JPH0868049A - Structure for fixing head in ground anchor - Google Patents

Abstract

PURPOSE: To anchor a tension material from an anchorage point into the ground while the material is being stretched in a straight line even if a curing pipe is not set perpendicular to an anchor hole or is not provided at a designed angle. CONSTITUTION: In a structure for fixing a head in a ground anchor, a reinforcing pipe 2 is inserted and fitted in the inner surface of an anchor hole 1 to prevent collapse of the wall of the hole and a reinforcing plate 3 is attached to an opening 2a at the upper end of the pipe 2. A PC steel wire 5 is inserted into a curing pipe 4 attached to the plate 3 and the end of the wire 5 is anchored to an anchor head 7 at an anchor plate 6 on the plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head anchoring structure for a ground anchor.

[0002]

2. Description of the Related Art Conventionally, a head anchoring structure of a ground anchor has a structure as shown in FIG.

In this case, a reinforcing pipe 30 is inserted into the entrance of the anchor hole 20, an upper end opening of the reinforcing pipe 30 is covered with a stiffening plate 40, and the curing pipe 5 welded to the stiffening plate 40.
The PC steel wire 60 is inserted into the 0, the end of the PC steel wire 60 is fixed by the anchor head 80 in the anchor plate 70 on the stiffening plate 40, and the anchor head 80 is covered with the head cap 80a. Antirust oil 80b
And the head cap 80a is further covered with an outer cap 90.

In this fixing structure, the curing pipe 50 is made of steel, and its upper end portion is inserted into the hole of the stiffening plate 40 and welded.

[0005]

However, in the fixing structure as described above, if the steel curing pipe is not attached at a right angle to the anchor hole or at a designed angle, the PC is not installed.
Since the steel wire is inserted into the curing pipe in an eccentric state, there is a problem that the fitting of the rubber cap in the curing pipe is displaced and the rust preventive material filled in the curing pipe leaks.

Further, it is necessary that the tension member is tensioned and fixed linearly from the fixing portion to the ground, but the curing tube is attached at a right angle to the anchor hole or at a designed angle. Otherwise, the rubber cap inside the curing tube may bend.

The present invention has been made in view of the above problems, and an object thereof is to provide a tension member from a fixing portion even if the curing tube is not attached at a right angle to the anchor hole or at a designed angle. It is an object of the present invention to provide a head anchoring structure in a ground anchor that can be anchored linearly toward the ground.

[0008]

In order to achieve the above object, the head anchoring structure of the ground anchor of the present invention is such that a reinforcing pipe is inserted into the entrance of the anchor hole, and the upper end opening of the reinforcing pipe is inserted. A stiffening plate is covered with the stiffening plate, a PC steel wire is inserted into a curing pipe attached to the stiffening plate, and an end of the PC steel wire is fixed by an anchor head of the anchor plate on the stiffening plate. In the fixing structure of, a flange portion that engages with the hole edge of the mounting hole of the stiffening plate is provided on the peripheral edge of the upper end portion, and the engagement surface between the mounting hole and the flange portion is a follow-up structure, The curing pipe is made of an elastic material or a synthetic resin material, and the curing pipe is a bellows pipe, and a Teflon sheet is attached to the lower surface of the collar portion or the upper surface of the hole edge, and the follow-up structure is inclined outward. It is an inclined surface and An inclined surface inclined outwardly following structures upward, consists of a vertical surface, it is to configure, wherein the tracking structure is a curved surface curved outwardly upward.

[0009]

Thus, the brim portion which engages with the hole edge of the mounting hole of the stiffening plate is provided on the peripheral edge of the upper end portion of the curing tube, and the engaging surface between the mounting hole and the brim portion has a follow-up structure. Thus, the attachment portion between the stiffening plate and the curing tube can be sealed.

Further, since the curing tube of the stiffening plate is made of a synthetic resin material, an elastic material, or a bellows tube, the curing tube can have flexibility, so that the stiffening plate is perpendicular to the anchor hole or Even if the PC steel wire is not attached at the designed angle, the PC steel wire can be tensioned and fixed linearly from the fixing portion to the ground, and the fitting deviation of the rubber cap in the curing pipe can be prevented.

Further, by attaching the Teflon sheet to the lower surface of the collar portion or the upper surface of the hole edge, the curing tube can be rotated with respect to the stiffening plate.

[0012]

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 sectional view of a head anchoring structure in a ground anchor of the present invention, and FIG. 2 is a sectional view of a curing tube attached to a stiffening plate.

In the anchoring structure of the head of the ground anchor of the present invention, a reinforcing tube 2 for suppressing collapse of the hole wall is inserted into the inner surface of the anchor hole 1, and the opening 2a at the upper end of the reinforcing tube 2 is stiffened. The plate 3 is attached, the PC steel wire 5 is inserted into the curing pipe 4 attached to the stiffening plate 3, and its end is fixed by the anchor head 7 in the anchor plate 6 on the stiffening plate 3. It is configured.

The curing tube 4 is a bellows tube made of a synthetic resin material such as polyethylene or polypropylene, or an elastic material such as synthetic rubber or natural rubber, and its upper portion is inserted into the mounting hole 8 of the stiffening plate 3. ing. Further, a flange portion 9 is projectingly provided on the peripheral edge of the upper end portion of the curing tube 4, and the flange portion 9 is engaged with the hole edge 8 a of the mounting hole 8.

The curing tube 4 may be a straight tube made of a synthetic resin material or an elastic material instead of the bellows tube.

