Method for assembling circumferential equal-rigidity shield segments

Abstract

The invention relates to an assembling method of annular equal-rigidity shield segments, which comprises the following steps: arranging an end sealing plate and a plurality of polygon prism type steel embedded parts on arc-shaped shield segments during prefabrication, and installing an outer side fastener and an inner side fastener which are provided with meshing structures when two adjacent arc-shaped shield segments are butted along the annular direction, so that the annular equal-rigidity shield segments are assembled; and locking is conducted through corresponding locking bolts, and finally the purpose that the multiple arc-shaped shield segments are spliced in the annular direction to form a closed whole-ring structure is achieved. The adjacent arc-shaped shield segments can form uniform and continuous stress distribution in the circumferential direction, circumferential equal-rigidity connection of the arc-shaped shield segments is achieved, the overall rigidity of the shield segment ring is greatly improved, and the service life of the shield segments is greatly prolonged while the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield segment assembly, and particularly relates to an assembly method for circumferentially equal-rigidity shield segments. Background Art

[0002] As the core process of tunnel construction, the circumferential assembly of shield segments directly determines the overall mechanical properties of the tunnel structure, long-term operation safety, and groundwater leakage risk.

[0003] With the diversification of shield tunnel segment connection structures, in recent years, there have been diverse innovations in shield segment connection technologies. Reinforced concrete precast shield segments, as the core components of underground traffic infrastructure construction, have been widely used due to their industrial production advantages, construction efficiency, and environmental friendliness. However, there are still significant technical bottlenecks in the field of shield segment connection technologies: First, the "circular multi-hinge" mechanical model formed by traditional single-row bolt connections results in weak overall stiffness of the structure, which is prone to centimeter-level displacements during construction in soft strata, thus inducing major safety hazards such as water leakage at the shield segment joints and concrete cracking. Second, limited by the structural characteristics of precast assembly structures, when there is a lack of construction space on the outside of the shield segments, the existing connection technologies are difficult to achieve reliable connection of the main reinforcement bars on the inside and outside, resulting in discontinuous force transmission paths and seriously affecting the overall mechanical properties of the tunnel structure.

[0004] Based on this, an assembly method for circumferentially equal-rigidity shield segments that can overcome the above defects is proposed to address the above problems.

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

[0006] The object of the present invention is to provide an assembly method for circumferentially equal-rigidity shield segments, which ensures uniform distribution of circumferential stress through the meshing cooperation of multi-prism-shaped steel embedded parts and fasteners and the control of equivalent pre-tightening force.

[0007] To achieve the above object, the present invention provides a method for assembling circumferentially equal-stiffness shield segments. A closed integral ring structure is formed by assembling multiple arc-shaped shield segments circumferentially, and the method includes the following steps: S1. In the prefabrication stage, end seal plates are fixedly arranged on the circumferential connection end faces of each arc-shaped shield segment, and multiple multi-prismatic steel embedded parts are arranged at the intersection nodes of the main reinforcement bars on the inner and outer sides of each arc-shaped shield segment. After being formed by concrete pouring, they are transported to the assembly site; S2. Adjacent two arc-shaped shield segments are butted circumferentially, so that the butting surfaces of the end seal plates are mutually attached, and the multi-prismatic steel embedded parts on the outer sides of the adjacent two arc-shaped shield segments are attached to each other one by one, and the multi-prismatic steel embedded parts on the inner sides are attached to each other one by one; S3. On each pair of the multi-prismatic steel embedded parts located on the outer side, outer fasteners with meshing structures are correspondingly installed, and on each pair of the multi-prismatic steel embedded parts located on the inner side, inner fasteners with meshing structures are correspondingly installed; S4. Through the corresponding number of locking bolts, they sequentially penetrate through the inner fasteners and the end seal plates, and are connected to the outer fasteners, and torque is applied to make the outer fasteners and the inner fasteners respectively form extrusion fits with the corresponding meshing surfaces of the multi-prismatic steel embedded parts; S5. Through uniform torque, the extrusion fits of each connection node generate equivalent pre-tightening forces, so that adjacent arc-shaped shield segments form a uniform and continuous stress distribution circumferentially.

