Method for assembling circumferentially equal rigidity shield segments

Abstract

The application relates to a method for assembling a circumferential equal-rigidity shield segment, which comprises the following steps: setting an end sealing plate and a plurality of multi-prism steel embedded parts on an arc-shaped shield segment during prefabrication; when two adjacent arc-shaped shield segments are butted along the circumferential direction, installing outer and inner fasteners with engagement structures, and locking through corresponding locking bolts; and finally achieving the purpose of assembling the plurality of arc-shaped shield segments along the circumferential direction to form a closed whole-ring structure. The application can form a uniform and continuous stress distribution along the circumferential direction of the adjacent arc-shaped shield segments, realize the circumferential equal-rigidity connection of the arc-shaped shield segments, greatly improve the overall rigidity of the shield segment ring, save the cost, and greatly prolong the service life of the shield segment.

Description

Technical Field

[0001] This invention relates to the field of shield tunnel segment assembly technology, specifically to a method for assembling shield tunnel segments with circumferential equal stiffness. Background Technology

[0002] As a core process in tunnel construction, the circumferential assembly of tunnel segments directly determines the overall stress performance, long-term operational safety, and risk of groundwater leakage of the tunnel structure.

[0003] With the diversification of shield tunnel segment connection structures, shield segment connection technology has seen diverse innovations in recent years. Reinforced concrete precast shield segments, as core components of underground transportation infrastructure construction, have been widely used due to their advantages in industrialized production, high construction efficiency, and environmental friendliness. However, significant technical bottlenecks still exist in the field of shield segment connection technology: First, the "circular multi-hinged" mechanical model formed by traditional single-row bolt connections results in weak overall structural stiffness, easily leading to centimeter-level displacements during construction in soft strata, which in turn induces major safety hazards such as water leakage at shield segment joints and concrete cracking. Second, limited by the structural characteristics of precast assembly structures, when there is insufficient construction space on the outside of the shield segment, existing connection technologies struggle to reliably connect the inner and outer main reinforcement bars, causing discontinuous force transmission paths and severely affecting the overall mechanical performance of the tunnel structure.

[0004] Based on this, a method for assembling circumferentially stiff shield tunnel segments that can overcome the above-mentioned defects is proposed to address the aforementioned problems.

[0005] It is understood that the above statements only provide background information related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for assembling shield tunnel segments with equal circumferential stiffness, which ensures uniform distribution of circumferential stress through the meshing and engagement of multi-prism steel embedded parts and fasteners and the control of equivalent pre-tightening force.

[0007] To achieve the above objectives, this invention provides a method for assembling circumferentially stiff shield tunnel segments. This method involves assembling multiple arc-shaped shield tunnel segments circumferentially to form a closed ring structure, comprising the following steps: S1, in the prefabrication stage, an end-sealing plate is fixedly installed on the circumferential connecting end face of each arc-shaped shield tunnel segment, and multiple polygonal prism-shaped steel embedded parts are installed at the intersection nodes of the inner and outer main reinforcement bars of each arc-shaped shield tunnel segment. After being cast with concrete, the segments are transported to the assembly site; S2, adjacent arc-shaped shield tunnel segments are joined circumferentially, so that the joining surfaces of the end-sealing plates are mutually abutted, and the outer polygonal prism-shaped steel embedded parts on the outer sides of the adjacent arc-shaped shield tunnel segments are correspondingly abutted, while the inner sides are abutted. S3. Install outer fasteners with interlocking structures at each pair of the polygonal steel embedded parts on the outer side, and install inner fasteners with interlocking structures at each pair of the polygonal steel embedded parts on the inner side; S4. Use a corresponding number of locking bolts to pass through the inner fasteners and end caps in sequence, and connect them to the outer fasteners. Apply torque to make the outer fasteners and inner fasteners form a compression fit with the corresponding interlocking surfaces of the polygonal steel embedded parts; S5. Use uniform torque to generate an equivalent preload force in the compression fit of each connection node, so that the adjacent arc-shaped shield tunnel segments form a uniform and continuous stress distribution in the circumferential direction.

[0008] Each of the aforementioned polyhedral steel embedded parts has a meshing surface; and the meshing surface of the inner polyhedral steel embedded part faces the center of the entire ring structure, while the meshing surface of the outer polyhedral steel embedded part faces a direction away from the center of the entire ring structure.

