A shield assembled segment positioning bearing structure and its design method

Abstract

The present invention relates to the technical field of shield-assembled segment lining, and in particular to a shield-assembled segment positioning and bearing structure, including a positioning tenon and a tenon groove penetrating the segment joint surface, the positioning tenon including a cylindrical sleeve, truncated cone sleeves symmetrically arranged at both ends of the cylindrical sleeve in the axial direction, the cylindrical sleeve and the truncated cone sleeve being integrally formed, a reinforcing rib structure being arranged in the segment corresponding to the tenon groove, and the reinforcing rib structure being symmetrically arranged relative to the positioning tenon in the use state. By combining the structural characteristics of the actual shear failure zone of the segment, a reinforcing rib structure is arranged in the segment perpendicular to the fracture surface, and a positioning tenon and a reinforcing rib structure of a specific structure are combined, so as to improve the shear resistance of the shield-assembled segment positioning and bearing structure, and avoid the segment from losing its bearing capacity due to premature failure caused by stress concentration. At the same time, a cylindrical sleeve is adopted in the middle of the positioning tenon, so as to avoid a slight displacement of the positioning tenon and a significant change in its effective thickness.

Description

Technical Field

[0001] The present invention relates to the technical field of shield - assembled segment linings, and particularly relates to a positioning and bearing structure for shield - assembled segments and its design method. Background Art

[0002] Shield segments are the main assembled components in shield construction. They are the innermost barrier of the tunnel, bearing the functions of resisting soil pressure, groundwater pressure, and some special loads. Shield segments are the permanent lining structure of shield - method tunnels. The quality of shield segments is directly related to the overall quality and safety of the tunnel, affecting the waterproof performance and durability of the tunnel. Existing shield segments adopt an assembled structure. To facilitate the positioning of shield segments during assembly and improve the shear resistance of the assembly joints during operation, tenon grooves are usually set at the bolt holes on the segment joint surface. The segment joint surface is the splicing surface of adjacent segments in the tunnel circumferential direction or the splicing surface of adjacent segments in the tunnel longitudinal direction. When assembling segments, a positioning tenon is set in the tenon groove of the first - installed segment. A connecting bolt with curvature for connecting two adjacent segments passes through the positioning tenon and then connects with the bolt hole. The later - installed segment is positioned and installed through the positioning tenon. Then, a torque wrench is used to first tighten the connecting bolts between adjacent segments in the circumferential direction and then tighten the connecting bolts between adjacent segments in the tunnel longitudinal direction to fix the segments. The connecting bolt, positioning tenon, and tenon groove together form a positioning and bearing structure.

[0003] However, in actual use, it is found that the size of the positioning tenon does not match the size of the tenon groove. Considering the production errors of each component of the segment, the internal space of the tenon groove is prepared to be larger than the volume of the positioning tenon. After the positioning tenon is installed in the tenon groove, there will still be gaps around the positioning tenon, resulting in the easy dislocation of the positioning tenon. When the external load is large, the positioning tenon is prone to excessive local stress, accelerating its damage. This will not only reduce the utilization degree of the bearing capacity of the positioning tenon but also pose a safety hazard. At the same time, due to the dislocation of the positioning tenon, the positioning tenon continuously moves relative to the inner wall of the tenon groove. Due to the cross - section weakening effect of the tenon hole and the fact that the stiffness of the positioning tenon is greater than that of the segment concrete, the segment is prone to stress concentration and cracking near the tenon groove, and the cracks generally spread in a V - shape, affecting the bearing capacity of the segment.

[0004] Therefore, there is an urgent need for a technical solution to solve the technical problem that the sizes of the positioning tenon and tenon groove of the existing shield - assembled segments do not match, and it is easy to cause stress concentration and premature failure due to the relative dislocation of the positioning tenon and tenon groove, affecting the bearing capacity of the segment. Summary of the Invention

[0005] The purpose of the present invention is to provide a positioning and bearing structure for shield - assembled segments and its design method for the technical problem that the sizes of the positioning tenon and tenon groove of the existing shield - assembled segments do not match, and it is easy to cause stress concentration and premature failure due to the relative dislocation of the positioning tenon and tenon groove, affecting the bearing capacity of the segment.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A shield-assembled segment positioning and bearing structure includes a positioning tenon and a mortise groove penetrating the segment joint surface. The positioning tenon includes a cylindrical sleeve, and frustum-shaped sleeves are symmetrically arranged at both ends of the cylindrical sleeve in the axial direction. The cylindrical sleeve and the frustum-shaped sleeves are integrally formed. A reinforcing rib structure is arranged inside the segment corresponding to the mortise groove, and the reinforcing rib structure is symmetrically arranged relative to the positioning tenon in the use state.

