JP2847043B2 - Ground anchor method and its anchoring material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground anchor method and a fixing material therefor.

[0002]

2. Description of the Related Art Conventionally, a ground anchor method is shown in FIG.
There is something like that shown in In this method, the distal end portion of the PC steel wire 30 having a different length of the fixing length portion is embedded in the anchor body 40, and the rear end portion is tensioned by a predetermined tension and fixed by the fixing device 50.

[0003]

In the ground anchor method, when a predetermined tension is applied to the rear end of the PC steel wire 30 and the tension is applied, the anchor body 40 having the largest shear resistance due to the tension. There is a problem that cracks are generated and the pull-out resistance is reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent cracks from being generated in an anchor body and to prevent a pull-out resistance even if cracks are generated in an anchor body. An object of the present invention is to provide a ground anchor method and a fixing material for the ground anchor, which do not reduce the water content.

[0005]

Ground Anchorages claim 1 in the present invention to solve the above object, according to an aspect of
Is a resin coating that cures together with the grout on the fixing length
An inner layer is formed.
The PC steel wire on which the covered middle layer cylinder and the covered outer layer cylinder are formed
A plurality of steel tubes are inserted into a steel pipe filled with
Grounding holes formed with different burial positions
Anchoring material into the anchor hole and fill with grout.
From the opening of the anchor hole after the grout has hardened.
The rear end of the PC steel wire led out was tensioned and settled.
It is characterized by the following. Also, the ground anchor of claim 2
-The method uses a resin coating layer with a long curing time
Insert the formed PC steel wire into the grout-filled steel pipe.
To cure the resin coating layer and grout almost simultaneously.
Insert the ground anchor material into the anchor hole.
To fill the grout, and after curing the grout,
Rear end of PC steel wire led out from the opening of car hole
Is characterized by being nervous and established. Also ground
Anchor fixing material is integrated with grout in the fixing length part
A resin coating inner layer that cures is formed, and the free length portion is
In addition to the coating inner layer, a coating middle layer cylinder and a coating outer layer cylinder were formed.
Multiple PC steel wires inserted into grout-filled steel pipe
The buried position of the fixing length portion is formed differently
It is characterized by having done. Also for other ground anchors
The fixing material forms a resin coating layer with a long curing time on the fixing length.
Insert the formed PC steel wire into the grout-filled steel pipe.
To cure the resin coating layer and grout almost simultaneously.
It is characterized by having done.

[0006]

[Function] In the ground anchor method, the anchor length
Has a resin-coated inner layer that cures integrally with the grout.
In the free length portion, in addition to the coating inner layer, a coating middle layer cylinder and
PC steel wire with coated outer layer cylinder is filled with grout
Of the anchoring length part is inserted into the
Ground anchors with different locations
The grout is inserted into the anchor hole and the grout is filled.
After the route is cured, it is led out through the opening of the anchor hole.
Tension of the rear end of PC steel wire
Precisely install the PC steel wire at the design position of the anchor hole
be able to.

Further, since the grout in the steel pipe is restrained by the steel pipe, the pull-out resistance of the PC steel wire does not decrease.

Further, since the steel pipe is attached to the tip of the PC steel wire, the pull-out resistance with the anchor body is increased.

Further, in the ground anchor fixing material, since the steel pipe is filled with grout and a part of the PC steel wire is buried in the grout, the grout is restrained by the steel pipe and the proof stress is increased. No cracks occur.

In the ground anchor fixing material, a grout is filled in a steel pipe, a part of a PC steel wire is buried in the grout, and a resin which is hardened integrally with the grout in a fixing length portion of the PC steel wire. Due to the formation of the coating layer, P
The adhesive force between the C steel wire and the grout increases.

[0011] A plurality of the PC steel wires are inserted, and the anchoring portions are buried at different positions to form a tension-dispersed anchor, whereby the shear resistance with the ground generated in the anchor body can be averaged.

The steel pipe is a thin-walled steel pipe, and is provided with inner and outer concave and convex portions on its peripheral surface, so that pull-out resistance between the grout and the steel pipe and pull-out resistance between the steel pipe and the anchor body in the anchor hole are reduced. Increase.

Further, since the steel pipe has a closed front end and a protective tube attached to the rear end, it is possible to prevent water from flowing from the front end and the rear end of the steel pipe, and to protect the rear end of the steel pipe by the protective pipe. Prevents the edges from breaking.

