JP2667378B2 - Ground anchor head anchoring structure - 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 head fixing structure.

[0002]

2. Description of the Related Art A conventional head anchoring structure of a ground anchor has a structure as shown in FIG. The sleeve tube 30 is inserted into the entrance of the anchor hole 20, the opening of the sleeve tube 30 is covered with a stiffening plate 40, and the back curing tube 50 welded to the stiffening plate 40 is penetrated. The PC steel material 60 is tension-fixed by the anchor head 70.

In this head fixing structure, the back curing tube 50 is formed of a non-bendable steel plate, and the upper end thereof is welded to the stiffening plate 40.

[0004]

However, it has been difficult to mount the stiffening plate at right angles to the tension fixing direction of the PC steel. For this reason, the PC steel material is eccentric in the rear curing pipe, and the water blocking cap is crushed in the eccentric direction, so that there is a problem that sufficient water stopping property cannot be secured.

[0005] Further, it is necessary that the PC steel material is tensioned and fixed linearly from the fixing portion toward the ground.
If the stiffening plate is not attached at a right angle to the PC steel or at a designed angle, the PC steel may be bent at the rear curing pipe part.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a method in which a PC steel material is attached to a rear curing pipe portion even if a stiffening plate is not attached at a right angle or a designed angle to a PC steel material. It is an object of the present invention to provide a ground anchor head fixing structure that can be tensioned and fixed without bending, and can exhibit sufficient water stopping performance even when the water stopping cap is pressed in the eccentric direction.

[0007]

According to the present invention, there is provided a ground anchor having a head anchoring structure in which a sleeve tube is attached to an entrance of an anchor hole, and a supplementary portion is provided at an opening of the sleeve tube. In a head anchoring structure of a ground anchor in which a rigid plate is covered, and a PC steel material penetrating through a rear curing tube attached to a through hole of the stiffening plate is tensioned and fixed by an anchor head, the rear curing tube is a flexible tube. A water stop cap is provided on the inner side of the lower part thereof, and a water stop packing is provided on the water stop cap, wherein the water stop cap is slightly larger than the inner diameter of the rear curing pipe, and Is formed of a thin steel plate, has a smaller diameter than the through-hole of the stiffening plate, and is attached with an appropriate interval between the edge of the through-hole. It is to configure, characterized in that formed in the appropriate thickness using a synthetic rubber or swellable rubber.

[0008]

[Function] Even if the stiffening plate is not mounted at a right angle or a designed angle to the tension setting direction of the PC steel material, the rear curing pipe bends in the tension fixing direction of the PC steel material to fix the PC steel material. The tension can be fixed linearly from the part toward the ground.

Further, the waterproof packing provided on the waterproof cap prevents the urethane resin solution filled in the rear curing tube as a waterproof material from leaking.

[0010] Further, since the rear curing pipe is formed of a thin steel plate, it is possible to follow the PC steel material in the tension fixing direction.

The rear curing tube has a smaller diameter than the through hole of the stiffening plate, and can be freely bent in an arbitrary direction by being attached at an appropriate distance from the edge of the through hole. .

Further, since the water-stop cap is made of water-resistant synthetic rubber to have an appropriate thickness, it does not shrink due to the eccentricity of the PC steel material, but also has a sufficient rear surface in combination with the deflection of the rear curing tube caused by the eccentricity. Demonstrate excellent waterproofing.

Further, since the water-stop cap of the swellable rubber is swollen by water, it is possible to completely prevent water from infiltrating into the rear curing tube in combination with the water-stop packing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the head anchoring structure of a ground anchor according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a ground anchor head anchoring structure of the present invention, FIG. 2 is a cross-sectional view of a ground anchor head anchoring structure in which a stiffening plate is not mounted at right angles to a tension anchoring direction of PC steel, FIG. 3 is a cross-sectional view of the rear curing tube.

In the head anchoring structure of the ground anchor according to the present invention, a sleeve tube 2 for suppressing collapse of the hole wall is inserted into the inner surface of the anchor hole 1, and a stiffening plate 3 is fitted in an opening 2 a of the sleeve tube 2. The PC steel member 5 attached and inserted into the rear curing pipe 4 attached to the stiffening plate 3 is tensioned and fixed by an anchor head 6. The PC steel material 5
Uses a PC steel strand, a PC steel wire and a PC steel rod.

The rear curing tube 4 has an upper large-diameter portion 4a and a small-diameter cylindrical portion 4b integrally formed of a thin stainless steel plate, and a flange portion 4c around the large-diameter portion 4a is fixed to the stiffening plate 3 by a support plate 7. A sheet packing 12 is provided around the flange 4c and is bolted.

Since the cylindrical portion 4b has a small diameter, a predetermined gap 8 is formed between the cylindrical portion 4b and the edge of the through hole 3a of the stiffening plate 3.
Is formed, and the rear curing pipe 4 is freely bent in the gap 8.