[0008] For the shield-assembled segment positioning and bearing structure of the present invention, by combining the structural characteristics of the actual shear failure zone of the segment, a reinforcing rib structure is arranged inside the segment perpendicular to the fracture surface. A positioning tenon with a specific structure is combined with the reinforcing rib structure. After the positioning tenon is installed in the mortise groove, that is, in the use state of the positioning tenon, the reinforcing rib structure is symmetrically arranged relative to the positioning tenon, greatly improving the shear resistance of the shield-assembled segment positioning and bearing structure, avoiding the premature failure of the segment due to stress concentration and losing the bearing capacity. At the same time, a cylindrical sleeve is adopted in the middle of the positioning tenon, which can increase the effective stress area when subjected to shear extrusion, avoid slight misalignment of the positioning tenon and significantly change its effective thickness, and realize the improvement of the shear resistance of the segment through the positioning and bearing structure.

[0009] As a preferred solution of the present invention, an anti-slip structure is arranged on the outer surface of the first-installed end of the positioning tenon. The first-installed end is the end that is installed first during the use of the positioning tenon, and is the end used to connect with the first-installed segment during the use of the positioning tenon. Through the anti-slip structure, the friction between the positioning tenon and the mortise groove can be increased, the positioning tenon can be stably arranged in the mortise groove of the first-installed segment, facilitating the positioning and installation of the later-installed segment, and reducing the misalignment between the positioning tenon and the mortise groove during the use of the positioning tenon.

[0010] As a preferred solution of the present invention, the positioning tenon includes a nylon-modified material structural member.

[0011] As a preferred solution of the present invention, the reinforcing rib structure includes a first reinforcing rib. The first reinforcing rib includes an arc segment straddling the mortise groove and first straight rib segments located at both ends of the arc segment. An extension segment is arranged at the end of the first straight rib segment far from the arc segment. The extension segment is the same as or close to the extending direction of the segment main reinforcement, and the extension segment is connected to the segment main reinforcement. The arc segment is located inside the arc segment structure of the segment. The first reinforcing rib with a special-shaped steel bar structure strengthens the mortise groove in a surrounding manner, avoiding cracks caused by stress concentration near the mortise groove.

[0012] As a preferred solution of the present invention, an angle X is formed between the first straight rib segments at both ends of the arc segment, and 45° ≤ X ≤ 90°. To transfer the force to the segment inside far from the mortise groove and improve the shear strength of the segment at the mortise groove position.

[0013] As a preferred embodiment of the present invention, the reinforcing rib structure includes at least two second reinforcing ribs. Each second reinforcing rib includes a second straight rib segment and hook portions located at both ends of the second straight rib segment, and the hook portions are connected to the segment main reinforcement bars.

[0014] As a preferred embodiment of the present invention, a first reinforcing rib is connected to the first row of segment main reinforcement bars adjacent to the segment joint surface. A second reinforcing rib is arranged on the outer side of the first reinforcing rib relative to the mortise groove, and the extension section passes through at least the hook portion.

[0015] As a preferred embodiment of the present invention, a second reinforcing rib is connected to the second row of segment main reinforcement bars adjacent to the segment joint surface. The second reinforcing rib connected to the second row of segment main reinforcement bars and the first reinforcing rib connected to the first row of segment main reinforcement bars are arranged opposite to each other in the axial direction of the positioning tenon.

[0016] A design method for a positioning and bearing structure of a shield - assembled segment includes a step of determining the longitudinal length L of the positioning tenon. The longitudinal length of the positioning tenon

[0017] wherein, R is the curvature radius of the connecting bolt, d 0 is the inner diameter of the positioning tenon, d 1 is the diameter of the connecting bolt, and h is the reserved clearance height between the end of the positioning tenon and the connecting bolt.

