JPH10298990A - Vibratory pile driving and drawing device and control method for vibratory pile driving and drawing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the increase and decrease of vibratory force so as to prevent a trouble caused by resonance of the ground and a cane boom by enabling the control for a rotational phase difference between the fixed eccentric weight and the movable eccentric weight of a rotary exciter during operation in the case of installing plural rotary exciters on one pile to perform vibratory pile driving and vibratory pile drawing works. SOLUTION: Concerning plural rotary exciters 60A, 60B, fixed eccentric weight axes are connected to each other by a universal coupling 65a, and driven in rotation by a driving motor Ma, and movable eccentric weight axes are connected to each other by a universal coupling 65b and driven in rotation by a driving motor Mb. These two motors Ma, Mb are electrically controlled to control the rotational phase difference between them while rotating the fixed eccentric weights and movable eccentric weights.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a single large pile,
Alternatively, the present invention relates to a novel technique of driving and / or pulling out a plurality of piles integrally connected by a plurality of rotary exciters.

[0002]

2. Description of the Related Art A vibratory pile driving machine is known as a technique for driving a ready-made pile into the ground without generating a loud impact sound or a loud impulsive vibration. Is also used effectively. Vibration pile punching machines include a rotary shaker that rotates an eccentric weight and a piston shaker that violently reciprocates a piston with fluid pressure, and both are widely used. If they must be generated, rotary exciters are more advantageous. Further, when driving a large pile requiring a large exciter, or when a large number of piles are integrally driven, a plurality of rotary exciters are attached to the pile, There is also known a technique in which a basic rotary exciter is mechanically synchronized and driven in synchronization.

[0003] Fig. 9 shows two examples in which a pile driving operation is performed using a plurality of rotary exciters, and (A) shows two rotary exciters attached to one large steel pipe pile. (B) is a perspective view of a state in which a number of rotary exciters are attached to a steel sheet pile cell in which a number of steel sheet piles are assembled in a tubular shape. In the example shown in FIG. 9A, the steel pipe pile 63 is gripped by the pile chucks 62A and 62B provided below the base member 72. Two exciters 60A and 60B are installed on the base member 72, and are suspended by a crane via a spring 64. That is, although not shown in the drawing, the above-described exciters 60A and 60B are suspended by a crane boom via a crane hook. As described above, the fact that the exciters 60A and 60B operate and generate vibrations while being suspended by the crane boom (not shown) is an important cause of causing a problem of resonance of the crane boom described in detail later. become. When a pile that is much larger than the steel pipe pile 63 has to be formed, a technique of connecting a number of sheet piles to form a sheet pile assembly pile 71 as shown in FIG. 9B is also known. Widely used. In this example, each of the large number of exciters 60 is driven by
The exciters 60 are attached to the upper end of the vehicle 1 and are suspended by a crane boom (not shown) via an annular frame 73.

[0004]

Vibration pile driving and vibration pile punching (hereinafter referred to as vibration pile punching) are more shocking sound and shocking than conventional steam hammers, drop hammers, diesel hammers and the like. Although the vibrations are significantly reduced, there are technical difficulties with vibrational resonance. FIG. 5 is a view for explaining the problem of resonance in the vibration pile punching operation. FIG. 5 (A) shows that a rotary type vibration exciter is suspended by a crane boom to perform vibration punching of a pile. FIG. 4B is a cross-sectional view schematically illustrating a state in which the vibrations are present. FIG. As shown in FIG. 5A, the top of the pile 7 is
a, and the exciter 6 is crane boom 5
When the pile 7 is suspended while the vibrator 6 is operated to apply vibration to the pile 7, the pile 7 sinks into the ground. At this time, the surface wave a and the underground wave b propagate as shown in the figure,
There is a possibility that the vehicle may reach the private house 8 and cause vibration pollution. In this case, when the resonance frequency (natural frequency) n _{1 of} the ground and the generated frequency of the exciter 6 match, a resonance (resonance) phenomenon occurs, and the risk of occurrence of vibration pollution increases significantly. Further, when the occurrence frequency of the resonance frequency n ₂ and exciter 6 of the crane boom 5 are matched, the greater the risk that the crane boom 5 is broken occurs a resonance phenomena.

When the operation of the vibration exciter is started at a time t ₀ shown on the time axis (horizontal axis t) of FIG. 5B, the frequency increases as the rotational speed of the rotary vibration exciter increases. It rises as shown by c, and reaches the rated rotation at time t ₁ when the acceleration period T ₁ has elapsed. During this rotation speed increasing frequency increases due to the (arrow c), so passing through the resonance frequency n ₁ of the ground, possibility is there to produce significant vibration pollution at this time.

[0006] In order to solve the above-mentioned problems related to resonance, there is known a technique of adjusting the vibrating force by changing the eccentric moment of an eccentric weight without changing the rotation speed of a rotary exciter. In FIG. 5B, the eccentric moment is reduced to zero at time t ₀ , and no oscillating force is generated even when the rotor is rotated, and the speed is increased as indicated by an arrow c (in this case, the rotation speed is increased). This is almost the same as increasing the frequency.) When the eccentric moment is increased to generate the vibrating force when the rated rotation is reached, the ground resonance frequency n ₁ and the crane boom resonance frequency n
₂ is passed in a state where the vibrating force is zero, so that occurrence of troubles related to resonance can be prevented. Also, when decelerating as indicated by the arrow d finishing punching pile at time t _2, the resonance frequency n _2, n ₁ of the until stopped at the time t ₃ has elapsed the deceleration period T ₂ However, in this case, there is no possibility that a resonance-related trouble will occur if the excitation force is set to zero at the start of deceleration (time t ₂ ). As is clear from the above description, the change of the eccentric moment (that is, the adjustment of the vibrating force) for preventing the trouble related to the resonance can be performed without stopping the rotation of the rotary type vibrator. It is necessary to be able to do it on an ongoing basis.

Next, a method for adjusting the vibrating force by changing the eccentric moment of the eccentric weight in the rotary vibrator will be described. FIG. 6 is a schematic diagram for explaining adjustment of the vibrating force in a rotary vibration exciter including a fixed eccentric weight and a movable eccentric weight,
(A) shows the state of the maximum excitation force, (B) shows the state of the moderate excitation force, (C) shows the state of the small excitation force, (D) shows the state of the zero excitation force, Each is represented. (This figure 6 (B)
The rotary shaft 2 to which the fixed eccentric weight 9 is attached is rotated by the drive motor M. The rotation of the fixed eccentric weight 9 and the rotating shaft 2 is transmitted to the rotating shaft 2 'on which the movable eccentric weight 10 is mounted via synchronous transmission gears 4 and 4'. As a result, the fixed eccentric weight 9 and the movable eccentric weight 10 rotate in the opposite direction at the same speed, but when viewed in the direction of arrow E, that is, when projected on the projection surface S and considered, the fixed eccentric weight 9 The weight 9 and the movable eccentric weight 10 always move up and down in the same direction at the same speed. Thereby, the rotating shaft 2
2 'receives a vertical reaction force to generate a vibrating force. As described above, there is no particular difference in the mechanism for generating the vibrating force because the fixed eccentric weight and the movable eccentric weight are equally involved. In the present invention, an eccentric weight directly rotated and driven by a drive motor is referred to as a fixed eccentric weight for convenience of explanation. This is a name in the sense of an eccentric weight fixed to the drive shaft. An eccentric weight that can adjust the rotation phase with respect to the fixed eccentric weight is called a movable eccentric weight. As is apparent from such circumstances, the fixed eccentric weight and the movable eccentric weight are relative names that can be replaced depending on how to take a reference. Therefore, for example, the fixed eccentric weight and the movable eccentric weight can be interchanged with each other in the description of the claims, and the interchanged configuration also belongs to the technical scope of the present invention.

FIG. 6D shows a state in which the movable eccentric weight 10 is given a phase difference of 180 degrees with respect to the fixed eccentric weight 9. In this state, when both eccentric weights rotate in the opposite direction at the same speed, the perpendicular bisector m− of the rotating shaft 2 and the same 2 ′ is obtained.
Both eccentric weights will always be located symmetrically with respect to m. That is, both eccentric weights always move at the same speed in opposite directions in the vertical direction. Therefore, the rotating shaft 2
And 2 'receive a reaction force in the opposite direction with respect to the vertical direction,
The reaction forces received by both rotating shafts cancel each other, and no vibrating force is generated. FIGS. 6B and 6C show an intermediate state between the state of the maximum excitation force of (A) and the state of zero excitation force of (D). Comparing (B) and (C), (B) is closer to (A) and (C) is closer to (D). Therefore, (A), (B), (C), and (D) are arranged in descending order of the vibrating force. In FIG. 6, the fixed eccentric weight axis and the movable eccentric weight axis are drawn in parallel. However, the fixed eccentric weight and the movable eccentric weight may be arranged concentrically. As described above, there are various configurations for changing the phase difference between the fixed eccentric weight 9 and the movable eccentric weight 10 without stopping the rotation while rotating the eccentric weight 9 and the movable eccentric weight 10 in principle at the same rotation speed. the study,
A device has been devised.

