Waterproof structure and construction method of prefabricated lining joints in open-cut tunnels divided into upper and lower blocks

Abstract

The present invention belongs to the technical field of underground structural engineering, and specifically relates to a prefabricated lining joint waterproofing structure and construction method for an open-cut tunnel with upper and lower blocks. The structure comprises a lining ring, which is formed by splicing a prefabricated lining upper block and a prefabricated lining lower block arranged opposite each other. The prefabricated lining upper block and the prefabricated lining lower block each comprise a structural plate and two side walls connected to the ends of the structural plate. The two side walls of the prefabricated lining upper block and the two side walls of the prefabricated lining lower block are respectively connected by a mortise and tenon structure. A side wall waterproofing groove extending longitudinally is provided on the outer side of the tenon on the circumferential joint surface of the side wall provided with the tenon, and a side wall waterproofing strip is adhered to the side wall waterproofing groove. The present invention not only saves waterproofing materials and has high construction quality, but also allows waterproofing construction to achieve a certain process overlap with prefabricated lining assembly, thereby speeding up lining construction and shortening the overall construction period of the open-cut tunnel.

Description

Technical Field

[0001] The invention belongs to the technical field of underground structure engineering, and particularly relates to an open-cut tunnel prefabricated lining joint waterproof structure divided into upper and lower blocks and a construction method. Background Art

[0002] Most cut-and-cover tunnel projects are located below the waterline and are submerged in groundwater during operation. The various gaps between the lining structures create pathways for groundwater leakage. Groundwater leakage in cut-and-cover tunnels for rail transit can pose safety risks to vehicles, communications, and power supply within the tunnel. Leakage points in cut-and-cover tunnels are often located at lining joints. Therefore, addressing the waterproofing of these joints is crucial, especially in cut-and-cover tunnels that utilize prefabricated linings in upper and lower sections with numerous joints.

[0003] Currently, the most common waterproofing method used in cut-and-open tunnels is fully externalized waterproofing. This completely encloses the prefabricated lining, achieving all-around waterproofing. However, this approach results in significant waste of waterproofing materials, especially in projects using prefabricated linings with high water resistance ratings. Furthermore, the application process is complex, making on-site construction quality difficult to control. The splicing of prefabricated lining blocks can easily lead to damage to the waterproofing material, thus failing to achieve the desired waterproofing effect. Summary of the Invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a prefabricated lining joint waterproofing structure and construction method for an open-cut tunnel divided into upper and lower blocks, which not only saves waterproofing materials and has high construction quality, but also the waterproofing construction can be overlapped with the prefabricated lining assembly to a certain extent, thereby speeding up the lining construction speed and shortening the overall construction period of the open-cut tunnel.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is a prefabricated lining joint waterproof structure for an open-cut tunnel with upper and lower blocks, comprising a lining ring, which is spliced ​​by a prefabricated lining upper block and a prefabricated lining lower block arranged opposite to each other in the upper and lower directions; the prefabricated lining upper block and the prefabricated lining lower block both include a structural plate and two side walls connected to the two ends of the structural plate, and the two side walls of the prefabricated lining upper block are connected to the two side walls of the prefabricated lining lower block by a concave-convex tenon structure respectively; a side wall waterproof groove extending in the longitudinal direction is provided on the outer side of the tenon on the circumferential joint surface of the side wall provided with the tenon, and a side wall waterproof rubber strip is pasted in the side wall waterproof groove.

[0006] Furthermore, a middle partition wall is connected to the structural plate, and the middle partition wall is located between the two side walls, and the middle partition wall of the upper block of the prefabricated lining is connected to the middle partition wall of the lower block of the prefabricated lining by a mortise and tenon structure.

[0007] Furthermore, longitudinally extending middle partition wall waterproof grooves are respectively provided on both sides of the tenon on the circumferential joint surface of the middle partition wall provided with the tenon, and middle partition wall waterproof adhesive strips are pasted in the middle partition wall waterproof grooves.

[0008] Furthermore, a circumferential joint glue injection pipe for injecting waterproof glue into the circumferential joint surface of the side wall is pre-buried on the upper block of the prefabricated lining.