[0018] The design method for a positioning and bearing structure of a shield - assembled segment of the present invention accurately calculates the structural dimensions of the positioning tenon, reduces the structural gap between the positioning tenon and the mortise groove, makes the structural dimensions of the positioning tenon and the mortise groove match, reduces dislocation, and avoids the segment from losing its bearing capacity due to premature failure caused by stress concentration.

[0019] As a preferred embodiment of the present invention, it further includes a step of determining the mortise groove structure. The shape of the mortise groove is adapted to the positioning tenon, and the reinforcing rib structure is arranged in the segment corresponding to the mortise groove.

[0020] To sum up, due to the adoption of the above - mentioned technical solutions, the beneficial effects of the present invention are as follows:

[0021] 1. For the positioning and bearing structure of a shield - assembled segment of the present invention, by combining the structural characteristics of the actual shear failure area of the segment, a reinforcing rib structure is arranged in the segment perpendicular to the fracture surface, and a combination of a positioning tenon with a specific structure and the reinforcing rib structure is adopted, which greatly improves the shear resistance of the positioning and bearing structure of the shield - assembled segment, and avoids the segment from losing its bearing capacity due to premature failure caused by stress concentration;

[0022] 2. A positioning and bearing structure for shield - assembled segments of the present invention. The middle part of the positioning tenon adopts a cylindrical sleeve, which can increase the effective stress - bearing area when subjected to shear and extrusion forces, and prevent the positioning tenon from slightly shifting and significantly changing its effective thickness.

[0023] 3. A design method for the positioning and bearing structure of shield - assembled segments of the present invention. By accurately calculating the structural dimensions of the positioning tenon, the structural gap between the positioning tenon and the tenon groove is reduced, so that the structural dimensions of the positioning tenon and the tenon groove match, reducing the dislocation and avoiding the premature failure of the segment due to stress concentration and losing its bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the positioning tenon described in the present invention;

[0025] Figure 2 is a schematic structural diagram of the usage state of the positioning tenon described in the present invention;

[0026] Figure 3 is a schematic diagram of the relevant dimensions of a positioning and bearing structure for shield - assembled segments of an embodiment;

[0027] Figure 4 is a schematic structural diagram of the first reinforcing rib described in the present invention;

[0028] Figure 5 is a schematic structural diagram of the second reinforcing rib described in the present invention;

[0029] Figure 6 is a schematic structural diagram of the usage state of a positioning and bearing structure for shield - assembled segments of an embodiment;

[0030] Figure 7 is a schematic structural diagram of the usage state of a positioning and bearing structure for shield - assembled segments of an embodiment.

[0031] ICON:

[0032] 1 - positioning tenon, 11 - cylindrical sleeve, 12 - frustum - shaped sleeve, 2 - segment, 21 - tenon groove, 22 - segment main reinforcement, 3 - anti - slip structure, 4 - first reinforcing rib, 41 - arc segment, 42 - first straight rib segment, 43 - extension segment, 5 - second reinforcing rib, 51 - second straight rib segment, 52 - hook part, 6 - connecting bolt, 7 - segment main reinforcement. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be described in detail below with reference to the accompanying drawings.

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] Embodiment 1

[0036] As Figures 1-7 shown, a positioning and bearing structure for shield assembled segments includes a positioning tenon 1 and a mortise groove 21 that penetrates the joint surface of the segment 2. The positioning tenon 1 includes a cylindrical sleeve 11, and frustum-shaped sleeves 12 are symmetrically arranged at both ends of the cylindrical sleeve 11 in the axial direction. The cylindrical sleeve 11 and the frustum-shaped sleeves 12 are integrally formed. A reinforcing rib structure is arranged inside the segment 2 corresponding to the mortise groove 21, and the reinforcing rib structure is symmetrically arranged relative to the positioning tenon 1 in the use state.

[0037] Specifically, in this embodiment, the positioning tenon 1 is integrally formed by two symmetric frustum-shaped sleeves 12 on the left and right and a cylindrical sleeve 11 in the middle. The inner and outer diameters of the frustum-shaped sleeve 12 and the cylindrical sleeve 11 are the same at the contact surface, forming a through hole that penetrates along the axial direction. As Figures 2-3 shown, during use, the bent connecting bolt 6 passes through the through hole; the mortise groove 21 is arranged on the joint surface of the segment 2. During use, the positioning tenon 1 is inserted into the mortise groove 21, and the connecting bolt 6 passes through the positioning tenon 1.