FIG. 7 is a schematic cross-sectional view of a rotary exciter provided with a known phase control mechanism, which has been deformed and drawn for easy understanding of the structure and function.
It is not a projection drawing of the S standard. The overall configuration is divided into a system A and a system B, and as described later in detail, each system is rotationally driven. First, when looking at the transmission system that rotationally drives the rotating shafts of both the A and B systems, the rotating shaft 31 of the A system is
It is rotationally driven by an A-system electric motor Ma via an A-system driven pulley 45, a winding transmission means 47, and an A-system drive pulley. Similarly, the B-system rotating shaft 32 includes a B-system driven pulley 46, a winding transmission means 47, and a B-system drive pulley 49.
And is rotationally driven by a B-system electric motor Mb. A-system drive gear 33 with respect to A-system rotation shaft 31
Are fixed by a key 34. In FIG. 7, the keys other than the key 34 are omitted from the reference numerals, but the portions where the key shapes are drawn are fixed with respect to the axes, and the portions where the key shapes are not drawn. Are fitted so as to be relatively rotatable.

The A-system drive gear 33 fixed to the A-system rotation shaft 31 is meshed with and transmitted by an A-system driven gear 35 having the same number of teeth. The A-system driven gear 35 is supported by the B-system rotating shaft 32 so as to be relatively rotatable (keys are not drawn). Further, the A-system movable eccentric weight 39 which is rotatably supported by the B-system rotation shaft 32 is connected to the A-system driven gear 35 by a synchronous connecting rod 40. On the other hand, the A-system fixed eccentric weight 26 is fixed to the A-system rotating shaft 31 (the key is drawn). As described above, the A-system fixed eccentric weight 26 and the A-system movable eccentric weight 39 are connected to the A-system electric motor Ma.
Are rotated in opposite directions at equal speed. The centrifugal reaction force generated by the rotation of these eccentric weights is transmitted to the case 1 via the rotation shaft.

The B-system drive gear 44 fixed to the B-system rotary shaft 32 meshes with and transmits a B-system driven gear 41 having the same number of teeth. The B-system driven gear 41 is supported by the above-described A-system rotary shaft 31 so as to be relatively rotatable (keys are not drawn). Further, the B-system movable eccentric weight 37, which is rotatably supported by the A-system rotation shaft 31, is connected to the B-system driven gear 41 by a synchronous connection rod 43. On the other hand, the B-system fixed eccentric weight 38 is fixed to the B-system rotating shaft 32 (the key is drawn). As described above, the B-system fixed eccentric weight 38 and the B-system movable eccentric weight 37 are connected to the B-system electric motor Mb.
Are rotated in opposite directions at equal speed. The centrifugal reaction force generated by the rotation of these eccentric weights is transmitted to the case 1 via the rotation shaft.

The electric motor Ma driving the A system
And the electric motor Mb driving the B system are electrically controlled in cooperation with each other, and the fixed eccentric weight and the movable eccentric weight of each of the two systems are basically moved at a constant speed. While rotating, the phase difference between the two is changed as necessary.

Due to the change in the phase difference, the total eccentric moment of the fixed eccentric weight and the movable eccentric weight changes, and the vibrating force is increased or decreased.

FIG. 8 is a schematic sectional view of a rotary exciter provided with an unknown phase difference adjusting mechanism (Japanese Patent Application No. 8-345620). The eccentric weight shaft 44 is rotatably supported by the casing 43 and is driven to rotate by a drive motor 50. The drive motor 50 may be an electric motor, a hydraulic motor or any other motor. A drive-side fixed eccentric weight 46 is fixed to the eccentric weight shaft 44 and a drive-side movable eccentric weight 48
Are rotatably supported relative to each other. On the other hand, the outer tube 45
a and the inner shaft 45b are
, And a control-side fixed eccentric weight 47 is integrally connected to the outer tube 45a. The control-side movable eccentric weight 49 is fixed to the inner shaft 45b. Further, the drive-side fixed eccentric weight 46 and the control-side fixed eccentric weight 47 are mechanically constrained to rotate synchronously by gear transmission, and the drive-side movable eccentric weight 48 and the control-side movable eccentric weight 49 Are mechanically constrained to rotate synchronously by gear transmission.

The double shaft outer tube 45a and the inner shaft 45b are transmitted through a phase difference control mechanism (shown enclosed by an elliptical chain line) so that the phase difference can be adjusted. The inner shaft 45
b, a right-handed spiral groove 54 is formed on the outer tube 45a, and a left-handed spiral groove 55 on the outer tube 45a is formed on the outer tube 45a. It fits in the spiral groove. With such a structure, when the tubular member 56 is moved in the left-right direction in the drawing,
The inner shaft 45b and the outer tube 45a are relatively rotated by the screw action. This changes the phase difference between the two fixed eccentric weights (46, 47) and the two movable eccentric weights (48, 49). The change in the phase difference changes the total eccentric moment, and the vibrating force is increased or decreased. This adjustment can be made during operation of the exciter by the annular piston 52 of the hydraulic cylinder 51.

In the case of punching a relatively small pile, the excavator illustrated in FIG. 7 or FIG. 8 can be generally mounted on the pile to work while controlling the vibrating force. When punching a pile, or when the pile has a high resistance to punching due to the ground, a large number of exciters are installed to perform the work.

FIG. 9 shows two examples in which a plurality of exciters are mounted on one pile. FIG. 9A shows a state in which two exciters are mounted and suspended on one steel pipe pile. FIG. 2B is a perspective view of a state in which a number of exciters are mounted and suspended on the upper end of a set of pile piles in which a number of steel sheet piles are arranged in a cylindrical shape and connected.
In the example shown in this figure (A), the top of the steel pipe pile 63 is gripped by two sets of pile chucks 62A and 62B installed below the base member 72, and the base member 72
Two exciters 60A and 60B are mounted on the upper side of the vehicle, and each of these two exciters is suspended by a spring 64 by a crane (not shown). In the example shown in FIG.
A number of vibration exciters 60 are arranged in a row at the top of a tubular sheet pile assembly pile 71. In this example, a member corresponding to the base member 72 in the example of FIG. (A) described above is not shown, but the vicinity of the top of the sheet pile assembling pile 71, which is a rigid member integrally connected, functions as an annular base. I have. Each of the plurality of exciters 60 is suspended by a crane (not shown) via an annular frame 73.

As described above, when a plurality of exciters are mounted on a single pile and a pile is punched, the vertical vibration of each of the plurality of exciters is not random. They must be coordinated to perform the pile punching action in concert. If these exciters are `` simple rotary exciters with no distinction between fixed eccentric weight and movable eccentric weight '', simply connect them so that the rotation axes of the exciters are synchronized. good. As described above, the technique of connecting a plurality of rotary exciters (having a structure in which the eccentric moment cannot be adjusted) to form one pile or one assembled pile is a technique according to the invention of the present inventor. JP-A-57-116828 and JP-A-5-168828
It is known from JP 9-41523. However, it was not possible with the conventional technique to attach and mount a plurality of exciters to one pile or one assembled pile to increase or decrease the excitatory force while operating the plurality of exciters. . The present invention has been made in view of the above-described circumstances, and a plurality of rotary exciters having a fixed eccentric weight and a movable eccentric weight are cooperated to interrupt a pile punching operation. It is an object of the present invention to provide a technique for changing the total eccentric moment of the fixed eccentric weight and the movable eccentric weight while increasing the vibrating force without continuing.

[0019]

The basic principle of the present invention created to achieve the above object (excitation force control of a plurality of exciters) is shown in FIG.
Briefly referring to (B), two exciters 60A, 6
The fixed eccentric weight and the movable eccentric weight shaft provided in each of OBs are opposed to each other, and are connected by universal joints 65a and 65b so as to rotate synchronously with each other.

In the prior art, only the synchronous transmission of the drive shaft was considered to merely synchronize the vertical movements of a plurality of exciters, but in the present invention, the plurality of exciters are individually And the movable eccentric weight shafts are synchronized so that the phase difference of the movable eccentric weight with respect to the fixed eccentric weight shaft can be increased or decreased. The specific configuration will be described below for each claim.