[0009] Furthermore, multiple lining rings are spliced ​​longitudinally to form a lining structure, and the structural plates and side walls of adjacent lining rings are respectively connected by a mortise and tenon structure; an annular waterproof groove is provided on the outer side of the tenon on the inter-ring joint surface of the lining ring with the tenon, and the annular waterproof groove is arranged along the structural plates and side walls of the upper block of the prefabricated lining and the structural plates and side walls of the lower block of the prefabricated lining, and an annular waterproof rubber strip is pasted in the annular waterproof groove.

[0010] Furthermore, the annular waterproof rubber strip completely covers the exposed opening of the side wall waterproof groove.

[0011] Furthermore, the middle partition walls of adjacent lining rings are connected by a mortise and tenon structure, and vertical waterproof grooves are respectively arranged on both sides of the tenon on the inter-ring joint surface of the middle partition wall with the tenon, and the upper and lower ends of the vertical waterproof grooves respectively extend into the structural plates of the prefabricated lining upper block and the structural plates of the prefabricated lining lower block and are connected to the annular waterproof grooves in the structural plates; and a vertical waterproof rubber strip is pasted in the vertical waterproof groove, and the two ends of the vertical waterproof rubber strip are respectively connected to the annular waterproof rubber strip.

[0012] Furthermore, the two vertical waterproof rubber strips on the inter-annular joint surface completely cover the exposed openings of the two middle partition wall waterproof grooves on the annular joint surface.

[0013] Furthermore, an inter-ring joint glue injection tube for injecting waterproof glue into the inter-ring joint surface is pre-buried on the inner side of the tenon of the structural plate of the lining ring provided with the tenon.

[0014] The present invention also provides a construction method for the above-mentioned upper and lower block open-cut tunnel prefabricated lining joint waterproof structure, comprising the following steps:

[0015] 1) After transporting the upper and lower prefabricated lining blocks to the tunnel construction site, first apply adhesive to the waterproof grooves on the circumferential joint surfaces of the prefabricated lining blocks. Once the adhesive reaches the required level, apply waterproof strips to the waterproof grooves on the circumferential joint surfaces.

[0016] 2) Assemble the upper and lower prefabricated lining blocks, align the convex and concave tenons between the blocks, and squeeze the waterproof adhesive strips in the waterproof grooves on the circumferential joint surfaces to fill the circumferential joints between the blocks. After assembly, inject waterproof adhesive into the circumferential joints of the side walls through the circumferential joint adhesive injection hose and seal the circumferential joint adhesive injection hose.

[0017] 3) After the circumferential assembly is completed, perform longitudinal splicing between lining rings. Apply adhesive to the inter-ring joint surface of the previous lining ring and in the waterproof groove of the inter-ring joint surface. After the adhesive reaches the required level, affix waterproof tape to the waterproof groove of the inter-ring joint surface and make sure that the waterproof tape completely covers the exposed opening of the waterproof groove of the circumferential joint surface.

[0018] 4) Carry out longitudinal splicing between lining rings. During splicing, align and connect with the previous lining ring through the concave-convex tenon structure and squeeze the waterproof rubber strip in the waterproof groove on the joint surface between the rings to fill the joints between the lining rings. After the splicing is completed, inject waterproof glue into the joints between the rings through the joint glue injection hose and seal the joint glue injection hose.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) Compared with the existing overall outsourcing waterproofing form, the upper and lower block open-cut tunnel prefabricated lining joint waterproofing structure and construction method of the present invention can save waterproofing materials, have higher construction quality, and the waterproofing construction can be overlapped with the prefabricated lining assembly to a certain extent, thereby speeding up the lining construction speed and shortening the overall construction period of the open-cut tunnel;

