JPH05287737A - Spacer for ground anchoe, spacer, structure, and construction method for new material ground anchor - Google Patents

Abstract

PURPOSE:To hold a ground anchor in a proper position, to be suitable for a new material ground anchor having excellent corrosion resistance and improve corrosion resistance of a spacer to hold a tensile material in a drilled hole. CONSTITUTION:A spacer 18 is formed such that a disc part 19 having a plurality of circular holes 19a and notches 19b in which tensile material 3 are respectively inserted and a plurality of protrusion parts 20 protruded from the outer periphery of the disc part 19 are integrally formed by using synthetic resin, such as rigid plastic. Thus, since the disc part and the protrusion parts are integrally formed by using synthetic resin, the tensile materials can be held in a correct position for a long period. Further, the number of parts and the number of processing works can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground anchor spacer for holding a plurality of tensile members inserted in a hole formed in soil such as a slope at a predetermined position in the hole, And a spacer of a new material ground anchor, a structure of the new material ground anchor, and a construction method of the new material ground anchor.

[0002]

2. Description of the Related Art A ground anchor is one in which a plurality of tensile materials are inserted into a drilled hole formed in soil such as a slope, and grout is filled in the drilled hole to fix the tensile member at the bottom. It is to be applied with tension. The use of the new material tension material is characterized by high tensile strength and great corrosion resistance.

However, when the ground anchor is inserted into the soil in a slanted or horizontal manner, the tensile member is displaced by its own weight to the lower portion in the drilled hole. In order to prevent this displacement, spacers are provided at a plurality of positions in the length direction of the tensile member. However, in normal construction, a pipe is inserted into the drilled hole to prevent collapse of the soil on the inner wall of the drilled hole, a tensile material is inserted and grout is filled, and the pipe is pulled out before the grout solidifies. For this reason, the outer diameter of the spacer must be smaller than the inner diameter of the pipe, and after the pipe is pulled out, a gap more than the wall thickness of the pipe is generated between the inner circumference of the drilled hole and the outer circumference of the spacer. There is a problem that the tensile material is displaced by its own weight.

In order to solve this problem, conventionally, one end of a leaf spring formed of iron or the like is fixed to the outer periphery of the spacer, and when the tension member is inserted into the pipe, the leaf spring is compressed by the inner wall of the pipe and the pipe is pulled out. After that, the other end of the leaf spring was brought into contact with the inner wall of the drilled hole to prevent displacement of the tension member.

[0005]

However, if a spacer having a leaf spring made of metal as described above is used, it is necessary to attach a leaf spring as a separate component to the spacer, which increases the number of components and the number of mounting steps. There was a drawback to Further, there is a problem that it is difficult for the tensile member to be located at the center of the drilled hole.

The present invention has been made in view of the above circumstances, and has a simple structure for the ground anchor, which holds the ground anchor at an appropriate position and can be applied to a new material ground anchor having excellent corrosion resistance, and a new spacer. An object of the present invention is to provide a spacer of a material ground anchor, a structure of a new material ground anchor, and a construction method of the new material ground anchor.

[0007]

In order to achieve the above object, the present invention provides a ground anchor for holding a plurality of tension members inserted in a drill hole at predetermined radial positions in the drill hole. In the spacer of (1), a disc portion having a plurality of holes through which the tension members are inserted and a plurality of protrusions protruding from the outer periphery of the disc portion are integrally made of synthetic resin such as hard plastic. It is characterized in that it is formed.

Also, a new material gland for holding a plurality of new material tensile members made of carbon fiber, aramid fiber or glass fiber inserted in the drilled hole at a predetermined radial position in the drilled hole. In the spacer of the anchor, a disk portion having a plurality of holes through which the tensile member is inserted and a plurality of protrusions protruding from the outer circumference of the disk portion are made of synthetic resin such as hard plastic. It is characterized by being integrally formed.

Further, in the structure of the new material ground anchor which holds a plurality of new material tension members inserted in the hole at predetermined radial positions in the hole, the tension members are inserted. It is characterized by having a spacer in which a disc portion having a plurality of holes and a plurality of protrusions protruding from the outer periphery of the disc portion are integrally formed of a synthetic resin such as hard plastic. It is a thing.

The new material tensile member is characterized in that it is formed by twisting together a wire rod made of any one of carbon fiber, aramid fiber and glass fiber.

Further, a new material gland for holding a plurality of new material tensile members made of carbon fiber, aramid fiber or glass fiber inserted in the drilled hole at a predetermined radial position in the drilled hole. In the anchor construction method, a disk portion having a plurality of holes through which the tension member is inserted and a plurality of projections protruding from the outer periphery of the disk portion are integrally made of synthetic resin such as hard plastic. It is characterized in that the spacer formed in 1 is previously attached to the new material ground anchor, and the tensile member is held at a predetermined radial position in the drilled hole by the protruding portion of the spacer.

