Shield segment socket type connecting structure and construction method

Abstract

The invention relates to a shield segment socket type connecting structure and a construction method. A standard segment system comprises standard blocks, and the multiple standard blocks are spliced through a segment self-locking system; the adjacent segment systems are assembled at the two ends of the standard segment system through the segment self-locking systems, and the capping segment system is installed between the two adjacent segment systems. The adjacent single-ring pipe pieces are spliced through the pipe piece self-locking system in the longitudinal direction. The duct piece self-locking system has the beneficial effects that the duct piece self-locking system adopts the socket type connecting structure to connect the duct pieces, a traditional bolt connecting mode is replaced, the connecting mode is high in construction speed and easy and convenient to operate, external tools are not needed, time and labor cost are saved, and the duct piece connecting efficiency and reliability are improved; the integral bearing capacity of the duct piece structure can be improved, and the use requirements in different environments can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to a shield segment socket-and-spigot connection structure and a construction method. Background Art

[0002] Shield construction is an advanced method of tunnel excavation underground, which is widely used in urban subway, municipal pipeline, underwater tunnel and other engineering construction. During the advancement of the shield machine, the tunnel lining structure is formed by assembling segments. As the main supporting structure of the shield tunnel, the segment connection structure is crucial to the stability, waterproofness and durability of the entire tunnel. With the acceleration of urbanization and the increasing demand for underground space development, the number of shield tunnel projects is increasing, and the performance requirements for the segment connection structure are also increasing.

[0003] In early shield tunnel projects, traditional bolt connections were used. Bolt holes were reserved on the segments and adjacent segments were connected together using high-strength bolts. This connection method can provide high connection strength and can withstand various loads during the construction and use of the tunnel, such as soil pressure and groundwater pressure. However, bolt connections also have some limitations. On the one hand, the installation of bolts requires a large operating space, which increases the difficulty of construction in some small-diameter shield tunnels or when space is limited. On the other hand, bolts are prone to corrosion in a humid underground environment for a long time, affecting the reliability and durability of the connection. Moreover, bolt connections may become loose under special working conditions such as earthquakes, reducing the overall stability of the tunnel. It requires multiple people to use tools such as wrenches to operate, which is inefficient and inconvenient to operate. Another method is the mortise and tenon connection method. The mortise and tenon connection uses the tenon and the mortise on the segment to cooperate with each other to achieve connection. This connection method has a certain positioning function and can improve the assembly accuracy of the segment during assembly. At the same time, it can reduce the dependence on bolts and other connectors to a certain extent, making the segment connection simpler. However, the bearing capacity of the mortise and tenon connection is relatively limited. Under high pressure, the tenon or the mortise may be damaged. Moreover, its waterproof performance mainly depends on the sealing material between the mortise and tenon. If the sealing material is aged or damaged, leakage problems are likely to occur. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a shield segment socket-and-spigot connection structure and a construction method.

[0005] The shield segment socket-type connection structure comprises a single ring segment including: a segment self-locking system, a standard segment system, an adjacent segment system and a capping segment system; the standard segment system comprises a standard block, and several standard blocks are spliced ​​by the segment self-locking system; the adjacent segment system is assembled at both ends of the standard segment system by the segment self-locking system, and the capping segment system is installed between two adjacent segment systems; adjacent single ring segments are spliced ​​longitudinally by the segment self-locking system;

[0006] Among them, the self-locking system of the pipe segment includes a slot and a prefabricated latch component; the slot is symmetrically provided with a slide groove along the circumferential direction of the pipe segment, and an embedded block, a spring, a movable slider and a limit block are arranged in sequence in the slide groove toward the center of the slot; a reserved grouting pipe is provided in the center of the prefabricated latch component, one end of the reserved grouting pipe extends along the longitudinal direction of the pipe segment, and the other end is connected to the reserved grouting port on the inner wall of the pipe segment; the prefabricated latch component is provided with a groove corresponding to the shape of the end of the limit block on the circumferential direction.

[0007] Preferably, the limit block comprises a side baffle and a trapezoidal end head, the side baffle plate is in contact with the inner wall of the slide slot, the trapezoidal end head is exposed in the slot, and the inclined surface of the trapezoidal end head faces the entrance end of the slot.

[0008] Preferably, the top end of the embedded block and the bottom end of the movable slider are further provided with spring connecting ends, and the upper and lower ends of the spring are respectively clamped on the spring connecting ends of the embedded block and the movable slider.

[0009] Preferably, the length of the prefabricated pin component is consistent with the depth of the slot, and the prefabricated pin component also includes a pin end, a pin middle and a pin tail; the pin end is in the shape of a truncated cone, the angle of the truncated cone is consistent with the trapezoidal end, the upper base diameter of the truncated cone is consistent with the distance between the trapezoidal ends on both sides, and the lower base diameter is smaller than the width of the slot; the middle part of the pin is cylindrical, and the width of the middle part of the pin is smaller than the width of the slot; the tail of the pin is a cube, and the width of the tail of the pin is consistent with the width of the slot.