[0021] (2) The present invention uses three waterproof measures to act on the prefabricated lining joints. The first is to use a mortise and tenon structure to connect the upper block and the lower block of the prefabricated lining and to connect adjacent lining rings, which also serves as a waterproof measure. The second is to stick waterproof strips at the joints as a waterproof measure to ensure the waterproof effect of the joints. The third is to inject waterproof glue into the joints through a glue injection tube after the splicing is completed, which serves as another waterproof measure to further enhance the waterproof effect of the joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a prefabricated lining joint waterproof structure for an open-cut tunnel with upper and lower blocks provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a side wall waterproof groove provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of a waterproof groove in a partition wall provided by an embodiment of the present invention;

[0026] In the figure: 1. Precast lining upper block; 2. Precast lining lower block; 3. Structural plate; 4. Side wall; 5. Middle partition wall; 6. Circumferential joint surface; 7. Side wall waterproof groove; 8. Middle partition wall waterproof groove; 9. Circumferential joint injection hose; 10. Tenon and groove structure; 11. Annular waterproof rubber strip; 12. Vertical waterproof rubber strip; 13. Inter-annular joint injection hose. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features; and in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] like Figure 1-Figure 3As shown, this embodiment provides an open-cut tunnel prefabricated lining joint waterproof structure with upper and lower blocks, including a lining ring, which is spliced ​​by a prefabricated lining upper block 1 and a prefabricated lining lower block 2 arranged opposite to each other in the upper and lower directions; the prefabricated lining upper block 1 and the prefabricated lining lower block 2 both include a structural plate 3 and two side walls 4 connected to the two ends of the structural plate 3, and the two side walls 4 of the prefabricated lining upper block 1 are connected to the two side walls 4 of the prefabricated lining lower block 2 by a concave-convex structure 10 respectively; a side wall waterproof groove 7 extending in the longitudinal direction is provided on the outer side of the tenon on the annular joint surface 6 of the side wall 4 provided with the tenon, and a side wall waterproof tape is pasted in the side wall waterproof groove 7. The mortise and tenon structure 10 of this embodiment is used to connect the prefabricated lining upper block 1 and the prefabricated lining lower block 2, and also serves as a waterproof measure; a side wall waterproof groove 7 is reserved on the outside of the mortise and tenon, and a side wall waterproof tape is pasted in the side wall waterproof groove 7 as a waterproof measure; the two waterproof measures work together at the circumferential joint of the side wall to ensure the waterproof effect of the circumferential joint of the side wall 4.

[0031] Furthermore, a central partition wall 5 is connected to the structural plate 3. The central partition wall 5 is located between the two side walls 4, and the central partition wall 5 of the upper prefabricated lining block 1 is connected to the central partition wall 5 of the lower prefabricated lining block 2 via a mortise and tenon structure 10. Furthermore, longitudinally extending central partition wall waterproof grooves 8 are provided on both sides of the tenon on the circumferential joint surface 6 of the central partition wall 5 provided with the tenon, and central partition wall waterproof adhesive strips are adhered to the central partition wall waterproof grooves 8. The prefabricated lining upper block 1 and the prefabricated lining lower block 2 of this embodiment are M-shaped and W-shaped respectively, and a concave-convex tenon structure 10 is used to connect the middle partition wall 5 of the prefabricated lining upper block 1 and the middle partition wall 5 of the prefabricated lining lower block 2, which also serves as a waterproof measure; a middle partition wall waterproof groove 8 is reserved on both sides of the convex tenon, and a middle partition wall waterproof strip is pasted in the middle partition wall waterproof groove 8 as a waterproof measure; the two waterproof measures act together on the circumferential joint of the middle partition wall 5 to ensure the waterproof effect of the circumferential joint of the middle partition wall 5.

[0032] like Figure 1-3 As shown, the annular mortise and tenon structure 10 in this embodiment includes a convex tenon and a concave tenon, wherein the convex tenon is arranged on the side wall 4 and the middle partition wall 5 of the prefabricated lining lower block 2, and the concave tenon is arranged on the side wall 4 and the middle partition wall 5 of the prefabricated lining upper block 1.

