JPH0330649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for cutting steel pipe sheet piles driven into underwater ground or the like at a predetermined level.

[Prior Art and its Problems] Conventionally, the disc cutter method, the grindstone cutter method, the oxygen arc cutting method, and the like are known as typical underwater cutting methods for steel pipe sheet piles. However, among these methods, the disc cutter method and the grindstone cutter method can properly cut the main sheet pile (steel pipe part), but if you try to cut to the joint part, cutting will continue in the circumferential direction of the steel pipe sheet pile, which may cause damage to the cutter. . In addition, sealing material is filled inside the joint, but
When cutting the joint, the cutting resistance between the sealing material and the steel part (joint body) is different, which can also cause damage to the cutter. In addition, with the oxygen arc method, if concrete or rust adheres to the planned cutting position, there is a problem that the arc may break midway or become a hindrance to arc generation. It is necessary to remove it in advance, and cutting the joint portion as described above is difficult especially in relation to such deposits.

In all of these conventional methods, it is virtually difficult to cut the joint, and for this reason, it is recommended that the joint be pre-cut in some way based on the cutting position of the main sheet pile. Normal. However, due to problems with the ground, etc., the cutting position of the main sheet pile may deviate from the expected position, and in this case, the meaning of the above-mentioned pre-cut is lost, and the steel pipe sheet pile above the cutting position cannot be pulled out. .

The present invention has been made in view of the problems of the conventional method, and it is an object of the present invention to provide a device that can appropriately cut the joint portion as well as the sheet pile main pipe.

[Means and actions to solve the problem]

For this reason, the present invention employs a waterjet cutting method and has the following specific configuration. That is, the present invention has a main body and a plurality of abutting members that can move forward and backward at a plurality of locations in the circumferential direction and vertical direction of the main body, and each of the abutting members is brought into pressure contact with the inner wall of the steel pipe sheet pile so as to be able to come into contact with and separate from the inner wall of the steel pipe sheet pile. It has a retaining means to be held in place, has a female screw part at the upper end, has a water jet nozzle attachment part at the lower part, and is held in the center part of the main body through the upper part so that it can be horizontally rotated and slid in the vertical direction. a nozzle holder, a rotation drive device for the nozzle holder, a screw shaft that is vertically and rotatably held by a fixed part on the main body side and screwed into the female thread part from its lower end, and the screw A lift drive device for a nozzle holder, which is composed of a shaft rotation drive motor and a clutch provided between the output shaft of the motor and the screw shaft, and a steel pipe sheet pile movable in the radial direction is attached to the mounting part of the nozzle holder. Its basic feature is that it consists of a water jet nozzle and a fluid supply means for supplying fluid such as high pressure water to the water jet nozzle from outside the device.

Such a device is suspended from the upper end of the main sheet pile pipe, and is held at an arbitrary height within the main pipe by pressing each contact member serving as a holding means against the inner wall of the main pipe. The nozzle holder is moved up and down by an elevating drive device to adjust the cutting position of the water jet nozzle. During the cutting operation, the clutch of the lifting drive device is disengaged so that the screw shaft can rotate freely together with the nozzle holder, and high-pressure water, abrasive, etc. are supplied to the water jet nozzle by the fluid supply means, and Cutting is performed by rotating the nozzle holder using a rotation drive device.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

The device of the present invention includes a main body 1, a holding means 2 for holding and fixing the main body to the inner wall of the main sheet pile pipe, a nozzle holder 3 held by the main body so as to be rotatable and slidable up and down, and a rotation drive of the nozzle holder. It is comprised of a device 4, a lifting device 5 for a nozzle holder, a water jet nozzle 6 attached to the nozzle holder, and a fluid supply means 7 for supplying fluid to the water jet nozzle from outside the device.

The main body 1 has an outer cylindrical portion 8 in the center, and collar-shaped support portions 9 and 10 are formed at the upper and lower ends of the outer cylindrical portion 8.

The holding means 2 has contact members 11 that are movable in the radial direction of the main body at a plurality of locations in the circumferential direction and the vertical direction of the main body 1. In this embodiment, each abutment member 11 is driven by a hydraulic device 12, and the contact members 11 are driven by a hydraulic device 12, and each abutment member 11 is driven by a hydraulic device 12, and the contact members 11 are driven by a hydraulic device 12, and the contact members 11 are driven by a hydraulic device 12.
placed in place.

