JPH0240154Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is suitable for constructing underground pipes for fluids such as gas pipes and water pipes, or pipes for accommodating power lines, optical or electric signal lines, etc. The present invention relates to a hydraulic circuit for traversing in a device that excavates a relatively small-diameter horizontal hole, such as a horizontal hole for discharging water or a horizontal hole for discharging water.

(Prior Art) The inventors of the present invention have already developed a device for excavating horizontal holes for underground piping (including inclined holes) by remote control. In this device, a casing is fitted into a vertical hole drilled to the depth of an existing pipe or to a predetermined depth, and a screw auger rotation drive device is attached to a lifting frame that lifts and lowers the inside of the casing using a lifting device such as a winch. , a traverse device that reciprocates the rotary drive device, and a chuck device that rotates and fixes the screw auger attached to the front end of the rotary drive device and the lift frame, respectively, and the lift frame is pulled up. Attach the screw auger to the rotary chuck device, lower the elevating frame to the bottom of the vertical hole, move the screw auger forward while rotating it, and dig into the ground through the opening at the bottom of the casing. , the screw auger is separated from the rotary chuck device, the lifting frame is pulled up by the lifting device, a new screw auger is attached to the rotating chuck device, the lifting frame is lowered again, and the following screw auger is attached to the leading screw auger. This involves repeating the process of adding an auger and digging.

However, in this horizontal hole drilling equipment, when excavating while rotating the screw auger and operating the traverse hydraulic motor to move the screw auger forward, the rotation of the screw auger causes the blades of the screw auger to move the earth and sand backward. Since excavation is performed while pushing away, the reaction force from the earth and sand generates a force that moves the screw auger forward, which generates a force that rotates the traverse hydraulic motor as a pump, increasing the forward speed of the screw auger. There was a problem in that the dirt from the excavation hole could not be removed backwards by the blades of the screw auger, and the dirt remained between the blades of the screw auger, making it impossible to excavate a hollow horizontal hole.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, an object of the present invention is to provide a hydraulic circuit for a traversing hydraulic motor configured to allow the horizontal hole to be excavated into a hollow shape.

(Means for solving the problem) In order to achieve this object, the traversing hydraulic circuit of the lateral hole drilling equipment of the present invention limits the flow rate of the hydraulic oil of the screw auger to the hydraulic circuit of the traversing hydraulic motor. The present invention is characterized by comprising a throttle valve and a check valve connected in parallel to the throttle valve and oriented in a direction to block the flow of hydraulic oil when the rotary drive device moves forward. When the screw auger moves forward, the brake is applied, and the excavated soil is pushed backward by the blades as it is excavated.
A completely hollow side hole can be excavated.

(Example) The details of the present invention will be explained below with reference to FIGS. 1 to 3, taking as an example horizontal hole excavation for constructing a new gas pipe. FIG. 2 shows a state in which a horizontal hole drilling device to which the present invention is applied is used to excavate a horizontal hole, and FIG. 3 shows the main part configuration of the horizontal hole drilling device.

In Fig. 2, A is an existing gas pipe buried underground under the road, B is a vertical hole excavated from the ground to a depth reaching the existing gas pipe A, 1a,
1b is a casing pushed into the vertical hole B, and depending on the depth of the vertical hole B, one or more casings of appropriate length are provided. 2 is an elevating frame consisting of a portal-shaped support frame 3 and a guide frame 4 attached to the support frame 3;
As shown in FIG.
Guide rollers 6 are installed at opposite positions on the inner walls of a and 1b to roll along guide rails 5 fixedly provided in the vertical direction.

A screw auger 25 is attached to the support frame 3.
The guide frame 4 on which the rotary drive device 7 is movably mounted has a vertically long notch provided in a direction perpendicular to the opposing direction of the guide rails 5, 5, that is, in the lower part of the casing 1a. It is mounted almost horizontally toward the screw auger insertion opening 9. In addition, in order to excavate an inclined horizontal hole, the guide frame 4 is pinned to the support frame 3 so as to be tiltable, and the guide frame 4 is fixed to the support frame 3 so as not to be tiltable by tightening screws at a desired angle of inclination. , support frame 3 by an inclination angle adjustment device such as a turnbuckle.
In some cases, the guide frame 4 and the guide frame 4 are connected.

