JP6087651B2 - Cutting a metal structure with a diamond wire saw - Google Patents

Description

  The present invention relates to a method for cutting a metal structure with a diamond wire saw.

  Conventionally, a method of cutting a concrete structure is known as a cutting method using a wire saw (see, for example, Patent Document 1). By this cutting method, for example, when cutting a housing that is a concrete structure, an endless diamond wire saw that circulates around the housing via a pulley was placed on a stand that can travel in a direction away from the housing. Winding around the drive pulley, moving the table while rotating the drive pulley, cutting the housing while applying tension to the diamond wire saw.

Registered Utility Model No. 25203310

  In recent years, there has been a demand for cutting not only concrete structures but also metal structures such as ships. Such a metal structure is composed of a steel plate or the like, and unlike a concrete structure, it has a hollow portion inside, so when a diamond wire saw is cut while applying tension, a large force is generated. There exists a subject that a metal structure deform | transforms and it is hard to cut | disconnect by acting. In addition, when a large force acts on the diamond wire saw while being sandwiched between the edges of the cut steel plate due to deformation of the metal structure, the diamond wire saw is damaged and the cutting condition becomes worse, or it breaks. Then, there is a problem that there is a risk of being forced to exchange.

  The present invention has been made in view of the above-described conventional problems, and provides a method for cutting a metal structure with a diamond wire saw that can easily cut the metal structure with a diamond wire saw. With the goal.

The diamond wire saw cutting method according to the present invention is a diamond wire saw driven by a wire saw machine on a pulley provided at the tip of a hoisting boom of a heavy machine and an outer periphery of a metal structure to be cut. And the undulating boom so that the angle formed by the diamond wire saw extending in two directions from the contact portion with the metal structure is equal to or greater than a right angle when the metal structure is cut. Cutting the metal structure by cutting the metal structure by moving the position of the pulley in accordance with the progress of the work and circulating the diamond wire saw in the cutting direction. To do.

  A spacer that prevents the gap of the cut end from narrowing is interposed in the cut end of the metal structure being cut.

  When exchanging the diamond wire saw before the cutting of the metal structure is completed, the diamond wire saw is replaced with the diamond wire saw having an outer diameter smaller than the outer diameter before the replacement.

  In the method for cutting a metal structure using the diamond wire saw according to the present invention, the metal structure can be easily cut using the diamond wire saw.

It is a figure explaining the operation | work which cut | disconnects a ship on the ground which shows suitable one Embodiment of the cutting method of the metal structure by the diamond wire saw which concerns on this invention. It is a perspective view which shows a mode that a wedge is driven into a cut end and cut | disconnects in the case of the cutting operation | work shown in FIG. It is a top view explaining the operation | work which cut | disconnects a ship with a diamond wire saw in water which shows other embodiment of the cutting method of the metal structure by the diamond wire saw which concerns on this invention. It is a side view explaining the mode of the cutting operation | work shown in FIG.

  In the following, a preferred embodiment of a method for cutting a metal structure with a diamond wire saw according to the present invention is described as an example of a work for cutting a ship on the ground as a metal structure, with reference to the accompanying drawings. This will be described in detail. In this embodiment, the ship is cut in the ship width direction. FIG. 1 is a diagram for explaining an operation of cutting a ship on the ground by a method for cutting a metal structure using a diamond wire saw according to the present embodiment.

  As shown in FIG. 1, a ship 2 to be cut by a diamond wire saw 1 is stably placed on a pedestal 4 disposed on the ground 3. That is, a gap S is provided between the ship 2 and the ground 3. And the base 4 is not arrange | positioned in the position where the diamond wire saw 1 is wound around in the ship 2. FIG.

  A portal frame 5 is installed above the ship 2 arranged on the pedestal 4 so as to straddle the ship 2 in the cutting direction. The frame is not limited to the gate shape, and may have any shape such as an L shape. A wire saw machine 6 that drives the diamond wire saw 1 is disposed on the side of the ship 2 and the gate-type frame 5 on the extension of the cutting direction.

  In the wire saw machine 6, a drive pulley 7 around which an endless diamond wire saw 1 is wound is arranged facing the ship 2 side. The wire saw machine 6 is provided so as to be movable along the cutting direction.

  Further, the wire saw machine 6 is provided with two guide pulleys 8 for guiding the diamond wire saw 1 on the side of the ship 2 from the drive pulley 7 with an interval in the vertical direction.

