JP2018150739A - Decomposition method for cutting stacked layers of a plurality of metal plates - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method to allow cutting to be smoothly performed when a plurality of metal plate members stacked each other are decomposed by cutting with a bandsaw.SOLUTION: A plurality of tank side plates 12 (metal plate members) removed from a cylindrical assembled tank 10 are stacked each other. A gap 54 is formed between the tank side plates 12 on a predetermined cutting section 55. A gap length of the gap 54 is set to the gap length enough for a blade 78 not to contact a subsequent cutting tank side plate 12 while the blade 78 of a bandsaw 72 cuts the tank side plate 12. The blade 78 of the bandsaw 72 is arranged facing opposite to a surface of the tank side plate 12 at the predetermined cutting section 55. Each of the tank side plates 12 is cut sequentially by relatively moving the blade 78 in a stacking direction of the tank side plates 12.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a method of stacking a plurality of metal plate members, cutting them with a band saw, and disassembling them so that the cutting can be performed smoothly.

  As a structure constituted by connecting metal plate members, for example, there is a side wall of a cylindrical assembly type tank described in Patent Documents 1 and 2. The side wall of this cylindrical assembly type tank is formed by connecting a plurality of laterally curved rectangular metal plate members (side plates) in the horizontal direction to form a single cylinder, and connecting the cylinders by stacking a plurality of cylinders. And has a cylindrical structure.

JP 2013-035599 A International Publication No. 2013/021821 Pamphlet

"Flange tank dismantling work", [Search January 14, 2017], Internet <URL: http://www.tepco.co.jp/news/2014/images/141224f.pdf> “Disassembly and removal of flange tanks in H1 and H2 areas”, [Search on January 14, 2017], Internet <URL: http://www.nsr.go.jp/data/000096876.pdf> "Overview of flange tank dismantling and cutting work", [Search on January 14, 2017], Internet <URL: http://www.tepco.co.jp/nu/fukushima-np/handouts/2015/images /handouts_150623_04-j.pdf>

  When a structure constituted by connecting metal plate members finishes its function and is disassembled, the individual metal plate members are removed from the structure. In addition, when the removed individual metal plate member is large, in order to facilitate transportation, storage and the like, the metal plate member may be further cut and disassembled. When performing this cutting, it is inefficient to cut each sheet individually. Therefore, it is conceivable to stack a plurality of metal plate members and cut them at once with a band saw.

  The present inventors have developed a method of disassembling the side plate of the cylindrical assembly type tank, and this method was used in the construction described in Non-Patent Documents 1 to 3. In this method, a plurality of side plates are stacked and supported by jigs, and a blade of a band saw (saw blade) is disposed above the side plate so as to face the surface of the side plate, so that the blade travels (circulates). However, the blades are moved in parallel downward to cut the stacked side plates. However, in this practical method, the blade is disconnected from the wheel (pulley) that circulates the blade during cutting, or the side plate is cut in a direction inclined with respect to the vertical direction (the cut surface is not a vertical surface). Such as an inclined surface).

  The present invention solves the above-mentioned problems, and provides a cutting and disassembling method in which a plurality of metal plate members can be arranged in a stacked manner and cut and disassembled with a band saw so that the cutting can be performed smoothly. is there.

  The method of laminating, cutting, and disassembling a metal plate member according to the present invention is a method of cutting and disassembling a plurality of metal plate members with a band saw, the method comprising: cutting the plurality of metal plate members into the metal plate at a planned cutting position. In a state in which a gap is formed between the members and stacked, the band saw blade is disposed facing the surface of the metal plate member, and is relatively moved in the stacking direction of the metal plate member, and the cutting is performed at the planned cutting position. In this method, the metal plate members are sequentially cut, and the gap length of the gap is such that the blade does not hit the metal plate member to be cut next while the blade cuts one metal plate member. Is set to.

