Tandem type longitudinal connecting assembly for shield segments and inter-ring connecting method

Abstract

The invention relates to a shield segment tandem type longitudinal connecting assembly which comprises a full-length screw rod, a long-length screw rod, a long-length screw rod, a long-length screw rod, a long-length screw rod, a long-length screw rod and a short-length screw rod. The first lining is pre-embedded in one side of the shield segment and arranged at the first end of the full-length screw in a sleeving manner; the second lining is pre-buried on the other side of the shield segment and is arranged at the second end of the full-length screw rod in a sleeving manner; the special-shaped locking nut is positioned between the second bushing and the full-length screw rod and is screwed on an external thread at the second end of the full-length screw rod; and the shear-resistant connecting sleeves are used for connecting the two adjacent longitudinal connecting assemblies. The invention further provides an inter-ring connection method of the shield segment tandem type longitudinal connection assembly, the tensile stress of segment concrete is avoided, the longitudinal rigidity of the shield segments is greatly improved, the inter-ring shear strength of the shield segments is effectively improved, and the service life of the shield segments is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of shield segment assembly, and in particular to a shield segment serial longitudinal connection assembly and an inter-ring connection method. Background Art

[0002] As the core component of the tunnel lining, shield segments directly bear soil pressure, groundwater pressure, and special loads. The mechanical properties of their longitudinal joints determine the overall stress safety of the tunnel structure. Existing technologies generally use independent longitudinal bolts for connection, such as short straight bolts and bent bolts. This method has two major technical drawbacks: first, the longitudinal force transmission is discontinuous. The traditional discontinuous bolt layout is prone to stress concentration, causing cracking of the segments when the stratum settles; second, the shear resistance between the rings is weak. Although the current concave-convex tongue-and-groove structure can control misalignment, it requires extremely high assembly accuracy. In particular, misalignment is prone to exceed the standard in curved sections, affecting the accuracy of the tunnel axis and waterproof performance.

[0003] Based on this, a shield segment serial longitudinal connection assembly and an inter-ring connection method that can overcome the above-mentioned defects are proposed to address the above-mentioned problems.

[0004] It will be understood that the above statements merely provide background technology related to the present invention and do not necessarily constitute prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a shield segment serial longitudinal connection assembly and an inter-ring connection method to avoid tensile stress in the segment concrete, greatly improve the longitudinal stiffness of the shield segment, improve the shear strength between the shield segment rings, and extend the service life of the shield segment.

[0006] To achieve the above-mentioned purpose, the first aspect of the present invention provides a shield segment serial longitudinal connection assembly, comprising: a full-length screw rod, which is longitudinally arranged in the shield segment, and external threads are respectively provided at both ends of the full-length screw rod; a first bushing, which is pre-buried in one side of the shield segment and sleeved on the first end of the full-length screw rod; a second bushing, which is pre-buried in the other side of the shield segment and sleeved on the second end of the full-length screw rod; a special-shaped locking nut, which is located between the second bushing and the full-length screw rod and is screwed on the external thread of the second end of the full-length screw rod; a shear-resistant connecting sleeve, which is used to connect two adjacent longitudinal connection assemblies, one end of which is coaxially sleeved on the second end of the full-length screw rod of one longitudinal connection assembly, and is located between the full-length screw rod and the second bushing of the longitudinal connection assembly, and the other end of which is coaxially sleeved on the first end of the full-length screw rod of another adjacent longitudinal connection assembly, and is located between the full-length screw rod and the first bushing of the longitudinal connection assembly.

[0007] Preferably, the connecting end surface of the special-shaped locking nut near the second end of the through-length screw in the longitudinal connector is provided with a plurality of grooves evenly distributed along the circumference, and the special-shaped locking nut is provided with a special-shaped locking nut wrench with a protruding structure for use therewith.

[0008] Preferably, the groove forms a mating connection with the raised structure on the special-shaped locking nut wrench. When the raised structure is embedded in the groove, the special-shaped locking nut can be driven to rotate by rotating the special-shaped locking nut wrench, thereby screwing the special-shaped locking nut onto the second end of the full-length screw and fixing it.

[0009] Preferably, the inner wall of the shear-resistant connecting sleeve is provided with a thread shape matching the external thread of the full-length screw; and the outer wall of the shear-resistant connecting sleeve is provided with a spiral pattern or a concave-convex tooth structure to enhance the shear-resistant bite force.