[0038] Furthermore, in combination with the characteristic that V-shaped spreading cracks are likely to appear near the mortise groove 21 during the use of the conventional segment 2 in this embodiment, a reinforcing rib structure is arranged inside the segment 2 corresponding to the mortise groove 21. The plane where the reinforcing rib structure is located is perpendicular to the fracture surface. The reinforcing rib structure is connected to the reinforcement of the conventional segment 2 and is prefabricated as the reinforcement of the segment 2. It is arranged during the preparation process of the segment 2 and fixed inside the segment 2 after the segment 2 is formed. It can improve the shear resistance of the segment 2 near the mortise groove 21 on the basis of minimizing the manufacturing cost of the segment 2.

[0039] For the positioning and bearing structure of the shield assembled segment in this embodiment, by combining the structural characteristics of the actual shear failure area of the segment 2, a reinforcing rib structure is arranged inside the segment 2 perpendicular to the fracture surface, and a combination of the positioning tenon 1 with a specific structure and the reinforcing rib structure is adopted, which greatly improves the shear resistance of the segment 2 in the area where the positioning and bearing structure of the shield assembled segment is located, and avoids the premature failure of the segment 2 due to stress concentration and loss of bearing capacity. At the same time, the middle part of the positioning tenon 1 adopts a cylindrical sleeve 11, which can increase its effective stress area when subjected to shear extrusion, avoid slight misalignment of the positioning tenon 1 and significantly change its effective thickness, and further avoid the premature failure of the segment 2 due to stress concentration and loss of bearing capacity.

[0040] Preferably, an anti-slip structure 3 is provided on the outer surface of the pre-installed end of the positioning tenon 1. The pre-installed end is the end of the positioning tenon 1 that is pre-installed into the segment when in use, that is, the end where the positioning tenon 1 is connected to the pre-installed segment, including 1 / 2 of the total length of the positioning tenon 1 in the axial direction. In this embodiment, a thread groove is provided on the outer surface of the pre-installed end as the anti-slip structure 3 to increase the friction between the positioning tenon 1 and the tenon groove 21 and reduce the dislocation between the positioning tenon 1 and the tenon groove 21. Preferably, the anti-slip structure 3 is provided on the surface of the frustum-shaped sleeve 12 located at the pre-installed end.

[0041] Specifically, the anti-slip mechanism 3 can also be structures such as grooves and protrusions.

[0042] Preferably, the positioning tenon 1 includes a nylon modified material structural member, preferably a nylon glass fiber modified material structural member.

[0043] Embodiment 2

[0044] As Figures 1-7 shown, for a shield segment assembling type segment positioning and bearing structure in this embodiment, on the basis of Embodiment 1, the reinforcing rib structure includes a first reinforcing rib 4. The first reinforcing rib 4 includes an arc segment 41 straddling the tenon groove 21 and first straight rib segments 42 located at both ends of the arc segment 41. An extension segment 43 is provided at the end of the first straight rib segment 42 away from the arc segment 41. The extension segment 43 is in the same or similar direction as the extension direction of the segment main reinforcement 22, and the extension segment 43 is connected to the segment main reinforcement 22. Among them, the segment main reinforcement 22 is a multi-layer main reinforcement structure arranged along the arc direction of the segment 2 inside the segment 2.

[0045] For a shield segment assembling type segment positioning and bearing structure in this embodiment, the first reinforcing rib 4 is made of special-shaped steel bars. As Figure 4 shown, the middle part of the first reinforcing rib 4 is the arc segment 41, the two ends of the arc segment 41 are bent to form the first straight rib segments 42, and the two ends of the first straight rib segments 42 are bent to form the extension segment 43.

[0046] Specifically, as Figure 6 shown, the first reinforcing rib 4 straddles the tenon groove 21 and is symmetric with respect to the axial direction of the positioning tenon 1 in the use state; the arc segment 41 is arranged on the inner side close to the arc of the segment 2 and is welded to the segment main reinforcement 22 on the inner side close to the arc of the segment 2; the extension segment 43 is in a similar direction to the extension direction of the segment main reinforcement 22 on the outer side close to the arc of the segment 2 and is welded to the segment main reinforcement 22; the plane where the first reinforcing rib 4 is located is perpendicular to the axial direction of the positioning tenon 1 in the use state, perpendicular to the fracture surface of the segment 2, and parallel to the joint surface of the segment 2.

