JPH0213596Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a method of excavating a vertical hole from the ground and then constructing relatively small diameter pipes such as gas pipes, water pipes, signal line accommodation pipes, etc. from the bottom of the vertical hole. This invention relates to a fixed chuck device for gripping the gripping part of a preceding screw auger when adding and disassembling the screw auger in a horizontal hole excavation device used when excavating a horizontal hole underground with a replenishing type screw auger.

(Conventional technology) When constructing a new gas pipe that branches off from an existing gas pipe buried underground along a road and supplies gas to a target such as a residence, conventionally it is difficult for people to enter the pipe. A vertical hole with a diameter of approximately 1 m for connecting a new gas pipe is excavated from the ground to the depth where the existing gas pipe is buried, and from the vertical hole to the premises to be supplied (in many cases, the road is After the new gas pipe is buried, a trench is dug for the new gas pipe to be buried, and after the new gas pipe is buried, the trench or vertical hole is filled in for temporary restoration, and then the main restoration is carried out several days or more than 10 days later. There is. For this reason, there are problems in that the construction period, labor and cost are increased, and furthermore, road traffic is hindered.

Therefore, the inventors of the present invention believe that after construction of a new gas pipe,
A vertical hole with a smaller cross-sectional area than before that reaches from the ground to the existing gas pipe will be constructed so that the main restoration can be carried out immediately without the need for temporary restoration, that is, the damage to the road caused by the work will be minimal. While digging, push and fit the casing into the vertical hole,
An elevating frame is mounted on the elevating frame, which is positioned on guide means provided vertically on the inner wall of the casing and is raised and lowered by an elevating device. A lateral hole drilling device equipped with a rotary drive device, a traverse device, and a rotating and fixed chuck device. It is already being developed.

When performing automatic excavation with such a horizontal hole digging device, in order to vertically add and disassemble the screw auger A at the bottom of the vertical hole, the fixed chuck device that grips the gripping portion C of the preceding screw auger A must be attached to the screw auger A. Positioning accuracy is required so that the axial center of the U-Auger A precisely matches the axial center of the following Screw Auger. Therefore, the position of the gripping part C of the preceding screw auger is controlled by regulating the most closed position of one gripping claw and by making the gripping force of the other gripping claw smaller than that of the one gripping claw. Accurate settings are made. However, because there are multiple diameters for gas pipes, etc., it is necessary to disassemble the fixed chuck device, replace the gripping claws, and reassemble it each time a pipe of a different diameter is installed, which is time-consuming and time-consuming.
Another problem was that it was troublesome.

(Problems to be Solved by the Invention) The present invention is a device that excavates a horizontal hole using a supplementary screw auger at the bottom of a vertical hole. It is intended to provide a check device.

(Means for Solving the Problems) The fixed chuck device of the present invention includes a pair of movable bodies that are attached to the left and right sides of a screw auger so that they can be opened and closed freely by cylinders, and mutually opposing portions of each movable body. It is characterized by detachably providing a shim for adjusting the interval between the gripping claws, which is interposed between the gripping claws attached to the respective gripping claws.

(Example) The details of the present invention will be explained below with reference to FIGS. 1 to 4, taking as an example horizontal hole excavation for constructing a new gas pipe. First, the outline of the horizontal hole excavation device will be explained with reference to FIG. B is an existing gas pipe buried underground under the road, C is a vertical hole drilled to a depth from the ground to the existing gas pipe B, 1a, 1
b is a casing fitted into the vertical hole C;

Reference numeral 2 denotes an elevating frame consisting of a gate-shaped support frame 3 and a guide frame 4 attached to the support frame.
Guide rollers 6 are attached to the upper and lower portions of each of the casings 1a and 1b to roll along guide rails 5 that are vertically fixed to opposing positions on the inner walls of the casings 1a and 1b. Reference numeral 34 denotes a winch shown as an example of a means for raising and lowering the elevating frame 2. The winch 34 is mounted on the frame 33 installed on the casing 1b, and the wire rope 51 wound and let out by this winch is It is wrapped around a sheave 52 attached to the upper frame 3c of the frame 3.

