JPH0552370B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a method and apparatus for cutting and removing a cylindrical pile driven into underwater ground or other ground from the inside at a desired level. be.

[Prior art]

Conventionally, when cutting a cylindrical pile made only of steel that has been driven into the underwater ground, cutting methods such as the oxygen arc method, disc cutter method, and grindstone cutter method have been adopted when cutting from inside the pile. When cutting from the outside, the oxygen arc method using a diver or the flame jet method is mainly used.

Also, when cutting a composite cylindrical pile consisting of a steel pipe and a concrete layer integrated inside it, the oxygen arc method using a diver or the flame jet method is used as described above.

However, cutting work from outside the pile is susceptible to the effects of the working environment, particularly tidal currents and waves, which limits the working time and is dangerous. When the work involves carrying out the piles after cutting, the problem arises that one pile must be cut at several places due to restrictions on the size of the lifting machine used for carrying out.

[Purpose and structure of the invention]

An object of the present invention is to provide a method and a device for cutting and removing cylindrical piles, which can advantageously solve the above-mentioned problems. The center holding member 1 is fitted into the cylindrical pile 3, and the upper part of the guide rod 2 is inserted into the cylindrical pile 3.
A pile cutting and removing device 10 is provided on the top of the guide rod 2, and includes a pile cutting tool 5 that projects from the upper end and is rotated by a rotating drive device 4, and a clamp device 9 that is pressed against the inner surface of the cylindrical pile 3. After the pile cutting and removing device 10 is inserted into the cylindrical pile 3 while being guided by the guide rod 2, the upper end of the guide rod 2 is supported by a fixed part.
The clamping device 9 is brought into pressure contact with the upper inner surface of the cylindrical pile 3, and then the pile cutting tool 5 is turned by the turning drive device 4, and the cylindrical pile 3 is cut by the pile cutting tool 5.
The first invention provides a method for cutting and removing a cylindrical pile, which is characterized in that the cutting pile 7 is cut by the clamping device 9, and then the pile cutting and removing device 10 is lifted up. A center holding member 1 that is fitted onto the cylindrical pile 3 is attached to the lower end of the inserted guide rod 2, and is pressed against the pile cutting tool 5 rotated by the rotation drive device 4 and the upper inner surface of the cylindrical pile 3. A second invention provides a cylindrical pile cutting and removing apparatus characterized in that a pile cutting and removing apparatus 10 equipped with a clamping device 9 is fitted into the guide rod 2 so as to be able to move up and down.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 to 12 show a first embodiment of the present invention, in which a circular flange-shaped center holding member 1 is fitted into a cylindrical pile 3 at the lower end of a guide rod 2 extending in the vertical direction. A support tube 8 is fixed to the guide rod 2 and is fitted into the guide rod 2 so as to be movable up and down.
A hanging rope 12 of a lifting machine 11 consisting of a crane is connected to the upper end, and a support member 13 is fixed to the lower end of the support pipe 8 to prevent the cut piles from falling, which are arranged on both sides of the support pipe 8 in the diametrical direction. The proximal end of the member 6 is pivotally connected to the support member 13 by a horizontal shaft 14,
The tip of the cut pile fall prevention member 6 has an acute-angled side surface shape, and the lower part of the support member 13 has a locking part 1 at the lower base end of the cut pile fall prevention member 6.
A horizontal holding stopper 16 for engaging the cut pile 5 is provided, and when the locking part 15 engages with the stopper 16, the upper surface of the cut pile fall prevention member 6 becomes almost horizontal, and the cut pile does not fall from this state. Prevention member 6
is configured such that only upward rotation of the is permitted;
Further, a cutting pile fall prevention device 41 is constituted by the support pipe 8 and the cut pile fall prevention member 6 attached to the lower end thereof.

