Design method for regulating the toughness of segment structure by using joint waterproof structure

Abstract

The present invention relates to a design method for regulating the toughness of a pipe segment structure by utilizing a joint waterproof structure. The method comprises: establishing a pipe segment structure model; calculating the initial internal force of the pipe segment structure; obtaining the maximum positive bending moment M of the pipe segment structure; 正 and the maximum negative bending moment M 负 ; If the maximum positive bending moment M 正 and the maximum negative bending moment M 负 If the difference is outside the set range, adjust the position of the center line of the core pressure zone of the segment joint by adjusting the layout of the sealing gasket to make the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within a set range. This invention changes the centerline of the core compression zone of the segment joint by changing the layout of the shield tunnel joint sealing gasket, thereby adjusting the internal force of the segment structure and enhancing the toughness of the segment structure. While ensuring the waterproofing of the segment joint, it can also save on segment structure reinforcement and improve the safety factor of the segment structure.

Description

Technical Field

[0001] The present invention relates to the technical field of shield segments, and in particular to a design method for regulating the structural toughness of a segment by utilizing a joint waterproof structure. Background Art

[0002] With the advancement of shield technology and the expansion of its application areas, shield tunnels have become characterized by large diameters, large burial depths, high water pressure, and complex geological conditions. The segmental lining structure of a shield tunnel is typically an underground prefabricated structure composed of reinforced concrete segments connected by bolts. The presence of a large number of joints significantly weakens the rigidity and integrity of the segmental lining structure. The design of segment joints is a crucial step in the design and construction of underwater shield tunnels. On the one hand, the mechanical characteristics of the joints significantly affect the mechanical characteristics of the entire tunnel, thereby affecting the overall stability and durability of the tunnel. On the other hand, to adapt to the significant challenges posed by high water pressure to the waterproof performance of shield tunnels, the waterproof design of the joints is also crucial to ensuring tunnel safety.

[0003] The joints of shield tunnel segments are discontinuous structures. Due to the presence of structures such as waterproof gasket grooves, the bearing area of ​​the concrete on the joint surface is reduced, which weakens the bending strength and bearing capacity of the joint to a certain extent, and also makes the joint exhibit obvious nonlinear characteristics. The layout of waterproof gaskets directly affects the structure of the joint surface, and thus affects the mechanical properties of the joint. As the connecting part between the segments, the mechanical properties of the joint have an important influence on the stress and deformation of the shield tunnel segment lining structure. The layout of waterproof gaskets is not just a simple waterproofing issue, but a comprehensive issue involving the mechanical properties of the entire shield tunnel lining structure. Therefore, the reasonable design and layout of waterproof gaskets are of great significance to the waterproof performance and stress performance of the shield tunnel.

[0004] Shield tunnel segment rings are assembled from multiple prefabricated reinforced concrete segments. Segment reinforcement often requires simultaneous alignment of the maximum positive and negative bending moments experienced by the ring. Properly adjusting the internal forces of the segment structure to minimize the difference between the maximum positive and negative bending moments can save reinforcement, improve the segment structure's safety factor, and enhance its robustness. Furthermore, under accidental loads, such as earthquakes, segment joints may experience reciprocating motion. Minimizing the difference between the maximum positive and negative bending moments in the segment structure can effectively prevent segment failure caused by excessive bending moments on one side, thereby improving the tunnel's seismic toughness. However, existing research has not yet reported on modulating the toughness of the segment structure by adjusting the placement of waterproof gaskets on the segment joint surface to minimize the difference between the maximum positive and negative bending moments. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure, comprising the following steps:

[0006] Establish segment structure model;

[0007] Calculate the initial internal force of the segment structure and obtain the maximum positive bending moment M of the segment structure 正 and the maximum negative bending moment M 负 ;

[0008] Determine the maximum positive bending moment M 正 and the maximum negative bending moment M 负 Whether the difference is within the set range;

[0009] If the maximum positive bending moment M 正 and the maximum negative bending moment M 负 If the difference is outside the set range, adjust the position of the center line of the core pressure zone of the segment joint by adjusting the layout of the sealing gasket to make the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within the set range.