The fixing length is hardened integrally with the grout.
A resin coating inner layer is formed, and the coating inner layer is formed on a free length portion.
In addition, a PC steel wire with a coated middle-layer cylinder and a coated outer-layer cylinder
Are inserted into the grout-filled steel pipe,
The grounding position is different for each
The formation of anchoring material for the
Cracking does not occur in the grout in the steel pipe.
No.

[0015] A resin coating layer having a long curing time is provided in the fixing length portion.
Insert the formed PC steel wire into grout-filled steel pipe
And harden the resin coating layer and grout almost simultaneously
By forming the ground anchor fixing material,
Steel wire is integrated with grout in steel pipe to increase anchoring power
You.

Further, the PC steel wire is a PC steel stranded wire in which a plurality of side wires are twisted around a core wire, and a synthetic resin-based coating inner layer is formed around the core wire and the side wire, and the outer circumference of the coating inner layer is formed. The coating middle-layer cylinder and the coating outer-layer cylinder are formed on each other, and the lubricant is interposed between the coating middle-layer cylinder and the coating outer-layer cylinder. By doing so, the exfoliation work of the leading end portion becomes easy, and the fixing length portion can be easily formed.

Further, the PC steel wire has a fixed length portion formed by exfoliating the coated middle layer tube and the coated outer layer tube at the tip portion, and the fixed length portion is substantially completely rust-proofed by the coating inner layer. The quality can be improved without generating rust on the PC steel stranded wire, and the adhesion to the grout can be improved.

In addition, since the PC steel wire is provided with a pressure grip at the tip of the fixing length portion, the pulling force with respect to the grout can be increased.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the ground anchor method of the present invention, FIG. 2 is a cross-sectional view of a ground anchor fixing material, FIG. 3 (1) is a front view of a PC steel wire, and (2) is (1).
(3) is a sectional view taken along the line BB, (4)
FIG. 3 is a sectional view taken along the line CC.

In the ground anchor method, a ground anchoring material (hereinafter referred to as "fixing material") 3 having a steel pipe 2 provided at the end of a PC steel wire 1 is inserted into an anchor hole 4, and a grout 17 is inserted into the anchor hole 4. Is filled and hardened, and then the rear end of the PC steel wire 1 led out from the opening 4a of the anchor hole 4 is tensioned by a predetermined tension and fixed by the fixing device 6.

The fixing material 3 is formed by embedding three PC steel wires 1 in a grout 5 in a thin steel pipe 2 with their fixing length portions 7 shifted. A protective pipe 8 is screwed to the upper end of the steel pipe 2 to enhance the waterproof effect.

The fixing material 3 is manufactured at a factory or a site. After inserting a PC steel wire 1 into a steel pipe 2 and installing it at a predetermined location, grout 5 is filled through an opening 2a of the steel pipe 2. Manufacturing. In addition, grout 5 on steel pipe 2
After filling, the grout 5 can be manufactured by inserting the PC steel wire 1 into the grout 5.

As shown in FIG. 3, the PC steel wire 1 is formed into a PC steel stranded wire in which a plurality of side wires 10 are wrapped around a core wire 9 by a synthetic resin extrusion molding means to form a coated middle layer cylinder 11 made of synthetic resin. And a coating outer layer cylinder 12 are provided. A lubricating material 13 such as grease is provided between the coating middle layer cylinder 11 and the coating outer layer cylinder 12.
And a coating inner layer 14 formed by melting and adhering a synthetic resin powder coating is formed on each outer periphery of the core wire 9 and the side wire 10.

At the end of the PC steel wire 1, a fixed length portion 7 is formed in which the coating middle layer 11, the coating outer layer 12 and the sliding material 13 are peeled off and the coating inner layer 14 is exposed.

As described above, the core wire 9 and the side wire 10 correspond to the inner coating layer 1.
Since the rust-prevention treatment is performed in step 4, no rust is generated on the strand of PC steel, and the adhesive strength with the grout is higher than that of the bare strand of PC steel.

The grout 5 is made of an epoxy resin,
A resin grout mixed with a thermosetting synthetic resin such as a vinyl ester resin or a polyester resin is used, and since the grout is constrained by a steel pipe as described above, the strength increases. Therefore, it is possible to prevent a crack from being generated in a portion where the shear resistance is greatest due to the tension of the PC steel wire 1.

