JPH0220263Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vibrating pile driving/pulling machine that drives or pulls out sheet piles or piles by the vertical vibration of an exciter. This invention relates to a variable vibration type pile driving/pulling machine that can change the magnitude of vertical vibration energy.

In this type of vibrating pile driving and pile pulling machine, the greater the vibration energy generated by the vibrator, the faster the pile driving or pulling speed is, and the higher the work efficiency is.
The use of devices with large vibration energy in urban areas poses problems in terms of vibration and noise pollution. Furthermore, it is known that the amplitude of the ground (called surface waves or Rayleigh waves) is greatest when the tip of the pile is driven to a depth of 6 to 7 meters from the ground surface. There is a need for the development of a vibrating pile driving/pulling machine that can switch the vibration energy.

A variable vibration type pile driving and pile extraction machine that can increase and decrease the vertical vibration energy of the vibrator has been known for a long time, but this pile driving and pile extraction machine has a fixed eccentric weight and a A pair of rotor units formed by coaxially mounting a movable eccentric weight that can change the degree of polymerization against the The machine is configured to vibrate in the vertical direction, and the vibration drives (or pulls out) the pile into the ground.

In this pile driving/pulling machine, if the degree of polymerization between the fixed eccentric weight and the movable eccentric weight in the exciter is increased, the combined eccentric mass increases and the vibration energy of the exciter increases. If the degree of polymerization is reduced, the vibration energy will be reduced. However, among the known variable vibration type pile driving and pile pulling machines, for example,
As shown in Publication No. 113751, a movable eccentric weight is attached to the rotor shaft and a fixed eccentric weight so as to be freely displaceable within a predetermined angular range, and a motor for rotating the pair of rotor units is installed in two directions: forward and reverse. There is a motor that can be switched to the motor, and by changing the rotation direction of the motor, the degree of polymerization between the movable eccentric weight and the fixed eccentric weight can be automatically changed.

However, in the variable vibration type pile driving and pile pulling machine disclosed in Japanese Utility Model Application Publication No. 55-113751, the movable eccentric weight is not fixed to the rotor shaft or the fixed eccentric weight during operation, but simply follows the rotation. Because of this, the movable eccentric weight may shake against the rotor shaft or the fixed eccentric weight due to vibration during operation, which may cause the entire pile driving and extracting machine to oscillate laterally. There was a problem that vibrations in the vertical direction were weakened.

In view of the problems of the conventional variable vibration type pile driving and pile extracting machine as described above, this invention automatically moves a movable eccentric weight to the rotor body, which is composed of a shaft in the rotor unit and a fixed eccentric weight, during operation. The object of the present invention is to provide a variable vibration type pile driving/pulling machine capable of locking the pile, the rotor body having a fixed eccentric weight attached to the shaft in a non-rotatable manner. A vibrator in which a pair of rotor units with a variable synthetic eccentric mass, each equipped with a movable eccentric weight that can be rotated within a predetermined angular range, is installed in an exciter casing so as to rotate synchronously in opposite directions. furthermore, a motor for driving each of the rotor units is freely rotatable in two directions, and the combined eccentric mass of each of the rotor units is changed by switching the rotational direction of the motor between the two directions. In the variable vibration type pile driving and pile extracting machine that can change the magnitude of vertical vibration energy generated by the vibrator, each of the rotor units has one of the rotor body and the movable eccentric weight. a lock on one side, which remains stationary in a non-operating position until the rotor unit reaches a predetermined rotational speed, and is actuated in the locking direction by the centrifugal force when the rotor unit reaches the predetermined rotational speed; A locking device is provided for automatically locking a movable eccentric weight to the rotor body, which is made up of a member and a lock receiving portion on the other side that acts to releasably engage the locking member, and is movable during operation. This is characterized by the fact that by locking the eccentric weight to the rotor body, it is possible to prevent the entire pile driving/pulling machine from swinging laterally or from weakening the vibration energy in the vertical direction. .

