A seismic and resilient joint for shield tunneling and its construction method

Abstract

The present invention provides a seismic and ductile joint for shield tunneling, which includes bolts for connecting adjacent two segments and embedded bolt sleeves, and further includes an elastic cylinder. The elastic cylinder is installed into an elastic cylinder installation hole through an installation positioning ring. A backing plate is arranged between the elastic cylinder and the nut. The screw rod sequentially passes through the backing plate and the elastic cylinder, and a certain gap is formed between the elastic cylinder and the screw rod. The present invention also provides a construction method for the seismic and ductile joint for shield tunneling. By locally adding an elastic cylinder at the bolt hole, the present invention has a simple structure, is convenient for processing and installation, has a small installation space, offsets seismic loads by virtue of the high deformation ability of the elastic cylinder, improves the seismic performance and ductility of the joint. The operator can change the deformation ability of the bolt joint by changing the length of the elastic cylinder. Moreover, because conventional bolt forms and sizes are adopted and the elastic cylinder is made of plastic material, the cost is low and it can be replaced, without significantly increasing the project cost.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel engineering, and particularly relates to a seismic resilient joint for shield tunneling and a construction method thereof. Background Art

[0002] The segments of shield tunnels are mainly connected by bolts. Due to the limited length of the bolts, they cannot meet the large deformation requirements under seismic action, and the seismic performance is limited. The existing technology is to add steel springs or rubber gaskets at the bolt backing plate part to increase the telescopic length of the bolts. However, the conventional steel springs have small stiffness and are almost completely compressed under the action of the bolt installation pre-tightening force, almost losing their seismic function. If the spring stiffness is increased, it is necessary to significantly increase the spring wire diameter and improve the spring wire strength, which will lead to an increase in the installation space and the bolt manhole, causing adverse effects on the structural force and making the installation difficult. Moreover, due to the low elastic modulus, small thickness, weak deformation ability of the rubber gasket, and it is extremely easy to reach yield or even failure during bolt installation and lose the elastic deformation ability. Therefore, these two methods are difficult to apply to the project.

[0003] For the existing shield tunneling inclined bolt sleeve structure that can improve the seismic performance of bolts, the Chinese invention patent with the application number CN202111352125.7 discloses a special composite sleeve for inclined bolts in shield tunnels with a shock absorption effect. By screwing an inner sleeve and an outer sleeve in sequence outside the bolt to form a composite sleeve, when an earthquake occurs, the rigid threads between the bolt and the inner side of the inner sleeve and between the sleeve side segment and the outer side of the outer sleeve ensure stable connection. At the same time, the rigid threads and flexible threads in the inner sleeve engage and slide with the flexible threads on the inner side of the outer sleeve, and the sliding friction force, the shear force between the threads, and the viscous force between the flexible threads - flexible threads are used to jointly offset the seismic load, making the deformation of the shield tunnel joint smaller and smoother, enhancing the deformation performance and improving the shock absorption effect. However, this composite sleeve is only applicable to inclined bolts, and both the inner sleeve and the outer sleeve need to be customized according to the actual bolt size, increasing the manufacturing cost, and the sliding between the inner sleeve and the outer sleeve may be interfered by the structure during actual use, and it is difficult to ensure the actual effect of offsetting the seismic load.

[0004] Therefore, there is an urgent need for a seismic resilient joint for shield tunneling and a construction method thereof with a simpler structure and installation operation, which can improve its own seismic performance, has strong deformation ability, and will not increase too much installation space. Summary of the Invention

[0005] The purpose of the invention is to provide a seismic resilient joint for shield tunneling and a construction method thereof in view of the deficiencies of the existing technology, aiming to solve the problems such as insufficient deformation ability, poor seismic performance, increased installation space when improving the seismic performance, adverse effects on the segment structure force, and difficult installation of the existing joints using steel springs and rubber gaskets.