[0010] Furthermore, the adjusting of the centerline position of the core compression zone of the segment joint includes:

[0011] If the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is outside the set range, and the maximum positive bending moment M 正 Greater than the maximum negative bending moment M 负 , then adjust the center line of the core compression zone of the segment joint to move inwards of the segment until the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within the set range.

[0012] Furthermore, if the segment joint is provided with double-track sealing gaskets, adjusting the center line of the core pressure zone of the segment joint to move toward the inside of the segment includes moving each of the sealing gaskets toward the inside of the segment or setting the double-track sealing gaskets on the same side of the center line of the joint.

[0013] Furthermore, the adjusting of the centerline position of the core compression zone of the segment joint includes:

[0014] If the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is outside the set range, and the maximum positive bending moment M 正 Less than the maximum negative bending moment M 负 , then adjust the center line of the core compression zone of the segment joint to move toward the outside of the segment until the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within the set range.

[0015] Furthermore, if the segment joint is provided with double-track sealing gaskets, adjusting the center line of the core pressure zone of the segment joint to move toward the outside of the segment includes moving each of the sealing gaskets toward the outside of the segment or setting the double-track sealing gaskets on both sides of the center line of the joint.

[0016] Furthermore, before adjusting the position of the center line of the core compression zone of the segment joint, the following steps are also included:

[0017] According to the maximum positive bending moment M 正 and the maximum negative bending moment M 负 Obtain the real-time bending stiffness of the segment joint, compare the real-time bending stiffness with the ideal bending stiffness, and adjust the position of the centerline of the core compression zone of the segment joint based on the difference between the real-time bending stiffness and the ideal bending stiffness.

[0018] Furthermore, the sealing gasket arrangement pattern includes the number of sealing gaskets and the position of sealing gaskets.

[0019] Furthermore, the sealing gasket is an EPDM rubber sealing gasket.

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1) The present invention changes the position of the centerline of the core compression zone of the segment joint by changing the layout of the shield tunnel joint sealing gasket, thereby adjusting the internal force of the segment structure and enhancing the toughness of the segment structure. While ensuring the waterproof ability of the segment joint, it can also save the segment structure reinforcement and improve the safety factor of the segment structure, providing new ideas for the design of shield tunnel segment structure.

[0022] 2) The method of adjusting the internal force of the structure of the present invention requires less adjustment to the structure of the pipe segment joint, is easy to implement, and is relatively easy to realize, while ensuring the waterproof ability of the pipe segment joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a flow chart of a design method for regulating the toughness of a segment structure provided by an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of a pipe segment joint of a single-pass sealing gasket structure provided by an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of a pipe segment joint with a double-pass sealing gasket structure provided by an embodiment of the present invention;

[0027] Figure 4 This is a diagram of a local numerical calculation model for segment joint refinement provided by an embodiment of the present invention;

[0028] Figure 5 This is a diagram of a refined numerical calculation model for a complete ring of segments provided by an embodiment of the present invention;

[0029] Figure 6 It is the MN curve of the segment structure provided in the embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. In the accompanying drawings, the sizes and relative sizes of certain parts may be exaggerated for clarity.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connection" and "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of the present invention, terms such as "up", "down", "left", "right", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0033] Furthermore, in the description of the present invention, the terms "first" and "second" are used solely to distinguish between features in the description and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features being described. Furthermore, features designated as "first" or "second" may explicitly or implicitly include one or more of the features.

[0034] The present invention provides a design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure, comprising the following steps:

[0035] Establish segment structure model;

[0036] Calculate the initial internal force of the segment structure and obtain the maximum positive bending moment M of the segment structure 正 and the maximum negative bending moment M 负 ;

[0037] Determine the maximum positive bending moment M 正 and the maximum negative bending moment M 负 Whether the difference is within the set range;

[0038] If the maximum positive bending moment M 正 and the maximum negative bending moment M 负 If the difference is outside the set range, adjust the position of the center line of the core pressure zone of the segment joint by adjusting the layout of the sealing gasket to make the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within the set range.

