JP2637014B2 - Ground drilling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground drilling apparatus used for laying various pipes buried underground.

[0002]

2. Description of the Related Art Water supply and drainage facilities construction and telephone
In the construction work of relatively small diameter pipes such as electricity and gas,
The present inventor has proposed a rotary arrowhead disclosed in Japanese Patent Application Laid-Open No. 62-264294 as a device for drilling an embedding hole for a pipe in the ground.

[0003] In this device, a plurality of spiral blades formed on a peripheral wall of a main body portion are pressed by a core rod inserted into a hollow portion inside thereof, and the spiral blades of the spiral blades are inserted into the ground. , And only the arrowhead is rotated along, thereby improving the straightness of intubation propulsion.

However, when an obstacle such as a concrete block, a pile, or a rock exists in front of the intubation in the ground, the tip of the arrowhead hitting the obstacle moves the obstacle to the soft ground. Turn around and turn,
There was a problem that the direction was lost with the propulsion and straight intubation was not performed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and has a front end portion inside a cylindrical leading conductor having a plurality of spiral blades radially protruding on an outer peripheral side. A sphere is attached to the concave portion provided in the first conductor, and a pressing body of the leading conductor is slidably inserted into the leading conductor via the sphere via the sphere, and the pressing means is pressed by a driving unit into a hollow portion provided in the pressing body. By inserting a hitting body for manipulating the body so as to be able to move forward and backward and linking the pressing means to the pressing body, it is possible to insert a straight buried pipe in the ground, not only in a relatively soft stratum, but also It is an object of the present invention to provide a ground drilling device that can perform intubation with high directional accuracy, because even if appears, it is crushed and propelled by a hitting body.

[0006]

Means of the present invention for achieving the above-mentioned object is to provide a tubular conductor having a hollow inside and a plurality of spiral blades radially protruding from the outer periphery thereof. A sphere that can fit into a recess provided at a front end in the front conductor, a pressing body of the front conductor whose front edge abuts the sphere by being slidably inserted into the front conductor, and the pressing body. The present invention provides a configuration of a ground drilling device including: a striking body which is inserted and retractably inserted into a hollow portion provided in the above-mentioned structure to operate the pressing body by a driving means, and a pressing means linked to the pressing body.

[0007]

The present invention configured as described above has the following effects. When the leading conductor in which the pressing means and the driving means are linked to the ground to be buried is installed horizontally, and the pressing means is operated to push the pressing body, the leading conductor is contacted via a sphere with which the front end abuts. Consolidation is promoted horizontally into the ground.

[0008] With this propulsion, earth pressure is applied to the spiral blade, and the insertion of the leading conductor proceeds while rotating in a predetermined direction using the outer periphery of the pressing body as a bearing.

[0009] While the ground in front of the leading conductor is in normal geology, it is propelled by the pressing of the pressing means while maintaining the straight running accuracy smoothly. When the driving means is operated in a state where the propulsion of the leading conductor by the pressing means is temporarily stopped because the intubation is hindered, a large impact force is given to the hitting body, and the pressing body connected to the hitting body is led through the sphere. Since the striking force is transmitted to the body, the tip conductor crushes the obstacle hitting the body until it can be intubated.

[0010] Then, when the tip conductor is advanced by operating the pressing means, the intubation is resumed again, whereby the tip conductor is propelled with a high degree of straightness without shifting the desired direction.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a ground drilling apparatus according to the present invention.

In FIG. 1 and FIG. 2, reference numeral A denotes a ground drilling device, which is a construction work for water supply / drainage facilities for burying underground and a work for laying a buried pipe b having a relatively small diameter (pipe diameter 70 to 300 mm) for telephone, electricity, gas and the like. In this method, a buried pipe b connected to a predetermined length with an embedding hole c formed in the ground is laid.
, The pressing body 3, the hitting body 4, the pressing means 5, and the driving means 6.

The above-mentioned leading conductor 1 is formed in a cylindrical shape having a hollow cavity 7 inside, and a plurality of, for example, three spiral blades 8 are radially projected at an outer peripheral side thereof at intervals. The trajectory of the rotating outer diameter of each of the spiral blades 8 is substantially the same as the buried pipe b, and a crushing blade 8a such as a carbide tip is implanted at the tip of the spiral blade 8. Sometimes.

It is preferable that the tip of the spiral blade 8 is formed so as to have a predetermined C-shape in which the outer peripheral edge protrudes forward. The crushing blade 8a digs in, and the obstacle is efficiently crushed.

