A construction method and cross passage structure suitable for TBM construction access

Abstract

This invention provides a construction method and cross passage structure suitable for TBM construction access, belonging to the field of civil engineering technology, including the following steps: S1. Cross passage design optimization: the net height and net width of the cross passage after lining are increased to meet the passage requirements of the highest transport equipment and the requirements for turning around; S2. Optimization of the connection method between the cross passage and the main tunnel: while ensuring the original net height of the cross passage, the bottom slab of the cross passage is excavated deeper and backfilled to be consistent with the height of the inverted arch block of the left or right line. After the backfilling is completed, the cross passage serves as a connecting transport between the left and right lines. Compared with TBM rail transport, this invention solves the material transport problems caused by the construction of certain structures in TBM rail transport while meeting the requirements of simultaneous construction of TBM tunnels, greatly improving transport efficiency, providing space for many operations, and ensuring the feasibility of construction organization, realizing a method of simultaneous construction of dual TBM rail transport tunneling, cross passage excavation, and subsequent supporting facilities.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, specifically to a construction method and cross passage structure suitable for TBM construction access. Background Technology

[0002] Currently, there are more and more long tunnels across the country. The connection between single-track twin-bore trackless transport TBM tunnels is mainly through construction cross passages, which are usually excavated by blasting. Construction between completed tunnels not only presents high technical difficulties, but also requires a large space as it is mainly used for material transportation during construction. Due to the special nature of TBM trackless transport, the design of cross passages becomes particularly important. It must not only achieve construction feasibility, but also ensure the diversity of material transportation, otherwise it will seriously affect TBM construction.

[0003] TBM trackless transport construction differs greatly from tracked transport construction. The tunnel structure and construction sequence are very different. Due to the differences in the tunnel structure in different parts, the transport between the main tunnel and the cross passage (the main tunnel is the left and right lines) and between the cross passages becomes frequent. Conventional cross passage designs cannot meet the requirements of trackless transport, which makes it impossible for the TBM to carry out subsequent structural construction such as lining normally. Summary of the Invention

[0004] This invention provides a construction method and cross passage structure suitable for TBM construction access, in order to solve the technical problems in the prior art.

[0005] To solve the above problems, the construction method for TBM construction access provided by the present invention adopts the following technical solution, including the following steps: S1. The cross passage design is optimized, and the net height and net width of the cross passage are increased after lining to meet the passage requirements of the highest transport equipment and the requirements for turning around. S2. The connection between the transverse passage and the main tunnel is optimized. While ensuring the original clearance of the transverse passage, the bottom plate of the transverse passage is excavated and deepened, and the bottom is backfilled to be consistent with the height of the inverted arch block of the left or right line. After the bottom is backfilled, the transverse passage serves as the connecting transportation between the left and right lines. S3. Material transportation construction organization: After the construction cross passages are successively completed, material transport vehicles can travel from the left line through the No. 1 cross passage to the right line and then turn back to the left line through the No. 2 cross passage. Thus, the remaining structural construction can be carried out between the No. 1 and No. 2 cross passages on the left line, avoiding the situation of equipment blocking the road during the construction process. The construction organization following the S4.TBM involves transport vehicles initially passing over the inverted arch blocks on the left or right line. After excavating at least two transverse passages, the subbase construction on the left or right line between the transverse passages is carried out, and the road can be closed for non-destructive testing. After excavating a certain number of transverse passages, a small-section trolley can be used for the transverse passage arch wall lining construction to improve the portability of material transportation.

[0006] As a further improvement, in step S1, the clear height of the transverse passage is 5m and the clear width of the transverse passage is 6m.

[0007] As a further improvement, in step S3, the remaining structural construction between the left-side cross passage No. 1 and cross passage No. 2 includes the construction of the low side wall, arch wall lining, and concrete pouring of the foundation.

[0008] The present invention also provides a cross passage structure suitable for TBM construction access, wherein the cross passage has a clear height of 5m, a clear width of 6m, and the bottom height of the cross passage is consistent with the height of the inverted arch block of the left or right line.

[0009] The beneficial effects of the above-described technical solution of the present invention are as follows: Compared with TBM rail transport, this invention proposes a construction method that uses a cross passage for high-efficiency, diverse, and dual-TBM trackless transport. While ensuring simultaneous TBM tunnel construction, it solves the material transport problems caused by certain structural construction processes in TBM rail transport, greatly improves transport efficiency, provides space for many operations, and ensures the feasibility of construction organization, realizing a method for simultaneous construction of dual-TBM rail transport tunneling, cross passage excavation, and subsequent supporting facilities. Attached Figure Description

[0010] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 This is a schematic diagram of a TBM tunnel cross-section for the construction method of the present invention applicable to TBM construction access. Figure 2 This is a cross-sectional schematic diagram of the construction method of the TBM construction passage applicable to the present invention. Figure 3 This is a schematic diagram showing the connection between the transverse passage and the main tunnel in the construction method of the TBM construction passage applicable to the present invention.

[0011] Explanation of reference numerals in the attached figures: 1. Right line; 2. Horizontal channel 1; 3. Left line; 4. Horizontal channel 2. Detailed Implementation

[0012] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0013] In existing technologies, TBM trackless transportation construction differs from tracked transportation construction. The tunnel structure and construction sequence are very different. Due to the differences in the tunnel structure of various parts, transportation between the main tunnel and the cross passage (the main tunnel is the left and right lines) and between the cross passages becomes frequent. Conventional cross passage designs cannot meet the requirements of trackless transportation, which makes it impossible for the TBM to carry out subsequent structural construction such as lining normally.

