JPH04185819A - Reinforcing work of slope - Google Patents

Abstract

PURPOSE:To reinforce sloped ground only by inserting reinforcing rods into the ground by a method in which the tip of a reinforcing rod is spirally twisted in a coil form, and the reinforcing rod is penetrated into the ground while turning the spiral tip in the spiral direction to fix the spiral tip to the ground. CONSTITUTION:The pitch and twist number of the spiral tip 3 of a reinforcing rod 3, having much greater diameter D of the spiral 3 than the diameter(d) of straight part, are set up to be adequate penetration force to the ground E and also great drawing resistance. A surface-finishing material 1 is drilled to be slightly larger diameter than the diameter of the rod 2, and the rod 2 is penetrated while being turned along the direction of the spiral 3 into the ground E. After the completion of the penetration, the spiral 3 is fixed to the inside of the ground E by great resistance against drawing forces by means of the anchoring effect of the spiral 3. The projected end from the finishing material 1 of the rod 2 is fixed to the material 1 through washer 5 and nuts 6. The needs for injection of fixing material and drill can be eliminated, and slope-reinforcing work can be effectively attained with high constructing efficiency and high economical advantage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a slope reinforcement method for preventing slope collapse by driving a large number of reinforcing rods into the ground.

(Prior Art) One of the construction methods for stabilizing natural slopes and slopes constructed with cut earth or embankment is the driving method of reinforcing rods.

This construction method is called, for example, the earth nailing construction method, and is based on a principle similar to that of driving nails into a board. Especially when applied to slopes, reinforcing rods are driven into the ground. This will prevent the slope from collapsing due to ground slippage.

(5 problems to be solved by the invention) However, in this construction method, simply driving the reinforcing rod would result in damage to the product, so the tip of the reinforcing rod must be firmly fixed in the ground. It was necessary to inject a fixing material called grout, cement milk, etc. into the ground, and to insert a reinforcing rod into the center of the injected fixing material.

Therefore, the steps for this method are to drill holes in the ground,
Next, a liquid fixing material is injected into the drilled hole, a reinforcing rod is inserted before the fixing material is solidified, and the reinforcing rod must be fixed in the ground by solidifying the fixing material.
There were many types of work, and there were problems with construction efficiency and economic efficiency.

In addition, depending on the type of work, there is a method called the jet bolt method, which increases construction efficiency by ejecting a fixing material from the tip of a drilling drill at the same time as drilling, but in both cases, a fixing material is used, so wet work is not required. As a result, work procedures continued to become more complicated.

This invention was made in view of the above problems,
To provide a slope reinforcement method that can be anchored inside the ground simply by inserting a reinforcing rod into the ground.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a slope reinforcement method in which a large number of reinforcing rods are driven into the ground from the slope to reinforce the ground. At least the tip part is twisted into a coil shape to form a spiral part, and the reinforcing rod is penetrated into the ground while being rotated in the spiral direction of the spiral part, and is fixed in the ground with the spiral part as an anchoring end. be.

(Function) In the above configuration, the spiral portion penetrates while being screwed into the ground, and in the penetrating state, the anchoring effect of the ground on the spiral portion provides a large resistance to the pulling force.

(Example) Hereinafter, an example of this invention construction method will be described in detail using drawings.

FIG. 1 shows a first embodiment of the invention.

In the figure, a slope A with a predetermined slope is formed on the slope of the ground E, and its surface is covered with a surface finishing material 1 made of a precast concrete slab or the like.

A large number of reinforcing rods 2 are penetrated into this slope A so as to be substantially orthogonal thereto, and reach the inside of the ground E.

As shown in FIG. 2, this reinforcing rod 2 is made by twisting a steel wire of a predetermined thickness into a coil for a predetermined length from the tip thereof, and the diameter d of the straight portion of the reinforcing rod 2 is considerably larger than that of the reinforcing rod 2. A spiral portion 3 having a diameter is formed.

The pitch and number of twists of the helical portion 3 are set to values that provide an appropriate penetration force and large pull-out resistance, taking into account the penetration depth into the ground E and the ease of penetration due to the soil quality.

The work procedure in this construction method is to begin with the surface finishing material 1.
A hole is drilled to have a diameter slightly larger than that of the reinforcing rod 2, and then the reinforcing rod 2 penetrates the ground E while rotating along its spiral direction, and reaches the inside of the ground E.

This penetration method can be achieved by connecting a rotating machine to the head of the reinforcing rod 2 via a connecting fitting or the like and applying mechanical rotational force, but when doing it manually, the As shown in Figure 2, a T-shaped rotating jig 4
It is also possible to attach the rotation jig 4 to the head of the reinforcing rod 2 and rotate the rotation jig 4 in a spiral direction.

In either method, the spiral portion 3 of the reinforcing rod 2
Drills a spiral hole according to its thickness and pitch,
It penetrates into the ground E without causing any ground collapse at the penetrated portion.

When the penetration is completed, the spiral portion 3 bites into the ground E by its diameter and length L, and its anchoring effect provides a large resistance to the pulling force. Therefore, unless a rotational force on the pulling side is applied, the spiral portion 3 at the tip becomes a fixing portion and is fixed inside the ground E.

Furthermore, by screwing the nut 6 through the washer 5 onto the protruding end of the surface finishing material 1 of the reinforcing rod 2, the head side is also fixed to the surface of the surface finishing material 1.

In addition, the surface finishing material 1 is not limited to a precast concrete slab, and the penetration work of each reinforcing rod 2 is performed with the slope A exposed, and after the work is completed, it is formed by spraying concrete on the surface of the slope A. You can also do that.

FIG. 3 shows a second embodiment of the invention.

In the figure, the helical portion 11 of the reinforcing rod 10 is the same as that of the reinforcing rod 10 except for the head portion protruding from the surface of the surface finishing material 1.
It is formed over the entire length of.

Therefore, in this embodiment, a fixing effect can be obtained not only along the diameter D of the spiral portion 11 but also along its entire length.

It goes without saying that this reinforcing rod 10 and the reinforcing rod 2 of the first embodiment may be combined.

(Effects of the Invention) As described above in detail through the embodiments, in the slope reinforcement method according to the present invention, the spiral portion penetrates while being screwed into the ground, and in the penetrating state, the inner circumference of the spiral portion The ground has not collapsed, and the anchoring effect caused by its bite provides great resistance to pulling forces.

In addition, since the spiral part serves as the anchoring part to anchor the reinforcing rod in the ground, it eliminates the need for injection of anchoring material and equipment such as hole drilling compared to conventional methods, resulting in extremely high construction efficiency and economic efficiency. It's advantageous.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing the first embodiment of this invention, and the second
The figure is a perspective view of the reinforcing rod, and FIG. 3 is a cross-sectional explanatory view showing a second embodiment of the invention. 2.10...Reinforcement rod 3.11...Spiral part E...Ground A...Slope surface

Claims (1)

[Claims] (1) In a slope reinforcement method in which a large number of reinforcing rods are driven into the ground from the slope to reinforce the ground, at least the tips of the reinforcing rods are twisted into a coil shape to form a spiral part, and A slope reinforcement method characterized in that the reinforcing rod is penetrated into the ground while being rotated in the helical direction of the helical part, and is fixed in the ground with the helical part as an anchoring end.