[0039] The joint surface of shield tunnel segments is a discontinuous structure. Along the thickness of the segments, the presence of structures such as waterproof gasket grooves reduces the bearing area of ​​the concrete at the joint surface, weakening the bending stiffness and bearing capacity of the joint to a certain extent. Gaskets are installed between adjacent segments for waterproof sealing. The layout of the gaskets directly affects the mechanical properties of the joint. The layout of the gaskets includes the number of gaskets and the location of the gaskets. The number and location of the gaskets in the segment joints have an impact on the mechanical properties of the joints. The core compression zone of the segment joint can be determined based on the gasket layout of the segment joint, and the centerline of the core compression zone of the segment joint can be determined. By adjusting the gasket layout of the segment joint, the position of the centerline of the core compression zone of the segment joint can be adjusted, thereby regulating the internal force of the segment structure and enhancing the toughness of the segment structure. The core compression zone of a segment joint refers to the area of ​​the joint surface excluding structures such as gasket grooves and caulking grooves. The height of the core compression zone is equal to the thickness of the segment joint excluding the height of structures such as gasket grooves and caulking grooves. The centerline of the core compression zone of the segment joint is the centerline of the core compression zone height. The centerline of the segment joint refers to the centerline of the segment joint thickness.

[0040] The purpose of regulating the sealing gasket arrangement type in the present application is to make the maximum positive bending moment and the maximum negative bending moment of the tube segment structure as close as possible, and the smaller the difference between the two, the better; preferably, the maximum positive bending moment and the maximum negative bending moment of the tube segment structure are equal, which is optimal, and at this time, the difference between the two is 0.

[0041] In an optimized embodiment, the method further comprises: 正 and the maximum negative bending moment M 负Obtain the flexural stiffness of the segment joint, compare it with the ideal flexural stiffness, and adjust the position of the centerline of the core compression zone of the segment joint based on the difference between the two. Bending stiffness includes positive and negative flexural stiffness. The flexural stiffness of the segment joint can be adjusted based on the layout of the sealing gaskets. The fundamental factor affecting the flexural stiffness of the segment joint is the relative position of the centerline of the core compression zone of the segment joint and the centerline of the joint. Therefore, the flexural stiffness of the segment joint can be adjusted by adjusting the layout of the sealing gaskets, thereby regulating the internal forces of the segment structure and enhancing its toughness.

[0042] As the instruction manual Figure 1 The figure shows a flow chart of the design method for regulating the toughness of the segment structure. First, the initial internal force of the segment structure is calculated based on the initial joint structure of the segment and the initial position of the center line of the core compression zone of the segment joint is determined to obtain the maximum positive bending moment M of the segment structure. 正 and the maximum negative bending moment M 负 The shield segment ring is formed by assembling multiple prefabricated reinforced concrete segments. When arranging the segment reinforcement, it is necessary to arrange the reinforcement according to both the maximum positive bending moment and the maximum negative bending moment to which the segment ring is subjected. The smaller the difference between the maximum positive bending moment and the maximum negative bending moment, the more reinforcement can be saved, the safety factor of the segment structure can be improved, and the toughness of the segment structure can be enhanced. In this embodiment, the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference between them is 0 as the set value, that is, the maximum positive bending moment M 正 and the maximum negative bending moment M 负 Equal is the optimal solution. If the maximum positive bending moment M of the segment structure is calculated 正 Equal to the maximum negative bending moment M 负 , assuming that the segment joint has an ideal bending stiffness K 正0 and K 负0 , output the number and arrangement position of the segment joint gaskets. If the maximum positive bending moment M of the segment structure is calculated 正 Greater than the maximum negative bending moment M 负 , then the positive bending stiffness K of the segment joint 正 >K 正0 , and the negative bending stiffness K 负 <K 负0 , in order to make the maximum positive bending moment M of the segment structure 正 With the maximum negative bending moment M 负 The difference between them is reduced or even equal, so the positive bending stiffness K needs to be reduced. 正 And increase the negative bending stiffness K 负 , continue to calculate the internal forces of the segment structure until the maximum positive bending moment M 正 With the maximum negative bending moment M 负 If the maximum positive bending moment M of the segment structure is calculated 正Less than the maximum negative bending moment M 负 , then the positive bending stiffness K of the segment joint 正 <K 正0 , and the negative bending stiffness K 负 >K 负0 , in order to make the maximum positive bending moment M of the segment structure 正 With the maximum negative bending moment M 负 The difference between them is reduced or even equal, so the positive bending stiffness K needs to be increased. 正 And reduce the negative bending stiffness K 负 , continue to calculate the internal forces of the segment structure until the maximum positive bending moment M 正 With the maximum negative bending moment M 负 In this embodiment, the positive bending stiffness K of the pipe segment joint can be adjusted by adjusting the arrangement of the sealing gasket. 正 and negative bending stiffness K 负 , and then allocate the internal force of the segment structure and enhance the toughness of the segment structure.

