JPH07109726A - Adjustment method of solidified material diameter in molding of cylindrical solidified material by use of telescopic pipe and device thereof - Google Patents

Abstract

PURPOSE:To efficiently mold a cylindrical solidified material having a specified diameter in a deep depth to economize construction materials, by crossing high pressure jets of which injection angle can be adjusted from at least two nozzles and jetting a material. CONSTITUTION:The whole of a telescopic pipe is inserted in an excavated hole. A triple pipe 15 is extended and nozzles N1, N2 are lowered to the bottom of the excavated hole. High speed jet streams J1, J2 are ejected from the nozzles N1, N2 at a crossing angler. At the same time, while rotating the triple pipe 15, it is pulled up. In this time, the jet J1, J2 energy is reduced due to mutual collision of these jet streams. And at the same time, a cylindrical solidified material H having the distance between the axial line A of the triple pipe 15 and the intersection P as a radius R is created. The radius R is optionally decided by adjusting the jet angles of nozzles N1, N2 to set the crossing angle alpha.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for adjusting the outer diameter of a solidified body in forming a solidified columnar body using a telescopic pipe.

[0002]

2. Description of the Related Art A method of forming a columnar solidified body in the ground by a high pressure jet jet to improve the ground is well known.

The jet grouting method, which is one of the methods, is a method of excavating the ground by a high-speed jet jet of ultra-high pressure water and compressed air, filling a solidifying material, and forming a columnar solidified body. The high-speed jet jet connects the triple-tube swivel with ultra-high-pressure water, compressed air, and solid material hoses,
It is designed to eject from a nozzle connected to the swivel via a triple pipe.

[0004]

In such a construction method, since the jet jet reach distance varies depending on the nature of the ground, a large amount of ultra-high pressure water, compressed air and solidifying material are jetted,
The outer diameter of the columnar solidified body is made larger. Therefore, there is a waste of materials and power.

Further, in the case of forming a columnar consolidated body at a large depth, it is necessary to extend a triple pipe.

However, the splicing of the triple pipe is very troublesome due to its structure, and the working efficiency is poor.

The present invention relates to a method and apparatus for adjusting the outer diameter of a solidified body in the formation of a solidified columnar body using a telescopic pipe, which is capable of efficiently forming a solidified columnar body having a predetermined outer diameter at a large depth to save materials. Is intended to provide.

[0008]

According to the method of the present invention, at least two nozzles provided at intervals in the longitudinal direction of a telescopic pipe are used when forming a columnar solidified body in the ground by a high pressure jet jet. It is characterized in that high-pressure jet jets with adjustable jet angles are jetted to intersect each other, and a columnar solidified body having a predetermined outer diameter is obtained depending on the crossing position of these high-pressure jet jets.

The apparatus according to the present invention is provided with a telescopic pipe, at least two nozzles provided at intervals in the longitudinal direction of the telescopic pipe, and an ejection angle adjusting means for these nozzles.

[0010]

According to the present invention, when the high-pressure jet jets jetted by adjusting the jet angles from two or more nozzles intersect, the energy decreases at the intersection, and the interval between the intersection and the triple tube axis is the radius. A columnar solid is obtained.

Further, by extending the triple pipe and lowering the nozzle, it is possible to form a columnar consolidated body at a large depth with good working efficiency.

In the present invention, the telescopic pipe is positioned to insert the first stage pipe, then the second stage pipe is lowered and inserted, and finally the triple pipe is lowered to the bottom of the drill hole. Then, when a high-pressure jet jet whose jetting angle can be adjusted is crossed and jetted from at least two nozzles and pulled up, a cylindrical solid body having a predetermined outer diameter can be formed at a large depth.

Further, according to the present invention, it is possible to form a columnar consolidated body at a large depth. For example, in the present invention, the ground is excavated by the excavation means (excavation bit, monitor, etc.) while rotating the telescopic pipe provided with the excavation means at the lower end. After that, a high-pressure jet jet whose jetting angle can be adjusted is crossed and ejected from a nozzle provided on at least two stirring blades and is pulled up to form a cylindrical solid body having a predetermined outer diameter at a large depth. . In this case, slime is jetted to the ground through the gap between the drill hole and the telescopic pipe. After the construction, the ground improvement agent is ejected to fill up the hole while pulling up the telescopic pipe.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a triple pipe building facility.

In FIG. 1, a cable 12 wound around a cable reel 11 of a mobile crane 10 is hung down via a cable guide roller 13, and the end of the cable 12 has a triple pipe swivel of a triple pipe device M. 17 are suspended. The telescopic pipe 20 of the triple pipe apparatus M is held by the front frame 14 of the mobile crane 10.

