JPH0111834Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention Industrial field of use In construction work, when excavating the ground while filling it with muddy water for underground construction of underground continuous walls, cast-in-place piles, etc., the clam shell type of excavator is used. Or guide the lifting and lowering of a cylindrical drilling type excavation bucket,
Or a vertical lifting bar (Kelly bar) that transmits rotational force.
This relates to a device that removes deposits such as muddy water and earth and sand that have adhered to the surface.

Prior Art As shown by the dotted line in Figure 3, several earthwork workers used a mop or the like to remove the debris.

Problems that the invention aims to solve: Workers came within the working range of heavy machinery (excavators), which caused safety problems.

In addition, if this work is not done, when the excavation bucket is pulled up to the ground, the kelly bar will be lifted even higher, and the muddy water adhering to it will scatter around the kelly bar, making the footing slippery and dangerous. This is particularly noticeable when gelling mud is used.

B. Structure of the invention Means for solving the problem A kelly bar 4, which ascends and descends along the guide post 1 of the excavator 3 as shown in FIG. The apparatus for removing deposits from a kelly bar of an excavator is characterized in that a frame body 5 having an inner circumference loosely circumscribing its cross section and having a specific gravity that floats in muddy water for excavation is loosely inserted into the frame body 5.

Function: When the Kelly bar is pulled up to discharge the earth and sand scraped by the excavation bucket to the ground, it slides against the inner slope of the frame floating in muddy water, so it removes gel-like muddy water, earth and sand, etc. that have adhered to the surface of the Kelly bar. is scraped off near the surface of the water.

When the excavation bucket is lifted above the ground, the frame also rests on it and leaves the surface of the muddy water, but when the excavation bucket enters the muddy water again, the frame floats on the water surface and returns to its original position.

Embodiment Figure 2 shows an embodiment of the present invention, in which hard styrofoam resin is cut into two square rods 5 each long and short.
A was created, which was arranged into a quadrilateral shape, and a square frame was formed by reinforcing bar pieces 6 passing through the axis of the short member and the end side of the long member.

C. Effects of the invention The working environment is improved because the deposits on the kelly bar can be removed without the need for humans to enter the working radius of the excavator.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how the device according to the present invention is used, and FIG. 2 is a perspective view showing an embodiment of the present invention. FIG. 3 is a cross-sectional view showing a condition in which an underground continuous wall is being excavated using a clam shell type excavation bucket. 1... Guide post, 2... Excavation bucket, 3
... Excavator, 4 ... Kelly bar, 5 ... Frame, 5
a... Square bar, 6... Piece of reinforcing bar.

Claims (1)

[Scope of utility model registration request] A Kelly bar 4 that ascends and descends along a guide post 1 of an excavator 3 and has an excavation bucket 2 attached to its lower end, has an inner circumference that loosely circumscribes its cross section, and has a specific gravity that allows it to float in muddy water for excavation. A device for removing deposits on a kelly bar of an excavator, characterized in that a body 5 is inserted loosely.