[0043] Optimize the implementation method, if the maximum positive bending moment M is calculated 正 Greater than the maximum negative bending moment M 负 , then it is necessary to reduce the positive bending stiffness K of the segment joint 正 And increase the negative bending stiffness K 负 This can be achieved by adjusting the center line of the core compression zone of the segment joint to move inwards of the segment. The positive bending stiffness K can be achieved by the above adjustment method. 正 Reduced and negative bending stiffness K 负 The increasing effect reduces the difference between the maximum positive bending moment and the maximum negative bending moment to even 0, which can adjust the internal force of the segment structure and enhance the toughness of the segment structure. In this application, the inner side of the segment refers to the back side of the segment, and the outer side of the segment refers to the front side of the segment.

[0044] As one of the specific implementation methods, as shown in the attached specification Figure 2 As shown, a single sealing gasket is provided at the joint of the pipe segments, and a joint seam is formed between adjacent pipe segments 1. A water stop groove 2 is provided on the joint surface of the pipe segment 1, and a sealing gasket 3 is provided in the water stop groove 2 for waterproof sealing. The center line of the joint is determined, and the core pressure area 4 of the pipe segment joint and its center line are determined according to the setting position of the sealing gasket 3. At this time, there is a certain distance between the center line of the core pressure area and the center line of the joint. In order to make the positive bending stiffness K 正 Reduced and negative bending stiffness K 负 Increase, move the sealing gasket 3 a certain distance inward of the segment, then the center line of the core compression zone moves inward, recalculate the internal force of the segment structure according to the adjusted segment joint structure, and compare the maximum positive bending moment and the maximum negative bending moment, repeat the above operation until the maximum positive bending moment is equal to the maximum negative bending moment.

[0045] As one of the specific implementation methods, as shown in the attached specification Figure 3 As shown, the pipe segment joint is provided with a double sealing gasket, and two water stop grooves 2 are provided on the joint surface of the pipe segment 1. The water stop groove 2 is provided with a sealing gasket 3 for waterproof sealing. The center line of the pipe segment joint is determined, and the core pressure area 4 of the pipe segment joint and its center line are determined according to the setting position of the sealing gasket 3. In order to make the positive bending stiffness K 正 Reduced and negative bending stiffness K 负 To increase the pressure, the center line of the core compression zone of the segment joint needs to be moved inward; Figure 3 The inner and outer double-pass sealing gaskets in b are moved inward as a whole, or Figure 3 The arrangement of inner and outer double-pass sealing gaskets in b is changed to Figure 3 The arrangement of the inner and outer double-pass sealing gaskets in a moves the center line of the core compression zone of the segment joint inward, achieving the positive bending stiffness K 正 Reduced and negative bending stiffness K 负 In order to increase the effect, the internal forces of the segment structure are recalculated according to the adjusted segment joint structure, and the maximum positive bending moment and the maximum negative bending moment are compared. The above operation is repeated until the maximum positive bending moment is equal to the maximum negative bending moment.

[0046] Optimize the implementation method, if the maximum positive bending moment M is calculated 正 Less than the maximum negative bending moment M 负 , then the positive bending stiffness K of the segment joint needs to be increased 正 And reduce the negative bending stiffness K 负 This can be achieved by adjusting the center line of the core compression zone of the segment joint to move toward the outside of the segment. The positive bending stiffness K can be achieved by the above adjustment method. 正 Increased and negative bending stiffness K 负 The reduction effect can reduce the difference between the maximum positive bending moment and the maximum negative bending moment to even 0, which can adjust the internal force of the segment structure and enhance the toughness of the segment structure.

