Telescopic tunnel lining structure capable of being spliced

Abstract

The utility model provides a splicable telescopic tunnel lining structure which comprises a plurality of arched steel box lining structures spliced in the longitudinal direction of a tunnel. Each arch-shaped steel box lining structure comprises a top sealing block arranged at the arch crown, first shrinkage blocks spliced to the two sides of the top sealing block in the annular direction, two second shrinkage blocks spliced to the bottom ends of the two first shrinkage blocks correspondingly, and two base blocks spliced to the bottom ends of the two second shrinkage blocks correspondingly. The two ends of the top sealing block, the two ends of the first contraction block, the two ends of the second contraction block and the two ends of the base block in the annular direction are open and hollow, the first contraction block is arranged in the top sealing block in the annular direction in a stretchable and contractible mode, the second contraction block is arranged in the base block in the annular direction in a stretchable and contractible mode, and the first contraction block and the second contraction block are connected through a connecting piece. In this way, in the transportation process, the first shrinkage block can be shrunk into the top sealing block, the second shrinkage block can be shrunk into the base block, the structural size in the transportation process can be effectively reduced, and therefore the transportation cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnels, in particular to a splicable telescopic tunnel lining structure. Background Art

[0002] After the excavation of mountain tunnels, the tunnel construction will disturb the surrounding soil mass and cause it to tend to displace towards the free face of the tunnel. In severe cases, soil collapse will occur, causing heavy losses. In order to avoid accidents, different tunnel lining structures are adopted in tunnel engineering to support the soil mass and protect the safety of construction workers.

[0003] Generally, a composite lining structure composed of reinforced concrete is adopted in the tunnel to support the soil mass. During the specific construction, a lining trolley is needed to build a construction platform, and the tunnel lining structure is constructed through the lining trolley. This process requires a large amount of manpower and material resources, and the construction process takes a long time. However, after the tunnel is excavated, the stability of the soil mass is poor. If the time for building the tunnel lining structure is too long, it is easy to occur phenomena such as soil collapse and face instability.

[0004] In view of this, it is necessary to propose a splicable telescopic tunnel lining structure to solve or at least alleviate the above defects. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide a splicable telescopic tunnel lining structure to solve the problems that the existing composite lining structure is time-consuming and laborious, and is prone to phenomena such as soil collapse and face instability.

[0006] To achieve the above object, the utility model provides a splicable telescopic tunnel lining structure, which includes a plurality of arched steel box lining structures spliced in sequence along the longitudinal direction of the tunnel; wherein,

[0007] Each of the arched steel box lining structures includes a capping block arranged at the crown, a first shrinkage block spliced along the circumferential direction on both sides of the capping block, two second shrinkage blocks spliced at the bottom ends of the two first shrinkage blocks respectively, and two base blocks spliced at the bottom ends of the two second shrinkage blocks respectively. The two base blocks are used to be arranged on the concrete cushions on both sides of the tunnel. The circumferential ends of the capping block, the first shrinkage block, the second shrinkage block and the base block are all open and hollow inside. The first shrinkage block is telescopically arranged in the capping block along the circumferential direction, the second shrinkage block is telescopically arranged in the base block along the circumferential direction, and the first shrinkage block and the second shrinkage block are connected by a connecting piece.

[0008] Preferably, first buckles are formed by inward protrusion on the inner walls at both ends of the capping block in the circumferential direction. A first buckle groove corresponding to the first buckles is formed by inward depression on the inner wall of the first shrinkage block. The capping block is fastened to the first shrinkage block through the first buckles being snapped into the first buckle grooves.

[0009] Preferably, second buckles are formed by inward protrusion on the inner wall of one end of the base block close to the second shrinkage block. A second buckle groove corresponding to the second buckles is formed by inward depression on the inner wall of the second shrinkage block. The base block is fastened to the second shrinkage block through the second buckles being snapped into the second buckle grooves.

