JPS61126290A - Screw auger of horizontal hole apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for installing horizontal holes while repeatedly adding a screw auger, for example, in order to install gas pipes, water pipes, and various other types of piping and linear objects. This invention relates to a screw auger in a horizontal hole digging device for digging.

(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. Possible diameter 1m
A vertical hole for connecting new gas pipes will be excavated from the ground to the depth where the existing gas pipes are buried.
A trench is dug for the new gas installation and management facility from the vertical hole to the premises to be supplied (in many cases, it crosses the road), and after the new gas installation and management installation is completed, the trench and vertical hole are filled in for temporary restoration.
The main restoration work is carried out several days or even several days later, which increases the construction period, labor and cost, and also causes problems in road traffic.

Therefore, the inventors of the present invention have designed a system in which, after construction of new gas pipes, the main restoration can be carried out immediately without the need for temporary restoration, that is, in order to minimize damage to the road caused by the work. A horizontal hole excavation device that excavates a vertical hole with a smaller cross-sectional area than conventional ones to reach the existing pipe, press-fits a casing into the vertical hole, is positioned by guide means provided vertically on the inner wall of the casing, and is lifted and lowered by a lifting device. Attach the screw auger to the rotary chuck device, rotate the screw auger with the horizontal hole excavation device, and excavate the horizontal hole while moving the screw auger forward until the screw auger is buried in the ground except for the rear end. , the horizontal hole digging device is pulled up, a new screw auger is attached to the rotary chuck device on the ground, the horizontal hole digging device is lowered again to the bottom of the vertical hole, and at the bottom, the front part of the horizontal hole digging device is removed by remote control. The fixed chuck device installed at the front grips the gripping portion of the leading screw auger, while the trailing screw auger is gripped by the rotary chuck device and is rotated and moved forward. The screw auger in the row is joined by screwing the male thread at the tip to the female thread provided in the grip part of the preceding screw auger, and then the preceding screw auger is released from being fixed by the fixing chuck device. By repeating the operation of restarting excavation, a horizontal hole for inserting a new gas pipe is excavated (in other words, the size of the vertical hole is smaller than before, and the conventional construction of a trench for managing new gas pipes is no longer required). We are developing a device that will become

In such a device, when the screw auger is attached to the screw auger and the screw auger is separated after excavation, when the screw auger is gripped by the fixed and rotating chuck device, the screw auger is attached to the chuck device in the axial or rotational direction. If they slip relative to each other, they will join and cannot be separated. On the other hand, if the gripping force of the screw auger by the chuck device is increased in order to reliably grip the screw auger with the chuck device, the screw auger and the chuck device become easily damaged, and the chuck device becomes large-scale.

The dimensions and weight of the horizontal hole excavation device also increase, making it impossible to move up and down inside a small vertical hole, and the output of the lifting device must also be increased.

(Problems to be Solved by the Invention) In view of the above points, the present invention provides a horizontal hole excavation device in which the chuck device and the gripping portion do not slip relative to each other when the screw auger is connected and separated. An object of the present invention is to provide a screw auger having a structure of a gripping part that can reliably grip the gripping part even when the gripping force by a chuck device is small.

(Means for Solving the Problems) The screw auger of the horizontal hole excavation device of the present invention has a grip portion gripped by the chuck device of the side hole excavation device that has a polygonal shape or a plurality of protrusions arranged at equal intervals in the circumferential direction. The chuck device is characterized by having a structure in which the chuck device is provided with a stepped portion or a protrusion portion, which is a means for preventing the gripping claws of the chuck device from moving back and forth, at the front and rear of the gripping portion.

(Operation of the Invention) The chuck device grips the gripping portion of the screw auger by bringing two or more gripping claws close to each other in a direction substantially perpendicular to the axial direction of the screw auger and pressing them together or separating them. Or, if the gripping parts of the leading and trailing screw augers are gripped by the gripping claws of the fixed chuck device and the rotating chuck device, respectively, and the male and female screw parts are screwed together, the grips of the screw augers are released. Since the part is polygonal or has a structure in which multiple protrusions are arranged at equal intervals in the circumferential direction, the gripping claws engage with the corners or protrusions of the polygonal gripping part, so that each gripping part In this case, rotation relative to the gripping claws pressed against each of the gripping claws is prevented.

Furthermore, due to the presence of steps or protrusions that are means for preventing the back and forth movement of the gripping claws of the chuck device at the front and rear of the gripping part, one gripping claw may shift relative to the gripping part in the front-back direction. However, the gripping claws are blocked by the step or protrusion.

