JPH11148289A - Self-standing construction method for perforated wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for self-standing a perforated wall and drilling it without dusting nor using air bubbles. SOLUTION: In the case of drilling a natural ground with a drilling tool, the breaking down of a pebble, earth and sand in a hole is prevented. The natural ground is therefore drilled as an aqueous solution of one or more substances selected from a group of natural polymer substance, semi-synthetic polymer substance excepting carboxymethylcellulose and synthetic polymer substance is atomizedly jetted from a drilling tool tip 1 together with compressed air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hole wall self-supporting method for preventing collapse of a hole wall when drilling a rock bolt hole, an anchor bolt hole, an explosive charging hole, or the like in a ground using a drill. .

[0002]

2. Description of the Related Art Conventionally, when drilling a ground using a drill for various purposes, a large amount of drilling water, specifically, 30 to 60 liters of water per minute, is sprayed, and the water flows. Water drilling is performed to discharge drilling dust.

[0003] However, according to this method, a large amount of drilling water is applied to the hole wall, so that in soft rock, the hole diameter expands or water penetrates into cracks, causing pebbles and the like to collapse, and a hole having a desired shape is formed. It was difficult to open. In recent years, tunnels have become large in cross section, and long lock bolts and anchor bolts have been used. Even in ordinary ground, collapse of pebbles and the like has become a problem.

Therefore, as a method of making the hole wall self-supporting, there is a method of discharging the dust by using compressed air without using water at all. However, this method generates remarkable dust and deteriorates the working environment. Is not preferred. Japanese Patent Application Laid-Open No. Hei 5 (1994) -53566 discloses a bubble perforation that generates bubbles and uses the bubbles instead of water.
-287076 and the like. However, according to this method, the discharged air bubbles are very unlikely to be defoamed and remain in the work place, so that the working environment becomes poor. In order to eliminate bubbles quickly, a large amount of water must be sprayed or an antifoaming agent must be sprayed, which is inefficient. In addition, these foams are sent to the discharge pit in a state containing the dust, where the foam and the dust must be separated and processed.

The present invention has been made to solve the above problem, and proposes a method of perforating a hole without using dust and without using air bubbles to make the hole wall self-supporting.

[0006]

Means for Solving the Problems The present inventors have conducted intensive studies to achieve the above object, and as a result, drilled while spraying an aqueous solution of a polymer substance together with compressed air in the form of a spray from the tip of a drill. As a result, it was found that a hole having a desired shape in which the hole wall was self-supporting was obtained, and the present invention was completed.

That is, the hole wall self-supporting method of the present invention is a hole wall self-supporting method for preventing collapse of pebbles, soil and the like in a hole when drilling a hole in the ground with a drill. The method is characterized in that an aqueous solution of at least one substance selected from the group consisting of a semi-synthetic polymer material except methyl cellulose and a synthetic polymer material is sprayed from the tip of a drilling drill together with compressed air in the form of a spray to form a hole. Is what you do.

[0008] In the above, as the natural polymer substance,
Any of starches, mannan, seaweeds, plant mucilage, microbial mucilage, protein, and semi-synthetic macromolecules include alkylene oxide adducts, methylated products, carboxymethylated products of these natural polymer materials ,
Phosphate, any of the cationized compounds, synthetic polymer substances include polyvinyl alcohol, modified polyvinyl alcohol, sodium polyacrylate, polyacrylamide, sodium acrylate acrylamide copolymer, polyethylene oxide, polyethylene glycol, polyvinyl Any of pyrrolidone can be used (claim 2).

[0009] The viscosity of the above-mentioned aqueous solution of the polymer substance is 5 to 1
It is preferably set to 000 mPa · s (claim 3).

The surface tension of the aqueous polymer solution is 6
It is preferably at least 5 dyne / cm (claim 4).

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the self-standing pore wall method of the present invention, one or more polymer substances selected from a natural polymer substance, a semi-synthetic polymer substance excluding carboxymethyl cellulose, and a synthetic polymer substance Using an aqueous solution of

Examples of natural high molecular substances include starches, mannan, seaweed, plant mucilage, microbial mucilage, and protein.

More specifically, starches such as starch and α-starch obtained from various plants, and seaweeds such as seaweed, agar, sodium alginate, etc.
As a plant mucilage, guar gum, locust bean gum, quince seed gum, arabinogalactan gum, gum arabic, tragacanth gum, etc. Examples include glue, casein, collagen and the like.

Examples of the semi-synthetic polymer substance include a substance obtained by adding the above-mentioned natural polymer substance to a raw material and adding an alkylene oxide such as ethylene oxide or propylene oxide, or methylation, carboxymethylation, phosphorylation, or cationization. And the like.