[0010] Preferably, both ends of the through-length screw are designed with countersunk hexagonal sockets, and the middle section is a smooth rod structure or retains external threads as needed; the inner diameters of the first bushing and the second bushing are both larger than the diameter of the through-length screw and do not fit the through-length screw.

[0011] The second aspect of the present invention provides a method for connecting rings of a shield segment serial longitudinal connection assembly, which is implemented by using any of the above-mentioned shield segment serial longitudinal connection assemblies, and is used to connect a front ring segment and at least one rear ring segment, comprising the following steps: S1, when prefabricating the shield segment, pre-embedding a full-length screw mounting hole, a first bushing and a second bushing in a mold, configuring a full-length screw of corresponding length, and installing the full-length screw into the full-length screw mounting hole, and inserting the full-length screw into the second bushing of the full-length screw. The end is equipped with a special-shaped locking nut and temporarily fixed; S2, assembling the front ring segment, and since the front ring segment is the first ring segment, the shear connection sleeve at the first end of the full-length screw of the front ring segment is not installed, and the front ring segment is directly fixed on the reaction reference ring, and the special-shaped locking nut wrench is used to screw the special-shaped locking nut at the second end of the full-length screw of the front ring segment to the bottom of the external thread of the second end of the full-length screw of the front ring segment until it contacts the bottom of the second bushing of the front ring segment to form a fixation; S3, After the front ring segment is fixed, the rear ring segment is assembled in sequence, and one end of the shear connection sleeve is installed on the second end of the full-length screw of the front ring segment by the mechanical arm, and the shear connection sleeve is screwed in so that it contacts the special-shaped locking nut of the front ring segment to form a fixation, and the first end of the full-length screw of the rear ring segment is aligned with the other end of the shear connection sleeve to form a coaxial docking; S4, the second end of the full-length screw of the rear ring segment is rotated by the full-length screw rotating tool, so that the first end of the full-length screw of the rear ring segment is screwed into the The other end of the shear-resistant connecting sleeve is in contact with the second end of the full-length screw of the front ring segment and fixed; S5, using a special-shaped locking nut wrench to tighten the special-shaped locking nut at the second end of the full-length screw of the rear ring segment and fix it, completing the longitudinal connection between the front ring segment and the rear ring segment; S6, repeating steps S3 to S5, continuing to assemble adjacent rear ring segments at the second end of the aforementioned rear ring segment, completing the assembly of the serial longitudinal connection assembly, until all rear ring segments are assembled into a whole ring.

[0012] Preferably, in S1, before the shield segments are installed, the joints between the through-length screw and the first and second bushings are filled with waterproof materials respectively.

[0013] Preferably, when each shield segment is prefabricated, several groups of longitudinal connection components are arranged at intervals to form multi-point connections.

[0014] Preferably, the S2 also includes the step of fixing one end of the rubber waterstop to the front ring segment sealing groove provided on the front ring segment; the S3 also includes the step of fixing the other end of the rubber waterstop to the rear ring segment sealing groove provided on the rear ring segment.

[0015] Among them, when repeating steps S3 to S5 to assemble adjacent rear ring segments, one end of the rubber water stop is fixed in the rear ring segment sealing groove set at the other end of the installed rear ring segment, and the other end of the rubber water stop is fixed in the rear ring segment sealing groove set at one end of the newly assembled adjacent rear ring segment.

[0016] Preferably, the S4 further includes the step of extruding the rubber water stop strip to form a seal when the front ring segment and the rear ring segment, as well as the adjacent rear ring segments, are connected through the series longitudinal connection assembly.

[0017] In summary, compared with the prior art, the present invention has at least the following advantages:

[0018] (1) The present invention realizes that after the shield segments are assembled into rings, there are no longitudinal hand holes inside the segments, and the entire shield segment ring is longitudinally connected by serial bolts, thereby avoiding tensile stress in the segment concrete;

[0019] (2) The present invention adopts a longitudinal continuous screw, which significantly improves the force transmission performance and greatly increases the longitudinal stiffness of the shield segment. In the case of uneven ground settlement, the incidence of segment cracks is greatly reduced, thereby extending the service life of the shield segment.

