures the integrity and reliability of the waterproof seal line of the longitudinal joint of the tunnel segments, significantly reducing the risk of leakage in the shield tunnel. As an accessory component of the jack, the sealing gasket limiting device moves synchronously with the jack body, requiring no additional independent operation process and seamlessly integrating with existing assembly techniques, thus ensuring construction efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of shield tunnel segment assembly;

[0027] Figure 2 This is a schematic diagram of the extrusion of a longitudinal seam seal.

[0028] Figure 3 This is a schematic diagram of the structure of the tunnel boring machine jack provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram illustrating the application of the sealing gasket limiting device.

[0030] Figure 5 A schematic diagram showing the contact pressure N1 between the longitudinal seam seal of the target segment and the longitudinal seam seal of the pre-assembled segment;

[0031] Figure 6 A schematic diagram of the extrusion force F borne by the longitudinal seam seal;

[0032] Figure 7 This is a schematic diagram of the segment propulsion system. Detailed Implementation

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] like Figure 3 and Figure 4 This invention provides a tunnel boring machine jack 300, including a jack body 301 and a sealing gasket limiting device 302. The sealing gasket limiting device 302 includes a mounting frame 3021 installed on the execution end of the jack body 301 and a pressure block 3022 disposed on the mounting frame 3021. The pressure block 3022 is configured to prevent the longitudinal seam seal 100 at at least one side of the target tunnel segment 200 from being squeezed out of the longitudinal seam of the tunnel segment when the jack body 301 pushes the target tunnel segment 200.

[0036] In this embodiment, by integrating a sealing gasket limiting device 302 onto the jack 300, the longitudinal joint seal 100 is actively and physically prevented from being squeezed out of the longitudinal joint of the tunnel segment during the segment assembly process. This ensures the integrity and reliability of the waterproof sealing line of the longitudinal joint of the tunnel segment and significantly reduces the risk of leakage in the shield tunnel. As an auxiliary component of the jack 300, the sealing gasket limiting device 302 moves synchronously with the jack body 301, requiring no additional independent operation procedures and seamlessly integrating with existing assembly processes, thus ensuring construction efficiency.

[0037] The aforementioned mounting bracket 3021 includes, but is not limited to, a rod-like form. The mounting bracket 3021 extends laterally toward the jack body 301 to install the pressure block 3022 in a suitable position to ensure the restriction of the longitudinal seam seal 100.

[0038] The mounting bracket 3021 and pressure block 3022 mentioned above can be made of materials such as steel and polyamide.

[0039] In one embodiment, such as Figure 3 The pressing surface of the aforementioned pressure block 3022 is a plane; furthermore, the pressing surface is perpendicular to the axis of the jack body 301.

[0040] Preferably, the actuating end of the jack body 301 includes an output end of the jack body 301 and a liner 3011 installed on the output end. The mounting bracket 3021 is installed on the output end or on the liner 3011. Preferably, the mounting bracket 3021 is detachably installed on the jack body 301 for easy installation and maintenance.

[0041] Preferably, the longitudinal seam seal 100 is restricted by using a pressure block 3022 to press against it. Accordingly, the position of the pressure block 3022 satisfies the following condition: when the jack body 301 pushes the target segment 200, the pressing surface of the pressure block 3022 faces and abuts against the corner section of the longitudinal seam seal 100 on the corresponding side of the target segment 200.

[0042] Among them, the corner section of the longitudinal seam seal 100 refers to the seal section at the corner of the pipe segment edge. The cross-sectional direction of this corner section changes, and the stress is most concentrated, making it most prone to warping and detachment.

[0043] Taking the pressure block 3022 restricting the longitudinal seam seal 100 on one side of the target segment 200 as an example, when the jack body 301 pushes the target segment 200, the pressure block 3022 is directly opposite the longitudinal seam seal 100 on the corresponding side of the target segment 200, and also directly opposite the longitudinal seam of the segment on the corresponding side. Accordingly, as... Figure 7 The distance between the pressure block 3022 and the center of the shield tunnel is equal to the center radius of the longitudinal joint seal 100 (that is, the distance between the longitudinal joint seal 100 and the center of the shield tunnel).