Examples of the synthetic polymer include polyvinyl alcohol, modified polyvinyl alcohol, sodium polyacrylate, polyacrylamide, sodium acrylate acrylamide copolymer, polyethylene oxide, polyethylene glycol, and polyvinylpyrrolidone.

The aqueous solution of the polymer substance used in the present invention preferably has a viscosity of 5 to 10,000 mPa · s, more preferably 10 to 5,000 mPa · s,
More preferably, it is 20 to 2,000 mPa · s.
If it is less than 5 mPa · s, penetration into the cracks in the hole wall starts, and the hole wall becomes insufficiently self-supporting. In addition, 10,000
When the pressure is larger than mPa · s, a powerful pump is required at the time of pumping the aqueous solution, which is not economical.

The surface tension of the aqueous solution is 65 dyn.
It is preferably at least e / cm, and if it is less than e / cm, foaming will occur, and the above-mentioned problem of foam perforation will occur.

The supply amount of the aqueous solution is preferably about 1 to 20 liters per minute in ordinary perforation. If it is less than 1 liter, the dust is almost dry and dust is generated. 20
If the amount is larger than 1 liter, the pore wall has a self-supporting effect, but it is uneconomical because the used amount of the aqueous solution increases, and problems such as increased stickiness of the cutting powder and deterioration of the scaffold are likely to occur.

By setting the supply amount to about 1 to 20 liters per minute, not only the hole wall is kept independent, but also the state of discharging the dust is good, and the used chemical solution requires processing such as separation. The cuttings can be treated as excavated soil without flowing out as wastewater.

The above-mentioned aqueous solution of the polymer substance is compressed with compressed air,
When sprayed in the form of a spray from the tip of the drill, it hits the hole wall and simultaneously collides with the dust and is mixed, and adheres to the hole wall surface. Since the mixture of the aqueous polymer material solution and the cutting powder has a considerably higher viscosity than water, it hardly penetrates into the cracks in the ground, so that the pebbles and the sediment hardly collapse. Also, in the part where cracks are originally occurring,
These sticky cutting powders play a role of an adhesive, and act to prevent collapse of pebbles and the like.

Although the punching device used in the present invention is not particularly limited, an outline of an example of the punching device is shown in FIG.

As shown in the figure, the drilling device includes a drill 1, a rod 3 attached to the tip of the drill 1 via a swivel joint 2, a bit 4 attached to the tip of the rod 3, a drill 1 And the rod 3
, And a polymer substance aqueous solution supply unit connected to the swivel joint 2. The polymer aqueous solution supply unit includes an aqueous solution storage unit 6, a pressure pump 7, a flow control device 8, a compressor 9, and a conduit connecting these components to each other.

In the above-mentioned perforating apparatus, compressed air is supplied from a compressor 9, while the aqueous polymer solution is pumped at a higher pressure than the above-mentioned compressed air by a pressure pump 7 and adjusted to a predetermined flow rate by a flow rate adjusting device 8. Is done.
After the aqueous polymer solution merges with the compressed air, it is supplied into the rod 3 through the swivel joint 2 and is sprayed from the bit 4 at the tip of the rod 3 in a spray form. The bit 4 pierces the ground 20 while spraying the aqueous polymer solution in this way. The injected aqueous solution of the polymer substance adheres to the surface of the hole wall 21 as described above, and prevents the collapse of pebbles and earth and sand.

The present method is applicable not only to drilling in a rock having weak cracks, but also to drilling long rock bolt holes and anchor bolt holes in a tunnel having a large cross section, which will be increased in the future, in ordinary ground. This is also useful as an efficient hole wall self-supporting method.

Further, the method of the present invention does not require a drainage treatment because the perforation is performed without using a large amount of water or air bubbles, and can be obtained by the foam perforation because of good adhesion between the ground and the fixing mortar. No strong fixability is obtained.

[0026]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Examples (Test Nos. 1 to 5) Rock bolt holes having a length of 4 m were drilled in a cracked ground with a drilling device.

The aqueous solutions of the polymer substances shown in Table 1 were prepared, and the supply amounts were adjusted as shown in Table 1 by a flow rate adjusting device. On the other hand, the compressed air was adjusted to the air pressure shown in Table 1 by a pressure regulating valve. The aqueous solution and the compressed air were merged and perforated while being sprayed from the bit at the tip of the rod.

