JPS6119599A - Underwater cutting method for steel piles, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for underwater cutting of objects to be cut, such as steel piles or steel sheet piles driven into riverbeds or the like.

[Conventional technology]

2. Description of the Related Art It has been known to cut an object using an abrasive jet in which an abrasive is mixed into a high-pressure jet. This method of cutting by spraying an abrasive blue jet onto the object to be cut has been used for cutting steel piles and the like on the ground, but has never been used for cutting underwater.

[Problem that the invention seeks to solve]

When attempting to automatically cut steel piles, etc. underwater using an abrasive pull jet, it is difficult to confirm whether the cutting point underwater is being cut correctly or not, and the abrasive pull jet For reasons such as the difficulty of automatically moving the nozzle underwater to the cutting location of steel piles, etc., an automatic cutting method using an ablage pull jet is adopted for underwater cutting of steel piles, etc. was not considered.

In view of the difficulty of underwater cutting, the present invention makes it possible to easily adopt the cutting method using an abrasion pull jet, which was conventionally used for cutting steel piles, etc. on land, to cut steel piles, etc. underwater. The purpose of this invention is to provide an underwater cutting method that allows accurate cutting.

[Means for solving problems]

The present invention has a cart that can move along the entire circumference of an object to be cut, such as a steel pile, a steel sheet pile, etc., that protrudes above the water surface,
A nozzle is provided at the tip of the pipe led into the water through the cart, and the nozzle is supported by a frame that can move around the circumference of the object to be cut and maintains a distance between the nozzle and the object to be cut, and the cart is moved. When cutting, the nozzle is moved through the pipe to cut along the movement of the cart, so that the cut point underwater can be seen from the position of the cart above the water surface.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show an embodiment of the present invention applied to the cutting of steel piles (1).
1), that is, the part protruding above the water surface, is equipped with a magnetic wheel (3) that rolls in the horizontal direction by adhering to the upper part of the magnetic wheel (3), and a travel motor (4) that drives the magnetic wheel (3) in rotation. The trolley (2) is placed on the floating body (5), and the trolley (2) and the floating body (5) can move together around the steel pile (1) by driving the travel motor (4). do it like this. On the other hand, at the cut point (6) of the steel pile (1) that is submerged in water, there is a nozzle (7) that sprays a water jet.
are held at a constant interval with respect to the steel pile (1), and the steel pile (1) is
) is detachably provided with a frame (8) whose circumference can be rotated.

This frame (8) is, for example, as shown in FIG.
A row 200 that can roll along the outer surface of the steel pile (1) on the inside
A frame body (9(L) (96) having a plurality of
It can be opened and closed centering around a connection mu that is rotatably connected with a hinge etc., and one frame body (9α) may have a nozzle (which can hold the force), or
The frame (8) may not be in the form of a link, but may be made to be able to move by magnetic force, for example, without separating from the steel pile (1) and following the circumference of the steel pile (1).

A pipe (L2+) whose one end is connected to the nozzle (7) is passed through the floating body (5), the lower end of the pipe (L2+) is connected to the nozzle (7), and the other end of the pipe (L2+) is connected to the trolley (
2) is supported by a jet water supply source (not shown), and a water jet mixed with an abrasive is passed through the pipe a and guided to a nozzle (7), and from the nozzle (7) the jet water is Water is sprayed towards the surface of the steel pile (1).

Now, when trying to cut the underwater cutting point (6) of the steel pile (1), the floating body (5) is positioned near the steel pile (1), and a nozzle (7) is attached to the underwater cutting point. Attach the frame (8) to the floating body (5) and the frame (8).
), adjust the length of pipe α2 according to the distance between
The pipe a is held by a trolley (2). Next, the trolley (2
) on the magnetic wheel (3) is attracted to the steel pile, and the pipe (
Water jet mixed with the polishing side is supplied to the nozzle (7) through the water pump, and the travel motor (4) is driven to rotate the magnet wheel (3). As a result, the bogie (2) and the θ floating body (5) begin to move in the horizontal direction, and the nozzle (7) sprays the steel pile (1) with an ablative jet boat to begin cutting.

The moving speed of the truck (2) is set at a low speed so that the abrasion jet that blows the steel pile (1) from the nozzle (power) can sufficiently cut the frame (8) and the nozzle through the pipe α. The nozzle (7) is made to follow the truck (2) and the floating body (5), and as the truck (2) goes around the steel pile (1) once, the nozzle (7) also goes around the steel pile (1) once. Profile cutting is performed.

When the steel pile (1) is cut underwater, the magnet wheel (3) is removed from the top of the pile to be removed, the frame (8) is also removed from the steel pile (1), and the cutting device itself is removed. At the time of this removal, since the cart (2) is placed on the floating body (5), the removal can be performed easily and safely.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, a rail may be provided over the entire circumference of the steel pile (1) above the water surface, and a trolley may be moved along the rail. It goes without saying that suction running by the magic wheel (3) may be substituted, and that various changes may be made without departing from the gist of the shrub invention.

〔Effect of the invention〕

As described above, according to the underwater cutting method for steel piles, etc. of the present invention, a cart is provided which can move horizontally along the part of the object to be cut that is located above the water surface, and a nozzle suspended from the cart is provided. , when the trolley moves around the object to be cut, it is moved to follow the object to be cut, and the abrasion jet from the nozzle is sprayed onto the object to perform underwater cutting, so underwater cutting can be easily performed. In addition to realizing automation,
Since it is a tracing cut, it is possible to easily determine the cut point underwater depending on the position of the cart above the water surface, and by moving the cart correctly in the horizontal direction, it is possible to easily cut in the horizontal direction correctly. It can have excellent effects.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is a plan view showing an example of a frame for holding a nozzle. (1) is a steel pile, (2) is a trolley, (3) is a magnetic car,
(4) is the traveling motor, (5) is the floating body, (6) is the cutting point, (force is the nozzle, (8) is the frame, and α is the pipe.

Claims (1)

[Claims] 1) A cart is moved along the surface of the object to be cut, such as a steel pile driven into a riverbed, etc., at a position above the water surface, and the nozzle suspended from the cart is moved along the underwater cut point. 1. An underwater cutting method for steel piles, etc., characterized in that a nozzle is moved to follow while moving a cart, and an object to be cut is cut underwater with an abrasive jet ejected from the nozzle.