(Example) The details of the present invention will be explained below with reference to Examples. FIG. 1 shows an embodiment of the screw auger according to the present invention, and the screw auger 5 has a cylindrical or rod-shaped main body 5A with screw blades 5B for digging formed around the main body 5A.
A male thread 5C is provided at the front end (the part that precedes at t1m), and a grip portion 5D is provided at the rear end. The grip portion 5D has a hexagonal shape, and is provided with a step portion 5E and a protrusion portion 5F at the front and rear thereof to prevent the grip claw from moving in the front and back direction. Further, a female thread 5G is formed in the grip portion 5D.

The screw auger 5 in Fig. 1 is shown for a part other than the most extreme one, and the one at the most extreme part has a male thread 5C at the tip.
Instead, it is formed into a pointed shape.

The screw auger shown in FIG. 1 is used in a horizontal hole boring device as shown in FIGS. 2 and 3. That is, the horizontal hole excavation device 1 moves up and down as its frame IA is guided by vertical movement guide means such as a guide rail (not shown) provided in the vertical hole 6, and the frame LA has a screw auger rotating device. 2 is mounted so as to be freely traversable, and a traversing device 3 is mounted for traversing the rotary device together with the screw auger 5.Furthermore, a fixed chuck device 4 is installed at the forefront of the frame 1.

The screw auger rotating device 2 includes a rotary drive device consisting of a hydraulic motor 2A and a rotational power transmission device 2B for the two hydraulic motors, and a rotary chuck device 2C that is provided on the output side of the transmission device 2B and grips the screw auger 5. As schematically shown in FIG. 6, the one-rotation chuck device 2C consists of a screw auger mounting portion radially attached to the frame of the transmission device 2B, and the mutual angles are equal (
A screw auger gripping pawl 2e is attached to each of the three grooves 2f provided at an angle of 120 degrees so as to be slid by a hydraulic actuator (not shown).

Further, the traverse device 3 includes a hydraulic motor 3A.

It consists of a sprocket 3B rotated by the hydraulic motor 3A, sprockets 3C and 3D attached to the frame IA, and a chain 3E hung on these sprockets 3B, 3C and 3D, and a part of the chain 3E is connected. The screw auger rotating device 2 is connected to the side of the frame of the screw auger rotating device 2 by a tool 3F, and the screw auger rotating device 2 is moved forward and backward by rotating the hydraulic motor 3A in forward and reverse directions.

Further, as shown in FIGS. 4 and 5, the fixed chuck device 4 includes a gate-shaped frame 4A fixed on the side of the frame, and a hydraulic cylinder 4B attached to the upper part of the frame 4A. , are rotatably attached to the left and right pillars of the frame 4A, respectively, around pins 4C and 4D,
and a screw auger gripping claw 4E connected to the piston rod 4b of the hydraulic cylinder 4B by a pin 4G.

Consists of 4F.

When digging the horizontal hole 7 using this horizontal hole digging device l,
As shown in FIGS. 6 and 7, the grip portion 5D of the screw auger 5 is held by the grip claw 2e of the rotary chuck device 2C.
and the hydraulic motor 3A of the traversing device 3 and the rotating device f.
By operating the hydraulic motor 2A of f12, the screw auger 5 is advanced and rotated to excavate a horizontal hole, but once the rotating device 2 has moved to the forward limit position, the horizontal hole digging device l is pulled up to the ground. Then, it is necessary to attach a new screw auger to the rotary chuck device 2C, lower the horizontal hole excavation device 1 to the bottom of the vertical hole again, add a screw auger, and restart excavation.

Here, as shown in FIGS. 2 and 3, the screw auger is indicated by 5-1.5-2.5-3 from the top,
When digging to the second screw auger 5-2 and adding the third screw auger 5-3, the hydraulic cylinder 4B is contracted and the gripping claws of the fixed chuck device 4 are 4E and 4F grip the grip portion 5D of the second screw auger 5-2, while the third screw auger 5-3 grips the grip portion 5D of the rotary chuck device 2C as shown in FIGS. 6 and 7. The traverse device M is rotated by the hydraulic motor 2A while being gripped by the gripping claws 2e.
The hydraulic motor 3A of No. 3 is rotated forward to move forward. As a result, the male thread 5C at the tip of the third screw auger 5-3 is screwed into the female thread 5G of the second screw auger 5-2, and the third screw auger 5-3 is connected to the second screw auger 5-2. This will be added to 5-2.

Next, the hydraulic cylinder 4B of the fixed chuck device 4 is extended to release the fixation of the second screw auger 5-2, and digging is resumed.

On the other hand, when separating the screw auger, both the hydraulic motors 2A and 3A are connected while each gripping portion 5D of the screw auger 5-2, 5-3 is gripped by the fixed chuck device 4 and the rotary chuck device 2C. Rotate in the opposite direction to the above to unscrew the male thread 5C and female thread 5G.