[0012]

According to the above construction, since the disk portion and the protruding portion of the spacer are integrally formed of synthetic resin such as hard plastic, they do not corrode. Further, since the spacer can be integrally formed, it is not necessary to use a separate member for the protrusion, and the number of parts and the number of processing steps can be reduced. Further, by forming the tensile material from a new material such as carbon fiber, aramid fiber, or glass fiber, tensile strength and corrosion resistance can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spacer for a new material ground anchor of the present invention will be described below with reference to the drawings.

1 to 4 show the configuration of an embodiment of the present invention. In FIG. 3, a concrete layer 1a is formed on an inclined surface such as a slope 1, and the concrete layer 1a
A hole 2 is provided on the inner side in the direction perpendicular to a. Six new material tension members 3 are inserted into the drilled holes 2, and the upper ends of the tension members 3 are fixed to the lower ends of the terminal fixing members 4. A pressure bearing plate 6 is attached via a head sheath 5 at a position where the drilled hole 2 is provided on the upper surface of the concrete layer 1a, and the upper end of the terminal fixing body 4 projects outside the pressure bearing plate 6.

A male screw 4a is formed on the outer periphery of the terminal fixing body 4, and a nut 7 is screwed to the male screw 4a on the outside of the bearing plate 6. Further, a portion where the terminal fixing body 4 projects to the outside of the pressure bearing plate 6 is liquid-tightly covered by a head cap 8, and the head cap 8 is filled with rust preventive oil 9.

The tension member 3 has a free length portion A from the upper end to a boundary portion 10 at a predetermined position, and a boundary portion 10 to a tip portion 11.
Up to the fixing portion B, and a disc-shaped flange 12 is provided at a predetermined position from the upper end in the free length portion A. The flange 12 has six holes 12 as shown in FIG.
a is formed, and the tensile member 3 is inserted into each of the holes 12a. Further, between the terminal fixing body 4 and the flange 12, there is provided a polyethylene sheath 13 which is connected to each outer circumference and is formed of polyethylene in a cylindrical shape. Further, the tension members 3 in the free length portion A below the flange 12 are covered with polyethylene sheaths 14, respectively.

As shown in FIG. 5, one end of a plastic pipe 15 is fixed to the outer periphery of the tensile member 3 at the position of the boundary 10 at the lower end of the free length portion A by an adhesive 16, and the other end of the pipe 15 is fixed. One end of the polyethylene sheath 14 is inserted between the inner circumference and the outer circumference of the tensile agent 3, and is fixed to the inner circumference of the pipe 15 by an adhesive agent 17. Here, the tensile member 3 is formed by twisting together wire rods made of carbon fiber, aramid fiber, glass fiber or the like.

In the free length portion A and the fixing portion B of the tension member 3,
Spacers 18 are attached at predetermined positions.
As shown in FIGS. 1 and 2, the spacer 18 includes a disc portion 19 formed of hard plastic in a substantially disc shape, and a disc portion 1
It is composed of five sets of projecting portions 20 that are integrally formed with the outer circumferential surface 9 and project radially outward from the outer periphery.

A circular hole 19a is formed in the center of the disc portion 19, and five U-shaped notches 19 are formed on the outer periphery in this embodiment.
b are evenly formed. As shown in FIG. 1, the polyethylene sheath 14 is provided in the circular hole 19a and the cutout 19b of the disc portion 19 of the spacer 18 attached to the free length portion A.
The tensile member 3 covered with the is inserted, and the circular hole 19a and the notch 1 of the disk portion 19 of the spacer 18 attached to the fixing portion B are inserted.
9b is an uncoated tensile member 3 as shown in FIG.
Has been inserted.

The protrusions 20 are each composed of three wire rods 20.
When the steel pipe is pulled out, the tip of the wire 20a abuts the inner wall of the drilled hole 2 when the steel pipe is pulled out. It is designed to support its own weight. Although the number of the wire rods 20a is three in this embodiment, it may be one or any number.

Next, a method of constructing the ground anchor having the spacer 18 according to this embodiment will be described. The hole 2 is dug in the slope 1 shown in FIG. 3, and a steel pipe having an outer diameter substantially equal to the inner diameter of the hole 2 is inserted into the hole 2. 6 tensile members 3 held by 4 spacers 18 in this steel pipe
Insert. At this time, the protrusion 20 provided on the spacer 18 bends along the inner circumference of the steel pipe 21 as shown in FIG. At this time, the disk portion 19 of the spacer 18 and the flange 12
Also, by making the outer diameter of each of the terminal fixing bodies 4 slightly smaller than the inner diameter of the steel pipe 21, the tensile member 3 can be inserted into the steel pipe 21.

Next, the grout 22 is filled in the drilled hole 2, and then the tensile member 3 is inserted to the tip of the steel pipe 21. The steel pipe 21 is pulled out before the grout 22 is solidified. As a result of this, FIG.
As shown in, the tip of the protrusion 20 abuts on the inner circumference of the drilled hole 2 and supports the weight of the tension member 3. After that, when the grout 22 is solidified, the tensile member 3 in the fixing portion B is changed to the grout 22.
Is fixed to the inner circumference of the drilled hole 2.

