Shield tunnel segment corner sealing gasket anti-extrusion structure and design method

Abstract

This invention discloses a structure and design method for preventing the corner sealing gasket of a shield tunnel segment from slipping out. The structure includes a segment body, at least one anti-slip patch, and a sealing gasket. The segment body is used for forward assembly and includes four assembly end faces. A sealing ring groove is formed on the four assembly end faces. The four assembly end faces include a rear assembly end face and at least one active sliding end face located on the left and right sides. The sealing ring groove includes a first corner groove segment formed at the junction of the active sliding end face and the rear assembly end face. The at least one anti-slip patch is adhered to the groove sidewall of the corresponding first corner groove segment. The sealing gasket is ring-mounted in the sealing ring groove and abuts against the anti-slip patch. This invention solves the problem of sealing ring slippage leading to sealing failure in existing shield tunnel segment assembly structures.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel segment structure technology, and in particular to the anti-detachment structure and design method of the corner sealing gasket for shield tunnel segments. Background Technology

[0002] Currently, all shield tunnel excavation processes require the simultaneous assembly of shield tunnel segment splicing structures to form stable support for the shield tunnel. This process involves assembling segments ring by ring along the tunnel's extension direction, with multiple segments within each ring needing to be interlocked one by one. Therefore, in two adjacent segments, one is spliced ​​first, and the other is then interlocked based on that. To ensure a sealing effect, each segment has a groove with a sealing ring inside. During the splicing process, the two contacting sealing rings press against each other and slip relative to each other. This causes the sealing ring in the later-assembled segment to slip backward along the splicing direction under the action of friction, leading to sealing failure. Summary of the Invention

[0003] The main objective of this invention is to propose a structure and design method for preventing the corner sealing gaskets of shield tunnel segments from slipping out, aiming to solve the problem of sealing rings easily slipping out and causing sealing failure in existing shield tunnel segment assembly structures.

[0004] To achieve the above objectives, the shield tunnel segment corner sealing gasket anti-detachment structure proposed in this invention includes:

[0005] The segment body is used to assemble it forward into place. The segment body includes four assembly end faces. A sealing ring groove is formed on the four assembly end faces. The four assembly end faces include a rear assembly end face and at least one active sliding end face located on the left and right sides. The sealing ring groove includes a first corner groove segment formed at the junction of the active sliding end face and the rear assembly end face.

[0006] At least one anti-slip patch is affixed to the sidewall of the corresponding first corner groove segment; and,

[0007] A sealing gasket is arranged around the sealing ring groove and pressed against the anti-slip patch.

[0008] Optionally, one active sliding end face is provided, and the four assembly end faces also include a front assembly end face and a passive sliding end face. The sealing ring groove also includes a second corner groove segment formed at the junction of the front assembly end face and the passive sliding end face.

[0009] Two anti-slip patches are provided, and the two anti-slip patches are respectively attached to the sidewalls of the first corner groove section and the second corner groove section.

[0010] Optionally, the sidewall of the first corner groove segment includes a first sidewall located on the active sliding end face and a second sidewall located on the rear assembly end face;

[0011] The anti-slip patch includes a first patch segment and a second patch segment, which are respectively disposed on the first sidewall and the second sidewall.

[0012] Optionally, two anti-slip patches are provided corresponding to the two opposite sidewalls of the first corner groove segment; and / or,

[0013] A receiving groove is formed on the side wall of the first corner groove section, and the anti-slip patch is at least partially disposed in the receiving groove.

[0014] Optionally, the anti-slip patch includes a hexahedral patch, wherein the six end faces of the hexahedral patch include at least one of trapezoidal face, rectangular face and parallelogram face.

[0015] Optionally, an adhesive layer is provided between the sealing gasket and the corresponding anti-slip patch; and / or,

[0016] An adhesive layer is provided between the sealing gasket and the bottom wall of the first corner groove section; and / or,

[0017] An adhesive layer is provided between the anti-slip patch and the sidewall of the first corner groove section.

[0018] To achieve the above objectives, the present invention proposes a design method for an anti-detachment structure of corner sealing gaskets for shield tunnel segments, used in the aforementioned anti-detachment structure of corner sealing gaskets for shield tunnel segments. The sealing ring groove includes a sealing groove located at the active sliding end face. The design method for an anti-detachment structure of corner sealing gaskets for shield tunnel segments includes the following steps:

[0019] When assembling two of the tube segments, obtain the first contact pressure between the two sealing gaskets, the first coefficient of friction between the two sealing gaskets, the second coefficient of friction between the sealing gasket and the wall of the sealing groove, and the groove surface parameter information of the sealing groove.

