JPH0216215A - Closer for earth anchor - Google Patents

Abstract

PURPOSE:To prevent the occurrence of spring water by a method in which a film to be dissolved upon absorption of water is attached to the periphery of an anchor of PC steel wire, etc., and a swelling material to be expanded upon absorption of water is packed into the film to close the anchor hole. CONSTITUTION:A water-soluble resin film 11 of polyvinyl alcohol, polyethylene, etc., with a water injection port 13 is provided to the periphery of a given place of an anchor 3, and both ends of the film 11 are fixed with a tape. A hose 4 is inserted into the port 13 and a swelling paste material 12 is packed into the film 11. The anchor 3 is inserted into an anchor hole and fixed. The film 11 comes into contact with water and is dissolved in the anchor hole, and the surface of the material 12 is exposed to stop the flow of water by swelling with water.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a closure device for an earth anthole, which has excellent water-stopping properties and ease of handling.

(2) The closure device for an earth anchor according to claim (1), wherein the inner diameter of the film is approximately equal to the diameter of the anchor hole.

(3) A closure device inserted into an anchor hole, which includes a shape-retaining cylinder with a hole on its circumferential surface, and a cloth bag that continuously covers the inside and outside of this shape-retaining cylinder (prior technology). When anchoring the earth anchor, it is necessary to take measures to prevent water from springing outside the hole.

Currently, as a measure against this problem, it has been proposed to insert various packers (cold-closing devices) into the anchor hole to stop the water.

Problems to be solved by the present invention> Conventional water stop technology has the following problems.

B) Conventional backers cannot follow the gaps and continuous irregularities on the circumferential surface of the PC steel wire, PCI stranded wire, etc. that make up the anchor.

Therefore, water flows out along these gaps and unevenness,
Concerns remain regarding the water-stopping effect.

<mouth> It is troublesome to install the packer.

<Object of the present invention> The present invention has been made in view of the above points, and an object of the present invention is to provide a closure device for an earth anchor that has a high water-stopping effect and is easy to handle.

<Configuration of the present invention> Next, one embodiment of the present invention will be described.

<A> Closure device An example of the closure device 1 is shown in FIG. 1.2.

The closure device 1 includes a cylindrical film 11 and a cylindrical film 11.
It is formed by the swelling material 12 filled in the inside (R).

Exit> Film The film 11 is formed of an extremely thin sheet into a cylindrical shape with both ends open, and has a cylindrical injection part 13 on the side thereof.

The diameter of the film 11 is formed to be approximately equal to that of the anchor hole 2.

The outer diameter of the hole 2 is determined by the standard, so if you prepare the film 11 according to this standard, you can use the films j and 11 with different diameters depending on the hole 2 at the site. can.

The film 11 and the injection part 13 are made of a material that has appropriate flexibility and strength and dissolves when water is absorbed, such as poval (polyvinyl alcohol) or a resin such as polyethylene.

The reason why the film 11 and the injection part 13 are made of a soluble material is to avoid inconvenience during handling due to the strong adhesive property of the swelling material 12, and to make it easier to insert the swelling material 12 into the hole 2 of the amplifier 1. This is to simultaneously achieve the two purposes of swelling after drying.

That is, if you try to handle the swelling material 12 with it exposed,
It is expected that dirt or the like may adhere to hands or clothes, or may adhere to the swelling material 12.

Further, if the inconvenience of handling is simply to be solved, it is sufficient to cover it with another water-blocking member, but it is not possible to impregnate the swelling material 12 with water and cause it to swell.

Therefore, the surface of the swelling material 12 is made non-adhesive and the surface of the swelling material 12 is made non-adhesive.
1, these disadvantages can be avoided at the same time.

(c) Swelling material The swelling material 12 is a known polymeric material that swells to several times its volume by absorbing water.

The swelling material 12 is a two-component mixture type in which a curing agent is added to an irregularly shaped main material, such as polyurethane, at an appropriate mixing ratio, and has a swelling ratio of 4 times, a specific gravity of 1.43, a hardness of 30 C, and an elongation of 1.
100%, tensile strength 14.8 kg/cut can be used.

The swelling material 12 exemplified above has strong adhesive strength, elasticity, and water impermeability.

<Function 3> Next, a water-stopping method for an earth anchor using the closure device 1 will be described with reference to FIG. 1.2.

<A> Hole Drilling Similar to the conventional earth anchor construction method, anchor holes 2 are drilled into the ground to a predetermined depth.

<Open> Assembling the anchor Outside the hole J-hole 2, assemble the anchor 3, such as an unbonded type or an uncoated PCI wire, according to a known procedure.

<C> Attachment of the closing device <B> Attachment of the film: Next, the film 11 is placed on the anchor 3 at a predetermined position, and tape or the like is attached to both ends of the film 11 to fix it.

The film 11 is attached to the anchor hole 2 and the anchor 3 so that when the anchor 3 is inserted into the anchor hole 2, the closure bag ffl is located at the mouth of the anchor hole 2.
Calculate it from the total length of.

2> Filling with swelling material Next, the hose 4 is inserted into the injection part 13 and fixed by wrapping tape or the like, and a paste-like swelling material 12 is filled into the film 11 from a filling device on the base end side of the hose 4.

