JPS6033154Y2 - Guide device for excavation shaft in excavator - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a guide device for an excavation shaft in an excavator that constructs, for example, a soil-cement wall underground.

Conventionally, in an excavator that excavates from the ground to a predetermined depth while lowering the excavation shaft using a leader mast as a guide, the excavation shaft is long, so the excavation shaft bends during excavation.

For this reason, the vertical accuracy of the excavated hole deteriorated, and when ready-made piles were successively inserted into the excavated hole, problems such as incomplete connection of the circumferential surfaces of the piles occurred.

This idea prevents the excavation shaft from bending during excavation,
The purpose is to eliminate the above-mentioned drawbacks.

This idea provides a slide member that moves up and down on the leader mast, and a guide member that supports the central part between the top and bottom of the excavation shaft is attached to this slide member, and when the slide member reaches near the ground, the guide member moves from the slide member to Provided is a guide device for an excavation shaft in an excavator that can be removed.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

- In the figure, A is an excavator, and this excavator A has a traveling truck 1, a leader mast 2 supported by the traveling truck 1, a slider 3 that moves up and down using the leader mast 2 as a guide, and an upper end of the slider 3. An excavation shaft 5 that supports the excavation shaft 5 and is driven by the motor 4.
It is composed of.

In the illustrated case, the excavation shaft 5 includes a shaft member 7 having a head 6 at the lower end, screws 8 provided along the entire length or at required intervals from the lower end to the upper end of the outer periphery of the shaft member 7, and the excavation shaft. A passage 9 is provided in the axial center of the shaft member 7 so that a solidifying liquid such as cement milk can be supplied from the upper end of the shaft member 5 toward the head 6.

Furthermore, the leader mast 2 is provided with a slide member 10 that is positioned below the slider 3 and moves up and down.

The above-mentioned slide member 10 has rails 11 provided on both sides of the leader mast 2 similarly to the slider 3.
1 includes holding pieces 12 protruding from both sides of the slide member 10;
The wire 13, whose tip end is connected to the slide member 10, is wound and unwound to be raised and lowered.

Furthermore, a cylindrical body 14 is provided in the center between the upper and lower ends of the excavation shaft 5, and is fitted onto the shaft member 7 so that the shaft member 7 can rotate freely.

The above-mentioned cylindrical body 14 is a fastener 1 consisting of a bolt and a nut.
Two overlapping plate-like bodies 16.16 fixed by 5,
This plate-shaped body 16.16 is configured with an arc-shaped recessed portion 17 provided so that the opposing surface thereof is recessed.

Further, the end of an arm 19 is rotatably supported at the tip of the slide member 10 via a pin 18, and a cylindrical body 14 is detachably connected to the tip of the arm 19 via a pin 20. There is.

The pin 20 described above has a through hole that matches each other in the piece projecting from the cylindrical body 14 and the tip of the arm, and the pin 20 is inserted into the through hole.

In the figure, 21 is a wire for raising and lowering the slider 3, and 22 is a cylindrical guide member provided at the lower end of the leader mast 2 to guide the excavation shaft 5.

The excavator according to the second invention has the above-described configuration, and the excavation method will be explained next. After the excavation shaft 5 is pushed into a predetermined position on the ground, each excavation shaft 5 is driven by the operation of the motor 4. At the same time, by winding back the wire 21 and lowering the excavation shaft 5 together with the slider 3, excavation is carried out from the ground into the ground.

At this time, the wire 13 is loosened and the slide member 10 is lowered together with the excavation shaft 5, so 1. Until the slide member 10 reaches the lower end of the leader mast 2, the excavation shaft 5 is connected to the slide member 10 via the arm 19 and the cylindrical body 14.
support.

When the cylindrical body 14 reaches near the ground as shown in FIG. 5, the pin 20 is pulled out, the tip of the arm 19 is removed from the cylindrical body 14, and the excavation shaft 5 is lowered to continue excavation.

During the above-mentioned excavation, a liquid for consolidation is injected from the passage 9 of the shaft member 7, and this liquid and the excavated earth and sand are stirred and kneaded by the screw 8, and the inside of the excavated hole is turned into soil cement.

However, as shown in Fig. 7, the pile C was inserted into the drilled hole B.
Insert.

Note that when the excavation shaft 5 is pulled out, the tip of the arm 19 is connected to the cylindrical body 14 via the pin 20, and the slide member 10 is pulled up together with the excavation shaft 5.

As described above, according to the guide device for the excavation shaft in an excavator according to this invention, the leader mast is provided with a slide member that descends together with the excavation shaft, and the upper and lower ends of the excavation shaft are attached to the tip of the arm connected from the slide member. Since the cylindrical body provided in the center of the space allows the excavation shaft to rotate freely, it is detachable, so that the intermediate part of the excavation shaft is bent while the excavation shaft and the slide member are lowered as the excavation shaft is lowered. You can eliminate the inconvenience.

Therefore, it is possible to drill holes with high vertical accuracy.

Further, since the connection between the cylindrical body and the tip of the arm can be released, it is possible to continue digging with the digging shaft after the slide member reaches the lower end of the leader mast.

[Brief explanation of the drawing]

Fig. 1 is a side view of the excavator according to this invention, Fig. 2 is a cross-sectional enlarged plan view showing the main parts of the same, Fig. 3 is a side view of the same,
FIG. 4 is a front view of the same, FIG. 5 is a side view showing the state of excavation, FIG. 6 is an enlarged side view showing the main parts of the same, and FIG. 7 is a plan view of the hole being drilled. A...Excavator, 1...5...Traveling trolley, 2
...Leader mast, 3...Slider, 4
...Motor, 5...Drilling shaft, 6...
...Head, 7...Shaft member, End...Screw, 9...Passage, 10...Slide member, 11... Rail, 12...
Holding piece, 13...Wire, 14...
Cylindrical body, 15... Fastener, 16... Plate-shaped body, 17... Recessed part, 18... Pin,
19... Arm, 20... Pin.

Claims (1)

[Scope of utility model registration request] In an excavator in which a leader mast of a traveling truck is provided with an excavation shaft that moves up and down along the leader mast, the leader mast is provided with a slide member that moves up and down, and the excavation shaft is free in the center between the upper and lower ends of the excavation shaft. A guide device for an excavation shaft in an excavator, in which a rotating cylindrical body is provided, and the cylindrical body is detachably attached to the tip of an arm connected to a slide member.