[0006] To solve the above technical problems, the present invention provides a seismic resilient joint for shield tunneling, which includes bolts and embedded bolt sleeves for connecting two adjacent segments. The bolt includes a screw rod and a nut provided at one end of the screw rod. The other end of the screw rod passes through the joint of the two segments and is connected to the embedded bolt sleeve. A bolt hole adapted to the bolt is provided in one of the segments with a nut installed. The seismic resilient joint for shield tunneling further includes an elastic cylinder. An elastic cylinder installation hole communicating with the bolt hole is also provided in the segment. The central axis of the elastic cylinder installation hole coincides with the central axis of the bolt hole. The elastic cylinder is installed into the elastic cylinder installation hole through an installation positioning ring. A backing plate is provided between the elastic cylinder and the nut. The screw rod sequentially passes through the backing plate and the elastic cylinder, and a certain gap is formed between the elastic cylinder and the screw rod.

[0007] In some embodiments, the elastic cylinder is a high-strength plastic component, and the inner diameter of the elastic cylinder is 6 - 8 mm larger than the diameter of the screw rod.

[0008] In some embodiments, the length of the elastic cylinder is greater than the depth of the elastic cylinder installation hole.

[0009] Further, in some embodiments, the installation positioning ring is a rubber ring with a low elastic modulus.

[0010] Further, in some embodiments, the aperture of the bolt hole is larger than the aperture of the elastic cylinder installation hole.

[0011] The present invention also provides a construction method using the above seismic resilient joint for shield tunneling, which includes the following steps:

[0012] S1. According to the parameters of the actual tunnel and seismic requirements, calculate the data parameters of each structure of the joint and fabricate each structure of the joint.

[0013] S2. Prefabricate the handhole side segment and the sleeve side segment, embed the bolt sleeve into the joint of the sleeve side segment, and prefabricate bolt holes and elastic cylinder installation holes on the handhole side segment.

[0014] S3. Segment assembly.

[0015] S4. Sleeve the installation positioning rings on the upper and lower ends of the elastic cylinder and insert them into the elastic cylinder installation hole.

[0016] S5. Place the backing plate in the bolt hole, drive in the bolt, and complete the construction of the joint.

[0017] In some embodiments, in S2, use conventional bolt installation and embedding means to preset the bolt hole, then reduce the preset aperture, and form the elastic cylinder installation hole along the coaxial direction of the bolt hole.

[0018] In some embodiments, in S5, the operator can select pads with different outer diameters according to the actual seismic requirements of the tunnel to control the deformation of the elastic cylinder.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In the present invention, elastic cylinder mounting holes are locally added at the bolt holes, and the elastic cylinders are mounted in the elastic cylinder mounting holes. The high deformation ability of the elastic cylinders and the gap between the elastic cylinders and the screw rods are used to offset the seismic load, improving the seismic performance and toughness of the joints. The overall structure is simple, and the processing of the elastic cylinder mounting holes and the installation of the elastic cylinders are both convenient. The installation space is small, reducing the adverse impact on the overall structure of the segment. The operator can also change the deformation ability of the bolt joint by changing the length of the elastic cylinder, improving the controllability of the seismic performance and toughness of the joint, enhancing the practicality of the joint. Moreover, because conventional bolt forms and sizes and elastic cylinders made of high-strength plastic materials are adopted, the cost is low and they can be replaced, without significantly increasing the project cost. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the seismic and ductile joint provided in the embodiment of the present invention;

[0022] Figure 2 It is a partially enlarged schematic diagram of the elastic cylinder provided in the embodiment of the present invention.

[0023] Among them, 1. Elastic cylinder; 2. Installation positioning ring; 3. Elastic cylinder mounting hole; 4. Embedded bolt sleeve; 5. Screw rod; 6. Pad; 7. Nut; 8. Bolt hole. Detailed Embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0026] The present invention will be further described below in conjunction with specific embodiments, but it is not limited to the present invention.