  According to the experiments by the present inventors, it has been found that the cause of the above-described problem is that the blade partially hits the side plate of the lower layer while cutting the side plate of the upper layer. . That is, when cutting is performed in a posture in which the blade is inclined slightly in the running direction with respect to the side plate surface in order to facilitate cutting, the cutting of the side plate proceeds quickly at one end portion of the entire cutting length. Slowly behind the club and gradually reach the rest. For this reason, even if cutting is completed at the one end, the remaining part is in the middle of cutting. Then, before the cutting of the side plate of the upper layer is completed with the entire length of the cutting, the blade tries to start cutting by hitting the side plate of the lower layer at the one end portion. It was found that this was the trigger for the above problems. Even when the blade is cut with respect to the surface of the side plate without inclining the blade in its running direction (in a horizontal posture), the cutting proceeds in a posture in which the blade is bowed in the vertical direction due to the reaction force from the side plate. Therefore, the cutting progressed quickly at both ends of the entire length of the cut, and before the cutting of the upper layer side plate was completed at the entire length of the cut, the blade began to hit the side plate of the lower layer at the both ends, resulting in the same problem.

  According to the method for laminating, cutting, and disassembling the metal plate member of the present invention, cutting is performed in a state in which a gap is formed between the metal plate members at a planned cutting position, and the gap length of the gap is set to the one blade. During cutting of a metal plate member, the gap length is set so that the blade does not hit the next metal plate member to be cut next, so that it is possible to prevent the blade from hitting the next metal plate member while cutting one metal plate member. Thus, cutting can proceed smoothly.

  According to the method of the present invention, a side plate spacer is sandwiched between the metal plate members to form a necessary gap length of the gap. According to this, the required gap length of the gap between the metal plate members can be formed by the side plate spacer. Moreover, the method of this invention can perform the said cutting | disconnection in the state which arrange | positioned the jig | tool facing and supported the said several metal plate member to the said opposing jig | tool, respectively. According to this, it can cut | disconnect in the state which each supported the several metal plate member to the jig | tool which opposes. Further, in the present invention, the plurality of metal plate members are fixed and assembled to the jig in a state in which the jig is disposed and fixed to the temporary assembly base, and the jig is assembled in the assembled state. Remove the temporary assembly from the temporary assembly base, lift the assembled jig and metal plate member from the temporary assembly base, transfer them to the work table, fix the jig to the work table, and remove the work table and the band saw. The metal plate member can be cut by moving the relative position to position the planned cutting position on the band saw. According to this, the temporary assembly work and the cutting work can be performed in parallel at different places, and the work efficiency is improved as compared with the case where the temporary assembly work and the cutting work are alternately performed at the same place. Here, the temporary assembly base is configured such that the jigs are arranged to face each other to form an accommodation space opened upward between the jigs, and the plurality of metal plate members are accommodated and stacked in the accommodation space. it can. According to this, a plurality of metal plate members can be stacked and disposed in the accommodation space sandwiched between the jigs facing each other as a guide. Further, the temporary assembly base includes a pair of jigs in a second direction disposed opposite to each other in a direction orthogonal to the pair of jigs in the first direction, with the opposing jigs serving as a pair of jigs in the first direction. The housing space is surrounded by the jig pair in the first direction and the jig pair in the second direction, and the plurality of metal plate members can be housed and stacked in the enclosed housing space. According to this, a plurality of metal plate members can be guided in both directions orthogonal to each other by the jig pair in the first direction and the jig pair in the second direction, and can be stacked in the accommodation space. Moreover, in this invention, the said jig | tool adjacent on both sides of the scheduled cutting location of the said metal plate member is supported by the said work table so that it can mutually isolate | separate, The cut piece of the said metal plate member was supported by the said jig | tool. The jig can be removed from the work table and transferred, and the cut piece can be removed from the jig at the transfer destination. According to this, the cutting of the side plate and the removal of the cut piece of each cut block from the jig can be performed at different places. Further, in the present invention, for example, the adjacent jigs can be separated from each other across the planned cutting position of the metal plate member, and the adjacent jigs are stretched and connected by a stretching member. The assembled jig and the metal plate member can be lifted from the temporary assembly base and transferred to the work table. According to this, when the assembly of the jig and the metal plate member is lifted from the temporary assembly base and transferred to the work table, the assembly is restrained from being bent and deformed by its weight. The assembly can be transferred to the work table. Further, when removing the cut piece from the jig at the transfer destination, for example, using a detachment stand having a receiving metal fitting, the receiving metal piece is inserted into the gap between the cut pieces, and the receiving piece is received. The cut piece can be removed from the jig while being received and supported by the metal fitting. According to this, by supporting the cut piece on the metal fitting, the cut piece can be removed from the jig without dropping.

