JPS5937400B2 - Lock bolt construction method - Google Patents

Description

[Detailed Description of the Invention] In the conventional rock bolt construction method, a hole is drilled with a rock drill or an air auger, and after the hole is drilled, mortar is filled into the hole using a mortar feeder, and the rock bolt is pushed into the hole using manual or mechanical force. I'm reading.

According to the above-mentioned conventional method, there are problems in that the hole wall of the perforated portion is likely to become rough, which may result in poor filling of mortar and difficulty in inserting bolts.

The present invention has been proposed to solve these problems, and includes a pressure fluid injection tube concentrically installed in the outer tube, and a pressurized fluid injection tube is injected from the outer tube while the outer tube is grounded. A mortar in which a mortar injection pipe is penetrated and fixed after penetrating a mountain and drilling a perforation part in the same ground, and then pulling out the injection pipe, and a rock bolt is penetrated and inserted in a relatively movable manner. Fitting the injection packing into the outer tube, and then anchoring the tip of the rock bolt to the ground, and then pulling out the outer tube and the mortar injection tube while injecting mortar into the perforation from the mortar injection tube. This relates to the rock bolt construction method, which is characterized by:

As described above, in the present invention, instead of using the pressure fluid injection pipe alone, the injection pipe is installed concentrically in the outer pipe, and pressurized fluid is injected into the ground from the tip of the pipe to inject the same into the ground. Since the outer pipe penetrates the ground while drilling, the outer pipe prevents earth and sand from collapsing from the inner circumferential wall surface of the hole into the hole, and the hole wall is not roughened. .

Then, the present invention provides a mortar injection packing in which the pressure driftwood injection pipe is pulled out from the outer pipe, the mortar injection pipe is inserted and fixed therein, and the lock bolt is inserted in a relatively slidable manner. The tip of the rock bolt is anchored to the ground by fitting it into the outer pipe and forcibly penetrating the tip of the rock bolt into the ground, or by hardening it to the ground via a fast-setting agent. While injecting mortar from the mortar injection pipe, the outer tube, mortar injection pipe, and mortar injection packing are removed from the perforation, so that the mortar is crimped while sufficiently consolidating the ground in front of the packing, and the mortar is crimped into the perforation. The rock bolt is tightly packed into the hole and is solidly connected to the inner circumferential wall of the hole, so that the lock bolt is securely anchored to the hole.

In addition, at this time, the mortar injection packing is pressed toward the proximal end of the outer tube by the pressure of the mortar filled in the perforation, and the outer tube, the mortar injection packing, and the mortar injection tube can be easily pulled out. .

As described above, the present invention provides a rock bolt construction method that is easy to perform and highly reliable.

The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes an outer tube constituting a casing pipe, and a bundle 2 is integrally provided on the outer periphery near the base end of the outer tube, and a digging blade portion 3 is provided at the tip.

A pressure fluid injection tube 4 is inserted through the outer tube 1 and is held concentrically within the outer tube 1 via a center holder 5 that projects radially from the outer periphery of the injection tube 4. There is.

Then, pressurized air or pressure water is injected into the ground from the pressure fluid injection pipe 4, and the bundle 2 is operated to swing the outer tube 1 from side to side to penetrate the ground, thus penetrating the ground. Drill the hole A.

Next, the injection tube 4 is pulled out from the outer tube 1, the mortar injection tube 6 is fitted and fixed, and the mortar injection packing 8, in which the lock bolt 7 is slidably fitted, is fitted into the outer tube 1. After penetrating the tip of the rock bolt 7 into the ground or fixing it to the ground with a fast-setting agent, and thus anchoring the tip of the rock bolt 7 to the ground, mortar is poured into the perforation A from the mortar injection pipe 6. While pouring, insert the outer tube 1, mortar injection tube 6, and mortar injection packing 8 into the hole A.
The lock bolt 7 is then pulled out, and the hole A is filled with mortar to anchor the lock bolt 7 in the hole A.

At this time, the mortar injection pressure is
The packing 8 and the mortar injection pipe 6 can be easily pulled out.

Although the present invention has been described above with reference to embodiments, the present invention is, of course, not limited to such embodiments, and can be modified in various designs without departing from the spirit of the present invention. .

[Brief explanation of drawings]

1 and 2 are longitudinal sectional side views showing the steps of an embodiment of the rock bolt construction method according to the present invention, and FIGS. 3 and 4 are the lines ■-■ in FIG. 1 and the lines in FIG. It is a longitudinal cross-sectional view cut along the IV-IV line. 1...Outer pipe, 4...Pressure fluid injection pipe,
7...Rock bolt, 6...Mortar injection pipe, 8...Mortar injection packing.

Claims (1)

[Claims] 1. A pressure fluid injection pipe is installed concentrically inside the outer pipe, and while injecting pressure fluid from the injection pipe, the outer pipe is penetrated into the ground to excavate a hole in the ground, and then the injection pipe is inserted into the ground. After pulling it out, a mortar injection packing into which a mortar injection pipe is inserted and fixed and a rock bolt is relatively slidably penetrated is fitted into the outer tube, and then the tip of the rock bolt is inserted into the ground. A rock bolt construction method characterized in that after anchoring, the outer pipe and the mortar injection pipe are pulled out while injecting mortar into the perforation from the mortar injection pipe.