[0014] To address the aforementioned issues, this invention re-optimizes the structure of the cross passage. The optimized cross passage has a clear height of 5m and a clear width of 6m. The height of the bottom of the cross passage after excavation, paving, and backfilling is consistent with the height of the inverted arch block of either left line 3 or right line 1. The optimized cross passage can meet the passage requirements of the highest transport equipment and the requirements for turning around. Thus, after the construction of the cross passages is completed, material transport vehicles can travel from left line 3 through cross passage 2 to right line 1 and then turn back to left line 3 through cross passage 4. This allows for the construction of other structures between cross passage 2 and cross passage 4 on left line 3, avoiding equipment obstruction during construction. This significantly improves transportation efficiency, provides space for many operations, and ensures the feasibility of construction organization.

[0015] After introducing the basic principles of the present invention, various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustrative purposes only and not for limitation, and any naming is for distinction only and has no limiting meaning.

[0016] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0017] Example 1 of the construction method and cross passage structure suitable for TBM construction passages provided by the present invention: like Figures 1-3 As shown, the construction method applicable to TBM construction access includes the following steps: S1. The cross passage design is optimized, and the net height and net width of the cross passage after lining are increased. The net height of the cross passage is 5m and the net width of the cross passage is 6m, so as to meet the passage requirements of the highest transport equipment and the requirements for turning around. S2. The connection between the transverse passage and the main tunnel is optimized. While ensuring the original clearance of the transverse passage, the bottom slab of the transverse passage is excavated and deepened, and the bottom is backfilled to be consistent with the height of the inverted arch block of the left line 3 or the right line 1 (the left line 3 and the right line 1 are the main tunnels of the left and right tunnels, respectively. Here, the left line 3 and the right line 1 are only relative). After the bottom is laid, the transverse passage serves as the connecting transportation between the left and right lines 1. S3. Material transportation construction organization: After the construction cross passages are successively completed, material transport vehicles can travel from left line 3 through cross passage 1 2 to right line 1 and then turn back to left line 3 through cross passage 2 4. Thus, the remaining structural construction can be carried out between cross passage 1 2 and cross passage 2 4 on left line 3. The remaining structural construction includes the construction of low side walls, arch wall lining, and concrete pouring of the foundation layer, avoiding the situation of equipment blocking the road during construction. The construction organization following the S4.TBM involves transport vehicles initially passing over the inverted arch blocks of the left line 3 or right line 1. After excavating at least two transverse passages, the subbase construction of the left line 3 or right line 1 between the transverse passages is carried out, and the road can be closed for non-destructive testing. After excavating a certain number of transverse passages, a small-section trolley can be used for the transverse passage arch wall lining construction to improve the portability of material transportation.

[0018] In step S4, a certain number of transverse channels are required, which means that the number of transverse channels is equal to the number of channels that need to be used for cross-line transportation between left and right lines plus one more channel.

[0019] This embodiment also provides a cross passage structure suitable for TBM construction access. The cross passage has a clear height of 5m and a clear width of 6m. The bottom height of the cross passage is consistent with the height of the inverted arch block of the left line 3 or the right line 1. To facilitate transportation, the ends of the cross passage are widened with flared openings to ensure that large equipment can pass smoothly.

[0020] While various embodiments of the invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of the invention and therefore cover any modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A method of construction suitable for use in a TBM construction tunnel, characterised in that, Includes the following steps: S1. The cross passage design is optimized, and the net height and net width of the cross passage are increased after lining to meet the passage requirements of the highest transport equipment and the requirements for turning around. S2. The connection between the transverse passage and the main tunnel is optimized. While ensuring the original net height of the transverse passage, the bottom plate of the transverse passage is excavated and deepened, and the bottom is backfilled to be consistent with the height of the inverted arch block of the left line (3) or the right line (1). After the bottom is backfilled, the transverse passage serves as the connecting transportation between the left and right lines (1). S3. Material transportation construction organization: After the construction cross passages are successively completed, the material transport vehicle can travel from the left line (3) through the first cross passage (2) to the right line (1) and then through the second cross passage (4) to the left line (3). Thus, the construction of other structures can be carried out between the first cross passage (2) and the second cross passage (4) on the left line (3), avoiding the situation of equipment blocking the road during the construction process. S4.TBM post-construction organization: transport vehicles pass above the arch blocks of the left line (3) or right line (1) in the early stage. After at least two cross passages are excavated, the subbase construction of the left line (3) or right line (1) between the cross passages is carried out, and the road can be closed for non-destructive testing. After a certain number of cross passages are excavated, a small cross section trolley can be used for the construction of the cross passage arch wall lining to improve the portability of material transportation.

2. The construction method suitable for TBM construction tunnel according to claim 1, characterized in that: In step S1, the clear height of the cross passage is 5m and the clear width of the cross passage is 6m.

3. The construction method suitable for TBM construction access according to claim 1, characterized in that: In step S3, the remaining structural construction between the first horizontal passage (2) and the second horizontal passage (4) on the left line (3) includes the construction of the low side wall, the arch wall lining, and the concrete pouring of the cushion layer.

4. A cross passage structure suitable for use in a TBM construction tunnel, characterised in that: The clear height of the transverse passage is 5m, the clear width of the transverse passage is 6m, and the bottom height of the transverse passage is consistent with the height of the inverted arch block of the left line (3) or the right line (1).

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