JP3015733B2 - Side hole drilling rig - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lateral hole drilling device,
More specifically, the present invention relates to a side hole excavator provided with a screw auger for excavating a side hole required for piping work under the ground.

[0002]

2. Description of the Related Art As is well known, a screw auger propulsion method is one of the methods for excavating a horizontal hole required for piping a gas pipe, a water pipe, a communication cable pipe, etc. under the ground. is there. In the above construction method, a screw auger propulsion machine installed in one of the shafts is used after excavating a shaft in a location corresponding to the length of the pipe below the ground to be piped. The screw auger is successively added to the screw auger until the length of the screw auger corresponds to the length of the pipe, is propelled in the soil, and excavates a side hole of a required diameter for drawing the pipe.

[0003] An example of a screw auger propulsion machine used for excavation of a lateral hole is disclosed in Japanese Patent Application No. Hei 5 (1994) -197, filed by the present applicant.
No. 242244 discloses a propulsion device. In the above-mentioned conventional example, a moving table installed in a shaft and movable in the longitudinal direction of the pipe, a feed mechanism for moving the moving table in the longitudinal direction of the pipe, and a screw auger provided on the moving table And a drive unit for transmitting a rotational force to a screw auger supported by the chuck mechanism. According to the screw auger propulsion device described above, the screw auger of the required length supported by the chuck mechanism is rotated by the rotational force from the driving unit, and the movable table is propelled by the feed mechanism, so that the horizontal hole is excavated. .

[0004] An electric motor is used for the drive unit, and the torque of the electric motor is transmitted to the screw auger via a speed reduction mechanism. Further, the chuck mechanism can be locked by locking a part of the shaft portion of the screw auger, and the locking position is a position equally divided in the circumferential direction of the shaft portion.

[0005]

By the way, there are various strata in the soil propelled and excavated by the above-mentioned screw auger propulsion machine, for example, a hard earthen stratum or a dry sandy stratum. I do. When excavating the above-mentioned stratum with the screw auger thruster,
When excavating hard earthen rocks, the electric motor that is the driving source is subjected to a considerably high load, and the propulsion excavation cannot be performed with a small electric motor. There is a risk of burning. On the other hand, the chuck mechanism that supports the screw auger has a locking piece for locking the shaft end (square shape) of the screw auger, and the locking piece is supported so as to be able to contact and separate from the shaft. Have been. For this reason, there is a problem that only screw augers that meet the standard can be used, and other items cannot be used. Also, since the contacting / separating operation of the locking pieces is performed by the operator, if the operator does not forget the contacting / separating operation of the locking pieces before and after the excavation work, the screw auger may come off from the chuck mechanism or the rotation force may not be normal. Communication may not be performed.

An object of the present invention is to provide a screw auger which can be smoothly propelled without being affected by the stratum at the place to be excavated, in view of the above-mentioned problems in the conventional lateral hole excavator, particularly in the screw auger propulsion machine. Another object of the present invention is to provide a horizontal hole excavator having a structure in which a screw auger can be attached and detached by a simple operation.

[0007]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 is directed to a side hole drilling apparatus provided with a screw auger for drilling a side hole required when performing piping work under the ground. A grounding table installed in a vertical shaft opening into the ground, a moving table mounted on the grounding table and movable in the excavation direction of the horizontal hole, and rotatably supported by the moving table, the screw auger A chuck mechanism for gripping one end in the longitudinal direction, and first and second drive sources for applying a driving force to the moving table and the chuck mechanism, respectively, wherein the first and second drive sources are hydraulic motors, respectively. The first driving source transmits driving force to the moving table via a feed screw provided on the grounding table, and the second driving source transmits the chuck mechanism via a speed reduction mechanism. Rotational force and is characterized by imparting a gripping force against the screw auger.

According to a second aspect of the present invention, in the lateral hole excavator according to the first aspect, the chuck mechanism includes a swingable holder disposed at a position equally divided in a circumferential direction; A driven gear attached to a moving fulcrum shaft, a non-moving drive gear for transmitting a rotational force to the driven gear, and a chuck mechanism configured to center the drive gear and rotatably support the driven gear. A rotatable carrier member serving as a base portion, wherein the carrier member rotates the driven gear in accordance with the direction in which the rotational force is transmitted from the drive section, and the holding diameter of the screw auger by the holders. It is characterized in that the diameter is reduced or enlarged.

