JPS6355294A - Barrel of rock-drill tool - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a barrel used in a rock drilling tool and to a method of using this tool.

[Conventional technology]

This type of rock drill utilizes a firing chamber to fire the cartridge into the barrel. The tool is used by inserting the barrel into a pre-drilled and water-filled rock prior to ignition. As the cartridge is fired into the hole, the expansion of the gases caused by the ignition creates pressure on the water in the form of a shock wave, which fractures the rock.

[Problem that the invention seeks to solve]

Known rock drilling tools of this type have an elongated barrel located longitudinally in a pre-drilled hole, the tip of which is provided with a radially expandable seal. This seal retains the tool within the bore sufficiently for the exhaust gases to reach the inner circumferential surface of the seal through an opening in the side of the barrel. Without such a means of retaining the tool in the hole, the tool would be thrown back out of the hole due to recoil, and much of the energy that would have fractured the rock would be lost.

This type of barrel has longitudinal exhaust openings on its sides and is configured to provide a lateral impact force of the exhaust gases on the rock surrounding the hole. The tip remote from this lateral exhaust opening for inflating the seal is closed.

The rock drilling tool and method of use described above also requires drilling a fairly long hole to accommodate the entire length of the barrel and the side exhaust openings. It is important that this hole has fairly accurate dimensions and is not too large in diameter. because,
This is because the holes tend to disperse and waste impact energy.

Additionally, the holes need to be relatively watertight, and the deeper the holes are drilled, the greater the chance of leakage.

[Means for solving problems]

The present invention provides a novel barrel for use in rock drilling tools,
It is also an object of the present invention to provide a method for crushing rocks using this barrel, thereby overcoming the above-mentioned drawbacks.

According to the invention, a hole is drilled in the rock, the hole is substantially filled with water, and a barrel of a rock drilling tool is inserted into it, which fires a cartridge from a firing chamber into the barrel. fragmenting the rock by imparting an energetic impact to the water by firing a cartridge into the hole, the barrel used for this step being short enough to be inserted only into the entrance of the hole, and the blast absorbing mat being a tool. A method for rock drilling characterized in that the outer diameter of the barrel tapers toward the discharge opening end, the barrel being disposed over the circumference of the tool to substantially hold the tool in place during the firing operation. The barrel is secured in position by contacting the inner circumferential wall of the hole around the end of the barrel on the firing chamber side.

Further, the mat has a central opening with a reinforced peripheral edge;
the end of the tool on the firing chamber side extends through the mat;
The periphery of the opening is configured to rest on a lateral handle on the tool.

According to another aspect of the invention, there is provided a barrel configured for use in a rock drilling tool, the tool being inserted into a pre-drilled and water-filled hole in the rock to be fractured. configured to insert the barrel and fire a cartridge through the barrel and into the bore, the barrel being connected to a firing chamber at one end thereof and having an ejection opening end opposite the firing chamber end; a single discharge opening at the end thereof, and the barrel is of such length that, in use, only a portion of the barrel is inserted into a water-filled rock hole. It is composed of

An important feature of the present invention is that the outside diameter of the barrel towards the discharge opening end facilitates insertion of the barrel into a hole drilled in rock with a standard size drill, and the firing chamber of the barrel is The side end portion is tapered to such an extent that it comes into contact with the periphery of the hole when in use.

The present invention also extends to a rock drilling tool comprising the aforementioned barrel, and a rock drilling rig comprising the rock drilling tool and a blast absorbing mat placed over the rock drilling tool during use, the mat being provided with a blast absorption mat that covers the rock drilling tool. Prevents the cartridge from flying out of the hole during firing.

The invention includes a mat having a central opening with a reinforced periphery and resting over a lateral handle of a rock drilling tool to cover the tool;
A portion of the tool extends through the hole and the periphery of a mat resting on the handle, and the reinforcement prevents the periphery of the mat from expanding and ejecting the tool from the central opening during firing of the tool. is configured to do so.

Preferably, the mat is reinforced with wire,
Preferably, the mat is approximately 2.3M in area and is woven from rubberized tape, a material used in automobile tires. This mat is square and has a thickness of about 15 cranes, 1.5 m x
It has dimensions of 1.5 m.

〔Example〕

In FIG. 1, a barrel 1 for a rock drilling tool has a cylindrical shape,
The end 2 has a slightly narrower diameter and is threaded with a thread 3 to be screwed into the ignition chamber 4. Discharge end 5 on the opposite side of the barrel
is provided with the only discharge opening 6 of the barrel and extends axially through the barrel. The outer diameter of the barrel slopes smoothly from the firing chamber side end 2 towards the discharge opening side end 5.