[0020] (3) The present invention effectively improves the shear strength between rings through the combined structure;

[0021] (4) The present invention reduces the installation time of shield segments and optimizes efficiency through modular prefabrication;

[0022] (5) The structural surface of the present invention has no bolt holes and reinforcing ribs, which can effectively reduce the cost of prefabricated structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of a shield segment serially connected longitudinally assembly according to the present invention;

[0024] Figure 2 This is a schematic diagram of the connection of the shield segment serial longitudinal connection assembly in the present invention;

[0025] Figure 3 This is a schematic diagram of the connection when a rubber water stop strip is used for sealing in the present invention;

[0026] Figure 4 It is a top view of the shield segment serial longitudinal connection assembly and the use of rubber water stop strips for sealing in the present invention.

[0027] Description of reference numerals:

[0028] 1-through-length screw, 2-first bushing, 3-shear-resistant connecting sleeve, 4-second bushing, 5-special-shaped locking nut, 51-connecting end face, 6-special-shaped locking nut wrench, 7-front ring segment, 71-front ring segment sealing groove, 8-rear ring segment, 81-rear ring segment sealing groove, 9-waterproof material, 10-rubber water stop. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1 ~Attached Figure 4 , the present invention is further explained by describing a preferred specific embodiment in detail.

[0030] It should be noted that the drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the embodiments of the present invention, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0031] It should be noted that, in the present invention, relational terms such as first and second, etc. are used only 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 "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only the elements explicitly listed, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0032] like Figure 1 and Figure 2 As shown, the first aspect of the present invention provides a shield segment serial longitudinal connection assembly, comprising: a full-length screw 1, which is longitudinally arranged in the shield segment, and the two ends of the full-length screw 1 are respectively provided with external threads; a first bushing 2, which is pre-buried in one side of the shield segment and sleeved on the first end of the full-length screw 1; a second bushing 4, which is pre-buried in the other side of the shield segment and sleeved on the second end of the full-length screw 1; a special-shaped locking nut 5, which is located between the second bushing 4 and the full-length screw 1 and screwed on the external thread of the second end of the full-length screw 1; a shear-resistant connecting sleeve 3, which is used to connect two adjacent longitudinal connection assemblies, one end of which is coaxially sleeved on the second end of the full-length screw 1 of one longitudinal connection assembly, and is located between the full-length screw 1 and the second bushing 4 of the longitudinal connection assembly, and the other end of which is coaxially sleeved on the first end of the full-length screw 1 of another adjacent longitudinal connection assembly, and is located between the full-length screw 1 and the first bushing 2 of the longitudinal connection assembly.

[0033] Furthermore, the connection end surface 51 of the shaped locking nut 5, which is located near the second end of the full-length screw 1 in the longitudinal connector, is provided with a plurality of grooves evenly distributed along the circumference. The shaped locking nut 5 is also equipped with a shaped locking nut wrench 6 having a protruding structure for use therewith. It should be noted that the grooves are capable of forming a mating connection with the protruding structure on the shaped locking nut wrench 6. When the protruding structure engages with the grooves, rotation of the shaped locking nut wrench 6 drives the shaped locking nut 5 to rotate, thereby screwing the shaped locking nut 5 onto the second end of the full-length screw 1 and securing it.

[0034] Furthermore, the inner wall of the shear-resistant connecting sleeve 3 is provided with a thread shape matching the external thread of the full-length screw 1; and the outer wall of the shear-resistant connecting sleeve 3 is provided with a spiral pattern or a concave-convex tooth structure to enhance the shear-resistant bite force.

[0035] For example, when connecting two adjacent longitudinal connection components, first, a shear-resistant connection sleeve 3 is installed on the second end of the full-length screw 1 of the previous longitudinal connection component, so that it is sleeved between the full-length screw 1 and the second sleeve 4, and the shear-resistant connection sleeve 3 is screwed in so that its top end contacts the special-shaped locking nut 5 of the previous longitudinal connection component; secondly, the first end of the full-length screw 1 of the subsequent longitudinal connection component is aligned with the second end of the full-length screw 1 of the previous longitudinal connection component, and the full-length screw rotation tool is used to rotate the second end of the full-length screw 1 of the subsequent longitudinal connection component, so that the first end of the full-length screw 1 of the subsequent longitudinal connection component is screwed into the shear-resistant connection sleeve 3 and contacts the second end of the full-length screw 1 of the previous longitudinal connection component to form a coaxial docking; finally, the special-shaped locking nut 5 at the second end of the full-length screw 1 of the subsequent longitudinal connection component is tightened and fixed to complete the connection between the two longitudinal connection components.