A pair of guide rails 10, 10 are fixed to the guide frame 4 in its longitudinal direction, and grooves provided on the outer periphery of guide rollers 11 attached to the four corners of the lower surface of the rotary drive device 7 are formed in the guide rails 10. By fitting, the rotary drive device 7 is positioned and movable by the guide rail 10.

On the guide frame 4 is the rotary drive device 7.
A hydraulic motor 12 for traversing is installed, and a sprocket 13 rotated by the hydraulic motor 12, and a chain 6 hung on sprockets 64 and 65 attached near both ends of the guide frame 4.
6 provided on the side of the rotary drive device 7;
7 and rotates the hydraulic motor 12 in forward and reverse directions, the rotary drive device 7 rotates the guide rail 10.
It is now moving forward and backward along the same lines.

The rotation drive device 7 includes a hydraulic motor 7a for rotating the screw auger and a rotary chuck device 7b,
It also incorporates a mechanism (not shown) for operating the rotary chuck device 7b. The details of the rotary chuck device 7b are not shown in the figure, but like a rotary chuck device used for gripping a rod-shaped workpiece in a machine tool, for example, the rotary chuck device 7b has a radial shape on a rotating body rotated by the hydraulic motor 7a. A chuck claw is slidably fitted into each of the plurality of wide-bottomed grooves formed in the groove, and the claw is moved in the radial direction by a hydraulic cylinder (not shown) to grip the grip portion 25a of the screw auger 25. Those that perform and release are used.

A fixed chuck device 14 for adding a screw auger 25 is attached to the end of the guide frame 4. The fixed chuck device 14 includes:
A pair of left and right hydraulic cylinders 30, 31 each having a tube pinned to the guide frame 4, and a pair of left and right hydraulic cylinders 30, 31 each rotatably attached to the guide frame 4 about pins 17, 18, one end of which is connected to the piston rod of each of the hydraulic cylinders 30, 31. links 21 and 22 connected by pins 19 and 20, and a claw that engages with the other end of each link 21 and 22 through pins 23 and 24, and that grips the grip portion 25a of the screw auger 25 at the tip. It consists of claw holders 28 and 29 to which 26 and 27 are attached, and a hydraulic cylinder 30,
By expanding and contracting 31, the grip portion 25a
can be grasped or released. 32 is an auger guide attached to the opening 9 to prevent the entrance of the side hole from collapsing.

In FIG. 2, a frame 33 is installed on the casing 1b and fixed with screws 50, and the frame 33 has a winch 34 for lifting and lowering the lifting frame 2, an operating device 35, a hydraulic unit 53, and a control panel 54. It is equipped. On the left and right sides of the frame 33, there are guide rails 5A that are continuous with the guide rails 5 of the casing 1b. The wire rope 51 wound up and let out by the winch 34 is hung on a sheave 52 attached to the center of the upper frame 3c of the support frame 3, and the lift frame 2 is moved up and down by forward and reverse rotation of the drum of the winch 34. has been done.

The operating device 35 includes an operating panel 5 on a telescoping pole 55.
7 is attached, and an operating lever 37 for controlling the rotational direction and speed of the traverse hydraulic motor 12 is attached to the upper part of the pole 55. Control panel 5
7 is a switch for turning the operating power on and off;
Hydraulic cylinders 30, 31 of the fixed chuck device
a push button switch that operates to open and close the pawls 26 and 27, a push button switch that commands left rotation, right rotation, and stop of the screw auger 25 by the hydraulic motor 7a, and a push button that opens and closes the rotary chuck device 7b. switch, winch 3
4, a push button switch for winding up, winding down, and stopping, an indicator lamp, etc. are provided.

