JPS5826118A - Vibratory pile driver - Google Patents

Abstract

PURPOSE:To raise vibration frequency for making hard the propagation of ground vibration by using a system in which eccentric rollers are eccentrically rolled while contacting with each other to generate vibration in the vibrator for a pile driver. CONSTITUTION:In a vibrator, the first drive arms 34 and 35 are rotationally driven through a drive shaft 24, gears 25 and 28, and first eccentric roller drive shaft 30 by means of a drive motor 32, and thereby the second drive arms 36 and 37 are rotationally driven through a gear (not illustrated) engaging with the gear 25 and the second eccentric roller drive shaft 31. By this, the first and second eccentric rollers 40 and 41 are eccentrically turned while rollingly contacting with the cylindrical inner walls of the first and second guide cylinders 42 and 43 to generate vibration. Since, at the time, the centrifugal forces of the eccentrical rollers 40 and 41 are received by the guide cylinders 42 and 43, the life of the bearings can be elongated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a vibratory pile driver, specifically, a vibrating pile driver for driving construction piles into the soil at a construction site, for example, or
This article relates to a vibrating pile driver for driving and pulling out temporary piles at construction sites.

Conventionally, the vibratory pile driver, which has a vibration force of 20 to 30 tons and is most commonly used at construction sites, has a wave number between vibrations of 15 to 26 Hm, or at most 30 Hz, which is relatively low. The disadvantage was that ground vibrations were easily transmitted. And, the t used in such a conventional vibrating pile driver
The principle structure of the Vh vibration generator is to rotate an eccentric weight on a shaft supported by a bearing and utilize the resulting centrifugal force. In order to make the direction unidirectional, two sets or 20 times i sets of the above-mentioned shaft and eccentric weight are prepared, and the respective rotation directions and phases are set in opposite directions and phases. In such a configuration, in order to avoid vibration division, even if the eccentric weight is designed to have a high rotational speed and a high excitation lI, the radial load applied to the bearing K will be as low as the elbow. If there are 4 bearings in a vibratory pile driver with a large value, e.g. 24 t of excitation force, 11
cti.

6t as a light value that divides the excitation force of 24t by 4 bearings
Since the load will be applied to the bearing, the bearing to support this needs to be durable, but the high speed and high load will result in an extremely short lifespan, making this impractical. Ta. Figure 1 shows an example of the internal structure of the vibrating section of such a conventional vibratory pile driver, in which a semicircular eccentric weight 1
．． 2.3 are provided on the main shafts 4 and 5, respectively.

These eccentric weights 1.2.3 are equipped with a synchronizing gear 6. so that each shaft has the same amount of eccentric moment and rotates at the same number of revolutions and in opposite phases.
connected by 7. In order to rotationally drive these shafts, a boot IJ-8 is provided at the end of the shaft, and is connected to a motor (not shown) via a belt or an idle gear.

The vibration generated by such a mechanism is received by the vibration generator case 9 through the bearing, and the chuck mounting base 10
Vibration is applied to the pile through a chuck (not shown) attached to the pile. Conventional vibratory pile drivers configured in this manner have the drawback that, as described above, the load applied to the bearings is large, so the vibration frequency cannot be increased, and ground vibrations are easily transmitted.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks of the conventional art, an object of the present invention is to provide eccentric rollers that move eccentrically while rolling in contact with at least one pair of cylindrical inner walls, and to rotate the eccentric rollers in opposite directions. , and if the inner wall is rolled in contact with the inner wall in such a manner that the eccentric directions are opposite to each other, the vibration frequency can be increased, which makes it difficult for ground vibration to propagate, thereby reducing vibration pollution. Kah offers a low vibration pile driver.

The present invention will be explained below with reference to illustrated embodiments.

The vibrating pile driver of the present invention shown in FIG.
The chuck 21 grips the pile, vibrates the pile, and drives the pile into the soil. In addition, a suspension ring 23 is connected to the upper part of the vibration generating section 2o via a shock absorber 22.
is provided. This one wheel is 23t; j This is a rounded type that can be hooked by a crane or the like to hang the vibrating pile driver, and move and fix it to the desired position. This is to prevent the vibrations that may occur in the crane from being transmitted to the crane or the like. The vibration generator 20 includes a first tuning gear 25 that is integrally connected to a drive shaft 24 that is rotationally driven by a motor.
Then, the 112 synchronized gear 26', which is integrally attached to the idler shaft 27, and the third Okaseki gear 28, which is integrally attached to the first eccentric roller drive shaft 3tK, mesh with each other and are rotationally driven. Tuning gear 26
The second eccentric roller drive shaft 31 is integrally attached to the second eccentric roller drive shaft 31, and the nine-four synchronized gear 29 is engaged with the second eccentric roller drive shaft 31 to drive the rotation.

