JPH06316938A - Slope reinforcement anchor, and reinforcing method therewith - Google Patents

Abstract

PURPOSE:To strengthen adhesion of anchorage material to earth, and to ensure integration of anchorage material and earth in for sloping natural ground. CONSTITUTION:A slope reinforcement anchor is made by providing a plurality of grouting holes 5 and a plurality of antislipping rods 3 to the circumferential wall of a cylindrical reinforcement material 1, and is constructed so that a push-out device for pushing out each of the antislipping rods 3 can be inserted into the cylindrical reinforcement material 1. The slope reinforcement anchor is inserted into a hole bored in a slope, and the antislipping reds 3 are made to penetrate into natural ground by operation of the push-out device. After the push-out device is extracted rearward from the cylindrical reinforcement material 1, grout is injected from the rear part of the cylindrical reinforcement material 1, and the slope is reinforced by filling the inside of the cylindrical reinforcement material 1 and the bore with the grout.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope reinforcing anchor construction method for reinforcing a ground of a slope, especially a cut slope, and a slope reinforcement anchor used in the construction method.

[0002]

2. Description of the Related Art Conventionally, an anchor method or a reinforcing bar insertion method has been adopted as a similar method for reinforcing the ground of a slope, especially a cut slope. The anchor method is to insert an anchor rod made of high-strength steel into a boring hole drilled in the ground of a slope that requires reinforcement, and grout mortar into the hole to fix the anchor rod to the ground. Then, the stumbling load of the ground is to be borne by the pull-out resistance and the shear resistance of the structure. Then, the stumbling load of the natural ground acting on the anchor rods constituting the structure is transmitted to and supported by the fixed ground through the anchor rods, and the structure and the natural ground are integrated and stabilized. In addition, the reinforcing bar insertion method inserts a relatively short rock bolt into a boring hole drilled in the ground of a slope requiring reinforcement, grouts mortar into the hole, and fixes the rock bolt on the ground. By using the surface protection material provided on the surface and the rock bolt together, the ground is acted as a simulated structure, and the sloping load of the ground is supported by the synergistic action of the surface protection material and the rock bolt to stabilize the slope. is there.

[0003]

In the above-mentioned conventional anchor construction method, when the anchoring ground that can be anchored is deep, a lot of land is required on the back side of the slope in order to lengthen the anchor rod, but the land is saved. And it is necessary to limit the length of the anchor rod in order to prevent invasion into adjacent land.
In addition, since the grout material is directly injected into the boring hole after the anchor rod is inserted into the boring hole, there is a risk that the pouring pressure of the grout material may cause the collapse of the ground of the boring hole wall. Therefore, there was concern about the reliability of the anchor strength as a structure that bears the stumbling load of the ground as pull-out resistance and shear resistance. In addition, in the reinforcing bar insertion method, after inserting the rock bolt into the boring hole, the grout material is directly injected into the boring hole, so there is a risk that the ground pressure of the boring hole may collapse due to the injection pressure of the grout material, etc. It is difficult to fix grout and surface protection material on the ground. Therefore, the stability of the slope is uncertain and the reliability is poor, and there is a risk that the slope may be collapsed due to a construction error or the like.
The present invention has been proposed in view of the above problems of the prior art, the object of the present invention is to have a relatively short anchor material, but there is adhesion to the ground, the grout of the boring hole It is intended to provide a slope-reinforcing anchor and a construction method which are reliable and can be expected to have sufficient pull-out resistance and shear resistance.

[0004]

The present invention has achieved the above object in a slope reinforcing anchor and a construction method. For this reason, the slope reinforcement anchor construction method involves placing a tubular reinforcement having a plurality of grout holes and a plurality of non-slip rods capable of protruding in the peripheral wall in a boring hole drilled in the slope ground, and then each slip stopper. Engage the engaging piece of the pull-out means with the rear end of the rod and pull it toward the base end side of the tubular reinforcing member to project the anti-slip rod diagonally rearward to penetrate into the ground, and engage the engaging piece of the pull-out means. Of the non-slip rod from the rear end of the non-slip rod and pull it backward from the tubular reinforcement, close the base end of the tubular reinforcement with a cap, and inject the grout material into the inner periphery of the tubular reinforcement, Pour out the grout material from the grout hole on the peripheral wall of
I tried to reinforce the slope.