[0027] The present invention provides a seismic resilient joint for shield tunneling, which includes a bolt connecting adjacent two segments and a pre-embedded bolt sleeve 4. The bolt includes a screw rod 5 and a nut 7 arranged at one end of the screw rod 5. The other end of the screw rod 5 passes through the joint of the two segments and is connected to the pre-embedded bolt sleeve 4. A bolt hole 8 adapted to the bolt is provided in one of the segments where the nut 7 is installed. The seismic resilient joint for shield tunneling further includes an elastic cylinder 1. An elastic cylinder installation hole 3 communicating with the bolt hole 8 is also provided in the segment. The central axis of the elastic cylinder installation hole 3 coincides with the central axis of the bolt hole 8. The elastic cylinder 1 is installed into the elastic cylinder installation hole 3 through an installation positioning ring 2. A backing plate 6 is arranged between the elastic cylinder 1 and the nut 7. The screw rod 5 passes through the backing plate 6 and the elastic cylinder 1 in sequence, and a certain gap is formed between the elastic cylinder 1 and the screw rod 5.

[0028] During installation, first install the installation positioning ring 2 on the outer side of the elastic cylinder 1, and insert the elastic cylinder 1 into the elastic cylinder installation hole 3. Then, the elastic cylinder 1 can be stably installed in the elastic cylinder installation hole 3 by means of the friction force of the installation positioning ring 2. Then, the bolt is installed. The elastic cylinder 1 can be stably installed in the elastic cylinder installation hole 3 only by means of the friction force of the installation positioning ring 2. When the installation of the entire bolt joint is completed, one end of the elastic cylinder contacts the nut 7 through the backing plate. The elastic force of the elastic cylinder 1 cooperates with the bolt tension force, so that the entire bolt joint has a certain telescopic ability on the basis of ensuring stable connection. When the segment vibrates horizontally under the action of seismic load, the screw rod is subjected to a horizontal force, which can be decomposed into a force along the axial direction of the screw rod and a force along the radial direction of the screw rod. The elastic force of the elastic cylinder 1 itself cooperates with the bolt tension force, so that the entire bolt joint has a certain telescopic ability while ensuring stable connection, offsetting the force of the seismic load on the axial direction of the screw rod. At the same time, the screw rod 5 moves under the radial force, and the gap between the elastic cylinder 1 and the screw rod 5 provides a radial movement space inside the segment for the screw rod 5. When the movement range exceeds the gap, the outer side of the screw rod 5 contacts the inner side of the elastic cylinder 1. The elastic cylinder 1 converts the kinetic energy of the screw rod 5 into elastic potential energy and deforms within the gap, providing a supporting force for the screw rod 5, offsetting the force of the seismic load on the radial direction of the screw rod, further offsetting the seismic load, reducing the pressure on the segment, and improving the seismic performance and toughness of the overall bolt joint.

[0029] In the present invention, by locally adding an elastic cylinder mounting hole 3 at the bolt hole 8 and installing the elastic cylinder 1 in the elastic cylinder mounting hole 3, the high deformation ability of the elastic cylinder 1 and the gap between the elastic cylinder 1 and the screw 5 are utilized to offset the seismic load, thereby enhancing the seismic performance and toughness of the joint. The overall structure is simple, the processing of the elastic cylinder mounting hole and the installation of the elastic cylinder are both convenient, the installation space is small, the adverse impact on the overall structure of the segment is reduced, and the operator can change the deformation ability of the bolt joint by changing the length of the elastic cylinder 1, improving the controllability of the seismic performance and toughness of the joint and enhancing the practicality of the joint. Among them, the bolt is a commonly used bolt for shield tunnels, and a straight bolt, a bent bolt or an inclined bolt can be selected, reducing the improvement cost.

[0030] In some preferred embodiments, the elastic cylinder 1 is a high-strength plastic component, and the inner diameter of the elastic cylinder 1 is 6 - 8 mm larger than the diameter of the screw 5, providing an internal movable space for the screw 5 and the elastic cylinder 1, which is beneficial for the elastic cylinder 1 to deform after absorbing the kinetic energy of the screw 5 and reducing the adverse impact of the seismic load on the segment.

