JPH06102960B2 - Pilot shaft drilling head for pipe digging equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 1) Industrial Field of the Invention The present invention relatively provides small diameter pipes for gas, water and sewerage, telegraph and telephone cables, etc. under the roads, railroad lines, building structures and other obstacles. In a pipe burial digging device that is buried over a long distance, the required span for burying the pipe, for example, between the start pit and the arrival pit, is attached to the tip of the pilot shaft to pierce the pilot pit first. It relates to the drilling head used.

2) Prerequisite technology of the present invention The applicant previously filed a patent application on December 17, 1986 for "Excavation device for pipe burying and excavation by the excavation device, pipe burying method". (Patent application No. 300519 in 1986) The excavation device for burying a pipe includes a thrust bearing 1 attached to a hydraulic cylinder device B, one or more pilot shafts 2, an excavation die 3, and one or more screw shafts 4. And the one around it
The above-mentioned discharge pipes 5 and the driving device 6 attached to the hydraulic cylinder device A are removably connected and installed on the same axis 1 in the above-mentioned order, and the excavating device is used. Excavation and pipe embedding methods (actions) are as follows.

(1) ... Pilot shaft 2 equipped with hydraulic cylinder devices A and B at both ends of a required span where pipes are buried, for example, a start pit and a destination pit, and a drilling head C at the tip is rotationally driven by a prime mover 6. Then, it is pressed by the hydraulic cylinder device A, and the pilot shaft 2 is connected in sequence to excavate and propel, and one or more connected pilot shafts 2 penetrate the pilot shaft to the required span. 9 is removed, the shaft end is connected to the thrust bearing 1 (mounted on the hydraulic cylinder device B), the drilling die 3, the screw shaft 4, and the discharge pipe 5 around it are provided at the rear end of the pilot shaft 2 to which at least one is connected. , And the rear end of the screw shaft 4 is connected to the prime mover 6. (3) ... Due to the action of the speed difference (A <B) between the hydraulic cylinder devices A and B, the thrust bearing 1 and the prime mover 6 (that is, One or more connected in series While maintaining a constant tension on each of the members 2, 3 and 4 on the same axis 1 by constantly applying a tension of a set value to the ilot shaft 2, the excavating die 3, and the one or more screw shafts 4), ) ... Each member 2, 3 and 4 is rotated by the prime mover 6, pressed by the hydraulic cylinder device A and pulled by the hydraulic cylinder device B, and high-pressure water is discharged from the screw shaft 4, and then the excavation die 3 propels it. Then, the mud-like soil is discharged to the outside of the excavation pit 11 (buried pipe 10) by the screw shaft 4 and the discharge pipe 5, (5) ... As the excavation progresses, the pilot shaft 2 is sequentially removed, and the screw shaft 4 is correspondingly removed. And the discharge pipe 5 are connected, and (6) ... Further, the hydraulic cylinder device A pushes the buried pipes 11 one after another into the excavation pit 10 to bury them.

1) Structure of the Present Invention The present invention is therefore an excavation head attached to the tip of a pilot shaft and used for excavating a pilot pit in the above pipe digging device.

Hereinafter, the structure will be described with reference to Examples. (1) ... Thrust bearing 1 attached to hydraulic cylinder device B
And one or more pilot shafts 2, drilling dies 3 and 1
A plurality of screw shafts 4 and one or more discharge pipes 5 around them, and a driving device 6 attached to the hydraulic cylinder device A,
The excavation head C is attached to the tip of the bilot shaft 2 of the excavation device for burying pipes, which is detachably connected and installed on the same axis in the order described above. The excavation head C includes the cylinder 7, the piston 8, and the die. 9
The piston 8 is installed in the air chamber 10 having the inner diameter of the cylinder 7, and the base portion 9a of the die 9 is fitted in front of the piston 8. The air chamber 10 is provided with a supply port through the thick portion of the cylinder. The exhaust port 12 communicates with the exhaust port 12, and the piston 8 is provided with an exhaust hole 13 communicating from the rear end surface to the front side surface and a flange surface 14 on the rear peripheral surface.