[0020] Calculate the sliding friction force between the two sealing gaskets based on the first friction coefficient and the first contact pressure;

[0021] The second contact pressure between the sealing gasket and the bottom wall of the sealing groove, and the third contact pressure between the sealing gasket and the side wall of the sealing groove are calculated based on the first contact pressure and the groove surface parameter information.

[0022] The anti-slip resistance is calculated based on the second contact force component, the third contact force component, and the second friction coefficient.

[0023] The verification and design are based on the anti-sliding resistance and the sliding friction.

[0024] Optionally, the step of verifying and designing based on the anti-slip resistance and the sliding friction includes:

[0025] When the anti-sliding resistance is less than the sliding friction force, calculate the frictional difference between the anti-sliding resistance and the sliding friction force;

[0026] Obtain the third coefficient of friction between the anti-slip patch and the sealing gasket, and calculate the difference in friction coefficients based on the third coefficient of friction and the second coefficient of friction;

[0027] Obtain the effective area of ​​the side wall surface of the sealing groove;

[0028] The target area of ​​the anti-slip patch is calculated based on the friction force difference, the friction coefficient difference, the effective area, and the third contact force component.

[0029] Select the anti-slip patch that meets the target area and attach it to the side wall of the first corner groove section, and press the sealing gasket into the sealing ring groove so that the sealing gasket is tightly attached to the anti-slip patch.

[0030] Optionally, the step of pressing the sealing gasket into the sealing ring groove so that the sealing gasket adheres tightly to the anti-slip patch further includes:

[0031] An adhesive layer is coated on the anti-slip end face of the anti-slip patch.

[0032] Optionally, before the step of obtaining the third coefficient of friction between the anti-slip patch and the sealing gasket, and calculating the difference in friction coefficients based on the third coefficient of friction and the second coefficient of friction, the method further includes:

[0033] The surface of the sealing pad that comes into contact with the anti-slip patch is polished.

[0034] In the technical solution provided by this invention, based on the assembly direction of the segment body, the sealing gasket at the first corner groove is most prone to slippage and detachment. Therefore, attaching the anti-slip patch to the sidewall of the first corner groove changes the coefficient of friction between the sealing gasket and the groove wall of the sealing ring groove corresponding to the active sliding end face, thereby increasing the maximum static friction between the sealing gasket and the first corner groove. Furthermore, since the sealing gasket has a certain thickness, it exerts active pressure on the sealing gasket in the thickness direction, further increasing the... The maximum static friction between the sealing gasket and the first corner groove section ultimately makes the maximum static friction between the sealing gasket and the sealing ring groove greater than the sliding friction force generated by the relative sliding of the two sealing gaskets. At the same time, it should be noted that the material of the sealing gasket is generally an elastic material such as rubber, which will be affected by a certain degree of deformation and elongation under stress. Since the first corner groove section is located at the rear end of the active sliding end face, the anti-slip patch can also strongly constrain the longitudinal deformation of the sealing gasket, which ultimately greatly reduces the amount of the sealing gasket coming off and ensures the sealing and waterproof performance of the sealing gasket. Attached Figure Description

[0035] 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 the structures shown in these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the cross-sectional structure of the pre-assembly of the existing shield tunnel segment splicing structure;

[0037] Figure 2 This is a schematic diagram of the cross-sectional structure of the existing post-assembled segments and the pre-assembled segments after the sealing ring has come off.

[0038] Figure 3 A schematic diagram of the anti-detachment structure for corner sealing gaskets of shield tunnel segments provided by the present invention (excluding the sealing gasket);

[0039] Figure 4 for Figure 3 A cross-sectional schematic diagram of the anti-detachment structure of the corner sealing gasket for shield tunnel segments;

[0040] Figure 5 for Figure 3 A schematic diagram of the assembly structure of adjacent pipe segments and capping pipe segments;

[0041] Figure 6 for Figure 3A schematic diagram of the assembly structure of standard tunnel segments;

[0042] Figure 7 for Figure 3 A schematic diagram of the stress analysis of the anti-detachment structure (including the sealing gasket) of the corner sealing gasket of the shield tunnel segment;

[0043] Figure 8 for Figure 6 A schematic diagram of four structural shapes of the anti-slip patch;

[0044] Figure 9 A schematic diagram illustrating the steps of the shield tunnel segment corner sealing gasket anti-detachment structure design method provided by the present invention;

[0045] Figure 10 for Figure 9 A detailed flowchart of step S50 in the process.