[0033] Furthermore, the prefabricated lining upper block 1 is pre-buried with an annular joint glue injection pipe 9 for injecting waterproof glue into the annular joint surface 6 of the side wall 4. Figure 1As shown, in this embodiment, a pre-buried circumferential joint glue injection tube 9 is extended to the circumferential joint surface 6 of the side wall 4 on the inner side of the prefabricated lining block 1. After the circumferential splicing is completed, waterproof glue is injected into the circumferential joint surface 6 of the side wall 4 through the circumferential joint glue injection tube 9. As a waterproof measure, it works together with the mortise and tenon structure 10 and the waterproof glue strip to further enhance the waterproof effect of the circumferential joint.

[0034] Furthermore, multiple lining rings are spliced ​​longitudinally to form a lining structure, and the structural plates 3 and side walls 4 of adjacent lining rings are connected respectively by a mortise and tenon structure; an annular waterproof groove is provided on the outer side of the tenon on the inter-ring joint surface of the lining ring provided with the tenon, and the annular waterproof groove is arranged along the structural plates 3 and side walls 4 of the prefabricated lining upper block 1 and the structural plates 3 and side walls 4 of the prefabricated lining lower block 2, and an annular waterproof rubber strip 11 is pasted in the annular waterproof groove. This embodiment adopts a mortise and tenon structure to connect adjacent lining rings, and at the same time serves as a waterproof measure; an annular waterproof groove is also reserved on the outer side of the tenon, and the annular waterproof groove is arranged along the side walls and structural plates of the lining ring, such as Figure 1 As shown, an annular waterproof tape 11 is pasted in the annular waterproof groove as a waterproof measure; through the two waterproof measures acting together on the inter-ring joints between the lining rings, the waterproof effect of the inter-ring joints of the lining rings is ensured.

[0035] Furthermore, the annular waterproof strip 11 completely covers the exposed opening of the side wall waterproof groove 7, such as Figure 1 As shown, the portion of the annular waterproof rubber strip 11 arranged along the side wall completely covers the exposed opening of the side wall waterproof groove 7, forming a waterproof method with no dead angles.

[0036] Furthermore, the middle partition walls 5 of the adjacent lining rings are connected by a mortise and tenon structure 10, and vertical waterproof grooves are respectively provided on both sides of the tenon on the inter-ring joint surface of the middle partition wall 5 provided with the tenon, and the upper and lower ends of the vertical waterproof grooves respectively extend into the structural plate 3 of the prefabricated lining upper block 1 and the structural plate 3 of the prefabricated lining lower block 2 and are connected with the annular waterproof groove in the structural plate 3; and a vertical waterproof rubber strip 12 is pasted in the vertical waterproof groove, and the two ends of the vertical waterproof rubber strip 12 are respectively connected with the annular waterproof rubber strip 11. This embodiment adopts a mortise and tenon structure to connect the middle partition walls 5 of the adjacent lining rings, and at the same time serves as a waterproof measure; vertical waterproof grooves are also reserved on both sides of the tenon, and the two ends of the vertical waterproof groove are respectively connected with the annular waterproof groove, such as Figure 1 As shown, a vertical waterproof strip 12 is pasted in the vertical waterproof groove, and the two ends of the vertical waterproof strip are respectively connected to the annular waterproof strip 11 as a waterproof measure; through the two waterproof measures, the inter-ring joints between the middle partition walls 5 are acted together to ensure the waterproof effect of the inter-ring joints of the middle partition walls 5.

[0037] Furthermore, the two vertical waterproof rubber strips 12 on the annular joint surface completely cover the exposed openings of the two middle partition wall waterproof grooves 8 on the annular joint surface 6, as shown in FIG. Figure 1 As shown, the two vertical waterproof strips 12 completely cover the exposed openings of the middle partition wall waterproof groove 8 on both sides of the tenon on the middle partition wall 5, forming a waterproof method without dead angles.

[0038] Furthermore, a ring joint glue injection pipe 13 for injecting waterproof glue into the joint surface between the rings is pre-buried on the inner side of the tenon of the structural plate 3 of the lining ring provided with the tenon. Figure 1 As shown, in this embodiment, an inter-ring joint glue injection tube 13 is embedded on the inner side of the structural plate 3 of the prefabricated lining upper block 1 and the inner side of the structural plate 3 of the prefabricated lining lower block 2 and extends into the corresponding structural plate 3. After the inter-ring splicing is completed, waterproof glue is injected into the inter-ring joint surface between the lining rings through the inter-ring joint glue injection tube 13 as a waterproof measure, which works together with the mortise and tenon structure and the waterproof glue strip to further enhance the waterproof effect of the circumferential joint.