[0047] As one of the specific implementation methods, as shown in the attached specification Figure 2 As shown, the segment joint is provided with a single sealing gasket to determine the midline of the joint, and the core pressure zone 4 of the segment joint and its midline are determined according to the setting position of the sealing gasket 3, so that the positive bending stiffness K 正 Increased and negative bending stiffness K 负 To reduce it, move the sealing gasket 3 a certain distance to the outside of the segment, then the center line of the core compression zone moves outward, recalculate the internal force of the segment structure according to the adjusted segment joint structure, and compare the maximum positive bending moment and the maximum negative bending moment, repeat the above operation until the maximum positive bending moment is equal to the maximum negative bending moment.

[0048] As one of the specific implementation methods, as shown in the attached specification Figure 3As shown, the segment joint is provided with double sealing gaskets to determine the midline of the segment joint, and the core pressure zone 4 of the segment joint and its midline are determined according to the setting position of the sealing gasket 3, so as to make the positive bending stiffness K 正 Increased and negative bending stiffness K 负 To reduce the pressure, the center line of the core compression zone of the segment joint needs to be moved outward; Figure 3 The outer double-pass sealing gasket in a moves toward the outer side of the segment as a whole or Figure 3 The outer double-pass sealing gasket arrangement in a is changed to Figure 3 The arrangement of the inner and outer double-pass sealing gaskets in b makes the center line of the core compression zone of the segment joint move outward, achieving the positive bending stiffness K 正 Increased and negative bending stiffness K 负 To reduce the effect, recalculate the internal force of the segment structure according to the adjusted segment joint structure, and compare the maximum positive bending moment and the maximum negative bending moment. Repeat the above operation until the maximum positive bending moment is equal to the maximum negative bending moment.

[0049] In the above process, the relative position of the center line of the core compression zone of the segment joint and the center line of the joint can be adjusted by adjusting the position of the sealing gasket, thereby adjusting the positive bending stiffness and negative bending stiffness of the segment joint, so as to reduce the difference between the maximum positive bending moment and the maximum negative bending moment of the segment structure. After multiple adjustments and calculations, the maximum positive bending moment and the maximum negative bending moment of the segment structure can be made equal. During the construction of the segment ring, reinforcement can be saved, the safety factor of the segment structure can be improved, and the toughness of the segment structure can be improved.

[0050] In an optimized implementation mode, the sealing gasket is preferably an EPDM rubber sealing gasket, which is extruded and filled between adjacent pipe segments.

[0051] In an optimized implementation method, the internal force of the segment structure can be calculated using a beam-spring model based on linear stiffness iteration of the joint or a three-dimensional refined solid model. The initial internal force of the segment structure and the internal force of the segment structure after the sealing gasket is adjusted are both calculated using the above method.

[0052] The calculation is performed using a beam-spring model with iterative nonlinear stiffness of the joint. For the joint surface structure after each adjustment of the gasket arrangement, a three-dimensional refined numerical calculation model of the segment joint is established to obtain its dual-parameter nonlinear stiffness. The nonlinear stiffness iteration algorithm of the joint is then combined with the beam-spring model to solve the internal force and deformation of the segment structure after the gasket arrangement is adjusted.

[0053] A three-dimensional refined solid model is used for calculation. For the joint surface structure after each adjustment of the sealing gasket arrangement, a three-dimensional refined numerical calculation model of the entire ring segment structure is established to directly solve the internal force and deformation of the segment structure.

[0054] The technical solution of the present invention is described in detail below by taking a double-track waterproof sealing gasket joint suitable for a large-section, high-water-pressure shield tunnel as an example.

[0055] The double-track sealing gasket includes two types: inner and outer double-track sealing gaskets and outer double-track sealing gaskets. Finite element analysis software is used to establish a refined numerical calculation model of the pipe segment joint. The influence of the two double-track sealing gasket waterproof structures on their bending mechanical properties is discussed respectively. The numerical calculation model of the pipe segment joint is shown in the appendix of the manual. Figure 4 As shown, 4a is an outer double-track sealing gasket arrangement, and 4b is an inner and outer double-track sealing gasket arrangement.

[0056] When the axial forces are 4500 kN and 12000 kN respectively, the positive bending stiffness, negative bending stiffness and the ratio of the outer double-track and inner and outer double-track segment joints are shown in Table 1.

[0057] Table 1 Bending stiffness of joints under different gasket arrangements

[0058]

[0059] It can be seen from Table 1 that when the waterproof structure of the shield tunnel segment is changed from inner and outer double tracks to outer double tracks, its positive bending stiffness decreases and its negative bending stiffness increases; when the waterproof structure of the shield tunnel segment is changed from outer double tracks to inner and outer double tracks, its positive bending stiffness increases and its negative bending stiffness decreases.