The sphere 2 has a concave portion 9 provided at the front end of the hollow portion 7 in the front conductor 1 and a concave portion 10 at the front end of the pressing body 3 which will be described later and inserted into the front conductor 1. This force is transmitted to the leading conductor 1 in response to the pressing of the pressing body 3, and the leading conductor 1 is smoothly rotated.

The pressing body 3 has a cylindrical shape having a hollow portion 11 therein, and is formed so as to substantially coincide with the inner diameter of the hollow portion 7 in the leading conductor 1. It is movably inserted and provided until the concave portion 10 at the front edge thereof comes into contact with the spherical body 2 and is divided into a front head 3a and a main body 3b, and the front head 3a is formed as described above. A concave portion 10 having an arc surface corresponding to the outer shape of the spherical body 2 is formed at the distal end thereof, and a receiving surface 3c with which the distal end of the striking body 4 described below comes into contact is provided in front of the hollow portion 11 inside.

The main body 3b is connected to the rear edge of the forehead 3a, and has a rear portion protruding from the leading conductor 1, and is formed at an intermediate portion. Shock absorbing and pressurizing coil spring 12 is externally provided on step 3d,
The rear edge of the pressing body 3 is adjusted by adjusting the normal pressing force of the pressing body 3 by abutting an adjusting screw 14 which is screwed to a screw 13 for screwing the edge to the inner periphery of the leading conductor 1.

Although the pressing body 3 is not shown, the forehead 3a and the main body 3b may be integrally formed. When severe damage is caused by these, these are formed into two parts and this forehead 3a
It is preferable that the front head 3a is engaged with the rear main body 3b, and as shown in FIGS. 3 (a) and 3 (b), In some cases, a structure may be employed in which engagement is made with the engaging portions 15 and 16 extending to either one of the portions 3b.

The rear part of the pressing body 3 is supported at its outer periphery by a mounting tube 18 fixed by screws or the like to the front part of an intermediate cylindrical body 17 connected to the pressing means 5 described later.
The rear edge of the pressing body 3 is brought into contact with the flange 19 of the mounting pipe 18,
The pressing force of the pressing means 5 is transmitted.

The hitting body 4 is formed in a hard and rigid rod shape, and is inserted into a hollow portion 11 provided in the pressing body 3 so as to be able to advance and retreat, and the driving body 6 pushes the pressing body 3. The front end is in contact with the receiving surface 3c of the pressing body 3.

The driving means 6 for driving the striking body 4 uses pressurized air, and the supply and exhaust of the striking body 4 are continuously and appropriately repeated by a valve (not shown) inscribed in the tubular body 20, and By applying pressurized air to the piston 21 which is in contact with the rear end of the body 4, 150 to 20
By the reciprocation of 0 mm, the crushing blade 8a of the spiral blade 8 in the tip conductor 1 at the forefront moves horizontally back and forth, and crushes obstacles in front of it, such as concrete blocks, piles, rocks, etc., and straightens the tube. Enable.

The pressing means 5 uses a hydraulic cylinder 22 that utilizes pressurized oil generated by a hydraulic unit (not shown). The frame 24 is mounted horizontally on a frame 24 supported by 23, and the frame 24 is firmly installed in a starting pit 25 dug in the ground, and a hydraulic pressure that moves forward and backward by pressurized oil from the hydraulic unit. Rod 26 of cylinder 22
The pressing body 3 is attached to the tip via a pressing plate 27.

A buried pipe b to be laid underground is attached between the pressing body 3 and the pressing plate 27.
When the extension amount of the rod 26 reaches the limit, the next buried pipe b
Are sequentially connected to a predetermined length while being connected.

The lubricating oil is sealed in the tip conductor 1. The lubricating oil prevents the sphere 2, the pressing body 3, the striking body 4 and the like from being seized.
The front body 3a and the main body 3b of the pressing body 3 are provided with a plurality of mutually communicating oil holes 28 at a plurality of locations so that smooth sliding can be performed. Oil seal rings 29 and 30 for sealing the contact portions between the leading conductor 1, the mounting pipe 18, and the flange 19 of the mounting pipe 18 and the impacting body 4 are respectively provided.

In FIG. 1, reference numeral 31 designates a coil spring disposed at the front edge of the support cylinder 32 of the piston 21 provided in the intermediate cylinder 17 and at the rear edge of the mounting pipe 18 to absorb impact upon impact. The support cylinder 32 is connected to the cylinder 20 so that the pneumatic pressure of the driving means 6 is actuated to the piston 21. .

