A method for constructing a maintenance hole for a tunnel boring machine in tunnel construction

Abstract

The present invention relates to the field of tunnel construction, and in particular to a method for constructing a tunnel boring machine maintenance tunnel in tunnel construction, comprising the following steps: S1: when a first tunnel boring machine excavates to a designed position close to a first pilot tunnel, the excavation is stopped and the shoe is supported; S2: an entrance of the first pilot tunnel is excavated on one side of the first tunnel, and the outlet of the first pilot tunnel is constructed to be connected with the designed side wall of the first maintenance tunnel; S3: the first maintenance tunnel is constructed through the outlet of the first pilot tunnel, which is smaller in scale and more economical than the support and supporting engineering of the first pilot tunnel constructed through auxiliary tunnels including inclined shafts, vertical shafts, parallel pilot tunnels or transverse tunnels, and solves the problems of difficulty in construction and large engineering workload of the entire process of the existing auxiliary tunnel that needs to be excavated nearby to reach the centerline position of the main tunnel.

Description

Technical Field

[0001] The invention relates to the field of tunnel construction, and in particular to a method for constructing a maintenance hole for a tunnel boring machine in tunnel construction. Background Art

[0002] Tunnel boring machines have the advantages of fast construction speed, small disturbance and good environment. They are increasingly used in tunnel construction in my country. After tunnel boring machines have excavated for a long distance, they often need to be repaired. Therefore, it is necessary to excavate maintenance holes in the tunnel to complete the inspection and repair of the cutterhead, tool, slag discharge system, propulsion system, support system, etc. The existing tunnel boring machine maintenance is mostly solved through auxiliary tunnels. However, another auxiliary tunnel leading to the centerline of the main tunnel is excavated nearby. The whole process is difficult to construct and the project volume is large. Even in the section where the tunnel crosses the mountain, there is no condition for setting up auxiliary tunnels.

[0003] In summary, there is an urgent need for a method for constructing a tunnel boring machine maintenance hole in tunnel construction that can solve the problem that the current tunnel boring machine maintenance uses auxiliary tunnels, the construction is difficult, and the workload is large during the entire construction process. Summary of the invention

[0004] The purpose of the invention is to provide a method for constructing a maintenance tunnel for a tunnel boring machine in tunnel construction, in view of the problem that the existing auxiliary tunnel construction requires the excavation of a small-section tunnel nearby to the centerline of the main tunnel, and the increase of the working surface of the main tunnel construction through inclined shafts, vertical shafts, parallel pilot tunnels or cross tunnels, and the whole process is difficult to construct and the amount of engineering work is large.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for constructing a tunnel boring machine inspection hole in tunnel construction comprises the following steps: S1: when a first tunnel boring machine excavates to a designed position close to a first pilot tunnel, the excavation is stopped and the shoe is supported; S2: an entrance of the first pilot tunnel is excavated on one side of the first tunnel, and the outlet of the first pilot tunnel is constructed to be connected with the designed side wall of the first inspection hole; S3: the first inspection hole is constructed through the outlet of the first pilot tunnel.

[0007] When the first TBM moves to the designed position close to the first pilot tunnel, it stops excavating and supports the boots, excavates the entrance of the first pilot tunnel on one side of the first TBM, and connects the exit of the first pilot tunnel with the designed side wall of the first inspection tunnel. The construction of the first inspection tunnel through the first pilot tunnel is smaller in scale and more economical than the construction through auxiliary tunnels including inclined shafts, vertical shafts, parallel pilot tunnels or cross tunnels. It solves the existing problem of opening an auxiliary tunnel to construct to the center line of the main tunnel and excavating the first inspection tunnel, and the whole process is difficult and labor-intensive.

[0008] Furthermore, when the first tunnel boring machine and the second tunnel boring machine are used to construct two tunnels, the following steps are also included: S4: excavating the entrance of the second pilot tunnel through one side of the first inspection tunnel, and constructing so that the exit of the second pilot tunnel can be connected to the side wall of the designed second inspection tunnel; S5: constructing the second inspection tunnel through the exit of the second pilot tunnel. By setting up the first inspection tunnel and the second inspection tunnel respectively to detect the tunnel boring machine separately, the scale of the subsequent tunnel boring machine maintenance project can be reduced.

[0009] Further, in step S1, when the cutter head of the first tunnel boring machine is located at a distance of 5 to 30 m from the front end of the first guide tunnel along the moving direction of the first tunnel boring machine, the first tunnel boring machine stops tunneling.

[0010] Furthermore, in step S2, during the construction of the first pilot tunnel, initial support and advance support are performed on the first pilot tunnel; in step S3, during the construction of the first inspection tunnel, initial support and advance support are performed on the first inspection tunnel. The initial support and necessary advance support are provided during the construction of the first pilot tunnel and the first inspection tunnel, which can improve the construction safety and avoid collapse.

