CN111411991A - A prefabricated steel mesh lining structure and method for a horseshoe-shaped tunnel - Google Patents

Abstract

The invention discloses an assembly type reinforcement mesh lining structure and method for a horseshoe tunnel, which comprises a plurality of horseshoe tunnel lining units which are sequentially arranged adjacently, wherein the adjacent horseshoe tunnel lining units are fixedly connected; the U-shaped tunnel lining unit comprises bottom block reinforcing mesh sheets, foot block reinforcing mesh sheets, side wall block reinforcing mesh sheets and top sealing block reinforcing mesh sheets, wherein the bottom block reinforcing mesh sheets are arranged at the bottom, the two ends of the bottom block reinforcing mesh sheets are respectively provided with the foot block reinforcing mesh sheets, the tops of the foot block reinforcing mesh sheets are connected with the side wall block reinforcing mesh sheets, and the side wall block reinforcing mesh sheets are connected with the top sealing block reinforcing mesh sheets to form an annular structure; each reinforcing mesh is formed by binding annular stressed reinforcing steel bars and constructional reinforcing steel bars, and the annular stressed reinforcing steel bars of adjacent reinforcing mesh are externally and externally connected in a staggered and epitaxial manner.

Description

A prefabricated steel mesh lining structure and method for a horseshoe-shaped tunnel

technical field

The present disclosure belongs to the technical field of cast-in-place concrete lining of tunnels, and in particular relates to an assembled steel mesh lining structure and method for a horseshoe-shaped tunnel.

Background technique

Horseshoe tunnel is a common type of hydraulic tunnel. The construction speed of horseshoe tunnel lining has a great impact on the progress and safety of the project, and the lining construction speed is often restricted by the binding of steel mesh in the tunnel.

At present, the binding and welding of steel mesh sheets for tunnel linings are mostly carried out in the tunnel. Due to the influence of space and lighting, the binding and welding efficiency of steel mesh sheets is very low. In addition, the dust and smoke generated during the binding and welding of a large number of steel bars are also difficult to dissipate in the hole, which seriously endangers the health of on-site workers.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to overcome the above-mentioned deficiencies of the prior art, and to provide an assembled reinforced mesh lining structure and method for a horseshoe-shaped tunnel; the lining structure is divided into a plurality of lining units, and each lining unit is arranged in blocks, The reinforced mesh can be prefabricated and then spliced in the tunnel to form an overall lining structure, which improves the efficiency of binding and welding of the lining of the horseshoe-shaped tunnel.

The first purpose of the present disclosure is to propose a prefabricated steel mesh lining structure for horseshoe-shaped tunnels. In order to achieve the above purpose, the present disclosure adopts the following technical solutions:

An assembled reinforced mesh lining structure for a horseshoe-shaped tunnel, comprising a plurality of horseshoe-shaped tunnel lining units arranged adjacently in sequence, and the adjacent horseshoe-shaped tunnel lining units are fixedly connected; the horseshoe-shaped tunnel lining unit Reinforcing bar mesh piece, side wall piece reinforcing mesh piece and capping block reinforcing mesh piece, the bottom piece reinforcing mesh piece is placed at the bottom, and both ends are provided with foot piece reinforcing mesh piece, the top piece of the foot piece reinforcing mesh piece and the side wall piece reinforcing bar The meshes are connected, and the reinforcing meshes of the side wall blocks are connected with the reinforcing meshes of the capping block to form a ring structure; Staggered extension connection to the inside and outside of the stressed steel bar.

As a further technical solution, the circumferential stress-bearing steel bars are arc-shaped and arranged along the cross-section of the horseshoe-shaped tunnel lining unit, the structural steel bars and the circumferential stress-bearing steel bars are arranged perpendicular to each other, and the structural steel bars of the adjacent horseshoe-shaped tunnel lining units are similar to each other. connect.

As a further technical solution, the structural steel bar has a U-shaped structure, and its U-shaped opening faces the next horseshoe-shaped tunnel lining unit.

As a further technical solution, the open end of the U-shaped structure of the structural steel bar has a bent portion facing the inside, and the bent portion extends outward.

As a further technical solution, each steel mesh is provided with two rows of circumferential stress-bearing steel bars, each row is provided with a plurality of parallel circumferential stress-bearing steel bars, and the two rows of circumferential stress-bearing steel bars are respectively arranged in the U-shaped structure of the structural steel bar. On the outside, a plurality of parallel structural steel bars are arranged between the two rows of circumferentially stressed steel bars, and the circumferentially stressed steel bars and the structural steel bars are tightly connected.

