JPH0319325B2 - - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to a method and an apparatus for cutting steel pipe sheet piles used in underwater quay structures, bridge pier erection work, reclamation work, etc. after completion of the construction. .

``Prior Art'' Conventionally, as a device for cutting steel pipe sheet piles used for underwater quay structures, bridge pier erection work, reclamation work, etc. after completion of the construction, for example, push-cut disk cutters or grindstone cutters are suitable examples. It is known that rotating cutters are used alone or in combination.

For example, a cutting device capable of cutting both the steel pipe body (hereinafter referred to as the main body pipe part) and the joint (hereinafter referred to as the joint pipe part) of a steel pipe sheet pile using a grindstone cutter equipped with a revolution and rotation drive device was published in Japanese Patent Publication No. 50-32139. It is disclosed in the publication No.

Further, a cutting device incorporating a disk cutter and a grindstone cutter so as to cut a main body pipe portion with a disk cutter and then cut a joint pipe portion with a grindstone cutter is disclosed in, for example, Japanese Patent Publication No. 61-33933.

Further, a cutting device for cutting a main body pipe portion and a joint pipe portion using high pressure fluid using a water jet nozzle is disclosed in, for example, Japanese Patent Laid-Open No. 61-87020.

Furthermore, a cutting device that cuts the main body pipe portion with a disk-shaped cutter and then cuts the joint pipe portion using high-pressure fluid using a water jet nozzle is disclosed in, for example, JP-A-61.
-Disclosed in Publication No. 86122.

"Problems to be Solved by the Invention" The above-mentioned Japanese Patent Publication No. 50-32139 and Japanese Patent Publication No. 61, which involve cutting the main body pipe section or the joint pipe section with a whetstone cutter.
In the technology disclosed in Publication No. 33933, the cutter blade itself is inserted into the main body pipe or joint pipe, and just before the cutting is completed, the cutter blade is stuck due to residual stress or the weight of the pipe. In order to become
There was a problem that the cutter was easily damaged, resulting in poor cutting costs and workability.

Furthermore, in the techniques of JP-A No. 61-87020 and JP-A-61-86122, the joint pipe section is cut from the inner surface of the main body pipe section using high-pressure fluid. As the distance from the nozzle mouth increases, cutting ability decreases and complete cutting becomes difficult.
Furthermore, cutting took a considerable amount of time, which caused problems in terms of cutting costs.

It is also an object of the present invention to solve such conventional problems.

"Means for Solving the Problems" The first aspect of the present invention is to cut the joint pipe part of the steel pipe sheet pile with a grindstone cutter inserted into the main pipe part of the steel pipe sheet pile to be cut, or after cutting the joint pipe part of the steel pipe sheet pile. This method of cutting a steel pipe sheet pile is characterized in that, in parallel, a main body tube portion of the steel pipe sheet pile is cut using high-pressure fluid from a water jet nozzle.

Further, the second invention provides a grinding wheel cutter portion that is movable forward and backward in a direction perpendicular to the rotating shaft at the lower end of the rotating shaft, and the rotating shaft is rotatably loosely fitted into the cylindrical casing, and the rotating shaft is rotatably fitted into the casing. In a steel pipe sheet pile cutting device in which the casing is held on the inner wall of the main body tube part of the steel pipe sheet pile by a holding means provided on the outer peripheral part, a nozzle holder is provided that can move forward and backward in a direction perpendicular to the turning shaft, and the above-mentioned Attach a water jet nozzle to the tip of the nozzle holder so that the height of the nozzle opening is at the same height as the grindstone cutter of the grindstone cutter part,
The apparatus for cutting steel pipe sheet piles is characterized in that the water jet nozzle is provided with a fluid supply means for supplying fluid from outside the apparatus.

``Operation'' It takes a considerable amount of time to cut the joint pipe from the inner wall of the main body pipe using the high-pressure fluid from the water jet nozzle, but it is possible to cut the joint pipe with a whetstone cutter while the main pipe is still connected. Cutting can be done in a short time without any jamming, and even when the joint pipe section is cut, the material to be cut will not fall or collapse, and the grindstone cutter will not be damaged.

If the joint pipe section is cut with a grindstone cutter, or at the same time, the main body pipe section is cut with high-pressure fluid from a water jet nozzle, efficient cutting can be done with one device without any jamming problems.