[0010] The construction method of the shield segment socket-type connection structure comprises the following steps:

[0011] Step 1: Connect several standard blocks along the annular direction through the segment self-locking system to form a standard segment system;

[0012] Step 2: Connect the standard segment system and the adjacent segment system along the annular direction through the segment self-locking system;

[0013] Step 3: Connect the capping block and the adjacent pipe segment system through the bolt holes along the annular direction with arc bolts to complete the assembly of the single-ring segment;

[0014] Step 4: Repeat steps 1 to 3 to complete the splicing of the next ring of single-ring segments, and push them together along the longitudinal direction to complete the assembly with the previous ring of single-ring segments.

[0015] Preferably, the standard segment system comprises a standard block, which is provided with two groups of segment self-locking systems along the circumferential and longitudinal side walls respectively; the capping segment system comprises a capping block, which is provided with a group of segment self-locking systems along the longitudinal side walls and bolt holes along the circumferential side walls; the adjacent segment system comprises an adjacent block, which is provided with a group of segment self-locking systems along the longitudinal side walls and segment self-locking systems and bolt holes along the circumferential side walls, wherein the segment self-locking systems are used to connect with the standard blocks, and the bolt holes are used to connect with the capping blocks.

[0016] Preferably, the method further includes injecting grout through a reserved grouting port and a reserved grouting pipe on the inner side of the pipe segment to fill the gap between the slot and the prefabricated latch component, thereby completing the gap sealing of the pipe segment self-locking system.

[0017] Preferably, it also includes constructing a water-stopping sealing structure when the standard blocks, adjacent blocks and capping blocks are spliced ​​together.

[0018] The beneficial effects of the present invention are:

[0019] 1) The segment self-locking system of the present invention adopts a socket-type connection structure to connect the segments, replacing the traditional bolt connection method. This type of connection method has a fast construction speed, simple and convenient operation, and does not require the use of external tools, saving time and labor costs, improving the efficiency and reliability of segment connection, and can improve the overall bearing capacity of the segment structure, and can meet the requirements of use in different environments.

[0020] 2) The segment self-locking system of the present invention is provided with grouting pipes and grouting ports, so that the gap between the slot and the prefabricated latch member can be quickly filled by grouting. Compared with the ordinary mortise and tenon structure, the connection member after grouting becomes a whole, thereby enhancing the overall stability of the segment connection.

[0021] 3) The prefabricated latch member of the present invention can withstand the shear force generated by the misalignment of the pipe segments, replaces the function of traditional bolts, improves the strength of the pipe segment connection, and ensures the quality of the pipe segment connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the segment self-locking system in the separated state;

[0023] Figure 2 It is a three-dimensional schematic diagram of the slot in the segment self-locking system;

[0024] Figure 3 It is a three-dimensional schematic diagram of the interior of the slideway in the segment self-locking system;

[0025] Figure 4 It is a three-dimensional schematic diagram of the prefabricated latch component in the segment self-locking system;

[0026] Figure 5 This is a schematic diagram after the single ring segment is assembled;

[0027] Figure 6 is a three-dimensional schematic diagram of a standard block;

[0028] Figure 7 It is a schematic diagram of the standard blocks connected by the segment self-locking system;

[0029] Figure 8 is a three-dimensional schematic diagram of adjacent blocks;

[0030] Fig. 9 It is a three-dimensional schematic diagram of the capping block;

[0031] Fig.10 Schematic diagram of the gap sealing of the segment self-locking system.

[0032] In the figure: 1-slot; 2-limiting block; 2-1-side baffle; 2-2-trapezoidal end; 3-movable slider; 4-embedded block; 5-spring; 6-prefabricated latch component; 6-1 latch end; 6-2 latch middle; 6-3 latch tail; 7-reserved grouting port; 8-reserved grouting pipe; 9-slide; 10-standard block; 11-adjacent block; 12-slurry; 13-bolt hole; 14-capping block; 15-spring connection end. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0034] Embodiment 1

[0035] As an example, Figures 1 to 10 As shown, this shield segment socket connection structure, the single ring segment includes: segment self-locking system, standard segment system, adjacent segment system and capping segment system.

