JP2509160B2 - Embankment anchor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor for embankment to be buried in the ground, and more particularly to an embankment anchor for supporting a retaining wall block or the like.

[0002]

2. Description of the Related Art In order to support a retaining wall or the like, an anchor is used which is arranged behind a retaining wall block and is filled up and buried in the ground. As such an anchor, there is a method in which bare anchor steel materials are lined up on the terrain, and a hardening material such as mortar is sprayed on the land to harden it, and the earth is then embedded and buried in the ground. The load acting on the retaining wall block or the like connecting the anchors is received by the anchors.

[0003]

The problem with such anchors is that the hardened material is only placed around the anchor steel material while it is exposed, so when the load acts, cracks occur in the hardened material around it. It is that there is a gap in the product or that it is cut off. That is, when a load is applied, there is nothing that restrains the hardened material, so that the hardened material easily cracks, and the water that has propagated through the cracks may cause the steel material to rust. Further, the adhesion between the hardened material and the anchor steel material may be broken.

Another problem in the present invention is the problem of construction period. When spraying hardened material on site,
If the hardening material is not sufficiently hardened, the retaining wall block cannot be loaded. Therefore, the embankment could not be embanked for several days until the hardened material was sufficiently hardened, and the construction period was extremely long.
In order to fix the anchor steel material, it is possible to fix the anchor steel material to the precast block and bury it in the ground together with the block, but the precast block can be about 300 kg or more. It takes a great deal of effort to bring it to the construction site for construction. Also, precast blocks are expensive and increase construction costs. In addition, since the surface of the precast block is not familiar with the ground, there is also the problem that it is necessary to bother with unevenness on the surface in order to impart frictional resistance.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an embankment anchor that is not easily affected by cracks and adherence of hardeners and that can be shortened in construction period.

[0006]

In the embankment anchor according to the present invention, an anchor steel material is passed through a sheath. As the anchor steel material, a PC steel twisted wire or a deformed PC steel rod can be used. All or part of this anchor steel material is passed through a deformed fixing sheath having irregularities on its peripheral surface. The deformed sheath may be a stainless steel sheath or a polyethylene sheath. As the anchoring portion of the anchor steel material, the terminal side portion of the anchor steel material, that is, a part on the side opposite to the retaining wall block may be the anchoring portion,
Only this fixing part may be passed through the fixing sheath,
The entire length may be threaded through the anchoring sheath. A cement-based hardening material such as cement paste is injected into the fixing sheath and hardened. Injection and curing is typically several days before field installation.

This anchor steel material is passed through a mold formed by a precast wire mesh material. As the wire mesh material, a porous material similar to the wire mesh such as expanded metal, crimp wire mesh and punch metal can be widely adopted. A square, trapezoidal, or other polygonal formwork is formed from such a wire mesh material. To pass the anchor steel placed in the sheath, make holes on both sides of this formwork,
It should be penetrated through this hole. A wire mesh material for reinforcement can be arranged in the plane direction in the mold.
A fast-hardening material is placed in this form. As the early-hardening material, a cement-based hardening material such as early-hardening mortar or a resin-based early-hardening material can be adopted. Fibers such as steel fibers and resin fibers may be mixed and reinforced in this fast hardening material. The hardened material hardens and becomes a fixing body, and the fixing body and the anchor steel material passed through the sheath are integrated. Embankment is made on this and the anchor steel material and the fixing body are buried in the ground.

[0008]

[Function] The cement-based hardening material inside is constrained by the fixing sheath. As a result, it is difficult for the cement-based hardening material inside and the anchor steel material to be cut off from each other. The hardened material placed in the mold cures quickly and can be immediately filled with soil, so that the anchor can bear the load. The hardened material in the mold can be reinforced by the wire mesh material and the fibers arranged inside to more strongly bear the tensile load. The load applied by the retaining wall block connected to the tip of the anchor steel material is borne by the fixing force of the fixing body.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment shown in the drawings. In the figure, 1 is an anchor steel material, and a stranded wire of PC steel is used. A few meters of the tip of this anchor steel material 1 is passed through the unbonded sheath, and after that, it is exposed to the end. The anchor steel material 1 is further passed through the sheath, the portion passed through the unbonded sheath is arranged inside the polyethylene straight sheath 2, and the exposed portion is placed inside the deformed fixing sheath 3 made of stainless steel. Distribute. Both sheaths 2 and 3
Cement paste 4 is injected therein.