[0047] Preferably, an angle X is formed between the two first straight rib segments 42 of the first reinforcing rib 4, and 45° ≤ X ≤ 90°, so as to transfer the force to the inside of the segment 2 away from the tenon groove 21. Preferably, the angle X is 60°.

[0048] Preferably, the first reinforcing rib 4 is connected to the first row of segment main reinforcements 22 near the joint surface of the segment 2, so as to be closer to the opening position of the mortise groove 21.

[0049] Embodiment 3

[0050] As Figures 1-7 shown, for a shield assembled segment positioning and bearing structure of this embodiment, on the basis of Embodiment 1, as Figures 6-7 shown, the reinforcing rib structure includes at least two second reinforcing ribs 5, each of the second reinforcing ribs 5 includes a second straight rib section 51 and hook parts 52 located at both ends of the second straight rib section 51, and the hook parts 52 are connected to the segment main reinforcements 22.

[0051] For a shield assembled segment positioning and bearing structure of this embodiment, the second reinforcing rib 5 is a special-shaped steel bar with hook parts 52 formed by bending at the ends of the straight ribs. Two second reinforcing ribs 5 are symmetrically arranged on both sides of the positioning tenon 1 in the use state. The second straight rib sections 51 of the two second reinforcing ribs 5 are both close to the radial direction of the segment 2, and an angle of 45° - 90° is formed between the two second straight rib sections 51. The hook parts 52 of the two second reinforcing ribs 5 are both hung and connected to the segment main reinforcements 22 and then welded.

[0052] Specifically, according to the actual situation, the number of the second reinforcing ribs 5, the distance from the positioning tenon 1 in the use state, the angle between the two second reinforcing ribs 5, etc. can be adjusted to change the shear resistance strengthening ability of the segment 2 near the mortise groove 21.

[0053] Preferably, the second reinforcing rib 51 is connected to the first row of segment main reinforcements 22 near the joint surface of the segment 2, so as to be closer to the opening position of the mortise groove 21.

[0054] Embodiment 4

[0055] As Figures 1-7 shown, for a shield assembled segment positioning and bearing structure of this embodiment, on the basis of Embodiments 2 and 3, a first reinforcing rib 4 is connected and arranged on the first row of segment main reinforcements 22 near the joint surface of the segment 2. A second reinforcing rib 5 is arranged on the outer side of the first reinforcing rib 4 relative to the mortise groove 21, and the extension section 43 at least passes through the hook part 52.

[0056] For a shield assembled segment positioning and bearing structure of this embodiment, as Figure 6As shown in the figure, the first reinforcing rib 4 and the second reinforcing rib 5 are simultaneously arranged on the plane where the main bars 22 of the first row of segments are located near the joint surface of the segment 2. The first straight rib section 41 of the first reinforcing rib 4 is parallel to the second straight rib section 51 of the second reinforcing rib 5, and the extension section 43 of the first reinforcing rib 4 passes through the hook part 52 of the second reinforcing rib 5 and is welded to the main bars 22 of the first row of segments. The first reinforcing rib 4 and the second reinforcing rib 5 cooperate to strengthen the shear resistance of the area near the opening of the mortise groove 21. In cooperation with the positioning tenon 1 structure, it can avoid cracks caused by stress concentration near the mortise groove 21 of the segment 2 to the greatest extent, effectively improve the stability and shear resistance of the positioning bearing structure, and prevent the segment 2 from losing its bearing capacity due to stress concentration.

[0057] Embodiment 5

[0058] As Figures 1-7 shown, a positioning bearing structure for shield assembled segments in this embodiment, on the basis of Embodiment 4, a second reinforcing rib 5 is connected and arranged on the main bars 22 of the second row of segments near the joint surface of the segment 2. The second reinforcing rib 5 connected to the main bars 22 of the second row of segments and the first reinforcing rib 4 connected to the main bars 222 of the first row of segments are arranged oppositely in the axial direction of the positioning tenon 1.