[0036] like Figure 5 As shown, the standard segment system includes a standard block 10, and several standard blocks 10 are spliced ​​by the segment self-locking system; the adjacent segment systems are assembled at both ends of the standard segment system by the segment self-locking system, and the capping segment system is installed between the two adjacent segment systems; the adjacent single-ring segments are spliced ​​longitudinally by the segment self-locking system;

[0037] like Figure 1As shown, the segment self-locking system includes a slot 1 and a prefabricated latch component 6; the slot 1 is symmetrically provided with a slide groove 9 along the circumferential direction of the segment, and an embedded block 4, a spring 5, a movable slider 3 and a limit block 2 are arranged in sequence in the slide groove 9 toward the center of the slot 1; a reserved grouting pipe 8 is provided at the center of the prefabricated latch component 6, one end of the reserved grouting pipe 8 extends along the longitudinal direction of the segment, and the other end is connected to the reserved grouting port 7 on the inner wall of the segment; the prefabricated latch component 6 is provided with a groove corresponding to the shape of the end of the limit block 2 on the circumferential direction.

[0038] like Figures 6 to 9 As shown, the standard segment system includes a standard block 10, and the standard block 10 is provided with two groups of segment self-locking systems along the circumferential and longitudinal side walls respectively; the capping segment system includes a capping block 14, and the capping block 14 is provided with a group of segment self-locking systems along the longitudinal side wall, and a bolt insertion hole 13 is provided along the circumferential side wall; the adjacent segment system includes an adjacent block 11, and the adjacent block 11 is provided with a group of segment self-locking systems along the longitudinal side wall, and a segment self-locking system and a bolt insertion hole 13 are provided along the circumferential side wall, wherein the segment self-locking system is used to connect with the standard block 10, and the bolt insertion hole 13 is used to connect with the capping block 14.

[0039] Embodiment 2

[0040] As another embodiment, this embodiment 2 proposes a more specific shield segment socket-type connection structure based on the embodiment 1, and the structure of the slot 1 and the prefabricated latch member 6 is specifically as follows:

[0041] like Figure 2 As shown, the limit block 2 includes a side baffle 2-1 and a trapezoidal end head 2-2, the side baffle 2-1 is in contact with the inner wall of the slide groove 9, the trapezoidal end head 2-2 is exposed in the slot 1, and the inclined surface of the trapezoidal end head 2-2 faces the entrance end of the slot 1.

[0042] like Figure 3 As shown, a spring connecting end 15 is further provided at the top of the embedded block 4 and the bottom of the movable slider 3 , and the upper and lower ends of the spring 5 are respectively clamped on the spring connecting ends 15 of the embedded block 4 and the movable slider 3 .

[0043] like Figure 4As shown, the length of the prefabricated plug component 6 is consistent with the depth of the slot 1, and the prefabricated plug component 6 also includes a plug end 6-1, a plug middle 6-2 and a plug tail 6-3; the plug end 6-1 is in the shape of a truncated cone, and the angle of the truncated cone is consistent with the trapezoidal end 2-2. This design can reduce friction and ensure that the prefabricated plug component 6 can be quickly inserted during installation. The upper base diameter of the truncated cone shape is consistent with the distance between the trapezoidal ends 2-2 on both sides, and the lower base diameter is smaller than the width of the slot 1; the plug middle 6-2 is cylindrical, and the width of the plug middle 6-2 is smaller than the width of the slot 1; the plug tail 6-3 is a cube, and the width of the plug tail 6-3 is consistent with the width of the slot 1.

[0044] The movable slider 3 and the embedded block 4 are both provided with a spring connection end 15 for fixing the spring 5 to prevent it from being misplaced. In the absence of external pressure, the spring 5 is in a natural state, at which time the side baffle 2-1 fits the slide groove 9, and the trapezoidal end 2-2 is exposed in the slot 1.

[0045] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0046] Embodiment 3

[0047] As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, that the construction method of the shield segment socket connection structure comprises the following steps:

[0048] Step 1: Connect several standard blocks 10 along the annular direction through the segment self-locking system to form a standard segment system;

[0049] Step 2: Connect the standard segment system and the adjacent segment system along the annular direction through the segment self-locking system;

[0050] Step 3: Connect the capping block 14 and the adjacent pipe segment system through the bolt insertion hole 13 along the annular direction with arc-shaped bolts to complete the assembly of the single-ring pipe segment;

[0051] Step 4: Repeat steps 1 to 3 to complete the splicing of the next ring of single-ring segments, and push them longitudinally as a whole to complete the assembly with the previous ring of single-ring segments. As the shield starts to dig, continue to assemble the next ring of segments.

[0052] In step 1 to step 4, during the segment connection operation, the prefabricated latch member 6 moves into the slot 1 under the action of the mechanical arm, and the latch end 6-1 contacts the trapezoidal end 2-2, exerting pressure on the stop block 2, causing the spring 5 to shrink and deform, while the movable slider 3 moves inward in the slide slot 9 with the spring 5 compressed. As the latch end 6-1 completely passes through the trapezoidal end 2-2, the cylinder diameter of the middle part 6-2 of the latch is reduced, and it is no longer possible to exert pressure on the stop block 2, and the spring 5 returns to its initial natural state, at which time the trapezoidal end 2-2 is exposed in the slot 1 and is fixed in the middle part 6-2 of the latch.

