JPH0694777B2 - Middle wall type pouring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention forms a middle wall in a face by injecting a congealing chemical solution, and efficiently excavates a tunnel or the like. Regarding excavation method.

[Conventional technology]

BACKGROUND ART Conventionally, when excavating an underground cavity such as a tunnel with soft ground or collapsible ground, a chemical solution injection method is used to reinforce the ground to enhance independence and prevent collapse. In the chemical injection method, as shown in FIGS. 4 and 5, injection holes 3 are formed at predetermined intervals in the ground 2 around the face 1, and cement milk, a synthetic resin curing agent, etc. are injected from the injection holes 3. The consolidating chemical is injected to strengthen the ground, and then the face 1 is dug.

[Problems to be Solved by the Invention]

In the conventional chemical liquid injection construction method, it is impossible to perform the injection work and the excavation work in parallel at the same time with the cutting face, and the excavation work must be stopped during the injection work, resulting in handheld operation and inefficiency. There was a problem.

The present invention solves such a problem in the chemical liquid injection method, and an object of the present invention is to provide a drilling method in which the injection work and the drilling work can be simultaneously performed in parallel and the efficiency is improved.

[Means for Solving the Problems]

This invention is a method of piercing an injection hole around a face, injecting a congealing chemical solution into the injection hole to strengthen the solidification of the ground, and then digging the face, dividing the face into a plurality of parts. The injection hole for drilling is drilled, and the chemical liquid for consolidation is injected to form the inner wall on the face, and while the injection work is performed on one of the compartments formed by this inner wall, the other compartment The above-mentioned problems are solved by carrying out drilling work at.

[Action]

First, an injection hole for partitioning the face is punched, and a chemical solution for consolidation is injected to form an inner wall on the face, and an injection hole is drilled around one of the compartments for consolidation. Inject chemicals to solidify and strengthen the ground.

Next, an injection hole is punched around the other section, and a congealing chemical solution is injected to consolidate the ground. When performing this pouring work, the digging work is performed in one of the sections where the pouring work has already finished.

When the excavation of one section is completed, the injection work of this section is performed again, and the excavation work is performed in the other section.

In this way, the injection work and the excavation work are simultaneously performed in parallel while alternating the sections.

〔Example〕

 Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of a tunnel face which is an embodiment of the present invention, and FIGS. 2 and 3 are a longitudinal sectional view and a plan view thereof. Here, injection holes 3 are drilled at predetermined intervals in the ground 2 around the cutting face 1, and a chemical liquid for consolidation such as cement milk and a synthetic resin curing agent is injected from the injection hole 3 to form the cutting face. A consolidation zone 4 is formed in the vicinity of 1. Further, an injection hole 5 for partitioning the face 1 into two is drilled in the central portion of the face 1, and a consolidating chemical is injected from the hole 5 so that the face 1 has an inner wall 6. Is formed, and thus face 1
Sections 1A and 1B are formed on the right and the left by the inner wall 6.

In this embodiment, after the construction work, only the one section 1A is dug while forming the inner wall 6 and advanced by a predetermined distance.
After the one section 1A and the other section 1B are separated by a predetermined distance, the injection work and the excavation work are alternately performed on the section 1A and the section 1B.
And take place in parallel while taking turns. That is, in the section 1A, the injection holes 3 and 5 are drilled, and a consolidating chemical solution is injected to strengthen the solidification of the ground on the side of the section 1A, and after forming the inner wall 6, the injection work is Moving to the section 1B, the injection hole 3 on the side of the section 1B is punched, and the consolidating chemical solution is injected. While the injection work of the section 1B is performed, the excavation work is performed in the section 1A. When the excavation work in the section 1A is completed, the injection work is started again in the section 1A, the excavation work is performed in the section 1B, and this work cycle is repeated thereafter. In this embodiment, since one of the sections 1A is advanced by a predetermined distance, when the injection work and the excavation work are performed in parallel, the mutual work is not complicated and the efficiency is good.

In addition, in this embodiment, the injection is performed along the entire circumference of the arch portion of the face 1, but it may be performed only in the upper half portion depending on the condition of the natural ground 2 and the construction method.

〔The invention's effect〕

According to the present invention, the injection work and the excavation work can be simultaneously performed in parallel, so that the efficiency is improved and the construction period is shortened.

[Brief description of drawings]

FIG. 1 is a front view of a tunnel face according to an embodiment of the present invention, FIGS. 2 and 3 are longitudinal sectional views and plan views thereof, and FIGS. 4 and 5 are tunnel face faces of a conventional construction method. FIG. 3 is a front view and a vertical sectional view of FIG. 1 ... face, 2 ... ground, 3,5 ... injection hole, 6 ... interior wall.

Claims (1)

[Claims] 1. A method of forming a plurality of injection face holes around a face face, injecting a congealing chemical solution into the injection face hole to strengthen the solidification of the ground, and then digging the face face, wherein the face face is divided into a plurality of parts. To form an inner wall on the face by injecting a consolidating chemical liquid to form an inner wall, and while the injection work is being performed on one of the compartments formed by the inner wall, the other compartment Medium wall type pouring digging method characterized by performing digging work with.