A shield tunnel segment structure and a sealing groove parameter design method

Abstract

The application discloses a kind of shield tunnel segment structure and sealing groove parameter design method, it is related to shield tunnel waterproof technical field, the structure includes: segment main body, and the contact surface of adjacent segment main body connection is equipped with two inner side sealing pad grooves and outer side sealing pad grooves being spaced in thickness direction, the inner side sealing pad groove and outer side sealing pad groove are all used to set waterproof sealing pad, wherein, the inner side sealing pad groove position is located according to the relationship between inner side sealing pad groove length, inner side sealing pad groove position, segment joint maximum stress and stress zero point position resistance moment, when the inner side sealing pad groove position of stress zero point position resistance moment maximum is selected.The problems that two sealing pads are adjacent in the prior art, and the bending performance of tunnel segment joint is weak are solved.

Description

Technical Field

[0001] This invention relates to the field of waterproofing technology for shield tunnels, specifically to a design method for shield tunnel segment structure and sealing groove parameters. Background Technology

[0002] A shield tunnel is a tunnel constructed using a tunnel boring machine (TBM) to excavate and remove excavated material while simultaneously controlling the excavation face and surrounding soil to prevent collapse and instability. Inside the TBM, segments are assembled to form the tunnel lining, and grouting is performed behind the walls, all without disturbing the surrounding soil. The "shield" of a TBM refers to the cutterhead, pressure chamber, and steel shell that maintains the stability of the excavation face, while the "structure" refers to the tunnel segments that form the tunnel lining and the grouting material behind the walls.

[0003] In the waterproofing design of large-diameter underwater shield tunnels, due to the high water pressure, it is crucial to control the leakage of groundwater into the tunnel. Current technology typically involves installing two consecutive waterproof seals at the tunnel segment joints. However, the adjacent placement of these seals weakens the bending resistance of the tunnel segment joints. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a design method for shield tunnel segment structure and sealing groove parameters. This method solves the problem that existing technologies use two consecutive waterproof sealing gaskets at the tunnel segment joints for waterproofing, but the adjacent placement of the two sealing gaskets weakens the positive bending resistance of the tunnel segment joints.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] On the one hand, this solution provides a shield tunnel segment structure, including:

[0007] The main body of the segment has two inner sealing gasket grooves and outer sealing gasket grooves spaced apart along the thickness direction on the contact surface where it connects with the adjacent main body of the segment. Both the inner and outer sealing gasket grooves are used to set waterproof sealing gaskets. The position of the inner sealing gasket groove is selected as the preferred position of the inner sealing gasket groove (2) based on the relationship between the length of the inner sealing gasket groove (2), the position of the inner sealing gasket groove (2), the maximum stress of the segment joint and the stress zero point position resistance moment.

[0008] In some alternative solutions, the contact surface between the segment body and the adjacent segment body is provided with bolt holes for connecting with the adjacent segment body.

[0009] In some alternative solutions, when selecting the location of the inner sealing gasket groove (2), the inner sealing gasket groove (2) must be located on the side of the bolt hole (4) away from the tunnel.

[0010] In some alternative solutions, the outer sealing gasket groove is located at a predetermined length away from the tunnel end in the thickness direction of the segment body.

[0011] In some alternative solutions, the groove depth of the outer sealing gasket groove is greater than the groove depth of the inner sealing gasket groove.

[0012] In some alternative solutions, an inner sealing gasket is provided in the inner sealing gasket groove, and the inner sealing gasket is a water-swellable waterproof rubber component.

[0013] In some alternative solutions, an outer sealing gasket is provided in the outer sealing gasket groove, and the outer sealing gasket is made of EPDM rubber.

[0014] On the other hand, this solution provides a method for designing the parameters of the shield tunnel segment sealing groove, which is used for the parameters of the shield tunnel segment structure described in any of the above-mentioned claims, and includes the following steps:

[0015] Based on the stress distribution of the contact stress of the segment joint, the relationship between the length of the inner sealing gasket groove, the position of the inner sealing gasket groove, the maximum stress of the segment joint, and the section modulus at the stress zero point is established.

[0016] Based on the relationship between the length of the inner sealing gasket groove, the position of the inner sealing gasket groove, the maximum stress of the segment joint and the section modulus at the stress zero point, the position of the inner sealing gasket groove that maximizes the section modulus at the stress zero point of the segment joint is selected as the preferred position of the inner sealing gasket groove.

