JP3056949B2 - Structure of cut slope and its construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cut slope formed on a ground including soft rock and a method of constructing the same.

[0002]

2. Description of the Related Art Heretofore, a plurality of anchor members have been driven into a slope that has been partially cut off and exposed to the ground, a frame member has been arranged on the slope, the frame member has been fixed to the anchor member, and It has been practiced to form a cut slope by repeatedly forming a small step following the slope from the top to the bottom of the ground.

[0003]

When cutting is performed to form a long slope on a ground containing soft rocks such as sandstone and mudstone of the Tertiary period, loosening of the ground proceeds from the cut slope. Surface collapse occurs, and a slip surface is formed at a deep position separated from the long slope. In the anchor member, the progress of the loosening of the ground cannot be prevented, and the anchor member does not effectively act as a deterrent against the weathered soil mass moving along the sliding surface, or the stress of the ground due to the cutting. There is a risk that the anchor member may fall out of the ground due to opening. An object of the present invention is to avoid the occurrence of a slip surface at a deep position in the ground including soft rock, or to stabilize the slope by suppressing stress release, and to prevent the collapse of the ground by reliably reducing the structure of the cut slope. It is to provide a construction method.

[0004]

According to the present invention, the structure of the cut slope formed on the ground including the soft rock, which has the slope,
A multi-stage retaining wall installed vertically or almost vertically in the ground from the slope of the ground and fixed to the ground by a plurality of anchor members, and a retaining wall formed by cutting a part of the ground. The anchor member of the lower retaining wall is inserted into a hole formed in the lower retaining wall, the upper retaining wall and the ground, and the hole is inserted into the hole. An anchor bolt filled with grout and a nut screwed to a tip of the anchor bolt protruding from the lower retaining wall. Further, according to the present invention,
A method for constructing a cut slope on a ground including soft rock, which has a slope, comprises installing a vertical or almost vertical earth retaining wall from the slope into the earth, and using a plurality of anchor members of the earth retaining wall. A step of fixing to the ground and forming a small step by cutting a part of the ground on the valley side of the retaining wall is sequentially performed from the upper part to the lower part of the slope of the ground. The lower retaining wall is installed so as to partially oppose the upper retaining wall, and the lower retaining wall is fixed to the ground by the anchor member, and the lower retaining wall is fixed to the lower retaining wall. An anchor bolt is inserted into a hole drilled in the upper retaining wall and the ground, and the hole is filled with grout. It is performed by combining.

[0005]

According to the present invention, a vertical or substantially vertical earth retaining wall provided in multiple steps along the slope of a ground containing soft rock extends from the top to the bottom of the ground located behind it. Since the ground member is restrained one after another and the loosening of the ground due to the release of the stress caused by the cutting is suppressed, there is no possibility that the anchor member fixing the retaining wall to the ground on the rear side comes off from the ground. Further, due to the restraint of the ground by the retaining wall, stress release accompanying cutting, slaking,
Since swelling and the like are suppressed, collapse peculiar to the ground including soft rock can be reliably prevented.

According to the present invention, the steps of installing the retaining wall, fixing the retaining wall to the ground, and forming a small step are applied stepwise from the upper part of the ground to the lower part. Cut slopes can be constructed. According to the present invention, a vertical or almost vertical earth retaining wall is installed in multiple stages along the slope of the earth, and the earth behind the earth retaining wall is restrained one after another from its upper part to its lower part. Thus, a cut slope having a steep slope can be constructed, whereby the amount of sediment generated by the slope cut can be significantly reduced. Furthermore, the land newly generated by the cut can be effectively used. Further, embankment on the site and vegetation can create a landscape in harmony with the surrounding environment.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a cut slope 1 according to the present invention.
The structure of No. 0 is a multi-stage retaining wall 14 installed vertically in a soft rock ground 12 containing soft rocks, especially tertiary sandstone, mudstone and the like.
And a plurality of anchor members 16 for fixing the retaining wall 14 of each step to the ground 12, and small steps 18 formed between the retaining walls 14.

[0008] The multi-stage retaining wall 14 is composed of an underground continuous wall or a column row pile parallel to each other.
From 9 extends through the ground in a direction perpendicular to the plane of the paper of FIG. Alternatively, the retaining wall 14 may be installed so as to be slightly inclined toward the mountain side of the ground 12, that is, substantially vertically.

Each anchor member 16 extends downward through the ground 12 through the upper end of the retaining wall 14. The anchor member 16 inserts an anchor bolt into a hole formed in the retaining wall 14 and the ground 12, fills the hole with grout, and screws a nut to a tip of the anchor bolt projecting from the retaining wall 14. Install by doing.

After the anchor member 16 is installed on the uppermost retaining wall 14, the ground 12 on the valley side of the retaining wall 14.
Is excavated to form a small step 18 at a predetermined height position. The ground part cut out by excavation is indicated by imaginary lines.

Next, the next retaining wall 14 extending downward from the small step 18 formed by cutting is constructed in the ground 12 and the anchor member 16 is installed. Lower retaining wall 14
Is partially opposed to the upper retaining wall 14.
The distance between the lower retaining wall 14 and the upper retaining wall 14 formed earlier is determined by the physical and mechanical characteristics of the ground and the designed retaining wall so that the loosening of the ground due to the cut does not increase rapidly. Determined in consideration of strength, anchor strength, etc.

Thereafter, in the same manner as described above, the ground 12 is fixed by the other anchor members 16 of the lower retaining wall 14.
And forming the step 18 are performed.

The steps of installing the retaining wall 14, fixing the retaining wall 14 to the ground 12 by the anchor member 16 and forming the small steps 18 are sequentially performed from the upper part to the lower part of the ground 12, that is, stepwise. To cut slope 1
0 is constructed.

The lower retaining wall 14 fixed to the ground 12
And the anchor member 16, the upper retaining wall 1
4 loosening of the ground due to the cut on the back or back side is suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a cut slope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cut slope 12 Soft rock ground 14 Retaining wall 16 Anchor member 18 Small step 19 Slope

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Sadao Uno 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Stock Company Kumagaya Gumi Tokyo Head Office (72) Inventor Daijiro Tanabe 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Stock Company Kumagaya Gumi Tokyo headquarters (56) References JP-A-50-56704 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02D

Claims (2)

(57) [Claims] 1. A multi-stage retaining wall which is installed vertically or almost vertically from a slope of a ground containing soft rock and has a slope, and is fixed to the ground by a plurality of anchor members. The anchor member of the lower retaining wall is inserted into a hole drilled in the lower retaining wall, the upper retaining wall and the ground, and the hole is filled with grout; and A multi-stage retaining wall composed of a nut screwed to the tip of the anchor bolt protruding from the lower retaining wall, and a small step formed between the retaining walls by cutting a part of the ground. Including, the structure of the cut slope. 2. A vertical or substantially vertical earth retaining wall is provided from the slope of the ground including soft rock, which has a slope, into the ground, and a plurality of anchor members of the earth retaining wall are used to attach the earth to the ground. Fixing, and forming a small step by cutting a part of the ground on the valley side of the earth retaining wall, sequentially including from the upper part to the lower part of the slope of the ground, The retaining wall is installed so as to partially face the upper retaining wall, and the anchoring of the lower retaining wall to the ground by the anchor member is performed by the lower retaining wall and the upper retaining wall. By inserting an anchor bolt into a hole drilled in the retaining wall and the ground, filling the hole with grout, and screwing a nut to a tip of the anchor bolt protruding from the lower retaining wall. How to build a cut slope.