Design method for regulating and controlling structural toughness of duct piece by using joint waterproof structure

Abstract

The invention relates to a design method for regulating and controlling the structural toughness of a duct piece through a joint waterproof structure. The method comprises the following steps: establishing a segment structure model; initial internal force of the segment structure is calculated, and the maximum positive bending moment M positive and the maximum negative bending moment M negative of the segment structure are obtained; and if the difference value between the maximum positive bending moment M positive and the maximum negative bending moment M negative is out of the set range, the position of the center line of the segment joint core pressed area is adjusted by adjusting the arrangement type of the sealing gaskets, so that the difference value between the maximum positive bending moment M positive and the maximum negative bending moment M negative is within the set range. According to the method, the position of the center line of the segment joint core compression area is changed by changing the arrangement type of the shield tunnel joint sealing gasket, then the internal force of the segment structure is adjusted, the toughness of the segment structure is enhanced, the waterproof capacity of the segment joint is guaranteed, meanwhile, segment structure reinforcing bars can be saved, and the safety coefficient of the segment structure can be improved.

Description

Technical Field

[0001] The 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 fields, shield tunnels have shown characteristics such as large diameter, deep burial depth, high water pressure, and complex geological conditions. The shield tunnel segment lining structure is usually an underground prefabricated structure composed of reinforced concrete segments connected by bolts. The presence of a large number of joints greatly weakens the rigidity and integrity of the segment lining structure. In the design and construction of underwater shield tunnels, the design of segment joints is a crucial link. On the one hand, the mechanical characteristics of the joints will significantly affect the mechanical characteristics of the entire tunnel, and then affect the overall stability and durability of the tunnel. On the other hand, in order to adapt to the great challenges to the waterproof performance of shield tunnels brought by high water pressure, the waterproof design of the joints is also a crucial link to ensure the safety of the tunnel.

[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, which also makes the joint present obvious nonlinear characteristics. The layout of waterproof gaskets directly affects the structure of the joint surface, and then 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 problem, but a comprehensive problem involving the mechanical properties of the overall lining structure of the shield tunnel. 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] The shield tunnel segment ring is formed by assembling multiple prefabricated reinforced concrete segments. When the segment is reinforced, it is often necessary to reinforce it according to the maximum positive bending moment and the maximum negative bending moment to which the segment ring is subjected. If the internal force of the segment structure can be properly adjusted to minimize the difference between the maximum positive bending moment and the maximum negative bending moment to which the segment ring is subjected, it can save reinforcement and improve the safety factor of the segment structure, thereby enhancing the robustness of the segment structure. At the same time, under the action of accidental loads, such as earthquakes, the segment joints may reciprocate. Reducing the difference in the maximum positive and negative bending moments of the segment structure can effectively avoid the segment from being damaged due to excessive bending moment on one side, thereby improving the seismic toughness of the tunnel. However, in existing studies, there is no report on the study of adjusting the arrangement of waterproof sealing pads on the segment joint surface to reduce the difference between the maximum positive and negative bending moments of the segment structure, thereby regulating the toughness of the segment structure. 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 using a joint waterproof structure, comprising the following steps:

[0006] Establish the 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, the position of the center line of the core compression zone of the segment joint is adjusted by adjusting the sealing gasket layout so that the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within the set range.

[0010] Further, the adjusting 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 compression zone of the segment joint to move inwardly of the segment includes moving each of the sealing gaskets inwardly of the segment or arranging the double-track sealing gaskets on the same side of the center line of the joint.

[0013] Further, the adjusting 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 compression 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 respectively arranging 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 method further includes:

[0017] According to the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The real-time bending stiffness of the segment joint is obtained, and the real-time bending stiffness is compared with the ideal bending stiffness. According to the difference between the real-time bending stiffness and the ideal bending stiffness, the position of the center line of the core compression zone of the segment joint is adjusted.

[0018] Furthermore, the sealing gasket arrangement pattern includes the number of sealing gaskets and the positions 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 center line of the core compression zone of the segment joint by changing the arrangement type 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 reinforcement of the segment structure and improve the safety factor of the segment structure, providing a new idea for the design of the shield tunnel segment structure.