According to the first aspect of the present invention, based on the basic principle described above, a pile chuck is installed below a beam-shaped base member, and a plurality of rotary starters are mounted on the beam-shaped base member. In a vibratory pile punching device provided with a vibration exciter, the plurality of rotary exciters each have a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight mounted with a movable eccentric weight. And the plurality of rotary exciters are arranged such that the fixed eccentric weight axis is positioned substantially linearly and the movable eccentric weight axis is positioned substantially linearly. The fixed eccentric weight shafts aligned in a straight line are connected so as to rotate synchronously with each other, and the movable eccentric weight shafts aligned in a straight line are connected so as to rotate synchronously with each other. Drive the fixed eccentric weight spindle And a mechanism for transmitting the rotation of the connected fixed eccentric weight shaft to the connected movable eccentric weight shaft and adjusting the phase difference between the two eccentric weight shafts. It is characterized by. According to the apparatus of the first aspect described above, since the fixed eccentric weight shafts of the plurality of rotary exciters are arranged substantially linearly, it is easy to connect them so as to rotate synchronously. Therefore, there is no fear that noise is generated from the joint portion, heat is generated in the joint portion, and the bearing portion is seized. Since these fixed eccentric weight shafts are connected to each other, a plurality of fixed eccentric weight shafts can be rotationally driven by one motor. Further, while the plurality of movable eccentric weights are connected so as to rotate synchronously with each other,
Since these connected movable eccentric weight shafts are transmitted and rotated from the fixed eccentric weight shafts, one driving motor is provided as a whole vibrating pile punching device including a plurality of rotary exciters. The structure is simple because it is sufficient. The small number of drive motors installed as described above simplifies the wiring or piping system for supplying energy to the drive motors, so that maintenance and maintenance are easy, the trouble occurrence rate is reduced, and the operation reliability is reduced. There are many places that contribute to the improvement of practical value, such as rising. Further, since the connected movable eccentric weight shafts are adjusted to increase or decrease the phase difference with respect to the fixed eccentric weight shafts while the movable eccentric weight shafts rotate synchronously, the fixed eccentric weights for each exciter are accordingly adjusted. The phase difference between the weight and the movable eccentric weight and the total eccentric moment increase or decrease, and the vibrating force changes. Since the change in the excitation force can be performed while the operation of the rotary exciter is continued, it is possible to prevent troubles related to resonance with the ground or the crane boom.

According to a second aspect of the present invention, there is provided a vibrating pile in which a pile chuck is installed below a beam-shaped base member, and a plurality of rotary exciters are installed on the beam-shaped base member. In the punching device, the plurality of rotary exciters each include a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, and The plurality of rotary exciters are arranged such that the fixed eccentric weight shafts are positioned substantially in a straight line, and the fixed eccentric weight shafts arranged in a straight line rotate one by one. A motor that is connected and that rotationally drives these connected fixed eccentric weight shafts is provided. For each of the plurality of rotary exciters, “the rotation of the fixed eccentric weight shaft is controlled by the movable eccentric weight shaft. And the phase difference between both eccentric weight shafts With the phase difference adjusting mechanism "is provided to adjust reduced, independently of each respective phase difference adjusting mechanism, or wherein the operating system to operate brought cooperation with each other are provided. According to the apparatus of the second aspect described above, since the fixed eccentric weight shafts of the plurality of rotary exciters are arranged substantially in a straight line, it is easy to connect them so as to rotate synchronously. Therefore, there is no fear that noise is generated from the joint portion, heat is generated in the joint portion, and the bearing portion is seized. Since these fixed eccentric weight shafts are connected to each other, a plurality of fixed eccentric weight shafts can be rotationally driven by one motor. In addition, each of the plurality of rotary exciters is provided with a “phase difference adjustment mechanism that transmits and rotates the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft and increases or decreases the phase difference between the two eccentric weight shafts”. In addition, since there is provided an operation system for operating these phase difference adjusting mechanisms, there is no need to provide a motor for phase difference control in each exciter, and a fixed eccentric weight and a movable eccentric weight are provided for each exciter. By changing the total eccentric moment with the weight, the vibrating force can be controlled to increase or decrease. Thereby, it is possible to prevent troubles relating to resonance with the ground and resonance with the crane boom.

According to a third aspect of the present invention, there is provided a vibrating pile in which a pile chuck is installed below a beam-shaped base member, and a plurality of rotary exciters are installed on the beam-shaped base member. In the punching device, the plurality of rotary exciters each include a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, and The plurality of rotary exciters are connected by positioning the fixed eccentric weight axis and the movable eccentric weight axis substantially in a straight line, and an electric motor for rotating and driving the fixed eccentric weight axis and a movable eccentric weight. And an electric motor for rotationally driving the motor, and the two electric motors are characterized in that their rotational phase difference is controlled. According to the apparatus of the third aspect described above, the fixed eccentric weight shafts and the movable eccentric weight shafts of the plurality of vibration exciters are connected in a straight line and connected to each other. The eccentric weight shaft is rotated synchronously. Since the plurality of movable eccentric weight shafts are arranged in a straight line and connected to each other, the plurality of movable eccentric weights are synchronously rotated. Further, since each of the series of fixed eccentric weight shafts and the series of movable eccentric weight shafts is rotationally driven by an electric motor capable of controlling a rotational phase difference, the fixed eccentric weights mounted on the fixed eccentric weight shafts The phase difference between the weight and the movable eccentric weight mounted on the movable eccentric weight shaft and the total eccentric moment can be increased or decreased. As a result, the exciter can be increased or decreased and adjusted while continuing to operate the exciter without stopping, so that the rotational speed range at which there is a risk of resonance with the ground, and / or the vibration with the crane boom can be adjusted. By causing the vibrating force to be zero (or less than the gravitational acceleration) in a rotational speed range in which there is a risk of occurrence of a problem, it is possible to prevent a trouble caused by a resonance phenomenon.

According to a fourth aspect of the present invention, an N-shaped rotary exciter is mounted on an annular or arcuate base (where N is 3 or an integer of 3 or more). Each of the vibrators has a fixed eccentric weight shaft mounted with a fixed eccentric weight and a movable eccentric weight shaft mounted with a movable eccentric weight, and is formed in an annular or arc shape along the base. At (N-1) positions between the N arranged rotary exciters, the fixed eccentric weight shafts of the rotary exciters are connected so as to rotate synchronously, and the movable eccentric weight shafts are connected. Are linked to rotate synchronously,
A motor is provided for rotationally driving the connected fixed eccentric weight shaft, and while transmitting the rotation of the connected fixed eccentric weight shaft to the connected movable eccentric weight shaft, A phase difference adjusting mechanism for increasing or decreasing the phase difference of the eccentric weight shaft is provided. According to the above-described apparatus of the fourth aspect, N rotary exciters arranged in an annular or arc shape face each other.
The fixed eccentric weights and the movable eccentric weights are connected to each other at (N-1) of the locations, so that the fixed eccentric weights of all the N exciters are mutually connected, and The movable eccentric weight shafts are forcibly rotated synchronously. However, since the N exciters do not connect all the N locations facing each other, the distortion (including torsional deformation) of each member receiving the rotational force is released at the end, and the rotation can be performed without difficulty. Therefore, there is no fear of inducing abnormal noise, heat generation, premature wear and seizure. Then, the connected N fixed eccentric weight shafts can be rotationally driven by one motor, and the connected N movable eccentric weight shafts are controlled in phase by one phase difference adjusting mechanism. Can be. By controlling the oscillating force by controlling the phase of the eccentric weight shaft, it is possible to prevent troubles related to resonance.

According to a fifth aspect of the invention, an N-shaped rotary exciter is mounted on an annular or arcuate base (where N is 3 or an integer of 3 or more). Each of the vibrators has a fixed eccentric weight shaft mounted with a fixed eccentric weight and a movable eccentric weight shaft mounted with a movable eccentric weight, and is formed in an annular or arc shape along the base. At (N-1) locations between the N arranged rotary exciters, the fixed eccentric weight shafts of the rotary exciters are connected so as to rotate synchronously, and the above-mentioned connected fixed A motor that rotationally drives the eccentric weight shaft is provided, and each of the N-group rotary exciters is configured to “transmit the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft, Phase difference adjustment mechanism that increases or decreases the phase difference of the eccentric weight shaft. With it kicked, individually when phase difference control mechanism, or wherein the operating system to operate brought cooperation with each other are provided. According to the apparatus of the fifth aspect described above, the N fixed eccentric weight shafts provided on each of the N exciters arranged in an annular or arc shape are connected to each other. And these N fixed eccentric shafts can be synchronously rotated by one motor. In this case, the number of connection points is not (N) but (N-1).
For the same reason as in the invention, there is no danger of generating abnormal noise, heat generation, and early wear in the structural part supporting the fixed eccentric weight shaft.

In the apparatus according to the fifth aspect,
For each of the N exciters, a “phase difference control mechanism that transmits and rotates the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft and increases or decreases the phase difference between the two eccentric weight shafts” is provided. Since an operation system for operating each phase difference control mechanism is provided, the phase difference with respect to the fixed eccentric weight shaft is increased or decreased while rotating the movable eccentric weight for each exciter, and the fixed eccentric weight is adjusted. By changing the total eccentric moment of the weight and the movable eccentric weight, the vibrating force can be controlled while the operation of the vibrator is continued. Thereby, it is possible to prevent troubles related to resonance between the exciter and the ground and troubles related to resonance between the exciter and the crane boom.