[0039] The side wall waterproofing strips, the middle partition wall waterproofing strips, the annular waterproofing strips 11 and the vertical waterproofing strips 12 in this embodiment are all made of EPDM waterstop strips; and all the waterproofing strips need to be coated with adhesive on the pasting surface before being pasted.

[0040] This embodiment also provides a construction method for the above-mentioned upper and lower block open-cut tunnel prefabricated lining joint waterproof structure, including the following steps:

[0041] 1) After transporting the prefabricated lining upper block 1 and the prefabricated lining lower block 2 to the tunnel construction site, first apply adhesive to the side wall waterproof groove 7 of the circumferential joint surface 6 of the side wall 4 of the prefabricated lining lower block 2 and the middle partition wall waterproof groove 8 of the circumferential joint surface 6 of the middle partition wall 5. After the adhesive reaches the required level, affix side wall waterproofing strips and middle partition wall waterproofing strips to the side wall waterproofing groove 7 and the middle partition wall waterproofing groove 8, respectively;

[0042] 2) Assemble the prefabricated lining upper block 1 and the prefabricated lining lower block 2, align the tenons on the prefabricated lining upper block 1 with the convex tenons on the prefabricated lining lower block 2, and squeeze the side wall waterproof adhesive strips in the side wall waterproof groove 7 and the middle partition wall waterproof adhesive strips in the middle partition wall waterproof groove 8 on the circumferential joint surface 6 so that the waterproof adhesive strips fill the circumferential joints between the blocks. After the assembly is completed, inject waterproof adhesive into the circumferential joints of the side walls 4 through the circumferential joint adhesive injection tube 9 and seal the circumferential joint adhesive injection tube 9 to enhance the waterproof effect between the circumferential joints;

[0043] 3) After the circumferential assembly is completed, the lining rings are longitudinally spliced ​​together. Adhesive is applied to the inter-ring joint surface of the previous lining ring and in the annular waterproof groove and vertical waterproof groove of the inter-ring joint surface. After the adhesive reaches the required adhesion, annular waterproof adhesive strips 11 and vertical waterproof adhesive strips 12 are respectively affixed to the annular waterproof groove and vertical waterproof groove of the inter-ring joint surface of the lining ring, and the annular waterproof adhesive strips 11 and vertical waterproof adhesive strips 12 are respectively made to completely cover the exposed openings of the side wall waterproof groove 7 and the exposed openings of the middle partition wall waterproof groove 8 on the circumferential joint surface 6;