The swelling material 12 is pressed by the film 11 and formed into a cylindrical shape having a diameter approximately equal to the diameter of the anchor hole 2 .

After filling the swelling material 12, the injection part 13 is bent and fixed to the surface of the closure device 1 with tape or the like.

<2> Inserting the amplifier 1- Insert the amplifier 1- into the anchor hole 2 with the closure device 1 attached to the middle of the anchor 3.

At this time, since the surface of the swelling material 12 is covered with the non-adhesive film 11, there is no fear of adhesion.

When the anchor 3 is inserted to the bottom of the anchor hole 2, the cold closure device 1 is located near the mouth of the anchor hole 2.

Incidentally, when inserting the anchor 3, a fixing grout injection hose is inserted through the space between the anchor hole 2 and the closing device 1.

<E> Injection of grout Next, fixing grout such as mortar is injected into the bottom of the anchor hole 2 to fix the fixing length portion of the anchor 3.

Finally, remove the injection hose used to inject the fixing grout.

<F> When the swelling film 1.11 of the closure device comes into contact with water in the anchor hole 2 and dissolves, the surface of the swelling material 12 is exposed.

Over time, the swelling material 12 absorbs water and begins to expand as shown in FIG.

The swelling material 12 strongly adheres to the wall of the anchor hole 2 due to the swelling pressure generated in the direction of expanding the anchor hole 2.
Water is cut off between the hole wall and the swelling material 12.

In addition, due to the expansion pressure generated in the axial direction of the anchor 3, the swelling material 12 strongly adheres to the uneven portion of the circumferential surface of the anchor 3, so that the swelling material 12 and the uneven circumferential surface of the anchor 3 are tightly attached. The water will be completely shut off for a long time.

(In this case, the outflow of groundwater outside the hole is completely prevented.

With the water coming out from the mouth of the fixing anchor hole 2 of the anchor, the amplifier 1-
The proximal end of 3 is tightened with jacks or the like, and fixed using a known fixing tool.

Note that when tension is applied to the anchor 3, - the swelling material 12
It is expected that they will move together.

However, if the anchor 3 is an unbonded type anchor with a sheath, the swelling material 12 adheres to the sheath and allows the steel wire within the sheath to move, so the swelling material 12 will not move even if the steel wire is tensed.

Furthermore, even if the anchor 3 is of a type in which the steel wire is exposed, the elastic deformation of the swelling material 12 follows the movement of the anchor 3 and maintains the water-tight state.

<Other Examples> Another closure device 5 using a swelling material is shown in FIG.

<A> Configuration This closure device 5 includes a shape-retaining cylinder 5 having a hole 51 on the circumferential surface.
2, a cloth bag 53 that continuously covers the inside and outside of the shape-retaining cylinder 52, and a swelling material 54 applied in a band shape to the outer periphery of the cloth bag 53.
and a filler 55 that covers the entire surface of the swelling material 54.
It consists of an injection port 56 guided into a cloth bag 53.

The swelling material 54 and film 55 are the same as those in the previous embodiment.

How to use: Insert the closure device 5 into the anchor exposed in the hole.
Exterior.

Then, the cloth bag 53 is inflated by injecting a water stop material such as high viscosity asphalt or water glass from the injection water source 56,
The inner peripheral surface of the cloth bag 53 is pressed against the soil, and the outer peripheral surface of the cloth bag 53 is pressed against the earth.

When the film 55 on the outermost surface of the expanded cloth bag 53 comes into contact with water and dissolves, the swelling material 54 is exposed.

Due to the expansion of the swelling material 54, the pressure against other threads is further increased, and a high water-stopping effect can be obtained.

Figure 2: A cross-sectional view of the vicinity of the anchor anchorage when water is stopped at the mouth of the anno-hole with a closing device. Figure 3: A cross-sectional view of the 21st I[[-I[1. Partial sectional view of closure device (effects of the present invention) The present invention provides the following effects.

(A) Even if there are gaps or continuous irregularities on the peripheral surface of the PC steel wire or PCllI stranded wire that constitute the anchor, the swelling material will compress and provide an extremely high water-stopping effect.

<Exposure> Since the surface of the swelling material is coated with a film that dissolves in water, adhesion during handling can be reliably prevented and handling is easy.

<C> The structure is suitable for mass production in factories.

(2) Can be easily installed even with unskilled tools.

[Brief explanation of the drawing]

Claims (3)

[Claims] (1) A closure device inserted into an anchor hole, which has an injection part on the side of a cylindrical body with both ends open, and a film made of a material that dissolves when it absorbs water; and a film around the anchor. A closure device for an earth anchor comprising a water-swellable swelling material filled in a sealed space between a surface and the film. (2) The closure device for an earth anchor according to claim (1), wherein the inner diameter of the film is approximately equal to the diameter of the anchor hole. (3) A closure device inserted into an anchor hole, which includes a shape-retaining cylinder having a hole on its circumferential surface, a cloth bag that continuously covers the inside and outside of this shape-retaining cylinder, and a uniform layer thickness around the outer periphery of the cloth bag. The earth anchor consists of a water-swellable swelling material applied in a strip shape, a film made of a material that dissolves when absorbed by water and covering the entire surface of the swelling material, and an injection hose guided inside a cloth bag. Occlusion device.