JPS5898522A - Pile driving device utilizing earth auger - Google Patents

Abstract

PURPOSE:To accelerate a pile-driving speed, by a method wherein a rotary shaft, which a coil shaft engages, is connected to a lower end of an auger shaft, the rotation of the shaft lifts a hammer mating the outside thereof, and the hammer falls under its own weight at an upper limit. CONSTITUTION:A pile E is attached to a lower end of an earth auger through a rotary shaft 3. If, with a motor for an earth auger run in a condition of an operator while gripping a handle a coil rail engaging the shaft 3 rotates, too. In this case, the hammer 1 is free of rotation as a result of the engagement of a guide 26 with a guide groove 27, whereby a steel ball 29, emerging from an axial hole 26 surface through the force of a push pin 31, engages the rail 8, and is pushed upward by a push pin 31. If the hammer 1 reaches an upper limit, a pushing projection 60 makes contact with an upper end of a lock-releasing pin 53 to push it down, an oil pressure in a hydraulic chamber 56 pushes upward a piston 43, a lock pin 41 is unlocked, the steel ball 29 moves backward, and the hammer 1 falls to strike a blow on the pile E.

Description

[Detailed Description of the Invention] The present invention relates to a pile driving device that uses an earth auger, and particularly aims to provide a new pile driving device that has low pile driving noise and high pile driving speed. .

2. Description of the Related Art 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 rotation axis 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, FIGS. 2 a and 2 b are front views showing the same state of use, Figure 6 is a partially cutaway sectional view of the main part when the hammer is 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, and Figure 5 is a partially cutaway view of the main part when the hammer is at the upper limit position. FIGS. 6A and 6B are explanatory diagrams showing the relationship between 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.

The shaft is a rotary shaft that is sufficiently longer than the length of the hammer 1, and the upper surface of a flange 4 fixed to or integrally formed with the lower end of the rotary shaft 3 has a disk-shaped hammer receiver 5 having a diameter smaller than that of the flange 4. At the same time, a boss 7 having an impact transmission member 6 protruding from the lower shaft center is integrally formed.

Further, a coil rail 8 with a large spring constant is closely fitted onto the rotating shaft B, and its lower end abuts against a coil receiver 9 formed on the upper surface of the thermometer receiver 5, and is protruded from the lower side of the rotating shaft 3. The locking bolt 10 prevents sliding.

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.
A coil/spring 14 is elastically loaded between the tail plug 13 screwed into the lower end surface of the shaft hole 12 and the cam actuating pin 11, and is elastically biased in a direction protruding from the flange 4 surface.

The rotating shaft 6 has a small diameter portion 15 formed at its upper end rotatably inserted into a bearing bushing 18 fixed to the end of an upper bracket 17 protruding from the upper end of the guide pipe 16, and the upper end thereof is projected. , Post 7 formed at the bottom end
is rotatably fitted into a bearing receiver 20 fixed to an end of a lower bracket 19 protruding from the lower end of the guide pipe 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 a shock transmission mechanism 6 is inserted into the inner ring of the bearing 23, and The shock transmission beauty 6 is the bearing recess 2
1 Shock receiver 24 protruding from the center of the bottom and the buffer rubber 22
Due to zero elasticity, they are positioned opposite each other with a slight gap between them.

Further, 25 is a handle fixed to one side of the guide pipe 16.

When the above-mentioned thermometer 1 is slidably inserted into the coil rail 8 of the rotary shaft 3 through the shaft hole 26 bored approximately at its axial center, the guide groove 27 formed in the co-pressure-side axial direction is inserted into the guide pipe. 16 to prevent rotation following the rotation of the rotary shaft.

