JPH02304119A - Stabilizing construction method for slope - Google Patents

Abstract

PURPOSE:To stabilize a slope by inserting hollow tubes in plural round holes bored in the natural ground of a slope, and performing grouting in the round holes and the interiors of the tubes to form a retraining wall integral with each tube on the surface of the slop. CONSTITUTION:Round holes 2 are bored at designated spaces on the cut slope 1. A porous tube 3 having a lot of openings in inserted in each round hole 2. The porous tube 3 is filled up with consolidation material 4 such as cement milk or the like from the base end thereof to fix the porous tube 3 to the round hole 2. A resistance plate 5 is fixed to be integral with the base end of each porous tube 3 projected from each round hole 2. Lastly, a retaining wall is formed on the surface of the cut slope 1 where the porous tubes 3 are projected by shotcrete of a designated thickness. Thus, a stable retaining wall can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a slope stabilization method for stabilizing various slopes.

<Prior Art> In general, the gentler the gradient of a slope is designed, the more stable the slope will be, and the effects of various slope stabilization methods will also be fully demonstrated.

Incidentally, recently, due to land use constraints, there are increasing cases where slope slopes that cannot ensure slope stability are required.

A steel reinforced earth construction method has been proposed as a construction method for stabilizing steep cut slopes.

As shown in Figure 6, this construction method requires a 2 to 3 m long cut on the cut slope a.
After drilling a circular hole with a certain depth, reinforcing reinforcing bars C are inserted into the circular hole, fixed with grout d, and reinforced by spraying concrete (or mortar) e on the surface of the cut slope a. By integrating with reinforcing bars C, the cut slope a is stabilized.

<Problems to be solved by the present invention> The steel reinforced earth construction method has the advantage of short construction period and low construction cost compared to the concrete retaining wall construction method, etc.
There are the following inconveniences.

<A> Only a very small amount of tensile force is mobilized in the reinforcing reinforcing bars C.

<Expo> The reinforcing reinforcing bars C are not necessarily integrated with the ground of the circular hole.

Therefore, it is difficult to obtain sufficient adhesion strength between the reinforcing reinforcing bars C and the grout d, or between the grout d and the ground.

〈C〉 Due to the above 〈A〉〈口〉, the slope is not sufficiently stabilized.

<Object of the present invention> The present invention was made in order to solve the above-mentioned problems, and its purpose is to provide a structure that is simple and quick to perform, and has a high collapse prevention effect. The purpose of the present invention is to provide a slope stabilization method that can stabilize the entire slope by forming a retaining wall.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Cutting The mountainside indicated by the chain line in Figure 2 is cut at a predetermined slope.

Circular holes 2 are drilled in a cut slope 1 at predetermined intervals.

<Mouth> Insertion of tube bodies Next, as shown in FIG. 3, a perforated tube body 3 is inserted into each circular hole 2.

The perforated pipe body 3 is a pipe body such as a hollow steel pipe or a PVC pipe, and has a large number of holes 31 on its circumferential surface, and functions as a grout injection pipe and reinforcement against shear strength, as will be described later. It also functions as a material.

Therefore, the wall thickness and diameter of the perforated pipe body 3 are selected to provide sufficient strength to resist shear strength, and the overall length of the perforated pipe body 3 is longer than that of the circular hole 2.

Note that a non-porous tube may be used instead of the perforated tube 3.

<C> Grout injection As shown in FIG. 4, a solidifying material 4 such as cement milk is filled from the base end of each perforated tube 3, and the perforated tube 3 is fixed in the circular hole 2.

When injecting the consolidating material 4, the consolidating material 4 injected into the perforated tube body 3 is discharged from a large number of groups of openings 31 so as to permeate every corner of the circular hole 2. and a solidifying material 4 in the perforated pipe body 3.
is injected.

Therefore, the perforated pipe body 3 and the ground can be effectively integrated.

Incidentally, a known packer 7 may be attached to the mouth of the perforated tube body 3 in order to prevent the consolidation material 4 from leaking, if necessary.

<2> Attaching the resistance plate Next, as shown in FIG. 5, the resistance plate 5 is integrally fixed to the base end of each perforated tube body 3 protruding from each circular hole 2.

The resistance plate 5 can be connected by known means such as welding, screwing, pinning, or the like.

<E> As shown in FIG. 1, concrete is then sprayed to a predetermined thickness on the surface of the cut slope 1 from which the perforated pipe body 3 projects to form a retaining wall of concrete 6.

The resistance plate 5 and the perforated pipe body 3 are sprayed and buried in concrete 6.

As a result, the concrete 6 and the perforated pipe body 3 can be integrated during spraying, and the surface area of the perforated pipe body 3 can be secured to be larger than that of conventional reinforcing bars, so that the adhesion force with the ground is increased.

Therefore, a stronger retaining wall can be obtained.

<Effects of the Present Invention> Since the present invention is as described below, the following effects can be obtained.

<A> The perforated tube can be used not only as a reinforcing material but also as a tube for grout injection.

In particular, when grout is injected using a perforated pipe, the grout can be sufficiently filled into every corner of the ground, so the contact area between the ground and the grout can be increased compared to when conventional reinforcing bars are used.

Moreover, the strength of the perforated pipe body can sufficiently counter the tensile steel stress on the slope.

Therefore, even if the slope is unstable, such as a slope with a steep slope or a slope with loose soil, which is difficult to stabilize using conventional construction methods, the slope can be stabilized.

<Port> By arranging the perforated tube on the slope, the slope can be stabilized easily and quickly.

<C> Applicable not only to cutting slopes but also to stabilizing various slopes.

[Brief explanation of drawings]

Fig. 1: An embodiment of the present invention, which is a cross-sectional view of the slope when completed Fig. 2: An explanatory drawing of the construction method and an explanatory drawing when a circular hole is drilled Fig. 3: Inside the circular hole Figure 4: An enlarged view of the perforated tube inserted into the hole. Technology illustration

Claims (1)

[Claims] (1) Drill multiple circular holes in the ground of the slope, insert a hollow tube into each circular hole, and use the inner space of each tube to grout inside the circular holes and inside the tube. , A slope stabilization method that forms a retaining wall that is integrated with each pipe on the surface of the slope.