JPS6145015B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an upper pile holding device for cutting steel pipe piles, which is used when cutting steel pipe piles as foundation piles of various offshore structures, etc. underwater.

Generally, large-diameter, thick-walled steel pipe piles are used as foundation piles for various offshore structures such as bridge foundations, dolphins, and oil drilling jackets. These steel pipe piles must be driven at the same level because the superstructures of the various marine structures mentioned above are connected to their upper parts. Often cut underwater. During this cutting, the upper pile, which is the side of the steel pipe pile that is to be separated, is gradually separated from the lower pile, which is the side that is left behind, as the cutting progresses. As a result, the upper pile gradually loses its restraining force at its lower end and begins to be swayed by waves and the like. As a result, the relative positions of the upper pile and the lower pile may be displaced, and there is a fear that the underwater cutting machine for cutting these may become unusable or the cutting tool may be damaged. Therefore, it is necessary to restrain the pile with some kind of holding device until the cutting of the steel pipe pile is completed. Therefore, conventionally, an upper pile holding device for cutting steel pipe piles (hereinafter abbreviated as holding device) as shown in Figs. 1 and 2 has been used.
is provided.

In Figures 1 and 2, reference numeral 1 indicates a steel pipe pile driven into the seabed, etc., and this steel pipe pile 1 is cut at a cut point 1a at a predetermined position above the seabed surface to form an upper pile 1b. It is separated from the lower pile 1c. For this reason, an underwater cutting machine 2 is installed inside the steel pipe pile 1 to cut the steel pipe pile 1 at the cut point 1a. This underwater cutting machine 2 includes a drive body 2b for driving a rotating shaft 2a, and a plurality of fixing jacks that are attached to the drive body 2b and fix the drive body 2b at predetermined locations on the inner wall surface of the steel pipe pile 1. 2c......, and a cutting tool 2d, such as a grindstone type or disc cutter type, which is attached to the tip of the rotating shaft 2a and cuts the steel pipe pile 1 from the inner wall surface thereof.
In addition, the drive main body 2b and fixed jack 2c
. . . is driven by hydraulic pressure, for example. Therefore, this underwater cutting machine 2 has the following:
A hydraulic hose 3 through which pressure oil, which is a driving source for the fixed jack 2c and the driving body 2b, is guided is connected through the steel pipe pile 1 from a work boat or the like on the sea (not shown).

On the outside of this steel pipe pile 1, a holding device 4 consisting of a temporary receiving pile 4a and plate materials 4b, 4b is provided. The temporary receiving pile 4a is generally made of steel such as H steel, and is driven into the seabed to a required depth along the longitudinal direction of the steel pipe pile 1 while being in contact with the outer wall thereof. The upper end surface of this temporary receiving pile 4a is at approximately the same horizontal position as the upper end surface of the steel pipe pile 1,
The upper pile 1b of the steel pipe pile 1 is held by the temporary support pile 4a by passing plate materials 4b, 4b to the upper end surfaces of these partners and welding them, respectively.

In such a holding device 4, as described above, the steel pipe pile 1 is such that the upper pile 1b is attached to the temporary receiving pile 4 at its upper end surface.
While being held at position a, it is cut at the point to be cut 1a. After this cutting, the underwater cutting machine 2 is supported by a floating crane or the like (not shown) via the wire 5, and the pressure oil led from the hydraulic hose 3 is depressurized, so that the fixed jack 2c... It is released from the inner wall of the steel pipe pile 1, lifted up, and removed. Next, the plates 4b, 4b of the holding device 4 are removed while the cut upper pile 1b is supported by the above-mentioned crane, etc., and the upper pile 1b, which is no longer restrained, is lifted up. will be completely eliminated. Subsequently, the temporary receiving pile 4a is removed, thereby completing the cutting work of the steel pipe pile 1.

However, such a holding device 4 has a disadvantage in that a large amount of construction cost and labor is required to drive the temporary receiving pile 4a.

In addition, in this holding device 4, the upper pile 1b of the steel pipe pile 1 is held only by its upper end surface, so when the weather conditions at sea deteriorate, the upper pile 1b may be cut due to high waves caused by this. There was also a safety problem, as there was a risk of the machine shaking as it was being cut, making it impossible to carry out cutting work.

Moreover, in the holding device 4 using this temporary support pile 4a, when the position of the cut portion 1a of the steel pipe pile 1 to be cut is deep, the temporary support pile 4a becomes extremely long and does not sufficiently restrain the upper pile 1b. In addition, if the steel pipe pile 1 is a diagonal pile driven diagonally, one temporary support pile alone will not be able to hold it sufficiently, and the upper pile will begin to move as it is cut. There was a problem that both of them were unsuitable for use.

The present invention has been made in view of the above circumstances, and is an upper pile for cutting steel pipe piles that can easily and reliably prevent swinging of the piles and has excellent cutting work safety when cutting various steel pipe piles. The object is to provide a holding device.

The present invention will be explained below based on the drawings.