As a further technical solution, each circumferential stress-bearing steel bar is fixedly connected to a plurality of parallel structural steel bars, and each structural steel bar is also fixedly connected to a plurality of parallel circumferential stress-bearing steel bars. Steel bars are connected between the ends of the stressed steel bars.

As a further technical solution, the bottom piece of steel mesh sheet is provided with extension bars relative to the outer row of hoop stress bars, and the extension bars have the same radian as the hoop stress bars and extend outward from the ends of the hoop stress bars. , and is tightly connected with the circumferential force-bearing steel bar on the opposite outer side of the reinforcing mesh of the adjacent foot block.

As a further technical solution, the reinforcing mesh of the foot block includes a vertical reinforcing mesh piece that is fastened and connected and a folded reinforcing mesh piece, and the folded reinforcing mesh piece is arranged on the vertical reinforcing mesh piece. At the bottom, the vertical reinforced mesh piece and the folded reinforced mesh piece have a certain folded angle, and the folded reinforced mesh piece is provided with extension bars relative to the inner row of hoop stress-bearing steel bars, which is connected with the adjacent bottom piece of steel mesh. The hoop stress reinforcement on the opposite inner side of the sheet is fastened and connected.

As a further technical solution, the vertical reinforcement mesh pieces are provided with extension bars relative to the inner row of hoop stressed reinforcement bars, and are tightly connected with the inner circumferential stress reinforcement bars of the adjacent side wall block reinforcement mesh sheets.

As a further technical solution, the side wall reinforced mesh sheets are provided with extension bars relative to the outer row of circumferential stress-bearing steel bars, and the circumferential stress-bearing steel bars and capping block reinforced meshes on the outer side relative to the adjacent foot block reinforced mesh sheets are provided. The hoop stress reinforcement on the opposite outer side of the sheet is fastened and connected.

As a further technical solution, the reinforcement mesh of the capping block is provided with an extensional reinforcement bar on the inner row of the hoop stressed reinforcement, and is tightly connected with the hoop stressed reinforcement in the inner side of the reinforcement mesh of the adjacent side wall block.

As a further technical solution, the bottom block reinforcing mesh sheet and the side wall block reinforcing mesh sheet are composed of a single piece.

As a further technical solution, the bottom block reinforcing mesh sheet and the side wall block reinforcing mesh sheet are connected by a plurality of sub-blocks.

The second purpose of the present disclosure proposes the construction method of the lining structure as described above, which includes the following steps:

Reinforcement mesh for bottom block, reinforcement mesh for foot block, reinforcement mesh for side wall block and reinforcement mesh for capping block are respectively bound in the reinforcement processing factory outside the tunnel;

Transport each reinforcement mesh to the lining position of the horseshoe-shaped tunnel, assemble the reinforcement mesh for the foot block, the reinforcement mesh for the bottom block, the reinforcement mesh for the side wall block and the reinforcement mesh for the capping block in sequence, and fix it on the rock wall;

After the assembly and fixing of each steel mesh sheet is completed, the formwork is erected, blocked, and concrete is poured;

Repeat the above steps until the entire horseshoe tunnel lining is completed.

The beneficial effects of the present disclosure are:

In the lining structure of the present disclosure, the overall lining structure is divided into a plurality of lining units, and each lining unit is arranged in blocks. The lining unit is formed by connecting a plurality of steel mesh sheets, and each steel mesh sheet is prefabricated in the factory and then transported to the site for splicing. The installation has improved efficiency and shortened the construction period.

The method of the present disclosure only needs to prefabricate the steel mesh in the factory, and then assemble each steel mesh in the tunnel, which not only improves the working environment of the lining of the horseshoe-shaped tunnel lining the reinforcement hole, effectively reduces the construction interference, but also improves the horseshoe shape. Tunnel lining steel mesh binding and welding efficiency.

Description of drawings

The accompanying drawings that form a part of the present application are used to provide further understanding of the present application, and the schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute improper limitations on the present application.