[0008] Wherein, each of the multi-prismatic steel embedded parts has a meshing surface; and the meshing surface of the multi-prismatic steel embedded part located on the inner side faces the center of the integral ring structure, and the meshing surface of the multi-prismatic steel embedded part located on the outer side faces away from the center of the integral ring structure.

[0009] Preferably, on each arc-shaped shield segment, the multi-prismatic steel embedded parts are arranged at equal intervals along the axial direction of the arc-shaped shield segment, and are symmetrically arranged on the outer side and the inner side; after adjacent two arc-shaped shield segments are butted circumferentially, two multi-prismatic steel embedded parts that are adjacent to each other one by one on the outer side and the inner side form a pair, and the two meshing surfaces of each pair of multi-prismatic steel embedded parts form a complete meshing part after being adjacent; wherein, the complete meshing parts of each pair of multi-prismatic steel embedded parts located on the outer side are respectively meshed and connected with each outer fastener, and the complete meshing parts of each pair of multi-prismatic steel embedded parts located on the inner side are respectively meshed and connected with each inner fastener.

[0010] Preferably, after adjacent two arc-shaped shield segments are butted circumferentially, two pairs of multi-prismatic steel embedded parts that are symmetrically arranged on the outer side and the inner side form a group; wherein, multiple groups of multi-prismatic steel embedded parts are arranged at intervals along the axial direction of the arc-shaped shield segment, and each group is connected and installed by one locking bolt.

[0011] Preferably, concave positioning holes are provided on the docking surfaces of the end sealing plates, and a complete waist-shaped positioning hole is formed after the adjacent end sealing plates are docked for the locking bolts to pass through; for each end sealing plate, the number of the concave positioning holes provided thereon is the same as the number of the locking bolts and the same as the number of the polygonal prism steel embedded parts arranged along the axis, and they are arranged in one-to-one correspondence.

[0012] Preferably, a threaded groove is provided inside the outer fastener, and a through hole is provided inside the inner fastener; during installation, 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 be screwed into the threaded groove of the outer fastener.

[0013] Preferably, in step S2, if the currently installed arc-shaped shield segment is not the arc-shaped shield segment in the first ring integral structure, the step of longitudinally assembling the arc-shaped shield segment to the previous ring integral structure first is further included.

[0014] Preferably, step S4 specifically includes: S41, pre-positioning any adjacent two groups of polygonal prism steel embedded parts by passing through them with two tool bolts; S42, installing locking bolts on the remaining groups of polygonal prism steel embedded parts and applying torque; S43, after the circumferential connection nodes are tightened, removing the two tool bolts and replacing them with locking bolts and tightening them; wherein, the tool bolts are full-length screw rods, and the effective thread length thereof is greater than that of the locking bolts.

[0015] Preferably, when installing several arc-shaped shield segments in sequence to the last segment of the integral structure, the last segment needs to be installed with staggered joints, which specifically includes the following steps: first align the outer fastener with the polygonal prism steel embedded part of the adjacent installed arc-shaped shield segment, temporarily fix the outer fastener with a tool bolt, then push the last segment until its polygonal prism steel embedded part is embedded and meshed with the outer fastener, and then install the inner fastener, replace the tool screw rod with a locking bolt and tighten it.

[0016] Preferably, when the arc-shaped shield segments are assembled circumferentially to form an integral structure, arc-shaped shield segments of the same size are used for splicing to form a uniform assembly.

[0017] Preferably, waterproof materials are coated on the contact surfaces of the polygonal prism steel embedded parts, the outer fasteners, the inner fasteners and the locking bolts.

[0018] In summary, compared with the prior art, the assembling method of the circumferentially equal-rigidity shield segments of the present invention has at least the following advantages:

[0019] (1) Through the meshing and cooperation of the multi-prismatic steel embedded parts and fasteners and the control of equivalent pre-tightening force, the present invention ensures the uniform distribution of circumferential stress, eliminates the stress concentration of traditional bolt or single-point socket structure, greatly improves the overall stiffness of the shield segment ring, saves costs while greatly extending the service life of the shield segment, and has great practicality;

[0020] (2) Through a number of locking bolts, in the normal direction, a normal secondary force of N magnitude is provided to lock the multi-prismatic steel embedded parts on the inner and outer sides, enabling the main steel bars on the inner and outer sides of adjacent arc-shaped shield segments to transfer a radial primary force of kN magnitude for effective connection and preventing the joint from opening, with extremely strong stability and fastening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the shield segment connection structure in the present invention;

[0022] Figure 2 It is a schematic diagram of the cooperation between the multi-prismatic steel embedded part and the fastener of the shield segment in the present invention;

[0023] Figure 3 It is a schematic diagram of the staggered joint installation of the last shield segment in the present invention.