An annular holding member 18 is fixed to the upper outer periphery of a cylindrical body 17 surrounding the middle portion of the support tube 8 to constitute a cutting device fixing frame 19, and the annular holding member 1
A hanging rope 20 of the lifting machine 11 is connected to 8, and a locking member 21 suspended from the upper end of the cylindrical pile 3 is fixed to the cylindrical pile 8 on both sides of the annular holding member 18 in the diametrical direction. 3, one end of each clamp shoe 22 and one end of a clamping hydraulic cylinder 23 are pivotally connected to the annular holding member 18 by a vertical shaft 24, and the hydraulic cylinder 23 is The other end of the pin 2 is connected to the other end of the clamp shoe 22.
5, the pair of clamp shoes 2
2 and a hydraulic cylinder 2 for the clamp that rotates this.
3 constitute a clamp device 9. When each hydraulic cylinder 23 is extended, each clamp shoe 22 is rotated outward about the vertical axis 24 and pressed against the inner surface of the cylindrical pile 3, and when the hydraulic cylinder 23 is shortened, the clamp shoe 22
is rotated inward about the vertical axis 24 and separated from the inner surface of the cylindrical pile 3.

An annular rack 26 is fixed to a flange integrally provided at the lower end of the cylindrical body 17 with bolts 27, and a rotating annular rail 28 is fixed to the upper part of the annular rack 26 by welding. The pivoting annular rail 28 is arranged concentrically with respect to the guide rod 2.

An annular support member 30 is fixed to the lower end of a holding tube 29 having a partially cut-out circular cross section and is disposed between the support tube 8 and the cylinder 17.
is constructed, and around the annular support member 30,
A plurality of horizontal rollers 32 and vertical rollers 33 facing the outer surface of the support tube 8 are attached at intervals in the circumferential direction of the annular support member 30, and the annular support member 30 is further provided with a turning drive consisting of an electric motor with a speed reducer. A plurality of inner guide rollers 34 and a plurality of outer guide rollers 3 to which the device 4 is fixed and which engage with the inner and outer circumferences of the annular turning rail 28
5 and a plurality of support rollers 36 placed on the upper surface of the swing annular rail 28, and a pinion 37 fixed to the output shaft of the swing drive device 4 is meshed with the annular rack 26, When the swing drive device 4 is operated, the cutting device swing frame 31 is guided by the swing annular rail 28 and swings.

A pile cutting tool 5 consisting of a nozzle that sprays an ultra-high pressure liquid for cutting toward the inner surface of the cylindrical pile 3 is fixed to the annular support member 30, and the pile cutting tool 5 has an ultra-high pressure water supply hose 38 and a polishing tool. Agent supply hose 3
9 is connected to the swing drive device 4, and a power supply control cable 40 is connected to the swing drive device 4, and each of the hoses 38, 39 and the cable 40
It is guided upward through the slit section in the.

The cutting device fixing frame 19, the clamp device 9 attached thereto, the locking member 21, the annular rack 26, the rotating annular rail 28, etc., the cutting device rotating frame 31 and the rotating drive device 4 attached thereto. , the pile cutting tool 5, the pinion 37, etc., constitute a pile cutting and removing device 10, and the pile cutting and removing device 10 is indirectly fitted into the guide rod 2 via the support tube 8.

A hull 42 and a supporting leg 4 fitted therein so as to be able to rise and fall freely.
3 and a supporting leg lifting jack (not shown), each supporting leg 43 in the work boat 44 is pushed down by the supporting leg lifting jack.
The lower end of each support leg 43 is pressed against the underwater ground 45, and then the hull 42 is moved upward and placed above the water surface.

The lifting machine 11 is mounted on the hull 42, and a working floor 47 is attached to the end of the hull 42 so as to be movable in the longitudinal direction and the horizontal direction, and is arranged to face the marine structure 46. The position of the floor 47 in the longitudinal and lateral directions is adjusted by a moving drive device (not shown) such as a hydraulic cylinder provided in the hull 42 . A guide tube 49 having a support flange 48 fixed to its outer periphery is fitted onto the work floor 47, the support flange 48 is placed and fixed on the work floor 47, and support tubes are provided on both sides of the guide tube 49 in the diametrical direction. A fixing jig insertion opening 50 is provided above the flange 48 .