Next, the operation of the apparatus A according to the embodiment of the present invention will be described.

For example, when laying a buried pipe b which is a pipe (outer diameter 68 mm, length 480 mm) in plumbing work or the like, it is necessary to install the buried pipe b at the start end and end end beforehand on the ground. The starting pit 25 and the arrival pit (not shown) are excavated, and the frame 24 to which the hydraulic cylinder 22 of the pressing means 5 is attached is inserted into the starting pit 25 and its rod 26
After the supporting legs 23 are adjusted so that the feeding direction of the supporting members 23 becomes horizontal, the supporting members 23 are firmly installed.

A pressure plate 27 is attached to the tip of the rod 26, a first buried tube b is attached, and a spherical body 2, a pressing body 3, and a striking body 4 are built in the front part of the intermediate cylindrical body 17. When 1 is fixed, the tube b is ready for embedding.

Next, the hydraulic cylinder 22 in the pressing means 5
When the rod 26 is extended by operating the pressing member 3, the pressing body 3 is moved to 300 to 700 kg / cm ² via the pressing plate 27, the buried pipe b, and the intermediate cylindrical body 17.
Of the forehead 3a.
Presses the leading conductor 1 through the sphere 2,
The leading conductor 1 is horizontally pressed into the ground.

With this propulsion, earth pressure is applied to the peripheral surface of the spiral blade 8, and the leading conductor 1 advances straight insertion while rotating in a predetermined direction using the outer periphery of the pressing body 3 as a bearing.

While the ground in front of the leading conductor 1 is in normal geology, the hydraulic cylinder 22 is pressed to propel the soil while cutting the soil by the rotation of the spiral blade 8 while maintaining the straight running accuracy. When an obstacle such as a concrete block or a pile appears in front of it, the crushing blade 8a of the spiral blade 8 hits the obstacle, and a load (confirmed by a meter gauge or the like) is applied to the pressing of the hydraulic cylinder 22. Since this intubation is obstructed, the lubrication is stopped or the propulsion force is released from the relief valve to reduce the propulsion force, and the propulsion of the leading conductor 1 by the hydraulic cylinder 22 is temporarily stopped, and this position is maintained.

When the air driving means 6 is operated, pressurized air is applied to the piston 21 provided in the support cylinder 32, and the switching of the pressurized air causes the piston 21 to advance and retreat at a predetermined stroke. Hitting body 4 connected to
Strikes the receiving surface 3c of the forehead 3a of the pressing body 3.

Accordingly, the concave portion 10 of the forehead 3a is
Impact on the concave portion 9 of the leading conductor 1 through the inner conductor, the crushing blade 8a of the spiral blade 8 protruding from the outer periphery of the leading conductor 1 gradually crushes the obstacle, and crushes to a state where intubation is possible.

When the pressure of the hydraulic pressure applied by the pressing means 3 is reduced, when the normal oil supply to the hydraulic cylinder 22 is started again, the leading conductor 1 is propelled and the intubation is restarted. The propulsion is performed with a high degree of straightness without deviating from the desired direction, and the buried pipe b is laid by a straight line set up to the reaching depth.

[0035]

As described above, the ground drilling device of the present invention can be used in any case, from the relatively soft ground for propulsion only to the abnormal ground where obstacles appear in front of the propulsion due to the rotation of the spiral blade in the leading conductor. Even in this case, it is possible to lay a buried pipe with a highly accurate intubation direction.

In addition, the propulsion speed is improved by applying the impact to the leading conductor while applying an impact, and the construction period of the buried pipe is greatly reduced. And so on.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a main part of a ground drilling device according to the present invention.

FIG. 2 is an explanatory view showing an intubation state by the device in FIG.

FIG. 3 is a partial cross-sectional view showing another example of the pressing body in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead conductor 2 Sphere 3 Pressing body 4 Hitting body 5 Pressing means 6 Driving means 8 Spiral blade 9 Recess

Claims (1)

(57) [Claims] 1. A cylindrical leading conductor having a hollow inside and a plurality of spiral blades radially protruding from an outer peripheral side thereof, and a sphere that can be accommodated in a concave portion provided at a front end in the leading conductor. A pressing body of the front conductor whose front edge abuts the sphere and is slidably inserted into the front conductor, and is inserted into the hollow portion provided in the pressing body so as to be able to advance and retreat, and the driving means presses the pressing body. A ground drilling device, comprising: a striking body for manipulating a body; and pressing means linked to the pressing body.