As shown in FIGS. 1 and 2, the guide frame 4 is oriented with respect to the support frame 3 in a direction perpendicular to the direction in which the guide rails 5 and 5 face each other, that is, the casing 1a
The screw auger A is installed almost horizontally toward the insertion opening 9, which is a vertically elongated notch provided at the bottom of the guide frame 4. It is set up.

7 is a rotation drive device for the screw auger A, and the rotation drive device 7 is composed of a hydraulic motor 7a for rotating the screw auger A, and a rotary chuck device 7b for gripping the grip portion c of the screw auger A. Guide rollers 11 are attached to the four corners of the lower surface of the rotary drive device 7, and the grooves provided on the outer periphery of the guide rollers 11 are fitted into the guide rail 10, so that the rotary drive device 7 is connected to the guide rail 10. It is thus positioned and movable.
The fixed chuck device 7b has a plurality of claws 7c arranged to be slidable in a radial direction for gripping the gripping portion c,
It is constructed so that a pawl 7c is opened and closed by a hydraulic cylinder.

On the guide frame 4, there is a traverse hydraulic motor 12 for traversing the rotary drive device 7.
As shown in FIG. 2, a sprocket 13a is attached to the output shaft of the reducer 19. A chain 14 is routed around the attached sprocket 13b, a chain 15 is routed around a sprocket 13c attached coaxially with the sprocket 13b, and a sprocket 13d attached to the rear of the guide frame 4, and the chain 15 is attached to the rotary drive device 7. By connecting to a connecting portion 17 provided on the side and operating a hydraulic motor 12, the rotary drive device 7 is configured to move laterally along the guide rail 10.

Next, the fixed chuck device 24 which is the main part of the present invention
I will explain about it. A fixed chuck device 24 for adding the screw auger A is attached to the front end of the guide frame 4. The fixed chuck device 24, as shown in FIGS. 1 and 2,
Pin 3 on each tube side of guide frame 4
A pair of left and right hydraulic cylinders (pneumatic cylinders may also be used) 30, 31 connected by 5, 36 are attached to the guide frame 4 so as to be rotatable about pins 37, 38, respectively, and one end is attached to each of the hydraulic cylinders 30, 38. Pin 3 on piston rod 31
Links 21 and 22 connected by 9 and 40,
Guide frames 41 and 4 are located on the left and right sides of the screw auger A and are mounted on the guide frame 4 so as to be substantially perpendicular to the screw auger A.
2, movable bodies 45 and 46 slidably mounted on the guide frames 41 and 42, respectively, and elongated holes 21a fixed to the ends of the respective movable bodies and provided at the tips of the links 21 and 22, Connecting pins 47, 48 slidably inserted into 22a and movable bodies 45, 46
Gripping claws 26, 27 are attached by means such as inserting attachment rods 26a, 27a provided on the back side into cut holes 45a, 46a provided on opposite sides of the
is fixed to one of the gripping claws 26 and comes into contact with the end surface of the guide frame 41, so that the gripping claw 2
The stopper 28 is attached and detached by set screws 49 and 50 so as to be interposed between the gripping claws 26 and 27 and the movable bodies 45 and 46, respectively, to define the position in the closing direction of 6, that is, the most closed position. It consists of shims 43 and 44 that can be attached freely, and each shim has a slit 44a through which the attachment rod 27a of the gripping claw 27 passes, and a set screw 50, as shown in FIG. 6 for one shim 44. The upper surface of the movable body 46 has a screw hole 46b into which a set screw 50 is screwed.

Furthermore, by forming the hydraulic cylinder 30 on the side that operates the gripping pawl 26 provided with the stopper 28 with a larger diameter (D1>D2) than the other hydraulic cylinder 31, the gripping claw 26 on the side provided with the stopper 28 is formed to have a larger diameter (D1>D2). The opening/closing force acting on the gripping claw 26 is larger than the opening/closing force acting on the other gripping claw 27. In addition, as a means to make the opening/closing force of the left and right gripping claws 26 and 27 larger than that of the other gripping claw, other means such as changing the configuration of the link mechanism or applying a spring force can be used. can also be adopted.
51 is a cylindrical body attached to the opening of the casing 1a to prevent the inlet portion of the screw auger A from collapsing.