This is because the rear curing pipe 4 is formed of a thin stainless steel plate as described above, and the cylindrical body 4b has a small diameter. This is because it is bent at the boundary 4d.

The rear curing pipe 4 is filled with a water-stop material 11 such as grease or urethane resin, and a water-stop cap 9 and a water-stop packing 10 made of synthetic rubber are fitted into a lower portion thereof. The water-stop packing 10 prevents leakage of the urethane solution filled in the rear curing pipe 4 as the water-stopping material 11, and is formed slightly larger than the inner diameter of the rear curing pipe 4, so that the outer edge portion and the insertion hole are formed. The edges are fitted into the inner surface of the rear curing pipe 4 and the outer surface of the PC steel wire in a state of being bonded in a watertight manner.

As shown in FIG. 2, the water blocking cap 9 has a thickness to deflect the rear curing pipe 4 in the eccentric direction of the PC steel material 5, and even if the rear curing pipe 4 bends in a predetermined direction. It exerts sufficient waterproof performance without shrinking.

As described above, the rear curing pipe 4 is bent while the water blocking cap 9 ensures water blocking, so that the PC steel material 5 can be tensioned and fixed without being bent.

Therefore, the waterproof cap 9, the waterproof packing 10, and the waterproof material 11 such as urethane resin form a double
Since triple waterproofing can be applied, water intrusion from underground and above ground can be completely prevented.

When the water-stop cap 9 is made of swellable rubber, it swells with groundwater or the like, so that it is possible to prevent water from entering the rear curing pipe 4.

FIGS. 4 and 5 show another embodiment of the water stop cap 9. FIG. 4 shows a water stop fin 13 a provided on the inner wall of the hole 13 into which the PC steel material 5 is inserted. .
In FIG. 5, the diameter of the hole 13 is gradually reduced, and the upper end portion is formed to have substantially the same diameter as or slightly smaller than the PC steel material 5.

The back curing tube 4 is not limited to stainless steel, but may be made of synthetic rubber.

[0026]

Even if the stiffening plate is not mounted at a right angle or at a designed angle with respect to the tension fixing direction of the PC steel,
By bending the rear curing pipe in the tension fixing direction of the PC steel material, the PC steel material can be linearly tensioned and fixed from the fixing part toward the ground.

A waterproof packing provided on the waterproof cap prevents the urethane resin solution filled in the rear curing tube as a waterproof material from leaking.

Since the back curing tube is formed of a thin steel plate, it is possible to follow the PC steel material in the direction of tension fixing.

The rear curing tube has a smaller diameter than the through hole of the stiffening plate, and can be freely bent in an arbitrary direction by being attached at an appropriate distance from the edge of the through hole.

The water-stop cap is made of water-resistant synthetic rubber to have an appropriate thickness, so that it does not shrink due to the eccentricity of the PC steel material, and also has a sufficient rear stop due to the deflection of the rear curing pipe caused by the eccentricity. Exhibits water-based properties.

When the water-stopping cap of the swellable rubber is swollen by water, it is possible to completely prevent water from infiltrating into the rear curing tube in combination with the water-stopping packing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a head anchoring structure of a ground anchor.

FIG. 2 is a cross-sectional view of a head anchoring structure of a ground anchor in a state where a back curing tube is bent.

FIG. 3 is a sectional view of a rear curing tube.

FIG. 4 is a cross-sectional view of another back curing tube.

FIG. 5 is a cross-sectional view of another back curing tube.

FIG. 6 is a sectional view of a conventional head anchoring structure of a ground anchor.

[Explanation of symbols]

 1 Anchor Hole 2 Sleeve Tube 2a Opening 3 Stiffening Plate 3a Through Hole 4 Back Curing Pipe 5 PC Steel 6 Anchor Head 7 Bearing Plate 8 Gap 9 Water Stop Cap 10 Water Stop Packing 11 Water Stop

Claims (5)

(57) [Claims] 1. A sleeve tube is attached to an entrance of an anchor hole, and an opening of the sleeve tube is covered with a stiffening plate.
In the head anchoring structure of the ground anchor, in which the PC steel material penetrating through the rear curing pipe attached to the through hole of the stiffening plate is tensioned and fixed by the anchor head, the rear curing pipe is a flexible pipe, and A head anchor structure for a ground anchor, comprising a water stop cap and a water stop packing provided on the water stop cap. 2. The head anchoring structure for a ground anchor according to claim 1, wherein the waterproof packing is slightly larger than the inner diameter of the rear curing pipe. 3. The head anchoring structure for a ground anchor according to claim 1, wherein the back curing tube is formed of a thin steel plate. 4. The back curing tube has a smaller diameter than the through hole of the stiffening plate, and is attached at an appropriate distance from an edge of the through hole.
2. The head anchoring structure of the ground anchor according to 1. 5. The head anchoring structure for a ground anchor according to claim 1, wherein the water blocking cap is formed of synthetic rubber or swellable rubber to an appropriate thickness.