  The gate-type frame 5 sandwiches the ship 2 in the cutting direction and is provided between the two column members 9 and 10 erected on the ground 3 with a space from the ship 2 and between the upper ends of the two column members 9 and 10. And a cross member 11 that is stretched over and fixed. The cross member 11 is fixed to the column members 9 and 10 in a substantially horizontal state with an interval above the ship 2.

  The portal frame 5 is provided with a plurality of pulleys 12a, 13a, 14a, 15a on which the diamond wire saw 1 is wound and guided. Each of the pulleys 12 a, 13 a, 14 a, and 15 a is disposed outside the portal frame 5.

  Vertically moving pulley units 12 and 13 are attached to the column members 9 and 10 so that the pulleys 12a and 13a can be moved in the vertical direction along the column members 9 and 10, respectively.

  The cross member 11 is provided with two pulley units 14 and 15 having four pulleys 14a and 15a. One of the pulley units 14 and 15 is a fixed pulley unit 14 fixed to one end 11 a side of the cross member 11, and the other is close to the fixed pulley unit 14 from the other end 11 b of the cross member 11. It is the movement pulley unit 15 attached so that it could move to a horizontal direction to the position to perform.

  The fixed pulley unit 14 and the movable pulley unit 15 should be versatile so that they can respond to changes in the feeding or winding direction of the diamond wire saw 1 that changes with the progress of the cutting work, and the cutting object and work site. Although it has four pulleys 14a and 15a, it is not restricted to this.

  The pulleys 12 a, 13 a, 14 a, 15 a of the vertically moving pulley units 12, 13, the fixed pulley unit 14, and the moving pulley unit 15 are arranged from the portal frame 5 to the full length of the ship 2 so as not to interfere with the portal frame 5. The pulleys 12a, 13a, adjacent to each other while the diamond wire saw 1 that is arranged so as to protrude in the direction and is bent around each pulley 12a, 13a, 14a, 15a is bent by each pulley 12a, 13a, 14a, 15a, Between the gates 14a and 15a, the portal frame 5 is provided so as to be linearly tensioned.

  Further, the wire saw machine 6 includes a driving pulley 7 and a guide pulley 8, and pulleys 12 a, 13 a, 14 a, and 15 a of the portal frame 5, and pulleys 7, 8, 12 a, 13 a, 14 a, and 15 a that are adjacent to each other. It is installed so that it is tensioned linearly between them. That is, each pulley 12a, 13a, 14a, 15a of the portal frame 5 and the drive pulley 7 and the guide pulley 8 of the wire saw machine 6 are arranged so that the diamond wire saw 1 circulates in the same plane along the cutting direction. Has been.

  In the cutting method of the metal structure by the diamond wire saw 1 of this embodiment, first, the ship 2 to be cut is stably placed on the pedestal 4.

  Next, the portal frame 5 is installed from above the ship 2 (frame installation process). At this time, the wire saw machine 6 is arranged on the side of the ship 2 so that the pulleys 12a, 13a, 14a, 15a of the portal frame 5 and the drive pulley 7 and the guide pulley 8 of the wire saw machine 6 are aligned. To place. The portal frame 5 is installed such that the fixed pulley unit 14 is positioned on the wire saw machine 6 side in the cutting direction.

  Next, the diamond wire saw 1 wound around the drive pulley 7 of the wire saw machine 6 is moved from the upper guide pulley 8 to the pulley 14a of the fixed pulley unit 14, the pulley 15a of the moving pulley unit 15, and the wire saw machine 6. A pulley 12a of a vertically moving pulley unit (backward vertically moving pulley unit) 12 provided on the opposite column member 9 and a vertically moving pulley unit (front side vertically moving pulley) provided on the column member 10 on the wire saw machine 6 side. ) 13 pulley 13a and lower guide pulley 8 are wound in this order (winding step).

  At this time, it winds so that the lower outer periphery of the ship 2 and the diamond wire saw 1 may contact between the pulleys 12a and 13a of the vertically moving pulley units 12 and 13 provided on the two column members 9 and 10, respectively. At this time, the angle formed by the diamond wire saw 1 extending in two directions from the portion in contact with the ship 2, that is, the diamond wire stretched between the pulleys 12 a and 13 a of the vertical movement pulley units 12 and 13. The pulleys 12a and 13a of the vertically moving pulley units 12 and 13 are arranged so that the angle formed by the saw 1 becomes a right angle or more.