  In the present invention, the plurality of metal plate members are metal plate members that are curved with substantially the same curvature and have substantially the same length, and the plurality of metal plate members can be laminated with their curved directions matched. According to this, by laminating a plurality of metal plate members that are curved with substantially the same curvature and have substantially the same length, the gaps are inevitably interposed between the metal plates at an intermediate position in the bending direction. Can be formed.

In embodiment of the cutting | disconnection disassembly method of this invention, it is a front view which shows the side plate unit which complete | finished the transfer (replacement) to a slide table. It is the same top view. It is a perspective view which shows an example of the whole structure of a cylindrical assembly-type tank, and shows it in the state which removed the top plate. It is a front view which shows the structural example of the one side plate of the cylindrical assembly-type tank of FIG. It is the same top view. It is a perspective view which shows the first process of the temporary assembly process in embodiment of the cutting | disassembly method of this invention. It is a perspective view which shows the process following FIG. 4A of a temporary assembly process. It is a perspective view which shows the process following FIG. 4B of a temporary assembly process. It is a perspective view which shows the process following FIG. 4C of a temporary assembly process. It is a perspective view which shows the process following FIG. 4D of a temporary assembly process, and shows the state which the temporary assembly process was complete | finished. It is a perspective view which shows the first process of the transfer process following a temporary assembly process. It is a perspective view which shows the process following FIG. 4F of a transfer process, and shows the state which the transfer process was complete | finished. It is a perspective view which shows the first process of the cutting process following a transfer process. It is a perspective view which shows the first process of the removal process following a cutting process. It is a perspective view which shows the process following FIG. 4I of a removal process. It is a perspective view which shows the process following FIG. 4J of the removal process. It is a perspective view which shows the process following FIG. 4K of a removal process. It is a perspective view which shows the process following FIG. 4L of a removal process. It is a disassembled perspective view which shows the support structure of the side plate by the scale in embodiment of this invention. It is a front view which shows the side plate unit completed by the temporary assembly. It is the same top view. This is the same aspect. It is the A section enlarged view of FIG. 6A. It is a front view which shows a cutting line. It is the same top view. This is the same aspect. It is a front view which shows the removal operation | work of the 1st cutting block or the 5th cutting block using the 1st and 5th cutting block shared removal stand. It is a front view which shows the removal operation | work of the 2nd cutting block or the 4th cutting block using the 2nd and 4th cutting block shared removal stand. It is a front view which shows the removal operation | work of the 3rd cutting block using the removal stand for 3rd cutting blocks. It is the same side view.

  An embodiment of a cutting and disassembling method according to the present invention will be described. In this embodiment, a case where the side plate 12 (tank side plate) of the cylindrical assembling tank 10 shown in FIG. 2 is cut and disassembled will be described. The structure of the cylindrical assembly type tank 10 of FIG. 2 will be described. This tank is, for example, 12 meters in diameter and 1,200 cubic meters in volume. The tank 10 forms a side wall 14 (body part) by connecting a plurality of side plates 12 having the same structure in the horizontal direction (circumferential direction of the cylinder) and the vertical direction (axial direction of the cylinder). Each side plate 12 is made of steel and has a horizontally long rectangular shape (rectangular shape) having a longitudinal direction extending in the horizontal direction and a short direction extending in the vertical direction. The surface of the side plate 12 is curved in an arc shape in one direction (horizontal direction, longitudinal direction), and is flat in other orthogonal directions (vertical direction, short direction). The length of one side plate 12 in the circumferential direction is a quarter of a circle (90 degrees in angle), and the four side plates 12 are sequentially connected with a bolt and a nut in the bending direction to form a one-stage cylinder 16. Is configured. The cylinder 16 is stacked in a plurality of stages (four stages in FIG. 2) and connected with bolts and nuts to form a cylindrical side wall 14. The upper and lower cylinders 16 adjacent to each other are stacked so as to be shifted from each other by 45 degrees in the circumferential direction. The lower opening of the lowermost cylinder 16 is closed by a circular bottom plate that does not appear in FIG. The upper opening of the uppermost cylinder 16 is closed with a circular top plate (not shown).