[0009]

According to the first aspect of the present invention, the driving of the movable table in the excavation direction, the rotation of the chuck mechanism, and the gripping force on the screw auger are applied by the chuck mechanism by the rotational driving force of the hydraulic motor. As a result, the propulsion force and the gripping force of the screw auger are improved as compared to before,
Proper propulsion can be realized regardless of the soil quality.

According to the second aspect of the present invention, the rotation of the driven gear with reference to the stationary gear in accordance with the rotation direction in which the chuck mechanism is driven causes the swing fulcrum shaft to be screwed by the holder attached to the driven gear. The screw auger can be attached and detached by reducing or increasing the gripping diameter of the auger. Therefore, it is possible to adapt to various screw auger standards regardless of the diameter of the shaft end portion of the screw auger, and perform an appropriate attaching / detaching operation. Further, by configuring as described above, the end of the existing pipe in the soil can be grasped, and by reversing the propulsion feed, the existing pipe in the soil can be pulled out. Become.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a main part of a lateral hole excavator according to the present invention. The apparatus shown in FIG. 1 employs, as a configuration of the screw auger, a configuration having an ejection hole capable of ejecting fluid in the outer peripheral direction of the lateral hole and in the propulsion direction together with the tip blade. With such a configuration, when the screw auger is propelled hard earthen, the soil is softened by ejecting the fluid in the propulsion direction, and also when the soil is propelled soft sand. In the sand, the sandy soil is compacted by ejecting the fluid in the outer peripheral direction.

In FIG. 1, a horizontal hole excavator 1 includes a grounding table 2, a moving table 3, a chuck mechanism 4, and a screw auger 5.
And first and second driving sources 6 and 7 as main parts. Hereinafter, each member will be described. The grounding table 2 is a member installed inside a shaft (not shown) that opens to the ground, and includes a bed-shaped base, and leveling bolts 8 that can move up and down are provided at four corners of the base. I have. The leveling bolt 8 is for adjusting the position of the grounding table 2 in the vertical direction, and can position a screw auger 5 described later with respect to a position where a horizontal hole is excavated in the shaft. Further, a pair of side plates 2 provided along the longitudinal direction of the screw auger 5 on the grounding table 2.
a is provided with a side leveling bolt 8 ′ that can move forward and backward in a direction corresponding to a direction perpendicular to the levelable bolt 8 that can be raised and lowered. The side leveling bolt 8 ′ is connected to the ground 2 of the screw auger 5 in the shaft.
Is grounded on the vertical wall surface of the shaft facing the side plate 2a, the reaction force when the screw auger 5 is propelled can be received, and the grounding table 2 is maintained in an immobile state.

The moving table 3 is a member that can move on the grounding table 2 in an excavating direction corresponding to the direction in which the screw auger 5 is propelled. The grounding table 2 is provided with a structure for moving the moving table 3, and as shown in FIG. 1, the structure includes a pair of guide rods 9 and guide rods 9 stretched between the side plates 2a. Lead screw 10 located between
It consists of. In FIG. 2, one end of the feed screw 10 in the longitudinal direction is connected to an output shaft of a hydraulic motor 6 as a first drive source via a coupling member (not shown).

As shown in FIG. 1, the movable base 3 is a slidable member through which the guide rod 9 is inserted and further provided with a ball screw (not shown) that meshes with the feed screw 10.
The screw auger 5 can be moved in a propelling direction and a retreating direction in accordance with the rotation direction of the feed screw 10.

On the other hand, a vertical bracket 3
a is fixed, and the speed reduction mechanism 11 is attached to the vertical bracket 3a. The speed reduction mechanism 11 has an output shaft penetrating the vertical bracket 3a, and the input shaft side is provided so as to be interlocked with the output shaft of the hydraulic motor 7 as the second drive source.