1 is a schematic diagram of the overall structure of the lining structure disclosed in one embodiment;

Fig. 2 is A-A sectional view in Fig. 1;

Figure 3 is a schematic diagram of the assembly of the bottom block reinforcing mesh sheet and the foot block reinforcing mesh sheet;

Figure 4 is a schematic diagram of the assembly of the reinforcing mesh for the foot block and the reinforcing mesh for the side wall;

Fig. 5 is a schematic diagram of assembling a side wall block reinforcing mesh sheet and a capping block reinforcing mesh sheet;

In the figure, 1 bottom piece of steel mesh, 2 of foot piece of steel mesh, 3 of side wall piece of steel mesh, 4 of capping piece of steel mesh, 5 of circumferential stress steel, 6 of structural steel, 7 of bending part.

Detailed ways

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that the presence of features, steps, operations, devices, components and/or combinations thereof;

For the convenience of description, if the words "up", "down", "left" and "right" appear in the present disclosure, it only means that the directions of up, down, left and right are consistent with the drawings themselves, and do not limit the structure. It is for the convenience of describing the present disclosure and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the disclosure.

As described in the background art, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a prefabricated steel mesh lining structure and method for a horseshoe-shaped tunnel.

The present application provides an assembled reinforced mesh lining structure for a horseshoe-shaped tunnel, which includes a plurality of horseshoe-shaped tunnel lining units arranged adjacently in sequence, and the adjacent horseshoe-shaped tunnel lining units are fixedly connected; the horseshoe-shaped tunnel lining units include bottom steel bars The mesh, the reinforcing mesh for the foot block, the reinforcing mesh for the side wall and the reinforcing mesh for the capping block, the reinforcing mesh for the bottom block is placed at the bottom, and the two ends are provided with the reinforcing mesh for the foot block. The side wall blocks are connected with the reinforcement meshes, and the side wall reinforcement meshes are connected with the capping block reinforcement meshes to form a ring structure; The inner and outer staggered extension connection of the hoop stressed steel bars of the mesh.

Example 1

The lining structure disclosed in this embodiment will be further described below in conjunction with accompanying drawings 1 to 5;

The assembled reinforced mesh lining structure for horseshoe-shaped tunnels is composed of a plurality of horseshoe-shaped tunnel lining units arranged adjacently in sequence, and the adjacent horseshoe-shaped tunnel lining units are fixedly connected.

Referring to Figure 1, the horseshoe-shaped tunnel lining unit includes a bottom block reinforced mesh sheet 1, a foot block reinforced mesh sheet 2, a side wall block reinforced mesh sheet 3 and a cap block reinforced mesh sheet 4, and the bottom block reinforced mesh sheet 1 is located at the bottom, Both ends of the bottom block reinforced mesh 1 are spliced to set the foot block reinforced mesh 2, the top of the foot block reinforced mesh 2 is spliced with the side wall reinforced mesh 3, and the side wall reinforced mesh 3 is spliced to set the capping block reinforced mesh Sheet 4, bottom block reinforcing mesh sheet 1, foot block reinforcing mesh sheet 2, side wall block reinforcing mesh sheet 3 and capping block reinforcing mesh sheet 4 are sequentially spliced to form a ring-shaped integral lining unit.

Each reinforced mesh is composed of circumferential stress-bearing steel bars 5 and structural steel bars 6 bound together. The circumferential stress-bearing steel bars 5 are arc-shaped and arranged along the cross section of the horseshoe-shaped tunnel lining unit; The U-shaped structure is arranged longitudinally along the horseshoe-shaped tunnel lining unit, and its U-shaped structure opening faces the next horseshoe-shaped tunnel lining unit, and the structural steel bars 6 of the adjacent horseshoe-shaped tunnel lining units are connected.

The open end of the U-shaped structure of the structural steel bar 6 has a bent portion 7 facing the inner side of the U-shaped structure. The bent portion 7 is connected with the extended steel bar, and the extended steel bar is connected with the structural steel bar 6 of the next horseshoe-shaped tunnel lining unit.

Each reinforced mesh is provided with two rows of circumferential stress-bearing steel bars, each row is provided with a plurality of circumferential stress-bearing steel bars 5 arranged in parallel, and the two rows of circumferential stress-bearing steel bars 5 are respectively arranged on the two parallel steel bars of the structural steel 6U-shaped structure. On the outside, a plurality of parallel structural steel bars 6 are arranged between the two rows of circumferentially stressed steel bars. The circumferentially stressed steel bars and the structural steel bars are tightly connected, and the circumferentially stressed steel bars and the structural steel bars are arranged perpendicular to each other. The stressed steel bars 5 are all fixedly connected with a plurality of parallel structural steel bars 6, and each structural steel bar 6 is also fixedly connected with a plurality of parallel circumferential stress steel bars 5, and the circumferential stress on the outside of the two parallel steel bars of the structural steel bars 6 Steel bars are connected between the ends of the bars.