[0011] Furthermore, in step S4, during the construction of the second pilot tunnel, the second pilot tunnel is provided with initial support and advance support; in step S5, during the construction of the second inspection tunnel, the second inspection tunnel is provided with initial support and necessary advance support. The second pilot tunnel and the second inspection tunnel are provided with initial support and necessary advance support, which can improve the construction safety and avoid collapse.

[0012] Further, in step S2, the distance between the entrance of the first guide hole and the tail of the support shoe is 5 to 15 m.

[0013] Furthermore, the angle between the entrance of the first guide tunnel and the axis of the tunnel is 40° to 70°.

[0014] Furthermore, the angle between the outlet of the first guide tunnel and the axis of the first inspection tunnel is 40° to 70°.

[0015] Furthermore, the axis of the first inspection tunnel is colinear with the axis of the first tunnel.

[0016] Furthermore, the axis of the second inspection tunnel is colinear with the axis of the second tunnel.

[0017] Compared with the prior art, the advantages of the present invention are: when the first tunnel boring machine moves to the designed position close to the auxiliary tunnel, the tunnel boring is stopped and the boots are supported, the entrance of the first pilot tunnel is excavated on one side of the first tunnel boring machine, and the outlet of the first pilot tunnel is connected with the designed side wall of the first inspection tunnel. The construction of the first inspection tunnel through the first pilot tunnel is smaller in scale and more economical than the support and supporting projects of the first pilot tunnel constructed through auxiliary tunnels (inclined shafts, vertical shafts, parallel pilot tunnels or horizontal tunnels), which solves the problems of difficult construction and large amount of engineering in the existing auxiliary tunnel that needs to be excavated nearby to reach the centerline of the main tunnel.

[0018] Other beneficial effects of this application are:

[0019] 1. When the first tunnel boring machine and the second tunnel boring machine are used to construct two tunnels, the entrance of the second pilot tunnel is excavated through one side of the first inspection tunnel, and the exit of the second pilot tunnel is constructed so that it can be connected with the designed side wall of the second inspection tunnel; the second inspection tunnel is constructed through the second pilot tunnel, and the tunnel boring machines are inspected separately by setting up the first inspection tunnel and the second inspection tunnel respectively, which can reduce the scale of the subsequent tunnel boring machine inspection project. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a flow chart of a method for constructing a maintenance hole for a tunnel boring machine in tunnel construction.

[0021] Figure 2 The present invention is a structural schematic diagram of a tunnel boring machine maintenance hole in tunnel construction.

[0022] Figure 3 yes Figure 2 Schematic diagram of the structure of the cross-section of the AA part.

[0023] Figure 4 yes Figure 2 Schematic diagram of the structure of the cross-section of the middle BB area.

[0024] Marking in the figure

[0025] 1- support boots, 2- first pilot tunnel, 3- first inspection tunnel, 4- second pilot tunnel, 5- second inspection tunnel, 6- cutterhead, 7- first tunnel, 8- second tunnel, 9- initial support. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Example 1

[0028] like Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiment shown is a method for constructing a tunnel boring machine inspection hole in tunnel construction, S1: when the first tunnel boring machine excavates to the designed position close to the first pilot tunnel 2, it stops excavating and supports the shoe 1; S2: excavating the entrance of the first pilot tunnel 2 on one side of the first tunnel, and constructing the outlet of the first pilot tunnel 2 to be connected with the designed side wall of the first inspection hole 3; S3: constructing the first inspection hole 3 through the outlet of the first pilot tunnel 2. If a pilot hole is opened at the top of the first tunnel 7, the construction efficiency is slow and the risk of collapse is high; if a pilot hole is constructed at the bottom of the first tunnel 7, drainage is difficult and the lower part of the tunnel boring machine is prone to collapse after being rescued. Therefore, When the first tunnel boring machine moves to the designed position close to the first pilot tunnel 2, it stops excavating and supports the shoe 1, and excavates the entrance of the first pilot tunnel 2 on one side of the first tunnel 7, and connects the outlet of the first pilot tunnel 2 with the designed side wall of the first inspection tunnel 3. The construction of the first inspection tunnel 3 through the first pilot tunnel 2 is smaller in scale and more economical than the construction through auxiliary tunnels including inclined shafts, vertical shafts, parallel pilot tunnels or cross tunnels. This solves the problem of difficult construction and large amount of engineering in the entire process of the existing auxiliary tunnel that needs to be excavated nearby to reach the centerline of the main tunnel.