[0017] In some alternative solutions, according to the formula:

[0018] Determine the section modulus at the location of the zero point of contact stress at the segment joint;

[0019] Where M2 is the section modulus at the zero point of contact stress of the segment joint, h1 is the distance from the inner sealing gasket groove to the zero point of contact stress of the segment joint, h2 is the distance from the inner sealing gasket groove to the outer sealing gasket groove, L is the length of the inner sealing gasket groove, and f is the maximum stress of the segment joint.

[0020] In some alternative solutions, the distance between the inner sealing gasket groove and the bolt hole is greater than or equal to the set distance.

[0021] Compared with the prior art, the advantages of this invention are as follows: This solution provides two inner and outer sealing gasket grooves spaced apart along the thickness direction at the contact surface connecting the main body of the tunnel segment and the adjacent main body of the tunnel segment. The position of the inner sealing gasket groove is selected based on the relationship between the length of the inner sealing gasket groove, its position, the maximum stress at the joint of the tunnel segment, and the modulus of the stress zero point, to maximize the modulus of the stress zero point. This results in a greater positive bending resistance at the tunnel segment joint compared to the prior art where two sealing gasket grooves are continuously placed at the outer sealing gasket groove. It also solves the problem in the prior art where two waterproof sealing gaskets are continuously placed at the tunnel segment joint for waterproofing, but the adjacent placement of the two sealing gaskets weakens the positive bending resistance of the tunnel segment joint. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a shield tunnel segment connected to an adjacent shield tunnel segment in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of a shield tunnel segment not connected to an adjacent shield tunnel segment in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram showing the distribution of contact stress at the segment joints in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram showing the distribution of contact stress at the segment joint when the inner sealing gasket groove and the outer sealing gasket groove are adjacent in an embodiment of the present invention.

[0027] Figure 5 This is a flowchart illustrating the design method for the sealing groove parameters of shield tunnel segments in an embodiment of the present invention.

[0028] In the diagram: 1. Main body of the segment; 2. Inner sealing gasket groove; 3. Outer sealing gasket groove; 4. Bolt hole. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] like Figure 1 and Figure 2 As shown, in one aspect, the present invention provides a shield tunnel segment structure, comprising:

[0032] The main body of the segment 1 has two inner sealing gasket grooves 2 and outer sealing gasket grooves 3 that are spaced apart along the thickness direction on the contact surface where it connects with the adjacent main body of the segment 1. Both the inner sealing gasket groove 2 and the outer sealing gasket groove 3 are used to set waterproof sealing gaskets. The position of the inner sealing gasket groove 2 is selected as the preferred position of the inner sealing gasket groove 2 based on the relationship between the length of the inner sealing gasket groove (2), the position of the inner sealing gasket groove (2), the maximum stress of the segment joint and the stress zero point position resistance moment.

[0033] In this embodiment, the present invention provides two inner sealing gasket grooves 2 and outer sealing gasket grooves 3 spaced apart along the thickness direction at the contact surface connecting the main body 1 of the tunnel segment 1 and the adjacent main body 1 of the tunnel segment 1. The position of the inner sealing gasket groove 2 is selected based on the relationship between the length of the inner sealing gasket groove 2, the position of the inner sealing gasket groove 2, the maximum stress of the tunnel segment joint, and the modulus of the stress zero point, so that the position of the inner sealing gasket groove 2 that maximizes the modulus of the stress zero point is maximized. Compared with the prior art in which two sealing gasket grooves are continuously set at the outer sealing gasket groove, the tunnel segment joint of the shield tunnel has a greater positive bending resistance. This solves the problem in the prior art that two waterproof sealing gaskets are continuously set at the tunnel segment joint for waterproofing, but the adjacent positions of the two sealing gaskets weaken the positive bending resistance of the tunnel segment joint.

[0034] In this embodiment, the inner and outer sides of the inner sealing gasket groove 2 and the outer sealing gasket groove 3 are relative to the thickness direction of the tunnel segment. The inner sealing gasket groove 2 is located closer to one side of the tunnel than the outer sealing gasket groove 3.

[0035] In some optional embodiments, the contact surface where the segment body 1 connects with the adjacent segment body 1 is provided with bolt holes 4 for connecting with the adjacent segment body 1.

[0036] In this embodiment, the main body 1 of the segment is bolted to the adjacent main body 1 through bolt holes 4.

[0037] In some alternative embodiments, when selecting the location of the inner sealing gasket groove (2), the inner sealing gasket groove (2) must be located on the side of the bolt hole (4) away from the tunnel.

[0038] In this embodiment, the inner sealing gasket groove (2) is set on the side of the bolt hole (4) away from the tunnel to prevent water from entering the tunnel along the bolt hole 4 after the outer sealing gasket groove fails and leaks.