[0024] Description of the reference numerals:

[0025] 1 - arc-shaped shield segment, 2 - main steel bar, 3 - multi-prismatic steel embedded part, 4 - outer fastener, 5 - inner fastener, 6 - locking bolt, 61 - tool bolt, 7 - end sealing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following Figure 1 ~ Figure 3 , by elaborating in detail a preferred specific embodiment, further elaborates on the present invention.

[0027] It should be noted that the drawings are in a very simplified form and all use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention, not for limiting the limiting conditions for implementing the present invention, so they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the efficacy that the present invention can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed by the present invention.

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

[0029] In the present invention, the arc-shaped shield segment 1 is an arc-shaped precast concrete member. By assembling multiple arc-shaped shield segments 1 circumferentially, a closed integral ring structure can be formed, and a series of consecutive integral ring structures are longitudinally connected along the tunnel axis to form a tunnel lining system. Among them, the first integral ring structure refers to the first integral ring formed by assembling multiple arc-shaped shield segments 1 at the starting section of tunnel construction, and the subsequent assembled integral rings are collectively referred to as the next integral ring structure.

[0030] As Figure 1 and Figure 2 shown, the present invention provides an assembling method for circumferentially equal-stiffness shield segments, comprising the following steps:

[0031] S1. Prefabrication stage: fixedly arrange end sealing plates 7 on the circumferential connection end faces of each arc-shaped shield segment 1, and arrange a plurality of polygonal prism-shaped steel embedded parts 3 at the intersection nodes of each inner and outer main reinforcement bars 2 of each arc-shaped shield segment 1. After concrete pouring and forming, it is transported to the assembly site;

[0032] Among them, for each arc-shaped shield segment 1, it is divided into two side faces, an outer side and an inner side, in the thickness direction. The outer side refers to the outer arc surface of the arc-shaped shield segment 1, which is also the outer arc surface of the integral ring structure formed after splicing. The inner side refers to the inner arc surface of the arc-shaped shield segment 1, which is also the inner arc surface of the integral ring structure formed after splicing. On the outer side, a plurality of outer main reinforcement bars 2 are evenly spaced along the axial direction of the arc-shaped shield segment 1. On the inner side, a plurality of inner main reinforcement bars 2 are evenly spaced along the axial direction of the arc-shaped shield segment 1. It can be understood that the outer and inner main reinforcement bars 2 are symmetrically arranged structures, and a polygonal prism-shaped steel embedded part 3 is arranged at each intersection node of each inner and outer main reinforcement bar 2. Therefore, on each arc-shaped shield segment 1, the polygonal prism-shaped steel embedded parts 3 are arranged at equal intervals along the axial direction of the arc-shaped shield segment 1 and are symmetrically arranged on the outer and inner sides of the arc-shaped shield segment 1;

[0033] Each of the polygonal prism steel embedded parts 3 has a meshing surface on which multi-stage meshing teeth are arranged; and the meshing surface of the polygonal prism steel embedded part 3 located on the inner side faces the center of the entire ring structure, and the meshing surface of the polygonal prism steel embedded part 3 located on the outer side faces away from the center of the entire ring structure;

[0034] S2. Butt-join two adjacent curved shield segments 1 in the circumferential direction, so that the butt-jointed surfaces of the end sealing plates 7 are in contact with each other, and the outer polygonal columnar steel embedded parts 3 of the two adjacent curved shield segments 1 are adjacent to each other in a one-to-one correspondence, and the inner polygonal columnar steel embedded parts 3 are adjacent to each other in a one-to-one correspondence;