FIG. 4A shows a steel pipe 2 provided with inner and outer concave and convex portions 16 on its peripheral surface.
Resistance between the steel pipe 2 and the steel pipe 2 and between the steel pipe 2 and the anchor body 15 in the anchor hole 4 can be increased.

FIG. 4 (2) shows the fixing material 3 provided with a crimping grip 18 at the tip of the fixing length portion 7 of the PC steel wire 1, and the pulling force with the grout 5 can be increased.

FIG. 5 shows a ground anchoring method using a fixing material 3 having a long curing time and a resin coating layer 19 formed of an epoxy resin on a fixing length portion 7 of a PC steel wire 1.

This is because the fixing length portion 7 has a long curing time,
By embedding the PC steel wire 1 having the resin coating layer 19 formed of epoxy resin in the cement grout 5a, the resin coating layer 19 hardens almost simultaneously with the hardening of the grout 5, so that the PC steel wire 1 becomes grouted. 5 and the fixing power increases.

The fixing material 3 is manufactured in a factory or on site by the same method as the fixing material 3 described above.

The resin coating layer 19 is formed on the outer periphery of the core wire 9 of the fixed length portion 7 and the outer periphery of each side wire 10 of the PC steel wire 1, and the free length portion 20 is formed in the same manner as described above.
1 and a coated outer cylinder 12 are provided.
A lubricating material 13 such as grease is interposed between 1 and the coated outer layer cylinder 12.

Further, the steel pipe 2 in the fixing material 3 can have an uneven portion 16 on the outer periphery as shown in FIG. 4A, and the PC steel wire 1 can be formed as shown in FIG. Alternatively, a fixing grip 18 may be provided at the tip.

[0034]

[Effect of the Invention] In the ground anchor method, it is established
The resin coating inner layer that cures integrally with the grout is formed on the long part
In the free length portion, in addition to the coating inner layer, a coating middle layer cylinder
The grout is filled with PC steel wire on which the coated outer layer cylinder is formed.
A plurality of steel pipes are inserted into the filled steel pipe, and
For ground anchors formed at different locations
Insert the fixing material into the anchor hole and fill with grout.
After the grout is cured, it is guided to the outside through the anchor hole opening.
Since the rear end portion of the PC steel wire that has been drawn out is firmly fixed , the PC steel wire can be accurately installed at the design position of the anchor hole.

Since the grout in the steel pipe is restrained by the steel pipe, the pull-out resistance of the PC steel wire does not decrease.

Since the steel pipe is attached to the tip of the PC steel wire, the pull-out resistance with the anchor body increases.

In the ground anchor fixing material, since the steel pipe is filled with grout and a part of the PC steel wire is buried in the grout, the grout is restrained by the steel pipe and the proof stress is increased. Does not occur.

The ground anchor fixing material is a resin coating layer in which a grout is filled in a steel pipe, a part of a PC steel wire is buried in the grout, and a fixing length portion of the PC steel wire is cured integrally with the grout. Is formed, the fixing force between the PC steel wire and the grout increases.

A plurality of PC steel wires are inserted and the anchoring length portions are buried at different positions to form a tension-dispersed anchor, and the shear resistance with the ground generated in the anchor body can be averaged.

The above-mentioned steel pipe is a thin-walled steel pipe. By providing inner and outer concave and convex portions on the peripheral surface, the pull-out resistance between the grout and the steel pipe and the pull-out resistance between the steel pipe and the anchor body in the anchor hole are increased. be able to.

The front end of the steel pipe is closed, and the protection pipe is attached to the rear end to prevent water from flowing from the front and rear ends of the steel pipe. Prevents destruction.

The fixing length is hardened integrally with the grout.
A resin coating inner layer is formed, and the coating inner layer is formed on a free length portion.
In addition, a PC steel wire with a coated middle-layer cylinder and a coated outer-layer cylinder
Are inserted into the grout-filled steel pipe,
The grounding position is different for each
The formation of anchoring material for the
Cracking does not occur in the grout in the steel pipe.
No.

A resin coating layer having a long curing time is provided on the fixing length portion.
Insert the formed PC steel wire into grout-filled steel pipe
And harden the resin coating layer and grout almost simultaneously
By forming the ground anchor fixing material,
Steel wire is integrated with grout in steel pipe to increase anchoring power
You.