The automatic lifting mechanism 2 has a steel ball loose fitting hole 2B& opened at the surface of the shaft hole 26 at the inner end of the bottle sliding hole 28 bored on one side of the nozzle 1, and the steel ball loosely fitted therein. A steel ball 29 that protrudes and retracts from the surface of the shaft hole 26 is inserted into the hole 28a, 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. to prevent the steel ball 29 from falling out, and 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 therein, and the pin sliding hole is inserted into the pin sliding hole. A stop bolt 62 screwed onto the 28 end prevents removal.

The rear end of the push pin 31 is a lever arm 35 which is pivotably pivoted via a pin shaft 34 to the lower end of a stepped groove 6 provided on one side of the rod/mer 1. The cam plate 38 is connected to the upper end of the filter 5 via a pin shaft '56, and a cam plate 38 is pivotally mounted between the lower ends of the lever arms 35 and 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 elastic so that it can be carried on a slope.

41 is a lock pin slidably inserted into a cylinder hole 42 bored from the upper surface of the cylinder 1 of the stepped portion 33;
A piston 45 formed at the center of the lock pin 41 is airtightly inserted into the cylinder hole 42 via an O-ring 44, forming an oil chamber 45 at the bottom, and a bearing port 49 screwed onto the end of the hole. The pressed coil anti-ring 46 is always elastically biased downward, and the engagement end 47, which is shaft-sealed via the O-ring 50, is engaged with the rear stepped portion 48 of the push pin 31, and the steel ball 29 is Either maintain the protruding position or release the engagement to allow the steel ball 29 to retreat from the surface of the shaft hole 26.

Reference numeral 51 denotes a hydraulic operation hole which is 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. Piston formed at the end, 54 with O ring 55
An oil chamber 56 is inserted airtightly and slidably through the lower part.
and the cylinder hole 4 through the communication hole 57.
It communicates with the oil chamber 45 of No. 2, and after being filled with hydraulic oil from an oil filler port 58, it is sealed with a plug 59.

, 60 is a bushing 1 integrated with the guide pipe 16.
This is a bottle pushing protrusion protruding from the B end, and when the hammer 1 reaches the upper limit of its upward movement, it comes into contact with the upper end of the lock release pin 53 and pushes it down.

61 is an auger shaft receiver 2 having a square shaft hole connected to the lower end of an auger shaft C connected to a rotating shaft of a hydraulic motor B etc. installed at the end of the working arm A of the auger crane.
is a square pipe shaft fixed to the upper end, and the square pipe shaft 61
A rectangular shaft-shaped conduction pipe 66 is slidably inserted from the lower end thereof, and the pipe is connected to the small diameter portion formed at the upper end of the rotating shaft 6 at the lower end of the conduction vibro 3. A shaped money feeding section 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 carrying out the present invention, it can be rotated in one direction as shown in FIG. 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. Lower the arm A end and hold the top of the pile E in the driving position.

At this time, the height of the end of the working arm A is adjusted so that the conduction pipe 66 is fully inserted into the square pipe shaft 611C.

In the pile driving operation, the hammer 1 is automatically raised in the above state by the worker gripping the handle 25 or driving the hydraulic motor B in a state where the core part does not rotate due to engagement with any fixed part. Then, it falls free again and repeats this process to drive the pile E.

That is, the square pipe shaft 61. The rotating shaft 6 is driven to rotate via the conductive vibro 3, and the coil rail 8 also rotates.

However, since the hammer 1 is prevented from rotating by engaging the guide groove 27 with the guide pipe 1B, 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 engages with the coil rail 8 by the push pin 61, and is pushed up by the screwing action, thereby raising the entire hammer 1.

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. into the coil spring 46
The piston 43 is pushed up against the elasticity of the piston 43.

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, the flange 4. An impact load is applied to the impact transmission protrusion 6 via the boss 7.

The cushioning rubber 22 is crushed by this load, the gap is closed, and the end of the impact transmission protrusion 6 hits the impact receiver 24, driving the pile E through the pile attachment 65.

Since the rotary shaft 6 continues to rotate while the hammer 1 is falling due to its own weight, when the hammer 1 reaches the lower limit of its stroke, the cam plate 68 of the automatic lifting mechanism 2
The cam actuating pin 11 of the flange 4 comes into engagement.

