JP2000008379A - Cut soil reinforcing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent collapse of a hole wall and useless diffusion of filler into cracks in a cut soil reinforcing method. SOLUTION: Reinforcement members 1 such as reinforcement bars and lock bolts are placed into a natural ground 2 to reinforce the natural ground 2. In this case, a drill rod 6a is moved forward to form a bored hole 7 while injecting filler 9 from a tip of the drill rod 6a, the drill rod 6a is retracted to be pulled out of the bored hole 7 while injecting the filler 9 from the tip of the drill rod 6a, and then the reinforcement member 1 is inserted into the bored hole 7 where the filler 9 is filled. As the filler 9, cement milk or cement mortar is used, favorably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cut soil reinforcing method for reinforcing a ground by driving a reinforcing material such as a reinforcing bar or a rock bolt into the ground.

[0002]

2. Description of the Related Art The cut-reinforcement earth method is widely used as a measure to prevent medium-scale collapse of soil in the ground, to prevent a steep cut slope, or for temporary slopes when excavating structures. Have been. As shown in FIG. 2, the cut-cut reinforcement earth method reinforces the ground 2 by inserting a number of relatively short reinforcing members 1 such as reinforcing steel bars and rock bolts into the slope of the ground 2. To increase the stability of the In FIG. 2, reference numeral 3 indicated by a broken line is an original slope, and 4 is a normal slope not using the cut-reinforcement earth method. According to the cut-reinforcement earth method, a steeper slope is formed. It can be seen that is possible.

[0003] The construction procedure of the above-described cut-reinforcement earth method includes a slope work 5 (or a slope work) that covers the entire ground 2 to be reinforced, and then works along the ground 2. A scaffold is provided and a rock drill is installed there, or, as shown in FIG. 3, the rock drill 6 is supported by a heavy machine from above the ground surface so as to be opposed to the slope, and the rock drill 6 shown in FIG. It is usual that the reinforcing material 1 is cast in the procedure shown in (1) to (c). That is, first, as shown in FIG. 4A, a drill hole 7 is formed in the ground 2 by a drill rod 6a of the rock drill 6 and the drill rod 6a is pulled out from the drill hole 7, and then as shown in FIG. As shown in the figure, an injection hose 8 is inserted into the hole 7 to fill the hole 9 with a filler 9 such as cement milk or cement mortar, and the injection hose 8 is pulled out. Then, as shown in FIG.
After that, the reinforcing member 1 is inserted into the hole, and thereafter, the bearing plate 10 and the nut 11 are inserted into the holes as shown in FIG.
Attach and tighten the reinforcing material 1 to make the slope 5
It is common to settle for (or a legal framework).

[0004]

As mentioned above, the cut-reinforcement earth method is a method in which a hole 7 is formed near the ground surface of the ground 2 and the reinforcing material 1 is cast, so that the reinforcing object The ground 2 is often weathered and has many cracks, and is often a rock with low strength and collapsible soil that is a deposit of surface slip. Therefore, the hole wall of the drilling hole 7 formed by the rock drill 6 may not be able to stand on its own, and may collapse or the filler 9 filled in the drilling hole 7 may be dissipated in a crack. , Effective remedies were needed.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method of forming a hole by advancing a drill rod while injecting a filler material from the tip of the drill rod and forming a hole from the tip of the drill rod. The drill rod is retracted while the material is being injected, and the drill rod is withdrawn from the drilled hole. Thereafter, the reinforcing material is inserted into the drilled hole filled with the filler. It is preferable to use cement milk or cement mortar as the filler.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cut-reinforcement earth method according to the present invention will be described below with reference to FIGS. 1 (a) to 1 (c). In the cut-reinforcement earth method of the present embodiment, the drill rod 6 of the rock drill 6 is used to form the hole 7 as shown in FIG.
The drill rod 6a is advanced while pouring cement milk or cement mortar as the filler 9 from the tip end of the hole a to form the hole 7.

After the drill hole 7 having a predetermined depth is formed as described above, when the drill rod 6a is pulled out,
Similarly, as shown in (b), the drill rod 6a is pulled out while injecting cement milk or cement mortar as the filler 9 from the tip of the drill rod 6a.