Hereinafter, the variable vibration type pile driving and pile extracting machine of the present invention will be explained based on the illustrated embodiments.
In the figure, reference numeral A denotes a pile driving and pile extracting machine called a driver, and B denotes a vibrator that generates vibrations in the vertical direction, and the vibrator B is freely suspended from a hanger 6. Reference numeral C designates a chuck fixed to the lower part of the exciter B for gripping the sheet pile or pile D. Further, reference numeral 1 indicates an electric or hydraulic motor attached to the upper part of the exciter B, and numeral 9 indicates a casing of the exciter B.

Inside the exciter casing 9, a driving rotor unit 10 rotated by the motor 1 and a driven rotor unit 20 rotating in the opposite direction to the driving rotor unit 10 are arranged in parallel in the horizontal direction. It is attached to the shaft.

As shown in FIGS. 2 and 3, the driving rotor unit 10 and the driven rotor unit 20 are mounted at intermediate portions of the shafts 11 and 21, respectively.
Fixed eccentric weight 1 mounted non-rotatably relative to
2, 22, and movable eccentric weights 13, 23 which are rotatably attached to the shafts 11, 21 by a predetermined angular range θ (FIG. 4). Also, gears 19 and 29 of the same shape that mesh with each other are attached to one end side of each shaft 11 and 21, respectively, so that when the drive side rotor unit 10 is rotated, the driven side rotor unit 20 is rotated in the opposite direction. It is designed so that it can be rotated synchronously in both directions. A pulley 5 is attached to the end of the shaft 11 of the drive side rotor unit 10 on the side opposite to the gear.
A belt 4 is placed between the pulley 3 on the motor 1 side and the pulley 3 on the motor 1 side.

The motor 1 is rotatable in two directions, forward and reverse, and by switching the direction of rotation of the motor 1, the direction of rotation of both rotor units 10 and 20 can be switched between the two directions. .

The fixed eccentric masses 12, 22 and the movable eccentric masses 13, 23 on each side of each rotor unit 10, 20 have the same configuration, and the configurations of the fixed eccentric masses and the movable eccentric masses will be described below. The drive side rotor unit 10 side will be explained.

Fixed eccentric weight 12 of drive side rotor unit 10
has two semicircular eccentric bodies 31, 31 of the same shape and a wedge-shaped block body 32 having an appropriate thickness,
The eccentric bodies 31, 31 and the block body 32 are integrally fixed with bolts 33, with a block body 32 interposed between the eccentric bodies 31, 31. This fixed eccentric weight 12 is inserted into the shaft 11 through the shaft hole 34 formed in each eccentric body 31, 31, and then the keys 35, 35 are fitted between the two (the eccentric body 31 and the shaft 11). It is fixed by this. A wedge-shaped block body 32 is attached to one end side of the semicircular eccentric bodies 31, 31. This block body 32 serves as a stopper for regulating the range of rotation of the movable eccentric weight 13. Further, rubber cushioning materials 36, 36 are baked and fixed to the upper and lower slopes 32a, 32a of the block body 32, respectively, to reduce the impact force when the movable eccentric weight 13 collides with them. In this embodiment, the angle formed by the upper and lower slopes 32a, 32a (the upper surface of the upper buffer material 36 and the lower surface of the lower buffer material 36) of the block body 32 is approximately 40 degrees.

The shaft 11 and the fixed eccentric weight 12 constitute a rotor body 10X of the rotor unit 10.

The movable eccentric weight 13 is formed in a fan shape having the same outer circumference as each eccentric body 31, 31 of the fixed eccentric weight 12. This movable eccentric weight 13 is formed to be slightly thinner than the thickness of the wedge-shaped block body 32, and the movable eccentric weight 13 has its shaft hole 24 fitted loosely into the shaft 11 between the two eccentric bodies 31, 31. ing. The movable eccentric weight 13 moves around the shaft 11 at one end surface 1 in the arc direction of the movable eccentric weight 13.
3a is one cushioning material 3 of the wedge-shaped block body 32
The other end surface 13b of the movable eccentric weight 13 in the circular arc direction from the position where it abuts the outer surface 36a of the movable eccentric weight 13 (the position indicated by the solid line 13 in FIG. 5) is connected to the wedge-shaped block body 3.
It is possible to rotate within a range of angle θ up to a position where it abuts the outer surface 36a of the other cushioning material 36 (position 13' shown by a chain line). In addition, the movable eccentric weight 13
In this embodiment, the movable eccentric weight 13 is designed to be rotatable within an angle of approximately 180°.

