JPH0534474B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applicable to fluid pipes such as gas pipes and water pipes buried underground, power lines, optical and electric signal lines,
Water-supply type horizontal hole drilling equipment that excavates relatively small-diameter horizontal holes, such as horizontal holes for constructing pipes to accommodate power lines, etc., or horizontal holes for discharging water, and excavates while squirting water from the tip of the auger. Regarding equipment.

(Prior Art) The present inventors have developed the above-mentioned horizontal hole for underground pipes.
We are developing a horizontal hole drilling device that can excavate roads, etc. without digging trenches. This horizontal hole drilling device reciprocates a rotary drive device having a rotary chuck device that grips an auger on a guide frame, and excavates while screwing an auger having screw blades as it reciprocates. It is.

(Problems to be Solved by the Invention) However, with this horizontal hole drilling device, when the geology to be excavated is highly sticky clay or hard soil such as the Totan layer, the excavation resistance becomes large. There were problems in that the direction of the hole was bent and drilling became impossible.

To solve these problems, as described in Japanese Utility Model Application No. 54-88001 or No. 61-80882, water holes are bored in the auger.
Some excavators excavate by ejecting water from the tip of the auger through the water hole and softening the excavated soil with the ejected water. However, if the method described in these publications is adopted for horizontal hole excavation for underground pipe construction, the water inside the auger that has entered the ground when adding the auger will flow out from the end of the auger closest to you. When a new auger is added and digging is resumed, water cannot be ejected from the tip of the auger until the now longer auger is filled with water, resulting in poor work efficiency and problems due to water flowing out. ,
The problem was that the working environment was poor.

In view of the above-mentioned problems, the present invention makes it possible to excavate while allowing water to flow out from the tip of the auger so that the auger can be moved straight even when the excavation target is clay. At the same time, it is an object of the present invention to provide a water supply type horizontal hole drilling device having a water supply system that does not cause water leakage not only during excavation but also when adding an auger.

(Means for Solving the Problems) In order to achieve this object, the present invention grips a supplementary auger by a rotary chuck device provided on a rotary drive device of the auger, and places the rotary drive device on a guide frame. In this device, a water hole is provided through the center of the auger, and a seal is installed between the auger's adding section and the mounting tube of the auger and the rotary chuck device. A ring is interposed between the auger and the auger, and a water spout is provided in the cutting bit of the auger at the tip, and a passage for supplying water from a water supply source into the auger is provided in the rotary drive device and the rotary chuck device; is characterized by having a check valve at its tail end.

(Example) An example of the present invention will be described below with reference to the drawings.
1 and 2 show the overall configuration of an embodiment of the horizontal hole drilling apparatus according to the present invention, in which 1 indicates underground piping, 2
3 is a casing fitted into the vertical hole 2; 4 is a horizontal hole drilling device installed in the casing 3 so that it can be raised and lowered; and 5 is an operation device installed on the casing 3. The device 6 is a water supply device installed on the ground.

As shown in FIGS. 2 and 3, two guide rails 7 are provided on the casing 3 and the frame 8 of the operating device 5 so as to face each other, and a gate-shaped frame 9 forming the horizontal hole drilling device 4 is provided. Guide rollers 10 for rolling along the guide rail 7 are attached above and below the left and right column parts. Further, a guide frame 11 is attached to the lower part of the portal frame 9.

Parallel guide rails 13 are fixed to the guide frame 11 so as to face the opening 12 provided in the casing 3, and the rotation drive device 15 of the auger 14 has two guide rails attached to the left and right sides of the guide rail 13. The rollers 16 are movably installed on the guide frame 11 by being engaged with the rollers 16 so as to be able to roll along the guide rails 13 . The rotational drive device 15
has a rotary chuck device 17 for gripping the tail end 14a of the auger 14 at the front, and a rotational hydraulic motor 18 for rotating the auger 14.