A pair of plate-shaped fixing jigs 51 each having a semicircular recess in the middle are inserted into the opening 50, and the semicircular recesses of each fixing jig 51 are fitted on both sides of the guide rod 2, and each fixing Both ends of the jig 51 are placed on the support flange 48, and a temporary fixing pin 52 is inserted between the end of each fixing jig 51 and the support flange 48.

Next, using the cylindrical pile cutting and removal device according to the first embodiment, the cylindrical pile 3 in the marine structure 46 is
We will explain how to cut it into short pieces and remove it.

First, the work boat 44 is brought close to the marine structure body 53 on the water surface supported by a large number of cylindrical piles 3, and then the supporting legs 43 are lowered and pressed against the underwater ground 45, and the hull 42 and the work floor 47 are raise it to a predetermined level.

Next, the beam members, diagonal members, etc. on the water surface of the marine structure main body 53 are cut by a known oxygen cutting method and removed by the lifting machine 11, and the cylindrical pile to be cut is made into an independent pile. Guide rod 2
is suspended and supported, and its guide rod 2 and center holding member 1 are inserted into a cylindrical pile 3 consisting of a steel pipe 54 and a concrete layer 55 integrally provided inside the pipe. Note that the guide rod 2 and the center holding member 1 attached to its lower end may be inserted into the cylindrical pile 3 before removing the beam members, diagonal members, etc.

Next, the work floor 47 is moved so that the center of the guide tube 49 is placed on the central extension line of the cylindrical pile 3 to be cut or in a position close to this, and then the pile cutting and removal device 10 is moved to the cutting pile fall prevention device 41. The pile cutting and removing device 10 and the cut pile fall prevention device 41 are suspended and supported by a lifting machine 11 while being fitted into the support tube 8 , and the pile cutting and removing device 10 is inserted into the guide rod 2 . Then, the cutting pile fall prevention device 41 is arranged at a lower level than the support flange 48, and then the semicircular recesses in the pair of fixing jigs 51 inserted through the fixing jig insertion openings 50 are inserted from both sides of the guide rod 2 in the diametrical direction. After fitting, the ends of each fixing jig 51 are fixed to the support flange 48 with temporary fixing pins 52.

The guide tube 49 serves to prevent the pile cutting and removing device 10 from swinging until the upper part of the guide rod 2 is temporarily fixed to the support flange 48 via the fixing jig 51 and the temporary fixing pin 52. .

Next, the pile cutting and removal device 10 and the cut pile fall prevention device 41 are lowered by the lifting machine 11, and the locking member 21 of the pile cutting and removal device 10 is hung on the upper end surface of the cylindrical pile 3, and then the clamp device 9 is lowered. The pile cutting device 10 is fixed to the cylindrical pile 3 under tension, and then an ultra-high pressure cutting liquid of 1500 to 3500 kg/cm ² mixed with an abrasive such as garnet powder is applied from the pile cutting tool 5 to the peripheral wall of the cylindrical pile 3. The cylindrical pile 3 is cut over the entire circumference by injecting it toward the target and rotating the pile cutting tool 5 by operating the swing drive device 4.

Next, with the cut pile 7 clamped by the clamp device 9, the pile cutting and removal device 10, the cut pile fall prevention device 41, and the cut pile 7 are lifted up by the lifting machine 11. In this way, when the tip of the cut pile fall prevention member 6 passes the upper end of the cylindrical pile 3 driven into the underwater ground 45, the cut pile fall prevention member 6 automatically rotates to the horizontal position due to its own weight. As the cutting pile fall prevention member 6 is moved, the tip side portion of the cutting pile fall prevention member 6 is placed under the cutting pile 7, so that the cutting pile 7
Even if the cutting pile 7 slips from the clamping device 9, the cutting pile 7 is caught by the cutting pile fall prevention member 6, and therefore the cutting pile 7 is prevented from falling.

