JPH063249Y2 - Extruder pusher - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to an original pushing device for a punching machine, and more particularly to an original pushing device for a punching machine used for civil engineering such as burying electric wires.

[Prior Art] With the progress of the advanced information society, the undergrounding work of the communication cable for constructing the communication network is increasing. Since these works need to be carried out without hindering the above-ground structures and road works, and at the lowest possible cost, use a non-excavation method and use a small drilling machine that excavates horizontally from the vertical shaft. It is designed to drill pilot holes.

Among these punches, a machine for punching a soft cohesive soil layer or the like only needs to press-fit a pilot pipe, so various small machines have been proposed and are currently in use as press-fitting punches. However, in order to drill a large-diameter pilot hole in consideration of all soil properties, it is necessary to use a punching machine provided with an original pushing device composed of a rotating mechanism and a long-stroke jack.

As shown in FIGS. 4 and 5, the conventional pusher device of this type of punching machine has an outer pipe 2 and an inner pipe 3 (pilot pipes) that are added to a double pipe body 1 that digs into the ground G. Is mainly constituted by a swivel 4 for appropriately holding the swivel 4, jacks 5 and 6 for pushing the swivel 4 in the excavation direction A, and rotary motors 7 and 8 for giving the swivel 4 a rotational force required for excavation. There is.

The double pipe body 1 referred to here is a cutter portion (not shown) having an excavating bit at its tip or an outer pipe and an inner pipe already connected to this cutter portion, and the swivel 4 inserts them. It has a double structure that can be held separately. The outer pipe portion 9 of the swivel 4 is a jack 5 and a rotation motor 7 for driving the outer pipe 2, and the inner pipe portion 10 thereof is a jack 6 and a rotation motor 8 for driving the inner pipe 3.
, And are contacted separately.

An excavator-type drilling machine is provided with an operation panel (not shown), a hydraulic pressure supply unit connected to the jacks 5 and 6, a support jack for radially supporting the outer pipe 2 during excavation, and a muddy water supply device. There is. Among them, the muddy water supply device is adapted to supply muddy water (stabilizing liquid) for stabilizing the hole wall and discharging the excavated earth and sand to the original pushing device. , 3 is circulated between the tip and the tip of the cutter portion to form a pilot hole having a desired length.

[Problems to be Solved by the Invention] By the way, in the above-described conventional pusher, the jacks 5 and 6 are provided in parallel with the swivel 4, and the outer tube 2 is provided.
The jack 5 for the swivel 4 includes the rotary motors 7 and 8.
It is designed to be moved in its entirety. For this reason, a large-scale device is required, the manufacturing cost is high, and the starting shaft H for installing the original pushing device is inevitably large, resulting in an excessively large construction space. was there.

Further, since the lengths of the outer pipe 2 and the inner pipe 3 are limited by the stroke lengths of the jacks 5, 6, the jacks 5, 5
If 6 is shortened to save space, additional work must be performed many times during excavation, which may lead to an increase in construction man-hours and an extension of construction period.

Therefore, in view of the above circumstances, the present invention was devised to provide a space-saving original pushing device for a punching machine.

[Means for Solving the Problems] The present invention provides a piston that holds an outer pipe and an inner pipe that are added to a double pipe body that is dug in the ground, and a piston that accommodates the piston and pushes it in the dug direction. For defining a working fluid chamber for the purpose, inner pipe rotating means for engaging the piston to transmit the excavation rotational force to the inner pipe, and engaging the cylinder for transmitting the excavation rotational force to the outer pipe And an outer tube rotating means for rotating the outer tube.

Further, the cylinder may be configured to have a muddy water chamber for separating muddy water from the working fluid chamber by the piston and for pumping muddy water into the double pipe body via the outer pipe.

[Operation] With the above configuration, when the working fluid is supplied to the working fluid chamber in the cylinder, the piston generates a predetermined pushing force to move the outer pipe and the inner pipe in the excavation direction. On the other hand, the inner pipe rotating means rotates the piston to transmit the rotational force capable of excavating to the inner pipe held by the piston. Then, the outer tube rotating means rotates the cylinder, thereby rotating the outer tube accommodated inside thereof through the piston.

Further, in the configuration in which the cylinder has the muddy chamber, the muddy water is pumped with the pushing of the piston, and when the supply of the working fluid is stopped, the pressure of the muddy water causes the piston to move backward in the digging direction. To move.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment of an original pushing device for a punching machine according to the present invention. The same components as those of the conventional one are designated by the same reference numerals, and the description thereof will be omitted.

This original pushing device includes a piston 21 that holds an outer pipe 2 and an inner pipe 3 that are added to the double pipe body 1, and a piston 21 that holds the outer pipe 2 and the inner pipe 3.
A cylinder 23 defining a working fluid chamber 22 for accommodating 1 and pushing it in the excavation direction A, and an inner pipe rotating means for engaging the piston 21 and transmitting the excavation rotational force to the inner pipe 3. 24 and an outer pipe rotating means 25 for engaging with the cylinder 23 and transmitting the excavation rotational force to the outer pipe 2.