[0022] 2) The method of adjusting the internal force of the structure of the present invention has little adjustment to the structure of the pipe segment joint, is easy to implement, is relatively easy to realize, and ensures 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0024] Figure 1 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 in an embodiment of the present invention;

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

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

[0028] Figure 5 It is a diagram of a segment ring refinement numerical calculation model 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the drawings, the size and relative size of some parts may be enlarged for clarity.

[0031] In the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connection" and "connected" should be interpreted in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral 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", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0033] In addition, in the description of the present invention, the terms "first" and "second" are only used to distinguish in the description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In addition, the features defined as "first" and "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 the 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, the position of the center line of the core compression zone of the segment joint is adjusted by adjusting the sealing gasket layout so that 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 the shield tunnel segment is a discontinuous structure. Along the thickness direction of the segment, due to the presence of structures such as waterproof sealing gasket grooves, the bearing area of ​​the concrete on the joint surface is reduced, which weakens the bending stiffness and bearing capacity of the joint to a certain extent. Sealing gaskets are arranged between adjacent segments for waterproof sealing. The arrangement type of sealing gaskets will directly affect the mechanical properties of the joint. Among them, the arrangement type of sealing gaskets includes the number of sealing gaskets and the position of sealing gaskets. The number and position of sealing gaskets in the segment joints have an impact on the mechanical properties of the joints. The core compression area of ​​the segment joint can be determined according to the arrangement type of sealing gaskets in the segment joints, and the center line of the core compression area of ​​the segment joints can be determined. By adjusting the arrangement type of sealing gaskets in the segment joints, the position of the center line of the core compression area of ​​the segment joints can be adjusted, and then the internal force of the segment structure can be regulated to enhance the toughness of the segment structure. The core compression zone of the segment joint refers to the area of ​​the joint surface excluding the sealing gasket groove, caulking groove and other structures. The height of the core compression zone is equal to the thickness of the segment joint excluding the height of the sealing gasket groove and caulking groove and other structures. The center line of the core compression zone of the segment joint is the center line of the core compression zone height. The center line of the segment joint refers to the center line of the thickness of the segment joint.

[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 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 segment structure are equal, and at this time, the difference between the two is 0.

[0041] In an optimized implementation mode, the method further comprises: 正 and the maximum negative bending moment M 负Obtain the bending stiffness of the segment joint, compare the bending stiffness with the ideal bending stiffness, and adjust the position of the centerline of the core compression zone of the segment joint according to the difference between the bending stiffness and the ideal bending stiffness, where the bending stiffness includes positive bending stiffness and negative bending stiffness. The bending stiffness of the segment joint can be adjusted according to the arrangement of the sealing gasket. The essence of affecting the bending 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 bending stiffness of the segment joint can be adjusted by adjusting the arrangement of the sealing gasket, thereby regulating the internal force of the segment structure and enhancing the toughness of the segment structure.

[0042] As the instruction manual Figure 1 As shown in FIG. 1 , it is 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 according to 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 the segment is reinforced, it is necessary to arrange the reinforcement according to 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, and 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 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 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 正 With the maximum negative bending moment M 负 The difference between them is reduced or even equal, and 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 to 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 effect of increasing the maximum positive bending moment and thus reducing the difference between the maximum positive bending moment and the maximum negative bending moment to even 0 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 zone 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 zone and the center line of the joint, so that 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 segment joint is provided with double sealing pads, and two water stop grooves 2 are provided on the joint surface of the segment 1, and sealing pads 3 are provided in the water stop grooves 2 for waterproof sealing. The midline of the segment joint is determined, and the core pressure area 4 of the segment joint and its midline are determined according to the setting position of the sealing pad 3, so that 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 inner and outer double-pass sealing gasket arrangement in b is changed to Figure 3 The arrangement of the inner and outer double-pass sealing gaskets in a makes the center line of the core compression zone of the segment joint move inward, achieving the positive bending stiffness K 正 Reduced and negative bending stiffness K 负 In order to increase the effect, the internal force of the segment structure is recalculated according to the adjusted segment joint structure, and the maximum positive bending moment is compared with the maximum negative bending moment. 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 it is necessary to increase the positive bending stiffness K of the segment joint 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 compression area 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 Reduce, 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 compression area 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 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 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 In order to reduce the effect, the internal force of the segment structure is recalculated according to the adjusted segment joint structure, and the maximum positive bending moment is compared with the maximum negative bending moment. The above operation is repeated 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 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 the optimized implementation method, the internal force of the segment structure can be calculated by using a beam-spring model based on joint linear stiffness iteration 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 calculated by the above method.

