JPH0988075A - Ground anchor construction method and pressure receiving board thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to further reduce the weight of a pressure receiving board in a ground anchor construction method used to reinforce the surface of a slope or the like. SOLUTION: The tip of a tension member is anchored with an anchor fixing body 11 in a ground while the rear end derived from an anchor hole 10 is penetrated through a through hole 16 of a pressure receiving board 1 which comprises an upper board 2 and a lower board 3, which are made of FRP and anchored with a fixture 14. Then, a cast-in-place concrete is placed in a void area 7 for concrete placement comprising the upper board 2 and the lower board 3 and around the peripheral areas.

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 pressure receiving plate therefor.

[0002]

2. Description of the Related Art In the slope stabilization method using a ground anchor, many methods are used in which the reaction force of the anchor 21 is applied via a pressure receiving plate 20 as shown in FIG.

By adopting the reverse winding method in this construction method, there is an advantage that the construction of the slope earth works becomes safe and the construction period can be greatly shortened. The pressure receiving plate 20 used in this construction has a weight of 1 to 5 tons, and is a weight that enables a sufficiently quick work within the working radius of the truck crane.

[0004]

However, when working on a steep slope or a long slope, the truck crane becomes extremely large and the working radius is exceeded, and further, the truck crane cannot penetrate or be installed. This made it difficult to install the pressure plate.

The present invention has been made in view of the above problems, and an object thereof is to reduce the weight of a pressure receiving plate in a ground anchor construction method used for slope reinforcement and the like.

[0006]

[Means for Solving the Problems] As means for solving the above problems, the ground anchor method fixes the tip of the tensile member to the anchor fixing body in the ground, and leads out from the opening of the anchor hole. After the rear end portion is inserted into the through hole of the pressure receiving plate composed of the upper plate and the lower plate made of FRP and fixed by the fixing tool, the void part for concrete pouring consisting of the upper plate and the lower plate and its That is, concrete was placed around the area. In addition, the pressure plate for the ground anchor method is FR
The inner cylinder protruding from the P upper plate is fitted into the outer cylinder protruding from the FRP lower plate to form a through hole extending between the upper plate and the lower plate, and the upper plate and the lower plate are formed. That is, a gap for concrete pouring is formed by the plate, and the upper plate and the lower plate are removable.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a sectional view of a pressure receiving plate, FIG. 2 is a sectional view of a pressure receiving plate in which an upper plate and a lower plate are separated, FIG. 3 is a plan view of a lower plate, FIG. 4 is a plan view of an upper plate, and FIG. 5 is a ground anchor. It is a sectional view of a construction method.

The ground anchor method of the present invention is constructed by using the pressure receiving plate 1 shown in FIG. 1. The pressure receiving plate 1 is composed of an upper plate 2 made of FRP and a lower plate 3 made of FRP. ing.

An inner cylinder 4 protruding from the central portion of the upper plate 2
Is fitted into an outer cylinder 5 protruding from the central portion of the lower plate 3 to form a through hole 6 extending from the upper plate 2 to the lower plate 3, and the upper plate 2 and the lower plate 3 form a concrete pouring hole. A space 7 for installation is formed.

Since both the upper plate 2 and the lower plate 3 are made of FRP, they are very lightweight and can be easily separated. Therefore, in addition to forming this pressure receiving plate 1 at the factory,
Easy to assemble on site. The pressure receiving plate 1 may be formed not only by assembling the upper plate 2 and the lower plate 3 by assembling but also by integrally forming them from the beginning.

Next, a ground anchor construction method using the pressure receiving plate 1 will be described. 5 and 6 are cross-sectional views in which this ground anchor method is used for slope reinforcement. First, anchor holes 10 are drilled in the ground 9 of the slope 8 at appropriate intervals.

Then, these anchor holes 10 are filled with grout to form anchor fixing members 11, and the front end portions of the tension members 12 such as PC steel wires are inserted into the anchor fixing members 11 and the rear end portions thereof are It is led out from the opening 13 of the anchor hole 10.

Next, when the anchor fixing member 11 is hardened, the pressure receiving plate 1 is installed in each anchor hole 10 and the tension member 12 is provided.
By inserting the rear end portion into the through hole 6 and temporarily fixing it with the fixing tool 14, the slope 8 becomes stable.