The piston 21 is composed of an oval plate portion 26 having an oval shape and a tubular portion 27 having a diameter smaller than that of the elliptic disk portion 26. The tubular portion 27 is screwed with a female screw portion 28 formed at one end of the outer tube 2. The male screw 29 to be fitted is formed. And in the oval plate portion 26,
Extension rod 3 extended to a predetermined length outward in the axial direction
0 is provided. The extension rod 30 has a piston 21.
Is rotatably supported around the shaft center of the
The concave surface 31 formed by being recessed inside 9 is formed with an external thread 33 that is axially fixed and that is screwed into the internal thread 3 of the inner tube 3. That is, this piston 21 has the function of the swivel 4 in the case of the conventional source pushing device of FIG.

The cylinder 23 includes a side plate 34 that slides in close contact with the outer edge of the elliptical plate portion 26, a rear plate 36 having a through hole 35 through which the extension rod 30 penetrates, a tubular portion 27, and an outer tube held by this. 2 and a front plate 38 having a guide hole 37 through which 2 passes. That is, it has a bottomed cylindrical shape with an oval cross section. Further, the length of the side plate 34 is formed to be larger than the lengths of the outer pipe 2 and the inner pipe 3 to be replenished.

The working fluid chamber 22 is formed between the elliptical plate portion 26 and the rear plate 35, and the rear plate 35 is provided with an oil hole 39 to supply a hydraulic fluid as a working fluid. It is designed to communicate with (not shown). That is, with the piston 21 and the cylinder 23, the jack 5 of FIG.
It has 6 configurations.

In the present embodiment, the cylinder 23 defines a muddy water chamber 40 separated from the working fluid chamber 22 by the piston 21. That is, the excavation direction A of the piston 21
Muddy water is guided to the front side, and a muddy water hole 41 for communicating with a muddy water supply pump (not shown) is formed near the front plate 38 of the side plate 34. And the tubular portion 2
A communication hole 42 communicating from the muddy water chamber 40 to the concave surface 31 is formed in the muffler 7, and the muddy water is fed into the outer pipe 2.

The inner tube rotating means 24 includes an inner tube rotating motor 43 and a speed increasing gear 44 connected to the motor 43. By connecting the extension rod 30 to the shaft center of the large gear 45 of the speed increasing gear 44 by key connection, It is designed to give a predetermined rotation.

The outer tube rotating means 25 is composed of an outer tube rotating motor 46 and a speed increasing gear 47 connected thereto. As shown in FIG. 2, the large gear 48 of the speed increasing gear 47 is formed such that its rotation axis B coincides with the axis of the cylinder 23 and is fitted to the outer edge of the cylinder 23. Are combined. That is, when the cylinder 23 is rotated by the large gear 48, the piston 21 and the outer tube 2 housed inside the cylinder 23 rotate around the rotation axis B.

In addition, a swivel joint 49 is provided at the end of the extension rod 30 so as to collect the muddy water that has returned via the inner pipe 3. The guide hole 37, the through hole 35, and the outer edge of the elliptical plate portion 26 are sealed so that oil and muddy water do not leak.

Next, the operation of this embodiment will be described.

First, the outer pipe 2 and the inner pipe 3 which are added to the existing outer pipe 50 and the inner pipe 51 which are the double pipe body 1 are inserted into the cylinder 23 through the guide hole 37 and are held by the cylinder portion 27 of the piston 21. . At this time, the outer tube 2 and the inner tube 3 are respectively screw-connected to the outer circumference of the tubular portion 27, which is the screwing position, and the extension rod 30 inside thereof.

Then, the inner tube rotating means 24 is driven to drive the extension rod 3
The outer tube 2 and the inner tube 3 are rotated by rotating 0 and driving the outer tube rotating means 25 to rotate the cylinder 23 and the piston 21. At the same time, the working fluid chamber 22
The oil having a predetermined pressure is supplied to the piston 21, and the piston 21 is moved in the excavation direction A until the existing outer pipe 50 and inner pipe 51 and the held outer pipe 2 and inner pipe 3 are connected to each other.

When the connection is completed, muddy water is injected into the muddy water chamber 40 to further supply hydraulic pressure to the working fluid chamber 22. The piston 21 increases the pressure according to the cross-sectional area ratio between the elliptical plate portion 26 and the cylinder portion 27, and pushes the outer pipe 2 and the inner pipe 3 in the excavation direction A. At this time, the muddy water in the muddy water chamber 40 is compressed to increase its flow velocity. That is, the muddy water is sent from the communication hole 42 between the outer pipe 2 and the inner pipe 3 to the cutter portion, as shown by the arrow a in FIG. 1, to stabilize the hole wall formed by excavation. After that, it flows in the opposite direction in the inner space 3 along with the excavated earth and sand, and is discharged to the outside of the former pushing device.