[0009] Preferably, on each arc-shaped shield tunnel segment, the polyhedral steel embedded parts are evenly spaced along the axial direction of the arc-shaped shield tunnel segment and symmetrically arranged on the outer and inner sides; after two adjacent arc-shaped shield tunnel segments are joined together circumferentially, two polyhedral steel embedded parts that are adjacent to each other on the outer and inner sides form a pair, and the two meshing surfaces of each pair of polyhedral steel embedded parts form a complete meshing part after being adjacent; wherein, the complete meshing parts of each pair of polyhedral steel embedded parts on the outer side are meshed with each outer fastener, and the complete meshing parts of each pair of polyhedral steel embedded parts on the inner side are meshed with each inner fastener.

[0010] Preferably, after two adjacent arc-shaped shield tunnel segments are joined together circumferentially, two pairs of polygonal steel embedded parts symmetrically arranged on the outer and inner sides form a group; wherein, multiple groups of polygonal steel embedded parts are arranged at intervals along the axial direction of the arc-shaped shield tunnel segments, and each group is connected and installed using a locking bolt.

[0011] Preferably, the mating surface of the end sealing plate is provided with concave positioning holes, and after adjacent end sealing plates are mated, a complete waist-shaped positioning hole is formed for the locking bolt to pass through; for each end sealing plate, the number of concave positioning holes provided on it is the same as the number of locking bolts, and the same as the number of polygonal prism steel embedded parts provided along the axial direction, and all are provided in a one-to-one correspondence.

[0012] Preferably, the outer fastener has a threaded groove and the inner fastener has a through hole; during installation, the locking bolt can pass through the through hole of the inner fastener and through the concave positioning hole of the end cap plate, and finally screw into the threaded groove of the outer fastener.

[0013] Preferably, in step S2, if the currently installed arc-shaped shield tunnel segment is not an arc-shaped shield tunnel segment in the first ring structure, the step further includes longitudinally assembling the arc-shaped shield tunnel segment onto the previous ring structure.

[0014] Preferably, step S4 specifically includes: S41, using two tool bolts to pre-position any two adjacent sets of polygonal prism steel embedded parts; S42, installing locking bolts on the remaining sets of polygonal prism steel embedded parts and applying torque; S43, after all circumferential connection nodes are tightened, removing the two tool bolts and replacing them with locking bolts and tightening them; wherein, the tool bolt is a continuous threaded rod, and its effective thread length is greater than that of the locking bolt.

[0015] Preferably, when installing several arc-shaped shield tunnel segments sequentially to the last segment of the complete ring structure, the last segment needs to be installed with staggered joints. Specifically, the following steps are included: First, align the outer fastener with the polyhedral steel embedded part of the adjacent installed arc-shaped shield tunnel segment, temporarily fix the outer fastener with a tool bolt, then push the last segment until its polyhedral steel embedded part and the outer fastener are embedded and engaged, then install the inner fastener, replace the tool screw with a locking bolt and tighten it.

[0016] Preferably, when the arc-shaped shield tunnel segments are assembled in a circumferential manner to form a complete ring structure, arc-shaped shield tunnel segments of the same size are spliced ​​together to form a uniform assembly.

[0017] Preferably, the contact surfaces of the polygonal steel embedded part, the outer fastener, the inner fastener and the locking bolt are all coated with waterproof material.

[0018] In summary, compared with the prior art, the assembly method of circumferentially uniform stiffness shield tunnel segments of the present invention has at least the following advantages:

[0019] (1) This invention ensures uniform distribution of circumferential stress by using the meshing and fastening of the multi-prism steel embedded parts and the equal pre-tightening force control, eliminating stress concentration in traditional bolts or single-point socket structures, thus greatly improving the overall stiffness of the shield tunnel segment ring. While saving costs, it greatly extends the service life of the shield tunnel segment and has great practicality.