FIG. 113 shows the internal structure of the vibrator 200 viewed from the side, and the drive shaft 24 is connected to the drive motor 32.
It is designed to be rotationally driven via a coupling 33. The left end 1 of this drive shaft 24! A third synchronized gear 28 meshes with the first synchronized gear 25 that is integrally provided with the IK, and an eccentric roller drive shaft 3o of the third synchronized gear 28K111 is integrally attached to the IK. Although I did not intend to do so, the second point mentioned above. The fourth synchronizing gear 26, 29, the idler shaft 27, and the second eccentric roller drive shaft 31 are similarly constructed. The middle portions of a first drive arm 34 and a second drive arm 35 are attached near both left and right ends of the first eccentric roller drive shaft 30, respectively. As can be seen in detail from FIG. 4, each of the first and second drive arms 34, 35 is provided with a first balance weight 341 and a second balance weight 35a, respectively, near the upper end K, and a second balance weight 341 and a second balance weight 35a are provided at the lower part thereof. 1 Eccentric roller shaft 3
B is attached. This first eccentric roller shaft 38
A first eccentric roller 40 is rotatably attached to the roller via a bearing 44. As shown in Figure 4, K, the second
Similarly, the third drive boom 36 is also connected to the eccentric roller drive shaft 31.
and a fourth drive arm 37 (not shown) are integrally attached, third and fourth balance weights 36 and 371 (not shown) are respectively formed at the upper end of this arm, and at the lower end thereof. is provided with a second eccentric roller shaft 39,
A second eccentric roller 41 is rotatably attached to this via a bearing. These first and second eccentric roller drive shafts 30 and 31 are provided concentrically therewith, respectively. Second guide cylinders 42 and 43 are provided, and the eccentric rollers 40 and 41 are eccentrically rotated on the cylindrical inner wall of each guide cylinder 42 and 43 so that they roll while not in rolling contact. .

The vibratory pile driver of the present invention, which is K11lfi as described above, is
Drive motor 32 drives drive shaft 24 . The *i drive arm 34.35 is rotationally driven via the III tuning gear 25, 113 tuning gear 2B and the second eccentric roller drive shaft 30, and further the driving shaft 24, the first tuning gear 2! S, second tuning gear 26%, fourth tuning gear 29, second eccentric roller drive shaft 3
1, the third and fourth drive arms 36.37 are rotationally driven, thereby causing the first eccentric roller 40 and the second eccentric roller 41 to move against the cylindrical inner wall of the first and second guide cylinders 42,43, respectively. The rollers rotate eccentrically while making contact with each other, generating vibrations. In this case, each eccentric roller +40. .

41 are adapted to rotate in opposite directions to each other (by the synchronizing gears 25, 26, 28, 29), and the fourth
As shown in the figure, the eccentric directions of the respective rollers 40, 41 are configured to be in opposite phases, and the vibrations generated by the eccentric rolling contact of the rollers 40, 41 are doubled.

In addition, since the eccentric rollers 40.41 rotate eccentrically while rolling and contacting the cylindrical inner wall portion formed by the guide cylinder 42.43, the load due to the centrifugal force generated from this is generated by the guide cylinder. Each of the eccentric drive shafts 30, 31 is adapted to be received by a cylindrical inner wall of
The life of the bearing is dramatically improved because there is no stone that requires particularly large power and medium strength, and for this reason, the rotation speed of the eccentric roller 40. The number can now be increased dramatically. In more detail.

The eccentric roller of the present invention and the cylindrical inner wall of the guide cylinder do not rotate while being supported by the drive shaft as in the conventional case, but the eccentric roller and roller are attached to the respective drive shafts. It is loosely supported via a bearing, and the power required to simply rotate it is tens to hundreds of kilograms.
W) The reaction force of i-lux depending on K is within several hundred C), and the life of the bearing does not become a problem, and its life can be dramatically extended. Further, the cylindrical inner wall portion formed by the guide cylinder only needs to receive the eccentric roller, which is extremely simple in structure, and there is no problem in terms of strong WIL and service life.

A vibratory pile driver showing another embodiment of the present invention shown in Figures 5 and 6 is a case where the outer diameter of each eccentric roller is increased in the pile driver shown in Figures 2 to 4 above. The other configurations are the same], and the operation and effect are the same.

As explained above, according to the present invention, the eccentric roller rolls eccentrically within the cylindrical inner wall portion formed by the pair of guide cylinders while being in contact with each other, thereby generating vibrations and driving the eccentric roller to rotate. The support bearing for the drive shaft only needs to have enough power to rotate the eccentric roller, which dramatically extends the life of the bearing.
The number of rotations can be increased, thereby increasing the amount of vibration and the wave number, so that vibration distribution due to vibration propagation can be dramatically reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the internal structure of a conventional vibrating pile driver, Fig. 2 is a side view of a vibrating pile driver showing an embodiment of the present invention, and Fig. 3 is the vibration of Fig. 1 above. Fig. 4 is a cross-sectional view showing the internal structure of the vibrating part of the vibrating pile driver shown in Fig. 4 A-Ali. FIG. 3 is a cross-sectional view taken along B-Bli [FIG. 3, FIG. FIG. 4 is a cross-sectional view corresponding to FIG. 3 and FIG. 4, respectively. 20.- Vibration unit, 21.. Chuck, 22.. Shock absorber, 23.. Wheel, 24.. Drive shaft, 25..
・First tuning gear, 26...Second tuning gear, 27...
Idler shaft, 2B...Third synchronized gear, 29...1
[4 synchronized gear, 30...first eccentric roller drive shaft, 3
1... Second eccentric roller drive shaft, 32... Drive roller -
ter, 34...first drive arm, 35...fa2 drive arm, 34 hatake...$11E 1/(5 weight, 35m...second balance weight %36...
Third drive arm, 37...Fourth drive arm, 38...
- First eccentric roller shaft, 39... Second eccentric roller shaft, 40... First eccentric roller, 41... Second eccentric roller, 42... First guide cylinder, 43...
Second guide cylinder, 44...bearing.

Claims (1)

[Scope of Claims] L: at least a pair of cylindrical inner wall portions; means for rolling the eccentric rollers provided in the inner wall part while the rollers are in contact with the inner wall in such a manner that the rotational directions are opposite to each other and the eccentric directions are in opposite phases to each other; A vibratory pile driver characterized by comprising a vibrating section.