It should be noted that if a disc cutter is used to cut the main body tube, it can be cut in a shorter time, but in the present invention, the joint tube has already been cut when cutting the main body tube, so the remaining body tube can be cut in a shorter time. It has low rigidity and cannot be cut properly.

On the other hand, if the high-pressure fluid from the water jet nozzle is used, the main body pipe can be cut smoothly without any problems.

"Example" Below, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a longitudinal cross-sectional view of an apparatus showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a sectional view taken along the line B-B in FIG. 2.

In the drawings, 1a is a main body pipe section of a steel pipe sheet pile 1 erected in water, and 1b is a joint pipe section provided externally thereto.

The casing 3 of the cutting device main body 2 inserted into the inner cavity of the main body tube portion 1a is fixed to the inner wall of the main body tube portion 1a by the holding means 4.

A rotatable whetstone cutter part 5 is provided in the lower part of the casing 3, and a whetstone cutter 6 that cuts by abutting against the inner wall of the main body tube part 1a is provided thereon in a freely expandable and retractable manner.

A nozzle holder 7 is vertically provided from the whetstone cutter part 5 on the same plane as the whetstone cutter part 5 and in a direction perpendicular to the direction in which the whetstone cutter 6 abuts on the inner wall of the main body tube part 1a.

At the upper part of the casing 3, a turning drive device 8 for the grindstone cutter portion 5 and the nozzle holder 7 is provided.

A water jet nozzle 9 is attached to the nozzle holder 7.
, a fluid supply means 10 for supplying fluid from the outside.
is connected.

In the above configuration, the casing 3 of the cutting device main body 2 is formed into a cylindrical shape, and an appropriate hanger 11 is provided at the upper part of the casing 3 for suspending or lifting the cutting device main body 2 within the main body tube portion 1a. .

In the center of the casing 3, a swing shaft 12 is loosely fitted into a shaft receiver (not shown).

The holding means 4 has clamp seats 13 that are movable in the radial direction of the casing 3 at a plurality of locations in the circumferential direction and the vertical direction of the casing 3.

In this embodiment, each clamp seat 13 is driven by a hydraulic cylinder 14, and is arranged at four locations in the circumferential direction above and below the casing 3.

The grindstone cutter portion 5 includes a base plate 15 fixed to the lower end of the rotating shaft 12, and a slide plate 16 fitted into the base plate 15.
, a grindstone cutter 6 placed on the end of a slide plate 16, and a drive motor 17.

In order to make the slide plate 16 slidable, a hydraulic cylinder 19 is connected to the end of the slide plate 16 by a bracket 20, which is connected to a bracket 18 provided at the end in the base plate 15.

Further, the grindstone cutter 6 is connected to a drive motor 17 and provided at the open end of the slide plate 16.

The nozzle holder 7 has a fixed box 21 fixed to the lower surface of the base plate 15 at an angle of 90 degrees to the cutting direction of the cutting means 5, and a slide box 22 in which the water jet nozzle 9 is provided at the opening of the fixed box 21. is inserted.

A hydraulic cylinder 23 is provided to make the slide box 22 slidable.

If a roller 24 is provided at the tip of the slide box 22 on the inner wall side of the main body tube portion 1a, deformation and unevenness in the circumferential direction of the main body tube portion 1a can be absorbed in a good manner.
The method is not limited to this method.

Although one water jet nozzle is mounted on the nozzle holder 7 in this embodiment, a nozzle holder having a water jet nozzle in the opposite direction may be provided, or more may be provided depending on the number of water jet nozzles. Any number of them can be provided.

The swing drive device 8 is composed of a motor 25, a pinion 26, and a gear 27, and is connected to the swing shaft 1.
2 is designed to rotate.

Note that 28 is a turning position detector connected to the output shaft 29 of the motor 25.

The water jet nozzle 9 consists of a nozzle opening 30 and a nozzle body 31, and is attached to the top of the tip of the slide box 22. By moving the slide box 22 back and forth in the direction of the inner wall of the main body tube portion 1a, the inner wall and the nozzle opening are separated. 30 can be set at a predetermined distance.

Further, the height position of the nozzle opening 30 is adjusted in advance so that it is at the same height as the grindstone cutter 6 of the grindstone cutter part 5, and the water jet nozzle 9 is attached to the nozzle holder 7.

The fluid supply means 10 is composed of two tubes, and is connected to the nozzle body 31 from the main body pipe portion 1a through the inside of the casing 3.