In this configuration, the hydraulic cylinders 30 and 31 are contracted during horizontal hole excavation. At this time, the movement of the piston rods of the hydraulic cylinders 30 and 31 is controlled by the gripping claws 26 and 26 through the links 21 and 22, respectively.
27, the gripping claws 26 and 27 are in the open position as shown by the two-dot chain line in FIG.
6 and 27 do not contact the screw auger A.

When adding and disassembling the trailing screw auger A' to the leading screw auger A,
The hydraulic cylinders 30 and 31 are extended, thereby closing the gripping claws 26 and 27 and gripping the preceding screw auger gripping part c. In this case, the stopper 28 fixed to the guide frame 41 is brought into pressure contact with the end face of the link 21, and the gripping part c is gripped between the opposing gripping claw 27. Since the pressing force acting on the gripping part c from the hydraulic cylinder 31 is larger than the pressing force acting on the gripping part c from the gripping claw 27 by the hydraulic cylinder 31,
When replenishing, the gripping portion c of the preceding screw auger A is always at a constant position. Therefore, while the gripping portion c of the trailing screw auger A' is gripped by the rotary chuck device 7b, and the hydraulic motor 7a is
is activated to rotate the screw auger A' in the excavation direction (during vertical addition) or in the opposite direction to excavation (during disassembly), and further to move the hydraulic motor 12 for traversing forward (during vertical addition) or backward (during disassembly). ) by moving the rotary drive device 7 forward or backward at a very slow speed, the internal thread b of the grip c of the leading screw auger A and the male thread a of the tip of the trailing screw auger A' Screw them together or unscrew them.

In the present invention, as shown in FIG. 4, when excavating with a screw auger having a small diameter of the gripping part c as shown by d, the movable bodies 45, 46
By interposing shims 43 and 44 between the gripping claws 26 and 27, and removing the shims 43 and 44 when the diameter of the gripping part c is large as shown by D,
In either case, it is possible to set the axis so that it is at the same position. In this example,
Since shims 43 and 44 are L-shaped, shim 4
If 3, 44 are not needed, double-dotted chain lines 43', 4
As shown by 4', it can be fixed with set screws 49, 50 at a position that does not interfere with the gripping claws 26, 27, which is advantageous in terms of parts management.

In addition, in the present invention, by preparing shims 43 and 44 of various thicknesses,
Screw augers of various diameters can be used.

(Effect of the invention) In the present invention, by interposing shims between each gripping claw and the movable body to which each gripping claw is attached, the gripping claw can be adjusted in response to changes in the diameter of the screw auger. Since the spacing between the claws can be adjusted, there is no need to disassemble and reassemble the fixed chuck device each time the diameter changes, and all you have to do is attach and detach the shims, making it easy to adjust to changes in the diameter of the screw auger. can correspond to

[Brief explanation of drawings]

Fig. 1 is a front view of the main parts of a horizontal hole excavation device showing an embodiment of the fixed chuck device of the present invention, Fig. 2 is a plan view thereof, and Fig. 3 shows the entire side hole excavation device in the digging state. 4 is a front view illustrating the operation of the present invention, FIG. 5 is a side view showing an example of a screw auger to which the present invention is applied, and FIG. 6 is a shim mounting structure of the present invention. FIG.

Claims (1)

[Scope of utility model registration request] In a device that excavates a horizontal hole using a supplementary screw auger at the bottom of a vertical hole, it is attached to the front of an elevating frame that moves up and down along the vertical hole, and is used to grasp the preceding screw auger when adding and disassembling the screw auger. It is a fixed chuck device for gripping parts, and includes a pair of movable bodies attached to the left and right sides of the screw auger so that they can be opened and closed freely by cylinders, and gripping claws attached to mutually opposing parts of each movable body. and a shim for adjusting the interval between the gripping claws, which is removably interposed between each gripping claw and a movable body to which each gripping claw is attached.