[0010] Preferably, the connecting member includes a first bolt ring, a second bolt ring and a fastening bolt. A plurality of first bolt grooves are formed by inward depression on the side plate and the bottom plate of the first shrinkage block. The first bolt ring is fixed in the first bolt grooves, and the first bolt ring has a first bolt hole; a plurality of second bolt grooves are formed by inward depression on the side plate and the bottom plate of the second shrinkage block. The second bolt ring is fixed in the second bolt grooves, and the second bolt ring has a second bolt hole corresponding to the first bolt hole. The first shrinkage block is fixedly connected to the second shrinkage block through the fastening bolt sequentially passing through the first bolt hole and the second bolt hole.

[0011] Preferably, each capping block includes a first capping side plate and a second capping side plate oppositely arranged along the longitudinal direction of the tunnel. The first capping side plate protrudes outward to form a capping block slide rail protrusion, and the second capping side plate is recessed inward to form a capping block slide rail groove. The sealing top plate between two adjacent arched steel box lining structures is spliced with each other through the capping block slide rail protrusion being snapped into the capping block slide rail groove.

[0012] Preferably, each base block includes a first base side plate and a second base side plate oppositely arranged along the longitudinal direction of the tunnel. The first base side plate protrudes outward to form a base block slide rail protrusion, and the second base side plate is recessed inward to form a base block slide rail groove. The base blocks between two adjacent arched steel box lining structures are spliced with each other through the base block slide rail protrusion being snapped into the base block slide rail groove.

[0013] Preferably, the top plates of the capping block, the first shrinkage block, the second shrinkage block and the base block are all made of corrugated steel plates.

[0014] Preferably, a plurality of grouting holes are formed in the top plates and bottom plates of the capping block, the first shrinkage block, the second shrinkage block and the base block.

[0015] Preferably, it further includes a waterproof rubber strip, which is arranged on the outer walls of the side plates of the first shrinkage block and the second shrinkage block.

[0016] Preferably, the capping block, the first shrinkage block, the second shrinkage block and the base block are all filled with C45 concrete.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] A splicable telescopic tunnel lining structure provided by the present utility model includes a plurality of arched steel box lining structures spliced in sequence along the longitudinal direction of the tunnel. Each arched steel box lining structure includes a capping block arranged at the crown and a first shrinkage block spliced on both sides of the capping block along the circumferential direction, two second shrinkage blocks spliced at the bottom ends of the two first shrinkage blocks respectively, and two base blocks spliced at the bottom ends of the two second shrinkage blocks respectively. Both ends of the capping block, the first shrinkage block, the second shrinkage block and the base block are open along the circumferential direction and are hollow inside. The first shrinkage block is telescopically arranged in the capping block along the circumferential direction, the second shrinkage block is telescopically arranged in the base block along the circumferential direction, and the first shrinkage block and the second shrinkage block are connected by a connecting piece. In this way, the first shrinkage block can be shrunk into the capping block and the second shrinkage block can be shrunk into the base block during transportation, which can effectively reduce the structural volume during transportation, thereby reducing the transportation cost. During installation, the first shrinkage block and the second shrinkage block are extended and spliced in a short time, which greatly shortens the construction time on the premise of ensuring the initial support capacity, and can also reduce the use of lining trolleys, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 It is a front elevation view of the arched steel box lining structure in an embodiment of the present utility model;

[0021] Figure 2 It is a cross-sectional view of the capping block in an embodiment of the present utility model;

[0022] Figure 3 It is a cross-sectional view of the first shrinkage block in an embodiment of the present utility model;

[0023] Figure 4 It is a cross-sectional view of the second shrinkage block in an embodiment of the present utility model;

[0024] Figure 5 Cross-sectional schematic view of the base block in an embodiment of the present utility model;

[0025] Figure 6 Developed plane schematic view of the arched steel box lining structure in an embodiment of the present utility model;

[0026] Figure 7 Elevation schematic view of the application scenario of the overall structure in an embodiment of the present utility model;

[0027] Figure 8 Schematic view of the first buckle and the first buckle groove in an embodiment of the present utility model.

[0028] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings.