The PC steel wire is a PC steel stranded wire in which a plurality of side wires are twisted around a core wire, and a synthetic resin coating inner layer is formed on the outer circumference of the core wire and the side wire, and a coating middle layer is formed on the outer circumference of the coating inner layer. By forming a cylinder and a coated outer layer cylinder, and by having a lubricating material interposed between the coated middle layer cylinder and the coated outer layer cylinder, the coated middle layer cylinder is made of a material that does not weld to the inner coating layer and is easily peelable. Thus, the exfoliation work of the leading end portion becomes easy, and the fixing length portion can be easily formed.

The PC steel wire has a fixed length portion formed by exfoliating the coated middle layer tube and the coated outer layer tube at the tip end, and the fixed length portion is substantially completely rust-proofed by the coating inner layer.
The quality can be improved without generating rust on the steel stranded wire, and the adhesion to the grout can be improved.

The PC steel wire is provided with a crimping grip at the end of the fixing length portion, so that the pulling force with respect to the grout can be increased.

[Brief description of the drawings]

FIG. 1 is a sectional view of a ground anchor method.

FIG. 2A is a longitudinal sectional view of a fixing material, and FIG. 2B is a transverse sectional view of the same.

3 (1) is a front view of a PC steel wire, (2) is a sectional view taken along line AA of (1), (3) is a sectional view taken along line BB of (1), and (4) is a sectional view of CC of FIG. It is a line sectional view.

FIG. 4A is a longitudinal sectional view of a fixing material having irregularities on the outer periphery of a steel pipe, and FIG. 4B is a longitudinal sectional view of a fixing material in which a crimping grip is attached to a PC steel wire.

FIG. 5 is a sectional view of another ground anchor method.

FIG. 6 is a longitudinal sectional view of another fixing material.

7A is a front view of another PC steel wire, FIG. 7B is a sectional view taken along line DD of FIG. 7A, and FIG. 7C is a sectional view taken along line EE of FIG.

FIG. 8 is a sectional view of a conventional ground anchor method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 PC steel wire 2 Steel pipe 3 Fixing material 4 Anchor hole 5, 5 a, 17 Grout 6 Fixing tool 7 Fixing length portion 8 Protective tube 9 Core wire 10 Side wire 11 Coating middle layer cylinder 12 Coating outer layer cylinder 13 Lubricant 14 Coating inner layer 15 Fixing length section 16 Uneven portion 17 Anchor body 18 Crimping grip 19 Resin coating layer

Claims (8)

(57) [Claims] (1) The fixing length portion is hardened integrally with grout.
An inner layer of resin coating is formed,
PC steel on which a coated middle layer cylinder and a coated outer layer cylinder are formed in addition to the layers
Multiple wires are inserted into the grout-filled steel pipe,
Groups formed with different embedding positions of the fixing length part
Insert the anchor for round anchor into the anchor hole
After filling the grout and curing the grout,
Tighten the rear end of the PC steel wire led out from the opening
Ground anchor method characterized by being established. 2. A resin coating layer having a long curing time in a fixing portion.
Insert the PC steel wire formed into the grout-filled steel pipe
And cure the resin coating layer and grout almost simultaneously.
The ground anchor material formed in
Into the grout and fill the grout, and after the grout hardens
After the PC steel wire led out from the opening of the anchor hole
The ground is characterized by being settled by tensioning the edges
Anchor method. 3. A plurality of said PC steel wires are inserted into a steel pipe.
That the burial position of the fixing length part was different
The ground anchor method according to claim 2, wherein: 4. The fixing length is hardened integrally with the grout.
An inner layer of resin coating is formed,
PC steel on which a coated middle layer cylinder and a coated outer layer cylinder are formed in addition to the layers
Multiple wires are inserted into the grout-filled steel pipe,
The fixing position of the fixing length is different
And a fixing material for ground anchors. 5. A resin coating layer having a long curing time in a fixing length portion.
Insert the PC steel wire formed into the grout-filled steel pipe
And cure the resin coating layer and grout almost simultaneously.
Anchoring for ground anchors characterized by forming
Wood. 6. A plurality of said PC steel wires are inserted into a steel pipe.
That the burial position of the fixing length part was different
A ground anchor anchor according to claim 5, characterized in that:
Wood. 7. The PC steel wire is pressurized at a tip end of a fixing length portion.
Wearing grip is provided The method according to claim 4, wherein
7. The fixing material for a ground anchor according to 5 or 6. 8. The steel pipe has a front end closed and a rear end closed.
A protective tube is attached, and inner and outer irregularities are formed on the peripheral surface.
8. The device according to claim 4, 5, 6, or 7, wherein
Fixing material for round anchor.