[0059] A positioning bearing structure for shield assembled segments in this embodiment preferably has the second straight rib section 51 of the second reinforcing rib 5 connected to the main bars 22 of the second row of segments coplanar and parallel to the first straight rib section 41 of the first reinforcing rib 4 connected to the main bars 22 of the first row of segments in the axial direction of the positioning tenon 1, so that the positioning bearing structure forms a strengthening structure with a reduced coverage area along the depth direction of the mortise groove 21, which is adapted to the V-shaped cracks that appear in the conventional segment 2, and realizes corresponding strengthening on the spreading path of the traditional V-shaped cracks, and can effectively inhibit the appearance of V-shaped cracks near the mortise groove 21.

[0060] Furthermore, a positioning bearing structure for shield assembled segments in this embodiment strengthens the main bars 22 of two rows of segments near the joint surface of the segment 2 respectively, realizes the separate strengthening of the opening side and the bottom side of the mortise groove 21, and in cooperation with the positioning tenon 1 structure, can avoid the damage of the segment 2 caused by the misalignment of the positioning tenon 1 and the mortise groove 21 to the greatest extent.

[0061] Embodiment 6

[0062] A design method for a positioning bearing structure of shield assembled segments, including the positioning bearing structure of Embodiment 5, as Figures 1-7 shown, the positioning bearing structure includes a positioning tenon 1 and a mortise groove 21, and includes the step of determining the longitudinal length L of the positioning tenon 1. The shape of the mortise groove 21 is adapted to the positioning tenon 1, and a reinforcing rib structure is arranged in the segment 2 corresponding to the mortise groove 21. The longitudinal length of the positioning tenon 1

[0063]

[0064] In the formula, R is the radius of curvature of the connecting bolt 6, d 0 is the inner diameter of the positioning tenon 1, d 1 is the diameter of the connecting bolt 6, and h is the reserved clearance height between the end of the positioning tenon 1 and the connecting bolt 6.

[0065] A design method for the positioning and bearing structure of the segment assembled by shield tunneling. The positioning tenon 1 includes a cylindrical sleeve 11 and frustum-shaped sleeves 12 provided at both longitudinal ends of the cylindrical sleeve 11. The overall longitudinal length of the positioning tenon 1 is L and satisfies the above formula. Among them, the radius of curvature R of the connecting bolt 6, the inner diameter d 0 of the positioning tenon 1, and the diameter d 1 of the connecting bolt 6 can all be determined according to the design of the segment 2. The reserved clearance height h between the end of the positioning tenon 1 and the connecting bolt 6 is inversely related to L. The smaller h is, the larger L is, and it can match the design size of the mortise groove 21 more, and the shear resistance is significantly improved.

[0066] Taking the positioning and bearing structure of a specific structure as an example for illustration, as Figures 1-7 shown, the positioning and bearing structure includes a positioning tenon 1, a mortise groove 21 and a reinforcing rib structure corresponding to the position of the mortise groove 21. The longitudinal length of the cylindrical sleeve 11 of the positioning tenon 1 is set to 10 mm. Multiple thread grooves are provided on the outer surface of the pre-installed end of the positioning tenon 1 as an anti-slip structure 3, preferably three thread grooves are provided. The groove depth, groove width and groove pitch of the thread grooves are all 2 mm. The shape of the mortise groove 21 is the same as that of the mortise groove 21 of the conventional segment 2 and includes two rows of reinforcing rib structures arranged parallel to the joint surface of the segment 2. The first row of reinforcing rib structures near the joint surface includes a first reinforcing rib 4 and two second reinforcing ribs 5. The second row of reinforcing rib structures next to the joint surface includes two second reinforcing ribs 5. According to the design of the segment 2, it is known that the radius of curvature R of the connecting bolt 6 is 350 mm, the inner diameter d 0 of the positioning tenon 1 is 51.8 mm, the diameter d 1 of the connecting bolt 6 is 31 mm, and the reserved clearance height h is 4.8 mm. The formula for calculating the longitudinal length L of the positioning tenon 1 is obtained as:

[0067]

[0068] Solving the formula gives L = 120 mm.