  One side plate 12 is shown in FIG. 3A (front view) and FIG. 3B (plan view). Connection flanges 18 are formed outward on the left and right short sides of the side plate 12 over the entire length, and connection flanges 20 are formed outward on the upper and lower long sides, respectively. The connecting flange 18 is used to connect the side plates 12 adjacent in the lateral direction with bolts and nuts. The connecting flange 20 is used to connect the cylinders 16 adjacent to each other in the vertical direction, or between the cylinder 16 and the top plate, or between the cylinder 16 and the bottom plate with bolts and nuts. A plurality of bolt through holes 22 (connection holes) are formed in the connection flange 18 at equal intervals in the vertical direction and at the same height position between the left and right connection flanges 18 and 18. Reinforcing ribs 24 that connect and reinforce the connecting flange 18 and the outer surface of the main body of the side plate 12 are disposed at intermediate positions between the adjacent bolt through holes 22 and 22 of the connecting flange 18. The connecting flanges 18 of the side plates 12 adjacent to each other in the lateral direction are brought into contact with each other, and nuts are screwed into the bolt through holes 22 and 22 that are in communication with each other from the opposite side. Are concatenated. A plurality of bolt through holes 26 (connection holes) are formed in the connection flange 20 at equal intervals in the left-right direction and at the same lateral position between the upper and lower connection flanges 20, 20. The connecting flanges 20 of the side plates 12 adjacent to each other in the vertical direction are brought into contact with each other, and nuts are screwed in from all sides to the bolt through holes 26, 26 communicating with each other. That is, the cylinders 16 are connected to each other.

  The disassembly of the cylindrical assembling tank 10 that has finished its function is to remove the bolts and nuts, remove the top plate (not shown), remove the individual side plates 12 from the side walls 14, and then remove the bottom plate. Is done. The removed side plate 12 is cut and disassembled by the following method, and is cut into pieces that can be easily transported by a container or the like.

The whole process of cutting and disassembling the side plate 12 is shown in FIGS. 4A to 4M. This whole process consists of the following steps.
(1) Temporary assembly process: A plurality of side plates are stacked on a temporary assembly stage, fixed to an equal, and integrated as a side plate unit.
(2) Transfer process: Transfer the side plate unit to the slide table of the cutting line.
(3) Cutting process: The longitudinal direction of the side plate unit is cut into a plurality of blocks (cutting blocks) with a band saw.
(4) Unloading process: Remove each cutting block and unload it to the stage.
(5) Removal process: At the removal stage, the cutting block is detached into individual scales and individual cutting pieces using a cradle and separated.
Each step will be described below.

(1) Temporary assembly process (FIGS. 4A to 4E)
<< Figure 4A >>
On the both sides in the longitudinal direction of the upper surface of the steel temporary assembly base 28 arranged on the temporary assembly stage adjacent to the cutting line 62 (FIGS. 7A, 7B, 7C), a frame made of steel and having the same structure (front shape is a right triangle) A total of four positioning scales 30 (a pair of jigs in the second direction) are arranged opposite to each side and fixed with bolts 32 respectively. The positioning scale 30 is for positioning the longitudinal direction of the side plate 12. The bolt through hole 30a (FIG. 6B) of the positioning scale 30 is a long hole that is long in the facing direction of the positioning scale 30. With this, the opposing positioning scale 30 is fixed to the temporary frame 28 by finely adjusting the respective positions. I can do it. The positioning scale adjustment jig 31 performs this fine adjustment. By adjusting the position of the positioning plate 30, the distance between the opposing positioning units 30 on the temporary frame 28 is adjusted according to the slight difference in the length of the side plate 12 due to the difference in the manufacturer. The longitudinal direction can be positioned almost without backlash. Further, a steel plate 33 is fixed with bolts (not shown) on the upper surface of the temporary assembly base 28 at places where the left and right ends of the lowermost side plate 12 are placed and supported.