FIG. 4 is a cross-sectional view showing the internal structure of the rotary drive device 15, in which a drive gear 30 attached to the output shaft of the auger rotation hydraulic motor 18 meshes with a receiving gear 32 rotatably attached to the case 31. The receiving gear 32 is connected to the tip of a tube 34 of a hydraulic cylinder 33 for opening and closing a chuck pawl, which is rotatably mounted inside the case 31. A chuck pawl holding block 38 is connected to the receiving gear 32 by bolts 37, and three chuck pawls 39 are attached to the block 38 so as to be able to open and close radially. A sliding block 40 is accommodated in the chuck pawl holding block 38 so as to be slidable in the axial direction of the hydraulic cylinder 33, and an inclined groove 40a provided around the sliding block 40 is inserted into each chuck. Claw 39
The sliding block 40 is slidably engaged with the inverted T-shaped inclined sliding leg 39a of the hydraulic motor 18.
The rotary chuck device 17 consisting of the hydraulic cylinder 33 and the chuck pawl 39 rotates due to the rotation of the hydraulic cylinder 33, and the sliding block 40 moves due to the expansion and contraction of the hydraulic cylinder 33, so that the chuck pawl 39 opens and closes. has been done.

Further, as shown in FIGS. 1 and 3, a traverse hydraulic motor 19 for reciprocating the rotary drive device 15 is provided on the side of the rotary drive device 15. A pinion 20 attached to the output shaft is engaged with a rack 21 provided parallel to the guide rail 13, and the rotary drive device 15 is configured to reciprocate by forward and reverse rotation of the hydraulic motor 19.

In FIG. 3, 22 is a fixed chuck device attached to the front part of the guide frame 11, which is partially buried in the ground when the auger 14 is removed and, if necessary, when the auger is added. This is to hold the tail end 14a of the leading auger 14 that is being held.
The fixed chuck device 22 includes a pair of claws 23 and 24 that are attached to open and close the tail end of the auger 14 so as to be able to grip and release it, left and right hydraulic cylinders 25 and 26 for opening and closing, and each piston rod. It consists of link mechanisms 27 and 28 that transmit movement to the claws 23 and 24, respectively.

As shown in FIGS. 1 and 2, the operating device 5 includes:
The hydraulic motor 18 for rotating the auger, the hydraulic cylinder 33 for opening and closing the chuck pawl, and the fixed chuck device 2
An operation panel 42 consisting of switches for operating the two hydraulic cylinders 25 and 26, and a hydraulic motor 19 for traversing.
a winch 44 for raising and lowering the horizontal hole drilling device 4; and reels 46 and 47 for winding cables connected to hydraulic hoses 45 connected to each actuator of the horizontal hole drilling device 4, lighting lights, limit switches, etc. , a control device 48 that accommodates a switching valve and the like inserted between a power source or hydraulic power source mounted on a work vehicle or the like (not shown) and an actuator of the horizontal hole drilling device 4.

Next, a water supply system that causes water to flow out from the tip of the auger 14 will be described. As shown in FIG. 4, the tail end 14a of each auger 14 is formed into a female thread, and the tip end 14b is formed into a male thread that is screwed into the female thread. is installed throughout. In addition, a seal ring 51 made of rubber or the like is fitted to the connecting part of the auger 14, that is, in this example, the corner part between the flange 14c provided at the front part of the auger 14 and the male screw 14b, and the auger is connected to the connecting part of the auger 14. In this state, the tail end 14a of the leading auger 14 and the collar part 14 of the trailing auger 14
The seal ring 51 is sandwiched between the seal ring 51 and the seal ring 51 to exert a sealing action.

In addition, as shown in FIG.
4, an axial water passage hole 50A and a radial outlet 50B, which are connected to
B faces the bottom of a groove 52 provided in the circumferential direction at the tip of the drilling bit 14A, and a backflow prevention tool 53 made of a ring made of an elastic material such as rubber to prevent backflow of water is fitted into the groove 52. It is established by

As shown in FIGS. 4 and 7, a receiving plate 54 is fixed to the chuck pawl holding block 38 with a bolt 37 (the receiving plate 54 has a groove for moving the chuck pawl 39 similarly to the chuck pawl holding block 38). ) has an integral cylindrical mounting tube 55 in the center that fits into the female threaded hole at the tail end of the auger 14, and around the base of the mounting tube 55 is a seal ring made of rubber or the like. The seal ring 56 is fitted between the mounting tube 55 and the tail end of the auger 14 held by the rotary chuck device 17.
are sandwiched and a sealing effect is exerted.