Next, when the upper end of the support tube 8 rises to a position close to the fixing jig 51, each fixing jig 51 is removed, and the cutting pile 7, the pile cutting and removal device 10, and the cutting pile fall prevention device 41 are attached to the guide tube. 49 and the cutting pile 7 is lowered onto the hull 42. Next, the above-mentioned process is repeated again to sequentially cut the cylindrical piles 3 into short lengths, and the cut piles 7 are attached to the hull 42.
Place it on.

13 to 15 show a second embodiment of the present invention, in which the support pipe 8, attached cut pile fall prevention member 6, hanging rope, etc. in the first embodiment are omitted, and the annular shape is Support member 30
A horizontal roller 32 and a vertical roller 33 attached to the guide rod 2 face the guide rod 2, but the other structure is the same as that of the first embodiment. In the case of the second embodiment, the pile cutting and removal device 10 is directly guided by the guide rod 2, but the process of cutting and removing the cylindrical pile 3 is the same as in the first embodiment.

When carrying out this invention, a disc-shaped cutter rotated by a drive device may be used as the pile cutting tool 5 instead of a nozzle that sprays ultra-high pressure liquid, and the pile cutting and removing device 10 and cutting As the pile fall prevention device 41, any structure other than that shown in the drawings may be employed.

In addition, when cutting a pile whose entire interior is filled with concrete, it is best to make a hole in the center of the concrete in the pile to create a cylindrical pile, and then cut and remove the cylindrical pile as described above. .

〔Effect of the invention〕

According to this invention, the guide rod 2 having the center holding member 1 at the lower end is inserted into the cylindrical pile 3, and the center holding member 1 is fitted into the cylindrical pile 3, and the upper part of the guide rod 2 is attached to the cylindrical pile. A pile cutting and removing device 10 is provided with a pile cutting tool 5 that protrudes from the upper end of the cylindrical pile 3 and is rotated by a swing drive device 4, and a clamp device 9 that is pressed against the inner surface of the cylindrical pile 3.
The pile cutting/removing device 10 is inserted into the cylindrical pile 3 while being guided by the guide rod 2, and the upper end of the guide rod 2 is supported by a fixed part. 3, so if the current is fast,
When there are large waves, the pile cutting and removing device 10 can be easily inserted into the cylindrical pile 3 by being guided by the guide rod 2, even in narrow or dark places, or the pile can be cut together with the cutting pile 7 clamped by the clamping device 9. The removal device 10 can be easily pulled up and removed, and the pile cutting and removal device 10 can also be easily inserted into and pulled up from the inclined cylindrical pile 3. 10 is inserted into the cylindrical pile 3, the clamp device 9 is brought into pressure contact with the inner surface of the cylindrical pile 3 to clamp it, and then the swing drive device 4 is operated to swing the pile cutting tool 5, thereby cutting the pile. By supporting the device 10 in a stable state, it is possible to easily cut the cylindrical pile 3. Therefore, the cutting work can be performed without relying on a diver, so the cutting work can be performed at low cost and safely. Moreover, since the long cylindrical pile 3 driven into the ground in a narrow space is cut into short pieces and the cut pile 7 is lifted and removed, a small lifting machine is used to remove the long cylindrical pile 3. Effects such as being able to perform cutting and removal work with high efficiency can be obtained.