When the drill rod 6a is pulled out from the drilled hole 7, the filler 9 has already been filled up to the hole opening in the drilled hole 7, and as shown in FIG. Insert a reinforcing material 1 such as a lock bolt.

Finally, a bearing plate 10 and a nut 11 are attached to the base end of the reinforcing member 1 and tightened in the same manner as in the prior art, and the reinforcing member 1 is sloped 5 (or framed).
(See FIG. 2).

According to the above-described procedure, since the drilling holes 7 are formed while the filler 9 is being injected, the filler 9 is naturally and reliably filled in the entire drilling hole 7 so that the hole wall can be prevented from collapsing. In addition, the filler 9 naturally penetrates into the cracks, and the adhesiveness between the soil particles increases, and the self-standing stability of the hole wall can be sufficiently increased. Further, since the filler 9 is not dissipated wastefully, the injection amount can be saved, and the cover thickness for the reinforcing member 1 can be ensured. In particular, when cement milk or cement mortar is used as the filler 9 as in the above-described embodiment, the specific gravity of the cement milk or cement mortar is almost the same as that of soil or rock, and cracks and cement milk or cement mortar are used. Since the powder (slime) is injected, there is no waste, and it is more effective as compared with the case where other fillers such as a chemical for stabilizing pore walls are used.

In the prior art, the filling material 9 is filled by inserting the injection hose 8 after the formation of the hole 7. However, in the above method, the hole making step and the filler filling step are performed simultaneously. In this case, the conventional filling material injection step using the injection hose 8 can be omitted, so that the working time can be shortened and the construction period can be shortened.

In the above method, if the filler 9 can be supplied from the base end of the drill rod 6a via a swivel joint and the filler 9 can be injected from the distal end of the drill rod 6a, a general-purpose cutting tool can be used. The rock drill can be adopted as it is or with a slight change, and no particularly complicated device is required.

[0013]

As described above, according to the present invention, a drilling hole is formed while injecting a filler from the tip of a drill rod, and then the drill rod is retracted while injecting a filler to remove the drilling hole from within the drilling hole. Since the reinforcing material is inserted into the drilled hole filled with the filler after that, the filler can be reliably filled into the hole when drilling, and the collapse of the hole wall can be prevented by itself, as well as the filler. Penetrates into the cracks, increasing the cohesion between the soil particles and sufficiently increasing the self-sustaining stability of the pore wall. It is possible to secure the cover thickness for the reinforcing material. Further, according to the present invention, since the drilling step and the filler filling step are performed at the same time, the working time can be reduced, and no particularly complicated apparatus is required. In particular, if cement milk or cement mortar is used as the filler, the specific gravity is almost the same as that of soil or rock, and the cement milk, cement mortar, and cutting powder are injected into the cracks, resulting in waste. Therefore, it is more effective as compared with the case where a filler other than these, for example, a chemical solution for stabilizing pore walls is used.

[Brief description of the drawings]

FIG. 1 is a diagram showing an operation procedure of a cut-reinforcement soil method according to an embodiment of the present invention.

FIG. 2 is a diagram showing an application example of a cut-cut reinforced earth method.

FIG. 3 is a view showing the state of implementation of a conventional cut reinforcing earth method.

FIG. 4 is a diagram showing a work procedure of a conventional cut reinforcing earth method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement material 2 Ground 6a Drill rod 7 Drilling hole 9 Filler

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroki Kawasaki 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kazuo Miyazawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Naoya Sugawara 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation Co., Ltd. (72) Inventor Hiroshi Kagiya 1-27 Koraku, Bunkyo-ku, Tokyo In company

Claims (2)

[Claims] 1. A cut-cut reinforcing earth method for reinforcing a ground by placing a reinforcing material such as a reinforcing bar or a rock bolt into the ground, and filling the drill rod while injecting a filler from the tip of the drill rod. After forming a drill hole by moving forward, the drill rod is retracted while injecting filler material from the tip of the drill rod and pulled out from the drill hole, and then reinforced in the drill hole filled with filler material. A cut-cut reinforced earth method characterized by inserting wood. 2. The method according to claim 1, wherein cement filler or cement mortar is used as the filler.