Further, the boundary portion 10 of the free length portion A and the flange 1
The tension member 3 between the two is fixed by the grout 22 via the polyethylene sheath 14. Therefore, during this time, the tension member 3 can move in the length direction. Furthermore, since the tensile member 3 between the terminal fixing portion 4 and the flange 12 is covered with the polyethylene sheath 13, the grout 22 does not enter the inside. Finally, tension is applied to the tension member 3 and fixed by the nut 7.

According to the present embodiment, the spacer 18 for holding the tensile member 3 inserted in the drilled hole 2 is provided with the disc portion 19 having the hole portion through which the tensile member 3 is inserted, and the disc portion. Since the protrusion 20 projecting from the outer periphery of the spacer 19 is integrally formed of hard plastic, the corrosion resistance of the spacer 18 is improved, and the tension member 3 can be held in a correct position. Further, since the protrusion 20 for positioning the spacer 18 with respect to the drilled hole 2 is formed integrally with the disc portion 19, the number of parts and the number of processing steps can be reduced.

The number and arrangement of the tension members 3 and the number and positions of the spacers 18 shown in the above embodiment are not limited to these. Further, the number and shape of the protrusions 20 formed integrally with the spacer 18 are not limited to these. Further, the spacer 18 of the present embodiment is not limited to the new material tensile material, but can be applied to the steel wire material normally used.

[0026]

As described above, according to the present invention,
Since the disk portion and the protrusion are integrally formed of synthetic resin, the tension member can be held in the correct position for a long period of time. Moreover, the number of parts and the number of processing steps can be reduced.

[Brief description of drawings]

FIG. 1 is a view taken along the line D-D in FIG. 3 showing a structure of a spacer provided in a free length portion of an embodiment of a spacer of a new material ground anchor of the present invention.

FIG. 2 is a sectional view taken along line EE in FIG. 3, showing the structure of the spacer provided in the fixing portion of one embodiment of the spacer of the present invention.
FIG.

FIG. 3 is a vertical cross-sectional view showing the structure of a ground anchor to which a spacer according to this embodiment is attached.

FIG. 4 is a view taken along the line CC of FIG.

5 is a vertical cross-sectional view showing a configuration of a boundary portion of FIG.

FIG. 6 is an explanatory view showing a state in which the spacer of this embodiment is inserted into a steel pipe.

FIG. 7 is an explanatory view showing a state after the steel pipe is drawn out of the spacer of the present embodiment.

[Explanation of symbols]

 2 Drilling 3 New material Tensile 18 Spacer 19 Disc part 19a Circular hole (hole) 19b Notch (hole) 20 Projection

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Yamazaki 2222 Shinmachi, Ome, Tokyo Metropolitan Institute of Technology (72) Inventor Katsuya Miyake 2222 Shinmachi, Ome, Tokyo Metropolitan Institute of Technology

Claims (5)

[Claims] 1. A plurality of tensile members inserted into a drilled hole,
In a spacer of a ground anchor which is held at a predetermined radial position in the drilled hole, a disk portion having a plurality of holes through which the tensile member is inserted, and a disk portion protruding from the outer periphery of the disk portion. A spacer for a ground anchor, wherein a plurality of protrusions are integrally formed of a synthetic resin such as hard plastic. 2. A new material gland for holding a plurality of new material tensile members made of carbon fiber, aramid fiber or glass fiber inserted in a hole in a predetermined radial position in the hole. In the spacer of the anchor, a disk portion having a plurality of holes through which the tensile member is inserted and a plurality of protrusions protruding from the outer circumference of the disk portion are made of synthetic resin such as hard plastic. Spacer of new material ground anchor characterized by being integrally formed. 3. The tensile material is inserted in a structure of a new material ground anchor that holds a plurality of new material tensile members inserted in a drilled hole at predetermined radial positions in the drilled hole. It is characterized by having a spacer in which a disc portion having a plurality of holes and a plurality of protrusions protruding from the outer periphery of the disc portion are integrally formed of a synthetic resin such as hard plastic. Structure of new material ground anchor. 4. The ground anchor of the new material according to claim 3, wherein the tensile member of the new material is formed by twisting together a wire made of any one of carbon fiber, aramid fiber and glass fiber. Construction. 5. A new material gland for holding a plurality of new material tensile members made of carbon fiber, aramid fiber or glass fiber inserted in a hole at a predetermined radial position in the hole. In the anchor construction method, a disk portion having a plurality of holes through which the tension member is inserted and a plurality of projections protruding from the outer periphery of the disk portion are integrally made of synthetic resin such as hard plastic. Construction of the new material ground anchor, characterized in that the spacer formed in the above is attached to the new material ground anchor in advance, and the protrusions of the spacer hold the tensile material at a predetermined radial position in the drilled hole. Method.