[0053] After the pipe segments are connected, grouting is performed through the reserved grouting opening 7 and the reserved grouting pipe 8 on the inner side of the pipe segment to fill the gap between the slot 1 and the prefabricated plug member 6. Fig.10 As shown, the prepared slurry is transported to the gap of the segment self-locking system through the reserved grouting port 7 and the reserved grouting pipeline 8, so that the connection part forms an integral structure. This can not only enhance the stability of the connection between the segments, but also effectively improve the shear resistance of the segments and avoid the dislocation of the segments.

[0054] At the same time, water-stop sealing strips are provided when the standard blocks 10, the adjacent blocks 11 and the capping blocks 14 are spliced ​​together to further enhance the waterproof performance of the pipe segments.

[0055] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A shield segment socket connection structure, characterized in that: The single-ring segments include: segment self-locking system, standard segment system, adjacent segment system and capping segment system; the standard segment system includes standard blocks, and several standard blocks are spliced ​​through the segment self-locking system; the adjacent segment system is assembled at both ends of the standard segment system through the segment self-locking system, and the capping segment system is installed between two adjacent segment systems; adjacent single-ring segments are spliced ​​longitudinally through the segment self-locking system; Among them, the self-locking system of the pipe segment includes a slot and a prefabricated latch component; the slot is symmetrically provided with a slide groove along the circumferential direction of the pipe segment, and an embedded block, a spring, a movable slider and a limit block are arranged in sequence in the slide groove toward the center of the slot; a reserved grouting pipe is provided in the center of the prefabricated latch component, one end of the reserved grouting pipe extends along the longitudinal direction of the pipe segment, and the other end is connected to the reserved grouting port on the inner wall of the pipe segment; the prefabricated latch component is provided with a groove corresponding to the shape of the end of the limit block on the circumferential direction.

2. The shield segment socket connection structure according to claim 1, characterized in that: The limit block comprises a side baffle and a trapezoidal end head, wherein the side baffle is fitted with the inner wall of the slide slot, the trapezoidal end head is exposed in the slot, and the inclined surface of the trapezoidal end head faces the entrance end of the slot.

3. The shield segment socket connection structure according to claim 1, characterized in that: The top end of the embedded block and the bottom end of the movable slider are also provided with spring connecting ends, and the upper and lower ends of the spring are respectively clamped on the spring connecting ends of the embedded block and the movable slider.

4. The shield segment socket connection structure according to claim 2, characterized in that: The length of the prefabricated plug component is consistent with the depth of the slot, and the prefabricated plug component also includes a plug end, a plug middle and a plug tail; the plug end is in the shape of a truncated cone, the angle of the truncated cone is consistent with the trapezoidal end, the upper base diameter of the truncated cone is consistent with the distance between the trapezoidal ends on both sides, and the lower base diameter is smaller than the width of the slot; the middle part of the plug is cylindrical, and the width of the middle part of the plug is smaller than the width of the slot; the tail of the plug is a cube, and the width of the tail of the plug is consistent with the width of the slot.

5. The construction method of the shield segment socket connection structure according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Connect several standard blocks along the annular direction through the segment self-locking system to form a standard segment system; Step 2: Connect the standard segment system and the adjacent segment system along the annular direction through the segment self-locking system; Step 3: Connect the capping block and the adjacent pipe segment system through the bolt holes along the annular direction with arc bolts to complete the assembly of the single-ring segment; Step 4: Repeat steps 1 to 3 to complete the splicing of the next ring of single-ring segments, and push them together along the longitudinal direction to complete the assembly with the previous ring of single-ring segments.

6. The construction method of the shield segment socket connection structure according to claim 5, characterized in that: The standard segment system includes a standard block, which is provided with two sets of segment self-locking systems along the circumferential and longitudinal side walls respectively; the capping segment system includes a capping block, which is provided with a set of segment self-locking systems along the longitudinal side walls and bolt insertion holes along the circumferential side walls; the adjacent segment system includes an adjacent block, which is provided with a set of segment self-locking systems along the longitudinal side walls and segment self-locking systems and bolt insertion holes along the circumferential side walls, wherein the segment self-locking systems are used to connect with the standard blocks, and the bolt insertion holes are used to connect with the capping blocks.

7. The construction method of the shield segment socket connection structure according to claim 5, characterized in that: It also includes grouting through the reserved grouting openings and reserved grouting pipes on the inner side of the pipe segment to fill the gaps between the slots and the prefabricated latch components, thereby completing the gap sealing of the pipe segment self-locking system.

8. The construction method of the shield segment socket connection structure according to claim 5, characterized in that: It also includes the construction of water-stopping and sealing structures when standard blocks, adjacent blocks and capping blocks are spliced ​​together.

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