The drive-side rotor unit 10 and the driven-side rotor unit 20 are mounted on the exciter casing 9 such that the eccentric weights 12, 13 and 22, 23 on each side are horizontally symmetrical to each other. . By doing this, each rotor unit 1
When 0 and 20 are rotated in opposite directions, the lateral vibration effects of the eccentric weights 12, 13 and 22, 23 on each side are canceled out so that the exciter B can be vibrated only in the vertical direction. I have to.

This exciter B rotates the motor 1 in the forward rotation direction (first
When the rotor unit 10 is rotated in the direction of arrow R in the figure, the driving side rotor unit 10 is rotated in the right direction (in the direction of arrow R in FIG. 4), and the driven rotor unit 20 is rotated in the left direction (in the direction of arrow L).
At this time, the movable eccentric weights 13, 23 on each side are in a state where the degree of polymerization with each fixed eccentric weight 12, 22 is increased (fully polymerized state), as shown by the dotted lines in FIG. When the motor 1 rotates with the shafts 11 and 12, large vertical vibrations can be obtained, and conversely, when the motor 1 is rotated in the opposite rotation direction (in the direction of arrow L in FIG. 1), the rotor units 10 and 20 are rotated in the opposite direction to the above, and at this time, the movable eccentric weights 13, 23 on each side
As shown by chain lines 13' and 23', in a state where the degree of polymerization with each fixed eccentric weight 12, 22 has become small (non-polymerized state), it rotates with each shaft 11, 21 and generates a small vertical vibration. It is now possible to obtain

A movable eccentric weight 13, 23 is attached to each rotor unit 10, 20 during operation.
A locking device Z, Z for locking to X is provided. These locking devices Z, Z are for automatically locking the movable eccentric masses 13, 23 by utilizing the centrifugal force generated in each rotor unit 10, 20 during operation.
Lock members 15, 15 provided on the 3, 23 sides
A, 25, 25A and each rotor body 10X, 20X
Lock receiving portions 16, 16A, 26, provided on the side
26A. Since the locking devices Z and Z provided in each of the rotor units 10 and 20 have the same configuration, only the locking device Z on the drive side rotor unit 10 side will be described.

The locking members 15 and 15A of the locking device Z are respectively provided near both ends of the movable eccentric weight 13 in the arc direction. Note that notches 17, 17 are formed at the corners of both ends of the movable eccentric weight 13 in the arc direction, into which protruding pieces 37 of a block body 32, which will be described later, are fitted. The distal ends of the respective notches 17 and 17 are adapted to be able to protrude and retract toward the respective notches 17, 17, respectively. Lock members 15, 15
A is a head 40 with a head 40a formed at the inner end.
A pin 40 with a is adopted, and the pin 40
A cylindrical boss 4 is fitted and fixed into holes 41, 41 formed from the notches 17, 17 toward the axis 11.
2, 42 so as to be movable inward and outward directions. Inside the boss 42, there are two steps 42a, inside and outside.
42b is formed, and a spring 43 is interposed between the outer step portion 42b and the head 40a of the pin 40 to bias the pin 40 in the direction of the axis 11. Further, this pin 40 is configured such that its head 40a can move within a range where it abuts against the inner step 42a of the boss 42 from the bottom of the hole 41, and the pin 40 is recessed inward. In the state (the state shown in FIG. 5), the pin tip 40b is not exposed to the notch 17 side,
On the other hand, when the pin 40 projects outward (the state shown in FIG. 6), the pin tip 40b projects toward the notch 17 side. This pin 40 is connected to the rotor unit 10 at a predetermined rotation speed (for example, 500 rpm).
When the spring 4 is reached, the centrifugal force causes the spring 4 to
The rotor unit 10 is configured to automatically move outward against the biasing force of the rotor unit 3, and is biased by a spring 43 to move inward when the rotor unit 10 stops.