[0046] Explanation of icon numbers:

[0047]

[0048]

[0049] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0053] Please see Figures 1 to 2 Currently, all shield tunnel excavation processes require the simultaneous assembly of shield tunnel segment splicing structures to form stable support for the shield tunnel. This process involves assembling segments ring by ring along the tunnel's extension direction, with multiple segments within each ring needing to be interlocked one by one. Therefore, in two adjacent segments, one is assembled first, and the other is then interlocked based on that. To ensure a sealing effect, each segment has a groove with a sealing ring inside. During the splicing process, the two contacting sealing rings press against each other and slip relative to each other. This causes the sealing ring in the later-assembled segment to slip backward along the splicing direction under the action of friction, leading to sealing failure.

[0054] Therefore, the main objective of this invention is to propose a structure and design method for preventing the corner sealing gaskets of shield tunnel segments from slipping out, aiming to solve the problem of sealing rings easily slipping out and causing sealing failure in existing shield tunnel segment assembly structures. Figures 3 to 8 This is a simplified structural diagram of the anti-detachment structure for the corner sealing gasket of the shield tunnel segment provided by the present invention. Figures 9 to 10 This is a schematic diagram illustrating the design steps of the shield tunnel segment corner sealing gasket anti-detachment structure provided by the present invention.

[0055] Please see Figures 3 to 8 The shield tunnel segment corner sealing gasket anti-detachment structure 100 includes a segment body 1, at least one anti-slip patch 2, and a sealing gasket 3. The segment body 1 is used for forward assembly into place. The segment body 1 includes four assembly end faces 11, and a sealing ring groove 12 is formed on the four assembly end faces 11. The four assembly end faces 11 include a rear assembly end face 113 and at least one active sliding end face 111 located on the left and right sides. The sealing ring groove 12 includes a first corner groove segment 121 formed at the junction of the active sliding end face 111 and the rear assembly end face 113. The at least one anti-slip patch 2 is pasted on the groove sidewall of the corresponding first corner groove segment 121. The sealing gasket 3 is circumferentially disposed in the sealing ring groove 12 and abuts against the anti-slip patch 2.

[0056] In the technical solution provided by this invention, based on the assembly direction of the segment body 1, the sealing gasket 3 at the first corner groove segment 121 is most prone to slippage and detachment. Therefore, by attaching the anti-slip patch 2 to the groove sidewall of the first corner groove segment 121, on the one hand, the friction coefficient between the sealing gasket 3 and the groove wall of the sealing ring groove 12 corresponding to the active sliding end face 111 is changed, thereby increasing the maximum static friction between the sealing gasket 3 and the first corner groove segment 121. On the other hand, since the sealing gasket 3 has a certain thickness, it will generate active compression on the sealing gasket 3 in the thickness direction, thereby further increasing the... The maximum static friction between the sealing gasket 3 and the first corner groove 121 is reduced, ultimately making the maximum static friction between the sealing gasket 3 and the sealing ring groove 12 greater than the sliding friction force generated by the relative sliding of the two sealing gaskets 3. At the same time, it should be noted that the material of the sealing gasket 3 is generally an elastic material such as rubber, which will have a certain influence of deformation and elongation under stress. Since the first corner groove 121 is located at the rear end of the active sliding end face 111, the anti-slip patch 2 can also form a strong constraint on the longitudinal deformation of the sealing gasket 3, which ultimately greatly reduces the amount of the sealing gasket 3 coming off, ensuring the sealing and waterproof performance of the sealing gasket 3.

[0057] It should be noted that the material of the anti-slip patch 2 should meet the stress requirements, and should have a large elastic modulus and tensile strength. At the same time, the coefficient of friction between the anti-slip patch 2 and the groove sidewall of the first corner groove section 121 should be greater than the coefficient of friction between the sealing gasket 3 and the groove sidewall of the first corner groove section 121.