[0031] In some preferred embodiments, the length of the elastic cylinder 1 is greater than the depth of the elastic cylinder mounting hole 3. On the one hand, it is convenient for one end of the elastic cylinder 1 in the installed state to contact the backing plate. When the entire bolt joint is installed, the elastic force of the elastic cylinder 1 acts on the nut through the backing plate, and the tightening force of the bolt is applied to one end of the elastic cylinder 1 through the nut and the backing plate, realizing the interaction and cooperation between the elastic force of the elastic cylinder 1 and the tightening force of the bolt, restricting the elongation of the elastic cylinder 1 in the axial direction of the bolt, and improving the telescopic ability of the overall bolt joint. On the other hand, the operator controls whether one end of the elastic cylinder 1 is in a state of being limitedly extended out of the elastic cylinder mounting hole 3 to exert its telescopic property and high deformation force or in a state of being completely pressed into the elastic cylinder mounting hole 3 without exerting its telescopic property by changing the outer diameter of the backing plate and the magnitude of the bolt tightening force to meet different construction requirements.

[0032] In some preferred embodiments, the installation positioning ring 2 is a low elastic modulus rubber ring. By utilizing the low elastic modulus and high friction of the installation positioning ring 2, it is ensured that the elastic cylinder 1 can be stably installed in the elastic cylinder mounting hole 3 only with the help of the installation positioning ring 2. The installation process of the elastic cylinder 1 is completely independent of the bolt structure. During installation, the elastic cylinder 1 and the bolt are kept close but not in contact, avoiding structural interference, simplifying the force relationship among the elastic cylinder 1, the screw 5 and the segment. In this way, the deformation of the elastic cylinder 1 can act as much as possible on offsetting the seismic load. By adopting the method of increasing the telescopic amount of the bolt joint and the method of converting the kinetic energy of the bolt into elastic potential energy deformation to offset the seismic load, the pressure on the segment is reduced, and the seismic performance and toughness of the overall bolt joint are enhanced.

[0033] In some specific extended embodiments, the installation positioning ring 2 is arranged at the upper and lower ends of the elastic cylinder 1, the inner diameter of the installation positioning ring 2 is slightly smaller than the outer diameter of the elastic cylinder 1, and the outer diameter of the installation positioning ring 2 is slightly larger than the elastic cylinder mounting hole 3, so as to cooperate with the elastic cylinder 1 to be stably installed in the elastic cylinder mounting hole 3.

[0034] In some specific extended embodiments, the diameter of the bolt hole 8 is larger than the diameter of the elastic cylinder mounting hole 3, so as to facilitate the installation of a gasket 6 whose outer diameter is larger than the outer diameter of the elastic cylinder 1. When the actual construction pays more attention to the connection stability between the pipe segments, the operator installs the bolts so that the gasket uses the tightening force of the bolts to press the elastic cylinder 1 into the mounting hole of the elastic cylinder 1, thereby limiting the deformation performance of the elastic cylinder 1 and achieving control over the deformation performance of the elastic cylinder 1.

[0035] The present invention also provides a construction method for the shield tunnel seismic toughness joint, comprising the following steps:

[0036] S1. According to the actual tunnel parameters and seismic requirements, the data parameters of each joint structure are calculated and the joint structures are manufactured;

[0037] S2, prefabricate the handhole side segment and the sleeve side segment, embed the bolt sleeve into the joint of the sleeve side segment, and prefabricate the bolt hole 8 and the elastic cylinder installation hole 3 on the handhole side segment;

[0038] S3, segment assembly;

[0039] S4, fitting the mounting locating ring 2 onto the upper and lower ends of the elastic cylinder 1, and inserting it into the mounting hole 3 of the elastic cylinder;

[0040] S5. Place the backing plate 6 in the bolt hole 8, drive the bolts, and complete the joint construction.