[0036] Furthermore, both ends of the through-length screw 1 are designed with countersunk hexagonal sockets, and the middle section is a polished rod structure or retains external threads as needed.

[0037] Furthermore, the inner diameters of the first bushing 2 and the second bushing 4 are both larger than the diameter of the full-length screw 1 , and do not fit in contact with the full-length screw 1 .

[0038] See also Figure 2 A second aspect of the present invention provides a method for connecting rings of a shield segment serial longitudinal connection assembly, which is implemented using the above-mentioned shield segment serial longitudinal connection assembly and is used to connect a front ring segment 7 and at least one rear ring segment 8, and specifically includes the following steps:

[0039] S1. When prefabricating shield segments, embed a full-length screw mounting hole, a first bushing 2, and a second bushing 4 in the mold, configure a full-length screw 1 of corresponding length, install the full-length screw 1 into the full-length screw mounting hole, and configure a special-shaped locking nut 5 at the second end of the full-length screw 1 and temporarily secure it;

[0040] S2. Assemble the front ring segment 7. Since the front ring segment 7 is the first ring segment, the shear connection sleeve 3 at the first end of the full-length screw 1 of the front ring segment 7 is not installed. The front ring segment 7 is directly fixed to the reaction reference ring. The special-shaped locking nut wrench 6 is used to screw the special-shaped locking nut 5 at the second end of the full-length screw 1 of the front ring segment 7 onto the bottom of the external thread of the second end of the full-length screw 1 of the front ring segment 7 until it contacts the bottom of the second bushing 4 of the front ring segment 7 to form a fixation;

[0041] S3. After the front ring segment 7 is fixed, the rear ring segment 8 is assembled in sequence. One end of the shear connection sleeve 3 is installed on the second end of the full-length screw 1 of the front ring segment 7 by the robotic arm. The shear connection sleeve 3 is screwed in so that it contacts the special-shaped locking nut 5 of the front ring segment 7 to form a fixed connection. The first end of the full-length screw 1 of the rear ring segment 8 is aligned with the other end of the shear connection sleeve 3 to form a coaxial butt joint.

[0042] S4, using a full-length screw rotating tool to rotate the second end of the full-length screw 1 of the rear ring segment 8, so that the first end of the full-length screw 1 of the rear ring segment 8 is screwed into the other end of the shear connection sleeve 3 and contacts and fixes with the second end of the full-length screw 1 of the front ring segment 7;

[0043] S5. Use a special-shaped locking nut wrench 6 to tighten the special-shaped locking nut 5 at the second end of the full-length screw 1 of the rear ring segment 8 to secure it, thereby completing the longitudinal connection between the front ring segment 7 and the rear ring segment 8;

[0044] S6. Repeat steps S3 to S5, continue assembling adjacent rear ring segments 8 at the second end of the aforementioned rear ring segment 8, and complete the assembly of the series-connected longitudinal components until all rear ring segments 8 are assembled into a complete ring.

[0045] Furthermore, in S1, before the shield segment is installed, the joints between the through-length screw 1 and the first bushing 2 and the second bushing 4 are filled with waterproof material 9 to form a continuous waterproof sealing layer to prevent water leakage from the joints. For example, in this embodiment, the waterproof material 9 is made of polyurethane. It is worth noting that Figure 4As shown, when each shield segment is prefabricated, several groups of longitudinal connection components are arranged at intervals, that is, when each shield segment is prefabricated, several full-length screws 1 are arranged at corresponding positions inside it along the horizontal direction, and a corresponding number of full-length screw mounting holes, first bushings 2 and second bushings 4 are pre-buried. Therefore, when the shield segments are spliced, multi-point connections are formed, thereby forming an efficient and stable connection structure, so that the shield segments can form a tight and reliable connection in the longitudinal direction, thereby improving the structural safety and construction efficiency of the entire shield tunnel.

