JPH06167022A - Under hydraulic pressure water cut-off method for anchor fixing part - Google Patents

Abstract

PURPOSE:To prevent under hydraulic pressure from flowing out of a single pipe at the time of drawing the single pipe. CONSTITUTION:An anchor material 10 is so constructed that plural laser packers 17, 17b are provide on plural projecting parts and recessed parts 15 formed on a fixing part A by bundling plural PC steel stranded wires 11 a round a filling pipe 12, and it is inserted in a grout material 31 in a drilled single pipe 1. At the time of drawing the single pipe 1, artesian water F when the laser packers 17a, 17b are energized by artesian water F to be pressed to the inner surface of the single pipe 1 is prevented from flowing out from the interior of the single pipe 1 to the mouth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of stopping water at an anchor fixing portion under pressured water when, for example, an anchor body holding a retaining wall is constructed.

[0002]

2. Description of the Related Art When constructing an anchor body, as shown in FIG. 14, when drilling a single pipe having a Kronen bit 5 at its tip, that is, a casing 1A, there is no spring water from the inside of the casing 1A. However, since the water supply and slime indicated by the arrow D pass through the outer peripheral portion of the casing 1A as indicated by the arrow E, the back surface of the earth retaining wall 32 is easily loosened. Therefore, when the mouth pipe 37 is provided to inject the chemical solution, There is.

Next, as shown in FIG. 15, when the casing 1A is pulled away from the bit 5, the pressurized water indicated by the arrow F flows out and the grout material is also pushed out. As a result, the proof stress of the fixing portion A of the anchor body C1 may not be obtained. Note that, as is well known, the free length portion B does not have a problem of anchor proof stress.

It is an object of the present invention to provide a method of stopping water in an anchor fixing portion under pressured water, which prevents the pressured water from flowing out of the single tube when the single tube is pulled out.

[0005]

According to the method of the present invention, a single pipe having a removable Kronen bit at its tip is drilled, and cement milk is filled in the single pipe with a grout hose. Then, a plurality of PC steel wires are bundled around the injection pipe to form a plurality of protrusions and recesses in the fixing portion, and an anchor material provided with a plurality of leather packers is inserted in the recesses, and then the single pipe is inserted. At the time of pulling out, the leather packer prevents the pressurized water from flowing out of the single pipe.

[0006] It is preferable that the above-mentioned leather packer is formed in a curved surface shape whose diameter expands toward the bit side, and two pieces are provided, but three pieces may be provided.

[0007]

According to the present invention, when the single pipe is pulled away from the bit, the leather packer is urged by the pressurized water to come into pressure contact with the inner surface of the single pipe, and the pressurized water flows out from the single pipe to the mouth. Surely prevent.

[0008]

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

FIG. 1 shows a casing generally designated by 1 for use in the present invention. This casing 1
Connects the casing units 2 and 2 with a casing coupling 3, and at the tip thereof, a Kronen bit 5 with a check valve is provided via a casing head 4 so as to be detached by pulling out the casing 1. There is.

2 to 5 show an assembled anchor material generally designated 10 used in the present invention, which anchor material 10 is for a so-called VSL anchor construction method. The anchor body 10 includes a plurality of (7 in the illustrated example) PC steel stranded wires 11 and an injection pipe 12.
And around the fixing portion A at a plurality of locations (3 in the illustrated example).
The protrusions 14 and the recesses 15 are formed by the spacers 13 at the locations.

As shown in FIGS. 6 to 8, the fixing portion A is provided with a cone-shaped pilot cap 16 with a stopper at its tip, the diameter of which is expanded to the free length portion B side, and the concave portion 1
5, a fixed pipe 18 fixed to the PC steel strand 11 by a tightening bolt 19 is provided.
8, a threaded portion 18a is screwed, and a ring-shaped protrusion P
Are welded and fixed to the fixed pipe 18. A razor pipe 17a having an open tip is fitted and inserted outwardly in the radial direction of the protrusion P, and another razor packer 17b is further provided via a spacer 20 and fixed by a nut 21 screwed with the screw portion 18a. Has been done.