The circumferentially stressed reinforcing bars of the adjacent reinforcing mesh sheets are arranged in a staggered manner inside and outside, and the extended circumferentially stressed reinforcing bars are tightly connected with the circumferentially stressed reinforcing bars of the adjacent reinforcing steel mesh sheets.

Hereinafter, the definitions of "relatively inner side" and "relatively outer side" are as follows: the side adjacent to the horseshoe-shaped tunnel is the relative outer side, and vice versa.

As shown in FIG. 3 , the outer row of hoop stress-bearing rebars 5 of the bottom piece of steel mesh 1 is provided with extension bars. It extends outward and is firmly connected to the circumferential force-bearing steel bar 5 on the opposite outer side of the reinforcing mesh sheet 2 of the adjacent foot block.

The bottom reinforcement mesh sheet 1 can be set according to the height of the horseshoe-shaped tunnel: when the height of the horseshoe-shaped tunnel is ≥5m, the bottom reinforcement mesh sheet 1 can be split and divided into multiple blocks to be connected. When the height of the horseshoe-shaped tunnel is less than 5m, the bottom reinforcement mesh 1 may not be split.

The foot block reinforcement mesh piece 2 includes a vertical reinforcement mesh piece that is fastened and connected and a folded reinforcement mesh piece. The folded reinforcement mesh piece is arranged at the bottom of the vertical reinforcement mesh piece, and the vertical reinforcement mesh piece. The sheet piece and the folded reinforced mesh piece have a certain folding angle, and the folded reinforced mesh piece is used to connect with the bottom block reinforced mesh piece 1; The two setting methods are the same as those described above. The folded steel mesh pieces are arranged at the bottom to connect with the bottom piece of steel mesh 1, and the folded steel mesh pieces are set relative to the inner row of the hoop stressed steel bars 5. There are extension bars, the extension bars have the same radian as the hoop stress bars 5, and extend outward from the ends of the hoop stress bars 5, and are fastened with the hoop stress bars 5 on the opposite inner side of the adjacent bottom bar mesh 1. connect;

The vertically arranged steel mesh pieces are provided with extension bars relative to the inner row of the hoop stress bars 5, and the extension bars have the same radian as the hoop stress bars 5, and extend outward from the ends of the hoop stress bars 5, and It is tightly connected with the circumferential stress-bearing steel bar 5 on the opposite inner side of the reinforcing mesh piece 3 of the adjacent side wall block, and the vertically arranged reinforcing steel mesh piece and the extension reinforcing bar at the junction of the folded reinforcing mesh piece are staggered.

As shown in Figure 4, the side wall block reinforcement mesh 3 is provided with extension bars relative to the outer row of the hoop stress reinforcement bars 5, and the extension bars and the hoop stress reinforcement bars 5 have the same radian. It extends outward and is tightly connected with the circumferential stress-bearing steel bar 5 on the opposite outer side of the adjacent foot block reinforced mesh sheet 2 and the circumferential stress-bearing steel bar 5 on the opposite outer side of the capping block reinforced mesh sheet 4 .

The side wall reinforced mesh 3 can be set according to the height of the horseshoe-shaped tunnel: when the height of the horseshoe-shaped tunnel is ≥5m, the side wall reinforced mesh 3 can be split and divided into multiple blocks to be connected. When the height of the horseshoe-shaped tunnel is less than 5m, the reinforced mesh 3 of the side wall block may not be split.

As shown in Figure 5, the reinforcing bar mesh 4 of the capping block is provided with extension bars relative to the inner row of the hoop stress reinforcement bars 5, and the extension bars and the hoop stress reinforcement bars 5 have the same radian. It extends outward and is tightly connected with the circumferential stress-bearing steel bar 5 on the opposite inner side of the reinforcing mesh sheet 3 of the adjacent side wall block.