In the pressure receiving plate 1, the inner cylinder 4 of the upper plate 2 is connected to the lower plate 3
It is fitted in the outer cylinder 5 of No. 1 and assembled on site. However, the pressure receiving plate 1 is not limited to the one assembled on site,
Alternatively, the upper plate 2 and the lower plate 3 may be integrated.

Next, each tension member 12 is tensioned to fix the fixing member 14.
After the main fixing is performed, concrete 15 is placed around the void portion 7 for concrete placing formed by the upper plate 2 and the lower plate 3 of the pressure receiving plate 1 and the periphery thereof to connect adjacent pressure receiving plates 1 to each other. To do.

As a result, a lattice-shaped concrete frame 16 as shown in FIG. 6 is formed and the slope 8 is protected. Since the pressure receiving plate 1 is made of FRP to reduce the weight in this way, the work of stabilizing the slope 8 can be easily performed.

FIG. 8 shows a pressure receiving plate 1 of another embodiment, in which an upper plate 2 and an inner cylinder 4, and a lower plate 3 and an outer cylinder 5 are separately formed. FIG. 9 shows a ground anchor construction method using the pressure receiving plate 1 of another embodiment, which is basically the same as the above ground anchor construction method.

[0018]

EFFECTS OF THE INVENTION The tip of the tension member is fixed to the anchor fixing member in the ground, and the rear end drawn out from the anchor hole is inserted into the through hole of the pressure receiving plate composed of the upper plate and the lower plate made of FRP. Then, after fixing with a fixing tool, the pressure receiving plate can be easily installed by placing the cast-in-place concrete in and around the void for concrete placing that consists of the upper plate and the lower plate. You can do various tasks.

The inner cylinder protruding from the FRP upper plate is the FR
It is fitted into an outer cylinder protruding from the P lower plate to form a through hole extending between the upper plate and the lower plate, and the upper plate and the lower plate form a void for concrete pouring. As a result, the weight of the pressure receiving plate can be reduced.

Since the upper plate and the lower plate are detachable, they can be easily assembled and formed on site.

[0021]

[Brief description of drawings]

FIG. 1 is a sectional view of a pressure receiving plate.

FIG. 2 is a sectional view of a pressure receiving plate in which an upper plate and a lower plate are separated.

FIG. 3 is a plan view of a lower plate.

FIG. 4 is a plan view of an upper plate.

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

FIG. 6 is a cross-sectional view in which the ground anchor construction method is used for slope reinforcement.

FIG. 7 is a front view of FIG. 6;

FIG. 8A is a sectional view of a pressure receiving plate of another embodiment, and FIG.
FIG. 4 is a sectional view in which an upper plate and a lower plate of the pressure receiving plate are separated.

FIG. 9 is a cross-sectional view of a ground anchor construction method using a pressure receiving plate of another embodiment.

10 (1) is a sectional view in which a conventional ground anchor construction method is used for slope reinforcement, and FIG. 10 (2) is a front view thereof.

[Explanation of symbols]

 1 Pressure Receiving Plate 2 Upper Plate 3 Lower Plate 4 Inner Cylinder 5 Outer Cylinder 6 Through Hole 7 Void 8 Slope 9 Ground 10 Anchor Hole 11 Anchor Fixing Body 12 Tensile 13 Opening 14 Fixing Tool 15 Concrete

Claims (3)

[Claims] 1. A front end portion of a tension member is fixed to an anchor fixing member in the ground, and a rear end portion led out from an opening portion of an anchor hole penetrates a pressure receiving plate composed of an upper plate and a lower plate made of FRP. A ground anchor construction method characterized in that, after penetrating into a hole and fixing with a fixing tool, concrete is poured into a void portion for concrete placing, which is composed of the upper plate and the lower plate, and its surroundings. 2. The inner cylinder protruding from the FRP upper plate is F
It is fitted into an outer cylinder protruding from the RP lower plate to form a through hole extending between the upper plate and the lower plate, and the upper plate and the lower plate form a void for concrete pouring. The pressure receiving plate for the ground anchor method, which has been characterized. 3. The pressure receiving plate for the ground anchor construction method according to claim 2, wherein the upper plate and the lower plate are detachable.