JPH10231522A - Slope stabilizing construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method in which even an anchor member comprising chemical fibers such as carbon fibers can be fixed, and in which use of steel members is reduced to improve appearance of a block. SOLUTION: A folded part of an anchor member 1 folded and fixed in the ground is disposed in an anchor hole 6 through a precast block 5 such as a slope stabilizing block to be hooked on a catching member 7. As material of the anchor member 1, PC steel twisted wires or chemical fibers are usable. A tension rod 9 threaded into the catching member 7 is tightened to tighten the anchor member 1. Hardening material 15 is injected into the anchor hole 6 to be hardened for fixing the folded part of the anchor member 1. In this case, the anchor member 1 is folded and fixed by the hardening material 15, so even chemical fibers can be fixed. By embedding a tip of the anchor member 1 in the hardening material 15, and removing the steel member 9, favorable appearance can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stabilizing a slope by installing a precast block on the ground.

[0002]

2. Description of the Related Art An anchor head for fixing an anchor which is inserted and fixed in a hole formed in a ground to a precast block on the ground is formed by gripping an end of an anchor material of the anchor with a wedge. Means for fixing to a steel fixture are employed. In addition, as anchor tension members, steel anchor materials such as PC steel strands and PC steel wires are generally used.

[0003]

In the case of such conventional anchors, steel members are often used, and the anchor material itself is generally made of steel. The biggest problem with steel parts is that they rust. In particular, the anchor material buried in the ground may be rusted and broken by the moisture leaching from the surrounding ground, and various measures such as the use of sheaths and rust-preventive oil have been taken as countermeasures. Was. Also, the rust prevention treatment of the anchor head was not reliable for preventing rust.

[0004] As a material of the anchor material that does not rust, it has been considered to use chemical fibers such as carbon fiber, aramid fiber and polyester fiber instead of steel wire. However, these chemical fibers are broken when they are gripped by wedges, and the fixation by wedges cannot be directly employed. In addition, the use of other steel members is another reason for increasing the construction cost, and measures must be taken to prevent rusting of those members. Further, the head portion for fixing the wedge protrudes from the surface of the precast block, which impairs the entire scene.

[0005]

In the slope stabilization method according to the present invention, the anchor material is folded back and the folded portion is hung on a hook member, so that an anchor material made of chemical fiber can be used without using wedges. By fixing the anchor material by the adhesive force of the material, it is possible to refrain from using other steel members.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a feature in an anchor for fixing a precast block on a slope, and is applied to a precast concrete block for stabilizing a slope. An anchor material folded into two is inserted into the hole formed in the ground, and the folded portion is projected to the surface of the ground. As a material for the anchor material, a carbon fiber, an aramid fiber, a polyester fiber, or another chemical fiber can be used in addition to a PC steel wire or a PC steel stranded wire. The chemical fibers can be used as they are bundled as they are, or those hardened into a rod shape. These anchor materials are inserted into the hole, and grout is injected into the hole and fixed. The precast block is formed with a penetrating anchor hole, in which the folded portion of the anchor material is located. It is preferable that the anchor hole is formed in a tapered surface in which the diameter decreases as the inner circumference becomes deeper, or is formed in an uneven shape.

The folded portion of the anchor material in the anchor hole is hung on the hook member, a tension rod is screwed into the hook member, and the tension bar is tensioned. The tension rod is temporarily fixed to the support plate with a nut or wedge under tension. In this state, cement milk, mortar,
A hardening material such as resin mortar is injected and hardened. The anchor material adheres to the hardening material and is fixed. Because the inner circumference of the anchor hole is formed in a tapered surface or unevenness,
A wedge effect and a friction effect are generated in the hardened material hardened in the anchor hole, and the hardened material does not fall off from the precast block. The nut and the supporting plate may be left as they are, but it is preferable that the nut and the supporting plate are rotated and removed, and the hardening material is buried in the hole from which the tension rod has come out to form the block surface flat.
Since the maintenance and management of the head treatment of the slope stable structure thereafter becomes remarkably easy, it is optimal as a method of treating the structure on a steep slope.

The anchor material does not always need to be tensioned, and the hardening material may be injected with the tension rod fixed with a nut or the like so as not to be displaced. In addition to the insertion of the anchor material into the borehole, the anchor material may be disposed underground by embankment or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings. 1 to 3, reference numeral 1 denotes an anchor material made of carbon fiber, which is bundled as it is and folded twice. An unbonded sheath 2 is placed at a predetermined interval from the folded portion of the folded anchor material 1 to avoid adhesion to the grout material 4. After that, it is bound at a plurality of places with spacers 12 therebetween at appropriate intervals, and a device for increasing the area of adhesion to the grout material 4 is made. The anchor material 1 is inserted into a drilled hole 3 excavated in the ground, into which a grout material 4 such as cement milk is injected and fixed. The above-mentioned folded portion of the anchor material 1 is exposed on the ground, and is located in the anchor hole 6 of the precast block 5. In the embodiment, a slope stabilizing block is used as the precast block 5, and the inner peripheral surface of the anchor hole 6 penetrating the precast block 5 is formed as a tapered surface so that the diameter decreases toward the depth, that is, toward the ground. I have. On the inner peripheral surface of the anchor hole 6, a trumpet-shaped sheath 17 made of steel and having a reduced diameter at one end is disposed.