The locking members 15, 15A (pins 40, 40)
Lock receiving portions 25, 25A for receiving the locks are formed on the wedge-shaped block body 32 side. That is, the block body 32 has 32 holes on each of its upper and lower slopes.
protruding pieces 3 that can fit into the notches 17, 17 of the movable eccentric weight 13, respectively, near the outer ends of the movable eccentric weights 13;
7 and 37 are welded. This protruding piece 37,3
7, each end face 13a, 13b of the movable eccentric weight 13
are the respective cushioning materials 36 and 3 on the block body 32 side.
When the pins 40, 40 are in contact with the outer surfaces 36a, 36a of the pins 4,
Holes 16 and 16A are formed to serve as lock receiving portions into which the tips 40b of the screws are inserted. It should be noted that even if the motor 1 is operated in either the forward or reverse direction of rotation, one of the two pins 40, 40 (lock member) will be connected to both the lock receiving portions (holes) 1.
6 or 16A, and furthermore, when each rotor unit 10 or 20 reaches a predetermined rotation speed, the tip 40b of the corresponding pin 40 opens into a hole (16 or 16A). It is designed to fit inside.

In addition, the reference numeral 44 in FIG. 3 indicates a retaining pin for the boss 42, and the reference numeral 45 in FIGS. 5 and 6 indicates an air vent formed to pass through the center of the pin 40 in the length direction. There is.

Next, the operation of the pile driving/pulling machine A having the above structure will be explained. First, when the vibrator B is to be vibrated with high energy, the motor 1 is rotated forward (in the direction of arrow R in FIG. 1). Then, the driving side rotor unit 10 and the driven side rotor unit 20 are moved by the movable eccentric weight 1 on each side.
3 and 23 are rotated in opposite directions relative to the fixed eccentric weights 12 and 22 on each side in a state of large overlap (complete overlap), as shown by dotted lines in FIG. It is now possible to vibrate with high energy. Also, conversely, exciter B
When vibrating with low energy, motor 1
When the rotor units 10 and 20 are rotated in the opposite direction (in the direction of arrow L in FIG.
3 and 23 are rotated in a slightly polymerized (non-polymerized) state relative to the fixed eccentric weights 12 and 22 on each side, as shown by chain lines 13' and 23' in FIG. It can be made to vibrate with energy. Then, the driving site of the sheet pile or pile D or the pile D
The driving or pulling operation of the pile D can be performed while adjusting the strength of the vertical vibration of the exciter B in accordance with the progress of the driving.

Furthermore, even if the motor 1 is driven in either the forward or reverse direction of rotation, the movable eccentric weights 13 and 23 of each rotor unit 10 and 20 cause the rotor unit 10 and 20 to rotate (usually at 1500 rpm or more). The resulting centrifugal force causes the locking members (15 or 15A, 25 or 25A) on either side to fit into the corresponding lock receivers (16 or 16A, 26 or 26A) and automatically lock the rotor. The movable eccentric weights 13, 23 are now locked to the rotor bodies 10X, 20X, and do not wobble with respect to the rotor bodies 10X, 20X during operation. That is, when the motor 1 rotates in the forward direction, for example, on the drive side rotor unit 10 side, the movable eccentric weight 13 is rotated in the right rotation direction (arrow R direction) as shown in FIG. The tip of the locking member 15 on the end face 13a side of the movable eccentric weight 13 that abuts against the block body 32 is positioned as shown by the solid line, and the tip of the locking member 15 is fitted into the corresponding lock receiving portion 16, and vice versa. When motor 1 rotates in reverse,
The drive side rotor unit 10 is rotated in the counterclockwise direction (in the direction of arrow L in FIG. 6), so that the movable eccentric weight 13 is positioned as shown by the chain line, and the movable eccentric weight 13 collides with the block body 32. The tip of the locking member 15A on the side of the end face 13b that is open is fitted into the corresponding lock receiving portion 16A to lock the movable eccentric weight 13, respectively. Note that when the motor 1 is stopped, the centrifugal force generated in each rotor unit 10, 20 disappears, and the lock members 15, 15A, 25, 25
A is automatically unlocked.

