JPH10292767A - Excavating method of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability by excavating the upper half section of a tunnel, excavating a plurality of strips of upward opened ditches to a lower half section and pushing and crushing a plurality of split partitions. SOLUTION: The upper half cross section 12 of the tunnel is excavated, and a plurality of strips of ditches 16 are formed to a lower half cross section 14. The ditches 16 are formed to the left half section 14a of the lower half cross section 14, a right half section 14b is utilized as a carrying-out path for muck generated at the time of the excavation of the upper half cross section 12 and a working path, and the same ditches 16 are formed to the right half section 14b after the left half section 14a is excavated. The ditches 16 are shaped in the arbitrary direction such as the axial direction, transverse direction, oblique direction, etc., of the tunnel 10 as required. Since the ditches 16 are opened upwards, a plurality of partitions 22 divided by the ditches 16 are separated mutually from other partitions, and formed in a tabular shape and formed in an upright shape. Consequently, the partitions 22 are pushed and crushed easily by a crusher such as a breaker, and collapsed pieces are brought to a comparatively small state. Accordingly, the tunnel can be excavated easily while the efficiency of excavation can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for excavating a tunnel, and more particularly to a method for excavating a mountain tunnel.

[0002]

2. Description of the Related Art A mountain tunnel is excavated by excavating the whole or a part of an upper half section of a tunnel and then excavating a lower half section thereof. A tunnel space is formed by excavating an upper half section and a lower half section that vertically divide a part of the ground surrounded by the excavation planning line on the entire cross section of the tunnel, that is, the cross section of the tunnel.

Conventionally, prior to the excavation of the lower half section of the tunnel, a plurality of holes extending in the axial direction of the tunnel are formed along the excavation planning line of the lower half section, and thereafter the rock mass divided into these holes is formed. (Japanese Patent Application Laid-Open No. 1361491/1990).

[0004]

According to the conventional tunnel excavation method, blasting is not used, and therefore,
The excavation of the lower half section can be performed without any noise or danger and without interrupting the excavation work of the upper half section preceding the excavation of the lower half section.

However, according to the conventional method, since the rock mass divided by the plurality of holes is relatively large, it takes a lot of effort and time to break the rock mass. There is a problem that the excavation efficiency of the lower half section is low.

An object of the present invention is to increase the excavation efficiency of a mountain tunnel, particularly the excavation efficiency of a lower half section.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to a method for excavating a whole or a part of an upper half section of a tunnel and then opening the upper half section of the tunnel to the lower half section prior to excavation of the lower half section. Digging a groove in the strip and dividing all or part of the lower half-section into a plurality of sections. further,
Then, crushing the lower half section section.

[0008]

According to the present invention, by forming a plurality of grooves which are open upward in the lower half section of the tunnel and dividing all or part of the lower half section into a plurality of sections by these grooves. The sections adjacent to each other can be independent of each other. Separate compartments are prone to crushing. For this reason, excavation of the lower half section can be easily performed, and as a result, efficient excavation of the lower half section of the tunnel and thus efficient tunnel excavation can be realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 to 3, a part of an upper half section 12 of a tunnel 10 made of relatively hard ground such as rock is excavated to construct a mountain tunnel.
Thereafter, all or part of the remaining lower half section 14 is excavated. The upper half section 12 may be excavated entirely, ie over the entire length of the tunnel, depending on the planned excavation length of the tunnel.

The upper half section 12 is excavated, for example, by blasting.

Prior to excavation of the lower half section 14, a plurality of grooves 16 are provided in the lower half section.

In the example shown in FIG. 1, these grooves 16 are formed only in the left half 14a of the lower half section 14, and the right half 14b of the lower half section 14 is formed by advanced excavation of the upper half section 12. It is left for the use of the unloading path, work path, etc. The right half 14b of the lower half section 14 is
After excavation of a, a similar groove is formed in this and then excavation. Of course, the grooves may be provided in both the left and right halves, and as shown in FIG. 4, the grooves are provided in the right half 14b first, and after the right half is excavated, the left half is excavated. The formation and excavation of the groove can be performed for 14a.

The groove 16 can be formed, for example, by using a trencher 20 having a chain cutter 18.

By providing a plurality of grooves 16, a part of the lower half section 14 can be divided into a plurality of sections 22. The groove is provided over the entire lower half section 14, that is, over the entire length of the tunnel 10, whereby the lower half section 1
All of 4 can be divided into a plurality of sections.

The groove 16 extends in the axial direction of the tunnel 10 (FIG. 1).
3), a transverse direction of the tunnel 10 (FIG. 4), and a direction obliquely intersecting with the axis of the tunnel 10 (FIG. 5). Further, the grooves may extend in two or more directions or may intersect each other (FIG. 5). Further, a plurality of grooves extending in two or more directions may cross each other so as to have a lattice shape, for example.

The grooves 16 in either direction are open upward. For this reason, the plurality of sections 22 divided by the plurality of grooves 16 are separated and independent from other sections, and have a plate shape and stand upright. The compartment 22 in such an embodiment can be easily crushed using a crushing device (not shown) such as a breaker, and the collapsed pieces are relatively small. This facilitates the fracturing of the lower half section and therefore its excavation, and also enhances the excavation efficiency.

The width dimension of the groove 16, the interval between the grooves 16, etc.
Determined taking into account the quality of the ground, hardness and softness. Further, the depth of the groove 16 is preferably set to extend from the surface of the lower half section 14 to the lower edge 24 (see FIGS. 1 to 3) therebelow.
According to this, the lower half section 14 can be crushed substantially along the planned line of the section of the tunnel 10.

The excavation of the lower half section 14 is performed by crushing the section and subsequently crushing the remainder of the section using, for example, a backhoe, and removing collapsed pieces caused by the crushing and the remaining crushing. Performed by

The groove 16 further includes a lower half section 14.
(See FIG. 1), and open to the side surface of the lower half section 14 (see FIG. 4).
By doing so, it is possible to make the partition between the grooves less constrained, and thus more easily collapse, as compared with the case where these grooves having no open portion are provided.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a tunnel during excavation.

FIG. 2 is a schematic cross-sectional view of the tunnel of FIG.

FIG. 3 is a schematic longitudinal sectional view of the tunnel of FIG. 1;

FIG. 4 is a schematic perspective view showing a state in which the upper half of a space of another tunnel being excavated is omitted.

FIG. 5 is a schematic plan sectional view of another tunnel during excavation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tunnel 12, 14 Upper half section and lower half section of tunnel 16 groove 22 section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeo Kitahara 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Headquarters, Kumagaya Gumi Tokyo Headquarters (72) Mitsuo Watanabe 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd. Inside the formula company (72) Inventor Yoshikatsu Takegaki 1-11-18, Sannichi, Minato-ku, Osaka-shi, Osaka Inside Okumura-gumi Civil Engineering Co., Ltd. (72) Inventor Hiroshi Oyama 6-35-5 Hirai, Hirai, Edogawa-ku, Tokyo Industrial Co., Ltd.

Claims (2)

[Claims] 1. After digging all or a part of an upper half section of a tunnel, prior to digging of a lower half section of the tunnel, dig a plurality of grooves opening upward in the lower half section;
A method for excavating a tunnel, comprising dividing all or a part of the lower half section into a plurality of sections. 2. The method of claim 1, further comprising subsequently crushing the lower half section.