[0041] In some specific extended embodiments, in S2, a bolt hole 8 is preset by using conventional bolt installation embedding means, and then the preset hole diameter is reduced, and an elastic cylindrical mounting hole 3 is formed along the coaxial direction of the bolt hole 8, which simplifies the processing process of the elastic cylindrical mounting hole 3 and reduces the construction difficulty.

[0042] In some specific extended embodiments, in S5, the operator can select pads 6 with different outer diameters according to the actual seismic requirements of the tunnel, and use the selection of the pads 6 to control the exertion of the deformation ability of the installed elastic cylinder 1 during actual construction. When the actual construction situation pays more attention to the tightness of the connection and there are strict restrictions on the opening amount of the joint, a pad 6 with an outer diameter larger than that of the elastic cylinder 1 is selected. With the driving of the bolts, the elastic cylinder 1 is pressed against the installation hole of the elastic cylinder 1 to limit the exertion of the deformation ability of the elastic cylinder 1. When the actual construction situation pays more attention to the seismic performance between the segments and it is necessary to fully exert the ductility and toughness of the joint, a pad 6 with an outer diameter smaller than that of the elastic cylinder 1 is selected, so that the elastic cylinder 1 can fully exert its own deformation ability to offset the seismic load.

[0043] In some specific extended embodiments, before manufacturing each structure of the joint, the operator needs to calculate the specific dimensions of the elastic cylinder 1, the diameter of the elastic cylinder installation hole 3, the bolt pad 6 and other parameters. The calculation methods are as follows:

[0044] (1) Obtain the required bolt tension T and the required deformation ability δ along the bolt direction according to the tunnel seismic design;

[0045] (2) According to the bolt tension T, select the material, diameter d1, area A1, tensile strength P and other parameters of the bolt itself according to the existing bolt material standards;

[0046] (3) Calculate the length L1 of the bolt and the elongation Δ1 when it reaches yield according to the segment structure design;

[0047] (4) Select the material of the elastic cylinder 1. According to the material properties, obtain the compressive yield strength σ of the elastic cylinder 1. Calculate the required deformation ability Δ2 of the elastic cylinder 1 according to the required deformation ability δ of the joint and the bolt deformation ability. Δ2 = δ - Δ1;

[0048] (5) Calculate the required cross-sectional area A2 of the elastic cylinder 1 = P÷σ according to the bolt tensile strength P and the compressive yield strength σ of the elastic cylinder 1;

[0049] (6) Calculate the stiffness K1 of the bolt according to the elastic modulus E1, length L1 and area A1 of the bolt. K1 = E1×A1÷L1;

[0050] (7) Assume the length of the elastic cylinder 1 is L2. According to the elastic modulus E2 and area A2 of the elastic cylinder 1, calculate the stiffness K2 of the elastic cylinder 1. K2 = E2×A2÷L2;

[0051] (8) Calculate the length L2 of the elastic cylinder 1 according to the force balance of the bolt tension and the elastic cylinder 1 pressure, that is, K1×Δ1 = K2×Δ2;

[0052] (9) Based on the calculation results, the specific dimensions of the elastic cylinder 1, the diameter of the elastic cylinder mounting hole 3, the bolt backing plate 6 and other parameters are obtained. Among them, the inner diameter of the elastic cylinder 1 needs to be slightly larger than the diameter of the screw 5 (about 6 - 8 mm) to facilitate the installation of the screw 5, and the outer diameter is calculated inversely according to the area A2; the inner diameter of the installation positioning ring 2 of the elastic cylinder 1 needs to be slightly smaller than the outer diameter of the elastic cylinder 1 to facilitate the installation positioning ring 2 to tightly fit the elastic cylinder 1, and the outer diameter is slightly larger than the diameter of the elastic cylinder mounting hole 3 to facilitate fixation; the diameter of the elastic cylinder mounting hole 3 is slightly larger than the outer diameter of the elastic cylinder 1 to leave appropriate space for the lateral deformation of the elastic cylinder 1 after compression.

[0053] For easy understanding, taking a certain project as an example, the structural dimensions of the seismic joint are calculated and analyzed. The inclined bolt connection is adopted at the joint of this project.