  Next, the ship 2 is cut while applying tension to the diamond wire saw 1 by moving the wire saw machine 6 in a direction away from the ship 2 while rotating the driving pulley 7 (cutting step). When cutting the ship 2, as the cutting operation progresses, the pulley 12a of the rear vertical pulley unit 12 is moved in either the vertical direction, the pulley 13a of the front vertical pulley unit 13 is moved upward, and the moving pulley unit By moving the 15 pulleys 15a to the fixed pulley unit 14 side, the angle formed by the diamond wire saw 1 stretched on the pulleys 12a and 13a of the vertically moving pulley units 12 and 13 from the position in contact with the ship 2 is increased. The cutting work will proceed while maintaining a right angle or more.

  FIG. 2 is a perspective view showing a state in which a wedge is driven into a cut end and cut. In proceeding with the cutting operation, as shown in FIG. 2, spacers are interposed between the portions that are separated from each other by forming the cut 16 so that the cut 16 that has already been cut does not narrow due to deformation of the ship 2. For example, the cutting operation is continued in a state where the interval is maintained so that the wedge 17 is driven into the cut 16 and the width of the cut 16 is not narrowed.

  Further, when the diamond wire saw 1 needs to be replaced due to breakage or wear during the cutting operation, the diamond wire saw 1 is replaced with a diamond wire saw 1 having a diameter smaller than that before the replacement, and the cutting operation is continued. This is because, when replacing a new diamond wire saw 1, the diameter of the diamond wire saw 1 that has been worn away by the previous cutting operation is thinner than when not in use, so it is the same as the diamond wire saw 1 before replacement. If it is replaced with an unused one, the new diamond wire saw 1 after replacement cannot be inserted to the already cut position, and the work efficiency is poor.

  According to the method for cutting a metal structure with the diamond wire saw 1 of this embodiment, the ship 2 is cut with the diamond wire saw 1 wound around the pulleys 12 a, 13 a, 14 a, and 15 a provided on the portal frame 5. Therefore, the diamond wire saw 1 can be wound around the ship 2 and cut at a predetermined angle regardless of the shape of the ship 2. For this reason, since it can cut, without concentrating stress on only a part of ship 2, it can cut easily, suppressing a deformation of ship 2.

  At the time of cutting, the pulley 15a of the moving pulley unit 15 and the pulleys 12a and 13a of the vertical movement pulley units 12 and 13 are moved so that the pulleys of the vertical movement pulley units 12 and 13 are moved from the position in contact with the ship 2. Since the angle formed by the diamond wire saw 1 stretched on 12a and 13a is maintained at a right angle or more, the cutting operation can be performed while suppressing the stress concentration.

  Further, during the cutting operation, the wedge 17 is driven into the already cut cut 16 so that the interval between the cuts 16 is maintained, so that the diamond wire saw 1 is not sandwiched or pressed by the cut 16, so It is possible to prevent the diamond wire saw 1 from being excessively worn or broken.

  In the said embodiment, although the example cut | disconnected using the portal frame 5 on the ground was demonstrated, it is not restricted to this.

  FIG. 3 is a plan view illustrating an operation of cutting a ship with a diamond wire saw in water as another embodiment, and FIG. 4 is a side view illustrating the state of the cutting operation illustrated in FIG. 3. In the following description, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 3 and 4, for example, when the ship 2 is cut underwater, the ship 19 to be cut is placed along the crane yard 18 by the crane 19 disposed on the crane yard 18. Perform cutting work by placing them close together.

  A wire saw machine 6 is arranged on the crane yard 18 side, and a backhoe 22 as a heavy machine having a hoisting boom 21 is arranged on a trolley 20 arranged on the opposite side of the crane yard 18 across the ship 2 to be cut. .

  A pulley 21 a is provided on the tip side of the hoisting boom 21 of the backhoe 22. And it arrange | positions so that the drive pulley 7 of the wire saw machine 6 and the pulley 21a of the backhoe 22 may be located in the linear form along the cutting direction of the ship 2. FIG.

  Frames 23 and 24 provided with pulleys 12a, 14a, and 15a are fixed to the upper portion 2a of the ship 2 and the side portion 2b of the ship 2 on the crane yard 18 side along the cutting direction. A moving pulley unit 15 and a fixed pulley unit 14 are provided on the frame 23 of the upper portion 2a of the ship 2 in the same manner as the pulley units 14 and 15 provided on the cross member 11 of the portal frame 5 described above.