In the illustrated embodiment, the movable eccentric weights 13, 2
A locking device Z for locking the movable eccentric weight 1 locks the locking members 15, 15A, 25, 25A.
3, 23 side, lock receiving parts 16, 16A, 2
6, 26A are provided on the block body 32 side,
In other embodiments, the lock member may be provided on the shafts 11, 12 or the eccentric body 31 side of the fixed eccentric weight, and the lock receiver may be provided on the movable eccentric weight 13, 23 side, and the lock member and the lock member may be provided on the side of the movable eccentric weight 13, 23. The structure of the receiving part is not limited to the above embodiment, and the design can be changed as appropriate as long as it is of a type that is automatically locked or unlocked by the action of centrifugal force.

Next, to explain the effects of the present invention, the present invention has the following:
By switching between forward and reverse rotation of the motor 1, the degree of superposition of the fixed eccentric weights 12, 22 and the movable eccentric weights 13, 23 of each rotor unit 10, 20 is changed, and the vertical vibration generated in the exciter B is In a variable vibration type pile driving/pulling machine capable of changing the amount of energy, each rotor unit 10, 2
0, a locking device that is activated to lock the movable eccentric weights 13, 23 onto the rotor bodies 10X, 20X by the centrifugal force when the respective rotor units 10, 20 reach a predetermined rotation speed. Z, Z are provided, so in this type of variable vibration type pile driving and pile pulling machine, the movable eccentric weight 13,
23 does not wobble with respect to the rotor bodies 10X, 20X, which has the effect of preventing the vibration exciter B from horizontally shaking or weakening the vibration in the vertical direction.

[Brief explanation of the drawing]

Figure 1 is a front view of a variable vibration type pile driving and pile extraction machine according to an embodiment of the present invention, Figure 2 is a perspective view showing the internal structure of the exciter in the pile driving and pile extraction machine of Figure 1, and Figure 3 is a Fig. 2 is an exploded perspective view showing the structure of each rotor unit housed in the exciter, Fig. 4 is an explanatory diagram of the operation of each rotor unit in Fig. 3, and Figs. 5 and 6 are respectively Fig. 3. FIG. 6 is an explanatory diagram of the operation of the locking device in each rotor unit shown in FIG. A...Pile driving/pulling machine, B...Exciter, Z...Lock device, 1...Motor, 9...Exciter casing, 10, 20...Rotor unit, 10X, 2
0X...Rotor body, 11, 21...Shaft, 12,
22... Fixed eccentric weight, 13, 23... Movable eccentric weight, 15, 15A, 25, 25A... Lock member, 16, 16A, 26, 26A... Lock receiver.

Claims (1)

[Scope of utility model registration request] Eccentric weights 12, 22 fixed to the shafts 11, 21
The rotor body 10X, 20 is formed by non-rotatingly mounted
A pair of rotor units 1 with a variable synthetic eccentric mass, each equipped with movable eccentric weights 13 and 23 that can rotate within a predetermined angle range θ around the shafts 11 and 21.
0 and 20 are mounted in an exciter casing 9 so as to rotate in synchronized directions in mutually opposite directions, and furthermore, the motor 1 for driving each of the rotor units 10 and 20 is rotated in forward and reverse directions. Each rotor unit 10, 20 is rotatable in two directions and the rotation direction of the motor 1 is switched between forward and reverse directions.
The variable vibration pile driving and pile extracting machine is capable of changing the magnitude of vertical vibration energy generated by the vibrating machine B by changing the composite eccentric mass of each of the rotor units 10, 20.
, one of the rotor bodies 10X, 20X and the movable eccentric weights 13, 23, 10X, 20
X or 13, 23 side, and remains stationary in the non-operating position until the rotor units 10, 20 reach a predetermined rotational speed, and the rotor units 10, 20
locking members 15, 15A, 25, 25A that are actuated in the locking direction by the centrifugal force when the rotation speed of the locking member 20 reaches the predetermined rotational speed, and the other locking members 13, 2
3 or 10X, 20X side, and has the function of releasably engaging the lock members 15, 15A, 25, 25A.
Movable eccentric weight 13 consisting of A, 26, 26A,
A variable vibration type pile driving/pulling machine characterized by being provided with a locking device Z for automatically locking the piles 23 to the rotor bodies 10X, 20X.