JPS61186618A - Packer for earth anchor - Google Patents

Abstract

PURPOSE:To cause firm adhesion of a packer to a hole wall, by a method wherein a bottom member is placed to a packer body formed by a cylinder body made of a water permeable cloth, and a tensile material mounting cylinder and a grout pouring pipe mounting cylinder are located to the bottom member. CONSTITUTION:A bottom member 121 is mounted to at least the one end part of a packer body 11 formed with a cylinder body made of a water permeable cloth cylinder material. A tensile material mounting cylinder 131 and a grout pouring pipe mounting cylinder 141 are mounted to the bottom member 121 to form a packer 10. This enables simple and reliable mounting of a tensile material and a grout pouring pipe. Further, since no gap is provided at a mounting portion between the tensile material and a pipe, cement paste is prevented from leak, and enough expansion of the packer permits firm adhesion of the packer to an anchor hole wall.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a packer body made of a cloth cylinder, a bottom member provided at at least one end of the packer body, a tensile material mounting cylinder provided on the bottom member, and a grout injection pipe (
Regarding a packer for an earth anchor consisting of a hose) mounting tube.

The packer is manufactured so that it can freely correspond to the shape of the anchor hole, and is created by filling the grout material and expanding it under pressure to close the anchor hole and grout the anchoring part.

Traditionally, packers have a hollow-bottomed cylindrical body, and hoses such as tensile material and grout injection hoses, packer injection hoses, exhaust hoses, etc. are bundled and passed through the cylindrical packer, and the end of the packer is This was tied together, inserted into the anchor hole, and filled with grout to expand the packer to create an anchorage within the anchor hole. However, because the end of the packer was tied with the tensile material and hoses bundled, there was a gap between the tension material and the hoses, and between the bundle of the tension material and hose hole and the end of the packer. There is also a gap. Therefore, when grout is injected into the packer under pressure in this state, causing the packer to expand and adhere to the hole wall of the anchor hole, the inside of the packer is under pressure, so the grout is injected under pressure from the gap. Cement paste leaked out, and the packer could not be expanded sufficiently, making it difficult to bring the packer into close contact with the wall of the anchor hole.

The present invention improves the above-mentioned drawbacks, and provides a tensile material and packer injection pipe, a grout-sub-injection pipe,
To provide a packer for an earth anchor with a bottom that prevents gaps from forming between the packer and the tension material and hoses when pipes such as exhaust pipes or hoses are attached to the packer. .

It is.

The packer 10 is made of a water-permeable cloth bag, and includes a packer body // that is in close contact with the hole wall of the anchor hole, and a bottom member /2/, /2 that is sewn to at least one end of the packer body.
2, and a tension member mounting tube provided on the bottom member /3/, /3.
2 and pipe mounting tubes for grout injection pipes, packer injection pipes, exhaust pipes, etc. 1st~
In Figure 3, H1 pipe mounting tube is grout injection L pipe mounting tube l≠/, /1
2, but other embodiments include a packer injection pipe for injecting cement paste into the packer;
In order to attach the necessary pipes (hoses) such as the primary injection pipe for injecting cement paste into the hole expansion fixing section and the exhaust pipe to each pipe mounting pipe, each pipe mounting pipe is attached to the bottom member separately. It may be provided at /2/ and /22.

(How to use and effects) The usage and effects of the packer of the present invention will be described.

For example, in Fig. 2, a tensile material (not shown) is passed through one tensile material mounting B/3/, inside the packer body //, and the other tensile material mounting fRI3.2, and adhesive tape is applied on both mounting tubes. Twist the tension member and both mounting tubes to tightly fix them. Next, install the grout injection pipe (not shown) f! /1/, Inside the packer body, put Ganji through the grout injection pipe /lA2, and insert 2IF on both mounting tubes.
Twist the tape to tightly fix the grout injection pipe and both mounting tubes.

To install an earth anchor, first drill an anchor t hole, and then drill a hole expansion seam in the rock layer (see figure).
Anchor hole 30 and drill hole part 3 in the rock layer that will become the anchoring part
After cleaning the tensile member 20O, the anchor body 2 with the anchor fixing body 2/, packer 6-, spacer 22 attached in advance is inserted into one end of the tensile member 20O.

In this case, insert the grout injection hose into the anchor hole t while aligning the tension member 20 with the grout injection hose. Then, the end of the hose is covered with adhesive tape, and a through hole is provided at the position inside the packer.

Next, the anchor plate 23 is inserted from the other end of the tension member 20 and is locked in the anchor hole 30 or the hole holding pipe provided in the pressure receiving plate 110. Adjust plate 2I on top of the anchor plate! , and adjust the tension member 20 so that it passes approximately through the center of the anchor hole 30 and is approximately perpendicular to the upper surface of the adjustment plate 211.

Cement paste is then injected under pressure using a grouting hose. At this time, pressure is first injected into the packer, and when the pressure reaches a certain level, the adhesive tape, such as vinyl tape, at the end of the hose breaks, and the fixing section at the bottom (
(expanded hole) is filled under pressure. The time when the pressure suddenly increases throughout the hole wall is regarded as the time when the injection is completed, and the injection is terminated.

After checking the proof strength, tighten the tension member 20 and tighten the fixture 2.
3, it is fixed on the structure (pressure receiving plate>110).

According to the invention, by providing a tension material mounting tube and a grout injection pipe mounting tube on the packer body together with the bottom member, it is possible to easily and reliably attach the packer to the tension material and grout injection pipe (hose). Can be installed (
2) There is no gap between the tensile material and the pipe (hose) and the packer. (3) When the cement paste is injected under pressure from the grouting hose (pipe), the cement paste does not leak from the mounting part. Therefore, the packer can be sufficiently expanded to firmly adhere to the wall of the anchor hole, and the entire length of the packer becomes a strong anchoring part. When the packer is made of a strong cloth, such as a cloth, it can withstand great pressure, so it firmly adheres to the wall of the anchor hole and provides an even stronger fixing body, resulting in excellent effects.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a packer which is an embodiment of the present invention, in which a tension member mounting tube and a grout injection pipe (hose) mounting tube are respectively provided on the bottom member provided at one end of the packer body; FIG. 2 is a sectional view of a packer according to another embodiment of the present invention, in which both bottom members of the packer body are provided with a tension member and the pipe (hose) attachment tube, respectively. FIG. 3 is a cross-sectional view of a packer according to another embodiment of the present invention, in which a tension member mounting cylinder and the pipe (hose) mounting cylinder are respectively provided inside the packer main body. Fig. ψ is an explanatory view of constructing an earth anchor (rock anchor) using the packer of the present invention. 10: Packer //: Packer body /2/, /, 2
2: Bottom member /3/, /32: Tension material mounting tube /11/
,/lA2 Nigeloud injection pipe (hose) mounting tube 20
: Tensile material 3/: Hole expansion part in rock layer ≠0: Pressure receiving plate 2/: Hole-type anchor anchor base, 777

Claims (1)

[Claims] A packer body made of a water-permeable cloth cylinder and tightly attached to the hole wall of the anchor hole, a bottom member provided at at least one end of the packer body, a tension member mounting tube provided on the bottom member, and A packer for earth anchors, characterized by consisting of a grout injection pipe (or hose) mounting tube.