The nozzle holder 3 has an upper portion configured as a cylindrical portion 13, and a lower portion having a mounting portion 14 extending horizontally for mounting and storing a water jet nozzle. Such a nozzle holder 3 has bearings 15a and 1 inside the outer cylindrical part 8 of the main body 1 through the upper cylindrical part 13.
It is rotatably held via 5b. Further, a large gear 16 is fitted onto a cylindrical portion 13 that protrudes upward from the outer cylindrical portion 8, and a female screw portion 17 is provided at the upper end of the cylindrical portion 13.

The nozzle holder 3 is capable of sliding up and down relative to the main body 1, so that its cylindrical portion 13 is slidable in the axial direction relative to the large gear 16 and the inner rings of the bearings 15a, 15b. These members are prevented from rotating relative to each other via keys, keyways, and splines. In this embodiment, a key groove 131 is provided in the longitudinal direction of the cylindrical portion 13, and keys are provided in the mounting hole of the large gear 16 and the inner surface of the bearing inner ring, respectively.

In this embodiment, the mounting portion 14 has storage tubes 18a and 18b extending in opposite directions, and each storage tube 18 communicates with the cylindrical portion 13. Any number of storage cylinders 18 can be provided depending on the number of water jet nozzles to be provided.

The rotation drive device 4 has a motor 19 fixed to the main body 1 and a motor 1 to mesh with the large gear 16.
9, and a small gear 21 attached to the output shaft 20 of the nozzle holder 3, so that the nozzle holder 3 can be rotated. Note that 22 is a turning position detector connected to the output shaft 20.

The lifting drive device 5 is rotatably held vertically and rotatably via a bearing (not shown) on a pedestal 23 provided on the upper part of the support portion 9 of the main body 1, and is connected to the female screw of the nozzle holder from the lower end side. A screw shaft 24 screwed into the portion 17, a motor 25 for driving the rotation of the screw shaft, and a clutch 27 provided between the motor output shaft 26 and the screw shaft 24.
It is made up of. The power shaft 28 from the motor side and the screw shaft 24 are connected through bevel gears 29 and 30. 31 is a bearing member.

The water jet nozzle 6 is mounted in a storage cylinder 18 which is a mounting portion 14 at the bottom of the nozzle holder. In this embodiment, water jet nozzles 6a and 6b are respectively disposed in a pair of storage cylinders extending in opposite directions so as to inject fluid onto the inner wall of the sheet pile main pipe in 180° opposite directions. Each water jet nozzle 6 is capable of moving forward and backward in the radial direction of the main sheet pile pipe. Therefore, a slide base 32 is fixed in each storage cylinder 18, and the nozzle body 33 is attached to this slide base 32 via a slide metal fitting 34.
It is slidably attached to the At the back of this sliding metal fitting 34, a storage tube 18 is attached to the main body.
A rod 36 of a cylinder device 35 fixed to the housing cylinder 18 is connected to the nozzle body 33 so that the nozzle body 33 can be moved out and out of the opening 181 on the entire surface of the storage tube 18 and moved forward and backward toward the inner wall.

FIG. 3 shows the cross-sectional structure of the nozzle body 33, in which a nozzle hole 37 is formed at the tip, and
High pressure water supply port 38 and abrasive supply port 3 at the rear
9 are provided separately.

The fluid supply means 7 is constituted by a flexible hose, which is led from outside the device (outside the steel pipe sheet pile) into the storage cylinder 18 through the cylindrical part 13 of the nozzle holder 3, and is connected to the nozzle body 33. has been done. Two types of hoses are used: one for high-pressure water and one for abrasives.

In other drawings, reference numeral 40 denotes a suspension rope for suspending or hoisting the entire apparatus within the main sheet pile pipe, and is connected to the upper part of the main body 1. Also, 41
is a stopper ring fixed to the cylindrical portion 13.

Note that in the present invention, the water jet nozzle 6
By providing a plurality of nozzles in the circumferential direction, the cutting speed can be increased accordingly, and for this reason, the above-mentioned nozzles can be provided in three or more directions, but in some cases, a configuration in which only one nozzle is provided is possible. It is also possible to do so.

Next, how to use the device of the present invention will be explained.