[0029] Explanation of the reference numerals in the drawings:

[0030] 10. Arched steel box lining structure; 110. Capping block; 111. First buckle; 112. First buckle groove; 113. First capping side plate; 114. Second capping side plate; 115. Capping block slide rail protrusion; 116. Capping block slide rail groove; 120. First contraction block; 130. Second contraction block; 140. Base block; 141. Second buckle; 142. Second buckle groove; 143. First base side plate; 144. Second base side plate; 145. Base block slide rail protrusion; 146. Base block slide rail groove; 150. Grouting hole; 160. Waterproof rubber strip; 20. Connecting piece; 210. First bolt ring; 211. First bolt groove; 220. Second bolt ring; 221. Second bolt groove. Detailed implementation manners

[0031] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, the descriptions involving "first", "second", etc. in the present utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0035] Please refer to the attached Figure 1-8 , a splicable telescopic tunnel lining structure in an embodiment provided by the present utility model includes a plurality of arched steel box lining structures 10 spliced in sequence along the longitudinal direction of the tunnel. First of all, it should be noted that the longitudinal direction in this application refers to the extension direction of the tunnel, and the circumferential direction refers to the arched ring along the cross-section of the tunnel; different from the composite lining structure in the prior art for supporting the soil body, during specific construction, a lining trolley is required to build a construction platform, and the tunnel lining structure is built through the lining trolley. This process requires a large amount of manpower and material resources and takes a long time. However, after the tunnel is excavated, the stability of the soil body is poor. If the time for building the tunnel lining structure is too long, it is easy to occur phenomena such as soil collapse and face instability. The present application solves the above defects in the prior art by setting a splicable telescopic tunnel lining structure. Specifically as follows:

[0036] Each of the arched steel box lining structures 10 includes a capping block 110 arranged at the crown, a first shrinking block 120 spliced along the circumferential direction on both sides of the capping block 110, two second shrinking blocks 130 respectively spliced at the bottom ends of the two first shrinking blocks 120, and two base blocks 140 respectively spliced at the bottom ends of the two second shrinking blocks 130. The two base blocks 140 are used to be respectively arranged on the concrete cushions on both sides of the tunnel. The circumferential ends of the capping block 110, the first shrinking block 120, the second shrinking block 130, and the base block 140 are all open and hollow inside. The first shrinking block 120 is telescopically arranged in the capping block 110 along the circumferential direction, the second shrinking block 130 is telescopically arranged in the base block 140 along the circumferential direction, and the first shrinking block 120 and the second shrinking block 130 are connected by a connecting member 20.

[0037] Specifically, the spliceable telescopic tunnel lining structure in the present application includes a plurality of arched steel box lining structures 10. The plurality of arched steel box lining structures 10 are sequentially spliced along the longitudinal direction of the tunnel to form a primary support structure, providing primary support capacity for the soil around the tunnel.

[0038] Among them, each arched steel box lining structure 10 includes a capping block 110, two first shrinkage blocks 120, two second shrinkage blocks 130, and two base blocks 140. The base block 140 serves as the support base of the entire support structure and is fixedly installed on the concrete cushions on both sides of the tunnel. The capping block 110 serves as the top support structure of the entire arched steel box lining structure 10. The first shrinkage blocks 120 and the second shrinkage blocks 130 are connected between the capping block 110 and the base block 140 to support the soil. In this way, an arched steel box lining structure 10 with a downward opening is formed by enclosing among the capping block 110, the two first shrinkage blocks 120, the two second shrinkage blocks 130, and the two base blocks 140.

[0039] Furthermore, both ends of the capping block 110, the first shrinkage block 120, the second shrinkage block 130, and the base block 140 in the circumferential direction are open and hollow inside. In this way, it is convenient for the first shrinkage block 120 to move out / contract along the circumferential direction. Thus, during transportation, the first shrinkage block 120 is contracted into the interior of the capping block 110, and when it is necessary to install it into a lining structure, the first shrinkage block 120 is pulled out in a direction away from the capping block 110 to facilitate connection with the second shrinkage block 130. Similarly, during transportation, the second shrinkage block 130 is contracted into the interior of the base block 140, and when it is necessary to install it into a lining structure, the second shrinkage block 130 is pulled out in a direction away from the base block 140 to facilitate connection with the first shrinkage block 120. In this way, the structural volume during transportation is greatly reduced, the occupied space is reduced, and the transportation cost is saved. Among them, after both the first shrinkage block 120 and the second shrinkage block 130 are pulled out until they abut against each other, they are firmly connected by a connecting member 20 to form the arched steel box lining structure 10.