Here, when adding and separating the screw auger, since the grip part 5D of the screw auger is polygonal,
The gripping claws 4E, 4F, and 2e are prevented from rotating relative to one gripping portion 5D due to the presence of the corners of the gripping portion 5D. In addition, a stepped portion 5E and a protrusion 5F before and after the grip portion are provided.
Due to the presence of the screw auger, the gripping claws 4E, 4F, and 2e are prevented from shifting relative to the grip portion 5D in the front-rear direction when adding or separating the screw auger.

In addition, when adding screw augers, if there is misalignment between the leading screw auger and the following screw auger, it may be impossible to add the screw auger, or the male screw 5C
However, this may cause damage to this part or breakage of the screw auger due to strain on the threaded connection between the screw and the female screw 5G.
As in this embodiment, the number of corners of the polygonal grip portion 5D is
Number of gripping claws 4E and 4F of fixed char 2-gripping device 4 (2)
By setting the number (6, 12, . . . ) to be a common multiple of the number (3) of the gripping claws 2e of the rotary chuck device 2C, the gripping portion 5D can be gripped in an unstable posture as shown in FIG. Even if this happens, the axis 0 of the screw auger 5 and the center σ of the rotary chuck device 2C coincide, and no misalignment occurs (the same applies to the fixed chuck device 4).

@ Figure 9 and Figure 1O are other embodiments of the present invention in which the upper portion 5D is not polygonal, but has a structure in which projections 5H are arranged at equal intervals in the circumferential direction, The number of protrusions 5H in this example is equal to the number of gripping claws 4E of the fixed chuck device 4.
, 4F is the least common multiple (6) of the number (2) of the gripping claws 2e of the rotary chuck device 2C (3). In this case, as shown in FIG. Even if it is pressed, or even if it comes into contact with the tip of the protrusion 5H as shown in Fig. 10,
It does not cause misalignment.

On the other hand, the number of corners or protrusions 5H of the gripping part 5D is determined by the number (2) of the gripping claws 4E, 4F of the fixed chuck device @4 and the number (3) of the gripping claws 2e of the one-rotation chuck device 2C. If it is not a common multiple, as shown in Figure 1, depending on the relative position of the corner or protrusion 5H and the claw 2e in the rotational direction,
There are cases in which the axis of the screw auger 5 and the center of the rotary chuck device 2C coincide, and cases in which they are misaligned.
There will come a time when it will not be possible to continue adding.

In addition, although the above description was made with a focus on the construction of a new gas pipe, the present invention can also be applied to other cases where a horizontal hole is dug underground.

(Effects of the Invention) According to the present invention, the gripping portion of the screw auger can be reliably gripped by the gripping claws of the chuck device without relative slipping in the rotational direction and the front-back direction. Therefore, according to the present invention, the chuck device can be constituted by a relatively small-scale device, and in particular, the screw auger attached to a horizontal hole excavation snow making machine is used by being attached and detached by remote control in a place where space is limited. The optimal one will be realized.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a screw auger according to the present invention, FIG. 2 is a plan view showing an example of a horizontal hole excavation device using the screw auger of the present invention, FIG. The figure is a sectional view of g-B in Fig. 3, and Fig. 5 is a cross-sectional view of C in Fig. 4.
-C sectional view, FIG. 6 is a DD sectional view in FIG. 3, FIG. 7 is an E-E sectional view in FIG. 6, and FIG.
9 and 1θ are cross-sectional views illustrating that the axial center positions of the screw auger and the chuck device do not deviate regardless of the engagement posture of the gripping portion and the gripping claw, and FIG. 9 and FIG. FIG. 3 is a cross-sectional view showing an example of the gripping position of the gripper with the gripping claws changed. Patent applicant Tokyo Gas Co., Ltd. and one other agent Patent attorney Masami Akimoto and one other person Figure 2 Figure 3 Figure 4, %-C L>C Procedural amendment (method) April 8, 1985

Claims (1)

[Scope of Claims] 1. In a side hole excavation device that excavates a side hole while sequentially adding a plurality of screw augers in a female and male screw type, a grip portion gripped by a gripping claw of a chuck device of the side hole excavation device, A horizontal hole excavator characterized by having a structure in which polygonal or plural protrusions are arranged at equal intervals in the circumferential direction, and a means for preventing back and forth movement of the gripping claw is provided at the front and rear of the gripping part. Equipment screw auger. 2. The chuck device includes a fixed chuck device having a plurality of gripping claws that grip the gripping portion of the leading screw auger, and a plurality of gripping claws gripping the gripping portion of the trailing screw auger. The number of corners or protrusions of the gripping portion is determined by the number of gripping claws of the fixed chuck device and the number of gripping claws of the rotary chuck device. A screw auger for a horizontal hole excavation device according to claim 1, characterized in that the screw auger is a common multiple of numbers.