[0020] (2) The present invention provides a normal secondary force of N level in the normal direction through several locking bolts to lock the inner and outer polygonal steel embedded parts, so that the inner and outer main steel bars of adjacent arc-shaped shield tunnel segments can transmit the radial primary force of kN level to achieve effective connection, prevent the joint from opening, and have extremely strong stability and fastening effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the shield tunnel segment connection structure in this invention;

[0022] Figure 2 This is a schematic diagram showing the fit between the embedded multi-prism steel profile of the tunnel segment and the fastener in this invention;

[0023] Figure 3 This is a schematic diagram of the staggered installation of the last shield tunnel segment in this invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Arc-shaped shield segment, 2-Main reinforcement, 3-Polygonal prism steel embedded part, 4-Outer fastener, 5-Inner fastener, 6-Locking bolt, 61-Tool bolt, 7-End sealing plate. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1 ~Attached Figure 3 The present invention will be further illustrated by describing a preferred embodiment in detail.

[0027] It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to facilitate and clarify the purpose of illustrating the embodiments of the present invention, and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationship, or adjustments to the size should still fall within the scope of the technical content disclosed in the present invention, provided that they do not affect the effects and objectives that the present invention can produce.

[0028] It should be noted that, in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only the expressly listed elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0029] In this invention, the arc-shaped shield tunnel segment 1 is an arc-shaped precast concrete component. Multiple arc-shaped shield tunnel segments 1 can be assembled circumferentially to form a closed ring structure, and continuous multi-ring structures are connected longitudinally along the tunnel axis to form a tunnel lining system. The first ring structure refers to the first ring formed by assembling multiple arc-shaped shield tunnel segments 1 in the initial section of tunnel construction, and subsequent assembled rings are collectively referred to as the next ring structure.

[0030] like Figure 1 and Figure 2 As shown, the present invention provides a method for assembling circumferentially stiff shield tunnel segments, comprising the following steps:

[0031] S1. During the prefabrication stage, end sealing plates 7 are fixedly installed on the circumferential connection end face of each arc-shaped shield tunnel segment 1, and multiple polygonal steel embedded parts 3 are installed at the intersection nodes of the inner and outer main reinforcements 2 of each arc-shaped shield tunnel segment 1. After being formed by concrete pouring, they are transported to the assembly site.

[0032] Each arc-shaped shield tunnel segment 1 has two sides in the thickness direction: an outer side and an inner side. The outer side refers to the outer arc surface of the arc-shaped shield tunnel segment 1, which is also the outer arc surface of the complete ring structure formed after splicing. The inner side refers to the inner arc surface of the arc-shaped shield tunnel segment 1, which is also the inner arc surface of the complete ring structure formed after splicing. On the outer side, multiple outer main reinforcements 2 are evenly spaced along the axial direction of the arc-shaped shield tunnel segment 1. On the inner side, multiple inner main reinforcements 2 are evenly spaced along the axial direction of the arc-shaped shield tunnel segment 1. It can be understood that the outer and inner main reinforcements 2 are symmetrically arranged, and a polygonal steel embedded part 3 is set at each intersection node of the inner and outer main reinforcements 2. Therefore, on each arc-shaped shield tunnel segment 1, the polygonal steel embedded parts 3 are evenly spaced along the axial direction of the arc-shaped shield tunnel segment 1, and are symmetrically arranged on the outer and inner sides of the arc-shaped shield tunnel segment 1.

[0033] Each of the polyhedral steel embedded parts 3 has a meshing surface with multiple levels of meshing teeth; and the meshing surface of the polyhedral steel embedded parts 3 located on the inner side faces the center of the ring structure, while the meshing surface of the polyhedral steel embedded parts 3 located on the outer side faces a direction away from the center of the ring structure.

[0034] S2. Connect two adjacent arc-shaped shield tunnel segments 1 in the circumferential direction so that the mating surfaces of the end sealing plates 7 fit together, and make the outer polygonal steel embedded parts 3 on the two adjacent arc-shaped shield tunnel segments 1 correspond to each other and the inner polygonal steel embedded parts 3 correspond to each other.

[0035] S3. Install an outer fastener 4 with an interlocking structure at each pair of the polygonal steel embedded parts 3 located on the outer side, and install an inner fastener 5 with an interlocking structure at each pair of the polygonal steel embedded parts 3 located on the inner side.

[0036] It is understandable that after two adjacent arc-shaped shield tunnel segments 1 are joined together circumferentially, two polygonal steel embedded parts 3 that are attached to each other on the outer and inner sides respectively constitute a pair of polygonal steel embedded parts 3. Obviously, the two meshing surfaces of each pair of polygonal steel embedded parts 3 will form a complete meshing part after they are adjacent. Among them, the complete meshing parts of each pair of polygonal steel embedded parts 3 on the outer side are used to mesh with each outer fastener 4 respectively, and the complete meshing parts of each pair of polygonal steel embedded parts 3 on the inner side are used to mesh with each inner fastener 5 respectively.