[0039] In some alternative embodiments, the outer sealing gasket groove 3 is located at a predetermined length away from the end of the tunnel in the thickness direction of the segment body 1.

[0040] In this embodiment, the outer sealing gasket groove 3 is located at a predetermined length away from the end of the tunnel in the thickness direction of the segment body 1. The location of the outer sealing gasket groove 3 is first determined based on the dimensions of the segment body 1.

[0041] In some alternative embodiments, the groove depth of the outer sealing gasket groove 3 is greater than the groove depth of the inner sealing gasket groove 2.

[0042] In this embodiment, the groove depth of the outer sealing gasket groove 3 is greater than the groove depth of the inner sealing gasket groove 2. This reduces the impact of the outer gap on the inner gap when the tunnel segment joint opens. The inner gap opens less, allowing the inner sealing gasket to still maintain good waterproof performance.

[0043] In some optional embodiments, an inner sealing gasket is provided in the inner sealing gasket groove 2, and the inner sealing gasket is a water-swellable waterproof rubber component.

[0044] In some optional embodiments, an outer sealing gasket is provided in the outer sealing gasket groove 3, and the outer sealing gasket is made of EPDM rubber.

[0045] In this embodiment, the thickness of the sealing gasket is greater than the depth of the sealing gasket groove to ensure a complete seal.

[0046] In this embodiment, during the assembly of the tunnel segment body 1, bolts are inserted through bolt holes and pass through bolt holes of adjacent tunnel segment bodies 1 to assemble the two tunnel segment bodies 1 together. Under the combined action of tunnel assembly pressure, jack pressure, bolt pre-tightening force, and subsequent water and soil pressure, the inner and outer sealing gaskets are in a state of high contact stress, achieving a waterproof effect.

[0047] like Figure 3 , Figure 4 and Figure 5As shown, on the other hand, the present invention provides a method for designing the parameters of the shield tunnel segment sealing groove, which is used to design the parameters of the shield tunnel segment structure according to any of the above-mentioned methods, and includes the following steps:

[0048] S1: Based on the stress distribution of the contact stress of the segment joint, establish the relationship between the length of the inner sealing gasket groove, the position of the inner sealing gasket groove, the maximum stress of the segment joint, and the section modulus at the stress zero point.

[0049] S2: Based on the relationship between the length of the inner sealing gasket groove, the position of the inner sealing gasket groove, the maximum stress of the segment joint and the stress zero point position modulus, the position of the inner sealing gasket groove that maximizes the stress zero point position modulus of the segment joint contact surface is selected as the preferred position of the inner sealing gasket groove.

[0050] In this embodiment, the location of the stress zero point at the segment joint is affected by factors such as the segment structure and tunnel pressure. When selecting the preferred location of the inner sealing gasket groove, the stress zero point location closest to the tunnel location is selected as the analysis object among the possible stress zero point locations of the segment joint. The preferred inner sealing gasket groove location selected by using the stress zero point location closest to the tunnel location as the analysis object still has the maximum resisting moment when the stress zero point is in other locations.

[0051] In some alternative embodiments, according to the formula:

[0052] Determine the section modulus at the location of the zero point of contact stress at the segment joint;

[0053] Where M2 is the section modulus at the zero point of contact stress of the segment joint, h1 is the distance from the inner sealing gasket groove to the zero point of contact stress of the segment joint, h2 is the distance from the inner sealing gasket groove to the outer sealing gasket groove, L is the length of the inner sealing gasket groove, and f is the maximum stress of the segment joint.

[0054] In this embodiment, the stress distribution at the segment joint is considered triangular during calculation, meaning the stress increases linearly from the zero stress point to the outer sealing gasket. The contact stress of the inner sealing gasket is ignored in the calculation compared to the compressive stress of the concrete structure. The lengths of h1 and h2 change depending on the position of the inner sealing gasket groove, but the value of h1 + h2 remains constant. When the inner sealing gasket groove is adjacent to the outer sealing gasket groove, i.e., h2 = 0, the section modulus at the zero contact stress point of the segment joint is: Where M1 is the section moment at the zero-stress point of the segment joint when the inner and outer sealing gasket grooves are adjacent. Since the value of h1+h2 is fixed, the value of M1 is also fixed. It can be concluded that the smaller h1 is, The larger the value, the greater the modulus M2 at the zero-stress point of the tunnel segment joint. Therefore, the inner sealing groove is preferably located at the zero-stress point of the tunnel segment joint. At this point, the tunnel segment joint exhibits the strongest positive bending resistance. Furthermore, it can be seen that when the inner sealing groove is located closer to the tunnel than the zero-stress point, the modulus at the zero-stress point remains at its maximum value. Therefore, the inner sealing groove is preferably located between the zero-stress point of the tunnel segment joint and the tunnel end closest to the tunnel. Specifically, the location of the inner sealing groove must meet construction requirements, such as the minimum distance between the inner sealing groove and the tunnel end closest to the tunnel, and the minimum distance between the inner sealing groove and the bolt holes.