[0060] Furthermore, two kinds of double-pass sealing pad structures were used to establish the detailed numerical calculation model of the shield tunnel ring. The numerical calculation model of the whole ring segment is as shown in the attached manual. Figure 5 As shown, the concrete segments are embedded with steel cages.

[0061] According to the actual situation, different magnitudes of earth pressure are applied. The maximum positive bending moment, maximum negative bending moment and the ratio of the two to the entire ring of shield tunnel segments are shown in Table 2.

[0062] Table 2 Maximum positive and negative bending moments of the segment ring under different gasket arrangements

[0063]

[0064] As can be seen from Table 2, when the layout of waterproof sealing gaskets on the joint surface is changed from inner and outer double tracks to outer double tracks, the maximum positive bending moment and the maximum negative bending moment of the shield tunnel segment are closer. In this case, the segment reinforcement can be saved and the safety factor is improved. Figure 6 As shown, it is the MN curve diagram of the segment structure, which indicates that for the segment joints with double-track waterproof sealing gaskets, the outer double-track waterproof sealing gasket arrangement can achieve the effect of reducing the difference between the maximum positive and negative bending moments of the segment structure, thereby realizing the allocation of the internal force of the segment structure.

[0065] Those skilled in the art will appreciate that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments, and those skilled in the art can make changes and modifications within the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure, characterized in that: The following steps are involved: Establish segment structure model; Calculate the initial internal force of the segment structure and obtain the maximum positive bending moment of the segment structure and maximum negative bending moment ; Determine the maximum positive bending moment and the maximum negative bending moment Whether the difference is within the set range; If the maximum positive bending moment and the maximum negative bending moment If the difference is outside the set range, adjust the position of the center line of the core pressure zone of the segment joint by adjusting the layout of the sealing gasket to make the maximum positive bending moment and maximum negative bending moment The difference is within the set range; Before adjusting the centerline of the core compression zone of the segment joint, the following steps are also required: According to the maximum positive bending moment and maximum negative bending moment Obtain the real-time bending stiffness of the segment joint, compare the real-time bending stiffness with the ideal bending stiffness, and adjust the position of the centerline of the core compression zone of the segment joint based on the difference between the real-time bending stiffness and the ideal bending stiffness.

2. The design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure according to claim 1 is characterized in that: The adjustment of the centerline position of the core compression zone of the segment joint includes: If the maximum positive bending moment and maximum negative bending moment The difference is outside the set range, and the maximum positive bending moment Greater than the maximum negative bending moment , then adjust the center line of the core compression zone of the segment joint to move inwards of the segment until the maximum positive bending moment and maximum negative bending moment The difference is within the set range.

3. The design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure according to claim 2 is characterized in that: If the segment joint is provided with double-track sealing gaskets, adjusting the center line of the core pressure zone of the segment joint to move toward the inside of the segment includes moving each of the sealing gaskets toward the inside of the segment or setting the double-track sealing gaskets on the same side of the center line of the joint.

4. The design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure according to claim 1 is characterized in that: The adjustment of the centerline position of the core compression zone of the segment joint includes: If the maximum positive bending moment and maximum negative bending moment The difference is outside the set range, and the maximum positive bending moment Less than the maximum negative bending moment , then adjust the center line of the core compression zone of the segment joint to move toward the outside of the segment until the maximum positive bending moment and maximum negative bending moment The difference is within the set range.

5. The design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure according to claim 4 is characterized in that: If the segment joint is provided with double-track sealing gaskets, adjusting the center line of the core pressure zone of the segment joint to move toward the outside of the segment includes moving each of the sealing gaskets toward the outside of the segment or setting the double-track sealing gaskets on both sides of the center line of the joint.

6. The design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure according to claim 1 is characterized in that: The sealing gasket arrangement pattern includes the number of sealing gaskets and the positions of sealing gaskets.

7. The design method for regulating the toughness of a segment structure by utilizing a joint waterproof structure according to claim 1 is characterized in that: The sealing gasket is an EPDM rubber sealing gasket.

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