According to a sixth aspect of the present invention, the N rotary exciters are mounted on an annular or arcuate base (where N is 3 or an integer of 3 or more). Each of the machines has a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, and is arranged in an annular or arc shape along the base. At (N-1) places between the N rotary exciters, the fixed eccentric weight shafts of the rotary exciters are connected so as to rotate synchronously, and the movable eccentric weight shafts are connected to each other. At least two electric motors that are connected so as to rotate synchronously and that rotationally drive each of the connected fixed eccentric weight shaft and the connected movable eccentric weight shaft are provided. Two electric motors Function to rotate, and characterized in that it comprises a control means having a function of adjusting the phase difference between each other. According to the apparatus of the sixth aspect described above, (N-1) of N opposing rotary exciters arranged in an annular or arcuate manner,
Since the fixed eccentric weight shafts and the movable eccentric weight shafts are connected so as to rotate synchronously, N fixed eccentric weight shafts can be synchronously rotated by one electric motor and N Can be synchronously rotated by one electric motor different from the above. Further, since there is provided a control means for rotating the one electric motor and one electric motor different from the above synchronously and adjusting the phase difference, the rotation of the two electric motors in total is controlled. By controlling, the total eccentric moment is changed by increasing or decreasing the phase difference between the fixed eccentric weight and the movable eccentric weight for each of the N exciters, and the excitation force is increased while the exciter is operated. Increase / decrease control can be performed. By having such a function, by setting the vibrating force of the vibration exciter to zero in the rotational speed range that resonates with the ground and / or the rotational speed range that resonates with the crane boom, the vibrating force is reduced to less than the gravitational acceleration. By doing so, it is possible to prevent occurrence of troubles related to resonance.

According to a seventh aspect of the present invention, in addition to the constituent features of the first, second, fourth, or fifth aspect of the present invention, the phase difference adjusting mechanism is driven by fluid pressure. And a screw means for connecting the piston reciprocatingly driven by fluid pressure, the piston and the fixed eccentric weight shaft to convert reciprocating motion of the piston into relative rotation with the fixed eccentric weight shaft, and And / or a screw means for connecting the piston and the movable eccentric weight shaft to convert reciprocation of the piston into relative rotation with the movable eccentric weight shaft. According to the apparatus of the seventh aspect described above, the phase difference adjusting mechanism is driven by fluid pressure and does not use electricity. Even if the pile punching operation is a waterside operation or an underwater operation, an electric leakage accident occurs. There is no danger of occurrence. In many cases, a water jet is also used in combination with land staking, but the phase difference can be adjusted by applying the present invention even when the working environment is flooded by the water jet or when the work is performed during rain. Is performed, it is safe even if there is no risk of causing a leakage fault in the phase difference adjusting mechanism. Furthermore, since the phase difference is adjusted by converting the reciprocating motion of the piston into relative rotation, there is no possibility that the phase difference fluctuates as long as the piston is stationary at the reciprocating stroke end by the fluid pressure. The state of adjustment of the vibrating force is stable. In addition, since the phase difference is adjusted by fluid pressure,
Suitable for remote control.

In a preferred embodiment of the present invention, a plurality of rotary exciters are arranged on a base member provided with a pile chuck so that their rotation axes are aligned substantially concentrically. The fixed eccentric weight shafts of the respective exciters are connected to each other and are rotationally driven by a motor, and the movable eccentric weight shafts of the plurality of exciters are connected to each other, and the connected fixed eccentric weights are connected to each other. By transmitting the rotation of the weight shaft to the connected movable eccentric weight shaft and adjusting the phase difference between the two eccentric weight shafts, the total eccentricity of the fixed eccentric weight and the movable eccentric weight is adjusted. The present invention is characterized in that the exciting force is controlled by changing the moment. According to the above-described invention method of claim 8, the fixed eccentric weight shafts of the plurality of exciters arranged with the rotation axes concentrically arranged are mechanically restrained so as to rotate synchronously. Therefore, it can be rotationally driven by one motor. Further, since the movable eccentric weight shafts of a plurality of exciters are mechanically constrained to rotate synchronously, the total number of N exciters is "fixed eccentric weight and movable eccentric weight and Increase / decrease of the phase difference of "." Therefore, by transmitting the rotation of the connected fixed eccentric weight shaft to the connected movable eccentric weight shaft, there is no need to use a drive motor dedicated to the movable eccentric weight shaft, and the N motors can be controlled by one motor. Can be driven to operate. In addition, during the transmission, the total eccentric moment is increased or decreased by adjusting the phase difference between the fixed eccentric weight shaft, which is the transmission side, and the movable eccentric weight axis, which is the driven side. Without interrupting the vibration, it is possible to prevent the trouble related to resonance by controlling the vibrating force.

According to a ninth aspect of the present invention, a plurality of rotary exciters are arranged on a base member provided with a pile chuck with their rotation axes aligned substantially concentrically. The fixed eccentric weight shafts of the respective exciters are connected to each other and driven to rotate by a motor.
The movable eccentric weight shaft is rotationally driven by the fixed eccentric weight shaft,
In addition, at the time of the above-mentioned rotation drive, the total eccentric moment between the fixed eccentric weight and the movable eccentric weight is changed by increasing or decreasing the rotational phase difference of the movable eccentric weight axis with respect to the fixed eccentric weight axis to generate vibration. It is characterized by increasing and decreasing the force. According to the method of the ninth aspect of the present invention described above, the fixed eccentric weight shafts are connected to each other with respect to a plurality of exciters arranged with the rotating shafts being substantially concentrically arranged.
The fixed eccentric weight shafts of a plurality of exciters can be synchronously rotated by one motor. Then, since the movable eccentric weight shaft is rotationally driven by the fixed eccentric weight shaft for each exciter, the fixed eccentric weight axis and the movable eccentric weight axis of all the plurality of exciters are driven by the one motor. The eccentricity of the fixed eccentric weight and the movable eccentric weight is adjusted by adjusting the rotational phase difference between the fixed eccentric weight axis which is the driving side and the movable eccentric weight axis which is the driven side. Exciting force can be controlled by adjusting the moment.

According to a tenth aspect of the present invention, a plurality of rotary exciters are arranged on a base member provided with a pile chuck with their rotation axes aligned substantially concentrically. The fixed eccentric weight shafts of the respective exciters are connected to each other and driven to rotate by a motor, and the movable eccentric weight shafts of the plurality of exciters are connected to each other, and a motor different from the motor is used. Rotate and electrically control both motors to change the phase difference of the movable eccentric weight axis with respect to the fixed eccentric weight axis to increase or decrease the total eccentric moment of the fixed eccentric weight and the movable eccentric weight. It is characterized by doing. According to the method of the tenth aspect described above, the plurality of fixed eccentric weight shafts of each of the plurality of rotary exciters and the plurality of variable weight shafts of each of the plurality of rotary exciters are formed. The plurality of rotary motors are connected so as to rotate synchronously with each other, and are rotationally driven by mutually independent motors, and the mutually independent motors are electrically controlled to adjust the phase difference. The exciter vibrates up and down at the same time,
Since the vibrating force is simultaneously controlled to increase and decrease, it is effective in preventing vibration pollution and preventing damage to the crane due to resonance.

The method according to the eleventh aspect of the present invention is characterized in that when a pile is driven in or pulled out using a plurality of exciters having a fixed eccentric weight axis and a movable eccentric weight axis, The fixed eccentric weight shafts are arranged so as to be substantially tangential to the virtual arc, and are connected while being restrained so as to rotate synchronously with each other. It is driven to rotate, and the movable eccentric weight shafts of the respective exciters are arranged so as to be substantially tangential to the virtual arc and restrained and connected so as to rotate synchronously with each other. In addition to transmitting the rotation of the fixed eccentric weight shaft to rotate the connected movable eccentric weight shaft and increasing or decreasing the phase difference between the two eccentric weight shafts, the fixed eccentric weight and the movable eccentric weight are transmitted. Increase or decrease the total eccentric moment with the weight And controlling the vibratory force. According to the above-described method of the present invention, when a large steel pipe pile, in particular, a huge pile formed by connecting a plurality of columnar members is punched by a large number of vibration exciters, the large number of raised piles is required. Prevent vibration pollution caused by ground resonance by aligning the timing of vertical vibration of the shaker and increasing or decreasing the vibrating force of the vertical vibration, and prevent damage due to resonance of the crane boom. And the above-described operation can be performed by one drive motor and a set of “phase difference adjustable transmission mechanisms”.