<< FIGS. 4B to 4C >>
Steel scales 34 (34-1 to 34-5), 36 (36-1 to 36-5) (jigs) (jigs in the first direction) (jigs in the first direction) are provided on both sides of the upper surface of the temporary assembly base 28 in the lateral direction. Five units on each side are arranged to face each other along the longitudinal direction, and are fixed with bolts 38 respectively. FIG. 4B is a state in the middle of the operation of fixing the scales 34 and 36 to the temporary frame 28, and shows a state where the wire rope 39 is hung on the scale 36-3 and suspended by the crane hook 41 and lowered to the temporary frame 28. Show. FIG. 4C shows a state in which the fixing operation has been completed. On the upper surface of the temporary frame 28, a large number of tap holes are formed at predetermined vertical and horizontal pitches for screwing bolts 32 for fixing the positioning scale 30, bolts 38 for fixing the scales 34 and 36, bolts for fixing the base plate 33, and the like. . By fixing the positioning scale 30 and the scales 34 and 36 to the temporary frame 28, an accommodation space 40 that is surrounded by the positioning scale 30 and the scales 34 and 36 and opens upward is formed. The side plates 12 are suspended one by one by a crane and are sequentially accommodated in the accommodation space 40 from the upper opening. In the accommodation space 40, a plurality of side plates 12 are accommodated in a stacked state with gaps 54 formed between the respective layers, and fixedly supported on the scales 34 and 36, respectively. Each of the scales 34 and 36 is formed in a frame shape having a rectangular front shape, and the left and right support columns 44 (refer to the scale 36-3 in FIG. 4B) are formed of channel steel, and the grooves of the channel steel are directed outward. It is arranged. On the bottom surface of the channel steel of the support column 44 (the back surface of the groove), there are a plurality of elongated bolt through holes 46 (connection holes) for passing bolts for fixing the side plate 12 along the support column 44 (however, both left and right ends). The bolt through holes 46 of the right and left outer support columns 44 of the scales 34-1, 34-5, 36-1, and 36-5 are formed at one location. The heights of the scales 34 and 36 are such that the central scales 34-3 and 36-3 are high in accordance with the support of the side plate 12 in a mountain-like posture, and the right and left scales 34-2, 34-4 and 36 are high. −2, 36-4 is lower than that, and the left and right end scales 34-1, 34-5, 36-1, 36-5 are formed lower than that. The scales 34-1 and 36-1 have the same structure except that the side plate guide column 36a protrudes upward from the scale 36-1. The side plate guide column 36a facilitates the operation of accommodating the side plate 12 in the accommodation space 40 by lowering the side plate 12 suspended by a crane while applying it to the side plate guide column 36a. The scales 34-1 and 34-5 have the same structure. The scales 36-1 and 36-5 have the same structure. The scales 34-2, 34-4, 36-2, and 36-4 have the same structure. The scales 34-3 and 36-3 have the same structure. The facings of the scales 34-1 to 34-5 and the scales 36-1 to 36-5 are fixed to the same position in the longitudinal direction of the temporary frame 28, respectively. Four gaps 42 (42-1 to 42-4) are formed between the adjacent ones of the scales 34-1 to 34-5 and 36-1 to 36-5 in the longitudinal direction of the temporary frame 28. Has been. The laminated side plates 12 are cut at the center positions of the four gaps 42.