[0052] The beam-spring model of joint nonlinear stiffness iteration is used for calculation. 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. Then, the joint nonlinear stiffness iteration algorithm is 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-pass sealing gasket includes two types: inner and outer double-pass sealing gaskets and outer double-pass 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-pass 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 attachment 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 4500kN and 12000kN respectively, the positive bending stiffness, negative bending stiffness and the ratio of the joints of the outer double-track and inner and outer double-track segments 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 detailed numerical calculation models of shield tunnel rings with two double-pass sealing pad structures were established. The numerical calculation models of the whole ring segments are shown in the attached manual. Figure 5 As shown, the concrete segments are embedded with steel cages.

[0061] Different magnitudes of earth pressure are applied according to actual conditions. The maximum positive bending moment, maximum negative bending moment and the ratio of the two moments to the entire ring segment of the shield tunnel are shown in Table 2.

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

[0063]

[0064] It can be seen from Table 2 that when the layout of the waterproof sealing pad 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 its 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 forces 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 this embodiment, 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 the segment structure by using the joint waterproof structure. It is characterized in that The following steps are involved: Establish the segment structure model; 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 ; Determine the maximum positive bending moment M 正 and the maximum negative bending moment M 负 Whether the difference is within the set range; If the maximum positive bending moment M 正 and the maximum negative bending moment M 负 If the difference is outside the set range, the position of the center line of the core compression zone of the segment joint is adjusted by adjusting the sealing gasket layout so that the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The difference is within the set range.

2. According to the design method of claim 1 for controlling the toughness of the segment structure by using the joint waterproof structure, It is characterized in that The adjusting of the centerline position of the core compression zone of the segment joint comprises: 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.

3. According to the design method of using joint waterproof structure to control the toughness of the pipe segment structure according to claim 2, It is characterized in that If the segment joint is provided with double-row sealing gaskets, adjusting the center line of the core compression 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-row sealing gaskets on the same side of the center line of the joint.

4. According to the design method of claim 1 for controlling the toughness of the segment structure by using the joint waterproof structure, It is characterized in that The adjusting of the centerline position of the core compression zone of the segment joint comprises: 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.

5. According to the design method of claim 4 for controlling the toughness of the segment structure by using the joint waterproof structure, It is characterized in that If the segment joint is provided with double-track sealing gaskets, adjusting the center line of the core compression 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 respectively arranging the double-track sealing gaskets on both sides of the center line of the joint.

6. The design method for controlling the toughness of the segment structure by using the joint waterproof structure according to claim 1, It is characterized in that Before adjusting the position of the center line of the core compression zone of the segment joint, it also includes: According to the maximum positive bending moment M 正 and the maximum negative bending moment M 负 The real-time bending stiffness of the segment joint is obtained, and the real-time bending stiffness is compared with the ideal bending stiffness. According to the difference between the real-time bending stiffness and the ideal bending stiffness, the position of the center line of the core compression zone of the segment joint is adjusted.

7. The design method for controlling the toughness of the segment structure by using the joint waterproof structure according to claim 1, It is characterized in that The sealing gasket arrangement pattern includes the number of sealing gaskets and the positions of sealing gaskets.

8. The design method for controlling the toughness of the segment structure by using the joint waterproof structure according to claim 1, It is characterized in that The sealing gasket is an EPDM rubber sealing gasket.

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