According to a twelfth aspect of the present invention, when a pile is driven in or pulled out using a plurality of exciters having a fixed eccentric weight axis and a movable eccentric weight axis, The fixed eccentric weight shafts are arranged so as to be substantially tangential to the virtual arc, and are connected while being restrained so as to rotate synchronously with each other. The exciters which are driven to rotate and are not connected to each other and are forcibly synchronously rotated by connecting the movable eccentric weight shafts of the plurality of exciters in series, or for each exciter or in a group. For each of the groups, the movable eccentric weight shaft is driven to rotate by the fixed eccentric weight shaft, and the phase difference between the two eccentric weight shafts is increased or decreased to adjust the fixed eccentric weight and the movable eccentric weight. Increase or decrease the total eccentric moment And controlling the force.
According to the above-described method of the present invention, when a large steel pipe pile, particularly a huge pile formed by connecting a plurality of columnar members, is punched by a large number of vibration exciters, the large number of raised piles is required. Prevent vibration pollution caused by ground resonance by aligning the timing of vertical vibration of the shaker and increasing or decreasing the vibrating force of the vertical vibration, and prevent damage due to resonance of the crane boom. And the above-mentioned operation can be driven by one motor, and further, "all the movable eccentric weight shafts of the respective exciters are connected in series to forcibly rotate synchronously. Can be accomplished without the need for "binding."

According to a thirteenth aspect of the present invention, when a pile is driven in or pulled out by using a plurality of exciters having a fixed eccentric weight axis and a movable eccentric weight axis, each of the exciters has The fixed eccentric weight shafts are arranged so as to be substantially tangential to the virtual arc, and are connected while being restrained so as to rotate synchronously with each other. It is driven to rotate, and the movable eccentric weight shafts of the respective exciters are arranged so as to be substantially tangential to the virtual arc, and are restrained and connected so as to rotate synchronously with each other. While rotating the movable eccentric weight shaft by a motor different from the motor,
Electrically controlling both motors to change the phase difference of the movable eccentric weight axis with respect to the fixed eccentric weight axis, thereby increasing or decreasing the total eccentric moment of the fixed eccentric weight and the movable eccentric weight. And According to the above-described method of the present invention, when a large steel pipe pile, particularly a huge pile formed by connecting a plurality of columnar members, is punched by a large number of vibration exciters, the large number of raised piles is required. Prevent vibration pollution caused by ground resonance by aligning the timing of vertical vibration of the shaker and increasing or decreasing the vibrating force of the vertical vibration, and prevent damage due to resonance of the crane boom. The above operation can be performed by the electric control of the two motors without using the “mechanical transmission mechanism capable of adjusting the phase difference”.

[0035]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is an external front view, and FIG. 1B is a schematic sectional view. Referring to FIG. 1A, two rotary exciters 60
A and 60B are set on the base 61 and can be suspended via a spring 64. Below the base 61, two sets of chucks for piles (abbreviation / chuck)
62A and 62B are mounted to grip the steel pipe pile 63. In the example of FIG. 1, two exciters are installed.
A plurality of or more exciters may be installed. Referring to FIG. 1B, the rotary exciters 60A, 60
0B is provided with a phase difference control mechanism similar to the phase difference control mechanism shown in FIG. 7 described above, and the fixed eccentric weight shafts to which the A-system fixed eccentric weights 48 are fixed are connected by universal joints 65a. The two A-system fixed eccentric weights 48 </ b> A are synchronously driven by the A-system drive motor Ma. The two B-system movable eccentric weights 49 are also rotated synchronously by gear transmission. Similarly, the two B-system fixed eccentric weights 47 and the two A-system movable eccentric weights 46 are synchronously rotated by the B-system drive motor Mb and the universal joint 65b. To configure as above,
The two rotary exciters 60A and 60B are fixed on a base 61 with their rotation axes aligned substantially concentrically.

In the embodiment shown in FIG. 1, the two rotary exciters 60A and 60B can punch the pile strongly by synchronizing the vibrations in the vertical direction. Further, as described with reference to FIG. 7, by controlling the two motors Ma and Mb electrically to adjust the phase difference between the fixed eccentric weight and the movable eccentric weight, the total eccentric moment of both the eccentric weights is adjusted. Can be increased or decreased, so that the vibration-causing force can be made zero in a frequency range in which a trouble due to resonance occurs, thereby preventing a trouble related to resonance. It should be noted that even if the vibration acceleration is not completely reduced to zero, the vibration acceleration is changed to the gravitational acceleration (980 cm / sec.
Seconds) or less can avoid troubles related to resonance.

FIGS. 2A and 2B show an embodiment different from FIG. 1 described above, wherein FIG. 2A is an external front view and FIG. 2B is a schematic sectional view. The outline of the difference between the embodiment of FIG. 2 and the embodiment of FIG. 1 described above is as follows. This embodiment (FIG. 2) is similar to the phase difference adjusting mechanism shown in FIG. Two rotary exciters 60 each having a phase difference adjusting mechanism 66
A and 60B are aligned concentrically, and the fixed eccentric weight 4
6 'and the eccentric weight shafts are connected by a universal joint 56a, and the two fixed eccentric weights 46' are synchronously rotated by the drive motor 50. For convenience of explanation, these fixed eccentric weights 46 ′ directly connected to the drive motor 50 are connected to the drive-side fixed eccentric weight 4.
Called 6 '. The phase difference control mechanism 66 shown in FIG. 2 is similar to the phase difference adjustment mechanism shown in FIG. 8 (unknown invention according to the prior application), and reciprocates the annular piston of the hydraulic cylinder. Is converted into relative rotation by screw means. As shown in FIG. 2B, the two exciters 60A and 60B are driven to rotate the fixed eccentric weight by one drive motor 50, and each of the two exciters is A fixed eccentric weight rotational phase difference adjusting mechanism 66 is provided and transmitted to the movable eccentric weight 49 '. For convenience of explanation, these movable eccentric weights 49 'are referred to as control-side movable eccentric weights 49'. An operation system (not shown) for adjusting the two sets of phase difference adjustment mechanisms 66 in conjunction with each other is provided, or an operation system (not shown) for individually adjusting the two sets of phase difference adjustment mechanisms 66 is provided and linked. As in the above-described embodiment (FIG. 1), the total eccentric moment is increased or decreased to control the excitation force, thereby preventing troubles due to resonance.

FIG. 3 shows a vibrating pile punching apparatus which is an improvement of the embodiment shown in FIG. 2 described above, and FIG.
(B) is a schematic sectional view. In the embodiment of FIG. 2 described above, only the fixed eccentric weight shafts of the two vibration exciters 60A and 60B are restrained and connected so as to rotate synchronously,
Although the phase difference of the movable eccentric weight is transmitted and controlled for each exciter, in the embodiment of FIG. 3, two exciters 60A,
The fixed eccentric weight shafts of 60B were connected by a universal joint 65a, and the movable eccentric weight shafts were also connected by a universal joint 65b. The rotation of the connected fixed eccentric weight shaft is transmitted to the movable eccentric weight shaft via the phase difference adjusting mechanism 66, and the phase difference between the two eccentric weight shafts can be adjusted. According to this embodiment (FIG. 3), not only one drive motor 50 is sufficient, but also the phase difference adjusting mechanism 6
6 is enough for one set. For this reason, the operation system (not shown) of the phase difference adjusting mechanism is simplified, and the operation reliability is high.

As shown in FIG. 9B, a case where a large number of vibration exciters 60 are mounted on a huge assembled pile 71 formed by connecting a large number of steel sheet piles to perform a punching operation of the pile. State. FIG. 4 is a plan view schematically illustrating a state in which six rotary exciters are attached to one huge sheet pile assembly pile to perform a punching operation of the pile. However, it is not a strictly accurate plan view because it is schematically drawn. This FIG.
This figure shows the arrangement of the base exciters 60C to 60H and their connected state, and the illustration of the rotation drive means and the phase difference control mechanism is omitted. An imaginary circle S concentric with the plane figure of the sheet pile assembling pile 71 is assumed in construction design, and this circle S
Fixed eccentric weight shaft 67 of each exciter for the arc of
The six exciters are arranged so that c-67h and the movable eccentric weight shafts 68c-68h are substantially tangential or parallel to the tangent, and are mounted on the sheet pile assembly pile 71.
As a specific method of mounting, a ring-shaped base member (not shown) corresponding to the base 61 in the above-described embodiment of FIGS.
(See FIG. 9B).

When the N groups of exciters are arranged as described above, N places where the fixed eccentric weight shafts of the adjacent exciters face each other, and N places where the movable eccentric weight shafts face each other are N places. I can do it in several places. One of these N locations was removed (N-
1) At the point, the fixed eccentric weight shafts are restrained and connected so as to rotate synchronously by the propeller shaft 69 and the universal joint, and the movable eccentric weight shafts are synchronously rotated by the propeller shaft 70 and the universal joint. And connect as follows. Accordingly, the connected eccentric weight shaft does not form an annular shape but forms a C-shape. The reason for this configuration is that (a) a C-shaped connection is sufficient for synchronous rotation even if it is not annular, and (b) if it is annular, various errors and elastic deformations overlap, and In view of the fact that unexpected unbalanced load is applied to the member to cause abnormal noise and heat generation, which often impairs the durability, this is prevented beforehand.