The hydraulic unit 53 is connected to each hydraulic motor 7.
A, 12, the hydraulic motor and hydraulic cylinders 30, 31 of the winch 34, a switching valve for the hydraulic cylinder (not shown) of the rotary chuck device 7b, etc. are housed in the box. The control panel 54 includes switches on the operation panel 57 and the hydraulic unit 53.
A hydraulic gauge that houses the electrical circuit and equipment that relays the hydraulic equipment in the traversing hydraulic motor 12 and displays the hydraulic pressure of the hydraulic oil to the traversing hydraulic motor 12, and the traversing hydraulic motor 7.
An oil pressure gauge that displays the oil pressure of the hydraulic oil to the hydraulic motor 12, a variable knob that adjusts the flow rate of the hydraulic oil to the hydraulic motor 12, and the like are installed.

43, 44 and 45 are the hydraulic unit 5
In contrast to No. 3, these are hydraulic hoses and cables each having one end connected to a hydraulic pump, an oil tank, and a power source mounted on a work vehicle (not shown).
The hydraulic hoses 43 and 44 branch to hydraulic equipment such as valves operated by the push button switches and the like in the hydraulic unit 53, and a hydraulic hose group 47 consisting of pairs of hydraulic hoses forming each branch flow path is , are connected to the drive devices of the respective devices, that is, the hydraulic cylinders 30, 31 of the fixed chuck device 14, the drive device of the rotary chuck device 7b, and the hydraulic motors 7a, 12.

In this device, an operator 60 sits on a chair 59 placed in front of the casing 1b in the excavation direction, with the lifting frame 2 pulled up as shown by 2', and with the rotary drive device 7 in the retreat position. After mounting the most advanced screw auger 25' (having a sharp tip) on the mounting base 58 that has a positioning function with respect to the rotary chuck device 7b, the winch winding on the operation panel 57 is mounted. Press the push button switch for lowering operation to turn winch 3
4 in the lowering direction, and raise and lower the lifting frame 2 until a locking piece (not shown) attached to the support frame 3 comes into contact with a stopper (not shown) attached to the lower part of the guide rail 5 and is locked. lower it. Next, operate the operating lever 37 in the direction of arrow a in FIG. Hydraulic motor 7a
is operated in the excavation direction (clockwise rotation) to excavate a horizontal hole. After advancing the rotary drive device 7 to the frontmost position, press the corresponding push button switch on the operation panel 57 to open the rotary chuck device 7b and release the screw auger 25', and move the operation lever 37 to the position shown in FIG. By operating in direction b, the rotary drive device 7 is moved backward, the elevating frame 2 is pulled up by the winch 34, and the next screw auger 25 (the male thread that engages with the female thread at the tail end of the screw auger 25' is attached to the tip) (having a rotary chuck device 7b)
by lowering the lifting frame 2 again, gripping the gripping portion 25a of the screw auger 25' at the tip by the fixed chuck device 14, and then moving the rotary drive device 7 forward and operating it in the excavation direction. The male thread at the tip of the screw auger 25 is screwed into the female thread at the tail end of the screw auger 25'. Then, excavation is continued in the same manner as above.
Incidentally, after excavating with the screw auger 25' at the tip, the auger guide 32 is attached to the opening 9 of the casing 1a, but the explanation thereof will be omitted. After drilling the side hole to the destination or predetermined depth, the screw auger 25 is pulled out in the reverse order as described above.

In this embodiment, the hydraulic circuit of the traverse hydraulic motor 12 is configured as shown in FIG. In FIG. 1, 70 is a hydraulic pump mounted on the work vehicle, 71 is a relief valve, and 72 is a hydraulic pump mounted on the working vehicle.
is inserted into the hydraulic circuits 73 and 74 for the hydraulic motor 7a of the rotary drive device 7, and is switched by the operator 60 operating a push button switch to control the hydraulic motor 7a;
Reference numerals 5 and 76 indicate flow control valves each constructed by a parallel circuit of variable throttle valves 77 and 78 and check valves 79 and 80, and by adjusting the variable throttle valves 77 and 78, the right The flow rate can be adjusted during (excavation) rotation and counterclockwise rotation (when removing and rotating the screw rod 25).

