JPH0525993A - Arch shell constructing method in work preceding tunnelling - Google Patents

Abstract

(57) [Summary] [Purpose] Providing an arch-chel construction method for tunnel pre-construction that enables continuous and independent construction of arch-shell construction independent of tunnel excavation, and enables safe and rapid excavation of tunnels with ultra-large cross-section. To do. [Structure] The top tunnel 1 and the left and right sidewall tunnels 2 and 2 are excavated in advance, each of the tunnels is used as a working tunnel, and each arch tunnel is used as a guide to advance the arch shell excavator 3 to remove waste. Sidewall tunnel 2,
In addition to being carried out from 2, the concrete was loaded from the top pit 1 and placed, and the arch shell 4 was placed in front of the tunnel excavation face.
To build.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an arch shell in a preparatory construction, which is one of auxiliary construction methods for tunnel excavation.

[0002]

2. Description of the Related Art Various methods have been proposed as the above-mentioned receiving method, but these methods are methods of constructing the receiving work of a certain length forward from the tunnel excavation face.

[0003]

Since the conventional receiving method is carried out by using the tunnel excavation face, it competes with the tunnel excavation work and the work is performed within the excavation cycle time. In addition, in the above-mentioned conventional method, there is a limit to the length of the preparatory work. The present invention has been proposed in view of the above-mentioned problems of the prior art, and the object thereof is to enable continuous work of arch arch construction that is independent of tunnel excavation and is safe even for tunnels of ultra-large cross section. Moreover, the point is to provide a method for constructing an arch shell in a tunnel pre-construction process that enables rapid digging.

[0004]

In order to achieve the above-mentioned object, according to the method of constructing an arch shell in a tunnel receiving work according to the present invention, a top digging shaft and left and right side wall diggings are excavated in advance, An arch shell excavator in which rotary excavating members mounted on a rotary shaft parallel to the tunnel axis are arranged in a row along the arch line connecting the top tunnel and the side tunnel from the excavator body. , The top tunnel and the left and right side wall tunnels are guided as guides, the shear is carried out from the side wall tunnel, and the arch concrete is loaded and placed from the top tunnel, and the arch shell is placed in front of the tunnel excavation face. Is to build.

[0005]

According to the present invention, as described above, the top pit and the left and right sidewall pits are excavated prior to tunnel excavation, and the respective pits are used as work pits and assembled in the starting base. The arch shell excavator is advanced by using each of the guide shafts as a guide, and an arch-shaped portion is formed by a rotary excavating member that is lined up along an arch line connecting the top guide shaft and the side wall guide shaft from the excavator body. Excavation, drop the shear generated at this time to each side wall guideway and carry it out of the mine, carry in concrete through the top guideway and place it, independent of tunnel excavation, tunnel ahead An arch shell is constructed in front of the excavation face.

[0006]

The present invention will be described below with reference to the illustrated embodiments. The top pit 1 and the left and right sidewall pits 2 and 2 are advanced and excavated by a known method in the center of the top of the tunnel cross section and the left and right sidewalls of the tunnel, respectively. (See FIG. 3) Next, the starting base of the arch shell excavator 3 is excavated by a known method, and the excavator 3 is assembled in the base. (Refer to FIG. 4) The arch shell excavator 3 is constructed such that the excavator main body 3 a traveling in the top guide shaft 1 is moved along the arch line connecting the top guide shaft 1 and the side wall guide shaft 2 from the main body 3 a. A rotary excavating member 3b is mounted in a row on a rotary shaft parallel to a tunnel shaft that is driven and rotated by a drive mechanism from 3a. The excavator 3 has substantially the same structure as a rotary underground continuous wall excavator applied to horizontal excavation. A skin plate 3c is provided outside the excavator 3 to stabilize the excavation wall surface. (Refer to FIG. 2) The guide shaft 1 installed in the ground by the arch shell excavator 3
The trench excavation part 8 and the arch shell part are excavated at the same time with the arch shell excavation part vertically spaced and the slide is dropped into the side wall guideway 2 to be carried out from the guideway 2 at the same time. Concrete is carried in through the pit 1 and concrete is placed in the arch shell section excavated from the guide pit 1 as described above to construct the arch shell 4. (See FIGS. 2 and 5) The arch shell excavator 3 is propelled by the propelling jack 5 while supporting the reaction force on the concrete portion of the existing arch shell 4.

Next, the tunnel main body 6 is constructed in the arch shell 4 by a known method. Since the tunnel main body 6 is an excavation work in the rigid arch shell 4, the ultra large section tunnel can be excavated safely and promptly. It is something. (See FIG. 6) Next, the arch shell excavator 3 is dismantled and removed, and the top tunnel 1 is backfilled. (Refer to FIG. 7) In the figure, 7 is backfill soil.

[0008]

According to the present invention, as described above, by constructing the arch shell as a pre-reception by the arch shell excavator using the top tunnel and the sidewall tunnel outside the tunnel cross section as working tunnels, Independent of excavation, the continuous construction work of the preceding arch shell is possible.

Further, according to the present invention, since the construction of the tunnel main body is an excavation work in a rigid arch shell, safe and rapid excavation is possible even in an ultra-large section tunnel.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an implementation state of an embodiment of a method for constructing an arch shell in a tunnel pre-reception work according to the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a cross-sectional view showing a process of excavating a top wall guide and a side wall guide.

FIG. 4 is a cross-sectional view showing an assembly process of the arch shell excavator.

FIG. 5 is a cross-sectional view showing a process of constructing an arch shell by the arch shell excavator.

FIG. 6 is a cross-sectional view showing a tunnel construction process in the arch shell.

FIG. 7 is a cross-sectional view showing a dismantling and removing process of the arch shell excavator and a backfilling process of the top tunnel.

[Explanation of symbols]

 1 Top digging 2 Sidewall digging 3 Arch shell excavator 3a Excavator body 3b Rotating excavating member 4 Arch shell 6 Tunnel body 7 Backfill soil 8 Trench excavating part

Claims (1)

Claims: 1. A top guide shaft and left and right side wall guide shafts are excavated in advance, and along an arch line connecting each top guide shaft and side guide shafts from an excavator main body, An arch shell excavator having a row of rotary excavating members mounted on a rotary shaft parallel to the tunnel axis is advanced by using the top pit and the left and right sidewall pits as guides, and a shear is applied to the sidewall pit. A method for constructing an arch shell in tunnel pre-construction, characterized in that the arch concrete is carried out further and carried in and placed from the top guide shaft to construct an arch shell in front of a tunnel excavation face.