JPS6043491B2 - Pile driving device using earth auger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pile driving device that uses an earth auger, and in particular, it is an object of the present invention to provide a new pile driving device that has low pile driving noise and a high pile driving speed.

BACKGROUND OF THE INVENTION In recent years, auger cranes have been used for various types of construction work, and various types of work are performed using the rotational driving force of a hydraulic motor provided at the end of a working arm of the auger crane.

The present invention is a new pile driving device using rotational drive by the hydraulic motor of the auger crane, which can be attached to the end of the auger shaft extending from the rotating shaft of the hydraulic motor to easily drive various piles. It is.

Now, one embodiment of the pile driving device using the earth auger of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the pile driving device, and FIGS. 2 a and 2 b are front views showing the same state of use. Fig. 3 is a partially cutaway sectional view of the main part when the hammer is at the lower limit position, Fig. 4 is a partially cutaway sectional view of the main part when the hammer is at the upper limit position, and Fig. 5 is the cam plate installation. FIG. 6 is an exploded perspective view of the portion, and both a and b are explanatory diagrams showing the functions of the cam surface and the cam operating pin.

Reference numeral 1 denotes a substantially cylindrical hammer having sufficient self-weight necessary for driving piles, and an automatic lifting mechanism 2 is provided on one side of the hammer 1.

Reference numeral 3 denotes a rotary shaft that is sufficiently longer than the length of the hammer 1, and a disk-shaped hammer receiver 5 having a diameter smaller than that of the flange 4 is provided on the upper surface of a flange 4 fixed to or integrally formed with the lower end of the rotary shaft 3. As well as being formed,
A boss 7 having an impact transmission protrusion 6 protruding from the lower shaft center is integrally formed.

A coil rail 8 having a large spring constant is closely fitted onto the rotating shaft 3, and its lower end abuts against a coil receiver 9 formed on the upper surface of the hammer receiver 5.
Sliding is prevented by a fixing bolt 10 protruding from one side of the lower part of. Reference numeral 11 denotes a cam actuating pin that moves toward and away from the automatic lifting mechanism 2, and is slidably inserted into a shaft hole 12 bored in the axial direction around the periphery of the flange 4 so that its upper end projects. Tail plug 1 screwing the shaft hole 12 into the lower end surface
A coil spring 14 is elastically mounted between the cam actuating pin 11 and the cam actuating pin 11, and is elastically biased in a direction protruding from the flange 4 surface.

The rotating shaft 3 has a small diameter portion 15 formed at its upper end rotatably inserted into a bearing bush 18 fixed to the end of an upper bracket 17 protruding from one side of the upper end of the guide vibe 16, so that the upper end thereof protrudes. , a boss 7 formed at the lower end
is rotatably fitted into a bearing receiver 20 fixed to an end of a lower bracket 19 protruding from one side of the lower end of the guide vibe 16.

A thrust-shaped bearing 23 is inserted into the bearing recess 21 of the bearing receiver 20 via an annular buffer rubber 22 provided on the bottom of the recess, and the impact transmission protrusion 6 is inserted into the inner ring of the bearing 23. The impact transmission protrusion 6 is connected to the bearing recess 2
1 Shock receiver 24 protruding from the center of the bottom and the buffer rubber 22
Due to their elasticity, they are positioned opposite each other with a slight gap D between them.

Further, reference numeral 25 denotes a handle fixed to one side of the guide vibrator 16. The hammer 1 has a shaft hole 26 bored approximately in its axial center and is slidably inserted into the coil rail 8 of the rotary shaft 3, and a guide groove 27 formed in the axial direction on one side is inserted into the guide vibe 16. The hammer 1 is slidably engaged with the rotary shaft 3 to prevent the hammer 1 from following rotation with respect to the rotary shaft 3.

The automatic lifting mechanism 2 has a steel ball loose fitting hole 28a opened at the surface of the shaft hole 26 at the inner end of the pin sliding hole 28 bored on one side of the hammer 1, and the copper ball loose fitting hole 28a. Then, a steel ball 29 that comes out and retracts from the surface of the shaft hole 26 is inserted, and a throttle hole portion 28b that follows the curved surface of the steel ball 29 is formed on the shaft hole 26 surface side of the steel ball loose fitting hole 28a. In order to prevent the ball 29 from falling off, a push pin 31 elastically biased in a retreating direction by a coil spring 30 is brought into contact with the rear end of the steel ball 29 and slidably inserted, and the end of the pin sliding hole 28 is The stop bolt 32 screwed into the stop bolt 32 prevents removal.

Further, the rear end of the push pin 31 is connected via a pin shaft 36 to the upper ends of push arms 35, 35 which are swingably pivoted to the lower end of a step 33 provided on one side of the hammer 1 via a pin shaft 34. A cam plate 38 is pivotally mounted between the lower ends of both the arms 35, 35 via a pin shaft 37.