The output shaft of the speed reduction mechanism 11 is
Is combined with FIG. 3 is a cross-sectional view of the chuck mechanism 4.
And a support block 13 which can be interlocked with the base 12 which is spline-coupled to the output shaft (part indicated by reference numeral 12S in FIG. 3). The base 12 is provided with mounting bolts 14.
Is pressed against the support block 13 by a ring-shaped support plate 15 fastened to the support block 13 to be integrated therewith. The base 12 has a boss 12a extending on the opposite side to the spline 12S, and an end of the boss 12a is supported by the support block 13. A support member 16 is fitted to the outer periphery of the boss portion 12a in a floating (movable) state with the boss portion 12a, and a stationary gear 17 is fitted to the outer periphery of the support member 16.

The stationary gear 17 is provided with a driven gear 19 via an idle gear 18 so as to be interlocked therewith. The idle gear 18 and the driven gear 19 are rotatably supported around a boss 12 a of the base 12 by a carrier member 21 attached to a support rod 20 fastened to the support block 13. A holder 22 to be described later is fixed to the rotation shaft 19a of the driven gear 19.

As shown in FIG. 4, the holder 22 is a swingable member which is disposed at a position equally divided into three parts in the circumferential direction with respect to the rotation center of the base 12 of the chuck mechanism 4. The fulcrum corresponds to the rotation shaft 19a. The holder 22 has a knurled surface on the surface facing the center of rotation of the base 12 so that the holder 22 can be prevented from slipping when the outer peripheral surface of the screw auger 5 is gripped.

In FIG. 3, the driven gear 19 can roll around the stationary gear 17 in accordance with the rotation of the support block 13 when the base 12 rotates. Rotate in the direction corresponding to the direction. That is, FIG. 5 is a diagram for explaining rotation transmission between the stationary gear 17 and the driven gear 19, and in FIG.
When the base 12 rotates clockwise as shown by the solid line, the rotation is transmitted to the support block 13 (in FIG.
And the support block 13 are shown at the same position). When the support block 13 rotates clockwise, the driven gear 19 rolls around the stationary gear 17 while rotating counterclockwise as indicated by the solid line. Thereby, the rotating shaft 19 of the driven gear 19
a rotates in the same direction as the driven gear 19, and the holder 22
As shown by the solid line, the oscillating member swings counterclockwise around the rotation shaft 19a. Since the holder 22 that swings counterclockwise swings toward the rotation center of the chuck mechanism 4,
The diameter for gripping the screw auger 5 by the chuck mechanism 4 is reduced. Thereby, screw auger 5
Can be firmly gripped by the holder 22.

On the other hand, when the base 12 rotates in the counterclockwise direction shown by the two-dot chain line, the rotation is transmitted to the support block 13. When the support block 13 rotates counterclockwise, the driven gear 19 rolls around the stationary gear 17 while rotating clockwise as indicated by a two-dot chain line. Thereby, the driven gear 1
9 rotates in the same direction as the driven gear 19,
The holder 22 swings clockwise about the rotation shaft 19a as a fulcrum as shown by a two-dot chain line. Since the holder 22 that swings clockwise swings away from the center of rotation of the chuck mechanism 4, the diameter of the screw auger 5 gripped by the chuck mechanism 4 is enlarged. . Accordingly, the gripping force of the screw auger 5 by the chuck mechanism 4 is weakened, and the screw auger 5 can be detached from the chuck mechanism 4. For this reason, when the propulsion of the screw auger 5 is completed, the hydraulic motor 7 serving as the second hydraulic source stops when the rotation of the hydraulic motor 6 serving as the first hydraulic source, which will be described later, is switched. When the auger 5 is mounted, the base 12 is rotated in a counterclockwise direction and a clockwise direction in accordance with a command from an operation unit (not shown) as described with reference to FIG. The idle gear 18 located between the stationary gear 17 and the driven gear 19 is used to position the idle gear 18 at a position where the end of the screw auger 5 can be gripped by the holder 22 fixed to the rotation shaft 19 a of the driven gear 19. Things.

