Road structure – process – or apparatus – Apparatus – Material distribution means
Patent
1998-12-10
2000-10-17
Lisehora, James A.
Road structure, process, or apparatus
Apparatus
Material distribution means
404117, 180 946, 305120, E02D 3074
Patent
active
061321338
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a crawler type vibratory compacting machine which can compact the ground, from a surface layer to a deep layer, with high efficiency.
BACKGROUND OF THE INVENTION
Generally, self-propelled vibratory compacting machines are roughly classified into roller type machines and crawler type machines (with tracks or crawlers). Most of the roller type machines are designed for dedicated applications, and include vibrators for generating vertical vibrations (hereinafter called "vertical vibrators"). With the roller type vibratory compacting machine, its roller has a substantially line contact with the surface of the ground, and applies a large surface pressure per unit area of the ground. Therefore, such a machine suffers from the following problems. First of all, when compacting soft ground, the large surface pressure per unit area tends to distort the surface layer of the soft ground, which means that the surface layer cannot be compacted. Secondly, when compacting hard ground, a surface layer of such hard ground can be compacted, but there can be a large disparity between the rigidity of the surface layer and that of a deep layer, so that the deep layer cannot be completely compacted. Basically, the deep layer can be compacted by increasing the weight and the vertical vibrations of the compacting machine. However, if such measures are taken and great pressure per unit area, larger than the pressure per unit area that the particular type of ground can endure, is applied, the surface layer of the hard ground is not compacted, as is the case with soft ground. In other words, the hard ground can be compacted to a depth of approximately 30 cm at most.
Japanese Patent Publication No. Hei 5-41761 discloses a "Roller type vibratory compacting machine having a large eccentric weight and a small eccentric weight that rotate at low and high speeds, respectively", and pays particular attention to the fact that "the machine can compact a deep layer of the ground by rotating the large eccentric weight of a vertical vibrator at a low speed and with large amplitude, while the surface layer can be compacted by rotating the small weight at a high speed and with small amplitude".
Japanese Utility Model Laid-open No. Hei 1-119407 discloses a "Roller type vibratory compacting machine", and pays particular attention to the fact that "when a roller is horizontally vibrated, moisture and air is discharged from the ground, which enhances compacting of the ground," and that "horizontal vibrations are less hazardous to the environment than vertical vibrations." In the Utility Model, a horizontal vibrator is employed in place of a vertical vibrator.
Contrary to the roller type vibratory compacting machine, a crawler type vibratory compacting machine comes into substantial surface contact with the ground. Although the surface pressure per unit area is small, such a machine can apply the pressure to a wide area of the ground surface. In other words, the disparity between the pressure applied to a unit area of the surface layer of the ground and the pressure applied to a unit area of the deep layer is much smaller than that of the roller type vibratory compacting machine. Further, the surface pressure is applied to the ground for a longer period of time during forward and backward movements of the crawler type vibratory compacting machine, compared with the roller type vibratory compacting machine, i.e. the surface pressure lasts far longer than in the roller type machine. Therefore, the crawler type machine can carry out a uniform compacting of the ground from the surface layer to the deep layer. The crawler type machine is free from the first and second problems, and is advantageous in that it can compact a deep layer of the ground (approximately 1 meter deep). The following proposals have been made in publications related to crawler type vibratory compacting machines.
(1) Japanese Patent Laid-open No. Sho 58-135231 discloses a "Crawler type shovel having vertical vibrators attached
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Inoue Hiroyuki
Muro Tatsuro
Ohashi Tatsuo
Yoshida Kazuhiro
Komatsu Ltd.
Lisehora James A.
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