[0037] S4. The corresponding number of locking bolts 6 pass through the inner fastener 5 and the end sealing plate 7 in sequence and are connected to the outer fastener 4. A torque is applied so that the outer fastener 4 and the inner fastener 5 respectively form a compression fit with the corresponding meshing surfaces of the polygonal steel embedded part 3.

[0038] It is understandable that after two adjacent arc-shaped shield tunnel segments 1 are connected in the circumferential direction, two pairs of prismatic steel embedded parts 3 symmetrically set on the outer and inner sides form a group. Therefore, multiple groups of prismatic steel embedded parts 3 are set at intervals along the axial direction of the arc-shaped shield tunnel segment 1, and each group is installed with a locking bolt 6.

[0039] S5. By using uniform torque to generate an equivalent preload through the compression fit of each connection node, a uniform and continuous stress distribution is formed in the circumferential direction of adjacent arc-shaped shield tunnel segments 1, thereby achieving a circumferential equal stiffness connection of the arc-shaped shield tunnel segments 1.

[0040] Furthermore, the end cap 7 is fixed to the circumferential connecting end face of the arc-shaped shield tunnel segment 1 by welding.

[0041] Furthermore, the complete meshing part located on the outer or inner side matches the meshing structure of the outer fastener 4 or the inner fastener 5, that is, the complete meshing part formed by each pair of adjacent and closely fitted polygonal steel embedded parts 3 can contact and cooperate with the meshing structure of the outer fastener 4 or the inner fastener 5 to ensure that the arc-shaped shield tunnel segment 1 is securely fastened during connection.

[0042] Furthermore, the installation direction of the locking bolt 6 is perpendicular to the circumferential plane of the arc-shaped shield segment 1, that is, the installation direction of the locking bolt 6 is along the thickness direction of the arc-shaped shield segment 1.

[0043] Furthermore, the mating surface of the end sealing plate 7 is provided with a concave positioning hole, and after adjacent end sealing plates 7 are mated, a complete waist-shaped positioning hole is formed for the locking bolt 6 to pass through.

[0044] It is understood that for each of the end sealing plates 7, the number of the concave positioning holes is the same as the number of the locking bolts 6, and the same as the number of the polygonal steel embedded parts 3 arranged along the axial direction, and they are all set in a one-to-one correspondence.

[0045] Furthermore, the outer fastener 4 is provided with a threaded groove, and the inner fastener 5 is provided with a through hole; during installation, the locking bolt 6 can pass through the through hole of the inner fastener 5 and through the concave positioning hole of the end sealing plate 7, and finally screw into the threaded groove of the outer fastener 4 to achieve a mating connection.

[0046] Furthermore, step S4 specifically includes:

[0047] S41. Two tool bolts 61 are used to pre-position any two adjacent sets of polygonal prism steel embedded parts 3 through the penetration. It should be noted that the pre-positioning is achieved by inserting the tool bolts 61 into the through holes of the inner fastener 5, and then through the concave positioning holes of the end sealing plate 7, and finally forming a threaded connection with the threaded groove of the outer fastener 4. In this pre-positioning operation, the tool bolts 61 are only screwed into the threaded groove to a certain depth without being tightened.

[0048] S42. Install locking bolts 6 on the remaining groups of multi-faceted prism steel embedded parts 3 and apply torque;

[0049] S43. After all the circumferential connection nodes have been tightened, remove the two tool bolts 61 and replace them with locking bolts 6 and tighten them.

[0050] It should be noted that, in the preferred embodiment of the present invention, the tool bolt 61 may be a continuous threaded rod structure, the length of which is greater than that of the locking bolt 6, so as to facilitate tightening to complete the pre-positioning operation; in special cases, if the tool bolt 61 is missing, the locking bolt 6 may be used as a substitute, and in this case, the corresponding locking bolt 6 in step S43 does not need to be removed and can be tightened directly.