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

[0036] It can be understood that after two adjacent curved shield segments 1 are butted together in the circumferential direction, the two polygonal columnar steel embedded parts 3 on the outer side and the inner side corresponding to each other one by one constitute a pair of polygonal columnar steel embedded parts 3. Obviously, the two meshing surfaces of each pair of polygonal columnar steel embedded parts 3 will form a complete meshing portion after abutment; wherein, the complete meshing portion of each pair of polygonal columnar steel embedded parts 3 located on the outer side is used to respectively realize meshing connection with each outer fastener 4, and the complete meshing portion of each pair of polygonal columnar steel embedded parts 3 located on the inner side is used to respectively realize meshing connection with each inner fastener 5;

[0037] S4. Pass a corresponding number of locking bolts 6 through the inner fastener 5 and the end sealing plate 7 in sequence and connect them to the outer fastener 4. Apply torque so that the outer fastener 4 and the inner fastener 5 respectively form an extrusion fit with the corresponding mating surfaces of the polygonal steel embedded part 3;

[0038] It can be understood that after two adjacent curved shield segments 1 are butt-jointed in the circumferential direction, the two pairs of polygonal columnar steel embedded parts 3 symmetrically arranged on the outer and inner sides constitute a group. Therefore, multiple groups of polygonal columnar steel embedded parts 3 are arranged at intervals along the axial direction of the curved shield segment 1, and each group is installed using a locking bolt 6.

[0039] S5. Through uniform torque, the extrusion fit of each connection node generates equal preload force, so that adjacent arc shield segments 1 form a uniform and continuous stress distribution in the circumferential direction, and realize the circumferential equal stiffness connection of the arc shield segments 1.

[0040] Furthermore, the end sealing plate 7 is fixed to the circumferential connecting end surface of the arc-shaped shield segment 1 by welding.

[0041] Further, the complete engagement portions located on the outer side or the inner side are matched with the engagement structures of the outer fastener 4 or the inner fastener 5, that is, the complete engagement portions formed by each pair of the adjacent and abutted polygonal prism steel embedded parts 3 can be in contact and cooperation with the engagement structures of the outer fastener 4 or the inner fastener 5 to ensure the reliable fastening when the arc-shaped shield segments 1 are connected.

[0042] Further, 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] Further, concave positioning holes are provided on the butting surfaces of the end sealing plates 7, and a complete waist-shaped positioning hole is formed after the adjacent end sealing plates 7 are butted for the locking bolt 6 to penetrate through.

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

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

[0046] Further, the step S4 specifically includes:

[0047] S41. Use two tool bolts 61 to perform through pre-positioning on any two adjacent groups of polygonal prism steel embedded parts 3; it should be noted that the implementation method of the through pre-positioning is: pass the tool bolts 61 through the through holes of the inner fasteners 5, then through the concave positioning holes of the end sealing plates 7, and finally form a threaded mating connection with the threaded grooves of the outer fasteners 4, wherein in this pre-positioning operation, the tool bolts 61 are only screwed into the threaded grooves for a partial depth without being tightened.

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

[0049] S43. After the circumferential connection nodes are 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 can be selected as a full-length screw structure, and its length is greater than that of the locking bolt 6, which is convenient for screwing to complete the pre-positioning operation; in special cases, if the tool bolt 61 is missing, it is allowed to use the locking bolt 6 for replacement. In this case, the corresponding locking bolt 6 in step S43 does not need to be removed and can be directly tightened.

[0051] It should be noted that when installing several arc-shaped shield segments 1 in sequence to the last segment (i.e., the closure segment) of the integral ring structure, due to the too small circumferential gap, the last segment needs to be installed with staggered joints. Specifically, please refer to Figure 3 , which includes the following steps: first, align the outer fastener 4 with the polygonal steel embedded part 3 of the adjacent installed arc-shaped shield segment 1, temporarily fix the outer fastener 4 through the tool bolt 61, then push the last segment until its polygonal steel embedded part 3 is embedded with the outer fastener 4 and forms an engagement, and then install the inner fastener 5, replace the tool screw 61 with the locking bolt 6 and tighten it.

[0052] Furthermore, when assembling the integral ring structure, the sizes of all arc-shaped shield segments 1 are the same, that is, when the arc-shaped shield segments 1 are assembled in the circumferential direction to form the integral ring structure, an equal-division assembly method is adopted to further ensure the equal stiffness of the integral ring structure. In the present invention, the integral ring structure is usually formed by circumferentially assembling 6 or 8 arc-shaped shield segments 1 with the same size.