[0046] See also Figure 3 and Figure 4 It can be understood that in order to ensure the sealing of the joints between the front ring segment 7 and the rear ring segment 8, as well as the adjacent rear ring segments 8, while being fastened together by the longitudinal connecting assembly, a rubber waterstop 10 is also laid between the front ring segment 7 and the rear ring segment 8, as well as the adjacent rear ring segments 8, and a seal is formed by axial pressure during the connection.

[0047] Specifically, the above-mentioned S2 also includes the step of fixing one end of the rubber waterstop 10 to the front ring segment sealing groove 71 provided on the front ring segment 7; the above-mentioned S3 also includes the step of fixing the other end of the rubber waterstop 10 to the rear ring segment sealing groove 81 provided on the rear ring segment 8; and when repeating steps S3 to S5 to assemble adjacent rear ring segments 8, one end of the rubber waterstop 10 is fixed in the rear ring segment sealing groove 81 provided at the other end of the installed rear ring segment 8, and the other end of the rubber waterstop 10 is fixed in the rear ring segment sealing groove 81 provided at one end of the newly assembled adjacent rear ring segment 8.

[0048] Specifically, the S4 also includes a step of squeezing the rubber water stop strip 10 to form a seal when the front ring segment 7 and the rear ring segment 8, as well as the adjacent rear ring segments 8, are connected through the series longitudinal connection assembly.

[0049] Furthermore, in a preferred embodiment of the present invention, regarding the sealing operation of the rubber waterstop strip 10, one end of the rubber waterstop strip 10 can be first fixed to the front ring segment sealing groove 71 provided on the front ring segment 7, and then the rear ring segment 8 is pushed closer, and the other end of the rubber waterstop strip 10 is slid into the segment sealing groove 81, and then squeezed to form a seal. When the adjacent rear ring segment 8 is repeatedly assembled, the above operation is also adopted.

[0050] In summary, the present invention proposes a shield segment serial longitudinal connection assembly and an inter-ring connection method, which realizes that after the shield segments are assembled into rings, there are no longitudinal hand holes inside the segments, and the entire shield segment rings are longitudinally connected by serial bolts, thereby avoiding the tensile stress of the segment concrete. Compared with traditional inter-ring connection bolts, the specific advantages are as follows: the present invention adopts a longitudinal continuous screw rod, which significantly improves the force transmission performance, greatly improves the longitudinal stiffness of the shield segment, and greatly reduces the crack incidence rate of the segment in the case of uneven ground settlement, thereby extending the service life of the shield segment; the present invention effectively improves the shear strength between the rings through a combined structure; the present invention reduces the installation time of the shield segment and optimizes the efficiency through a modular prefabricated structure; the structural surface of the present invention has no bolt holes and reinforcing ribs, which can effectively reduce the cost of prefabricated structures.

[0051] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A shield segment serial longitudinal connection assembly, characterized in that: include: A full-length screw rod is longitudinally arranged in the shield segment, and both ends of the full-length screw rod are provided with external threads; A first bushing is pre-buried on one side of the shield segment and sleeved on the first end of the full-length screw; A second bushing is pre-buried on the other side of the shield segment and sleeved on the second end of the full-length screw; a special-shaped locking nut, located between the second bushing and the full-length screw, and screwed onto the external thread of the second end of the full-length screw; A shear-resistant connecting sleeve is used to connect two adjacent longitudinal connecting components. One end of the sleeve is coaxially sleeved on the second end of the full-length screw of a longitudinal connecting component and is located between the full-length screw of the longitudinal connecting component and the second bushing. The other end of the sleeve is coaxially sleeved on the first end of the full-length screw of another adjacent longitudinal connecting component and is located between the full-length screw of the longitudinal connecting component and the first bushing.

2. The shield segment serial longitudinal connection assembly according to claim 1, characterized in that: The connecting end surface of the special-shaped locking nut close to the second end of the full-length screw in the longitudinal connector is evenly distributed with multiple grooves along the circumference, and the special-shaped locking nut is equipped with a special-shaped locking nut wrench with a protruding structure for use with it.

3. The shield segment serial longitudinal connection assembly according to claim 2, characterized in that: The groove forms a mating connection with the raised structure on the special-shaped locking nut wrench. When the raised structure is embedded in the groove, the special-shaped locking nut can be driven to rotate by rotating the special-shaped locking nut wrench, thereby screwing the special-shaped locking nut onto the second end of the full-length screw and fixing it.