[0058] It is worth mentioning that in the prior art, the types of the tube body 1 include standard tube segments 1a and adjacent tube segments 1b. Both the standard tube segments 1a and the adjacent tube segments 1b only need to be actively slid and spliced ​​onto the previously assembled tube segments on one side. Based on this, in this embodiment, one active sliding end face 111 is provided, and the four assembly end faces 11 also include a front assembly end face 114 and a passive sliding end face 112. The sealing ring groove 12 also includes a second corner groove segment 122 formed at the junction of the front assembly end face 114 and the passive sliding end face 112. Two anti-slip patches 2 are provided, and the two anti-slip patches 2 are respectively pasted on the groove sidewalls of the first corner groove segment 121 and the second corner groove segment 122.

[0059] It is understandable that the passive sliding end face 112 is used to abut and seal with the active sliding end face 111 of the subsequently assembled segment body 1. Affected by the sliding friction force of the sealing gasket 3 of the subsequently assembled segment body 1, the sealing gasket 3 of the previously assembled segment body 1 may also extend forward or slide out. In this embodiment, in order to address this situation, the anti-slip gasket is also provided in the second corner groove section 122, which effectively solves the problem of sealing failure.

[0060] It should be noted that the specific shape of the anti-slip patch 2 varies depending on the stress requirements of different types of pipe segments 1. Generally, in order to reduce the impact of the anti-slip patch 2 on the compression deformation of the sealing gasket 3, the width of the anti-slip patch 2 is equal to the width of the sidewall of the sealing groove, the length of the anti-slip patch 2 is preferably between 50 and 100 mm, and the thickness of the anti-slip patch 2 is determined according to the required compressive stress on the side of the sealing gasket 3. Therefore, it can be understood that the thickness and length of the anti-slip patch 2 are negatively correlated.

[0061] It is worth mentioning that in the prior art, the type of the tube body 1 also includes a capping tube 1c. The capping tube 1c is arranged in a double-sided wedge shape so that it can seal against the opposite end faces of the two adjacent tube segments 1b after being inserted from back to front. Based on this, in this embodiment, two active sliding end faces 111 are provided, and the sealing ring groove 12 includes two first corner groove segments 121 formed at the junction of the two active sliding end faces 111 and the rear assembly end face 113. Two anti-slip patches 2 are provided, and the two anti-slip patches 2 are respectively pasted on the groove sidewall of the corresponding first corner groove segment 121. This arrangement can prevent the sealing gasket 3 from failing after the capping tube segment 1c is assembled.

[0062] Please see Figure 2 and Figure 6In this embodiment, the groove sidewall of the first corner groove segment 121 includes a first sidewall 1211 located at the active sliding end face 111 and a second sidewall 1212 located at the rear assembly end face 11; the anti-slip patch 2 includes a first patch segment 21 and a second patch segment 22, which are respectively disposed on the first sidewall 1211 and the second sidewall 1212. Since the first corner groove segment 121 itself has the first sidewall 1211 and the second sidewall 1212, the first patch segment 21 and the second patch segment 22 are respectively arranged and pasted in the first sidewall 1211 and the second sidewall 1212, which can make full use of the two adjacent groove sidewalls of the first corner groove segment 121, so that the sealing gasket 3 is fully pressed against the first corner groove segment 121, which greatly increases the maximum static friction force at this point, thereby preventing the sealing gasket 3 from slipping off.

[0063] The thickness of a single anti-slip patch 2 is generally relatively thick. To avoid excessive unilateral compression deformation of the sealing gasket 3 when the anti-slip patch 2 contacts the sealing gasket 3, which would affect the sealing effect, in this embodiment, two anti-slip patches 2 are provided corresponding to the two opposite groove sidewalls of the first corner groove segment 121. The two anti-slip patches 2 can evenly distribute the thickness required by a single anti-slip patch 2 across the two opposite groove sidewalls of the first corner groove segment 121, thereby ensuring that the sealing gasket 3 receives sufficient compressive force while reducing the unilateral compression deformation caused by the two anti-slip patches 2, thus ensuring the sealing effect.

[0064] To prevent relative slippage between the anti-slip patch 2 and the sidewall of the first corner groove segment 121, in this embodiment, a receiving groove is formed on the sidewall of the first corner groove segment 121, and the anti-slip patch 2 is at least partially disposed in the receiving groove. The receiving groove not only accommodates the anti-slip patch 2 but also ensures that the coefficient of friction between the anti-slip patch 2 and the sealing gasket 3 is such that the maximum static friction force is maintained, while minimizing the unilateral pressure exerted by the anti-slip patch 2 on the sealing gasket 3.