[0029] Example 2

[0030] like Figure 1 , Figure 2 , Figure 3 and Figure 4 In the embodiment shown, in step S1, along the moving direction of the first tunnel boring machine, when the cutter head 6 of the first tunnel boring machine is located at a distance of 5 to 30 m from the front end of the first guide tunnel 2, the first tunnel boring machine stops tunneling. In step S2, during the construction of the first guide tunnel 2, initial support 9 and advance support are performed on the first guide tunnel 2; in step S3, during the construction of the first inspection tunnel 3, initial support 9 and advance support are performed on the first inspection tunnel 3. The initial support 9 and necessary advance support are provided during the construction of the first guide tunnel 2 and the first inspection tunnel 3, which can improve the construction safety and avoid collapse. In step S4, during the construction of the second guide tunnel 4, initial support 9 and advance support are performed on the second guide tunnel 4; in step S5, during the construction of the second inspection tunnel 5, initial support 9 and advance support are performed on the second inspection tunnel 5. The initial support and necessary advance support are provided during the construction of the second guide tunnel 4 and the second inspection tunnel 5, which can improve the construction safety and avoid collapse.

[0031] Furthermore, in step S2, the distance between the entrance of the first guide hole 2 and the tail of the gripper shoe 1 is 5 to 15 m.

[0032] Furthermore, the angle between the entrance of the first guide tunnel 2 and the axis of the first tunnel 7 is 40° to 70°. As the first guide tunnel 2 is constructed forward, the angle between the two becomes smaller and becomes 0°. As the first guide tunnel 2 is constructed forward, the angle between the exit of the first guide tunnel 2 and the axis of the first inspection tunnel 3 is 40° to 70°, which can reduce the engineering workload of the first guide tunnel 2.

[0033] Furthermore, the axis of the first inspection tunnel 3 is colinear with the axis of the first tunnel 7 .

[0034] Furthermore, the axis of the second inspection tunnel 5 is colinear with the axis of the second tunnel 8 .

[0035] Furthermore, the initial support 9 of the first guide tunnel 2 and the second guide tunnel 4 is shotcrete, anchor rods, steel mesh and necessary steel arch structure arranged at intervals along the direction of the guide tunnel. The necessary advance support is implemented in the arch of the guide tunnel and is driven obliquely upward. The above measures can ensure the support effect of the guide tunnel and avoid collapse of the guide tunnel after excavation.

[0036] Example 3

[0037] like Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiment shown in the figure also includes the following steps when the first tunnel boring machine and the second tunnel boring machine are used to construct two tunnels: S4: excavating the entrance of the second guide tunnel 4 through one side of the first inspection tunnel 3, and constructing the outlet of the second guide tunnel 4 to be connected to the side wall of the designed second inspection tunnel 5; S5: constructing the second inspection tunnel 5 through the outlet of the second guide tunnel 4. By respectively setting up the first inspection tunnel 3 and the second inspection tunnel 5 to detect the tunnel boring machines respectively, the scale of the subsequent tunnel boring machine maintenance project can be reduced.

[0038] 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 and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing a tunnel boring machine inspection hole in tunnel construction, characterized in that: The steps include: S1: When the first tunnel boring machine excavates in the first tunnel (7) to a designed position close to the first pilot tunnel (2), the excavation is stopped and the shoe (1) is supported; S2: excavating the entrance of the first pilot tunnel (2) on one side of the first tunnel (7), and constructing so that the outlet of the first pilot tunnel (2) is connected to the side wall of the designed first inspection tunnel (3); S3: constructing the first inspection tunnel (3) through the outlet of the first pilot tunnel (2); The axis of the first inspection tunnel (3) is collinear with the axis of the first tunnel (7); The first tunnel boring machine moves into the first inspection hole (3) for inspection; When two tunnels are constructed using a first tunnel boring machine and a second tunnel boring machine, the following steps are also included: S4: excavating the entrance of the second pilot tunnel (4) through one side of the first inspection tunnel (3), and constructing so that the outlet of the second pilot tunnel (4) can be connected to the side wall of the designed second inspection tunnel (5); S5: constructing the second inspection tunnel (5) through the outlet of the second pilot tunnel (4).

2. A method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: In step S1, along the moving direction of the first tunnel boring machine, when the cutter head (6) of the first tunnel boring machine is located at a distance of 5 to 30 m from the front end of the first guide tunnel (2), the first tunnel boring machine stops tunneling.

3. A method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: In step S2, during the construction of the first pilot tunnel (2), initial support and advance support are performed on the first pilot tunnel (2); in step S3, during the construction of the first inspection tunnel (3), initial support and advance support are performed on the first inspection tunnel (3).

4. The method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: In step S4, during the construction of the second pilot tunnel (4), initial support and advance support are performed on the second pilot tunnel (4); in step S5, during the construction of the second inspection tunnel (5), initial support and advance support are performed on the second inspection tunnel (5).

5. The method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: In step S2, the distance between the entrance of the first guide hole (2) and the tail of the gripper shoe (1) is 5 to 15 m.

6. The method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: The angle between the entrance of the first guide tunnel (2) and the axis of the first tunnel (7) is 40° to 70°.

7. The method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: The angle between the outlet of the first guide tunnel (2) and the axis of the first inspection tunnel (3) is 40° to 70°.

8. The method for constructing a tunnel boring machine inspection hole in tunnel construction according to claim 1, characterized in that: The axis of the second inspection tunnel (5) is colinear with the axis of the second tunnel (8).

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