The present disclosure also provides the construction method of the above-mentioned lining structure, which is carried out according to the following steps:

Step 1: The reinforced mesh is designed in blocks for the convenience of transportation and quick installation, and to ensure the optimization of the overall stress structure. According to the design and excavation size of the horseshoe-shaped tunnel, as well as the calculated force, the lining of the horseshoe-shaped tunnel is designed to be a horseshoe-shaped tunnel lining unit 2 to 4 meters along the axial direction of the tunnel. The direction is divided into the bottom piece of steel mesh 1, the foot piece of steel mesh 2, the side wall piece of steel mesh 3 and the top block of steel mesh piece 4. The parts of each piece of steel mesh should avoid the parts that are subjected to greater stress.

Step 2: According to the block requirements for the lining of the horseshoe-shaped tunnel, the reinforcement mesh is bound according to the divided bottom block, foot block, side wall block and cap block in the steel bar processing plant outside the tunnel. The binding process should be within the deformation tolerance range during transportation and installation.

Step 3: The steel mesh sheets described in Step 2 are all bound by hoop stressed steel bars and structural steel bars. Among them, there is a gap of less than 200mm between the reinforced mesh and the connecting surface of the reinforced mesh to facilitate installation. Lap and anchor requirements for inside and outside. The reinforcement mesh of the capping block is extended by an anchoring length in the circumferential direction and placed on the opposite inner side to ensure the smooth installation of the reinforcement mesh of the capping block. Among them, the structural steel bars play the role of connecting the reinforcing bars in the ring direction and connecting the reinforcing bars between the rings and the rings. The structural steel bar is a "U" structure, which is bent inward at the end and extended by an anchoring length to facilitate installation; the opening is directed towards the next horseshoe-shaped tunnel lining unit connected to it, which is used for the next connected tunnel lining unit. .

Step 4: The assembly and fixing sequence of the steel mesh in the horseshoe-shaped tunnel is as follows: the bottom block, the foot block, the side wall, and finally the capping block. Each horseshoe-shaped tunnel is lined with steel mesh and transported to the lining position of the horseshoe-shaped tunnel. Then, through the assembling equipment, assemble the reinforcing mesh for the foot block, the reinforcing mesh for the bottom block, the reinforcing mesh for the side wall and the reinforcing mesh for the capping block, and fix it on the rock wall.

Step 5: After each piece of the horseshoe-shaped steel mesh is assembled and fixed, erect the formwork, block it (the first double-sided blocking, and then unilateral blocking), and pour concrete.

Step 6: Repeat steps 2 to 5 until the entire lining of the horseshoe-shaped tunnel is completed.

When the height of the horseshoe-shaped tunnel is more than 5m, the bottom block reinforced mesh 1 and the side wall reinforced mesh 3 can be divided into blocks. When splitting, the split position should be avoided to be in a place with a large force, and at the same time meet the requirements of Requirements in step 3 above. When the height of the horseshoe tunnel is less than 5m, the steel mesh can be divided into blocks according to the requirements in step 1.

Considering the transportation requirements, the length of each reinforced mesh sheet along the axis of the hole is 2-4m.

Although the specific embodiments of the present disclosure have been described above in conjunction with the accompanying drawings, they do not limit the protection scope of the present disclosure. Those skilled in the art should understand that on the basis of the technical solutions of the present disclosure, those skilled in the art do not need to pay creative efforts. Various modifications or variations that can be made are still within the protection scope of the present disclosure.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. An assembled reinforcing steel mesh sheet lining structure for a horseshoe-shaped tunnel is characterized by comprising a plurality of horseshoe-shaped tunnel lining units which are sequentially arranged adjacently, wherein the adjacent horseshoe-shaped tunnel lining units are fixedly connected; the U-shaped tunnel lining unit comprises bottom block reinforcing mesh sheets, foot block reinforcing mesh sheets, side wall block reinforcing mesh sheets and top sealing block reinforcing mesh sheets, wherein the bottom block reinforcing mesh sheets are arranged at the bottom, the two ends of the bottom block reinforcing mesh sheets are respectively provided with the foot block reinforcing mesh sheets, the tops of the foot block reinforcing mesh sheets are connected with the side wall block reinforcing mesh sheets, and the side wall block reinforcing mesh sheets are connected with the top sealing block reinforcing mesh sheets to form an annular structure; each reinforcing mesh is formed by binding annular stressed reinforcing steel bars and constructional reinforcing steel bars, and the annular stressed reinforcing steel bars of adjacent reinforcing mesh are externally and externally connected in a staggered and epitaxial manner.