The engaging surface of the collar portion 9 with the hole edge 8a is an inclined surface 9a which is inclined outward toward the upper side, and the Teflon sheet 10 is attached to the inclined surface 9a so that the curing tube 4 can be smoothly moved. It can be rotated. Also, this inclined surface 9a
Corresponding to the above, the inclined surface 9a is also formed on the hole edge side.

When the Teflon sheet 10 is not attached to the inclined surface 9a on the flange portion 9 side, the Teflon sheet 10 is attached to the inclined surface 9a on the hole edge 8a side. As described above, the collar portion 9 is engaged with the hole edge 8 a via the Teflon sheet 10.

A flange piece 11 is provided on the inner surface of the lower end of the curing tube 4, and a rubber cap 12 is engaged with the flange piece 11 to enclose the rust preventive material 13 in the curing tube 4.

FIG. 3 shows that the engaging surface of the flange portion 9 with the hole edge 8a is formed by the inclined surface 9a and the vertical surface 9b. As with the above, the Teflon sheet 10 is formed on the inclined surface 9a and the vertical surface 9b.
Is attached. A stepped engagement surface 9c corresponding to the inclined surface 9a and the vertical surface 9b is also formed on the hole edge 8a side.

As described above, the engaging surfaces are inclined surface 9a and vertical surface 9
By forming it from b and these, it is possible to bring them into close contact with each other, and by further adhering the Teflon sheet 10 to the inclined surface 9a and the vertical surface 9b, it is possible to rotate the curing tube 4 and enhance its adhesion. it can.

Also in FIG. 4, the engaging surface of the collar portion 9 with the hole edge 8a is a curved surface 9d which is curved outward toward the upper side, and the Teflon sheet 10 is attached to the curved surface 9d. There is. A curved surface 9d corresponding to the curved surface 9d is also formed on the hole edge 8a side.

As described above, the engaging surface is the curved surface 9d which is curved outward toward the upper side, and the Teflon sheet 10 is attached to the curved surface 9d, so that the curing tube 4 can be rotated more easily and easily. The adhesion can be increased.

[0023]

EFFECTS OF THE INVENTION By providing a brim portion that engages with the hole edge of the mounting hole of the stiffening plate on the peripheral edge of the upper end of the curing tube, and by making the engagement surface between the mounting hole and the brim portion follow-up structure, The attachment portion between the stiffening plate and the curing tube can be sealed.

Since the curing tube of the stiffening plate is made of a synthetic resin material, an elastic material or a bellows tube, the curing tube can have flexibility, so that the stiffening plate is perpendicular to the anchor hole or designed. Even if it is not installed at the specified angle, P
The C steel wire can be tensioned and fixed linearly from the fixing portion toward the ground, and the deviation of the fitting of the rubber cap in the curing pipe can be prevented.

By attaching the Teflon sheet to the lower surface of the collar portion or the upper surface of the hole edge, the curing tube can be rotated with respect to the stiffening plate.

Since the engaging surface with the hole edge of the collar portion is an inclined surface which is inclined outward toward the upper side, the attachment portion between the stiffening plate and the curing tube can be sealed.

Since the engaging surface with the hole edge of the flange is formed by the inclined surface which is inclined outward toward the upper side and the vertical surface, the mounting portion between the stiffening plate and the curing tube is hermetically sealed. You can

By making the engaging surface of the flange portion with the hole edge a curved surface that is curved outward toward the upper side, the attachment portion between the stiffening plate and the curing tube can be sealed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a head fixing structure in a ground anchor.

FIG. 2 is a cross-sectional view of a curing tube.

FIG. 3 is a cross-sectional view of another curing tube.

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

FIG. 5 is a cross-sectional view of a head fixing structure in a conventional ground anchor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anchor hole 2 Reinforcement pipe 2a Opening part 3 Stiffening plate 4 Curing pipe 5 PC steel wire 6 Anchor plate 7 Anchor head 8 Mounting hole 8a Hole edge 9 Collar part 9a Sloping surface 9b Vertical surface 9c Engaging surface 9d Curved surface 10 Teflon Sheet 11 Collar piece 12 Rubber cap 13 Rust preventive material

Claims (7)

[Claims] 1. A reinforcing pipe is inserted into an inlet of an anchor hole, a stiffening plate is coated on an upper end opening of the reinforcing pipe, and a PC steel wire is inserted into a curing pipe attached to the stiffening plate. In a fixing structure of a head portion of a ground anchor whose end portion is fixed by an anchor head of an anchor plate on the stiffening plate, a flange portion that engages with a hole edge of a mounting hole of the stiffening plate at a peripheral edge of an upper end portion thereof The fixing structure of the head of the ground anchor is characterized in that the engaging surface between the mounting hole and the flange is made to follow. 2. The head anchoring structure for a ground anchor according to claim 1, wherein the curing tube is made of an elastic material or a synthetic resin material. 3. The fixing structure for the head of the ground anchor according to claim 1, wherein the curing tube is a bellows tube. 4. The head anchoring structure for a ground anchor according to claim 1, wherein a Teflon sheet is attached to the lower surface of the flange or the upper surface of the hole edge. 5. The fixing structure for a head portion of a ground anchor according to claim 1, wherein the follow-up structure is an inclined surface that is inclined outward. 6. The head anchoring structure for a ground anchor according to claim 1, wherein the follow-up structure is composed of an inclined surface that is inclined upward and outward and a vertical surface. 7. The fixing structure for a head portion of a ground anchor according to claim 1, wherein the follow-up structure is a curved surface that is curved outward toward the upper side.