[0044] The position of the pressure block 3022 can be set according to the control standard to limit the extrusion amount of the longitudinal seam seal 100 within a set range. When the pressure block 3022 abuts against the longitudinal seam seal 100 on the corresponding side of the target segment 200, the longitudinal seam seal 100 is controlled in its initial installation position. The pressure block 3022 abuts against the corner section of the longitudinal seam seal 100, generally so that the pressure block 3022 abuts against the longitudinal seam seal 100 on the longitudinal end of the target segment 200. That is, the pressing surface of the pressure block 3022 abuts against the longitudinal end of the target segment 200, and more preferably, it is partially located outside the target segment 200. When the target segment 200 is pushed into place, the pressure block 3022 abuts against the longitudinal ends of the segment on both sides of the longitudinal seam, thus further ensuring the anti-extrusion effect on the longitudinal seam seal 100. Therefore, the width and height of the pressure block 3022 should be greater than the cross-sectional area of ​​the longitudinal joint seal 100, and more preferably, a construction error space of not less than 15mm should be reserved.

[0045] In this embodiment, the pressure block 3022 only restricts the longitudinal seam seal 100 on one side of the target segment 200; obviously, two pressure blocks 3022 can also be integrated on the jack body 301 to restrict the longitudinal seam seals 100 on both sides of the target segment 200 respectively.

[0046] Furthermore, the sealing gasket limiting device 302 also includes a first adjusting mechanism for adjusting the distance between the pressure block 3022 and the output end of the jack body 301 in the axial direction of the jack. This allows for adjusting the distance between the pressure block 3022 and the longitudinal seam seal 100. It can precisely control the pressure block 3022 and the longitudinal seam seal 100 to maintain a small pre-pressure gap according to the control standard, or apply a certain pre-tightening force when the pressure block 3022 and the longitudinal seam seal 100 are in contact. Therefore, it can effectively improve the reliability and flexibility of the restriction on the longitudinal seam seal 100.

[0047] In one embodiment, such as Figure 3 The first adjusting mechanism includes an adjusting screw 3023, the axis of which is parallel to the axial direction of the jack. The adjusting screw 3023 is threadedly connected to the mounting bracket 3021, and the pressure block 3022 is mounted on the adjusting screw 3023. Rotating the adjusting screw 3023 drives the pressure block 3022 to move precisely along the axial direction of the jack, achieving millimeter-level stroke adjustment.

[0048] Furthermore, the sealing gasket limiting device 302 also includes a second adjustment mechanism for adjusting the distance between the pressure block 3022 and the jack axis in the radial direction. This second adjustment mechanism allows for precise control of the pressure block 3022's position on the tunnel segment ring, ensuring that the pressure block 3022 is aligned with the corresponding longitudinal seam seal 100 / tunnel segment longitudinal seam, thus enabling the jack 300 to be used for advancing tunnel segments of different specifications. This second adjustment mechanism may include, but is not limited to, designing the mounting frame 3021 as a telescopic rod; or providing multiple mounting positions on the mounting frame 3021, with the pressure block 3022 selectively mounted on one of these positions using bolts or other detachable mounting components.

[0049] Based on the first and / or second adjustment mechanisms described above, the jack 300 can be adapted to different pipe segment and sealing component designs, and has good versatility.

[0050] Example 2

[0051] This invention provides a method for assembling tunnel segments, the method comprising:

[0052] The shield tunnel segments in the segment ring are assembled in sequence. During the assembly of each shield tunnel segment, a sealing gasket limiting device 302 is used to prevent the longitudinal seam seal 100 on at least one side of the shield tunnel segment from being squeezed out of the longitudinal seam of the segment.

[0053] The sealing gasket limiting device 302 can refer to the relevant content in Embodiment 1 above. Alternatively, the assembly method in this embodiment can be implemented based on the tunnel boring machine jack 300 provided in Embodiment 1 above.

[0054] Preferably, the method further includes: calculating the extrusion force F borne by the longitudinal seam seal 100 of the target segment 200 before the target segment 200 is assembled; and ensuring that the limiting force provided by the sealing gasket limiting device 302 is not less than the extrusion force F during the assembly of the target segment 200, which further ensures that the sealing gasket limiting device 302 can reliably limit and constrain the longitudinal seam seal 100.

[0055] In one embodiment, the method for calculating the extrusion force F includes:

[0056] (1) such as Figure 5 Calculate the contact pressure N1 between the longitudinal seam seal 100 of the target segment 200 and the longitudinal seam seal 100 of the pre-assembled segment; including but not limited to calculating N1 using numerical simulation (such as the finite element method) or based on elasticity formulas.

[0057] (2) such as Figure 6 Based on the friction coefficient f1 between the longitudinal seam seal 100 and the installation groove, the anti-slip resistance F1 = N1 * f1 * L is calculated. This is the friction force between the bottom of the longitudinal seam seal 100 and the installation groove, which is a favorable factor in preventing the longitudinal seam seal 100 from moving.

