JP2513075Y2 - Cutting destination conduit device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leading conduit device used in a horizontal bowling cutting method.

[0002]

2. Description of the Related Art A method in which a pipe having a bit attached to the tip of its tip is given a rotational force and a thrust to horizontally shave underground is widely used for pipe work in urban areas such as sewer work. However, this method cannot be used if the bedrock to be cut is particularly hard.

[0003]

[Problems to be Solved by the Invention] Then, when an air hammer was attached to the leading conduit and the hammer's striking force was used together, it was found that even hard rock could be cut. However, when the pipe is rotated in both directions in small increments in order to correct the traveling direction, the air hammer head comes off. This is because the head is attached to the main body by screwing. In addition, since slime (excavated soil) enters around the air hammer, the cutting direction may change and the neck of the hammer head may be damaged.

The object of the present invention is to prevent the head of the air hammer from falling off and prevent the slime from being taken in regardless of the direction in which the tube is rotated.

[0005]

A small section is formed by partitioning the inside of a leading conduit in which a bit is planted in the peripheral edge with a plate, and a cover plate is attached so as to close the opening of this small section. An air hammer is installed in the small compartment such that the hammer head appears and disappears through the hole formed in the cover plate. The hammer head has a non-circular cross section and the hole has a shape adapted to the hammer.

[0006]

When the pipe to be buried is pushed while turning it with a machine, the leading pipe at the head of the pipe advances while cutting the ground with a bit. When you encounter a hard bedrock, activate the air hammer and crush the rock with the hammer's striking force.

When the traveling direction is wrong, the pipe is alternately turned left and right in small steps. This allows the leading conduit to bend in the direction of the hammer and correct the trajectory. When the pipe is turned to the left and right, the hammer head tries to turn in the direction of slack, but since the shape of the hole in which the hammer head appears and disappears matches the non-circular cross-sectional shape of the hammer, it does not sag.

The air hammer 7 is a plate 13 and a cover plate 1.
There is no slime uptake as it is in the compartment surrounded by 5.

[0009]

EXAMPLE As shown in FIGS. 1 to 3, a bit (blade) 3 is planted along the peripheral edge of the tip of a tip conduit 1. The tubular body 5 is attached to the inner surface of the front conduit 1, the main body of the air hammer 7 is housed therein, and the rear part is supported by the thrust block 9 fixed to the front conduit 1. Reference numeral 11 is a pipe for sending compressed air.

The air hammer 7 is mounted so that the head 7a thereof projects further by about 5 mm from the outer diameter of the leading conduit 1. The bit 3 is attached so that the tip of the bit 3 is retracted inward by about 5 mm on the side opposite to the hammer 7, and gradually approaches the hammer 7 toward the outside.

The upper part of the cylindrical body 5 is covered with a plate 13 to cover the small section 1.
4 is formed, and the opening of the small section is closed by the cover plate 15. Cover plate 15
There is a hole 15a in the hammer head 7
a appears and disappears. The head 7a is shaped like a gear, but the hole 15a is shaped to match, so that the head can move axially but rotates with respect to the cover plate or hammer body. It is not possible.

When used, as shown in FIG.
Attach the pipe 21 to be buried in the machine 18 installed in
Push the tube forward while rotating it at a slow speed of several revolutions per minute. The tip conduit 1 advances while shaving the rock with the bit 3. The excavated soil passes through the pipe 21 and is discharged from the vertical shaft. If the bedrock is hard, use a hair hammer 7. The hammer head 7a vibrates back and forth to crush the bedrock, and
Enable the promotion of.

When the core of the pipe is deviated, the hammer head 7a is set so as to face the direction to be corrected, and the pipe 21 is alternated in small increments (for example, at an angle of 120 degrees) centered on this state. Rotate. In this way, the side with the hammer head is cut more than the opposite side, so that the leading conduit bends in the direction with the hammer head. After correcting the direction in this way, the pipe is rotated in one direction again to dig.

When the tube 21 is alternately turned to the left and right in this way, the hammer head 7a is restrained by the cover plate 15 so that it does not rotate in the slack direction, and therefore the head does not drop from the hammer body. . The plates 13 and 15 prevent slime from entering the compartment having the air hammer.

[0015]

As described above, in the escapement tube of the present invention, the cover plate is attached so as to block a part of the tip opening of the leading conduit having the bit attached to the tip, and the cross section of the cover plate is changed. A hole of a shape and size that fits the hammer with a non-circular cross section is made, and an air hammer is attached along the inner wall of the leading conduit so that the hammer head appears and disappears from this hole, and the pipe can be rotated in either direction. Even if it is done, the hammer head does not loosen and fall off, and therefore, there is an effect that the tube can be rotated in the left and right directions in small increments to correct the cutting direction.

Further, since the air hammer is in the section surrounded by the plate, slime is not taken in, and it is possible to prevent the deviation of the traveling direction and the damage of the air hammer.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a leading conduit.

FIG. 2 is a front view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an explanatory diagram of a usage state.

[Explanation of symbols]

 1 tip conduit 3 bit 7 air hammer 7a head 14 small section 15 cover plate 15a hole

Claims (1)

(57) [Scope of utility model registration request] 1. A small section (14) is provided by partitioning the inside of a leading conduit (1) having a bit (3) planted at its periphery with a plate (13), and a cover plate (that closes the opening of this small section). 15) is attached, and the hammer head (7a) appears in and out from the hole (15a) formed in this cover plate, and the air hammer (7) is attached in the small section, and the hammer head has a non-cross section. A drilling conduit device, characterized in that it is circular and the hole has a shape that fits this hammer.