By configuring the chuck mechanism 4 as described above, the diameter that can be gripped by the holder 22 has a certain degree of freedom, and the screw can be gripped regardless of the diameter of the end of the screw auger 5. In addition, since the end of the existing pipe (for example, 20A to 50A) in the soil can also be gripped, the end of the existing pipe is gripped, and the movable base 3 is retracted to pull out the existing pipe. Will be able to

The structure of the screw auger 5 held by the chuck mechanism 4 is shown in FIG. In FIG. 6, the screw auger 5 has a length of about 3
Metal shaft 5 that is set to about 0 to 50 cm and forms the base
1, a metal spiral blade 52 having a required pitch is formed and formed. A male screw portion 53 is formed at a tip portion corresponding to one end in the longitudinal direction of the metal shaft 51,
At the rear end corresponding to the other end in the longitudinal direction, the male screw portion 53 is provided.
A female screw hole 54 is formed to screw with the hole. Further, a fluid passage 5 communicating with the distal end of the male screw portion 53 toward the female screw hole 54 along the longitudinal direction is provided at the center of the metal shaft 51.
5 are provided. The screw auger 5 can be connected in series by screwing the male screw portion 53 and the female screw hole 54, and another connecting shaft may be connected to the subsequent stage of the screw auger 5 to be propelled. The screw augers 5 may be added in series and propelled.

In the screw auger 5 described above, a tip blade 56 is attached via a male screw portion 53 to the tip of the screw auger 5 located at the head. The tip blade 56 is provided with a plurality of radial ejection holes 56a radially drilled from the center toward the outer peripheral surface along the circumferential direction. In addition to the above-mentioned ejection holes 56a, the tip blade 56 is formed with straight ejection holes 56b that open in the longitudinal direction (axial direction) of the screw auger 5, and these ejection holes 56a, 56b It communicates with a fluid passage 55 formed in a metal shaft 51.

The above-mentioned fluid passage 55 is connected to liquid supply means. Although not shown in detail, the above-mentioned liquid supply means is connected to a flow path formed inside the vertical bracket 3a provided in the grounding table 2 and a flow path installed on the ground via a hose or the like. And a liquid supply device. The above-mentioned flow path and the fluid passage 55 are
are connected by a plurality of liquid introduction passages formed radially at the output shaft of the speed reduction mechanism 11 penetrating through a. FIG. 1 shows a pipe 56 connected to the inside of the vertical bracket 3a.

The above-mentioned first and second hydraulic motors 6 and 7
Is a hydraulic supply device installed on the ground (not shown)
The rotation direction and the number of rotations are controlled by this. In other words, a worker operates a control device (not shown) that controls the first and second hydraulic motors 6 and 7 outside the shaft.
, The first hydraulic motor 6 controls the propulsion and retreat of the moving table 3, and the second hydraulic motor 7 operates to rotate the chuck mechanism 4.
This eliminates the need for the operator to operate the horizontal hole excavator 1 in a narrow shaft. In this embodiment, a structure for setting the rotation amount of the hydraulic motor 6 for determining the amount of propulsion of the screw auger 5 is provided. This structure includes a limit switch (not shown) attached to both the side plates 2 a of the grounding table 2 and an actuator (not shown) provided on the movable table 3. When the movable base 3 is moved in the propulsion direction of the screw auger 5 by the rotation of the feed screw 10 (see FIG. 1), when a limit switch provided on one side plate 2a is operated by an actuator located on the movable base 3 side, a hydraulic motor is provided. 6 is stopped. The stopped hydraulic motor 6 rotates in the opposite direction except when the stop is maintained by a command from an operation unit (not shown),
The moving table 3 is moved backward.

The rotation of the hydraulic motor 6 in the reverse direction is continued until the limit switch on the other side plate 2a and the actuator on the movable base 3 interact with each other. When the reverse rotation of the hydraulic motor 6 is stopped, the moving table 3 is positioned at an initial position where the screw auger 5 can be mounted on the chuck mechanism 4. The movement of the movable base 3 from the initial position is started by a command from an operation unit (not shown). The initial position of the moving table 3 is a position indicated by a solid line in FIG. 2, and a retreat start position of the moving table 3 is a position indicated by a two-dot chain line in FIG. The retreat start position of the moving table 3 is a position where the support block 13 of the chuck mechanism 4 can approach the vertical wall of the shaft well most, and corresponds to a position where the amount of propulsion of the screw auger 5 becomes maximum. are doing.