On the other hand, the outer periphery of the free length portion B is covered with a sheath 22, and the boundary with the fixing portion A is covered with a water-stopping asphalt black tape 23. The inside is filled with rust preventive oil 24, and the inside of the tape 23 portion is filled with water stopping asphalt 25. 2, reference numeral 34 is an injection hose, 35 is a mouth packer, and reference numeral 3 in FIG.
6 is a putty still water sealing.

Next, the manner of constructing the anchor body will be described. First, as shown in FIG. 9, the casing 1 is rotated, and the casing 1 is set by drilling holes with the Kronen bit 5.

Next, the grout hose 30 is inserted to the inner tip of the casing 1, and the grout material 31 is injected and filled.

Then, as shown in FIG. 10, the anchor material 10 is inserted to the inner tip of the casing 1. On this occasion,
The grout hose 30 is pulled out while bleeding air.

Next, as shown in FIG. 12, the casing 1 is rotationally pulled out in the non-excavation direction, the Kronen bit 5 is detached, and then the casing 1 is pulled out by applying a pulling pressure. At this time, the leather packers 17a and 17b are urged by the pressurized water F to come into pressure contact with the inner surface of the casing 1, and prevent the pressurized water F from flowing out through the inside of the casing 1. If the degree of pressure contact between the leather packers 17a and 17b is small, grout material is injected to increase the applied pressure.

Finally, as shown in FIG. 13, when the casing 1 is pulled out, the earth retaining wall 32 and the water stop box 3 are removed.
The grout material 31 is injected into the portion 3 and 3 by the injection hose 34 to form the mouth packer 35, the spring water from the free length portion B is stopped, and then the grout material is injected from the injection pipe 12 to fix the anchor body. Build C and finish.

[0018]

As described above, according to the present invention, it is possible to prevent the pressurized water from flowing out of the casing by the leather packer and improve the yield strength of the anchor body.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a casing used in the present invention.

FIG. 2 is a side view showing an anchor material used in the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along the line BB of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

FIG. 6 is a side view showing a tip portion of a casing.

FIG. 7 is a side sectional view showing the area around the leather packer.

FIG. 8 is a view on arrow D of FIG.

FIG. 9 is a side cross-sectional view showing a hole making step in an anchor body construction mode.

FIG. 10 is a side sectional view showing a grout material filling step.

FIG. 11 is a side sectional view showing an anchor material inserting step.

FIG. 12 is a side sectional view showing a casing drawing process.

FIG. 13 is a side sectional view showing a completed state of the anchor body.

FIG. 14 is a drawing corresponding to FIG. 9 showing a conventional anchor body construction mode.

FIG. 15 is a drawing corresponding to FIG. 12;

[Explanation of symbols]

 A ... Fixing part B ... Free length part C, C1 ... Anchor body F ... Pressurized water 1, 1A ... Casing 2 ... Casing unit 3 ... Casing coupling 4. ..Casing head 5 ... Kronen bit 10, 10A ... Anchor material 11 ... PC steel strand 12 ... Injection pipe 13 ... Spacer 14 ... Projection 15 ... Recess 16 ... Pilot cap 17a, 17b ... Leather packer 18 ... Fixed pipe 19 ... Fixing metal 20 ... Spacer 21 ... Nut 22 ... Sheath 23 ... Water-stop asphalt 24 ...・ Rust preventive oil 30 ・ ・ ・ Grout hose 31 ・ ・ ・ Grout material 32 ・ ・ ・ Soil retaining wall 33 ・ ・ ・ Water stop box 34 ・ ・ ・ Injection hose 35 ・ ・ ・ Mouth packer 36 ・ ・ ・ Putty water stop sheet Packaging 37 ... mouth pipe

Claims (1)

[Claims] 1. A single pipe having a removable Kronen bit at its tip is drilled, cement milk is filled in the single pipe with a grout hose, and a plurality of twisted wires are injected into the cement milk. A plurality of protrusions and recesses are formed around the fixing portion by binding them together, and after inserting the anchor material provided with a plurality of leather packers in the recesses, when pulling out the single pipe, the leather packer pressurizes water. A method of stopping water in an anchor fixing portion under pressured water, characterized by preventing outflow from the inside of the single pipe.