Reference numeral 7 denotes a hook member made of a casting.
A screw hole 8 is formed in the middle between the left and right. Reference numeral 9 denotes a drawbar, which is provided with a male screw around the hook, and
Are screwed into the screw holes 8 and connected. The anchor member 1 is divided into two parts and is hung on the left and right sides of the hook member 7. Reference numeral 10 denotes a steel supporting plate, and a central hole 11
A nut 13 is screwed into the tension rod 9 through which the nut 13 passes. In this state, the tension bar 9 is clamped and pulled by a cylinder (jack) to tension the anchor member 1. Anchor material 1
In a tensioned state, cement milk as a hardening material 15 is injected from the injection hole 14 of the support plate 10 to fill the anchor hole 6 and harden. The hardening material 15 adheres to the periphery of the exposed anchor material 1 and also enters the lower side of the hook member 7 and hardens. After hardening of hardening material 15, nut 1
3 and the supporting plate 10 are removed, and the pulling bar 9 is turned to remove it from the hardening material 15. The hardening material 15 is filled in the holes formed and the surface of the precast block 5 is leveled.

FIGS. 4 and 5 show an example in which a retaining wall block is used as the precast block 5, and a material obtained by processing carbon fiber is used as the anchor material 1, but an unbonded sheath is used. Instead, the attachment area of the anchor material 1 that has been folded back through the spacer 12 over the entire length is increased. The anchor material 1 is stretched so as to be laid on the embankment 16, and the hardening material 15 is cast on the anchor material 1 and fixed. This anchor material 1
Is located in the anchor hole 6 of the upright precast block 5. The tension member 9 is screwed by hooking the anchor member 1 on the hook member 7, the tension member 9 is fixed to a predetermined height by the support plate 10 and the nut 13, and the hardening material 5 is injected into the anchor hole 6 and hardened. . The embankment 16 is further laid on the anchor material 1, and the above operation is repeated.

FIG. 6 shows another embodiment of the precast block 5 in which an irregular sheath 18 made of steel is arranged on the inner periphery of the anchor hole 6 so that the inner peripheral surface is made uneven and hardened. The hardening material 15 may be prevented from falling off due to a friction effect with the material 15. PC as anchor material 1
When using a steel material such as steel wire or PC stranded wire to apply a prestressing force to the anchor by applying tension, cover the portion buried in the ground with the sheath of the free length portion of the anchor material. The inside can be filled with anti-rust grease.

[0013]

The present invention has the above-described configuration, and can obtain the following effects. Since the anchor material is folded back, hooked, adhered to the hardening material and fixed, even if a chemical fiber such as carbon fiber is used as a material for the anchor material, a stable slope stable structure can be constructed without cutting. By adopting chemical fiber as the material of the anchor material, it is not necessary to take measures to prevent rusting, and the anchor becomes highly reliable. Since the anchor material adheres to the hardened material in the anchor hole of the precast block with uniform quality, strength and high reliability, even if a large load is applied to the anchor head, the precast block surrounds the hardened material in the anchor hole Hold firmly from Therefore, the anchor head does not come off the block. By forming the inner peripheral surface of the anchor hole as a tapered surface or an uneven surface, a wedge effect and a friction effect are exhibited, and the hardening material in the anchor hole does not fall off the block. By removing the nut, the support plate, and the tension rod, there is no longer any protruding part from the block surface, the appearance of the block becomes good, and the construction cost can be reduced by using these members for general purposes. By removing the steel members, there is no need to take measures to prevent rust, and construction is facilitated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a precast block in which an anchor head of the present invention is implemented.

FIG. 2 is a perspective view of a member used for an anchor head.

FIG. 3 is a cross-sectional view in which the present invention is applied to a slope stable block.

FIG. 4 is a cross-sectional view of the present invention applied to a retaining wall block.

FIG. 5 is a sectional view of an embodiment in which anchors of retaining wall blocks are buried by embankment.

FIG. 6 is a sectional view of another embodiment of the anchor hole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anchor material 2 Unbonded sheath 3 Drilling hole 4 Grout material 5 Precast block 6 Anchor hole 7 Hook member 8 Screw hole 9 Tension rod 10 Support plate 11 Hole 12 Spacer 13 Nut 14 Injection hole 15 Hardening material 16 Embankment 17 Trumpet sheath 18 Irregular shape sheath

Claims (2)

[Claims] 1. An anchor material which is folded back and fixed in the ground in an anchor hole penetrating a precast block, and is hooked on a hook member. Nervous,
A slope stabilization method in which a hardening material is injected into an anchor hole and hardened, the folded portion of the anchor material is fixed in the anchor hole, and a precast block is installed on the slope. 2. An anchor hole penetrating a precast block, a folded portion of an anchor material folded back and fixed in the ground is disposed on a hook member, and a tension rod screwed into the hook member is fixed. A slope stabilization method in which a hardening material is injected into the hole and hardened, the folded portion of the anchor material is fixed in the anchor hole, and a precast block is installed on the slope.