In use, the barrel, connected with the firing chamber to form the tool 7, is inserted into a hole 8 in the rock, which has been previously drilled and filled with water. This hole 8 is bored with such a diameter that the entrance 9 of the hole is closed by the barrel 1 when the barrel is inserted. Preferably, this blockage occurs when the barrel contacts its firing chamber side end with the inner circumferential wall of the entrance of the hole. Most of the length of the barrel needs to be inserted into the bore in this way.

The taper of the barrel is chosen such that the barrel is easily insertable into the hole, but fits relatively snugly into a hole having a diameter within the tolerances expected from a standard size drill.

In practice, for a 3611 drill for drilling a 381 m hole, a taper of 38 mm to 34 mm in outer diameter from end to end of a 140 mm long barrel shaft is preferred.

Since the barrel does not have a gripping mechanism, auxiliary restraint means are provided to prevent the tool with the barrel from flying out of the bore upon firing.

According to FIG. 2, the mat 10 is about 1.5 m x 1.5 m.
It forms a 5m square. The mat is woven from a tape of rubber tire material and has a thickness of about 15 mm. It has a round central opening 11 with wire reinforcement around its periphery to prevent expansion.

In use, this mat is placed over a rock drilling tool 12 such that the upper firing chamber 13 of the tool projects through the cough hole and the outer periphery of the hole rests on the lateral handle 14 of the tool. There is. In fact, the mat was found to retain recoil force effectively.

Many variations are possible from the above embodiments without departing from the scope of the invention. For example, the range of barrel taper varies widely depending on the tool and the size of the hole to be drilled, as well as the size and shape of the mat.

The mat may also be circular, but this is inconvenient for folding and transporting.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a barrel of the present invention installed in a hole in a rock, and FIG. 2 is a perspective view of a blast protection mat of the present invention. 1 - Barrel 4 - - Ignition chamber 7 - Tool 8 - Rock hole 9 - Hole entrance 10 - Margin below mat

Claims (1)

[Claims] 1. Drilling a hole in a rock and substantially filling the hole with water;
This includes the step of inserting a barrel of a rock drilling tool that fires a cartridge from a firing chamber into the barrel, and firing the cartridge into the barrel imparts an energetic impact on the water to fracture the rock. The barrel is short enough to be inserted only into the entrance of the hole, and a blast absorbing mat is placed around the tool to substantially hold the tool in place during the firing operation. Rock drilling method characterized by what was done. 2. The outer diameter of the barrel of the rock drilling tool used is tapered toward the discharge opening end, and the barrel is positioned in contact with the inner circumferential wall of the hole around the firing chamber side end of the barrel. A method as claimed in claim 1, which is secured in the following claims. 3. The mat has a central opening with a reinforced periphery, the end of the tool facing the firing chamber projects through the mat, and the periphery of the opening rests on a lateral handle provided on the tool. A method as claimed in claim 1. 4. A barrel configured to be used in a rock drilling tool, the tool inserting the barrel into a hole previously drilled in the rock to be crushed and filled with water; the barrel is connected to a firing chamber at one end thereof and extends slightly from the firing chamber end toward the opposite discharge opening end. a cylindrical barrel member, the discharge opening side end having a single discharge opening, and the barrel having a length such that only a portion of the barrel is inserted into a rock hole filled with water during use; Barrel made up of. 5. The outer diameter of the barrel is toward the discharge opening side end, making it easier to insert the barrel into a hole drilled in rock with a standard size drill, and the firing chamber side end of the barrel is in use. 5. The barrel according to claim 4, wherein the barrel is tapered to such an extent that it contacts the periphery of the hole. 6. A rock drilling tool equipped with a barrel according to claim 5. 7. A rock drilling apparatus comprising a rock drilling tool according to claim 6 and a blast absorbing mat installed to cover the rock drilling tool during use, wherein the mat is A rock drilling rig having the purpose of preventing said tool from flying out of the hole during firing of the cartridge. 8. A mat used in the rock drilling rig according to claim 7. 9. a mat having a central opening with a reinforced periphery and resting on the lateral handle of the rock drilling tool to cover the tool, a portion of the tool passing through the hole and the mat resting on the handle; 9. The mat of claim 8, wherein the reinforcement is configured to project during tool firing and to prevent expansion of the peripheral edge of the mat from ejecting the tool from the central opening. 10. The mat according to claim 9, wherein the periphery of the hole in the mat is reinforced with wire. 11. The mat according to any one of claims 8 to 10, wherein the mat is woven from a tape that is a material for automobile tires. 12. The mat according to claim 11, wherein the mat has an area of about 2.3 m^2. 13. The mat according to claim 11, wherein the mat is square and has dimensions of approximately 1.5 m x 1.5 m. 14. The mat of claim 11, wherein the mat has a thickness of about 15 mm.