A passage for supplying water to the auger 14 is provided in the case 31 of the rotary drive device 15 and the rotating body therein. The passage communicates with a water hole 59 provided in the case 31 and connected to the water supply hose 57 via a connecting fitting 58, and slides with the receiving gear 32 on the inner surface of the case 31. A groove 60 provided in the circumferential direction on the surface, and a water passage hole 61 provided in the radial direction in the receiving gear 32 so as to communicate with the groove 60.
and a receiving gear 32 so as to communicate with the water passage hole 61,
The chuck claw holding block 38 and the receiving plate 5
A water passage hole 62 provided in the axial direction in 4 and the water passage hole 62
and a water passage hole 63 provided in the receiving plate 54 in the radial direction so as to communicate between the water passage hole 50C at the center of the mounting tube 55.

As shown in FIG. 1, the water supply device 6 includes an electric or hydraulic motor 66 installed on a stand 65,
A water supply pump 67, such as a screw pump, driven by this, and a stable liquid dissolving device 68, such as bentonite, which changes the viscosity of water depending on the quality of the excavated soil (69 is a stirring blade, and 70 is a stirring motor). have,
A water supply hose 71 connected to the discharge side of the water supply pump 67 has a stop valve 72.
is connected to the stationary shaft side of a reel 73 installed on the frame 8 of the operating device 5, the water supply hose 57 is wound around the reel 73, and the reel 73 is equipped with a tensioning device such as a spring spring. (not shown) is provided.

In this device, when adding an auger, the horizontal hole drilling device 4 is pulled up by the winch 44, and with the rotary drive device 15 retreated, the screw hole of the tail end 14a of the next auger 14 is inserted into the mounting tube 55.
, and closes the rotary chuck device 17 to grip the auger 14 and lower the horizontal hole drilling device 4 until it is stopped by a stopper (not shown) in the casing 3, which is partially buried underground. The following auger 1
The male thread at the tip 14b of No. 4 is screwed into the female thread at the tail end 14a of the leading auger 14. Next, the stop valve 72
By opening the water supply pump 67 and operating the water supply pump 67, the water supply pressure causes the backflow preventer 53 to flow from the spout 50B of the drilling bit 14A at the tip of the auger 14.
The water flows out against the elasticity of the auger 14, and excavation is performed while softening the earth and sand around the auger 14. Therefore,
Even when excavating clay, the auger 1
4 can be moved straight to perform excavation.
At this time, by adjusting the mixing amount of the stable liquid in the stable liquid dissolving device 68, water (stable liquid) having a viscosity depending on the soil and sand is supplied, making stable excavation possible. In addition, since the backflow preventer 53 closes the water spout 50B when the water supply is stopped, there is no risk of muddy water flowing back and blocking the water hole 50 or the spout 50B. In addition, since a seal ring 51 is provided at the joint part of each auger 14, the auger 14
There is no leakage of water supply from the joint between the parts, and since a seal ring 56 is also provided at the root of the mounting tube 55 of the rotary chuck device 17, leakage from the rotary chuck device 17 is also prevented, and excavation is prevented. Water can be effectively supplied from bit 14A.

FIG. 8 shows an example of a structure for preventing backflow of water from the auger 14 in the present invention. As shown in A, a valve body 75 and a spring 7 are provided at the rear of the auger 14.
6 and a groove 77 are provided, and the pressure of the spring 76 is set to such an extent that it can be opened by the water supply pressure. Further, a valve 83 consisting of a valve body 80, a spring 81, and a groove 82 is also provided on the mounting cylinder 55 provided on the receiving plate 54, and the valve body 80 is made to extend. At the time of auger setting, as shown in B, the valve bodies 75 and 80 come into contact with each other and the valve 7
8 and 83, and the check valve 78 of the auger 14, which is buried underground, is configured to be opened by water supply pressure.