[0055] In some optional embodiments, the distance between the inner sealing gasket groove and the bolt hole is greater than or equal to a set distance.

[0056] In this embodiment, since bolt holes are provided on the contact surfaces between the main body of the pipe segment and the adjacent main body of the pipe segment, in order to ensure that both the bolt holes and the inner sealing gasket groove can function effectively and meet the construction requirements, the distance between the position of the inner sealing gasket groove and the bolt holes must be greater than or equal to the set distance.

[0057] In summary, the shield tunnel segment structure and shield tunnel segment sealing groove parameter design method provided by this invention avoid the problem that when the outer joint opens, the misalignment is large, and the outer sealing gasket fails, water can easily seep into the tunnel along the bolt holes, affecting the normal use of the tunnel. It effectively improves the positive bending stiffness and overall waterproofing capacity of the tunnel segment joints. Even when the outer sealing gasket fails and leaks, the inner sealing gasket still has good waterproofing performance, and water will not enter the tunnel along the bolt holes, improving the durability of the bolts. The increased stress area of ​​the concrete structure outside the segment joint significantly improves the positive bending stiffness of the joint.

[0058] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] It should be noted that in this application, relational terms such as "inner" and "outer" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A shield tunnel segment structure, characterized in that, include: The main body of the segment (1) has two inner sealing gasket grooves (2) and outer sealing gasket grooves (3) that are spaced apart along the thickness direction on the contact surface where it connects with the adjacent main body of the segment (1). The inner sealing gasket grooves (2) and outer sealing gasket grooves (3) are both used to set waterproof sealing gaskets. The inner sealing gasket groove (2) position is selected as the inner sealing gasket groove (2) position based on the relationship between the length of the inner sealing gasket groove (2), the position of the inner sealing gasket groove (2), the maximum stress of the segment joint and the stress zero point position resistance moment. The contact surface between the main body (1) of the segment and the adjacent main body (1) is provided with bolt holes (4) for connecting with the adjacent main body (1). When selecting the location of the inner sealing gasket groove (2), the inner sealing gasket groove (2) must be located on the side of the bolt hole (4) away from the tunnel.

2. The shield tunnel segment structure as described in claim 1, characterized in that, The outer sealing gasket groove (3) is located at a distance from the end of the tunnel away from the thickness direction of the segment body (1).

3. The shield tunnel segment structure as described in claim 1, characterized in that, The groove depth of the outer sealing gasket groove (3) is greater than the groove depth of the inner sealing gasket groove (2).

4. The shield tunnel segment structure as described in claim 3, characterized in that, An inner sealing gasket is provided in the inner sealing gasket groove (2), and the inner sealing gasket is a water-swellable waterproof rubber component.

5. The shield tunnel segment structure as described in claim 3, characterized in that, An outer sealing gasket is provided in the outer sealing gasket groove (3), and the outer sealing gasket is made of EPDM rubber.

6. A method for designing parameters of a shield tunnel segment sealing groove, characterized in that, Its use in designing shield tunnel segment structures as described in any one of claims 1-5 includes the following steps: Based on the stress distribution of the contact stress of the segment joint, the relationship between the length of the inner sealing gasket groove, the position of the inner sealing gasket groove, the maximum stress of the segment joint, and the section modulus at the stress zero point is established. Based on the relationship between the length of the inner sealing gasket groove, the position of the inner sealing gasket groove, the maximum stress of the segment joint and the section modulus at the stress zero point, the position of the inner sealing gasket groove that maximizes the section modulus at the stress zero point of the segment joint is selected as the position of the inner sealing gasket groove.

7. The method for designing the sealing groove parameters of a shield tunnel segment as described in claim 6, characterized in that, According to the formula: Determine the section modulus at the zero point of contact stress at the segment joint; in, The section modulus at the zero-point location of the contact stress at the segment joint. This is the distance from the inner sealing gasket groove to the point of zero contact stress at the segment joint. This is the distance from the inner sealing gasket groove to the outer sealing gasket groove. The length of the inner sealing gasket groove. This represents the maximum stress at the segment joint.

8. The method for designing the sealing groove parameters of a shield tunnel segment as described in claim 7, characterized in that, There is a certain distance between the inner sealing gasket groove and the bolt hole.

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