[0065] It should be noted that the two parallel technical features mentioned above, "two anti-slip patches are provided on the two opposite sidewalls of the first corner groove segment" and "a receiving groove is formed on the sidewall of the first corner groove segment, and the anti-slip patch is at least partially provided in the receiving groove", can be provided either one or both. Obviously, providing both simultaneously is more effective.

[0066] The anti-slip patch can have various shapes, including pentahedrons, hexahedrons, or other polyhedral shapes. Specifically, in this embodiment, the anti-slip patch 2 includes a hexahedral patch, and the six end faces of the hexahedral patch include at least one of trapezoidal, rectangular, and parallelogram surfaces, to adapt to the design requirements of the sealing gasket 3 and the groove sidewall of the sealing ring groove 12 of different types of pipe segments. Please refer to [link / reference] for details. Figure 8 , Figure 8 The anti-slip patch 2 is provided in four different shapes. The front of the anti-slip patch 2 is along the splicing direction of the tube sheet, and the front shape of the anti-slip patch can be trapezoidal, rectangular, parallelogram, etc. The side of the anti-slip patch 2 is along the side wall of the groove, and the side shape of the anti-slip patch 2 can be rectangular, trapezoidal, bidirectional wedge, etc.

[0067] Please see Figure 4 To further ensure that there is no relative slippage between the anti-slip patch 2 and the groove sidewall and the sealing gasket 3, in this embodiment, an adhesive layer 4 is provided between the sealing gasket 3 and the corresponding anti-slip patch 2. The adhesive layer 4 can increase the coefficient of friction and further prevent the sealing gasket 3 from slipping off the anti-slip patch 2.

[0068] In another embodiment, an adhesive layer 4 is provided between the sealing gasket 3 and the bottom wall of the first corner groove segment 121. The adhesive layer 4 can increase the coefficient of friction and further prevent the sealing gasket 3 from slipping off the bottom wall of the first corner groove segment 121.

[0069] In another embodiment, an adhesive layer 4 is provided between the anti-slip patch 2 and the groove sidewall of the first corner groove section 121. The adhesive layer 4 can increase the coefficient of friction and further prevent the anti-slip patch 2 from slipping off the groove sidewall of the first corner groove section 121.

[0070] It should be noted that the above three parallel technical features, namely "the sealing gasket 3 and the corresponding anti-slip patch 2 are provided with an adhesive layer 4", "the sealing gasket 3 and the bottom wall of the first corner groove segment 121 are provided with an adhesive layer 4", and "the anti-slip patch 2 and the side wall of the first corner groove segment 121 are provided with an adhesive layer 4", can be selected as one, two, or simultaneously. Obviously, simultaneous installation is the best.

[0071] Please see Figure 9 and Figure 10The present invention also provides a design method for a shield tunnel segment corner sealing gasket anti-detachment structure, used in the aforementioned shield tunnel segment corner sealing gasket anti-detachment structure 100, wherein the sealing ring groove 12 includes a sealing groove located at the active sliding end face 111, and the design method for the shield tunnel segment corner sealing gasket anti-detachment structure includes the following steps:

[0072] When assembling the two segment bodies 1, obtain the first contact pressure between the two sealing gaskets 3, the first coefficient of friction between the two sealing gaskets 3, the second coefficient of friction between the sealing gasket 3 and the wall of the sealing groove, and the groove surface parameter information of the sealing groove.

[0073] The sliding friction force between the two sealing gaskets 3 is calculated based on the first friction coefficient and the first contact pressure.

[0074] The second contact pressure between the sealing gasket 3 and the bottom wall of the sealing groove, and the third contact pressure between the sealing gasket 3 and the side wall of the sealing groove are calculated based on the first contact pressure and the groove surface parameter information.

[0075] The anti-slip resistance is calculated based on the second contact force component, the third contact force component, and the second friction coefficient.

[0076] The verification and design are based on the anti-sliding resistance and the sliding friction.