[0058] Based on the friction coefficient f2 between the contact surfaces of the two sets of longitudinal seam seals 100, the sliding force F2 = N1 * f2 * L is calculated. This is the friction force between the contact surfaces of the seals, which is an unfavorable factor that drives the longitudinal seam seal 100 to slide out of the installation groove.

[0059] Where L is the contact length between the two sets of longitudinal seam seals 100.

[0060] The friction coefficients f1 and f2 can be obtained through material testing.

[0061] (3) The extrusion force F is calculated according to the formula F=F1-F2.

[0062] Typically, F2 is much larger than F1, and the sliding force F2 is dominant. Therefore, the calculated result of the extrusion force F is negative, and its absolute value is the magnitude of the force that needs to be overcome by the sealing gasket limiting device 302.

[0063] Based on the above scheme, the design of the sealing gasket limiting device 302 (such as the required limiting force, the size of the pressure block 3022, etc.) is based on a reliable basis, realizing refined design and construction.

[0064] Example 3

[0065] This invention provides a tunnel boring machine segment propulsion system, including multiple sets of jacks 300, at least some of which are the tunnel boring machine jacks 300 provided in Embodiment 1 above.

[0066] Preferably, in the assembly area corresponding to each longitudinal joint of the tunnel segment, the corresponding jack 300 is equipped with a sealing gasket limiting device 302, thereby forming a continuous and uniform sealing protection system throughout the entire circumference. Figure 7 Each set of jacks 300 is equipped with a sealing gasket limiting device 302 (i.e., a pressure block 3022), which can realize the anti-extrusion control of the longitudinal seam seal 100 for each segment.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tunnel boring machine jack with a segment corner waterproof sealing gasket limiting function, comprising a jack body, characterized in that, It also includes a sealing gasket limiting device, which includes a mounting bracket installed on the execution end of the jack body and a pressure block disposed on the mounting bracket. The pressure block is configured to prevent the longitudinal seam seal of at least one side of the target segment from being squeezed out of the longitudinal seam of the segment when the jack body pushes the target segment.

2. The tunnel boring machine jack as described in claim 1, characterized in that, The position of the pressure block satisfies the following condition: when the jack body pushes the target segment, the pressing surface of the pressure block is directly opposite to and abuts against the corner section of the longitudinal seam seal on the corresponding side of the target segment.

3. The tunnel boring machine jack as described in claim 1 or 2, characterized in that: The sealing gasket limiting device also includes a first adjustment mechanism for adjusting the distance between the pressure block and the output end of the jack body in the axial direction of the jack.

4. The tunnel boring machine jack as described in claim 3, characterized in that: The first adjustment mechanism includes an adjustment screw, the axis of which is parallel to the axial direction of the jack, the adjustment screw is threadedly connected to the mounting bracket, and the pressure block is mounted on the adjustment screw.

5. The tunnel boring machine jack as described in claim 1 or 2, characterized in that: The sealing gasket limiting device also includes a second adjustment mechanism for adjusting the distance between the pressure block and the axis of the jack in the radial direction.

6. The tunnel boring machine jack as described in claim 1, characterized in that: The actuator of the jack body includes the output end of the jack body and a liner installed on the output end. The mounting bracket is installed on the output end or on the liner.

7. A method for assembling shield tunnel segments with corner waterproof sealing gaskets for limiting positioning, characterized in that, The method includes: The shield tunnel segments in the segment ring are assembled sequentially. During the assembly of each shield tunnel segment, a sealing gasket limiting device is used to prevent the longitudinal seam seal of at least one side of the shield tunnel segment from being squeezed out of the longitudinal seam of the segment.

8. The shield tunnel segment assembly method as described in claim 7, characterized in that, The method further includes: calculating the extrusion force F borne by the longitudinal seam seal of the target segment before the target segment is assembled; and ensuring that the limiting force provided by the sealing gasket limiting device is not less than the extrusion force F during the assembly of the target segment.

9. The shield tunnel segment assembly method as described in claim 8, characterized in that, The method for calculating the extrusion force F includes: Calculate the contact pressure N1 between the longitudinal seam seal of the target segment and the longitudinal seam seal of the pre-assembled segment; Based on the friction coefficient f1 between the longitudinal seam seal and the installation groove, calculate the anti-slip resistance F1 = N1 * f1 * L; Based on the friction coefficient f2 between the contact surfaces of the two sets of longitudinal seam seals, calculate the sliding force F2 = N1 * f2 * L; The extrusion force F is calculated using the formula F=F1-F2; Where L is the contact length between the two sets of longitudinal seam seals.

10. A segment propulsion system for a tunnel boring machine, comprising multiple sets of jacks, characterized in that: At least some of the jacks are shield machine jacks as described in any one of claims 1 to 6.

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