3 and 4 show an embodiment of the holding device of the present invention, and parts common to those shown in FIGS. 1 and 2 are given the same reference numerals to simplify the explanation. become

In FIG. 3, this holding device 6 includes a holding hardware 7,
It is composed of a hanging jig 8 and wires (hanging members) 9, 9. The holding hardware 7 is used to hold the upper pile 1b and the lower pile 1 when the steel pipe pile 1 is cut.
c and integrally surround them from the outside to prevent them from being displaced from each other, and is made up of a cylindrical body 10 and ribs 11. The length of this cylinder 10 in the longitudinal direction is 1.5 to 2 times the outer diameter of the above-mentioned steel pipe pile 1, and its inner diameter is one degree larger than the outer diameter of this steel pipe pile 1. Ribs 11... are fixed. This rib 1
1... is an elongated plate having a predetermined thickness, the length of its long side is equal to the length in the longitudinal direction of the cylindrical body 10, and the length of its short side is equal to the inner radius of this cylindrical body 10 and the above-mentioned The diameter is approximately equal to the difference between the radius and the outer radius of the steel pipe pile 1. As shown in FIGS. 3 and 4, these ribs 11... have their respective longitudinal directions directed toward the longitudinal direction of this cylindrical body 10, and their respective lateral directions directed toward the central axis of this cylindrical body 10. With,
They are welded to the inner surface of the cylindrical body 10 at predetermined intervals along the circumference of the inner surface of the cylindrical body 10 . Further, on the end faces 11a of these ribs 11 facing the center of the cylindrical body 10, a rectangular notch recess 11b is formed approximately at the center in the longitudinal direction. The holding hardware 7 is suspended via wires 9 of a predetermined length from a hanging jig 8 suspended by a lifting means such as a floating crane (not shown), and is suspended from the upper part of the steel pipe pile 1. Each end surface 11a of the rib 11 is lowered downward so as to come into contact with the outer circumferential surface of the steel pipe pile 1, and the cutout recess 11b is the cut point of the steel pipe pile 1. It is held by the crane or the like at a position surrounding 1a from the outside. Here, the position of the cut point 1a can be set in advance as the length from the upper end surface of the upper pile 1b. Therefore, the wires 9, 9 suspended from the hanging jig 8
The length of the holding metal fitting 7 is set in advance to correspond to the length to the cut point 1a.
The positioning can be performed by the length between the hanging jig 8 and the upper end surface of the upper pile 1b.

In such a holding device 6 having the above configuration,
The holding hardware 7 can be positioned at the cut point 1a of the steel pipe pile 1 to be cut at approximately the center in the longitudinal direction thereof, and can be provided so as to integrally surround the upper pile 1b and the lower pile 1c. Even if a force is applied to the upper pile 1b to tilt it during cutting, the upper pile 1b contacts and is supported by the end surface 11a of the holding hardware 7, so that it will not tilt. Moreover,
Since the cutout recess 11b of the holding hardware 7 is arranged on the outside of the cut point 1a, after cutting the cut point 1a, the ribs 11...
The cutting tool 2 will not cut...
There is no risk of damaging d. After cutting such a holding device 6, if the wires 12, 12 are attached from the lifting jig 8 to the upper pile 1b, the upper pile 1b can be attached by simply lifting the lifting jig 8 with a crane or the like.
can be removed from the lower pile 1c together with the underwater cutting machine 2.

In the explanation of the above embodiment, the length of the holding fitting 7 was set to be 1.5 to 2 times the outer diameter of the steel pipe pile 1, but the length is not limited to this. The length may be sufficient as long as it can sufficiently prevent the enclosure and the upper pile 1b from falling.

As explained above, the upper pile holding device for cutting steel pipe piles of the present invention includes: a hanging jig suspended above a steel pipe pile that is cut at a predetermined position and the upper pile is separated from the lower pile; It is hung from a hanging jig via a hanging material, is fitted so as to cover the area to be cut between the upper pile and the lower pile of the steel pipe pile, and is connected to the upper pile before and after cutting. It comprises a lower stake and a holding hardware for holding the lower stake. Therefore, in this holding device, since the holding hardware holds the upper pile and the lower pile at the location to be cut, the upper pile can be reliably held during cutting, thereby making it easier to cut. Safety can be improved.

Further, according to this holding device, even when cutting a diagonal pile, which has been difficult in the past, it is possible to hold the pile at the point to be cut in the same manner as described above, so that the cutting operation described above can be easily performed. Furthermore, cutting in deep water can be easily done if the length of the hanging material is set to a specified length and the holding hardware is held in place using the position of the hanging jig above the sea surface as a guide. can be done.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of a conventional upper pile holding device for cutting steel pipe piles. Figure 1 is a side configuration diagram, Figure 2 is a - line view of Figure 1, Figure 3 and FIG. 4 shows an embodiment of the upper pile holding device for cutting steel pipe piles of the present invention, FIG. 3 is a side configuration diagram, and FIG. 4 is a sectional view taken along the line -- of FIG. 3. 1...Steel pipe pile, 1a...Point to be cut, 1b...
Upper pile, 1c... Lower pile, 4... Holding device, 4a...
Temporary receiving pile, 4b...Plate material, 6...Holding device, 7...
Holding hardware, 8...hanging jig, 9...wire.

Claims (1)

[Scope of Claims] 1. A hanging jig that is suspended via a hanging means above a steel pipe pile that is cut at a predetermined position and whose upper pile is separated from its lower pile; and The steel pipe pile is suspended through a retaining material and is fitted to cover the area to be cut between the upper and lower piles of the steel pipe pile, thereby holding the upper and lower piles before and after cutting. An upper pile holding device for cutting steel pipe piles, comprising a holding hardware for cutting steel pipe piles.