(2) The die 9 has, for example, a base 9a mounted on the inner diameter of the tip of the cylinder 7 so as to be slidable back and forth by a support shaft 15, and a front surface of a head 9b having a large number of blades 16 protruding therefrom. It is formed by sloping at a set angle.

(3) ... The air chamber 10 includes, for example, a rear air storage unit 10a and an air supply port 1
Pressurizing part 10b with 1 open, exhaust part 10c with exhaust port 12 open
Also, a partition wall 10d between the pressurizing section 10b and the exhaust section 10c is provided.

(4) Further, for example, in the gap between the tip of the cylinder 7 and the head portion 9b of the die fitted therein, an elastic backing 17 made of rubber, silicon or the like for compression and vibration is compressed and brought into close contact. It is fitted and provided so that muddy water or the like does not enter the fitting sliding portion between the die 9 and the cylinder 7.

By fitting the iron ring 18 on the outer peripheral surface of the elastic packing 17, the compression packing state of the elastic packing can be firmly held.

(5) Further, for example, as shown in FIG. 3, a spiral groove 19 is engraved on the outer peripheral surfaces of the cylinder 7 and the die 9 to form the die 9
It will be installed so that soil excavated by will be transported backwards by a spiral groove.

(6) ... Then, the excavating head C configured as described above.
Is attached to the tip of the pilot shaft 2 of the pipe digging device so as to be freely detachable.

4) ... Operation (1) ... Necessary span for burying pipe, for example, between the starting pit and the reaching pit, when initially excavating the pilot pit in a correct straight line, the hydraulic cylinder device A in the starting pit
The pilot shaft 2 is attached to the prime mover 6 installed in, and the drilling head C of the present invention is attached to the tip of the pilot shaft 2.
It is rotated by the prime mover 6 and is pushed forward by the hydraulic cylinder device A.

Further, compressed air is constantly supplied to the air supply port 11 of the excavating head C through the pilot shaft 2.

(2) ... In FIG. 1, the pressurizing section from the air supply port 11 to the air chamber 10
The compressed air entering 10b presses the flange surface 14 of the piston 8 to move the piston to the right (in the direction of the air storage portion 10a), and at the same time, the exhaust hole 13 of the piston 8 is closed by the partition wall 10d. The air in the air storage unit 10a is compressed.

(3) The compressed air in the air supply port 11 flows from the pressurizing portion through the exhaust hole 13 into the air storing portion 10a at the moment when the exhaust hole 13 reaches the pressurizing portion 10b by the subsequent movement of the piston 8. At the same time, the compressed air adds to the compressed air that has been stored in the air storage portion 10a up to then, and strongly presses the rear end surface of the piston 8. (FIG. 2) At this time, the compressed air of the pressurizing portion 10b also presses the flange surface 14 at the same time, but the synergistic pressing force applied to the piston rear end surface is much larger than this pressing force. The piston 8 instantly moves to the left, and its tip collides with the base portion 9a of the die 9 to give a strong impact.

(4) ... As described above, when the piston 8 moves to the left,
The exhaust hole 13 reaches the exhaust portion 10c beyond the partition wall 10d, so that the compressed air in the air storage portion 10a and the exhaust hole 13 is exhausted to the exhaust port 12. (Returning to the state of FIG. 1) (5) Then, returning to the state of the above (2),
Since the same action is repeated cyclically at an extremely high speed, the piston 8 continuously gives an impact to the die 9, and powerful rock drilling and drilling action is performed by the die 9, rotation of the drilling head C, and pushing forward force. In tandem with this, the pilot pit excavation will be performed extremely effectively.

5) ... Effect (1) ... In the above configuration and operation, when the excavating head of the present invention penetrates the pilot shaft for a required span to excavate the pilot pit, the hydraulic cylinder device pushes forward.
Simultaneously with the rotational drive by the prime mover, due to the high-speed forward and backward movement of the piston and the strong continuous impact of the die (continuous impact similar to high-speed vibration), it is possible not only to change the soil quality, but also to change the soil quality such as rock and sand. However, it has the excellent feature that even hard rock can be easily crushed with a die, excavated, pushed, pushed away, and advanced.