Two types of tubes are used: one for high-pressure water and one for supplying abrasive material.

Note that when inserting the cutting device main body 2 into the main body tube portion 1a, compressed air is supplied to the abrasive material supply tube via an abrasive material supply device (not shown), and water enters from the nozzle port 30. This is a mechanism to prevent the inside of the nozzle body 31 from becoming damp.

It is also an effective method to cover the nozzle port 30 with a water-resistant cover to prevent moisture inside the water jet nozzle 9, and to open the nozzle port 30 by jetting high-pressure fluid.

When cutting steel pipe sheet piles using the cutting device configured as described above, first, the cutting device main body 2, which is suspended by hanging a wire or the like on the hanging handle 11, is
When the whetstone cutter 6 is gradually inserted from the upper end of a and descended to the intended cutting position, each clamp seat 13 constituting the holding means 4 is pushed out by the hydraulic cylinder 14 and pressed against the inner wall of the main body tube part 1a. As a result, the cutting device main body 2 is fixed to the inner wall of the main body tube portion 1a and maintained in that state until the cutting operation is completed.

Next, the height of the turning shaft 12 is adjusted and fixed by an appropriate method, the grindstone cutter 6 is rotated, and the slide plate 16 is moved by the operation of the hydraulic cylinder 19.
is pushed out to the inner wall side of the main body tube section 1a, the grindstone cutter 6 at the tip comes close to the inner wall of the main body tube section 1a, the main body tube section 1a is then cut, and then the joint tube section 1b is cut.
is disconnected.

In addition, in order to perform cutting work accurately, it is preferable to adjust the turning shaft 12 using the turning position detector 28.

Once the center of one joint pipe portion 1b has been cut, the grindstone cutter 6 is moved backward, the turning shaft 12 is rotated 180 degrees, and the grindstone cutter 6 is advanced to cut the other joint pipe portion 1b to its center. Cut up to.

The slide plate 16 is returned to the base plate 15, and the rotation of the grindstone cutter 6 is stopped.

The grindstone cutter 6 is superior in cutting cost and work efficiency compared to the water jet nozzle 9 described later.
2 by 90 degrees, and use the whetstone cutter 6 to cut the main body tube part 1a.
After cutting a part of the main body pipe part 1b, the other joint pipe part 1b is cut, and then the turning shaft 12 is rotated 90 degrees in the same rotation direction as described above, and the other part of the main body pipe part 1a is cut with the grindstone cutter 6. It is advantageous to cut it.

After cutting a part of the joint pipe part 1b and the main body pipe part 1a as described above and retracting the grindstone cutter 6, the slide box 2 is moved by the operation of the hydraulic cylinder 23.
2 is pushed out to the inner wall side of the main body tube portion 1a, and the nozzle port 30 of the water jet nozzle 9 is pushed out to the inner wall side of the main body tube portion 1a.
Close to the inner wall, high-pressure water and abrasive material are supplied to the nozzle body 31 through the supply means 10 while rotating the rotating shaft 12, and the mixed liquid is directed from the nozzle opening 30 toward the inner wall of the main body tube portion 1a. The main body tube portion 1a that was not cut by the grindstone cutter 6 is cut in the circumferential direction by being sprayed.

Note that the cutting start position with the water jet nozzle is usually determined by the cutting conditions of the grindstone cutter 6 and the diameter of the grindstone.

Further, it goes without saying that there is no need to adjust the height position of the nozzle port 30 when cutting the main body tube portion 1a.

The high-pressure water and abrasive material are fed under pressure to the nozzle body 31 via the supply means 10 by a pressure intensifier (not shown) provided on the ground.

When the cutting of the main body tube portion 1a is completed, the supply of fluid is stopped, the slide box 22 is returned to its original position, and all operations are returned to their original state.

In the embodiment described above, high-pressure water and abrasive material were used as the fluids supplied to the nozzle body 31, but it is also possible to use only high-pressure water or any other fluid, for example.

Next, another embodiment of the steel pipe sheet pile cutting device of the present invention will be described based on the drawings.

FIG. 4 is a longitudinal sectional view of the grindstone cutter portion 5 and the nozzle holder 7 in a state where the cutting device is set in the main body tube portion 1a.

In the drawings, reference numeral 32 denotes a rotation drive device disposed on the lower surface of the base plate 15 fixed to the lower end of the swing shaft 12, and is operated by a hydraulic motor (not shown).