[0051] It is worth noting that when installing several arc-shaped shield tunnel segments 1 sequentially up to the last segment (i.e., the capping block) of the complete ring structure, due to the small circumferential gap, it is necessary to install the last segment with staggered joints. For details, please refer to [link to relevant documentation]. Figure 3 The process includes the following steps: First, align the outer fastener 4 with the adjacent installed curved shield tunnel segment 1 at the polyhedral steel embedded part 3, temporarily fix the outer fastener 4 with the tool bolt 61, then push the last segment until its polyhedral steel embedded part 3 and the outer fastener 4 are embedded and engaged, then install the inner fastener 5, replace the tool screw 61 with the locking bolt 6 and tighten it.

[0052] Furthermore, during the assembly of the complete ring structure, all the arc-shaped shield tunnel segments 1 are of the same size. That is, when the arc-shaped shield tunnel segments 1 are assembled circumferentially to form the complete ring structure, an evenly distributed assembly method is adopted to further ensure the uniform stiffness of the complete ring structure. In this invention, the complete ring structure is typically formed by 6 or 8 arc-shaped shield tunnel segments 1 of the same size being assembled circumferentially.

[0053] Furthermore, the present invention also includes a process step of longitudinally assembling the arc-shaped shield tunnel segment 1 along the tunnel axis; wherein, in step S2 of the present invention, if the currently installed arc-shaped shield tunnel segment 1 is not the arc-shaped shield tunnel segment 1 in the first ring structure, it further includes a step of longitudinally assembling the arc-shaped shield tunnel segment 1 onto the previous ring structure. Specifically, taking the next ring structure as the second ring structure as an example, when assembling the second ring structure, the first arc-shaped shield tunnel segment 1 in the second ring structure is first longitudinally connected to the corresponding arc-shaped shield tunnel segment 1 on the first ring structure. Then, the adjacent second arc-shaped shield tunnel segment 1 is first longitudinally connected to the first ring structure, and then circumferentially connected and fastened to the adjacent first arc-shaped shield tunnel segment 1. This process is repeated, thus completing not only the circumferential assembly of the second ring structure, but also the longitudinal assembly of the first and second ring structures.

[0054] Furthermore, before the construction of the arc-shaped shield tunnel segment 1, the contact surfaces of the polygonal prism steel embedded part 3, the outer fastener 4, the inner fastener 5, and the locking bolt 6 are coated with waterproof material, which can play a lubricating role in the early stage of construction, facilitate the assembly and construction of the arc-shaped shield tunnel segment 1, and seal the gaps after assembly to prevent water leakage from the joints; wherein, the waterproof material can be a low-consistency slow-setting single-component polyurethane adhesive.

[0055] In summary, this invention proposes an assembly method for circumferentially stiff shield tunnel segments. Through the meshing and engagement of the polyhedral steel embedded parts and fasteners, and the control of equivalent preload, it ensures uniform distribution of circumferential stress, eliminates stress concentration in traditional bolt or single-point socket structures, and significantly improves the overall stiffness of the shield tunnel segment ring. This saves costs and greatly extends the service life of the shield tunnel segments, demonstrating significant practicality. Furthermore, this invention uses several locking bolts to lock the inner and outer polyhedral steel embedded parts in the normal (radial) direction (providing a normal secondary force on the order of N), effectively connecting the inner and outer main reinforcing bars of adjacent arc-shaped shield tunnel segments (transmitting a radial primary force on the order of kN), preventing joint opening, and exhibiting extremely strong stability and fastening effect.

[0056] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A method for assembling circumferentially stiff shield tunnel segments, characterized in that, The process of assembling multiple arc-shaped shield tunnel segments circumferentially to form a closed ring structure includes the following steps: S1. During the prefabrication stage, end sealing plates are fixedly installed on the circumferential connection end face of each arc-shaped shield tunnel segment, and multiple polygonal prism steel embedded parts are installed at the intersection nodes of the inner and outer main reinforcements of each arc-shaped shield tunnel segment. After being formed by concrete pouring, they are transported to the assembly site. S2. Connect two adjacent arc-shaped shield tunnel segments circumferentially, so that the mating surfaces of the end sealing plates fit together, and make the outer polygonal steel embedded parts on the two adjacent arc-shaped shield tunnel segments fit together one by one, and the inner polygonal steel embedded parts fit together one by one. S3. Install an outer fastener with an interlocking structure at each pair of the polygonal prism steel embedded parts located on the outer side, and install an inner fastener with an interlocking structure at each pair of the polygonal prism steel embedded parts located on the inner side. S4. The corresponding number of locking bolts pass through the inner fastener and the end sealing plate in sequence and are connected to the outer fastener. A torque is applied so that the outer fastener and the inner fastener respectively form a pressing fit with the corresponding meshing surface of the polygonal steel embedded part. S5. By using uniform torque to generate an equivalent preload through the squeezing fit of each connection node, a uniform and continuous stress distribution is formed in the circumferential direction between adjacent arc-shaped shield tunnel segments. Each of the aforementioned polyhedral steel embedded parts has a meshing surface; and the meshing surface of the inner polyhedral steel embedded part faces the center of the entire ring structure, while the meshing surface of the outer polyhedral steel embedded part faces a direction away from the center of the entire ring structure.

2. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 1, characterized in that, On each arc-shaped shield tunnel segment, the polyhedral steel embedded parts are arranged at equal intervals along the axial direction of the arc-shaped shield tunnel segment, and are symmetrically arranged on the outer and inner sides. After two adjacent arc-shaped shield tunnel segments are joined together in the circumferential direction, two polygonal steel embedded parts that are adjacent to each other on the outer and inner sides form a pair, and the two meshing surfaces of each pair of polygonal steel embedded parts form a complete meshing part after they are adjacent. Among them, the complete meshing parts of each pair of polyhedral steel embedded parts on the outer side are meshed with each outer fastener, and the complete meshing parts of each pair of polyhedral steel embedded parts on the inner side are meshed with each inner fastener.

3. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 2, characterized in that, After two adjacent arc-shaped shield tunnel segments are joined together circumferentially, two pairs of polygonal prism-shaped steel embedded parts symmetrically set on the outer and inner sides form a set; Among them, multiple sets of polyhedral steel embedded parts are arranged at intervals along the axial direction of the arc-shaped shield tunnel segments, and each set is connected and installed using a locking bolt.

4. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 3, characterized in that, The mating surface of the end sealing plate is provided with a concave positioning hole, and after adjacent end sealing plates are mated, a complete waist-shaped positioning hole is formed for the locking bolt to pass through. For each end cap plate, the number of concave positioning holes is the same as the number of locking bolts, and the number of axially arranged polygonal prism steel embedded parts is also the same, with each hole corresponding to the other.

5. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 4, characterized in that, The outer fastener has a threaded groove, and the inner fastener has a through hole. During assembly, the locking bolt can pass through the through hole of the inner fastener and through the concave positioning hole of the end sealing plate, and finally screw into the threaded groove of the outer fastener.

6. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 3, characterized in that, In step S2, if the currently installed arc-shaped shield tunnel segment is not an arc-shaped shield tunnel segment in the first ring structure, the step further includes longitudinally assembling the arc-shaped shield tunnel segment onto the previous ring structure.

7. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 6, characterized in that, step S4 specifically includes: S41. Use two tool bolts to pre-position any two adjacent sets of polyhedral steel embedded parts through the penetration; S42. Install locking bolts on the remaining groups of multi-faceted prism steel embedded parts and apply torque; S43. After all the circumferential connection nodes have been tightened, remove the two tool bolts and replace them with locking bolts and tighten them. The tool bolt is a continuous threaded rod, and its effective thread length is greater than that of the locking bolt.

8. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 7, characterized in that, When installing several arc-shaped shield tunnel segments sequentially to the last segment of the complete ring structure, the last segment needs to be installed with staggered joints. The specific steps include: first, aligning the outer fastener with the polygonal prism steel embedded part of the adjacent installed arc-shaped shield tunnel segment, temporarily fixing the outer fastener with a tool bolt, then pushing the last segment until its polygonal prism steel embedded part and the outer fastener are embedded and engaged, then installing the inner fastener, replacing the tool screw with a locking bolt and tightening it.

9. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 1, characterized in that, When the arc-shaped shield tunnel segments are assembled in a circumferential manner to form a complete ring structure, arc-shaped shield tunnel segments of the same size are spliced ​​together to form a uniform assembly.

10. The assembly method for circumferentially uniform stiffness shield tunnel segments as described in claim 1, characterized in that, The contact surfaces of the polygonal prism steel embedded part, the outer fastener, the inner fastener, and the locking bolt are all coated with waterproof material.

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