In addition, the hydraulic motor 6, which is the first hydraulic pressure source, is provided with a device for ejecting liquid from the screw auger 5. This device uses a sensor (not shown) for detecting the moving speed of the movable base 3 at a predetermined number of rotations set in the hydraulic motor 6.
The moving speed detection sensor detects a change in the moving speed of the moving base 3 corresponding to the propulsion speed due to the soil propelled by the screw auger 5. When the screw auger 5 is propelling a special stratum such as hard earthen or sandy soft soil, the propulsion speed by the predetermined rotation is different from the case where the screw auger 5 is propelling another stratum. For example, when propelling hard earthen, the moving speed of the moving base 3 tends to be slow, and when propelling in sandy soil, the moving speed of the moving base 3 tends to increase. Therefore, in the present embodiment, the rotation speed of the hydraulic motor 6 is set to a rotation speed on the assumption that the special stratum is propelled, and the movement speed detection sensor is set based on the movement speed of the movable base 3 based on the rotation speed. The change of the moving speed of the moving base 3 due to is detected. As the above-mentioned moving speed detecting sensor, for example, a structure capable of detecting a change in inertial force is used, and when it is detected that the moving speed of the moving base 3 has changed, the screw auger 5 is detected.
A process for ejecting a fluid from the inside is performed.

Since the present embodiment has the above configuration,
When excavating a horizontal hole, the horizontal hole excavation measure 1 is installed in a vertical shaft. The horizontal hole excavator 1 installed in the shaft is moved by moving the leveling bolt 8 and the side-leveling bolt 8 ′ of the grounding table 2 to position the grounding table 2 in the height direction and the longitudinal direction of the screw auger 5. It is held stationary in parallel directions. The screw auger 5 is mounted on the chuck mechanism 4 of the lateral hole excavator 1 that has been positioned in the height direction. Screw auger 5
The one corresponding to the first stage having the tip blade 56 is attached to the chuck mechanism 4.

The chuck mechanism 4 on which the screw auger 5 is mounted is rotated by a hydraulic motor 7 as a second drive source in a direction in which the holder 22 can swing away from the center of rotation of the chuck mechanism 22. Is done.
The rotation direction of the chuck mechanism 4 at this time corresponds to the rotation of the base 12 in the counterclockwise direction, as indicated by the two-dot chain line in FIG. When the holder 22 swings away from the center of rotation of the chuck mechanism 4 and the screw auger 5 can be mounted, an end of the screw auger 5 is inserted into the chuck mechanism 4. After the end of the screw auger 5 is inserted, the chuck mechanism 4 is rotationally driven in a direction opposite to that before the hydraulic motor 7 as the second drive source mounts the screw auger 5. The rotation direction of the chuck mechanism 4 at this time corresponds to the clockwise rotation of the base 12 as shown by the solid line in FIG. When the base 12 is rotated clockwise, the holder 22 swings in the direction of gripping the screw auger 5 and can grip the end of the screw auger 5.

When the screw auger 5 is mounted, the hydraulic motor 7 serving as the second drive source rotates in a direction in which a horizontal hole can be excavated by the spiral blade 52 of the screw auger 5,
The chuck mechanism 4 is linked.

When the screw auger 5 starts rotating,
The moving table 3 is driven by a hydraulic motor 6 as a first hydraulic source. In this case, the rotation direction of the hydraulic motor 6 corresponds to the direction in which the movable base 3 can be propelled. When the moving table 3 moves in the direction in which the screw auger 5 is propelled, the screw auger 5 that has already started to rotate enters the soil and can advance while excavating.

During the propulsion of the screw auger 5,
Until the actuator of the movable base 3 operates the limit switch provided on the side plate 2a, the fluid ejection control by the screw auger 5 is performed in accordance with the result of the detection of the travel speed by the travel speed detection sensor provided in the movable base 3. When the screw auger 5 is propelled by a hydraulic motor 6 serving as a first hydraulic source and the actuator is operated by a limit switch, the hydraulic motor 6 serving as a first hydraulic source is driven.
Starts rotating in the direction opposite to the rotation direction up to that point, moves the moving table 3 backward, and returns the moving table 3 to the initial position. When the carriage 3 is returned to the initial position, the screw auger 5 is removed from the chuck mechanism 4 and the screw auger 5 at the next stage is connected to the chuck auger 4 again.
Attached to. In this case, the attachment / detachment operation of the screw auger 5 is performed by switching the rotation direction of the chuck mechanism 4 to the direction described in FIG. When the screw auger 5 of the next stage is mounted on the chuck mechanism 4, the hydraulic motors 6 and 7, which are the first and second drive sources, respectively, resume rotation, and the screw auger 5 is propelled again, Continuous side hole excavation is performed.