As shown in FIG. 6, the cam plate 38 has a cam surface 39 that engages with the cam operating pin 11 and is pushed radially outward, and the cam surface 39 side is slightly lowered via a tension spring 40. It is elastically supported at an angle.

41 is a lock pin slidably inserted into a cylinder hole 42 drilled from the upper surface of the hammer 1 of the stepped portion 33; 44, and forms an oil chamber 45 in the lower part, and is always elastically biased downward by a coil spring 46 held by a bearing bolt 49 screwed into the hole end. The shaft-sealed engaging end 47 is engaged with the rear step portion 48 of the push pin 31 to maintain the protruding position of the steel ball 29, or the engagement is released and the steel plate 29 is retreated from the surface of the shaft hole 26. urge

Reference numeral 51 denotes a hydraulic operation hole bored parallel to the cylinder hole 42, and a lock release pin 53 whose upper end protrudes from a bearing bolt 52 screwed into the hole end is inserted into the hydraulic operation hole 51. A piston 54 formed at the end is inserted airtightly and slidably through an O-ring 55 to form an oil chamber 56 in the lower part, and is also connected to the cylinder hole 42 through a communication hole 57.
The oil chamber 45 communicates with the oil chamber 45, and after being filled with hydraulic oil from an oil connection port 58, a sealing plug 59 is formed.

60 is a bush 18 integrated with the guide vibe 16
It is a pin extrusion protrusion protruding from the end, and when the hammer 1 reaches the upper limit of upward movement, it hits the upper end of the lock release pin 53,
This will push it down.

61 is an auger shaft receiver 62 having a square shaft hole connected to the lower end of an auger shaft C connected to a rotating shaft such as a hydraulic motor B provided at the end of the working arm A of the auger crane.
is a square vibe shaft fixed to the upper end, and the square vibe shaft 61
A conductive vibrator 63 having a rectangular shaft shape is slidably inserted from the lower end thereof, and the lower end of the conductive vibrator 63 is connected to a small diameter portion formed at the upper end of the rotating shaft 3. A shaped joint portion 64 is formed.

Further, a pile attachment 65 is integrally formed at the lower end of the bearing receiver 20, and has a pile head fitting hole 66, which loosely fits into the head of each type of pile E. The pile driving device of the present invention has the above-mentioned configuration, and its operation and effects will be explained next.

The hydraulic motor B installed at the end of the working arm A of the auger crane can be rotated in a desired direction, but when the present invention is carried out, it is used by rotating in one direction as shown in Fig. 6. It is something to do.

First, as shown in FIG. 2, the auger shaft receiver 62 is fastened to the lower end of the auger shaft C to connect the pile driving device, and the working arm A end is lowered so that the pile E fits into the lower surface of the pile attachment 65. Hold the top of pile E in the driving position.
At this time, the height of the end of the working arm A is adjusted so that the conductive vibrator 63 is fully inserted into the square vibrator shaft 61.

In the pile driving operation, the hammer 1 is automatically raised by the worker grasping the handle 25 in the above state, or driving the hydraulic motor B while engaging with any fixed part so that the part does not rotate. There is also a free fall and repeating this to drive the pile E. That is, the rotary shaft 3 is rotationally driven by the hydraulic motor B via the square vibrator shaft 61 and the transmission vibrator 63, and the coil rail 8 is also rotated.

However, since the hammer 1 is prevented from rotating by engaging the guide groove 27 with the guide vibe 16, when the push pin 31 of the automatic lifting mechanism 2 is in the pushed state as shown in FIG. The steel ball 29 protruding from the surface of the shaft hole 26 by the push pin 31 engages with the coil rail 8, and is pushed up by the screwing action, so that the entire hammer 1 rises. When the hammer 1 reaches the upper limit of its stroke, the pin extrusion protrusion 60 hits the upper end of the lock release pin 53, and in order to push it down, the hydraulic oil in the oil chamber 56 flows through the communication hole 57 to the oil chamber 45 in the cylinder hole 42. and pushes up the piston 43 against the elasticity of the coil spring 46.

This action causes the lock pin 41 to retreat from the rear step portion 48 of the push pin 31, the push pin 31 is pushed back by the elasticity of the coil spring 30, and the engagement between the steel ball 29 and the coil rail 8 is released.

Therefore, the hammer 1 including the automatic lifting mechanism 2 falls due to its own weight, and at the same time the lower surface of the hammer 1 collides with the hammer receiver 5, an impact load is applied to the impact transmission protrusion 6 via the flange 4 and the boss 7.

This load crushes the buffer rubber 22 and eliminates the gap D, and the 6 ends of the impact transmission protrusion forcefully hit the impact receiver 24, driving the pile E through the pile attachment 65.

While the hammer 1 is falling due to its own weight, the rotary shaft 3 continues to rotate, so when the hammer 1 reaches the lower limit of its stroke, the cam plate 38 of the automatic lifting mechanism 2 engages the cam operating pin 11 of the flange 4. become engaged.