[0044] 4) Carry out longitudinal splicing between lining rings. During splicing, align and connect with the previous lining ring through the concave-convex tenon structure, and squeeze the annular waterproof rubber strip 11 in the annular waterproof groove and the vertical waterproof rubber strip 12 in the vertical waterproof groove on the inter-ring joint surface to fill the inter-ring joints between the lining rings. After splicing is completed, inject waterproof glue into the inter-ring joints through the inter-ring joint glue injection tube 13 and seal the inter-ring joint glue injection tube 13 to enhance the waterproof effect between the inter-ring joints.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated lining joint waterproof structure for an open-cut tunnel divided into upper and lower blocks, characterized by: The invention relates to a lining ring, wherein the lining ring is formed by splicing a prefabricated lining upper block and a prefabricated lining lower block which are arranged opposite to each other; the prefabricated lining upper block and the prefabricated lining lower block each include a structural plate and two side walls connected to both ends of the structural plate, and the two side walls of the prefabricated lining upper block and the two side walls of the prefabricated lining lower block are respectively connected by a concave-convex tenon structure; a side wall waterproof groove extending in the longitudinal direction is provided on the outer side of the tenon on the annular joint surface of the side wall provided with the tenon, and a waterproof groove is pasted in the side wall waterproof groove. Side wall waterproofing strips; the structural plate is also connected to a middle partition wall, the middle partition wall is located between the two side walls, and the middle partition wall of the upper block of the prefabricated lining is connected to the middle partition wall of the lower block of the prefabricated lining by a concave-convex structure; on both sides of the tenon on the annular joint surface of the middle partition wall with the tenon, a middle partition wall waterproofing groove extending in the longitudinal direction is respectively provided, and the middle partition wall waterproofing strips are pasted in the middle partition wall waterproofing groove; multiple rings of the lining ring are spliced ​​longitudinally to form a lining structure, and the structural plates and side wall partitions of adjacent lining rings are connected. The lining rings are connected by a convex-concave structure; an annular waterproof groove is provided on the outer side of the tenon on the inter-ring joint surface of the lining ring provided with the tenon, and the annular waterproof groove is arranged along the structural plate and side wall of the upper block of the prefabricated lining and the structural plate and side wall of the lower block of the prefabricated lining, and an annular waterproof rubber strip is pasted in the annular waterproof groove; the annular waterproof rubber strip completely covers the exposed openings of the side wall waterproof grooves; the middle partition walls of adjacent lining rings are connected by a convex-concave structure, and vertical waterproof grooves are respectively provided on both sides of the tenon on the inter-ring joint surface of the middle partition wall provided with the tenon, and the upper and lower ends of the vertical waterproof grooves respectively extend into the structural plate of the upper block of the prefabricated lining and the structural plate of the lower block of the prefabricated lining and are connected to the annular waterproof grooves in the structural plate; a vertical waterproof rubber strip is pasted in the vertical waterproof groove, and the two ends of the vertical waterproof rubber strip are respectively connected to the annular waterproof rubber strip; the two vertical waterproof rubber strips on the inter-ring joint surface completely cover the exposed openings of the two middle partition wall waterproof grooves on the annular joint surface.

2. The upper and lower block open-cut tunnel prefabricated lining joint waterproof structure according to claim 1, characterized in that: The upper blocks of the prefabricated lining are pre-buried with circumferential joint glue injection pipes for injecting waterproof glue into the circumferential joint surfaces of the side walls.

3. The upper and lower block open-cut tunnel prefabricated lining joint waterproof structure according to claim 1, characterized in that: An inter-ring joint glue injection pipe for injecting waterproof glue into the inter-ring joint surface is pre-buried on the inner side of the tenon of the structural plate of the lining ring provided with the tenon.

4. A construction method for a prefabricated lining joint waterproof structure for an open-cut tunnel with upper and lower blocks as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: 1) After transporting the upper and lower prefabricated lining blocks to the tunnel construction site, first apply adhesive to the waterproof grooves on the circumferential joint surfaces of the prefabricated lining blocks. Once the adhesive reaches the required level, apply waterproof strips to the waterproof grooves on the circumferential joint surfaces. 2) Assemble the upper and lower prefabricated lining blocks, align the convex and concave tenons between the blocks, and squeeze the waterproof adhesive strips in the waterproof grooves on the circumferential joint surfaces to fill the circumferential joints between the blocks. After assembly, inject waterproof adhesive into the circumferential joints of the side walls through the circumferential joint adhesive injection hose and seal the circumferential joint adhesive injection hose. 3) After the circumferential assembly is completed, perform longitudinal splicing between lining rings. Apply adhesive to the inter-ring joint surface of the previous lining ring and in the waterproof groove of the inter-ring joint surface. After the adhesive reaches the required level, affix waterproof tape to the waterproof groove of the inter-ring joint surface and make sure that the waterproof tape completely covers the exposed opening of the waterproof groove of the circumferential joint surface. 4) Carry out longitudinal splicing between lining rings. During splicing, align and connect with the previous lining ring through the concave-convex tenon structure and squeeze the waterproof rubber strip in the waterproof groove on the joint surface between the rings to fill the joints between the lining rings. After the splicing is completed, inject waterproof glue into the joints between the rings through the joint glue injection hose and seal the joint glue injection hose.

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