[0053] Furthermore, the present invention also includes the process steps of longitudinally assembling the arc-shaped shield segments 1 along the tunnel axis; among them, in step S2 of the present invention, if the currently installed arc-shaped shield segment 1 is not the arc-shaped shield segment 1 in the first integral ring structure, it also includes the step of first longitudinally assembling the arc-shaped shield segment 1 onto the previous integral ring structure. Specifically, taking the next integral ring structure as the second integral ring structure as an example, when assembling the second integral ring structure, first longitudinally connect the first arc-shaped shield segment 1 in the second integral ring structure to the corresponding arc-shaped shield segment 1 on the first integral ring structure, and then longitudinally connect the adjacent second arc-shaped shield segment 1 to the first integral ring structure first, and then circumferentially connect and fasten it to the adjacent first arc-shaped shield segment 1, and so on, not only completing the circumferential assembly of the second integral ring structure, but also completing the longitudinal assembly of the first integral ring structure and the second integral ring structure at the same time.

[0054] Furthermore, before the construction of the arc-shaped shield segment 1, waterproof materials are coated on the contact surfaces of the polygonal steel embedded part 3, the outer fastener 4, the inner fastener 5 and the locking bolt 6, which can play a lubricating role in the initial stage of construction, facilitate the assembly construction of the arc-shaped shield segment 1, and can seal the gaps after the assembly is completed to prevent leakage of joints; among them, the waterproof material can adopt a low-consistency retarding one-component polyurethane glue.

[0055] In summary, the present invention proposes an assembling method for circumferentially equal-stiffness shield segments, which can ensure uniform distribution of circumferential stress through the meshing and cooperation of multi-prismatic steel embedded parts and fasteners and the control of equivalent pre-tightening force, eliminate stress concentration of traditional bolts or single-point socket structures, greatly improve the overall stiffness of the shield segment ring, save costs, and greatly extend the service life of the shield segment, with great practicality. At the same time, the present invention locks the inner and outer multi-prismatic steel embedded parts in the normal (radial) direction through a number of locking bolts (providing a normal secondary force of N magnitude), effectively connecting the inner and outer main steel bars (transmitting a radial primary force of kN magnitude) of adjacent arc-shaped shield segments, preventing the joint from opening, and having extremely strong stability and fastening effect.

[0056] Although the content of the present invention has been introduced in detail through the above preferred embodiments, it should be recognized that the above description should not be regarded as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and substitutions to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. A method for assembling circumferentially equal-stiffness shield segments, characterized in that, A closed integral ring structure is formed by circumferentially assembling multiple arc-shaped shield segments, which includes the following steps: S1. In the prefabrication stage, end sealing plates are fixedly arranged on the circumferential connection end faces of each arc-shaped shield segment, and multiple multi-prismatic steel embedded parts are arranged at the intersection nodes of the main reinforcement bars on the inner and outer sides of each arc-shaped shield segment. After being formed by concrete pouring, they are transported to the assembly site; S2. Adjacent two arc-shaped shield segments are butted circumferentially, so that the butting surfaces of the end sealing plates are mutually attached, and the multi-prismatic steel embedded parts on the outer sides of the adjacent two arc-shaped shield segments are attached to each other one by one, and the multi-prismatic steel embedded parts on the inner sides are attached to each other one by one; S3. Outer fasteners with meshing structures are correspondingly installed at each pair of the multi-prismatic steel embedded parts on the outer side, and inner fasteners with meshing structures are correspondingly installed at each pair of the multi-prismatic steel embedded parts on the inner side; S4. The corresponding number of locking bolts sequentially penetrate through the inner fasteners and the end sealing plates, and are connected to the outer fasteners, and torque is applied to make the outer fasteners and the inner fasteners respectively form extrusion fits with the corresponding meshing surfaces of the multi-prismatic steel embedded parts; S5. By applying uniform torque, the extrusion fits at each connection node generate equal pre-tightening forces, so that the adjacent arc-shaped shield segments form a uniform and continuous stress distribution circumferentially; Wherein, each multi-prismatic steel embedded part has a meshing surface; and the meshing surface of the multi-prismatic steel embedded part on the inner side faces the center of the integral ring structure, and the meshing surface of the multi-prismatic steel embedded part on the outer side faces away from the center of the integral ring structure.