[0069] A design method for the positioning and bearing structure of a shield-assembled segment. By accurately calculating the structural dimensions of the positioning tenon 1, the structural gap between the positioning tenon 1 and the tenon groove 21 is reduced, so that the structural dimensions of the positioning tenon 1 and the tenon groove 21 match, reducing dislocation. It can cooperate with the tenon groove 21 provided with a reinforcing rib structure, effectively avoiding the premature failure of the segment 2 caused by stress concentration and losing the bearing capacity.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shield assembled segment positioning bearing structure, comprising a positioning tenon (1) and a tenon groove (21) penetrating the joint surface of the segment (2), characterized in that: The positioning tenon (1) comprises a cylindrical sleeve (11), and truncated cone-shaped sleeves (12) are symmetrically arranged at both ends of the cylindrical sleeve (11) in the axial direction. The cylindrical sleeve (11) and the truncated cone-shaped sleeve (12) are integrally formed. A reinforcing rib structure is arranged in the pipe segment (2) corresponding to the tenon groove (21), and the reinforcing rib structure is symmetrically arranged relative to the positioning tenon (1) in the use state. The reinforcing rib structure comprises a first reinforcing rib (4), and the first reinforcing rib (4) comprises a reinforcing rib (4) arranged across the tenon groove. an arc segment (41) and a first straight rib segment (42) located at both ends of the arc segment (41); an extension segment (43) is provided at an end of the first straight rib segment (42) away from the arc segment (41); the extension segment (43) extends in the same or similar direction as the segment main rib (22); the extension segment (43) is connected to the segment main rib (22); the shape of the tenon groove (21) is adapted to the positioning tenon (1); and the reinforcing rib structure is provided in the segment (2) corresponding to the tenon groove (21); The longitudinal length of the positioning tenon (1) ; In the formula, R is the radius of curvature of the bolt (6), d0 is the inner diameter of the positioning tenon (1), d1 is the diameter of the bolt (6), and h is the height of the reserved gap between the end of the positioning tenon (1) and the bolt (6).

2. A shield assembled segment positioning and bearing structure as claimed in claim 1, characterized in that: An anti-slip structure (3) is provided on the outer surface of the first installation end of the positioning tenon (1).

3. A shield assembled segment positioning and bearing structure as claimed in claim 1, characterized in that: The positioning tenon (1) comprises a nylon modified material structural component.

4. A shield assembled segment positioning and bearing structure as claimed in claim 1, characterized in that: An included angle X is formed between the first straight rib sections (42) at both ends of the arc section (41), and the angle is 45°≤X≤90°.

5. A shield assembled segment positioning and bearing structure as claimed in claim 4, characterized in that: The reinforcing rib structure comprises at least two second reinforcing ribs (5), each of the second reinforcing ribs (5) comprising a second straight rib segment (51) and hook portions (52) located at two ends of the second straight rib segment (51), the hook portions (52) being connected to the main ribs (22) of the segment.

6. A shield assembled segment positioning and bearing structure as claimed in claim 5, characterized in that: A first reinforcing rib (4) is connected to the first row of segment main ribs (22) adjacent to the segment (2) joint surface, a second reinforcing rib (5) is arranged on the outer side of the first reinforcing rib (4) relative to the tongue and groove (21), and the extension section (43) at least passes through the hook portion (52).

7. A shield assembled segment positioning and bearing structure as claimed in claim 6, characterized in that: A second reinforcing rib (5) is connected to the second row of segment main ribs (22) adjacent to the segment joint surface (2), and the second reinforcing rib (5) connected to the second row of segment main ribs (22) and the first reinforcing rib (4) connected to the first row of segment main ribs (22) are arranged opposite to each other in the axial direction of the positioning tenon (1).

8. A method for designing a shield assembled segment positioning bearing structure according to any one of claims 1 to 7, characterized in that: The method comprises the steps of determining a longitudinal length L of the positioning tenon (1), wherein the longitudinal length L of the positioning tenon (1) is ; Wherein, R is the radius of curvature of the bolt (6), d0 is the inner diameter of the positioning tenon (1), d1 is the diameter of the bolt (6), and h is the height of the reserved gap between the end of the positioning tenon (1) and the bolt (6); The method further comprises the step of determining a structure of a tenon groove (21), wherein the shape of the tenon groove (21) is adapted to the positioning tenon (1), and the reinforcing rib structure is arranged in the pipe segment (2) corresponding to the tenon groove (21).

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