  A vertically moving pulley unit 12 is provided on the frame 24 of the side portion 2 b of the ship 2 in the same manner as the pillar member 9 of the portal frame 5 described above. A protective pulley 26 is also provided to protect the diamond wire saw 1 rising from the water surface 25 to the land. At this time, the pulleys 12a, 14a, 15a, 21a of the frames 23, 24 and the backhoe 22 of the upper part 2a of the ship 2 and the side part 2b of the ship 2, the drive pulley 7 and the guide pulley provided in the wire saw machine 6 8 and the protective pulley 26 are arranged so that the diamond wire saw 1 circulates in the same plane along the cutting direction.

  When the ship 2 is cut, the diamond wire saw 1 wound around the drive pulley 7 is provided on the frames 23 and 24 and the backhoe 22 of the upper part 2a of the ship 2 and the side part 2b of the ship 2. It winds so that it may circulate on the outer periphery of the ship 2 through each pulley 12a, 14a, 15a, 21a, the guide pulley 8, and the protection pulley 26 (winding process).

  Thereafter, the diamond wire saw 1 is circulated to start the cutting of the ship 2, and pulleys 12 a and 15 a provided on the frames 23 and 24 of the upper part 2 a of the ship 2 and the side part 2 b of the ship 2 according to the progress of the work. While moving, the hoisting boom 21 of the backhoe 22 is operated to move the pulley 21a at the tip (cutting step).

  As a result, the angle formed by the diamond wire saw 1 stretched between the position in contact with the ship 2 and the pulley 12a of the vertically moving pulley unit 12 and the pulley 21a provided on the backhoe 22 becomes a right angle or more. Keep cutting and proceed.

  According to the method for cutting a metal structure with the diamond wire saw 1 of the present embodiment, the ship 2 can be easily cut even underwater. Further, since the pulley 21a for guiding the diamond wire saw 1 is provided at the tip of the hoisting boom 21 of the backhoe 22 on the opposite side of the wire saw machine 6 with respect to the ship 2, the hoisting boom 21 is operated. Thus, the position of the pulley 21a can be easily changed. For this reason, without concentrating stress only on a part of the ship 2, it is possible to easily cut it while suppressing deformation of the ship 2 at the time of cutting.

  In the above embodiment, the metal structure is a ship. However, the present invention is not limited to this, and for example, a vehicle such as a train or an automobile, an aircraft, or the like may be used.

DESCRIPTION OF SYMBOLS 1 Diamond wire saw 2 Ship 2a Ship upper part 2b Ship side 3 Ground 4 Base 5 Gate frame 6 Wire saw machine 7 Drive pulley 8 Guide pulley 9 Column member 10 Column member 11 Cross member 11a One end of the cross member 11b The other end 12 of the cross member Vertically moving pulley unit (back side vertically moving pulley unit)
12a Pulley 13 Vertical movement pulley unit (Front vertical movement pulley unit)
13a Pulley 14 Fixed pulley unit 14a Pulley 15 Moving pulley unit 15a Pulley 16 Cut 17 Wedge 18 Crane yard 19 Crane 20 Cargo ship 21 Relief boom 21a Pulley 22 Backhoe 23 Frame 24 Frame 25 Water surface 26 Protective pulley S Gap

Claims (3)

A winding step of winding a diamond wire saw driven by a wire saw machine around a pulley provided at a tip of a hoisting boom included in a heavy machine and an outer periphery of a metal structure to be cut;
The pulley is operated by operating the hoisting boom so that an angle formed by the diamond wire saw extending in two directions from a contact portion with the metal structure is equal to or greater than a right angle when the metal structure is cut. A cutting step of cutting the metal structure by circulating the position of the diamond wire saw in the cutting direction by moving the position according to the progress of the work,
A method for cutting a metal structure with a diamond wire saw. 2. The method for cutting a metal structure with a diamond wire saw according to claim 1 , wherein a spacer for preventing the gap of the cut end from being narrowed is interposed in the cut end of the metal structure being cut. Before cutting of the metal structure is completed, when replacing the diamond wire saw, according to claim 1, characterized in that exchanged with the diamond wire saw of smaller outer diameter than the outer diameter before exchange or A method for cutting a metal structure with the diamond wire saw according to 2 .

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