When the cam operating pin 11 slides into contact with the cam surface '59, the lever arms 5 and 35 swing around the central pin shaft 34, pushing the push pin 31 inward against the elasticity of the coil spring roller O. The steel ball 29 is pushed in by the push pin 31.
protrudes from the surface of the shaft hole 26 again.

At this time, the lock pin 41 is pushed back and engaged with the rear step portion 4B of the push pin roller 1 by the elasticity of the coil spring 46, so that the push pin 51 is locked at the position in which it is 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 by 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 pivoted to the shaft '57 and elastically supported by the tension spring 40, the cam surface 9 side is tilted upward, and at the same time, the cam operating pin 11 is also moved by the coil spring 14. The cam plate 380 is elastically biased upward.
The abutment causes the shaft hole 12 to retreat inward, and after the abutment between the two is buffered and the flange 4 rotates approximately -, the cam actuating pin 11 comes to press the cam surface 39 of the cam plate 38, and the hammer 1 is rotated. be forced to rise.

As described above, the head of the pile E becomes lower as the driving progresses, but since the conductive vibro 3 is slidably inserted into the square pipe shaft 61, it follows this and descends. The pile attachment 65 and the head of the pile E are never separated.

In addition, there is a buffer rubber 22 in the bearing recess 21 of the bearing support 20.
Because of this arrangement, the impact transmission protrusion 6 and the impact receiver 24 are separated by a gap except when the hammer 1 descends and collides, and the rotating shaft filter rotates smoothly.

As explained above, the pile driving device according to the present invention automatically raises and lowers the hammer using the rotational driving force of the earth auger, and does not require a separate dedicated drive source. Since it can be manufactured and utilizes a powerful hydraulic motor equipped on an auger crane, its application range is that of conventional portable pile driving equipment, and its advantages include that it does not have a momme ratio. be.

[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 both a and b are used, and Fig. 6 shows the hammer 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, Fig. 5 is an exploded perspective view of the cam plate installation part, Fig. 6 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 6~Rotation-shaft 5~Hammer receiver 16~Guide pipe
18 ~ Bush 20 ~ Bearing receiver 22 ~ Buffer rubber 23 ~ Bearing 24 ~ Shock receiver 25 ~ Handle
27 ~ Guide groove 29 ~ Steel ball 31 ~
Push pin 65 - Leverage arm 38 - Cam plate 41 - Lock bin 45.56 - Oil chamber 53 - Lock release pin 57 - Communication hole 60 - Pin extrusion projection 61 - Square pipe shaft 63 - Conduction pipe A - Auger crane working arm B ~Hydraulic motor C~Auger shaft D~Gap
E~Pile Diagram 2

Claims (2)

[Claims] (1) A pile attachment is formed in which the pile head is loosely fitted to the lower end of the hammer receiver configured at the lower end of the rotary shaft that is rotatably connected to the lower end of the auger shaft of the earth auger, and a coil rail that prevents sliding rotation is attached to the rotary shaft. At the same time, the hammers, which are slidably inserted outside the coil rail, are engaged and slid into guide vibes installed on the upper and lower ends of the rotary shaft, and the engagement members protrude and retract from the shaft hole surface of the hammer. An automatic elevating mechanism is provided for engaging or disengaging the mating end with the coil rail, the engaging end of the automatic elevating mechanism is protruded at the lower stroke limit of the hammer, and the engaging end is retracted at the upper stroke limit to raise the hammer. A pile driving device that uses an earth auger that continuously moves up and down along a rotating shaft and drives piles using the impact load caused by the fall of the hammer's own weight. (2) The automatic elevating mechanism is characterized by comprising a push pin that is moved in and out by a cam mechanism and a hydraulic mechanism, 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. Claim 1
A pile driving device that uses the earth auger described in Section 1.