JP2865508B2 - Water stopping method of anchor anchoring part under pressurized water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As shown in FIG. 14 when constructing an anchor body, when drilling with a single tube having a kronen bit 5 at its tip, that is, a casing 1A, there is no spring water from inside the casing 1A. However, since the back surface of the retaining wall 32 is easily loosened because the water supply and slime indicated by the arrow D communicate with the outer peripheral portion of the casing 1A as indicated by the arrow E, a case is provided in which a mouth pipe 37 is provided and a chemical solution is injected. 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 fixing portion A of the anchor body C1 may not have sufficient strength. It should be noted that the free length portion B has few anchor strength problems as is well known.

[0004] It is an object of the present invention to provide a method for stopping water of 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 tube having a detachable kronen bit at the end thereof is drilled, and the single tube is filled with cement milk by a grout hose. Then, a plurality of PC steel strands are bound around an injection pipe to form a plurality of protrusions and recesses in a fixing portion, and an anchor material provided with a plurality of leather packers in the recesses is inserted. At the time of pulling out, it is characterized in that the pressurized water is prevented from flowing out of the single pipe by the leather packer.

The above-mentioned leather packer is formed in a curved surface shape having a diameter increased toward the bit, and it is preferable to provide two leather packers, but three leather packers 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 press against the inner surface of the single pipe, and the pressurized water flows out of the single pipe to the mouth. To reliably prevent

[0008]

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

FIG. 1 shows a casing 1 generally used in the present invention. This casing 1
The casing unit 2 is connected to the casing unit 2 by a casing coupling 3, and a kronen bit 5 with a check valve is provided at a distal end via a casing head 4 so as to be detached by pulling out the casing 1. I have.

FIGS. 2 to 5 show an assembled anchor member generally indicated by reference numeral 10 used in the present invention, and the anchor member 10 is for a so-called VSL anchor method. The anchor body 10 is formed by inserting a plurality of (seven in the illustrated example) PC steel strands 11 into an injection pipe 12.
Around the fixing portion A (3 in the illustrated example).
(A location), a protrusion 14 and a recess 15 are formed by the spacer 13.

As shown in FIGS. 6 to 8, the fixing portion A is provided with a cone-shaped pilot cap 16 having a stopper and having a diameter increased toward the free length portion B at the end thereof.
5 is provided with a fixed pipe 18 fixed to the PC steel stranded wire 11 by a tightening bolt 19.
8 is provided with a threaded portion 18a, and a ring-shaped projection P
Are fixed to the fixed pipe 18 by welding. A razor pipe 17a having an open end is fitted into the projection P radially outward, and another razor packer 17b is provided via a spacer 20. The razor pipe 17a is fixed by a nut 21 screwed to the screw portion 18a. Have been.

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 waterproof asphalt black tape 23. The inside is filled with rust preventive oil 24, and the inside of the tape 23 is filled with waterproof asphalt 25. Note that reference numeral 34 in FIG. 2 denotes an injection hose, reference numeral 35 denotes a mouth packer, and reference numeral 3 in FIG.
6 is a putty waterproof sealing.

Next, the mode of construction of the anchor body will be described. First, as shown in FIG. 9, the casing 1 is rotated, and holes are drilled with the Kronen bit 5 to set the casing 1.

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

Next, as shown in FIG. 10, the anchor member 10 is inserted to the inner end 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-digging direction and the krone bit 5 is detached. Then, the pulling pressure is increased and the casing 1 is pulled out. At this time, the leather packers 17a and 17b are urged by the pressurized water F to press against the inner surface of the casing 1 and prevent the pressurized water F from flowing out through the inside of the casing 1. When the degree of pressure contact between the leather packers 17a and 17b is small, grout is injected to increase the additional pressure.

Finally, as shown in FIG. 13, when the casing 1 has been pulled out, the retaining wall 32 and the waterproof box 3
The grout material 31 is injected into the portion 3 with an injection hose 34 to form a mouth packer 35. After stopping the spring water from the free length portion B, the grout material is injected from the injection pipe 12, and the anchor body is formed. Build C and finish.

[0018]

As described above, according to the present invention, the pressurized water can be prevented from flowing out of the casing by the leather packer, and the strength of the anchor body can be improved.

[Brief description of the 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 member used in the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along the line CC of FIG. 2;

FIG. 6 is a side view showing a distal end portion of a casing.

FIG. 7 is a side sectional view showing the periphery of a leather packer.

FIG. 8 is a view taken in the direction of arrow D in FIG. 7;

FIG. 9 is a side sectional view showing a hole drilling step in an embodiment of anchor body construction.

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 extracting step.

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

FIG. 14 is a view 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 section B: free length section 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 ... Protrusion 15 ... Recess 16 ... Pilot cap 17a, 17b ... Leather packer 18 ... Fixed pipe 19 ... Fixing bracket 20 ... Spacer 21 ... Nut 22 ... Sheath 23 ... Waterproof asphalt 24 ...・ Rust preventive oil 30 ・ ・ ・ Grout hose 31 ・ ・ ・ Grout material 32 ・ ・ ・ Retaining wall 33 ・ ・ ・ Water stop box 34 ・ ・ ・ Injection hose 35 ・ ・ ・ Mouth packer 36 ・ ・ ・ Pate stop water seal Packaging 37 ... mouth pipe

Claims (1)

(57) [Claims] 1. A single pipe having a detachable kronen bit at its tip is drilled, and cement milk is filled into the single pipe with a grout hose, and a plurality of stranded wires are injected into the cement milk using a pipe. When the single tube is pulled out after inserting an anchor material having a plurality of protrusions and recesses formed in the fixing portion and provided with a plurality of leather packers in the recesses after being bound around the fixing portion, the pressurized water is removed by the leather packers. A method for preventing water from flowing out of the single pipe, wherein the anchor fixing portion is under water under pressure.