The perforation time was determined by measuring the time required for perforation. After the perforation, the independence of each hole wall was examined. The independence of the hole wall is determined by inserting a mortar injection hose into each hole and if it can be inserted up to the drilling position, it is determined that independence has been secured. Judged that it was not secured.

After that, for the self-standing hole, a mortar was injected, a lock bolt was inserted, and after 72 hours, a pull-out test with a load of 10 t was performed. Table 2 shows the results.

Comparative Example (Test No. 6) Using a conventional device for water perforation, water was injected at a rate of 40 liters / minute to perform perforation. The drilling time was measured in the same manner as in the above example, and after drilling, the independence of each hole wall was examined. For the self-standing hole, a mortar was injected and a lock bolt was inserted, and after 72 hours, a pull-out test with a load of 10 t was performed. The results are shown in Table 2.

[0032]

[Table 1] .

[0033]

[Table 2] .

As shown in Table 2, the examples (Test Nos.
In 1) to 5), the independence rate is as high as 70% or more. Also,
Since there is no clogging at the time of drilling and pulling, the drilling time can be shortened. Further, all the pull-out tests with a load of 10 t after fixing the lock bolt with mortar passed.

On the other hand, in the water drilling of the comparative example, the independence rate was 15%.
% And very long perforation time due to intermittent clogging.

That is, it was confirmed that the hole wall self-supporting method of the present invention is excellent in the self-sustainability of the hole, the drilling time is short and efficient, and the fixing property of the lock bolt is also excellent.

[0037]

According to the hole wall self-supporting method of the present invention, pebbles are drilled in the ground by spraying an aqueous solution of a polymer substance and compressed air in a spray form from the tip of the drill. Since it is possible to prevent collapse of the bolt, etc., it is possible to form a clean hole with excellent self-sustainability, the drilling time is short and efficient, and the fixing property of the lock bolt is also excellent.

When the viscosity of the aqueous polymer material solution is 5 to 10,000 mPa · s, the self-sustainability of the hole wall is sufficient and the pumping is easy.

When the surface tension of the aqueous solution of the high molecular substance is 65 dyne / cm or more, no foaming occurs, so that problems such as deterioration of the working environment do not occur.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a punching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drilling drill 2 ... Swivel joint 3 ... Rod 4 ... Bit 5 ... Guide cell 6 ... Polymer aqueous solution storage unit 7 ... Pumping pump 8 ... Flow control device 9 ... Compressor 20 ... Chiyama 21 ... hole wall

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Satoshi Fukuyo 154-1, Yotsuku-cho, Nishinasuno-machi, Nasu-gun, Tochigi Prefecture Goyo Construction Co., Ltd. (72) Inventor Yoshiaki Masaki Niho, Hiroshima-shi, Hiroshima 2-1-26-1 Matsuda Astec Co., Ltd. (72) Inventor Yoshinori Yamanaka 2-1-2-6 Nibo, Minami-ku, Hiroshima City, Hiroshima Pref. Mitsuda Astec Co., Ltd. (72) Inventor Yuji Hori Inaba, Otsu City, Shiga Prefecture Table 30-9 (72) Inventor Shuichi Honjo 45-16 Momoyama Minami Oshimacho, Fushimi-ku, Kyoto, Kyoto

Claims (4)

[Claims] 1. A self-standing hole wall method for preventing collapse of pebbles, earth and sand, etc. in a hole when a hole is drilled in the ground with a drill, a natural polymer material, a semi-synthetic polymer material excluding carboxymethyl cellulose, A hole wall self-supporting method characterized in that an aqueous solution of one or more polymer substances selected from the group consisting of synthetic polymer substances is perforated while being sprayed from the tip of a perforation drill together with compressed air in a spray state. 2. The natural polymer substance is any one of starches, mannan, seaweed, plant mucilage, microbial mucilage, and protein, and the semi-synthetic polymer substance has a natural high molecular weight. Any one of an alkylene oxide adduct, a methylated product, a carboxymethylated product, a phosphoric oxide, and a cationized product of a molecular substance, wherein the synthetic polymer substance is polyvinyl alcohol, a modified polyvinyl alcohol, sodium polyacrylate, The method according to claim 1, wherein the method is any one of acrylamide, sodium acrylate acrylamide copolymer, polyethylene oxide, polyethylene glycol, and polyvinylpyrrolidone. 3. The viscosity of the aqueous solution is 5 to 10,000 m.
The hole wall self-supporting method according to claim 1, wherein the pressure is Pa · s. 4. The surface tension of the aqueous solution is 65 dyne /
The hole wall self-supporting method according to any one of claims 1 to 3, wherein the hole wall is not less than 1 cm.