Next, the rotational drive and the phase difference control of the six vibrators will be described. The fixed eccentric weight shafts 67c to 67h of each of the six exciters have a propeller shaft 69.
When a drive motor Ma is connected to the end or the intermediate portion, for example, as shown in the drawing,
The fixed eccentric weights of the six vibration exciters can be rotationally driven by one motor. Similarly, the movable eccentric weights of the six vibration exciters can be driven to rotate by one motor Mb. With this configuration, the vibrating force is controlled in the same manner as in the case where the two motors Ma and Mb are electrically controlled to increase or decrease the vibrating force in the phase difference control mechanism shown in FIG. ,
Trouble due to resonance can be prevented.

An embodiment different from the above will be described next with reference to FIG. Of the two drive motors Ma and Mb, the motor Mb for rotating and driving the movable eccentric weight is removed, and a hydraulic cylinder similar to the phase difference adjusting mechanism in FIG. 8 (unknown prior invention) is used. A phase difference adjusting mechanism 66 using a screw means is installed and connected between the propeller shafts 69 and 70, and the rotation of the fixed eccentric weight shaft is moved by the phase difference adjusting mechanism 66 to the movable eccentric weight. When the power is transmitted to the shafts and the phase difference between the two eccentric weight shafts is increased or decreased, one drive motor Ma and one set of the phase difference adjusting mechanism 6 are driven.
6 allows the six rotary exciters 60C to 60H to cooperate with each other to perform the punching work of the piles strongly, and to control the exciting force to prevent troubles related to resonance.

Next, another embodiment will be described with reference to FIG. Two motors M shown
a, Mb, a motor Mb that rotationally drives a movable eccentric weight
And (N-1) propeller shafts 70 (propeller shafts for connecting a movable eccentric weight shaft; N-1 = 5 in this embodiment). Each of the N-group rotary exciters 60C to 60H is similar to the rotary exciters 60A and 60B shown in FIG.
It is assumed that each has a phase difference adjusting mechanism 66. The specific configuration of this phase difference adjusting mechanism is similar to the phase difference adjusting mechanism shown in FIG. 8 (unknown prior invention), in which the reciprocating motion of the hydraulic cylinder is relatively rotated by screw means. It has a structure to convert. With this configuration, the number of propeller shafts connecting the N exciters is (N−
1) A book is sufficient, and an operation system for adjusting each of the N phase difference adjustment mechanisms individually or in conjunction with each other is provided, and the N exciters are cooperated to perform the punching work of the pile strongly. In addition, it is possible to prevent the trouble relating to resonance by controlling the vibrating force.

[0044]

As described above, the configuration and function of the embodiment of the present invention have been clarified. According to the apparatus of the present invention, the fixed eccentric weight shafts of the plurality of rotary exciters are connected to each other. Are arranged in a substantially straight line, it is easy to connect them so as to rotate them synchronously, and there is a possibility that noise is generated from the joint portion, the joint portion generates heat, and the bearing portion is seized. There is no. Since these fixed eccentric weight shafts are connected to each other, a plurality of fixed eccentric weight shafts can be rotationally driven by one motor. Further, a plurality of movable eccentric weights are connected so as to rotate synchronously with each other, and these connected movable eccentric weight shafts are transmitted from the fixed eccentric weight shaft and rotated, so that a plurality of movable eccentric weights are rotated. The structure is simple because it is sufficient to provide one drive motor for the whole vibration pile punching device provided with the rotary exciter. The small number of drive motors installed as described above simplifies the wiring or piping system for supplying energy to the drive motors, so that maintenance and maintenance are easy, the trouble occurrence rate is reduced, and the operation reliability is reduced. There are many places that contribute to the improvement of practical value, such as rising. Further, since the connected movable eccentric weight shafts are adjusted to increase or decrease the phase difference with respect to the fixed eccentric weight shafts while the movable eccentric weight shafts rotate synchronously, the fixed eccentric weights for each exciter are accordingly adjusted. The phase difference between the weight and the movable eccentric weight and the total eccentric moment increase or decrease, and the vibrating force changes. Since the change in the excitation force can be performed while the operation of the rotary exciter is continued, it is possible to prevent troubles related to resonance with the ground or the crane boom.

According to the second aspect of the present invention, since the fixed eccentric weight shafts of the plurality of rotary exciters are arranged substantially in a straight line, it is easy to connect them so as to rotate synchronously. Therefore, there is no fear that noise is generated from the joint portion, heat is generated in the joint portion, or the bearing portion is seized. Since these fixed eccentric weight shafts are connected to each other, a plurality of fixed eccentric weight shafts can be rotationally driven by one motor. In addition, each of the plurality of rotary exciters is provided with a “phase difference adjustment mechanism that transmits and rotates the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft and increases or decreases the phase difference between the two eccentric weight shafts”. In addition, since there is provided an operation system for operating these phase difference adjusting mechanisms, there is no need to provide a motor for phase difference control in each exciter, and a fixed eccentric weight and a movable eccentric weight are provided for each exciter. By changing the total eccentric moment with the weight, the vibrating force can be controlled to increase or decrease. Thereby, it is possible to prevent troubles relating to resonance with the ground and resonance with the crane boom.

According to the third aspect of the present invention, the fixed eccentric weight shafts and the movable eccentric weight shafts of the plurality of vibration exciters are connected in a straight line and connected to each other. The weight shaft is rotated synchronously. Since the plurality of movable eccentric weight shafts are arranged in a straight line and connected to each other, the plurality of movable eccentric weights are synchronously rotated. Further, since each of the series of fixed eccentric weight shafts and the series of movable eccentric weight shafts is rotationally driven by an electric motor capable of controlling a rotational phase difference, the fixed eccentric weights mounted on the fixed eccentric weight shafts The phase difference between the weight and the movable eccentric weight mounted on the movable eccentric weight shaft and the total eccentric moment can be increased or decreased. As a result, the exciter can be increased or decreased and adjusted while continuing to operate the exciter without stopping, so that the rotational speed range at which there is a risk of resonance with the ground, and / or the vibration with the crane boom can be adjusted. By setting the vibrating force to zero (or less than the gravitational acceleration) in the rotational speed range where there is a danger of
Trouble caused by the resonance phenomenon can be prevented.

According to the device of the fourth aspect of the present invention, the N eccentric weights and the N eccentric rotary exciters arranged in an annular or arcuate form (N-1) out of N opposing locations. Since the movable eccentric weights are mutually connected, the fixed eccentric weight shafts of all the N exciters and all the movable eccentric weight shafts are forcibly rotated synchronously. However, since the N exciters do not connect all the N locations facing each other, the distortion (including torsional deformation) of each member receiving the rotational force is released at the end, and the rotation can be performed without difficulty. Therefore, there is no fear of inducing abnormal noise, heat generation, premature wear and seizure. Then, the connected N fixed eccentric weight shafts can be rotationally driven by one motor,
The phase of the connected N movable eccentric weight shafts can be controlled by one phase difference adjusting mechanism. By controlling the oscillating force by controlling the phase of the eccentric weight shaft, it is possible to prevent troubles related to resonance.

According to the fifth aspect of the present invention, the N fixed eccentric weight shafts provided on each of the N groups of exciters arranged in an annular or arc shape are connected to each other. These N fixed eccentric shafts can be rotated synchronously by one motor. In this case, the number of connection points is not (N) but (N-1).
For the same reason as in the invention, there is no danger of generating abnormal noise, heat generation, and early wear in the structural part supporting the fixed eccentric weight shaft.

In the apparatus according to the fifth aspect,
For each of the N exciters, a “phase difference control mechanism that transmits and rotates the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft and increases or decreases the phase difference between the two eccentric weight shafts” is provided. Since an operation system for operating each phase difference control mechanism is provided, the phase difference with respect to the fixed eccentric weight shaft is increased or decreased while rotating the movable eccentric weight for each exciter, and the fixed eccentric weight is adjusted. By changing the total eccentric moment of the weight and the movable eccentric weight, the vibrating force can be controlled while the operation of the vibrator is continued. Thereby, it is possible to prevent troubles related to resonance between the exciter and the ground and troubles related to resonance between the exciter and the crane boom.

According to the apparatus of the sixth aspect of the present invention, the N eccentric weight spindles and the N eccentric rotary exciters arranged in an annular or arcuate form (N-1) out of N opposing locations. Since the movable eccentric weight shafts are connected so as to rotate synchronously, the N fixed eccentric weight shafts can be synchronously rotated by one electric motor, and the N movable eccentric weight shafts can be rotated. It can be rotated synchronously by one electric motor different from the above. Further, since there is provided a control means for rotating the one electric motor and one electric motor different from the above synchronously and adjusting the phase difference, the rotation of the two electric motors in total is controlled. By controlling, the total eccentric moment is changed by increasing or decreasing the phase difference between the fixed eccentric weight and the movable eccentric weight for each of the N exciters, and the excitation force is increased while the exciter is operated. Increase / decrease control can be performed. By having such a function, by setting the vibrating force of the vibration exciter to zero in the rotational speed range that resonates with the ground and / or the rotational speed range that resonates with the crane boom, (or the vibrating force is less than the gravitational acceleration By doing so, it is possible to prevent occurrence of troubles related to resonance.