[0077] In the technical solution provided in this embodiment, the groove surface parameter information includes the bottom wall width, side wall width, and angle between the side wall and bottom wall of the sealing groove. Based on these parameters, force analysis can be performed to determine the relationship between the second contact pressure, the third contact component pressure, and the first contact component pressure. Then, based on the first and second friction coefficients, the anti-slip resistance and the sliding friction force can be calculated to determine whether the sealing gasket 3 will slip during the splicing process, and then subsequent targeted optimization design can be carried out.

[0078] Please see Figure 10 Specifically, in this embodiment, the step of verifying and designing based on the anti-slip resistance and the sliding friction includes:

[0079] When the anti-sliding resistance is less than the sliding friction force, calculate the frictional difference between the anti-sliding resistance and the sliding friction force;

[0080] Obtain the third coefficient of friction between the anti-slip patch 2 and the sealing gasket 3, and calculate the difference in friction coefficients based on the third coefficient of friction and the second coefficient of friction;

[0081] Obtain the effective area of ​​the side wall surface of the sealing groove;

[0082] The target area of ​​the anti-slip patch 2 is calculated based on the friction force difference, the friction coefficient difference, the effective area, and the third contact force component.

[0083] Select the anti-slip patch 2 that meets the target area and attach it to the groove sidewall of the first corner groove section 121, and press the sealing gasket 3 into the sealing ring groove 12 so that the sealing gasket 3 is tightly attached to the anti-slip patch 2.

[0084] When the anti-slip resistance is less than the sliding friction, it means that under the current conditions, the sealing gasket 3 will slip during the splicing process, and anti-slip design is required. Since the main function of the anti-slip patch 2 is to change the friction coefficient between the sealing gasket 3 and the groove sidewall of the first corner groove segment 121, so that the sealing gasket 3 can obtain a larger friction force at the anti-slip patch 2, the area ratio of the anti-slip patch 2 to the groove sidewall of the sealing groove directly affects whether the increase in the final maximum static friction force can fill the gap of the friction force difference. Therefore, the target area of ​​the anti-slip patch 2 can be deduced from the friction force difference, the friction coefficient difference, the effective area and the third contact pressure component. Then, the anti-slip patch 2 is made according to the target area, and finally the overall structure is installed.

[0085] Furthermore, in this embodiment, before the step of pressing the sealing gasket 3 into the sealing ring groove 12 so that the sealing gasket 3 adheres tightly to the anti-slip patch 2, the method further includes:

[0086] An adhesive layer 4 is coated on the anti-slip end face of the anti-slip patch 2. By coating the adhesive layer 4, the coefficient of friction between the anti-slip patch 2 and the sealing gasket 3 can be effectively increased, thereby increasing the maximum static friction and ensuring that the sealing gasket 3 will not slip off.

[0087] Furthermore, in this embodiment, before the step of obtaining the third coefficient of friction between the anti-slip patch 2 and the sealing gasket 3, and calculating the difference in friction coefficients based on the third coefficient of friction and the second coefficient of friction, the method further includes:

[0088] The surface of the sealing gasket 3 that contacts the anti-slip patch 2 is polished. It is understood that polishing the surface of the sealing gasket 3 can effectively increase the coefficient of friction between the anti-slip patch 2 and the sealing gasket 3, further preventing the sealing gasket 3 from slipping off.

[0089] Please see Figure 7Specifically, in this embodiment, the groove surface parameter information includes the groove opening width W1, the groove bottom wall width W2, the first contact pressure N2, and the second contact partial pressure N. 12 ; where N 12 =N2×W2 / W1.

[0090] More specifically, in this embodiment, the first contact pressure is N2, and the second contact partial pressure is N. 12 The third contact pressure is N. 11 The groove surface parameter information includes the angle θ between the sidewall and bottom wall of the sealing groove; where N 11 =(N2-N) 12 )cosθ.

[0091] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A structure for preventing the detachment of corner sealing gaskets for shield tunnel segments, characterized in that, include: The segment body is used to assemble it forward into place. The segment body includes four assembly end faces. A sealing ring groove is formed on the four assembly end faces. The four assembly end faces include a rear assembly end face and at least one active sliding end face located on the left and right sides. The sealing ring groove includes a first corner groove segment formed at the junction of the active sliding end face and the rear assembly end face. Two anti-slip patches are affixed to the corresponding sidewalls of the first corner groove segment; and, A sealing gasket is arranged around the sealing ring groove and abuts against the anti-slip patch; The sidewall of the first corner groove segment includes a first sidewall located on the active sliding end face and a second sidewall located on the rear assembly end face; The anti-slip patch includes a first patch segment and a second patch segment, with the first patch segment and the second patch segment respectively disposed on the first sidewall and the second sidewall; Two anti-slip patches are provided on the two opposite sidewalls of the first corner groove segment; A receiving groove is formed on the side wall of the first corner groove section, and the anti-slip patch is at least partially disposed in the receiving groove; In a cross-section perpendicular to the extension direction of the first corner groove segment, the anti-slip patch is located on two sides in the vertical direction, gradually moving away from the opening of the first corner groove segment.