The slope reinforcing anchor of the present invention comprises a plurality of grout holes formed in the circumferential wall of the tubular reinforcing member in the circumferential direction and a plurality of guide means holding the anti-slip rods so as to project therefrom. And the tip of the cylindrical reinforcing member is attached to the tip and the inlet of the grout material is provided at the base end, and the pull-out means for engaging the rear end of each anti-slip bar to project the anti-slip bar to the outside is provided. ing.

[0006]

According to the present invention, after the cylindrical reinforcing member having the grout hole and the guide means for holding the anti-slip rod so as to be able to project is driven in the boring hole drilled in the slope ground,
The non-slip rod is guided by engaging the engaging piece of the pull-out means with the rear end of the non-slip rod held by the guide means provided on the tubular reinforcing member and pulling it out toward the proximal end side of the tubular reinforcing member. It can be projected obliquely rearward from the means to penetrate into the ground. Also, push out the withdrawing means in the direction of the tip of the tubular reinforcing material, remove the engaging piece of the withdrawing means from the rear end of the anti-slip rod, withdraw the withdrawing means from the tubular reinforcing material, and cap the proximal end of the tubular reinforcing material. Close with. Next, the grout material is injected into the inner circumference of the tubular reinforcing material, and the grout material is injected from the grout hole in the peripheral wall of the cylindrical reinforcing material into the outer boring hole. Therefore, the tubular reinforcing material and the ground are integrated by the non-slip rod and the grout material, and the slope ground can be reinforced with greater strength.

[0007]

1 and 2 show an embodiment of a slope reinforcing anchor a of the present invention. The slope reinforcing anchor a is provided with a plurality of grout holes 5 on a peripheral wall of a tubular reinforcing member 1 and a non-slip rod. A plurality of guide means 6 that holds the non-slip members 3 are provided, and the anti-slip rods 3 can be projected by pushing the rear end of each anti-slip rod 3 by the pulling-out means 4. The grout holes 5 of the tubular reinforcing member 1 are bored in the circumferential direction and the longitudinal direction, and the upper and lower two are formed on the same circumference.
Guide means 6 are arranged at certain positions in the longitudinal direction at regular intervals. Further, a conical tip recess 7 is provided at the tip of the cylindrical reinforcing member 1 so that it can be easily inserted into the boring hole c or driven into the tip ground b, and the base end of the cylindrical reinforcing member 1 is provided. A collar 8 for supporting the tubular reinforcing member 1 when the pulling-out means 4 is pulled out to the outer periphery of the
Is provided. Then, a cap 2 is detachably screwed to the base end of the cylindrical reinforcing member 1, and the cap 2 is provided with an injection means e for the grout material d, for example, an insertion port 9 for an injection hose.

The anti-slip rod 3 mounted on the guide means 6 of the tubular reinforcing member 1 is shaped like an arrow so that the tip of the anti-slip rod can easily penetrate into the ground b. Further, the pull-out means 4 for projecting the anti-slip rods 3 are separately provided on the anti-slip rods 3 in the upper row and the lower row, respectively, and the anti-slip rods 10 provided with an annular tension member 10a at the rear end A plurality of engagement pieces 11 that engage with the rear end of the rod 3 are provided at the same intervals as each anti-slip rod 3. At the rear end of the non-slip rod 3, an engaging piece 11 of the pull-out means 4 is provided.
May be directly engaged, but when the anti-slip rod 3 is formed to be long, the pulling-out operation of the upper and lower two pulling-out means causes the pulling-out means to move up and down to collide with each other. In order to do so, as shown in FIG. 2, a lateral projection piece 3a is laterally projected at the rear end of each anti-slip rod 3.
Then, the engaging pieces 11 of the upper and lower pulling-out means 4 are respectively engaged with the horizontal projecting pieces 3a in the upper and lower rows.

Next, a construction method for reinforcing the ground by using the slope reinforcing anchor a will be described with reference to FIGS. A boring hole c having a diameter slightly larger than that of the slope reinforcing anchor a is formed in the ground b of the slope, and the boring machine 1 is provided as shown in FIG.
2 is drilled to a predetermined depth, and then the slope reinforcing anchor a machined to the designed length is inserted from the tip recess 7 into the boring hole c and driven. In this case, as shown in FIG. 4 (b), the brim 8 of the tubular reinforcing member 1 is supported by a boring machine or the like to pull out the pulling means 4.
The pull-out rod 10 of the above is grasped by the tension member 10a, and the tubular reinforcing member 1
When it is pulled out from the proximal end side, the non-slip rod 3 is projected obliquely rearward from the guide means 6 via the lateral projection piece 3a of the non-slip rod 3 that is engaged with the engaging piece 11 of the pull-out rod 10 Penetrate into. Then, the pull-out rod 10 is pushed back toward the tip end of the tubular reinforcing material 1, the engaging piece 11 is removed from the lateral protruding piece 3 a of the anti-slip rod 3, and the pulling-out means 4 is removed from the tubular reinforcing material 1.