Reference numeral 81 denotes a switching valve for the traversing hydraulic motor 12. The switching valve 81 uses the operating lever 37 as an operating means, and has a function of controlling the flow rate according to the operating angle of the operating lever 37. A pressure reducing valve 83 is inserted into the pump side circuit 82 of the switching valve 81 to reduce the pressure to a suitable oil pressure, and one circuit 84 on the secondary side of the switching valve 82 is directly connected to one inlet/outlet of the hydraulic motor 12. , and the other circuit 85 is connected via a flow control valve 88 consisting of a variable throttle valve 86 and a check valve 87. The direction of the check valve 87 is set such that the flow rate is adjusted only when the hydraulic fluid flows in the forward direction of the screw rod 25 (c), and is not adjusted when the flow is in the backward direction (d).

Reference numeral 89 denotes an unload valve that controls communication and cutoff of the secondary side circuits 84 and 85, and its primary side circuit is connected to the secondary side circuits 84 and 85 through circuits 90 and 91, and the secondary side circuit 92 is connected to a return circuit 94 to tank 93.

In the circuit shown in FIG. 1, the operator switches the switching valve 72 to the left position to rotate the hydraulic motor 7a, that is, the screw rod 25 in the excavation direction (r direction), and at the same time operates the operating lever 37 to rotate the switching valve 8.
1 to the left position and excavation is performed while advancing the screw rod 25 by flowing hydraulic oil in the direction of arrow c to the hydraulic motor 12, the flow rate of the hydraulic oil to the hydraulic motor 12 is controlled by the variable throttle valve 86.
Therefore, by appropriately setting the flow rate set by the variable throttle valve 86, the flow resistance is appropriately set, and the rotation of the hydraulic motor 12 is restricted. As a result, the screw rod 25
Due to the reaction force of the earth and sand acting on the blades of the screw rod 25 due to the rotation of the screw rod 25,
A force is generated to resist the force that attempts to move the rotary drive device 7 forward, and the brake is applied, and the excavated soil is excavated while being pushed backward by the blades, so that it is completely hollow. A side hole can be drilled. When removing the screw rod 25, the unload valve 89 is switched to the left position and the left and right hydraulic oil inlets and outlets of the hydraulic motor 12 are short-circuited. Move freely forward and backward, switch the switching valve 72 to the right position, and set the leading screw rod 25 to the fixed chuck device 1.
4, and rotates the screw rod 25 held by the rotary chuck device 7b in the opposite direction when excavating.

The above embodiment has been explained by taking the installation of a new gas pipe as an example, but the present invention is also suitable for burying a new pipe for other fluids, burying a new pipe in an existing pipe, and accommodating various cables and signal lines. Burying pipes,
Furthermore, it is also used when excavating holes for draining underground water.

(Effects of the invention) As described above, in the present invention, the hydraulic circuit of the traversing hydraulic motor includes a throttle valve that limits the flow rate of hydraulic oil of the screw auger, and a throttle valve that is connected in parallel to the throttle valve. A check valve is installed to prevent the flow of hydraulic oil when the rotary drive unit moves forward, so the brake is applied when the screw auger moves forward, and the excavated soil is pushed backward by the blades while being excavated. , it is possible to excavate a completely hollow horizontal hole suitable for passing pipes, etc.

[Brief explanation of the drawing]

Fig. 1 is a hydraulic circuit diagram showing an embodiment of the traversing hydraulic circuit of the horizontal hole drilling device of the present invention, Fig. 2 is a side view showing an example of the horizontal hole drilling device to which the hydraulic circuit of the present invention is applied, and Fig. 3 2 is an enlarged cross-sectional view of the lower part of the device shown in FIG. 2; FIG.

Claims (1)

[Scope of utility model registration request] A horizontal hole drilling device comprising a rotation drive device for rotating a screw auger in a vertical hole excavated from the ground, and a traverse device having a traverse hydraulic motor for advancing and retracting the rotation drive device, wherein the traverse hydraulic motor The hydraulic circuit includes a throttle valve that limits the flow rate of the hydraulic oil of the screw auger, and a check that is connected in parallel to the throttle valve and is oriented in the direction of blocking the flow of the hydraulic oil when the rotary drive device moves forward. A hydraulic circuit for traversing a lateral hole drilling device, characterized in that it is provided with a valve.