JPS5925990Y2 - Earth reinforcement material - Google Patents

Description

[Detailed description of the invention] For shield construction method, reinforcement of the face when excavating the face in tunnel construction, etc., reinforcement of the ground when cutting a steep slope, etc., a hole is drilled into the ground and tensile reinforcing material is inserted. This method is often used.

The tensile reinforcing material used at this time is often cut as the excavation of the ground progresses.

Therefore, it is advantageous if the tensile reinforcement has sufficient strength and is easy to cut.

The present invention aims to provide an improved ground reinforcement material that has such characteristics, and also serves as a hose for injecting filler into the drilled hole, and has increased adhesion resistance with surrounding filler. This was proposed for the purpose of this invention, and is characterized by being made by twisting together a hose for injecting a filling material into a hole in the ground and a fiber rope.

As mentioned above, the ground reinforcement material according to the present invention is constructed by twisting together a hose for injecting the filling material into the ground hole and a fiber rope such as a synthetic fiber rope with high tensile strength. As a result, a flexible and easy-to-cut ground reinforcement material is constructed, and the synthetic fibers exhibit the tensile strength of the material, and the filler material is injected using an injection hose. By twisting the hoses together, the minimum required hole diameter can be reduced.

In other words, when inserting the ground reinforcement material into the drilled hole, when the injection hose and the synthetic fiber rope are bundled without twisting, bands and spacers are attached, and the method involves pulling them in with Pc steel wire. I have no choice but to depend on it.

In this case, the required diameter of the reinforcing material inevitably increases.

On the other hand, when the injection hose and the synthetic fiber rope are twisted as in the present invention, the overall rigidity becomes high and insertion becomes easy, and in some cases, reinforcing material alone can be inserted, and This allows the diameter of the drilled hole to be reduced.

Furthermore, by twisting the fiber rope and the injection hose, the outer periphery of the ground reinforcing material of the present invention is provided with irregularities, thereby increasing the mechanical adhesion strength with the filler.

In addition, when the ground reinforcement material of the present invention is subjected to tensile force, untwisting is prevented because the fiber rope is restrained by the injection hose whose hollow part is filled with filler material and the filler material around the outer periphery of the reinforcement material. At the same time, the elongation rigidity also increases.

The present invention will be described below with reference to the illustrated embodiments.

In Figures 1 and 2, 1 is a filler injection hose made of vinyl chloride, etc., and the same hose 1 and 2 synthetic fiber ropes 2 made of polypropylene etc. are made in the same way as the rope. A ground reinforcing material is constructed by twisting them together using different methods.

It is also conceivable to use four strokes, six strokes, etc., if necessary.

As shown in Figure 3, the ground reinforcement material of this proposal is
The injection hose 1 is inserted into the injection hose 1 and a filling material 4 with good fluidity and less breathing, such as cement, bentonite, or air milk, is injected into the injection hose 1.The injection hose 1 and the synthetic fiber rope 2 are twisted By doing so, the minimum necessary diameter of the hole to be drilled in the hole part 3 can be made small, and an uneven surface is attached to the outer periphery of the ground reinforcing material of the present invention, which improves mechanical adhesion with the filler material as described later. The force of application increases.

That is, an injection hose 1, a synthetic fiber rope 2, and a filler material 4.
The net adhesion force between the reinforcing material and the filler material 4 acts as much as the contact area between them, but the contact area with the filler material 4 per unit length of the reinforcing material is increased by twisting the injection hose 1 and the synthetic fiber rope 2 together. Moreover, since the surface of the entire reinforcing material is formed with uneven parts, as shown by the dotted line in FIG. Adhesion resistance increases.

Furthermore, when manufacturing the reinforcing material, the injection hose 1 and the synthetic fiber rope 2 are twisted under a certain degree of tension.
The injection hose 1 is more rigid than the synthetic fiber rope 2 and has a greater restoring force when the tensile force is released, so after manufacturing, only the injection hose 1 will be in a nearly straight state, and the relationship between the injection hose 1 and the synthetic fiber rope 2 will be greater. As the unevenness formed in between becomes larger, the injection resistance of the filler decreases.

Furthermore, when the reinforcing material of the present invention is subjected to a tensile force, the synthetic fiber rope 2 is inserted into the injection hose 1 whose hollow part is filled with the filler material 4'.
By being restrained by the filler 4 on the outer periphery of the reinforcing material, untwisting is prevented and the elongation rigidity is also increased.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the earth reinforcement material according to the present invention, FIG. 2 is a longitudinal sectional side view thereof, and FIG. 3 is a longitudinal sectional view showing its usage state. 1... Injection hose, 2... Synthetic fiber rope.

Claims (1)

[Scope of utility model registration request] A flexible and easily cutable ground reinforcement material, which is made by twisting together a fiber rope and a hose for injecting filler into a ground hole.