[0054] (1) Seismic force and deformation requirements of the joint

[0055] According to the structural design and seismic calculation analysis, it is obtained that the required bolt tension T ≥ 600 kN, and the deformation capacity δ ≥ 6 mm along the inclined bolt direction.

[0056] (2) Bolt parameters

[0057] According to the bolt tension T, and in accordance with the existing bolt material standards, 8.8 - grade M36 bolts are selected. Its yield tensile strength P = 650 kN, the diameter is d1 = 36 mm, and the area A1 = 1020 mm 2 .

[0058] (3) Bolt length and yield elongation

[0059] According to the segment structure design, the calculated bolt length L = 600 mm, and the elongation Δ1 = 1.92 mm when the bolt reaches yield.

[0060] (4) Calculation of the deformation of the elastic cylinder 1

[0061] The elastic cylinder 1 is made of ABS plastic, and its compressive yield strength σ = 50 MPa. According to the required joint deformation capacity δ = 6 mm and the bolt deformation capacity Δ1 = 1.92 mm, the required deformation capacity Δ2 of the elastic cylinder 1 is calculated, that is: Δ2 = δ - Δ1 = 4.08 mm.

[0062] (5) Calculation of the cross - sectional area of the elastic cylinder 1

[0063] According to the bolt tensile strength P = 650 kN and the compressive yield strength σ = 50 MPa of the elastic cylinder 1, the required cross - sectional area A2 of the elastic cylinder 1 is calculated, that is A2 = P÷σ = (650×10 3 )÷(50×10 6 ) = 13000 mm 2 .

[0064] (6) Bolt stiffness calculation

[0065] The elastic modulus of the bolt E1 = 200 GPa, the length L1 = 600 mm, and the area A1 = 1020 mm 2 , and the stiffness of the bolt K1 = E1 × A1 ÷ L1 = 3.4×10 8 N / m 2 .

[0066] (7) Stiffness calculation of elastic cylinder 1

[0067] Assume the length of elastic cylinder 1 is L2, the elastic modulus of elastic cylinder 1 E2 = 1.8 GPa, and the area A2 = 13000 mm 2 , calculate the stiffness K2 of elastic cylinder 1, K2 = E2 × A2 ÷ L2 = 2.34×10 7 ÷L2.

[0068] (8) Length calculation of elastic cylinder 1

[0069] According to the force balance between the bolt tension and the pressure of elastic cylinder 1, K1×Δ1 = K2×Δ2, calculate the length L2 of elastic cylinder 1 = 146 mm.

[0070] (9) Determine relevant parameters

[0071] Based on the calculation results, the specific parameters of elastic cylinder 1 are as follows:

[0072] ① Elastic cylinder 1: Made of ABS plastic material, with an elastic modulus of 1.8 GPa, a yield strength of 50 MPa, an inner diameter of 42 mm, a screw diameter of 36 mm, an outer diameter of 135.5 mm, and a length of 146 mm. If an anti-corrosion protective layer is added to the surface of elastic cylinder 1, the dimensions can be adjusted as needed.

[0073] ② Installation positioning rings 2 of elastic cylinder 1: 2 pieces, with an inner diameter of 134 mm, an outer diameter of 138.5 mm, and the thickness is determined according to its material and the squeezing force. After being properly stretched, the installation positioning rings 2 are sleeved on the upper and lower ends of elastic cylinder 1, or can be integrally made with elastic cylinder 1.

[0074] ③ Elastic cylinder installation hole 3: With a diameter of 137.5 mm, slightly larger than the outer diameter of elastic cylinder 1 to leave appropriate space for the lateral deformation after compression of elastic cylinder 1, and a depth of 141 mm.

[0075] ④ Bolt spacer 6: When there are strict restrictions on the opening amount of the joint, the outer diameter of spacer 6 should be larger than the outer diameter of elastic cylinder installation hole 3, recommended 180 mm; when it is necessary to fully exert the ductility and toughness of the joint, the outer diameter of spacer 6 should be slightly smaller than the outer diameter of elastic cylinder installation hole 3, recommended 136.5 mm.