The anchor steel material 1 thus arranged in the sheaths 2 and 3 is passed through a hole 12 formed so as to penetrate two surfaces of the form 5 placed on the terrain. The mold 5 is made of expanded metal and is formed into a substantially trapezoidal frame. The front shape of the mold 5 has a height H of 20 to
30 cm, width W is 50 to 100 cm, and length L is 50 c
m. In the form 5, two wire mesh members 6 are arranged in the plane direction so as to be positioned above and below the anchor steel member 1. A strong resin mortar 7 is placed in the mold 5.
The curing rate of the resin mortar 7 can be adjusted by blending, and the resin mortar 7 to be used is designed to exhibit the required strength in several hours. The mortar 7 conforms to the unevenness of the ground and becomes uneven, and the frictional resistance becomes large, and it is often caught on the surrounding ground. In this way, a plurality of fixing bodies 8 that project to the left and right of the anchor steel material 1 passed through the sheath 3 are formed. The tip of the anchor steel material 1 is connected to the precast retaining wall block 9. Reference numeral 10 is a nut for fixing the anchor steel material 1.

The anchor steel material 1 and the fixing body 8 are buried in the ground by embankment 11 behind the retaining wall block 9. When the retaining wall block 9 is further stacked, the above-described procedure is repeated, the anchor steel material 1 and the form 5 are arranged, the hardening material 7 is cast and fixed, and the retaining wall block 9 is connected. When a load acts on the retaining wall block 9, the load is transmitted to the fixing body 8 through the anchor steel material 1. At this time, the anchor steel material 1 and the fixing body 8 are connected by the mortar 7 containing the wire mesh material 6, but the mortar 7 is reinforced by the wire mesh material 6 and the fixing body 8 does not collapse. Especially the fixing body 8
Although a tensile load acts on this, the tensile load can be received by the wire mesh material 6 and the fibers.

In the above embodiment, the anchor steel material 1 is provided with the unbonded free length portion and the fixing length portion for adhesion. However, the entire length is used as the fixing length, and the anchor steel material 1 is fixed in the deformed sheath of polyethylene. Good. Further, in the above embodiments, the portion of the fixing sheath 3 other than the fixing body 8 is buried in the ground as it is, but dry grout mortar or hard mortar is cast around the sheath 3 and then buried in the ground. Good. Dry grout mortar and hard mortar are hardened by the water in the ground.

[0013]

Since the present invention has the above-mentioned structure, the following effects can be obtained. Since the anchor steel materials are connected to each other in the mold by using a fast hardening material, the hardening material can be used as an anchor body in a required time to develop the required strength and bear a load. You can This will significantly reduce the construction period. Since the formwork is made of wire mesh material, it is possible to significantly reduce the labor required for transportation and loading work on site. In other words, there is no need to carry in a heavy precast block,
The construction for creating the fixing body becomes extremely easy. Since the fixing body is formed by setting a hardening material on the formwork on site, the hardening material adapts to the unevenness of the ground and becomes uneven, and the catching becomes large and the resistance increases. Since the anchor steel material is arranged in the sheath, water does not enter into the sheath even if cracks occur, the steel material does not rust, and the anchor can be used for a long time with high reliability. The anchor steel anchorage is located inside the anchoring sheath, and the hardener inside is constrained by the sheath.
Due to this restraint effect, even if the adhesion is broken, the decrease of the adhesion proof strength is small. Since the anchor is firmly fixed by the adhesion of the hardening material at the fixing portion and the fixing force of the fixing body, it is possible to bear a large load. A tensile load acting on the fixing member can be effectively received by arranging the wire mesh material in the mold or mixing the fibers in the hardening material.

[Brief description of drawings]

FIG. 1 is a perspective view of an embankment anchor according to the present invention.

FIG. 2 is a plan view of an embankment anchor.

FIG. 3 is a front view of a formwork.

FIG. 4 is a cross-sectional view showing a state in which the terrain is leveled.

FIG. 5 is a cross-sectional view showing a state in which an embankment anchor is installed.

FIG. 6 is a cross-sectional view of an embankment state.

[Explanation of symbols]

 1 Anchor Steel Material 2 Straight Sheath 3 Fixing Sheath 4 Cement Paste 5 Formwork 6 Wire Mesh Material 7 Resin Mortar 8 Fixing Body 9 Retaining Wall Block 10 Nut 11 Embankment

Claims (5)

(57) [Claims] 1. A form made of wire mesh material placed on the terrain, in which all or part of the anchor steel material is placed in a fixing sheath having irregularities on its peripheral surface and a hardening material is injected into the sheath. An anchor steel material arranged in the fixing sheath so as to penetrate through, a fast hardening material is filled in the formwork to form a fixing body, and embankment is performed to embed the anchor steel material and the fixing body. Become an embankment anchor. 2. The embankment anchor according to claim 1, wherein a resin-based hardening material is used as the early-hardening material. 3. The embankment anchor according to claim 1, wherein a early-strength cement-based hardening material is used as the early-strength hardening material. 4. The embankment anchor according to claim 1, 2 or 3, wherein fibers such as steel fibers and resin fibers are mixed in the early hardening material. 5. The embankment anchor according to claim 1, wherein a wire mesh material is arranged in the form in the plane direction of the form.