JP4349538B2 - Steel cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steel material cutting device.
[0002]
[Prior art]
When cutting and removing an obstructing steel material buried in water or in the soil, if possible, a diver after the dredging dive into the water to perform cutting / removal work, pulling / removing work with a vibro hammer, or a fully swiveling donut It was forcibly cut and removed by auger.
[0003]
However, the conventional method has the following problems.
(1) Cutting steel materials deep in the soil requires large facilities and costs. Since there are many underwater work by divers, work efficiency is bad and there is also a problem in safety.
{Circle around (2)} In the pulling / removing operation with the vibro hammer, if the steel material to be pulled out is, for example, a steel sheet pile, the joint joint is corroded and the pulling / removing operation becomes impossible.
[0004]
[Problems to be solved by the invention]
In order to solve the above-described problems, an object of the present invention is to provide an efficient and safe steel material cutting device that cuts a steel material deep in water in a longitudinal direction.
[0005]
[Means for Solving the Problems]
The present invention is an apparatus for cutting steel material buried in water or soil, a cutting machine provided with an abrasive jet cutter, an abrasive jet cutter driving device, and a drive shaft for driving the cutting machine in a vertical direction; A steel pipe cutting device characterized in that a protective pipe for protecting a cutting machine and a drive shaft, and a ruler for driving the protective pipe are fixed to the outer periphery of the protective pipe.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Below, the embodiment of the present invention is described, referring to drawings about the case where the steel material buried in water or soil is a steel sheet pile.
[0007]
<A> Overall Configuration FIG. 1 is a cross-sectional view of a steel cutting apparatus according to the present invention, and FIG. 2 is a detailed cross-sectional view of a portion A in FIG.
The steel material cutting device includes a cutting machine 1 equipped with a known abrasive jet cutter, an abrasive jet cutter driving device 2, a drive shaft 3 for driving the abrasive jet cutter in the longitudinal direction, and a cutting machine. 1 and a protection pipe 4 that protects the drive shaft 3, and a cutting device in which a ruler 5 for driving the protection pipe 4 is fixed to the outer periphery of the protection pipe 4.
[0008]
<B> Cutting Machine, Abrasive Jet Cutter Drive Device The cutting machine 1 is a cutting machine 1 equipped with a known abrasive jet cutter, and operates the abrasive jet cutter drive device 2 to remove the abrasive. The jet cutter is moved in the vertical direction, and the nozzle 1a for jetting high-pressure water is jetted onto the object to be cut and cut.
[0009]
<C> Protective pipe The protective pipe 4 has a function of housing and protecting the cutting machine 1 and the drive shaft 3 in its internal space using, for example, a steel pipe pipe, and a function of installing the cutting machine 1 at a cutting position. It is what you have.
The inner diameter of the protective pipe 4 is set to a size that allows the whole of the cutting machine 1 including the tip of the nozzle 1a to be accommodated in the protective pipe 4 with a slight margin.
Since the protective pipe 4 is placed in the soil, the end of the protective pipe 4 has an acute angle.
[0010]
<D> The rule 5 is for placing the protective pipe 4 as close to the steel sheet pile 6 as possible.
The ruler 5 is fixed by protruding a bowl-shaped plate on the outer periphery of the protective pipe 4.
[0011]
[Action]
The operation of the present invention will be described below.
[0012]
<I> Placing the protective pipe The protective pipe 4 is placed in close contact with the steel sheet pile 6 buried in the water or in the soil.
Any conventional method may be employed as the placing method.
Since a flange-like ruler 5 is projected and fixed on the outer periphery of the protection pipe 4 at a predetermined depth, the protection pipe 4 is driven until the ruler 5 comes into contact with the top end of the steel sheet pile 6.
[0013]
<B> Operation of the abrasive jet cutter driving device The abrasive jet cutter driving device 2 is operated to move the drive shaft 3 up and down, and the jet cutter is moved in the vertical direction, and the high pressure water is supplied from the nozzle 1a of the cutting machine 1. And the protective pipe 4 and the steel sheet pile 6 are cut simultaneously.
[0014]
【The invention's effect】
Since the present invention has been described above, the following effects can be obtained.
<I> Since the cutting machine is configured to be housed in the protective pipe, it can be easily installed up to the cutting position of a steel sheet pile buried in water or in the soil.
<B> By measuring the top position and cutting position of steel sheet piles in advance, the subsequent work can be easily performed on land or on board.
<C> Since a hook-like ruler is projected and fixed on the outer periphery of the protection pipe at a predetermined depth, it becomes a ruler for placing the protection pipe and can be easily operated.
<D> Since preparation work and equipment for cutting steel sheet piles are simple, construction costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a steel cutting apparatus according to the present invention.
FIG. 2 is a detailed cross-sectional view of the portion of FIG. 1A.

Claims (1)

A device for cutting steel material buried in water or soil,
A cutting machine equipped with an abrasive jet cutter,
An abrasive jet cutter drive,
A drive shaft that drives the cutting machine longitudinally;
A protective pipe protecting the cutting machine and the drive shaft;
A ruler for placing a protective pipe is fixed to the outer periphery of the protective pipe.
Steel cutting device.

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