JPH04140318A - Anchor - Google Patents

Abstract

PURPOSE:To raise the efficiency of injection of grout by a method in which a tension member inserted with unbonded sheath is set on the sheath of free-long part connected to a fixed part, the joint of both sheaths is fixed with a water stopper, and both packing pipe and air-draw pipe are set. CONSTITUTION:The sheaths 1 and 2 of free-long part and fixed part which are connected are set in an excavated pit 3, and a tension member inserted with unbonded sheath 5 in the sheath 1 is exposed in the sheath 2 of the fixed part. A water stopper 8 is packed into the joint of both the sheaths 1 and 2 to integrate the sheaths 1 and 2 with the member 4. An air-draw pipe 7 is thrust through the water stopper 8 and set in the aperture of the members 4. A hardening material 9 such as cement-based grout is packed through the packing pipe 6 to the outside and inside of the sheath 2, and air and water are discharged through the pipe 7. The material 9 is then packed into even sheath 1. The injecting efficiency can thus be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an anchor, and particularly to an anchor that prevents the position of the sheath and the tension member from shifting.

(Conventional technology) Conventionally, an anchor as shown in FIG. 5 has been used.

That is, a plurality of tensile members are disposed within the irregularly shaped sheath portion whose entire length is integrated, and two injection pipes c and d are further disposed. One injection pipe C opens into the irregularly shaped sheath, and the other pipe d opens into the irregularly shaped sheath.

The hardening material e is injected from both the injection vibrators c and d, and the entire length of the inside and outside of the irregularly shaped sheath a is filled with the hardening material e and hardened.

(Problem M solved by this invention) The conventional techniques described above have the following problems.

<A> The irregularly shaped sheath a and the injection pipe C are fixed by a water stop material g at the innermost part of the irregularly shaped sheath a, but if this configuration is inserted into the drilled hole, the sheath 8 and the tension member The position of the anchor may shift and the anchor may not work as designed.

<g> A polyethylene source or the like may be used as the irregularly shaped sheath a, but the sheath a made of the same material covers the outer periphery regardless of the free length part and the fixed part of the tensile material.

Therefore, the strength is insufficient for the fixing part, which requires strength,
In cases where the corrosivity is particularly high in the upper part of the free length, conventional thin-walled polyethylene sources are not sufficient, and are often insufficient either way, resulting in half-hearted measures.

This invention was made to solve the above-mentioned problems, and its purpose is to provide an anchor that can be placed in a drilled hole as designed, and that can be protected and fixed with a sheath made of an appropriate material. do.

(Means for Solving the Problems) In the anchor according to the present invention, the free length sheath and the fixing part sheath are continuously arranged in a drilled hole. A polyethylene source can be used as the free length sheath, and a #4 irregularly shaped sheath can be used as the anchoring part sheath.

The tensile material inserted into the unbonded source is exposed within the free length sheath. Fill the joint between the free length sheath and the anchoring sheath with a waterproof material. This makes it possible to integrate the tensile member and the fixing section sheath.

The filling vibrator inserted into the front hole from the ground surface reaches near the innermost part of the fixing part sheath.

To vent air, place the pipe so that it passes through the stopper. At this time, the free length sheath and the fixing part sheath communicate with each other. Multiple pipes can be placed for air venting.

(Function) The hardening material is filled from the filling pipe, and the air inside the fixing section sheath is discharged from the pipe. When the hardening material is further filled, the hardening material that has filled the fixing part sheath passes through the air vent pipe and fills the free length sheath.

Since the free length sheath and the anchoring part sheath are integrally fixed by the water stop material, the sheath and the tensile member do not shift when inserted into the drilled hole.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

In the figure, 1 is a free length sheath, and 2 is a fixing part sheath. The free length sheath 1 is made of a polyethylene material which can be bent to some extent, and the fixing part sheath 2 is made of steel and has irregularities around the periphery. The free length sheath 1 and the fixing part sheath 2 are successively arranged in the drilled hole 3.

A plurality of tensile members 4 are disposed inside the free length sheath 1 and the anchoring sheath 2. The tension members 4 are inserted into the unbond source 5 inside the free length sheath 1, and the tension members 4 are inserted into the unbond source 5 inside the anchoring sheath 2. As the exposed tensile material 4, stranded copper wire, #l wire, etc. can be used.

Inside the free length part sheath 1 and the fixing part sheath 2, a filling vibro is written from the ground surface, and the filling vibro is made to reach near the innermost part of the fixing part sheath 2.

A water stop material 8 is filled in the connecting part between the free length sheath 1 and the fixing part sheath 2. As the water stop material 8, blown asphalt or epoxy resin can be used. The tensile material 4 and the geast 2 are fixed and integrated by this water stop material 8. Therefore, the positional relationship between the tension member 4 and the gist 2 will not shift in the subsequent work.

Before filling the water stop material 8, a pipe 7 is placed in advance to vent air. For air venting, the pipe 7 is arranged so as to penetrate the water stop material 8. As a result, the free length sheath 1 and the fixing section sheath 2 may be communicated through the air vent pipe 7. A plurality of air vent pipes 7 can be arranged in gaps between a plurality of tension members 4 as shown in FIG.

In the above state, a hardening material 9 such as cement grout is filled through a filling vibro. The hardening material 9 fills the inside and outside of the fixing section sheath 2, and the air and water inside the fixing section sheath 2 are discharged through the air drainage pipe 7.

Furthermore, by filling the hardening material 9, the hardening material 9 passes through the pipe 7 and fills the free length sheath 1, and the hardening material 9 blows out from the surface opening of the free length sheath 1. , it can be known that the fixing part sheath 2 is filled with the curing material 9.

(Effects of the Invention) Since the present invention has the above configuration, the following effects can be obtained.

<a> Since the tensile material and anchoring part sheath are integrated using the hardened material in the water stop part, the problem of the conventional construction method where the tension material and sheath become misaligned during insertion of the anchor into the drilled hole has been solved.

<b> By employing a polyethylene source as the free length sheath and a #l deformed sheath as the anchoring section sheath, the sheath can be used as appropriate for anchoring the anchor and introducing prestress force.

<c> Grout can be injected efficiently by providing multiple air vents with pipes.

[Brief explanation of drawings]

Figures 1 and 2: A sectional view of an embodiment of the anchor according to the present invention, Figure 3: A sectional view taken along line A-A in Figure 2, Figure 4: Overall view of the anchor, and Figure 5: Conventional Example cross-sectional view. 1...Free length part sheath, 2...Fixing part sheath, 3...
・Drilling, 4... Tensile material, 5... Unbonding source,
6...Filling pipe, 7.Air venting pipe, 8...Water stop material, 9...Hardening material.

Claims (3)

[Claims] (1) Place the free length sheath and the anchoring sheath continuously in the drilled hole, mark the tensile material inserted into the unbond source inside the free length sheath, and expose the tensile material inside the anchoring sheath. , the joint between the free length sheath and the anchoring sheath is filled with water stop material to fix and integrate the tensile material and the anchoring sheath, and the filling pipe inserted into the borehole from the ground surface reaches near the innermost part of the anchoring sheath. The air vent pipe is an anchor that penetrates the water stop material and communicates the free length sheath with the inside of the fixing part sheath. (2) The anchor according to claim (1), wherein a plurality of air vent pipes are provided. (3) The anchor according to claim (1), wherein a polyethylene source is used as the free length sheath, and a deformed steel sheath is used as the anchoring part sheath.