The apparatus A is suspended from the upper end of the sheet pile main pipe A by a hanging rope 40 to the intended cutting position inside the main pipe A. At this position, each contact member 11 constituting the holding means 2 is pushed out by the hydraulic device 12 and pressed against the inner wall a of the sheet pile main pipe A, thereby holding and fixing the device A to the inner wall a.

In this state, fine level adjustment of the cut portion is performed. That is, the screw shaft 24 is rotated by the motor 25 of the elevating drive device 5 via the clutch 27 and bevel gears 29, 30, and as a result, the nozzle holder 3 moves up and down while sliding with respect to the main body 1, and the nozzle position is adjusted. adjustments will be made. With conventional devices, such level adjustment of the cutting position had to be done by releasing the holding means and raising and lowering it using a hanging rope, which required a long time to adjust, but with the present invention. The level of the device can be adjusted while the main body of the device is fixed to the inner wall, and the adjustment can be done in a short time. Further, the nozzle main body 33, which has been retracted into the storage tube 18, is moved forward to approach the inner wall a to a predetermined position.

Next, the cutting work begins, but in this case, first,
Disengage the clutch 27 to allow the screw shaft 24 to rotate freely relative to the motor side. Then, high-pressure water (approximately 3000 to 4000 kg/cm ² ) and abrasive are supplied to the water jet nozzles 6a and 6b via the supply means 7, and the mixed fluid is injected from the nozzles toward the inner wall of the main sheet pile pipe. At the same time, the motor 19 of the rotation drive device 4 is driven,
The nozzle holder 3 is rotated via the small gear 21 and the large gear 16, and the water jet nozzles 6a and 6b are turned in the circumferential direction, thereby cutting the steel pipe sheet pile in the circumferential direction. The high-pressure water and abrasive are fed under pressure to the nozzle via a supply means 7 by a pressure intensifier installed on the ground. In this embodiment, cutting is completed when the nozzle holder 3 has rotated approximately 180 degrees.

In such a cutting method of the present invention, since the cutting means is a high-pressure fluid injected from a nozzle, not only the sheet pile main pipe A but also the joint portion can be appropriately cut.

In the present invention, any fluid can be selected as the fluid for the water jet nozzle; for example, high-pressure water itself can be used as the cutting fluid.

〔Effect of the invention〕

According to the present invention described above, the high-pressure fluid injected from the water jet nozzle is used as the cutting means, and the jet nozzle can be appropriately rotated along the inner surface of the steel pipe sheet pile. It has the advantage of being able to cut appropriately and easily in the circumferential direction, and also being able to adjust the level for cutting while the main body of the device remains fixed to the inner wall of the main sheet pile pipe, eliminating the need to pre-cut the joints as in the past. Moreover, efficient and reliable cutting work can be carried out just by performing level adjustment work in a short time.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
FIG. 1 is a longitudinal sectional view, FIG. 2 is a plan view, and FIG. 3 is a longitudinal sectional view of the nozzle body. In the figure, 1 is a main body, 2 is a holding means, 3 is a nozzle holder, 4 is a rotation drive device, 5 is a lifting drive device, 6a and 6b are water jet nozzles, and 7
11 is a fluid supply means, 11 is an abutting member, 17 is a female screw portion, 24 is a screw shaft, and 27 is a clutch.

Claims (1)

[Claims] 1 The main body should have a main body and abutting members that can move forward and backward at multiple locations in the circumferential direction and vertical direction of the main body, and the main body should be held against the inner wall of the steel pipe sheet pile by pressing each abutting member into contact with the inner wall of the steel pipe sheet pile so that they can come into contact with and separate from the inner wall of the steel pipe sheet pile. a holding means; a nozzle holder having a female screw part at the upper end and a water jet nozzle mounting part at the lower part, which is held in the center of the main body through the upper part so as to be horizontally rotatable and slidable in the vertical direction; a rotation drive device for the nozzle holder; a screw shaft that is vertically and rotatably held by a fixed part on the main body side and screwed into the female threaded part from the lower end thereof; and a screw shaft for driving the rotation of the screw shaft. A lifting drive device for a nozzle holder, which comprises a motor and a clutch provided between the output shaft of the motor and a screw shaft, and a lifting drive device for a nozzle holder, which is disposed at a mounting portion of the nozzle holder so as to be movable in a radial direction. A steel pipe sheet pile cutting device comprising a water jet nozzle and a fluid supply means for supplying fluid such as high pressure water to the water jet nozzle from outside the device.