[0040] As a preferred embodiment of the present utility model, first buckles 111 are inwardly convexly formed on the inner walls of both ends of the capping block 110 in the circumferential direction, and first buckle grooves 112 corresponding to the first buckles 111 are recessed on the inner wall of the first shrinkage block 120. The capping block 110 is fixedly connected to the first shrinkage block 120 by arranging the first buckles 111 in the first buckle grooves 112.

[0041] It should be noted that the function of the first buckle 111 is to prevent the first shrinkage block 120 from falling due to excessive pulling out when being pulled out from the capping block 110. Therefore, a first buckle groove 112 corresponding to the first buckle 111 is formed by recessing the inner wall of the first shrinkage block 120, so as to be easily clamped with the first buckle 111. It is worth mentioning that the corresponding setting here means that the size, shape and position of the first buckle groove 112 match those of the first buckle 111, so that after the first shrinkage block 120 is pulled out to the end of the capping block 110, it is clamped in the first buckle groove 112 by the first buckle 111 to achieve the effect of limiting connection, and the connection tightness between the capping block 110 and the first shrinkage block 120 during support can also be enhanced by the first buckle 111.

[0042] As a relatively preferred embodiment of the present utility model, a second buckle 141 is formed by inwardly protruding the inner wall of one end of the base block 140 close to the second shrinkage block 130, and a second buckle groove 142 corresponding to the second buckle 141 is formed by recessing the inner wall of the second shrinkage block 130. The base block 140 is fixedly connected to the second shrinkage block 130 by clamping the second buckle 141 in the second buckle groove 142.

[0043] It can be understood that, similar to the first buckle 111, the function of the second buckle 141 is to prevent the second shrinkage block 130 from protruding from the base block 140 due to excessive pulling out when being pulled out from the base block 140. Therefore, a second buckle groove 142 corresponding to the second buckle 141 is formed by recessing the inner wall of the second shrinkage block 130, so as to be easily clamped with the second buckle 141. Similarly, the corresponding setting here means that the size, shape and position of the second buckle groove 142 match those of the second buckle 141, so that after the second shrinkage block 130 is pulled out to the top of the base block 140, it is clamped in the second buckle groove 142 by the second buckle 141 to achieve the effect of limiting connection, and the connection tightness between the base block 140 and the second shrinkage block 130 during support can also be enhanced by the second buckle 141.

[0044] As a preferred embodiment of the present utility model, the connecting member 20 includes a first bolt ring 210, a second bolt ring 220 and a fastening bolt (not shown in the figure). The side plate and the bottom plate of the first shrinkage block 120 are recessed inwardly to form a plurality of first bolt grooves 211. The first bolt ring 210 is fixed in the first bolt grooves 211, and the first bolt ring 210 has a first bolt hole (not marked in the figure). The side plate and the bottom plate of the second shrinkage block 130 are recessed inwardly to form a plurality of second bolt grooves 221. The second bolt ring 220 is fixed in the second bolt grooves 221, and the second bolt ring 220 has a second bolt hole (not marked in the figure) corresponding to the first bolt hole. The first shrinkage block 120 is fixedly connected to the second shrinkage block 130 by the fastening bolt passing through the first bolt hole and the second bolt hole in sequence.

[0045] It should be noted that the first bolt ring 210 is used for connecting the first shrinkage block 120. By forming a first bolt hole extending circumferentially on the first bolt ring 210 for facilitating bolt connection, in order to install the first bolt ring 210, a plurality of first bolt grooves 211 need to be recessed inwardly on both the side plate and the bottom plate of the first shrinkage block 120, so that the first bolt ring 210 is fixed in the first bolt grooves 211. Similarly, in order to cooperate with the connection between the second shrinkage block 130 and the first shrinkage block 120, a second bolt ring 220 with a second bolt hole is provided on the second shrinkage block 130. At the same time, a plurality of second bolt grooves 221 are recessed inwardly on both the side plate and the bottom plate of the second shrinkage block 130 in advance for fixing the second bolt ring 220 in the second bolt grooves 221. Among them, the second bolt hole and the first bolt hole are arranged correspondingly. Here, the corresponding arrangement means that the diameters of the first bolt hole and the second bolt hole are the same and they are coaxially arranged when the two holes are corresponding. Synchronously, the opening positions of the first bolt grooves 211 and the second bolt grooves 221 are corresponding, and the installation positions of the first bolt ring 210 and the second bolt ring 220 are corresponding. After the first shrinkage block 120 and the second shrinkage block 130 are both pulled out to the target positions, the first bolt hole and the second bolt hole are aligned. At this time, the fastening bolt is passed through to fixedly connect the first shrinkage block 120 and the second shrinkage block 130.