[0076] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention. For those skilled in the art, it should be realized that all the solutions obtained by equivalent substitution and obvious changes made by using the content of the specification of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for an earthquake-resistant and ductile joint of a shield tunneling method tunnel, characterized in that, It includes the following steps: S1. According to the parameters of the actual tunnel and the seismic requirements, calculate the data parameters of each structure of the joint, and fabricate each structure of the joint; The joint includes bolts and embedded bolt sleeves for connecting two adjacent segments. The bolt includes a screw rod and a nut arranged at one end of the screw rod. The other end of the screw rod passes through the joint of the two segments and is connected to the embedded bolt sleeve. A bolt hole adapted to the bolt is provided in one of the segments with a nut installed. It further includes an elastic cylinder. An elastic cylinder installation hole communicating with the bolt hole is also provided in the segment. The central axis of the elastic cylinder installation hole coincides with the central axis of the bolt hole. The elastic cylinder is installed into the elastic cylinder installation hole through an installation positioning ring. A backing plate is arranged between the elastic cylinder and the nut. The screw rod sequentially passes through the backing plate and the elastic cylinder, and a certain gap is formed between the elastic cylinder and the screw rod; The calculation method of the data parameters of each structure of the joint includes: Derive the required bolt tension according to the seismic design of the tunnel and the required deformation capacity along the bolt direction ; According to the bolt tension , calculate the material selection, diameter , area and tensile strength of the bolt itself according to the existing bolt material standards; According to the segment structure design, the length of the bolt is calculated and the elongation at yield ; Select materials for the elastic cylinder, and obtain the compressive yield strength of the elastic cylinder based on the material properties , according to the required deformation ability of the joint and the deformation ability of the bolt, calculate the required deformation ability of the elastic cylinder , ; According to the tensile strength of the bolt and the compressive yield strength of the elastic cylinder , the required cross-sectional area of the elastic cylinder is calculated ; According to the elastic modulus of the bolt , length and area , calculate the stiffness of the bolt , ; Suppose the length of the elastic cylinder is , according to the elastic modulus of the elastic cylinder, the area , calculate the stiffness of the elastic cylinder, ; According to the force balance between the bolt tension and the pressure of the elastic cylinder, that is , calculate the length of the elastic cylinder ; According to the calculation results, the specific dimensions of the elastic cylinder and the diameter of the installation hole of the elastic cylinder are obtained; among them, the inner diameter of the elastic cylinder is larger than the diameter of the screw, and the outer diameter of the elastic cylinder is calculated by inverse calculation according to the area The inner diameter of the installation positioning ring of the elastic cylinder is smaller than the outer diameter of the elastic cylinder, and the outer diameter of the installation positioning ring of the elastic cylinder is larger than the diameter of the installation hole of the elastic cylinder; the diameter of the installation hole of the elastic cylinder is larger than the outer diameter of the elastic cylinder; S2. Prefabricate the handhole side segment and the sleeve side segment, embed the bolt sleeve into the joint of the sleeve side segment, and prefabricate bolt holes and elastic cylinder installation holes on the handhole side segment; S3. Segment assembly; S4. Sleeve the installation positioning rings on the upper and lower ends of the elastic cylinder and insert them into the elastic cylinder installation holes; S5. Place a backing plate in the bolt hole, drive in the bolt, and complete the joint construction.

2. The construction method of the aseismic and ductile joint for shield tunneling according to claim 1, characterized in that, In S2, use the conventional bolt installation and embedding means to preset the bolt hole, then reduce the preset hole diameter, and deepen it along the coaxial direction of the bolt hole to form the elastic cylinder installation hole.

3. The construction method of the seismic and ductile joint for shield tunneling according to claim 1, characterized in that, In S5, the operator selects backing plates with different outer diameters according to the actual seismic requirements of the tunnel to control the deformation of the elastic cylinder.

Images