JPH0714471Y2 - Center deviation prevention device for ground excavator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the field of excavation and relates to a center deviation prevention device for a ground excavator.

[0002]

2. Description of the Related Art The conventional excavation shaft of a ground excavator is supported on the ground so as to hold the center to some extent, but since it has no means for holding it in the soil, if the excavation shaft becomes long In many cases, the center of the excavation axis deviates in an unspecified direction as the length increases, and depending on the soil type, a large deviation in the center occurs, resulting in deformation and damage of the excavation axis, and other defects such as power loss and deterioration of construction accuracy. Was.

[0003]

In view of the above, the present invention has been made in view of the above problems.
Provided is a center deviation prevention device for a ground excavator that can support the axis of an excavation shaft in the soil.

[0004]

A center deviation preventing device for a ground excavator according to the present invention is a ground excavator for vertically propelling the ground by rotating an excavation shaft having an excavation blade as a tip head by a predetermined excavation mechanism. In, a required number of arms are uniformly fitted to the required position of the excavation shaft so as to be externally fitted and positioned, and a pin having a required diameter having a shaft center at the same diameter position as the excavation diameter of the excavation blade is attached to the arm. It is constructed vertically.

[0005]

The pin vertically provided at the tip of the arm is guided by the peripheral wall of the excavation hole, and the excavation shaft is rotatably guided by the axial center portion of the arm.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment. As shown in FIG. 1, a ground excavator has a predetermined excavation mechanism (not shown).
The excavation shaft 1 rotated by the
In the excavation axis 1 which is above the excavation blade 2 as required, the excavation axis 1
A boss 4 whose upper and lower sides are positioned by a ring 3 is rotatably fitted onto the boss 4, and an arm 5 is integrally projected on the boss 4 in a cross shape as shown in FIG. Pin 6 with a conical shape with the axis centered at the same diameter as
The unit is installed vertically and is used. In this way the drilling shaft 1
A boss 4 that is fitted onto the boss 4, an arm 5 that evenly and integrally projects to the boss 4, a pin 6 that is vertically installed at a required position at the tip of the arm 5, and a ring that restrains the boss 4 from above and below on the excavation shaft 1. Center deviation prevention device a in ground excavator consisting of 3
(Hereinafter, this device is referred to as a device for simplification.) Is rotatably mounted on the excavation shaft 1 at approximately 5 m intervals depending on the excavation depth. Therefore, the ground is the excavation wing 2
When the excavation shaft 1 is excavated by
The excavation shaft 1 tends to be displaced due to the degree of excavation resistance applied to the excavation blade 2, but the pins 6 are evenly arranged at the same diameter position as the excavation diameter, so the outer surface of each pin is not excavated. Since the arms 5 are in contact with each other, each arm 5 does not rotate and supports the excavation shaft 1 via the arms so as not to be displaced from the center. As described above, since the ground can be excavated without the center being displaced, the excavation accuracy is improved, the excavation shaft 1 is not deformed and damaged, and the excavation shaft 1 is not excessively excavated when the excavation shaft 1 is pulled up, thereby eliminating power loss. It On the other hand, from the viewpoint of using a drill hole, it has the advantages of improving the construction accuracy such as pile driving and cement milk pouring, and also eliminating the loss of construction power.

[0007]

[Effects of the Invention] As described above, according to the present invention, in addition to contributing to longer life of the excavating shaft and labor saving of the excavating power, it contributes to the improvement of the construction accuracy during the construction and the labor saving of the construction power. Is a great deal.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a state in which the device a is mounted and excavation is performed.

FIG. 2 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Excavation Axis 2 Excavation Wing 3 Ring 4 Boss 5 Arm 6 Pin

Claims (1)

[Scope of utility model registration request] 1. A ground excavator for vertically excavating and propelling the ground by rotating an excavation shaft having an excavation blade as a tip head by a predetermined excavation mechanism, and rotating an arm extending at a required number evenly at a required position of the excavation shaft. A center deviation prevention device for a ground excavator, which is movably fitted and positioned, and vertically provided with a pin having a required diameter having an axis at the same diameter position as the excavation diameter of the excavation blade with respect to the arm.