2 to 4, in the lower part of the triple pipe 15 of the triple pipe device M, there are provided two nozzles N1 and N2 having an injection angle adjustable by an injection angle adjusting means (not shown) at intervals d. At the top, a triple tube swivel 1
7 is provided. The triple pipe swivel 17 includes an ultra-high pressure water hose B, a compressed air hose C, and a solidifying material hose D.
Are connected respectively.

The telescopic pipe 20 is composed of a one-stage pipe 21 which is an outer cylinder and a two-stage pipe 22 which is an inner cylinder.
It is locked in the rotational direction by a plurality of indicia portions a in the vertical direction (three in the illustrated example, which are equidistantly arranged on the circumference). And triple tube 1
Reference numeral 5 also serves as a three-stage pipe, and the two-stage pipe 22 has the above-mentioned in basket portion a.
Is locked in the rotational direction by.

Next, a mode of forming the columnar consolidated body will be described with reference to FIGS. The lengths of the pipes 21 and 22 and the triple pipe 15 in these drawings are shown in a reduced scale with respect to FIG.

The telescopic pipe 20 which is contracted as a whole is centered on the drill hole in a known manner (FIG. 5).

Then, the entire pipe 20 is inserted into the excavation hole (FIG. 6).

Next, the two-stage pipe 22 is extended and the nozzles N1 and N2 are lowered (FIG. 7).

Finally, the triple pipe 15 is extended and the nozzle N
1. Drop N2 onto the bottom of the borehole (Fig. 8).

Next, high-speed jet jets J1 and J2 are jetted from the nozzles N1 and N2 at a crossing angle α, and the triple pipe 15 is pulled up while rotating. Then, the jet flows J1 and J2 are reduced in energy by collision with each other at the intersection P, and a columnar solidified body H having a radius R between the axis A of the triple pipe 15 and the intersection P is formed. This radius R is equal to the nozzle N1,
It can be set arbitrarily by adjusting the injection angle of N2 by the injection angle adjusting means and determining the crossing angle α.

Although not clearly shown, it is also preferable to excavate the ground to a predetermined depth by providing an excavating bit or the like at the tip portion of the telescopic pipe 20 and extending downward while rotating the telescopic pipe 20. .

[0026]

As described above, according to the present invention, it is possible to construct a columnar solidified body having a predetermined outer diameter at a large depth with good working efficiency, and to save materials.

Further, since the construction is carried out in various working modes based on the columnar solid to be formed, the characteristics of the working ground, etc., good ground improvement can be carried out.

[Brief description of drawings]

FIG. 1 is a side view showing an example of a triple pipe building device.

FIG. 2 is a side view showing a triple pipe device.

FIG. 3 is a side sectional view of FIG.

FIG. 4 is a sectional view perpendicular to the axis of FIG.

FIG. 5 is a side view illustrating centering of a triple pipe built-in mode.

FIG. 6 is a side sectional view for explaining a telescopic pipe insertion state.

FIG. 7 is a side sectional view for explaining a two-stage pipe extended state.

FIG. 8 is a side sectional view for explaining a triple pipe extended state.

FIG. 9 is a side sectional view for explaining a mode of forming a columnar solidified body.

[Explanation of symbols]

 B ... Ultra-high pressure water hose C ... Compressed air hose D ... Solidified material hose H ... Columnized solidified body J1, J2 ... High-speed jet jet M ... Triple tube device N1, N2.・ ・ Nozzle P ・ ・ ・ Intersection R ・ ・ ・ Radius α ・ ・ ・ Intersection angle 10 ・ ・ ・ Crane truck 11 ・ ・ ・ Cable reel 12 ・ ・ ・ Cable 13 ・ ・ ・ Cable guide roller 14 ・ ・ ・ Front frame 15・ ・ ・ Triple pipe 17 ・ ・ ・ Triple pipe swivel 20 ・ ・ ・ Telescopic pipe 21 ・ ・ ・ 1 stage pipe 22 ・ ・ ・ 2 stage pipe

Claims (2)

[Claims] 1. When forming a columnar solidified body in the ground by a high-pressure jet jet, at least two nozzles provided at intervals in the longitudinal direction of the telescopic pipe intersect a high-pressure jet jet with an adjustable jet angle. A method for adjusting the outer diameter of a solidified body in the formation of a solidified columnar body using a telescopic pipe, characterized in that the solidified body having a predetermined outer diameter is obtained by intersecting positions of these high-pressure jet jets. 2. A telescopic pipe comprising a telescopic pipe, at least two nozzles provided at intervals in the longitudinal direction of the telescopic pipe, and an ejection angle adjusting means for these nozzles. A device for adjusting the outer diameter of a solid body used in forming a columnar solid body.