When the excavation proceeds and the length of the added outer pipe 2 (inner pipe 3) is dug, the hydraulic pressure is stopped at that time, and the cylinder 23 and the extension rod 30 are rotated in the reverse direction, and the ground G
The edges of the outer tube 2 and the inner tube 3 that have entered the inside are cut off. At this time, the muddy water is discharged from the guide hole 37 to the outside of the cylinder 23, but the pressure in the muddy water chamber 40 is raised by the passage resistance at that time to be higher than that in the working fluid chamber 22, and the piston 21
Are moved backward in the excavation direction A. And piston 21
However, after returning to a position where the outer pipe 2 and the inner pipe 3 can be replenished, the supply of muddy water is stopped and the next replenishment is performed.

As described above, since the pushing force for excavating the outer pipe 2 and the inner pipe 3 is obtained by driving the piston 21 and the cylinder 23, the conventional long jack becomes unnecessary, and a large saving is achieved. Space is achieved. Particularly, it is effective when forming a pilot hole having a large hole diameter (about 100 to 200 mm). Further, in addition to the piston 21 and the cylinder 23, rotating means 24 for giving a rotational force,
Since 25 also has a simple structure, the manufacturing cost can be reduced.

During excavation, the outer pipe 2 and the inner pipe 3 are supported by the front plate 38 of the cylinder 23 in the radial direction,
The conventional support jack is also unnecessary.

In addition, because I tried to apply pressure to the mud along with the excavation,
A pump or the like for supplying muddy water can be simplified, and the piston 21 can be retracted smoothly and easily.

Although the cross-sectional shape of the cylinder 23 is oval, any shape other than a perfect circle may be used as long as the piston 21 can be constrained in the rotational direction, for example, a prismatic shape. In this case, of course, the shape of the piston is changed so that it can slide. Further, since the main purpose of the shape of the cylinder 23 is to transmit the rotation to the outer tube 2, various configurations for the transmission can be considered, and the piston and the cylinder are slidable by a spline structure. Alternatively, it is conceivable that the front plate 38 is provided with chuck means for holding the outer tube 2.

Next, a concrete example will be described with reference to FIG.

In this specific example, a case is shown in which the punching machine having the original pushing device 61 shown in FIG. 1 is installed in the starting shaft 62. Then, the lifting device 6 is installed in the starting shaft 62.
3 is provided so that the former pushing device 61 can be moved from the lower surface of the starting shaft 62 to the ground.

Therefore, the worker can set the outer pipe 2 and the inner pipe 3 to be added to the piston 21 on the ground, and if the operation panel 64 and the like are placed on the ground, there is no need to enter the vertical shaft 62, which is a work safety. It is possible to automate excavation work as well as improving the efficiency.

Other configurations and effects are similar to those of the above-described embodiment, and therefore the description thereof is omitted.

Further, although this embodiment is applied to the single-step excavation as shown in FIG. 3, a force is applied backward in the excavation direction A such as adding a step of pulling out the outer pipe and the inner pipe used for the excavation. Even if is required, it can be applied by slightly changing the configuration of the piston.

[Effects of the Invention] In short, according to the present invention, the following excellent effects are exhibited.

(1) A piston that holds the outer pipe and the inner pipe, respectively, a cylinder that pushes the piston in the digging direction, an inner pipe rotating means that engages with the piston, and an outer pipe rotating means that engages with the cylinder are provided. Therefore, the punching machine is downsized, and the manufacturing cost is reduced and the space is saved.

(2) Further, in the configuration in which the cylinder has a muddy water chamber separated from the working fluid chamber by the piston,
The mechanism for supplying muddy water can be simplified.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an original pushing device of a punching machine according to the present invention, FIG. 2 is a schematic perspective view showing the relationship between the cylinder and the outer tube rotating means, and FIG. FIG. 4 is a side view showing a specific embodiment, FIG. 4 is a plan view of a main part of a conventional pushing device for a punching machine, and FIG. 5 is a side view thereof. In the figure, 1 is a double tube, 2 is an outer tube, 3 is an inner tube, 21 is a piston, 22 is a working fluid chamber, 23 is a cylinder, 24 is an outer tube rotating means, 25 is an inner tube rotating means, and 40 is It is a muddy room.

Claims (2)

[Scope of utility model registration request] 1. A piston for holding an outer pipe and an inner pipe, which are added to a double pipe body for excavating in the ground, and a working fluid chamber for accommodating the piston and for pushing in the excavating direction. A cylinder, an inner pipe rotating means for engaging the piston and transmitting the excavating rotational force to the inner pipe, and an outer pipe rotating means for engaging the cylinder and transmitting the excavating rotational force to the outer pipe. An original pushing device for a punching machine, comprising: 2. The perforation according to claim 1, wherein the cylinder has a muddy water chamber which is separated from the working fluid chamber by the piston and which pumps muddy water into the double pipe body through the outer pipe. Machine pusher.