JPS5829378B2 - Anchor construction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves injecting pressurized fluid from within a perforated casing pipe with a large number of through holes in the peripheral wall to penetrate the casing pipe into the ground, and then injecting the casing pipe with a packer at the tip. Inserting a material injection pipe into the casing pipe and press-filling the injection material into the casing pipe,
The anchor construction method is characterized in that the injection material injection pipe is pushed back at the open end 1 of the perforated casing pipe by the injection material injection reaction force applied to the packer, and its purpose is to achieve simple construction and high reliability. The purpose of this invention is to provide an improved anchor construction method with a high level of performance.

In the present invention, instead of bolts that are anchored to the ground as in the anchor method, a perforated casing pipe with a large number of through holes bored in the surrounding wall is used, and the earth is ground from within the perforated casing pipe. The casing pipe is easily penetrated into the ground by injecting pressure fluid into the mountain and excavating the ground.

After the casing pipe has penetrated the ground to a predetermined depth, the casing pipe is left in position 11, and then an injection material injection pipe with a packer at the tip is inserted into the casing pipe and injected. Since the material is press-fitted, the injection material is filled into the casing pipe and at the same time permeates into the ground through the through hole drilled in the peripheral wall of the casing pipe, and thus the casing pipe is inserted into the ground. It is anchored in one piece on the mountain.

At this time, a reaction force at the time of press-fitting the injection material acts on the packer at the tip of the injection material injection pipe, and the injection pipe is pushed back inside the casing pipe, and as a result, the injection material is interrupted inside and outside the casing pipe. It is continuously injected and loaded.

After anchoring the perforated casing pipe to the ground,
The anchor construction method is completed by introducing prestress into the casing pipe using a known method.

According to the present invention, the casing pipe is penetrated into the ground by injecting pressurized fluid from inside the perforated casing pipe which substitutes for the anchor bolt, so drilling holes and inserting the anchor bolt are not necessary. It will be done in the same process, simplifying the construction.

The casing pipe penetrated into the broken ground prevents the soil on the outer periphery of the pipe from collapsing into the excavated part, and there is no risk of adversely affecting the subsequent mortar injection filling operation into the pipe.

Furthermore, in the present invention, the injection material is press-fitted by inserting the injection material injection pipe having a packer at the tip into the perforated casing pipe penetrated into the ground, so that the injection reaction force of the injection material is reduced. is applied to the packer, and as the injection filling operation progresses, the injection material is pushed back from the casing pipe to the open end side, and the casing pipe is densely filled with the injection material, A part of the injection material penetrates into the surrounding soil through the holes in the perforated casing pipe peripheral wall,
In this way, the casing pipe is anchored integrally to the earth, and the resistance to pulling out the casing pipe is increased.

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

Reference numeral 1 denotes a perforated casing pipe having a desired cross-sectional shape such as circular or polygonal, and a large number of through holes 2 of arbitrary shapes are bored in its peripheral wall.

Then, an air pipe 3 is inserted into the casing pipe 1, and pressurized air is injected from the air pipe 3 through a pump (not shown) connected to the casing pipe 3 to dig into the ground 4, and the casing pipe 1 is penetrated into the ground 4 (see Fig. 2), and when the casing pipe 1 has penetrated a predetermined length, the air pipe 3 is pulled out and a packer 5 made of an elastic material having an outer diameter approximately equal to the inner diameter of the casing pipe 1 is inserted. Insert the mortar injection vibro provided at the tip into the tip of the casing pipe 1 (see Figure 3), and insert the mortar injection machine (see Fig. 3) connected to the mortar injection vibro.
When mortar and lua are press-fitted through a hole (not shown), the mortar 7 is filled into the perforated casing pipe 1, and a part of the mortar 7 is divided into the earth 4 through the through hole 2 around the outer circumference of the casing pipe 1. On the other hand, the reaction force of the mortar injection pressure is applied to the packer 5, and the mortar injection vibro is pushed back toward the open end side of the perforated casing pipe 1 as mortar press-in progresses.

After completing the mortar injection work, the mortar injection vibro is removed (see FIG. 4), and prestress is introduced into the casing pipe 1 by a known method to complete the entire process.

In the present invention, pressurized water may be injected into the ground from within the casing pipe instead of the pressurized air, and other grouts or injection agents may be used in addition to mortar as the injection material. .

Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to such female embodiments, and may be modified in various designs without departing from the spirit of the present invention. be.

[Brief explanation of the drawing]

Figures 1 to 4 are vertical cross-sectional views showing the steps of an embodiment of the anchor construction method according to the present invention, Figure 5 is a partial vertical cross-sectional view of a perforated casing pipe, and Figure 6 is a longitudinal front view of the same. It is a diagram. 1...Perforated casing pipe, 2...
Through hole, 3... air pipe, 4... earth, 5... packer 6... mortar injection high, 7... mortar.

Claims (1)

[Claims] 1. Pressurized fluid is injected from inside a perforated casing pipe with a large number of through holes in the surrounding wall to penetrate the casing pipe into the ground, and then the injection material injection pipe having a packer at the tip is inserted into the casing pad part. An anchor construction method characterized by inserting the injection material into the casing pipe and press-filling the injection material into the same casing pipe, and pushing back the injection material injection pipe at the open end 1 of the perforated casing pipe by the injection material press-in reaction force applied to the packer. .