2. The assembling method of the circumferential equal-stiffness shield segment according to claim 1, characterized in that, On each arc-shaped shield segment, the multi-prismatic steel embedded parts are arranged at equal intervals along the axial direction of the arc-shaped shield segment, and are symmetrically arranged on the outer side and the inner side; After adjacent two arc-shaped shield segments are butted circumferentially, two multi-prismatic steel embedded parts adjacent to each other on the outer side and the inner side form a pair, and the two meshing surfaces of each pair of multi-prismatic steel embedded parts form a complete meshing part after adjacency; Wherein, the complete meshing parts of each pair of multi-prismatic steel embedded parts on the outer side are respectively meshed and connected with the respective outer fasteners, and the complete meshing parts of each pair of multi-prismatic steel embedded parts on the inner side are respectively meshed and connected with the respective inner fasteners.

3. The assembling method of the circumferential equal stiffness shield segment according to claim 2, characterized in that After adjacent two arc-shaped shield segments are butted circumferentially, two pairs of multi-prismatic steel embedded parts symmetrically arranged on the outer side and the inner side form a group; Wherein, multiple groups of multi-prismatic steel embedded parts are arranged at intervals along the axial direction of the arc-shaped shield segment, and each group is connected and installed by a locking bolt.

4. The assembling method of the circumferential equal stiffness shield segment according to claim 3, characterized in that, Concave positioning holes are arranged on the butting surfaces of the end sealing plates, and a complete kidney-shaped positioning hole is formed after the adjacent end sealing plates are butted, for the locking bolt to penetrate through; For each end sealing plate, the number of the concave positioning holes arranged thereon is the same as the number of the locking bolts, and is the same as the number of the multi-prismatic steel embedded parts arranged along the axial direction, and they are all arranged in one-to-one correspondence.

5. The assembling method of the circumferential equal-stiffness shield segment according to claim 4, wherein, Threaded grooves are arranged inside the outer fasteners, and through holes are arranged inside the inner fasteners; during assembly, the locking bolts can pass through the through holes of the inner fasteners, and pass through the concave positioning holes of the end sealing plates, and finally be screwed into the threaded grooves of the outer fasteners.

6. The assembling method of the circumferential equal-stiffness shield segment according to claim 3, characterized in that, In step S2, if the currently installed arc-shaped shield segment is not the arc-shaped shield segment in the first full-ring structure, it further includes the step of longitudinally assembling the arc-shaped shield segment onto the previous full-ring structure first.

7. The assembling method of the circumferential equal stiffness shield segment according to claim 6, characterized in that, Step S4 specifically includes: S41. Penetrate and pre-position any two adjacent groups of polygonal prism-shaped steel embedded parts with two tool bolts; S42. Install locking bolts on the remaining groups of polygonal prism-shaped steel embedded parts and apply torque; S43. After the circumferential connection nodes are tightened, remove the two tool bolts and replace them with locking bolts and tighten them; Among them, the tool bolt is a full-length screw rod, and its effective thread length is greater than that of the locking bolt.

8. The assembling method of the circumferential equal stiffness shield segment according to claim 7, characterized in that, When sequentially installing several arc-shaped shield segments onto the last segment of the full-ring structure, the last segment needs to be installed with staggered joints, which specifically includes the following steps: First, align the outer fastener with the polygonal prism-shaped steel embedded part of the adjacent installed arc-shaped shield segment, temporarily fix the outer fastener with a tool bolt, then push the last segment until its polygonal prism-shaped steel embedded part is embedded and meshed with the outer fastener, and then install the inner fastener, replace the tool screw rod with a locking bolt and tighten it.

9. The assembling method of the circumferential equal stiffness shield segment according to claim 1, characterized in that When the arc-shaped shield segments are assembled circumferentially to form a full-ring structure, arc-shaped shield segments of the same size are spliced to form a uniform assembly.

10. The assembling method of the circumferential equal-stiffness shield segment according to claim 1, wherein, Waterproof materials are coated on the contact surfaces of the polygonal prism-shaped steel embedded parts, the outer fasteners, the inner fasteners, and the locking bolts.

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