JP2000027592A - Boring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring apparatus that is capable of correcting directions easily. SOLUTION: A bit l2 is bent at a specified angle against a boring pipe 14. On executing straight boring, boring is made with the bit 12 rotated. On correcting the direction of boring, the front end face 12D in the direction of bend of the bit 12 is turned to the direction to which the correction is to be made, and the direction correction is made by executing the boring with the bit 12 swung at a fixed angle of swing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring device, and more particularly to a boring device capable of correcting the direction of excavation.

[0002]

2. Description of the Related Art A boring apparatus used for burying gas pipes, water and sewage pipes, and conduit pipes in the ground corrects the direction of excavation in the case where a borehole deviates from a planned line. It is configured to be able to. The conventional boring device is configured so that the drilling direction can be corrected by forming a tapered surface on a part of a bit attached to the tip of a drilling pipe. In this boring device, usually, a straight excavation is performed by rotating a bit, and when correcting the direction, the rotation of the bit is temporarily stopped and directed in a direction opposite to the direction in which the tapered surface of the bit is corrected,
The direction is corrected by giving thrust to the bit. That is, if only the thrust is applied without rotating the bit, the tapered surface formed on the bit rides on the ground, so that the desired direction correction is performed.

[0003]

However, if the direction is corrected by the above-described mechanism, the bit cannot be propelled if there is a solid obstacle such as gravel at the point to be corrected. There was a disadvantage that it was not possible to correct the direction. The present invention has been made in view of such circumstances, and has as its object to provide a boring device capable of easily correcting a direction.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a boring apparatus for excavating underground by rotating a dug pipe having a bit attached to a tip thereof. In the straight excavation, the excavation is performed by rotating the bit, and when correcting the direction, the excavation is performed by swinging at a constant swing angle in a direction in which the tip of the bending direction of the bit is corrected. Is performed to correct the direction.

According to the present invention, straight excavation is performed by rotating a bit. Then, at the time of direction correction, the direction correction is performed by swinging at a fixed swing angle and excavating the tip of the bent bit in the bending direction leading end surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a boring device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a side view showing an overall configuration of an embodiment of a boring device according to the present invention.

[0007] As shown in FIG.
Is a drilling pipe 14 having a bit 12 at its tip, and the drilling pipe 1
The rotation propulsion device 16 that applies rotation and thrust to the motor 4 is configured as a main part. The rotary propulsion device 16 is installed in a pit 18 excavated from the ground. This rotary propulsion device 16
Has a rotary propulsion device main body 22 that slides on a guide rail (not shown) provided on the base 20. The rotary propulsion device main body 22 is provided with a propulsion cylinder 24. By driving the propulsion cylinder 24, the rotary propulsion device main body 22 moves back and forth on the guide rail. The rotary propulsion device body 22 is provided with a swivel joint 26, and the excavation pipe 14 is connected to the swivel joint 26. This swivel joint 2
The motor 6 is rotated by obtaining a rotational force from a motor 28, and the rotation is transmitted to the excavated pipe 14, and the excavated pipe 14 is rotated.

The rotary propulsion device 16 having the above structure drives the propulsion cylinder 24 to propel the excavated pipe 14.
Driving tube 14 is rotated by driving motor 28. FIGS. 2A and 2B are a front view and a side view, respectively, showing the configuration of the tip portion of the excavation pipe 14. As shown in FIG.
2 are installed. The bit 12 is formed in a cylindrical shape, and has a vent portion 12A, a straight portion 12B, and a connecting portion 1B.
2C.

The vent portion 12A has the same diameter as the straight portion 12B, and is connected to the tip of the straight portion 12B at a predetermined angle. For this reason, the bit 12 has a bent shape at the connecting portion between the straight portion 12B and the vent portion 12A. On the other hand, the connecting portion 12C has a smaller diameter than the straight portion 12B, and is connected coaxially with the rear end of the straight portion 12B. The bit 12 is attached to the excavation pipe 14 by inserting the connecting portion 12C into the tip of the excavation pipe 14 and fixing the bit with pins 30.

[0010] The bit 12 having the above-described structure is provided on the tip surface 1 thereof.
In the 2D, eight teeth 32, 32,... Are implanted at equal intervals along the periphery, and the teeth 32, 32,.
Drill the ground with to create holes. Note that this bit 12
Is provided with a transmitter (not shown), and a radio wave is transmitted from the transmitter toward the ground. On the other hand, a position detector 34 is provided on the ground, and the position detector 34 detects a transmission point of a radio wave, thereby detecting a bit position in the ground.

The excavation pipe 14 to which the bit 12 is attached is formed so as to be extendable by successively adding excavation pipes having a fixed length. The added pipe is
It is fixed with a pin in the same manner as when the bit 12 is attached. At this time, the position of the pin and the tip surface 12 of the bit 12
By keeping the direction of D constant, and detecting the position of the pin of the excavation pipe in the pit 18, the direction of the tip surface 12D of the bit 12 in the ground can be detected.