[0046] As a preferred embodiment of the present utility model, each of the capping blocks 110 includes a first capping side plate 113 and a second capping side plate 114 that are oppositely arranged along the longitudinal direction of the tunnel. The first capping side plate 113 protrudes outward to form a capping block slide rail protrusion 115, and the second capping side plate 114 is recessed inward to form a capping block slide rail groove 116. The capping plates between two adjacent arched steel box lining structures 10 are spliced with each other by clamping the capping block slide rail protrusion 115 into the capping block slide rail groove 116.

[0047] It should be noted that the capping blocks 110, the first contraction blocks 120, the second contraction blocks 130, and the base blocks 140 in this application are all made of steel box structures that are hollow inside and open at both circumferential ends. Therefore, they are all formed by enclosing a top plate, side plates, and a bottom plate. Thus, each of the capping blocks 110 includes a first capping side plate 113 and a second capping side plate 114 that are oppositely arranged along the longitudinal direction of the tunnel. Since the entire splicable telescopic tunnel lining structure includes a plurality of arched steel box lining structures 10 that are sequentially spliced longitudinally, the capping plates of two adjacent arched steel box lining structures can be connected by slide rails. Specifically, the first capping side plate 113 protrudes outward to form a capping block slide rail protrusion 115, and the second capping side plate 114 is recessed inward to form a capping block slide rail groove 116. In this way, along the longitudinal direction of the tunnel, the capping block slide rail protrusion 115 of one capping plate is clamped into the capping block slide rail groove 116 of another capping plate, thereby completing the longitudinal splicing.

[0048] Furthermore, each of the base blocks 140 includes a first base side plate 143 and a second base side plate 144 that are oppositely arranged along the longitudinal direction of the tunnel. The first base side plate 143 protrudes outward to form a base block slide rail protrusion 145, and the second base side plate 144 is recessed inward to form a base block slide rail groove 146. The base blocks 140 between two adjacent arched steel box lining structures 10 are spliced with each other by clamping the base block slide rail protrusion 145 into the base block slide rail groove 146.

[0049] It should be noted that similar to the capping blocks 110, the base blocks 140 can also be connected by slide rails. Therefore, the first base side plate 143 of the base block 140 protrudes outward to form a base block slide rail protrusion 145, and the second base side plate 144 is recessed inward to form a base block slide rail groove 146. In this way, along the longitudinal direction of the tunnel, the base block slide rail protrusion 145 of one base block 140 is clamped into the base block slide rail groove 146 of another base block 140, thereby completing the longitudinal splicing.

[0050] Furthermore, the top plates of the capping blocks 110, the first contraction blocks 120, the second contraction blocks 130, and the base blocks 140 are all made of corrugated steel plates.

[0051] It should be understood that since the top plates are all in direct contact with the inner wall of the surrounding rock, the use of corrugated steel plates has higher strength and load-bearing capacity than ordinary steel plates, and has strong corrosion resistance and good durability.

[0052] Furthermore, a plurality of grouting holes 150 are provided in the top plates and bottom plates of the capping block 110, the first shrinkage block 120, the second shrinkage block 130 and the base block 140.

[0053] It should be noted that the grouting holes 150 in the top plate are used to inject foamed concrete between the top plate and the inner wall of the surrounding rock, while the grouting holes 150 in the bottom plate are used to inject concrete into the capping block 110, the first shrinkage block 120, the second shrinkage block 130 and the base block 140 to improve the load-bearing capacity and structural strength; preferably, C45 concrete can be filled, and those skilled in the art can also make selections according to needs.

[0054] Furthermore, a waterproof rubber strip 160 is further included, and the waterproof rubber strip 160 is disposed on the outer walls of the side plates of the first shrinkage block 120 and the second shrinkage block 130.

[0055] It should be noted that the waterproof rubber strip is used to isolate water vapor and moisture to ensure the dryness inside the structure, and can also isolate the water in the tunnel surrounding rock to prevent the fissure water in the surrounding rock from entering the tunnel; therefore, waterproof rubber strips 160 can also be provided around the capping block 110 and the base block 140.

[0056] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A splicable telescopic tunnel lining structure, characterized in that: It includes multiple arched steel box lining structures spliced ​​in sequence along the longitudinal direction of the tunnel; Each of the arched steel box lining structures includes a capping block arranged at the arch top, a first shrinking block spliced ​​on both sides of the capping block along the circumferential direction, two second shrinking blocks spliced ​​at the bottom ends of the two first shrinking blocks, and two base blocks spliced ​​at the bottom ends of the two second shrinking blocks. The two base blocks are used to be respectively arranged on the concrete cushion layers on both sides of the tunnel. The capping block, the first shrinking block, the second shrinking block and the base block are all opened at both ends along the circumferential direction and are hollow inside. The first shrinking block can be extended and contracted in the capping block along the circumferential direction, and the second shrinking block can be extended and contracted in the base block along the circumferential direction. The first shrinking block and the second shrinking block are connected by a connecting piece.

2. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: The inner walls at both ends of the capping block along the annular direction are protruding inward to form a first buckle, and the inner wall of the first shrinking block is recessed to form a first buckle groove corresponding to the first buckle, and the capping block is clamped in the first buckle groove through the first buckle to be fixedly connected to the first shrinking block.

3. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: The inner wall of one end of the base block close to the second shrinking block is convexly provided with a second buckle, and the inner wall of the second shrinking block is concavely provided with a second buckle groove corresponding to the second buckle, and the base block is clamped in the second buckle groove through the second buckle to be fixedly connected with the second shrinking block.

4. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: The connecting member includes a first bolt ring, a second bolt ring and a fastening bolt. The side plate and the bottom plate of the first shrink block are recessed inward to form a plurality of first bolt grooves. The first bolt ring is fixed in the first bolt groove, and the first bolt ring has a first bolt hole. The side plate and the bottom plate of the second shrink block are recessed inward to form a plurality of second bolt grooves. The second bolt ring is fixed in the second bolt groove, and the second bolt ring has a second bolt hole arranged corresponding to the first bolt hole. The first shrink block is fixedly connected to the second shrink block by the fastening bolt that penetrates the first bolt hole and the second bolt hole in sequence.

5. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: Each of the capping blocks includes a first capping side plate and a second capping side plate which are arranged opposite to each other in the longitudinal direction of the tunnel. The first capping side plate is protruded outward to form a capping block slide rail protrusion, and the second capping side plate is recessed inward to form a capping block slide rail groove. The capping plates between two adjacent arched steel box lining structures are clamped in the capping block slide rail groove through the capping block slide rail protrusion to be spliced ​​with each other.

6. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: Each of the base blocks includes a first base side plate and a second base side plate which are arranged opposite to each other in the longitudinal direction of the tunnel. The first base side plate is protruded outward to form a base block slide rail protrusion, and the second base side plate is recessed inward to form a base block slide rail groove. The base blocks between two adjacent arched steel box lining structures are clamped in the base block slide rail groove through the base block slide rail protrusion to be spliced ​​with each other.

7. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: The top plates of the capping block, the first shrinking block, the second shrinking block and the base block are all made of corrugated steel plates.

8. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: The top plate and the bottom plate of the capping block, the first shrinking block, the second shrinking block and the base block are all provided with a plurality of grouting holes.

9. The splicable telescopic tunnel lining structure according to claim 1, characterized in that: It also includes a waterproof rubber strip, which is arranged on the outer walls of the side panels of the first shrinking block and the second shrinking block.

10. The splicable telescopic tunnel lining structure according to claim 8, characterized in that: The capping block, the first shrinkage block, the second shrinkage block and the base block are all filled with C45 concrete.

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