When the cam operating pin 11 slides into contact with the cam surface 39, the arm 35
, 35 swing around the central pin shaft 34, pushing the push pin 31 inward against the elasticity of the coil spring 30, and the push pin 31 forces the steel ball 29 into the shaft hole again. It protrudes from 26 sides.

At this time, the lock pin 41 is pushed back and engaged with the rear step portion 48 of the push pin 31 due to the elasticity of the coil spring 46, so that the push pin 31 is locked at the position (with the push pin 31 pushed inward). Become.

Therefore, as the coil rail 8 rotates, the hammer 1 engages with the steel ball 29 and rises again, and the pile E is driven in while repeating this process.

In addition, when the hammer 1 is repeatedly raised and lowered, if the lower surface of the cam plate 38 of the automatic lifting mechanism 2 is located on the cam operating pin 11 when the hammer 1 falls to the lower limit position, the cam plate 38 is placed on the pin. Since it is pivotably attached to the shaft 37 and is elastically supported by the tension spring 40, the force actuating pin 11 is also tilted upward by the coil spring 14 at the same time as the cam surface 39 side is tilted upward. Since it is elastically biased, it retreats inward in the shaft hole 12 due to the collision of the cam plate 38, and after the collision between the two is buffered and the flange 4 rotates about one rotation, the cam actuating pin 11 force is released. The hammer 1 presses the cam surface 39 of the plate 38.
is forced to rise. As described above, as the driving progresses, the head of the pile E becomes lower, but since the conductive vibrator 63 is slidably inserted into the square vibrator shaft 61, it follows this and descends. Yes, the pile attachment 65 and the head of the pile E are never separated. In addition, since a cushioning rubber 22 is installed in the bearing recess 21 of the bearing receiver 20, the impact transmission protrusion 6 and the impact receiver 24 are separated by a gap D apart from each other except during a downward collision of the hammer, and the rotating shaft 3 rotates smoothly. It will be done.

As explained above, the pile driving device according to the present invention automatically raises and lowers the hammer using the rotary driving force of the earth auger, and does not require a separate dedicated drive source, so it has a simple structure, is hard to break, and can be manufactured at low cost. Since it utilizes a powerful hydraulic motor installed on the auger crane, its range of applications is far greater than that of conventional portable pile driving equipment, and its advantages are far greater.

[Brief explanation of the drawing]

The drawings relate to a pile driving device that uses the earth auger of the present invention, and Fig. 1 is an exploded perspective view, Fig. 2 is a front view showing the state when A and B are used together, and Fig. 3 shows the hammer at the lower limit position. Figure 4 is a partially cutaway sectional view of the main part when the hammer is at the upper limit position, Figure 5 is an exploded perspective view of the cam plate attachment part, Figure 6 is Both A and B are explanatory diagrams showing the relationship between the cam surface and the cam operating pin. 1-hammer, 2-automatic lifting mechanism, 3-rotating shaft,
5-Hammer receiver, 6-Impact transmission butt, 8-Coil rail, 11-Cam operating pin, 14, 30, 46-Coil spring, 16-Guide vibe, 18-Bush, 20-
Bearing receiver, 22 ~ buffer rubber, 23 ~ bearing,
24~Shock receiver, 25~Handle, 27~Guide groove, 29~
Steel ball, 31 ~ push pin, 35 ~ arm, 38 ~ cam plate, 4
1 - lock pin, 45, 56 - oil chamber, 53 - lock release pin, 57 - communication hole, 60 - pin extrusion projection, 61 - square vibe shaft, 63 - conduction vibe, A - working arm of auger crane, B - Hydraulic motor, C ~ auger shaft, D ~ gap,
E~Pile.

Claims (1)

[Scope of Claims] 1. A pile attachment is formed in which a pile head is loosely fitted to the lower end of a hammer receiver configured at the lower end of a rotary shaft that is rotatably connected to the lower end of an auger shaft of an earth auger, and the rotary shaft is slidably and rotatably connected to the rotary shaft. In addition to constructing a blocked coil rail,
A hammer slidably fitted onto the coil rail is slidably engaged with a guide pipe installed on the upper and lower ends of a rotary shaft, and an engaging end protruding and retracting from the shaft hole surface of the hammer is inserted into the coil rail. an automatic lifting mechanism that engages or disengages the hammer, an engaging end of the automatic lifting mechanism is protruded at the lower stroke limit of the hammer, and the engaging end is retracted at the upper stroke limit to move the hammer continuously along the rotating shaft. A piling device that uses an earth auger that moves up and down and drives piles using the impact load caused by the fall of the hammer's own weight. 2. A patent characterized in that the above-mentioned automatic elevating mechanism comprises a push pin that is moved in and out by a cam mechanism and a hydraulic mechanism, and a lock pin that engages and disengages from the rear end of the push pin, and a lock release pin that causes the lock pin to retreat. A pile driving device using the earth auger according to claim 1.