The operation of the boring apparatus 10 according to the present embodiment, constructed as described above, is as follows. First, the tip surface 12D of the bit 12 provided at the tip of the drill pipe 14
Abut against the face. Next, the propulsion cylinder 24 of the rotary propulsion device 16 is driven to advance the rotary propulsion device main body 22 to apply a thrust to the excavation pipe 14. At the same time, the motor 28 is driven to transmit the torque to the excavation pipe 14 to rotate the bit 12 in one direction. The drill pipe 14 is provided with the rotating bit 12
The ground is excavated by the teeth 32, 32,... And excavated by the thrust given from the rotary propulsion device 16.

FIGS. 2 (a) and 2 (b) show a situation when a straight excavation is being performed. At this time, bit 12 is
Since the tip is formed to be bent, when it is rotated in one direction, it excavates while overcutting a hole 36 having a diameter larger than the outer diameter of the excavation pipe 14 as shown in FIG. Now, bit 1 is detected by the position detector 34 installed on the ground.
Assume that it has been confirmed that the position of No. 2 has shifted below the plan line. When the operator confirms the displacement of the bit 12, first, the rotation and the propulsion of the excavation pipe 14 are temporarily stopped. Next, based on the information from the position detector 34, the direction to be corrected and the amount of deviation are detected.

Next, the operator turns the direction of the distal end face 12D of the bent bit 12 in the direction to be corrected. Here, since the direction of the tip surface 12D of the bit 12 can be detected from the position of the pin of the excavation pipe 14 in the pit 18, the tip surface 12 of the bit 12 is positioned based on the position of the pin. In the above example, bit 12
Is shifted below the plan line, so that bit 12
Needs to be directed upward.

By the above operation, the tip surface 1 of the bit 12
When the 2D is oriented in the desired correction direction (upward in the above example), the operator then drives the propulsion cylinder 24 to propel the digging tube 14. At the same time, the operator drives the motor 28 to swing the bit 12 at a predetermined swing angle. FIGS. 3A and 3B respectively show bit 1
2A and 2B are a front view and a side view showing a situation when the direction correction is being performed by 2;

As shown in FIG.
When the bit 12 is swung while the 2D is oriented in the direction to be corrected, the ground in the direction to be corrected is excavated by the teeth 32 provided on the tip end surface 12D of the bit 12. Further, when the bit 12 is propelled in a state where the tip end surface 12D of the bit 12 is oriented in the direction to be corrected,
The vent 12A of the bit 12 rides over the ground, and the bit 12 propels in the direction to be corrected.

As described above, by propelling the bit 12 while excavating the ground in the direction to be corrected, even if there is a solid obstacle such as gravel at the point where the direction is to be corrected, it can be easily obtained. The direction of excavation can be modified. When the necessary correction is completed, the operator switches the driving of the motor 28 from the swinging rotation to the rotation in only one direction, and rotates the bit 12 in one direction to perform the straight excavation.

As described above, according to the boring apparatus 10 of the present embodiment, by propelling the bit 12 having the bent distal end while swinging, the teeth 32, 32,
It is possible to excavate while excavating the ground in the direction to be corrected. As a result, even when there is a solid obstacle such as gravel at the point where the direction is to be corrected, the direction of excavation can be easily corrected.

Further, by correcting the direction in such a manner, the thrust at the time of correcting the direction is reduced. Therefore,
Long-distance horizontal excavation or curved excavation can be performed with high accuracy. Furthermore, since the boring device 10 of the present embodiment has a very simple configuration in which the bit 12 is bent at a predetermined angle with respect to the excavation pipe 14, the device can be downsized,
Manufacturing costs can also be reduced.

In addition, the boring device 10 of the present embodiment
The direction correction operation using the
Since it is only necessary to swing the direction of D in the direction to be corrected, the operation can be easily performed, and the working time can be reduced. In the boring device 10 of the present embodiment, the bit 12 is rotated by rotating the excavated pipe 14 by the motor 28 of the rotary propulsion device 16. And bit 12
May be configured to rotate independently.

Further, in this embodiment, a transmitter is installed on the bit 12 and the position of the bit 12 in the ground is detected by detecting the transmission point of the radio wave by the position detector 34 installed on the ground. But in addition to this,
Bit 12 underground using a known underground radar or the like
May be detected.

[0022]

As described above, according to the present invention,
Since the bit is propelled while excavating the ground in the direction to be corrected, even if there is a solid obstacle such as gravel at the point where the direction is to be corrected, the direction of excavation can be easily corrected. .

[Brief description of the drawings]

FIG. 1 is a side view showing an entire configuration of an embodiment of a boring device according to the present invention.

FIG. 2 is a front view and a side view showing a configuration of a tip portion of a digging pipe.

FIGS. 3A and 3B are a front view and a side view showing a situation when a bit is correcting a direction; FIGS.

[Description of Signs] 10 ... Boring device 12 ... Bit 12A ... Vent portion 12B ... Linear portion 12C ... Connecting portion 14 ... Drilling tube 16 ... Rotation propulsion device 34 ... Position detector 36 ... Drilling hole

Claims (1)

[Claims] 1. A boring apparatus for excavating underground by rotating a dug pipe having a bit attached to a tip thereof, wherein the bit is bent at a predetermined angle with respect to the dug pipe, and the bit is rotated during straight excavation. A boring device wherein the direction is corrected by swinging at a fixed swing angle toward the direction in which the tip of the bit in the bending direction is corrected when the direction is corrected.