A nozzle port 3 is provided at the bottom of the rotation drive device 32.
The nozzle holder 7 is vertically arranged so that the height of the nozzle holder 7 is adjusted in advance to be the same height as the grindstone cutter 6.

Note that the holding means 4 and other parts other than those described above are the same as those in the previously described embodiments, so explanations thereof will be omitted.

Next, a method of cutting the steel pipe sheet pile 1 using the above-mentioned device will be explained.

First, the cutting device main body 2 is inserted from the upper end of the main body tube portion 1a, and when the grindstone cutter 21 is lowered to the intended cutting position, the cutting device main body 2 is fixed to the inner wall of the main body tube portion 1a.

Next, the height of the turning shaft 12 is adjusted and fixed, and the whetstone cutter 6 is rotated to start cutting the joint pipe portion 1b, and at the same time, the nozzle opening 30 of the water jet nozzle 9 is The main body pipe section 1a is brought close to the inner wall, and while operating the rotary drive device 32, high-pressure fluid is injected from the nozzle port 30 to start cutting from any position of the main body pipe section 1a in the direction opposite to the cutting position of the grindstone cutter 6. do.

In order to ensure the necessary rigidity so that the main body tube part 1a does not collapse, an uncut portion of the main body tube part 1a is left, the nozzle opening 30 is rotated 180 degrees, a similar cutting operation is performed, and the grinding wheel cutter 6 is used to perform the same cutting operation. Joint pipe part 1b
After the cutting is completed, high-pressure fluid is again injected from the nozzle port 30 to cut the uncut portion of the main body tube portion 1a, and the work is completed.

"Effects of the Invention" As described above, according to the steel pipe sheet pile cutting method and apparatus of the present invention, first, a part of the joint pipe part and the main body pipe part are cut with a grindstone cutter, and then the remaining main body pipe part is cut. The waterjet nozzle can cut efficiently, eliminating jamming problems and inefficient cutting of joint pipes.

In addition, in the device of the present invention, the height of the grindstone cutter and the nozzle opening are adjusted to the same position, so after cutting the joint pipe part of the steel pipe sheet pile with the grindstone cutter, the cutting can be switched to the main body pipe part cutting with the water jet nozzle. Since there is no need to adjust the height of the nozzle opening when cutting, workability is improved and cutting time can be shortened.

Further, by providing a rotational drive device for rotating the nozzle holder, the main tube portion and the joint tube portion can be smoothly cut in parallel, and the cutting time can be significantly shortened.

Furthermore, since the present invention can be equipped with a grindstone cutter with a large diameter close to the inner diameter of the main body tube, even if the cutter is worn out due to cutting the joint tube from the inner wall of the main body tube, there is no problem at all with cutting work. .

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a cutting device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG.
Figure 3 is a sectional view taken along line B-B in Figure 2, and Figure 4 is
It is a longitudinal cross-sectional view of a grindstone cutter part and a nozzle holder of a cutting device showing another example of the present invention. 1... Steel pipe sheet pile, 2... Cutting device main body, 3...
Casing, 4... Holding means, 5... Grindstone cutter portion, 6... Grindstone cutter, 7... Nozzle holder, 8
... Rotating drive device, 9 ... Water jet nozzle, 10 ... Fluid supply means.

Claims (1)

[Scope of Claims] 1. After or in parallel with cutting the joint pipe part of the steel pipe sheet pile by a grindstone cutter inserted into the main body pipe part of the steel pipe sheet pile to be cut, high-pressure fluid from the water jet nozzle is cut. 1. A method for cutting a steel pipe sheet pile, which comprises cutting the main tube portion of the steel pipe sheet pile using a method. 2. A whetstone cutter part that is movable forward and backward in a direction perpendicular to the rotating shaft is provided at the lower end of the rotating shaft, the rotating shaft is rotatably fitted loosely into a cylindrical casing, and a holding means is provided on the outer periphery of the casing. In the steel pipe sheet pile cutting apparatus in which the casing is held on the inner wall of the main body of the steel pipe sheet pile, a nozzle holder is provided which can move forward and backward in a direction perpendicular to the rotating shaft, and a water pipe is attached to the tip of the nozzle holder. The jet nozzle is installed so that the height of the nozzle opening is at the same height as the grindstone cutter of the grindstone cutter part, and a fluid supply means is provided for supplying fluid from outside the device to the water jet nozzle. A steel pipe sheet pile cutting device featuring: