JP2002038864A - Boring rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the property of emitting cuttings when a hole is bored in the ground with a rock drill. SOLUTION: A boring rod 21 is provided with a coil spring 25 wound around a rod body 23. One end of the coil spring 25 is fixed to a bit 24, and the other end thereof is formed into a free end in an axially movable manner so as to rotate the coil spring 25 with the rod body 23 and vibrate the coil spring 25 through the use of the striking force imparted to the rod body 23 during a boring operation. Consequently, the cuttings, which get in between the adjacent coil parts of the coil spring 25, are urged to be emitted from the hole by the rotation and vibration of the coil spring 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piercing rod mounted on a rock drill such as a jack hammer for piercing a ground or the like.

[0002]

2. Description of the Related Art Rock drills such as jack hammers and drifters are widely used for drilling ground and rock. A rod with a bit is connected to this rock drilling machine, and a hole and a hole are drilled in the ground and the rock by applying a rotating force and a striking force to the rod with the bit. When drilling deeply, a relay rod is provided between the rock drill and the rod with a bit. In the case of a rock drill that drives a piston using compressed air as power, a part of the compressed air is sent to the air supply hole at the center of the rod, and the compressed air is ejected from the injection hole at the tip of the bit. I have. This is to blow out the cutting powder (crushed debris) generated by the perforation to the outside of the hole.

[0003] In addition, after drilling a ground or the like,
There is a so-called self-perforated anchor which is left in the hole without being taken out of the hole and grout is injected into the hole and used as an anchor as it is.

[0004]

In the above-described drilling of the ground or the like, if the generated dust is a dry powder such as rock powder, it can be blown out of the hole by the compressed air. However, in the case of soft ground, the cutting powder becomes relatively heavy like earth and sand, and the hole wall surface collapses during drilling, and the amount of the cutting powder increases. For this reason, for example, a hole of about 1 m blocks the air jet port of the bit, so that the dust is not discharged, the bit does not rotate due to the load of the dust, and further drilling may not be performed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention combines a perforated rod with a coil spring, and uses a rotation and a vibration of the coil spring to enhance the discharge of cutting powder. .

That is, the present invention relates to a drilling rod which is attached to a rock drill for drilling a ground or the like and is provided with a rotating force and a striking force. A coil spring extending in the axial direction of the rod with a gap between the peripheral surface and the coil spring, wherein the coil spring has a pitch toward the rod tip when traveling around the rod body in the rotation direction of the rod body. , And one end thereof is fixed near the tip of the rod body, and the other end is formed at a free end so as to be movable in the axial direction.

In such a perforated rod, the cutting powder generated sequentially at the tip end of the hole enters between adjacent coils of the coil spring. The coil spring rotates together with the rod body. In drilling, the drilling depth of the piercing rod is usually shorter than the pitch of the coil which advances when the coil spring makes one rotation. In the same manner as described above, the dust between the coils moves relatively along the coil due to the rotation of the coil spring and is pushed out of the hole. At this time, the coil spring vibrates in the axial direction with the hit of the rod body by the rock drill, and the vibration prevents the dust from being attached to the rod body and the coil, so that the dust is discharged. The resistance when moving in the direction decreases.

[0008] The piercing rod may be a rod to which a bit is connected to the tip, a relay rod, or a self-piercing anchor.

The present invention also relates to a piercing rod as described above, wherein a bit is connected to a tip of the rod body, and the rod body extends in the axial direction at the center of the rod body and is located near the bit. The air supply hole which opened the air ejection port is formed in the peripheral surface.

Thus, the compressed air can be sent to the air supply hole and ejected from the air ejection port at the distal end, and the compressed air can be used to promote the discharge of the dust.
When an air compression type rock drill is used, a part of the compressed air may be supplied from the rock drill to the air supply hole. Alternatively, a compressed air supply source may be provided and connected to the air supply hole.

[0011] Further, when the relay rod is connected to a piercing rod having such an air supply hole, an inlet of the air supply hole is opened at the base end surface of the piercing rod, and the center of the relay rod is also connected to the center. An air supply hole penetrating in the direction may be formed, and the air supply holes of both rods may be connected to each other.

[0012]

As described above, according to the present invention, there is provided a coil spring whose pitch advances toward the tip of the rod when it goes around the rod body in the rotation direction of the rod body.
While one end is fixed to the vicinity of the tip of the rod body, the other end is a free end, so that the rotation and vibration of the coil spring can be used to promote the discharge of cuttings, even in soft ground, Deep digging can be performed without causing clogging of the cuttings.

[0013] In addition, a perforated rod having an air supply hole having an air ejection port opened in the peripheral surface of the rod body in the vicinity of the bit can promote the discharge of the cutting dust by using the compressed air, and can remove the cutting dust. It is even more advantageous for emissions.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

This embodiment is an example in which the piercing rod according to the present invention is used as a self-piercing anchor in a slope stabilization method.

In FIG. 1, reference numeral 1 denotes a mountain slope, and 2 denotes a landslide surface. A metal net 3 is stretched on the slope 1 so as to avoid the standing tree 4, and the net 3 is held at a position deeper than the landslide surface 2 of the ground by a perforated rod (self-perforated anchor) 5 and a support plate 6.

The piercing rod 5 is attached to a jack hammer 7 as shown in FIG. 2 and is provided with a rotating force and a striking force for piercing. In this embodiment, the jack hammer 7
Is movably supported by a guide 9 of a tripod 10 in which one leg is a guide 9. That is, the support plate 11 is movably supported by the guide 9, and the jack hammer 7 is attached to the support plate 11. The support plate 11 is supported so as to move up and down by rotation of an operation rod 13 having a handle 12 with respect to the guide 9.

A ground plate 14 is fixed to the lower end of the guide 9, and the ground plate 14 is fixed to the ground by a screw-type anchor 15. A positioning plate 16 is fixed slightly above the ground plate 14 of the guide 9, and a pipe 17 for positioning the guide 9 through the perforated rod 5 is fixed to the positioning plate 16.

<About the piercing rod> As shown in FIG. 3, there are two types of piercing rods 5, one of which is a rod 21 with a bit, and the other one is a relay rod 22 for extending the piercing length. It is.

The rod 21 with a bit is a rod body 23
A bit 24 coupled to the tip of the rod body 23;
And a coil spring 25 that goes around the rod body 23. At the other end of the rod body 23, the relay rod 2
2 or jack hammer 7 coupling (female screw) 2
A male screw (not shown) for screw connection with the screw 6 is formed. The coil spring 25 extends in the rod axial direction over a substantially entire length of the rod body 23 with a gap between the coil spring 25 and the peripheral surface of the rod body 23. One end (tip) is fixed to the bit 24, and the other end is a shaft. It is formed at the free end so that it can move in the direction. Also, the coil spring 25
When the jack hammer 7 rotates around the rod body 23 in the rotation direction of the rod body 23, the pitch is formed so as to progress toward the rod tip.

As shown in FIG. 4, the rod body 23 has
An air supply hole 2 extending in the center toward the axial end.
7 are formed. The air supply hole 27 branches in four directions in front of the bit 24 and opens an air outlet 29 on the peripheral surface of the rod body 23. The inlet of the air supply hole 27 is opened at the base end surface of the rod body 23 to receive the supply of compressed air from the jack hammer 7 side. The branch passage 30 on the tip end side of the air supply hole 27 is supplied with compressed air, which will be described later, through the air ejection port 29.
It is inclined toward the proximal end so as to squirt more toward the proximal end.

The intermediate rod 22 is a rod 2 with a bit.
As in the first embodiment, a rod body 23 is provided, and a coil spring 25 is provided around the rod body 23. At one end of the rod body is formed a coupling 26 for coupling with the bit-fitted rod 21 or another relay rod, and at the other end, a male screw for screw coupling with another coupling rod or the coupling 26 of the jack hammer 7. 31 are formed. One end of the coil spring 25 is connected to the coupling 26, and the other end is formed at a free end so as to be movable in the axial direction. Further, an air supply hole (not shown) is formed in the rod body 23 so as to penetrate the center portion in the axial direction.

<Construction procedure of slope stabilization method> The construction procedure of the slope stabilization method is as follows. Metal net 3 avoiding standing trees 4 on slopes such as mountains
Put up. The ground is pierced by the piercing rod 5 in order to fix the peripheral portion of the net 3 and an appropriate portion inside the net 3 to the ground. The perforation rod 5 used for the perforation is driven into the ground, and a lower supporting plate (not shown) having a through hole in the center is passed through the male screw 31 of the perforation rod 5 and set on the ground. Grout is injected around the perforated rod 5 from the central through hole of the lower support plate. A support plate (upper support plate) 6 having a through hole in the center is passed through the male screw 31 of the perforated rod 5 and engaged with the lower support plate. The cap 32 is screwed onto the male screw 31 of the perforated rod 5 from above the support plate 6 and the support plate 6 is fastened to the ground.

<Regarding Drilling by Drilling Rod> In the above drilling, a tripod 10 is set up at the drilling location.
The rod with bit 21 is connected to the coupling 26 of the jack hammer 7. Then, the jack-hammer 7 applies a rotating force and a striking force to the bit-attached rod 21 to perform drilling. The dust generated by the perforation enters between adjacent coils of the coil spring 25.

The coil spring 25 rotates together with the rod body 23.
It is normal that the depth of the rod with bit 21 digging is shorter than the pitch of the coil that advances when one turns. In an extreme case, the coil spring 25 is in a state close to the state where it is rotating at a fixed position. Accordingly, the dust between the coils moves relatively along the coil by the rotation of the coil spring 25 and is pushed out of the hole.

At this time, the coil spring 25 vibrates in the axial direction in response to the rod hammer 23 being hit by the jack hammer 7, and the shavings cause the rod body 23 to vibrate.
And it can be prevented from sticking to the coil
Resistance when the dust moves in the discharge direction is reduced.
Also, a part of the compressed air of the jack hammer 7 is supplied to the air supply hole 27 and is ejected from the air ejection port 29 to the outside of the hole through the branch hole 30.
Discharge of the above-mentioned dust is promoted. The fine grinding powder is pushed out of the hole through a gap between the coil spring 25 and the peripheral surface of the rod body 23.

In the case of deep drilling, the intermediate rod 22 is added to the bit-equipped rod 21.

As described above, the dust is formed by the coil spring 2.
The discharge is promoted by the rotation, vibration and blow-up by compressed air of 5, so that even if it is a moist heavy powder or a large amount of powder generated due to collapse of the hole wall surface, it is discharged without delay. can do. Therefore,
It is possible to prevent the load applied to the drilling rod 5 from being increased due to the dust and stop its rotation or to make it impossible to hit, so that it is possible to drill deeply even on soft ground.

Although the above embodiment is an example in which the piercing rod is used as a self-piercing anchor, the piercing rod may be used exclusively for piercing, and the anchor may be separately inserted into the hole after piercing.

In the above embodiment, the piercing rod is attached to the jack hammer, but may be attached to the drifter.

In the above-described embodiment, the air outlet 29 is opened on the peripheral surface of the rod body 23. However, as shown by a chain line in FIG. In addition to supplying compressed air to the fitting hole 35, the air supply hole 36 extends from the fitting hole 35 toward the peripheral surface of the bit 24 to open the air ejection port 37 on the peripheral surface. Good.

In the above embodiment, the air supply hole for the compressed air is provided in the piercing rod. However, such an air supply hole is not provided, and the dust is discharged only by the rotation and vibration of the coil spring. Good. In that case, a solid reinforcing bar can be used as the rod main body, which is advantageous for cost reduction.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a slope stabilization method.

FIG. 2 is a perspective view showing an excavator according to the present invention.

FIG. 3 is a front view showing a state in which a rod with a bit as a piercing rod according to the present invention and a relay rod are connected.

FIG. 4 is a sectional view showing a part of a rod with a bit according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Slope of mountain area 2 Landslide surface 3 Metal net 4 Standing tree 5 Drilling rod 6 Support plate 7 Jack hammer 9 Guide 10 Tripod 11 Support plate 12 Handle 13 Operating rod 14 Grounding plate 15 Screw-in anchor 16 Positioning plate 17 Pipe 21 With bit Rod 22 Relay rod 23 Rod body 24 Bit 25 Coil spring 26 Coupling 27 Air supply hole 29 Air ejection port 30 Branch path 31 Male thread

Claims (2)

[Claims] 1. A piercing rod attached to a rock drill for piercing a ground or the like and provided with a rotating force and a striking force, comprising: a rod main body; and a periphery of the rod main body and a peripheral surface of the rod main body. A coil spring extending in the axial direction of the rod with a gap therebetween, wherein the coil spring is arranged so that the pitch advances toward the tip of the rod when the coil spring rotates around the rod body in the rotation direction of the rod body. A perforated rod characterized in that it is formed and one end thereof is fixed near the tip of the rod body, and the other end is formed at a free end so as to be movable in the axial direction. 2. The perforated rod according to claim 1, wherein a bit is connected to a tip of the rod body, and the rod body extends in a central portion of the rod body in an axial direction, and a rod is provided near the bit. A perforated rod, wherein an air supply hole having an air jet opening is formed in a peripheral surface of a main body.