According to the seventh aspect of the present invention, the phase difference adjusting mechanism has a structure driven by a fluid pressure and does not use electricity. Even if the pile punching operation is a waterside operation or an underwater operation, an electric leakage accident occurs. There is no danger. In many cases, water jets are also used for land pile driving,
Even when the work environment is flooded by the water jet or when the work is performed during rainfall, if the phase difference is adjusted by applying the present invention, there is no possibility that a leakage accident may occur in the phase difference adjustment mechanism. Safe. Furthermore, since the phase difference is adjusted by converting the reciprocating motion of the piston into relative rotation, there is no possibility that the phase difference fluctuates as long as the piston is stationary at the reciprocating stroke end by the fluid pressure. The state of adjustment of the vibrating force is stable. In addition, since the phase difference is adjusted by fluid pressure, it is suitable for remote control.

According to the eighth aspect of the present invention, the fixed eccentric weight shafts of the plurality of exciters arranged with the rotation axes concentrically are mechanically restrained so as to rotate synchronously. It can be driven to rotate by one motor.
Further, since the movable eccentric weight shafts of a plurality of exciters are mechanically constrained to rotate synchronously, the total number of N exciters is "fixed eccentric weight and movable eccentric weight and Increase / decrease of the phase difference of "." Therefore, by transmitting the rotation of the connected fixed eccentric weight shaft to the connected movable eccentric weight shaft, there is no need to use a drive motor dedicated to the movable eccentric weight shaft, and the N motors can be controlled by one motor. Can be driven to operate. In addition, during the transmission, the total eccentric moment is increased or decreased by adjusting the phase difference between the fixed eccentric weight shaft, which is the transmission side, and the movable eccentric weight axis, which is the driven side. Without interrupting the vibration, it is possible to prevent the trouble related to resonance by controlling the vibrating force.

According to a ninth aspect of the present invention, there are provided a plurality of exciters arranged so that their rotation axes are substantially concentric.
Since the fixed eccentric weight shafts are connected to each other, the fixed eccentric weight shafts of a plurality of exciters can be synchronously rotated by one motor. Then, since the movable eccentric weight shaft is rotationally driven by the fixed eccentric weight shaft for each exciter, the fixed eccentric weight axis and the movable eccentric weight axis of all the plurality of exciters are driven by the one motor. The eccentricity of the fixed eccentric weight and the movable eccentric weight is adjusted by adjusting the rotational phase difference between the fixed eccentric weight axis which is the driving side and the movable eccentric weight axis which is the driven side. Exciting force can be controlled by adjusting the moment.

According to the tenth aspect of the present invention, a plurality of fixed eccentric weight shafts of each of the plurality of rotary exciters,
The plurality of variable weight shafts of each of the plurality of rotary exciters are connected so as to rotate synchronously with each other, are rotationally driven by mutually independent motors, and the mutually independent motors are electrically driven. The plurality of rotary exciters are vibrated up and down at the same timing, and the vibrating force is controlled to increase or decrease at the same time, so that the vibration exciter is controlled. It is also effective in preventing the crane from being damaged due to resonance.

According to the eleventh aspect of the present invention, when a large steel pipe pile, particularly a huge pile formed by connecting a plurality of columnar members, is punched by a large number of vibration exciters, the large number of vibrations are generated. To prevent vibration pollution caused by ground resonance by aligning the timing of vertical vibration of the machine and increasing or decreasing the vibration generating force of the vertical vibration, and to prevent damage due to resonance of the crane boom. In addition, the above-described operation can be performed by one driving motor and a set of “phase difference adjustable transmission mechanism”.

According to the twelfth aspect of the present invention, when a large steel pipe pile, particularly a huge pile formed by connecting a plurality of columnar members, is punched by a large number of vibration exciters, the large number of vibrations are generated. To prevent vibration pollution caused by ground resonance by aligning the timing of vertical vibration of the machine and increasing or decreasing the vibration generating force of the vertical vibration, and to prevent damage due to resonance of the crane boom. And the above-mentioned operation can be driven by one motor, and furthermore, "all of the movable eccentric weight shafts of the respective exciters are connected in series and constrained to forcibly rotate synchronously. Doing "is not required.

According to the thirteenth aspect of the present invention, when a large steel pipe pile, particularly a huge pile formed by connecting a plurality of columnar members, is punched by a large number of vibration exciters, the large number of vibrations are generated. To prevent vibration pollution caused by ground resonance by aligning the timing of vertical vibration of the machine and increasing or decreasing the vibration generating force of the vertical vibration, and to prevent damage due to resonance of the crane boom. The above-mentioned operation can be performed by the electric control of the two motors without using the “mechanical transmission mechanism capable of adjusting the phase difference”.

[Brief description of the drawings]

1A and 1B show an embodiment of the present invention, wherein FIG. 1A is an external front view, and FIG. 1B is a schematic sectional view.

FIGS. 2A and 2B show an embodiment different from FIG. 1 described above, wherein FIG. 2A is an external front view and FIG. 2B is a schematic sectional view.

FIGS. 3A and 3B show a vibration pile punching device improved from the embodiment shown in FIG. 2 described above, wherein FIG. 3A is an external front view and FIG. 3B is a schematic sectional view.

FIG. 4 is a plan view schematically illustrating a state in which six rotary exciters are mounted on one huge pile pile assembly pile to perform a punching operation of the pile. However, it is not a strictly accurate plan view because it is schematically drawn.

FIG. 5 is a view for explaining a problem of resonance in a vibration pile punching operation. FIG. 5 (A) shows a case where a rotary type vibrator is suspended by a crane boom to perform vibration punching of a pile. FIG. 4B is a cross-sectional view schematically illustrating a state in which the vibrations are present. FIG.

FIG. 6 is a schematic diagram for explaining adjustment of a vibrating force in a rotary vibration exciter having a fixed eccentric weight and a movable eccentric weight, and FIG. And (B)
Represents a state of moderate excitation force, (C) represents a state of low excitation force, and (D) represents a state of zero excitation force.

FIG. 7 is a schematic cross-sectional view of a rotary exciter provided with a known phase control mechanism, which is deformed and drawn to facilitate understanding of the structure and function, and thus is an accurate JIS standard projection view. is not.

FIG. 8 shows an unknown phase difference adjusting mechanism (Japanese Patent Application No. 8-3456).
20) is a schematic cross-sectional view of a rotary exciter provided with No. 20).

FIG. 9 shows two examples in which a plurality of exciters are mounted on one pile, (A) is a perspective view of a state in which two exciters are mounted on one steel pipe pile and suspended. (B) is a perspective view of a state in which a large number of exciters are mounted and suspended on the upper end of a set of pile piles in which a large number of steel sheet piles are arranged in a cylindrical shape and connected.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Rotary shaft, 3 ... Eccentric weight, 4 ... Synchronous rotation transmission gear, 5 ... Crane boom, 6 ... Exciter, 6a ...
Chuck, 7: pile, 8: private house, 9: fixed eccentric weight, 10
... Movable eccentric weight, 21 ... A system rotating shaft, 22 ... B system rotating shaft, 23 ... A system driving gear, 24 ... Key, 25 ... A system driven gear, 27 ... B system movable eccentric weight, 28 ... B System fixed eccentric weight, 29 ... A system movable eccentric weight, 30 ... Synchronous connecting rod, 31 ... B system driven gear, 33 ... Synchronous connecting rod, 3
4 ... A system drive gear, 35 ... A system driven pulley, 36 ...
B-system driven pulley, 37: winding transmission means, 43: casing, 44: eccentric weight shaft, 45: double shaft, 45a: outer tube, 45b: inner shaft, 46: A-system movable eccentric weight, 46 '
... Drive side fixed eccentric weight, 47 ... B system fixed eccentric weight, 4
7 '... control side fixed eccentric weight, 48 ... A system fixed eccentric weight, 48' ... drive side movable eccentric weight, 49 ... B system movable eccentric weight, 49 '... control side movable eccentric weight, 50 ... Drive motor, 51 hydraulic cylinder, 52 annular piston, 54
Spiral groove, 55: spiral groove in reverse twist direction, 56: tubular member, 6
0A to 60H: rotary type vibration exciter, 61: base, 6
2A, 62B: Pile chuck, 63: Steel pipe pile, 64: Spring, 65a, 65b: Universal joint, 66: Phase difference adjusting mechanism, 67c to 67h: Fixed eccentric weight spindle, 68c to 6
8h: movable eccentric weight shaft, 69, 70: propeller shaft, 71: sheet pile assembly pile, 72: base, 73: annular frame.