[Brief explanation of the drawing]

1 to 12 show a first embodiment of the present invention, and FIG. 1 is a side view showing the relationship between an offshore structure and a work boat equipped with a lifting machine that supports a cylindrical pile cutting and removal device. Fig. 2 is the plan view, Fig. 3 is the plan view.
The figure is a partially vertical side view showing a guide tube supported by a cylindrical pile and a work floor and a guide rod with a center holding member, FIG. 4 is an enlarged sectional view taken along the line A-A in FIG. 3,
Figure 5 is an enlarged sectional view taken along the line B-B in Figure 3, Figure 6 is a partially cutaway vertical side view showing the pile cutting and removal device set on a cylindrical pile, and Figure 7 is the lower part of the pile cutting device. FIG. 8 is an enlarged vertical side view of the swing drive section, FIG. 9 is an enlarged cross-sectional view taken along the line CC in FIG. 6, and FIG. 10 is an enlarged view taken along the line D-D in FIG. 6. 11 is an enlarged sectional view taken along the line E--E in FIG. 6, and FIG. 12 is an enlarged sectional view taken along the line FF in FIG. 6. 13 to 15 show a second embodiment of the present invention, in which FIG. 13 is a partially cutaway vertical sectional side view showing a pile cutting and removal device set on a cylindrical pile;
FIG. 14 is an enlarged vertical sectional side view showing the lower part of the pile cutting device, and FIG. 15 is an enlarged sectional view taken along the line GG in FIG. 13. In the figure, 1 is a center holding member, 2 is a guide rod, 3 is a cylindrical pile, 4 is a swing drive device, 5 is a pile cutting tool, 6 is a cutting pile fall prevention member, 7 is a cutting pile,
8 is a support pipe, 9 is a clamp device, 10 is a pile cutting and removal device, 11 is a lifting machine, 12 is a hanging rope, 13
14 is a support member, 14 is a horizontal shaft, 15 is a locking portion, 16 is a horizontal holding stopper, 17 is a cylinder, 18 is an annular holding member, 19 is a cutting device fixing frame, 20 is a hanging rope, 22 is a clamp shoe, 23 2 is a hydraulic cylinder for clamping, 24 is a vertical shaft, 26 is an annular rack, 28 is an annular rail for turning, 29 is a holding cylinder, 3
0 is an annular support member, 31 is a cutting device rotating frame, 34 is an inner guide roller, 35 is an outer guide roller, 36 is a support roller, 37 is a pinion, 3
8 is an ultra-high pressure water supply hose, 39 is an abrasive supply hose, 41 is a cutting pile fall prevention device, 44 is a work boat, 45 is an underwater ground, 46 is an offshore structure, 47 is a working floor, and 48 is a support flange. , 49 is a guide tube,
51 is a fixing jig, and 52 is a temporary fixing pin.

Claims (1)

[Claims] 1. Insert the guide rod 2 with the center holding member 1 at the lower end into the cylindrical pile 3, fit the center holding member 1 into the cylindrical pile 3, and attach the upper part of the guide rod 2 to the cylindrical pile. A pile cutting and removing device 10, which is provided with a pile cutting tool 5 that protrudes from the upper end of the pile 3 and is rotated by a swing drive device 4, and a clamp device 9 that is pressed against the inner surface of the cylindrical pile 3, is attached to the guide rod 2.
and the upper end of the guide rod 2 is supported by a fixed part, and then the pile cutting and removing device 10 is guided by the guide rod 2 to remove the cylindrical pile 3.
After inserting it into the pile, the clamping device 9 is pressed against the upper inner surface of the cylindrical pile 3, and then the pile cutting tool 5 is rotated by the turning drive device 4, and the cylindrical pile 3 is cut by the pile cutting tool 5, Next, the method for cutting and removing a cylindrical pile comprises lifting the pile cutting and removing device 10 while the cutting pile 7 is clamped by the clamping device 9. 2. The center holding member 1 that is fitted into the cylindrical pile 3 is attached to the lower end of the guide rod 2 that is inserted into the cylindrical pile 3, and the pile cutter 5 and the cylindrical pile 3 are rotated by the rotation drive device 4. A pile cutting and removal device 10 comprising a clamping device 9 that is pressed against the inner surface of the upper part.
is fitted into the guide rod 2 so as to be movable up and down.