[0033]

As described above, according to the first aspect of the present invention, the propulsion and detachment of the screw auger are performed by the hydraulic motor, so that the propulsion control and detachment operation of the screw auger require a great deal of labor. It can be implemented without need. In addition, the use of a hydraulic motor makes it possible to reduce the size and quietness of the device.

According to the second aspect of the present invention, the screw auger can be attached and detached only by controlling the rotation direction of the chuck mechanism which is rotationally driven by the hydraulic motor. And can be convenient. Moreover, while the chuck mechanism is rotationally driven by the hydraulic motor, the gripping force on the screw auger by the chuck mechanism can be continuously applied, so that the screw auger is securely prevented from falling off, and furthermore, the soil is removed. The sliding of the screw auger by the chuck mechanism due to the propulsion resistance received by the screw auger during propulsion can be reliably prevented. If the screw auger slides with respect to the chuck mechanism, smooth excavation cannot be performed. However, according to the invention described in claim 2, such a problem can be reliably prevented. Furthermore, regardless of the diameter of the shaft end of the screw auger, it can be adapted to various screw auger standards and can be properly attached and detached, so it is possible to grip the end of the existing pipe in the soil. By reversing the propulsion feed, existing pipes in the soil can be pulled out.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a lateral hole excavator for explaining an embodiment of the present invention.

FIG. 2 is a side view of the side hole excavator shown in FIG.

FIG. 3 is a cross-sectional view showing a structure of a chuck mechanism used in the lateral hole excavator shown in FIG.

FIG. 4 is a front view of the chuck mechanism for explaining a configuration of a holder provided in the chuck mechanism shown in FIG. 3;

FIG. 5 is a schematic diagram for explaining a power transmission path in the chuck mechanism shown in FIG. 3;

FIG. 6 is a cross-sectional view illustrating a structure of a screw auger used in the lateral hole excavator shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side-hole excavation apparatus 2 Grounding stand 2a Side plate 3 Moving table 4 Chuck mechanism 5 Screw auger 6 Hydraulic motor which is the 1st drive source 7 Hydraulic motor which is the 2nd drive source 10 Feed screw 11 Reduction mechanism 12 Base which chuck mechanism has 13 Support Block of Chuck Mechanism 17 Stationary Gear 19 Follower Gear 22 Holder

Claims (2)

(57) [Claims] 1. A horizontal hole excavator having a screw auger for excavating a horizontal hole required for piping work under the ground, comprising: a grounding stand installed in a vertical shaft opening into the ground; A movable table mounted and movable in the excavation direction of the lateral hole, a chuck mechanism rotatably supported by the movable table and gripping one longitudinal end of the screw auger, and a movable table and the chuck mechanism, respectively. A first and a second drive source for applying a driving force, wherein the first and second drive sources are each configured by a hydraulic motor, and the first drive source is provided on the ground stand. A driving force is transmitted to the movable table via a feed screw, and the second driving source applies a rotational force and a gripping force to the screw auger to the chuck mechanism via a speed reduction mechanism. Lateral hole drilling apparatus characterized by. 2. The side hole excavator according to claim 1, wherein the chuck mechanism is mounted on a swingable holder disposed at a position equally divided in a circumferential direction, and mounted on a swing fulcrum shaft of the holder. A driven gear that transmits a rotational force to the driven gear; a drive gear that is positioned at the center of the drive gear, rotatably supports the driven gear, and rotatably forms a base of the chuck mechanism. The carrier member rotates the driven gear in accordance with the direction in which the rotational force is transmitted from the drive unit, and reduces or increases the gripping diameter of the screw auger between the holders. A side-hole drilling device characterized by the above-mentioned.