2. The anti-detachment structure for corner sealing gaskets of shield tunnel segments as described in claim 1, characterized in that, One active sliding end face is provided, and the four assembly end faces also include a front assembly end face and a passive sliding end face. The sealing ring groove also includes a second corner groove segment formed at the junction of the front assembly end face and the passive sliding end face. Two anti-slip patches are provided, and the two anti-slip patches are respectively attached to the sidewalls of the first corner groove section and the second corner groove section.

3. The anti-detachment structure for corner sealing gaskets of shield tunnel segments as described in claim 1, characterized in that, The anti-slip patch includes a hexahedral patch, and the six end faces of the hexahedral patch include at least one of trapezoidal face, rectangular face and parallelogram face.

4. The anti-detachment structure for corner sealing gaskets of shield tunnel segments as described in claim 1, characterized in that, An adhesive layer is provided between the sealing gasket and the corresponding anti-slip patch; and / or, An adhesive layer is provided between the sealing gasket and the bottom wall of the first corner groove section; and / or, An adhesive layer is provided between the anti-slip patch and the sidewall of the first corner groove section.

5. A design method for a shield tunnel segment corner sealing gasket anti-detachment structure, used in the shield tunnel segment corner sealing gasket anti-detachment structure as described in any one of claims 1 to 4, wherein the sealing ring groove includes a sealing groove located at the active sliding end face, characterized in that, The design method for the anti-detachment structure of the corner sealing gasket of the shield tunnel segment includes the following steps: When assembling two of the tube segments, obtain the first contact pressure between the two sealing gaskets, the first coefficient of friction between the two sealing gaskets, the second coefficient of friction between the sealing gasket and the wall of the sealing groove, and the groove surface parameter information of the sealing groove. Calculate the sliding friction force between the two sealing gaskets based on the first friction coefficient and the first contact pressure; The second contact pressure between the sealing gasket and the bottom wall of the sealing groove, and the third contact pressure between the sealing gasket and the side wall of the sealing groove are calculated based on the first contact pressure and the groove surface parameter information. The anti-slip resistance is calculated based on the second contact force component, the third contact force component, and the second friction coefficient. The verification and design are based on the anti-sliding resistance and the sliding friction.

6. The design method for the anti-detachment structure of the corner sealing gasket of shield tunnel segments as described in claim 5, characterized in that, The steps for verification and design based on the anti-sliding resistance and the sliding friction include: When the anti-sliding resistance is less than the sliding friction force, calculate the frictional difference between the anti-sliding resistance and the sliding friction force; Obtain the third coefficient of friction between the anti-slip patch and the sealing gasket, and calculate the difference in friction coefficients based on the third coefficient of friction and the second coefficient of friction; Obtain the effective area of ​​the side wall surface of the sealing groove; The target area of ​​the anti-slip patch is calculated based on the friction force difference, the friction coefficient difference, the effective area, and the third contact force component. Select the anti-slip patch that meets the target area and attach it to the side wall of the first corner groove section, and press the sealing gasket into the sealing ring groove so that the sealing gasket is tightly attached to the anti-slip patch.

7. The design method for the anti-detachment structure of the corner sealing gasket of shield tunnel segments as described in claim 6, characterized in that, The step of pressing the sealing gasket into the sealing ring groove so that the sealing gasket adheres tightly to the anti-slip patch further includes: An adhesive layer is coated on the anti-slip end face of the anti-slip patch.

8. The design method for the anti-detachment structure of the corner sealing gasket of shield tunnel segments as described in claim 6, characterized in that, Before the step of obtaining the third coefficient of friction between the anti-slip patch and the sealing gasket, and calculating the difference in friction coefficients based on the third coefficient of friction and the second coefficient of friction, the method further includes: The surface of the sealing pad that comes into contact with the anti-slip patch is polished.

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