2. The lining structure of claim 1 wherein said hoop load carrying bars are arcuate and are disposed along the cross-section of the horseshoe tunnel lining elements, said structural bars being disposed perpendicular to the hoop load carrying bars, the structural bars of adjacent horseshoe tunnel lining elements being connected.

3. The lining structure of claim 1 wherein said structural rebar is of a U-shaped configuration with its U-shaped opening facing toward the next horseshoe tunnel lining unit; the open end of the U-shaped structure of the construction steel bar is provided with a bending part facing to the inner side and extends outwards from the bending part.

4. The lining structure of claim 3 wherein each mesh of reinforcing bars is provided with two rows of circumferential reinforcing bars, each row is provided with a plurality of parallel circumferential reinforcing bars, the two rows of circumferential reinforcing bars are respectively arranged outside the U-shaped structure of the structural reinforcing bars, a plurality of parallel structural reinforcing bars are arranged between the two rows of circumferential reinforcing bars, and the circumferential reinforcing bars are fastened to the structural reinforcing bars.

5. A lining structure according to claim 4 wherein each hoop load carrying reinforcing bar is fixedly connected to a plurality of parallel arranged structural reinforcing bars, each structural reinforcing bar being fixedly connected to a plurality of parallel arranged hoop load carrying reinforcing bars, the reinforcing bars being connected between the ends of the hoop load carrying reinforcing bars outside the structural reinforcing bars.

6. A lining structure as claimed in claim 4 wherein said bottom panel reinforcing mesh is provided with outwardly extending reinforcing bars extending from the ends of the circumferentially oriented reinforcing bars in a row opposite the outer side of the bottom panel reinforcing mesh, the outwardly extending reinforcing bars having the same arc as the circumferentially oriented reinforcing bars and being in fixed engagement with the circumferentially oriented reinforcing bars on the opposite outer side of the adjacent bottom panel reinforcing mesh.

7. The lining structure of claim 4 wherein the foot bar mesh segments comprise a plurality of vertical bar mesh segments and a plurality of folded bar mesh segments, the folded bar mesh segments are disposed at the bottom of the vertical bar mesh segments, the vertical bar mesh segments and the folded bar mesh segments have a certain folding angle, and the rows of annular stress bars on the inner sides of the folded bar mesh segments are provided with extension bars which are fastened to the annular stress bars on the inner sides of the adjacent bottom bar mesh segments; the circumferential stressed steel bars in a row at the inner side opposite to the vertical steel bar mesh piece are provided with extension steel bars and are fixedly connected with the circumferential stressed steel bars at the inner side opposite to the adjacent side wall block steel bar mesh piece.

8. The lining structure of claim 4 wherein said side wall panel reinforcing mesh has an outer row of circumferentially oriented reinforcing bars disposed opposite said outer row of circumferentially oriented reinforcing bars, and said side wall panel reinforcing mesh is fastened to said adjacent leg panel reinforcing mesh by said outwardly oriented reinforcing bars and said top block reinforcing mesh by said outwardly oriented reinforcing bars; the circumferential stressed steel bars in the row on the inner side of the top sealing block steel bar net piece are provided with extension steel bars and are fixedly connected with the circumferential stressed steel bars on the inner side of the adjacent side wall block steel bar net piece.

9. The lining structure of claim 1 wherein said bottom panel rebar grid and said side wall panel rebar grid are formed from a single piece; or the bottom block reinforcing steel mesh and the side wall block reinforcing steel mesh are formed by connecting a plurality of blocks.

10. A method of constructing a lining structure according to any one of claims 1 to 9 including the steps of:

respectively binding bottom block reinforcing mesh sheets, foot block reinforcing mesh sheets, side wall block reinforcing mesh sheets and top sealing block reinforcing mesh sheets in a tunnel external reinforcing processing plant;

transporting each reinforcing mesh to a lining position of the horseshoe-shaped tunnel, sequentially assembling the reinforcing meshes according to the sequence of the foot block reinforcing mesh, the bottom block reinforcing mesh, the side wall block reinforcing mesh and the top sealing block reinforcing mesh, and fixing the reinforcing meshes on the rock wall;

after the reinforcing mesh pieces are assembled and fixed, erecting a template, plugging and pouring concrete;

and repeating the steps until the lining of the whole horseshoe-shaped tunnel is completely finished.

Images