Subsequently, the base end of the cylindrical reinforcing member 1 is attached to the cap 2
And the leakage prevention material f for the grout material d at the rear position in the gap between the outer circumference of the cylindrical reinforcing member 1 and the inner circumference of the boring hole c.
After filling, the grout material d is injected into the inner periphery of the tubular reinforcing material 1 by inserting an injection means e of the grout material d, for example, an injection hose from the insertion port 9 provided in the cap 2. When the inner circumference of the tubular reinforcing member 1 is filled with the grout material, the grout material is poured out from the boring hole c of the peripheral wall of the tubular reinforcing member 1 to the outside of the cylindrical reinforcing member 1 and the boring hole c. The grout material is filled between the inner walls. In addition, the two-dot chain line shown in FIG. 3 represents the expected sloping surface of the slope ground, and the arrow indicates the siding direction of the ground.

[0011]

According to the present invention, with the pull-out means installed in the slope reinforcing anchor, the anti-slip rod mounted on the guide means of the tubular reinforcing material is projected obliquely rearward from the guide means to penetrate into the natural ground. , The grout material is injected into the inner circumference of the tubular reinforcing material, and the grout material is injected into the inner circumference of the cylindrical reinforcing material and the boring holes on the outer circumference of the cylindrical reinforcing material, so that the cylindrical reinforcing material is fixed to the ground and sloped. It constitutes a structure for reinforcement. And, due to the synergistic effect of the anti-slip rod and grout material that penetrated the natural ground,
The pullout resistance and the shearing resistance can be greatly increased as compared with the conventional anchor. Therefore, although it is a relatively short tubular reinforcing material, it is possible to transmit the stumbling load of the natural ground and the like to the fixed ground through the tubular reinforcing material to support it and to integrate and stabilize the structure and the natural ground. I can. In addition, the grout material is injected into the boring hole by inserting the grout material injection means from the insertion port of the cap arranged at the base end of the tubular reinforcing material and injecting it into the inner periphery of the tubular reinforcing material. Since it is injected into the boring hole on the outer periphery of the tubular reinforcing material through the grout hole provided in the reinforcing material, it is possible to reliably fill the grout material throughout the hole without collapsing the peripheral wall of the boring hole.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a slope reinforcing anchor of the present invention.

FIG. 2 is an enlarged vertical sectional view and horizontal sectional view of a main part of FIG.

FIG. 3 is a vertical sectional view showing a slope reinforcing anchor construction method of the present invention.

FIG. 4 is an explanatory view (a) showing a state where a boring hole is excavated and a state where a tubular reinforcing member is inserted into the boring hole in the slope reinforcement anchor construction method of the present invention (b).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical reinforcing material 3 Non-slip rod 4 Drawing means 5 Grout hole 11 Engaging piece

Claims (2)

[Claims] 1. A method of anchoring when reinforcing a ground on a slope, which is a tube having a plurality of grout holes on a peripheral wall and a plurality of non-slip bars that can project in a boring hole drilled in the ground. After placing the cylindrical reinforcing material, engage the engaging piece of the pulling-out means with the rear end of each anti-slip rod and pull it toward the proximal end side of the tubular reinforcing material to project the anti-slip rod obliquely rearward. Insert the engaging piece of the pull-out means from the rear end of the anti-slip rod, pull out the pull-out means rearward from the tubular reinforcing material, close the proximal end of the tubular reinforcing material with a cap, and then insert the tubular reinforcing material. A slope-reinforcing anchor construction method characterized in that the grout material is injected into the inner periphery of the, and the grout material is poured out from the grout hole of the peripheral wall of the tubular reinforcing material to reinforce the slope. 2. An anchor used to reinforce the ground of a slope, wherein a plurality of grout holes and a non-slip rod are projected on a circumferential wall of a tubular reinforcing material in the circumferential direction and the longitudinal direction thereof. With a plurality of guide means held so that it can be attached, a tip reinforcement is attached to the tip of the cylindrical reinforcing material, and a grout material inlet is provided at the base end, and the anti-slip rod is engaged with the rear end of each anti-slip rod. A slope reinforcing anchor comprising a pulling-out means for projecting the outside.