(2) ... Because the front of the die has a tilt angle,
Along with continuous impact, rock crushing, pushing of soil, gravel, etc., pushing action, and action of moving straight in the pushing direction are effectively performed.In particular, as described above, the die pushes and rotates while moving forward, The advance control is more accurate, so that the drilling head and pilot pipe can travel straight exactly to drill a straight pilot pit.

(3) In addition, the elastic packing is compression-fitted between the die and the front end of the cylinder, so that the slidable portion of the die and the cylinder, the piston sliding portion inward of the die, and the like can be muddy by excavation. It can eliminate the risk of infiltration of soil and soil.

By fitting the iron ring to the outer peripheral surface of the elastic packing,
It is possible to protect the packing and firmly hold the compression contact state.

(4) Further, if a spiral groove is formed on the outer peripheral surfaces of the die and the cylinder, soil excavated by the die can be efficiently transferred backward by the spiral groove, and the forward movement of the excavating head can be assisted. There are advantages.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an embodiment of a drilling head of the present invention, FIG.
FIG. 3 is a vertical sectional front view of the piston retracted, FIG. 3 is a front view of an embodiment in which a spiral groove is formed on the outer peripheral surfaces of the cylinder and the die, and FIG. Is. No., A ... Hydraulic cylinder device (for pressing), B ... Hydraulic cylinder device (for pulling), C ... Excavation head of the present invention, 1 ...
Same axis, 1 ... Thrust bearing, 2 ... Pilot shaft, 3 ... Excavation die, 4 ... Screw shaft, 5 ... Discharge pipe, 6 ... Prime mover, 7 ... Cylinder, 8 ... Piston, 9 …… Die, 9a …… Base, 9b …… Head, 10 …… Air chamber, 10a …… Air storage part, 10b …… Pressurizing part, 10c …… Exhaust part, 10d …… Partition wall, 1
1 ... Air inlet, 12 ... Exhaust port, 13 ... Exhaust hole, 14 ... Flange surface, 15 ... Spindle, 16 ... Blade, 17 ... Elastic packing, 18 ... Iron ring, 19 ... Spiral groove.

Claims (5)

[Claims] 1. A thrust bearing mounted on a hydraulic cylinder device, one or more pilot shafts, a drilling die, one or more screw shafts, and one or more discharge pipes around the screw shafts.
A excavation head attached to the tip of a pilot shaft of a pipe burial excavator configured by detachably connecting and installing a prime mover attached to a hydraulic cylinder device on the same axis in the order described above. It consists of a cylinder, a piston and a die, and the piston is installed in the air chamber inside the cylinder.
The base of the die is fitted in front of the piston, and the air supply chamber and the exhaust port communicate with each other.
An excavating head for a pilot shaft of a pipe digging device, which has an exhaust hole communicating from the rear end face to the front side face and a flange face on the rear peripheral face. 2. A die has a base at an inner diameter of a cylinder tip,
It is mounted so that it can slide back and forth from the spindle to the set dimensions.
The excavating head for a pilot shaft of a pipe digging device according to claim 1, wherein a front surface of the head having a large number of blades projecting from the head is inclined at a set angle. 3. An air chamber is provided with a rear air storage section, a pressurizing section with an air supply opening, an exhaust section with an exhaust opening, and a partition wall between the pressurizing section and the exhaust section. An excavation head for a pilot shaft of a pipe digging device according to claim 1. 4. A pilot for a pipe digging device according to claim 1, wherein an elastic packing is fitted in a compression close contact state in a gap between the tip of the cylinder and the head of the die fitted therein. Drilling head for shaft. 5. A drilling head for a pilot shaft of a pipe burring device according to claim 1, wherein spiral grooves are formed on the outer peripheral surfaces of the cylinder and the die.