Claims (13)

[Claims] 1. A vibrating pile punching device in which a pile chuck is installed below a beam-shaped base member and a plurality of rotary exciters are installed on the beam-shaped base member. The rotary exciter includes a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, respectively. The competitors position the fixed eccentric weight axes substantially in a straight line and the movable eccentric weight axes are positioned almost in a straight line, and the aligned fixed eccentric weight axes are synchronized with each other. A motor that is connected to rotate, and that the movable eccentric weight shafts arranged in a straight line are connected so as to rotate synchronously with each other, and a motor that rotationally drives the connected fixed eccentric weight shaft, and Of connected fixed eccentric weight spindle Rolling, as well as transmission to the linked movable eccentric weight shaft, characterized in that it comprises a mechanism for adjusting the phase difference between both the eccentric weight shaft, vibration pile punching device. 2. A vibrating pile punching device in which a pile chuck is installed below a beam-shaped base member and a plurality of rotary exciters are installed on the beam-shaped base member. The rotary exciter includes a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, respectively. Comrades are arranged with the fixed eccentric weight shafts positioned substantially linearly, and the fixed eccentric weight shafts arranged in a straight line are connected so as to rotate one by one, and these A motor for rotationally driving the connected fixed eccentric weight shaft is provided.For each of the plurality of rotary exciters, `` while transmitting the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft, Phase difference adjuster for increasing or decreasing the phase difference of the eccentric weight shaft A vibratory pile punching device, characterized by being provided with an operating system for operating each phase difference adjusting mechanism individually or in cooperation with each other. 3. A vibrating pile punching device in which a pile chuck is installed below a beam-shaped base member and a plurality of rotary exciters are installed on the beam-shaped base member. The rotary exciter includes a fixed eccentric weight shaft mounted with a fixed eccentric weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, respectively. Comrades are connected by positioning the fixed eccentric weight shaft and the movable eccentric weight shaft substantially in a straight line, and an electric motor that rotationally drives the fixed eccentric weight shaft and an electric motor that rotationally drives the movable eccentric weight. A vibratory pile punching device, characterized in that both electric motors are controlled in rotational phase difference. 4. An N-shaped rotary exciter is mounted on an annular or arcuate base (where N is 3 or an integer of 3 or more), and each of the N-group rotary exciters has a fixed eccentricity. It comprises a fixed eccentric weight shaft mounted with a weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, and N arranged in an annular or arc shape along the base.
At (N-1) locations between the original rotary exciters, the fixed eccentric weight shafts of the rotary exciters are connected to rotate synchronously, and the movable eccentric weight shafts rotate synchronously. And a motor for rotating and driving the connected fixed eccentric weight shaft, and rotating the connected fixed eccentric weight shaft to the connected movable eccentric weight shaft. A vibratory pile punching device, which is provided with a phase difference adjusting mechanism for increasing and decreasing the phase difference between the two eccentric weight shafts while transmitting power to the shaft. 5. An N-shaped rotary exciter is mounted on an annular or arcuate base (where N is 3 or an integer of 3 or more), and each of the N-type rotary exciters has a fixed eccentricity. It comprises a fixed eccentric weight shaft mounted with a weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, and N arranged in an annular or arc shape along the base.
At (N-1) locations between the original rotary exciters, the fixed eccentric weight shafts of the rotary exciters are connected so as to rotate synchronously, and the above-mentioned connected fixed eccentric weight shafts are connected. A motor for rotating the eccentric weight shaft is provided, and each of the N-group rotary vibration exciters is configured to transmit "the rotation of the fixed eccentric weight shaft to the movable eccentric weight shaft, Phase difference adjustment mechanism to increase or decrease the phase difference of
And an operating system for operating each phase difference control mechanism individually or in cooperation with each other is provided. 6. An N-shaped rotary exciter is mounted on an annular or arcuate base (where N is 3 or an integer of 3 or more), and each of the N-type rotary exciters has a fixed eccentricity. It comprises a fixed eccentric weight shaft mounted with a weight, and a movable eccentric weight shaft mounted with a movable eccentric weight, and N arranged in an annular or arc shape along the base.
At (N-1) locations between the original rotary exciters, the fixed eccentric weight shafts of the rotary exciters are connected to rotate synchronously, and the movable eccentric weight shafts rotate synchronously. And at least two of the fixed eccentric weight shafts connected to each other and the movable eccentric weight shafts connected to each other are rotationally driven.
A plurality of electric motors, and a control unit having a function of rotating these two electric motors in synchronization with each other and a function of adjusting a phase difference between the two electric motors. Pile punching device. 7. The structure in which the phase difference adjusting mechanism is driven by fluid pressure, wherein the piston is reciprocally driven by fluid pressure, and the piston is connected to a fixed eccentric weight shaft to reciprocate the piston. Screw means for converting the movement into relative rotation with the fixed eccentric weight shaft and / or the piston and the movable eccentric weight shaft are connected to reciprocate the piston relative to the movable eccentric weight shaft. The vibrating pile punching device according to any one of claims 1, 2, 4, and 5, further comprising a screw means for converting the motion into motion. 8. A plurality of rotary exciters are arranged on a base member provided with a pile chuck with their rotating shafts substantially concentrically arranged, and the fixed eccentric weights of the plurality of exciters are respectively set. The weight shafts are mutually connected and driven to rotate by a motor, and the movable eccentric weight shafts of the plurality of vibrators are connected to each other, and the rotation of the connected fixed eccentric weight shaft is Of the fixed eccentric weight and the movable eccentric weight by changing the phase difference between the two eccentric weight axes while transmitting to the connected movable eccentric weight axis. Control method for punching a vibrating pile. 9. A plurality of rotary exciters are arranged on a base member provided with a pile chuck, with their rotating shafts being substantially concentrically aligned, and the fixed eccentric weight of each of the plurality of exciters is set. The weight shafts are connected to each other and are rotationally driven by a motor. For each exciter, the movable eccentric weight shaft is rotationally driven by a fixed eccentric weight shaft. The vibration is characterized by changing the rotational phase difference of the movable eccentric weight shaft with respect to the shaft, thereby changing the total eccentric moment of the fixed eccentric weight and the movable eccentric weight to increase or decrease the vibrating force. Pile punching control method. 10. A plurality of rotary exciters are arranged on a base member provided with a pile chuck with their rotation axes aligned substantially concentrically, and a fixed eccentric weight of each of the plurality of exciters is provided. The weight shafts are connected to each other and are rotationally driven by a motor. The plurality of vibrators are connected to each other by the movable eccentric weight shafts, and are driven to rotate by a motor different from the motor. Electrically controlling the phase difference of the movable eccentric weight axis with respect to the fixed eccentric weight axis to increase or decrease the total eccentric moment of the fixed eccentric weight and the movable eccentric weight. Pile punching control method. 11. When a pile is driven in or pulled out using a plurality of exciters having a fixed eccentric weight axis and a movable eccentric weight axis, the fixed eccentric weight axes of the respective exciters are assumed to be virtual. Are arranged so that they are almost tangential to the circular arc of each other, are connected so that they rotate synchronously with each other, and these connected fixed eccentric weight shafts are rotationally driven by motors to generate vibrations. The movable eccentric weight shaft of the machine is arranged so as to be substantially tangential to the virtual arc, and restrained and connected so as to rotate synchronously with each other. Rotation of the connected fixed eccentric weight shaft To rotate the connected movable eccentric weight shaft and increase or decrease the phase difference between the two eccentric weight shafts, thereby reducing the total eccentric moment of the fixed eccentric weight and the movable eccentric weight. Controlling the excitation force by increasing or decreasing The control method of punching a vibrating pile. 12. When driving or pulling out a pile using a plurality of exciters having a fixed eccentric weight axis and a movable eccentric weight axis, the fixed eccentric weight axes of the respective exciters are virtual. Are arranged so as to be substantially tangential to the arc of the circle, and are connected so as to rotate synchronously with each other, and these connected fixed eccentric weight shafts are rotationally driven by a motor, and the plurality of Fixed eccentricity for each exciter or for each group of exciters, without constraining the movable eccentric weight shafts of the exciter to be connected in series and forcibly rotating synchronously The movable eccentric weight shaft is driven to rotate by the weight shaft and the phase difference between the two eccentric weight shafts is increased or decreased to increase or decrease the total eccentric moment between the fixed eccentric weight and the movable eccentric weight. It is characterized by controlling vibration To, the control method of the vibration pile punching. 13. When a pile is driven in or pulled out using a plurality of exciters having a fixed eccentric weight axis and a movable eccentric weight axis, the fixed eccentric weight axes of the respective exciters are virtual. Are arranged so that they are almost tangential to the circular arc of each other, are connected so that they rotate synchronously with each other, and these connected fixed eccentric weight shafts are rotationally driven by motors to generate vibrations. The movable eccentric weight shaft of the machine is arranged so as to be substantially tangential to the virtual circular arc, and is restrained and connected so as to rotate synchronously with each other. While rotationally driven by a motor different from the motor, the two motors are electrically controlled to change the phase difference of the movable eccentric weight axis with respect to the fixed eccentric weight axis, and the fixed eccentric weight and the movable eccentric weight are The total eccentric moment of A method for controlling the punching of a vibrating pile, characterized by reducing the amount of adjustment.