4. The shield segment serial longitudinal connection assembly according to claim 1, characterized in that: The inner wall of the shear-resistant connecting sleeve is provided with a thread shape matching the external thread of the full-length screw; and the outer wall of the shear-resistant connecting sleeve is provided with a spiral pattern or a concave-convex tooth structure to enhance the shear-resistant bite force.

5. The shield segment serial longitudinal connection assembly according to claim 1, characterized in that: The two ends of the full-length screw are designed with countersunk hexagonal heads, and the middle section can be a polished rod structure or retain external threads as needed; The inner diameters of the first bushing and the second bushing are both larger than the diameter of the full-length screw and do not fit in with the full-length screw.

6. A method for connecting rings of a shield segment serial longitudinal connection assembly, implemented using the shield segment serial longitudinal connection assembly according to any one of claims 1 to 5, for connecting a front ring segment and at least one rear ring segment, characterized in that: The following steps are involved: S1. When prefabricating shield segments, embed a full-length screw mounting hole, a first bushing, and a second bushing in the mold, configure a full-length screw of corresponding length, install the full-length screw into the full-length screw mounting hole, and configure a special-shaped locking nut at the second end of the full-length screw and temporarily secure it; S2. Assemble the front ring segment. Since the front ring segment is the first ring segment, the shear connection sleeve at the first end of the full-length screw of the front ring segment is not installed. The front ring segment is directly fixed to the reaction reference ring. A special-shaped locking nut wrench is used to screw the special-shaped locking nut at the second end of the full-length screw of the front ring segment onto the bottom of the external thread of the second end of the full-length screw of the front ring segment until it contacts the bottom of the second bushing of the front ring segment, thereby fixing it. S3. After the front ring segment is fixed, the rear ring segments are assembled in sequence. One end of the shear connection sleeve is installed on the second end of the full-length screw of the front ring segment by a robotic arm. The shear connection sleeve is screwed in so that it contacts the special-shaped locking nut of the front ring segment to secure it. The first end of the full-length screw of the rear ring segment is aligned with the other end of the shear connection sleeve to form a coaxial butt joint. S4, using a full-length screw rotating tool to rotate the second end of the full-length screw of the rear ring segment, so that the first end of the full-length screw of the rear ring segment is screwed into the other end of the shear-resistant connecting sleeve and contacts and fixes with the second end of the full-length screw of the front ring segment; S5. Use a special-shaped locking nut wrench to tighten the special-shaped locking nut on the second end of the full-length screw of the rear ring segment to secure it, thereby completing the longitudinal connection between the front ring segment and the rear ring segment; S6. Repeat steps S3 to S5, continue assembling adjacent rear ring segments at the second end of the aforementioned rear ring segment, and complete the assembly of the series-connected longitudinal assembly until all rear ring segments are assembled into a whole ring.

7. The method for connecting rings of shield segment serial longitudinal connection assemblies according to claim 6, characterized in that: In the above-mentioned S1, before the shield segments are installed, the joints between the through-length screw and the first and second bushings are respectively filled with waterproof materials.

8. The method for connecting rings of shield segment serial longitudinal connection assemblies according to claim 6, characterized in that: When prefabricated, each shield segment is provided with several groups of longitudinal connection components at intervals to form multi-point connections.

9. The method for connecting rings of shield segment serial longitudinal connection assemblies according to claim 6, characterized in that: The step S2 further includes fixing one end of the rubber water stop to a front ring segment sealing groove provided on the front ring segment; The step S3 further includes fixing the other end of the rubber water stop to a rear ring segment sealing groove provided on the rear ring segment; Among them, when repeating steps S3 to S5 to assemble adjacent rear ring segments, one end of the rubber water stop is fixed in the rear ring segment sealing groove set at the other end of the installed rear ring segment, and the other end of the rubber water stop is fixed in the rear ring segment sealing groove set at one end of the newly assembled adjacent rear ring segment.

10. The method for connecting rings of shield segment serial longitudinal connection assemblies according to claim 6, characterized in that: Said S4 also includes the step of squeezing the rubber water stop strip to form a seal when the front ring segment and the rear ring segment, as well as the adjacent rear ring segments, are connected through the series longitudinal connection assembly.

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