In this configuration, even when the rotary chuck device 17 is released from the rearmost auger buried in the ground to replenish the auger 14 and the horizontal hole drilling device 4 is pulled up, water is stored in the water passage hole 50 of the auger 14. The water flowing into the vertical hole 2 is drained by the action of the check valve 78.
Since there is no leakage into the auger 14, when the auger 14 is added to the rotary chuck device 17 on the ground and lowered to the bottom of the hole again to add the auger 14, and the water supply pump 67 is operated to supply water to the auger 14, Since the water passage hole 50 in the auger 14 is filled with the previously supplied water, water can be immediately jetted out from the tip of the auger, improving efficiency. Also, auger 1
Since water will not flow back into the vertical hole 2 from 4,
The inside of the vertical hole 2 is not flooded with water, and deterioration of the working environment is prevented.

In addition, in this embodiment, by the function of the valve 83 provided in the mounting tube 55 on the side of the rotary chuck device 17, when the auger 14 is separated from the rotary chuck device 17, the horizontal hole drilling device 4 and the water supply hose 7
Since the water remaining in the mounting tube 55 does not leak out from the mounting tube 55, the efficiency improvement effect and the effect of preventing deterioration of the working environment are further enhanced.

Although the present invention has been described above with reference to embodiments, the present invention can also be applied to equipment that is installed in a vertical hole or trench such as an existing manhole in a stationary or elevating manner, or when excavation is performed by automatically adding an auger. Various modifications and additions can be made to the structure, combination, etc. of each component without departing from the gist of the present invention.

(Effects of the Invention) As described above, in the present invention, a water passage hole is provided through the center of the auger, and the connecting part of the auger and
A seal ring is interposed between the auger and the mounting tube of the rotary chuck device, a water spout is provided in the drilling bit of the auger at the tip, and a passage is provided for supplying water from a water supply source into the auger. Since it is installed in the rotary drive device and the rotary chuck device, even if the target to be excavated is clay, the soil around the auger can be softened while excavation is carried out, making it possible to move the auger straight ahead for excavation. Become.
Therefore, the auger will not be bent and deviated from the target.

In addition, seal rings are provided at the joints of each auger and at the auger attachment part of the rotary chuck device.
There is no leakage of water supply from these parts, and water can be effectively supplied from the tip drilling bit.

In addition, a check valve is installed on the auger, so when adding the auger, the water in the auger's water hole buried underground will not flow back into the vertical hole, and the next time the auger will be refilled. Since water is ejected quickly from the tip, it is possible to excavate efficiently, and the inside of the vertical hole is not flooded with water, which prevents deterioration of the working environment.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing one embodiment of a horizontal hole drilling apparatus according to the present invention, FIG. 2 is a front sectional view of the embodiment, FIG. 3 is a plan sectional view of the horizontal hole drilling apparatus of the embodiment, and FIG. 5 is a sectional view showing the structure of the excavation bit at the tip of the auger of the embodiment, FIG. 6 is a sectional view for explaining the operation of the excavation bit, and FIG. FIG. 7 is a front view of the rotary chuck device of this embodiment, and FIGS. 8A and 8B are cross-sectional views showing other examples of the auger tail end and the auger mounting tube of the present invention in separated and combined states, respectively. be.

Claims (1)

[Scope of Claims] 1. An additional type auger is gripped by a rotary chuck device provided on an auger rotation drive device, and the rotation drive device is reciprocated on a guide frame, and a horizontal hole is excavated while adding the auger. In the device,
A water passage hole is provided through the center of the auger, a seal ring is interposed between the auger joint and the mounting tube of the rotary chuck device, and a water spout is provided at the cutting bit of the auger at the tip. and a passage for supplying water from a water supply source into the auger is provided in the rotary drive device and the rotary chuck device, and the auger has a check valve at its tail end. Characteristic water supply type horizontal hole drilling equipment. 2. The water supply type horizontal hole drilling apparatus according to claim 1, wherein the mounting tube has a valve that opens when coupled with an auger.