<< FIGS. 4D to 4E >>
After the positioning scale 30, the base plate 33, and the scales 34 and 36 are fixed to the temporary assembly base 28, the side plate 12 removed from the tank 10 is arranged in a mountain shape with the curved mountain facing upward, and the bolt through hole 26. A wire rope 39 is hung on and suspended by a hook 41 of a crane, and is moved into the accommodation space 40 from the upper opening and accommodated, and both end portions in the longitudinal direction of the side plate 12 are abutted and supported on the floor plate 33. Next, as shown in FIG. 5, the bolts 48 are passed from the accommodation space 40 side by aligning the positions of the bolt through holes 26 (round holes) of the connecting flanges 20 and 20 of the side plate 12 and the bolt through holes 46 of the scales 34 and 36. The nut 52 is loosely screwed through the washer 50 into the bolt 48 protruding to the opposite side (outside the accommodation space 40). Note that the bolt through holes 46 of the scales 34 and 36 are formed as elongated oblong holes so that they can be aligned with the bolt through holes 26 of the connecting flange 20 even if there is an error in the curved state of the side plate 12. . The bolt 48 is a dedicated product having a rotation stop plate 48a fixed to the head. Attachment of the side plate 12 to the scales 34 and 36 by the bolts 48 (supports) and nuts 52 (supports) is performed on all the columns 44 of the scales 34 and 36 for the first (lowermost) side plate 12. The second and subsequent side plates 12 are applied to all the columns 44 except for the columns 44 on the left and right sides of the right and left ends of the scales 34-1, 34-5, 36-1, and 36-5.

  When the loose attachment of the first side plate 12 to the scales 34 and 36 is completed, the second and subsequent side plates 12 are sequentially housed in the accommodation space 40 and loosely attached to the scales 34 and 36 in the same manner. Is called. However, if the side plate 12 is laminated on the side plate 12 as it is, four scheduled cutting positions 55 (55-1, 55-2, 55-3, 55-4) in the longitudinal direction of the side plate 12 (FIGS. 1A, 1B, 6A), the first scheduled cutting position 55-1 (the center position of the gap 42-1 between the scales 34-1 and 36-1 and the scales 34-2 and 36-2) and the last scheduled cutting. The gap 54 between the side plates 12 of each layer becomes too narrow at the point 55-4 (the central position of the gap 42-4 between the scales 34-4 and 36-4 and the scales 34-5 and 36-5). As a result, the band saw blade (saw blade) in the middle of cutting the upper side plate 12 starts to hit the lower side plate 12, and the blade comes off from the wheel (pulley) that rotates the blade, or the side plate 12 is inclined. Problems such as cutting (the cut surface becomes an inclined surface) occur. Therefore, when the loose attachment of the first side plate 12 is completed, an appropriate number of side plate spacers 56 made of steel plates having an appropriate thickness are arranged on the side plate 12 at both ends in the longitudinal direction, and the second layer Both ends of the side plate 12 in the longitudinal direction are placed and supported on the side plate spacer 56, and in this state, the second side plate 12 is loosely attached to the scales 34 and 36 with bolts 48 and nuts 52. Similarly, for the side plates 12 in the third and subsequent layers, the side plates 12 are stacked on the side plate spacers 56 at both sides in the longitudinal direction, and are loosely attached to the scales 34 and 36 with bolts 48 and nuts 52. By interposing the side plate spacers 56 between the respective layers, the gap 54 between the side plates 12 of each layer is sufficiently ensured at the first scheduled cutting location 55-1 and the final scheduled cutting location 55-4, and the upper side plate 12 is secured. Is completely cut, the lower side plate 12 starts to be cut, and smooth cutting is performed. Since the side plates 12 of each layer are curved in the longitudinal direction with the same curvature (for example, 12 meters in diameter), when stacked, the gap 54 between the side plates 12 of each layer is narrow at both ends in the longitudinal direction and wide at the center. . Therefore, if the gap 54 having a sufficient gap length is secured at the first scheduled cutting site 55-1 and the last scheduled cutting site 55-4 by the side plate spacer 56, the other scheduled cutting sites 55-2 and 55-3. In addition, a gap 54 having a sufficient gap length (that is, a gap length at which cutting of the lower side plate 12 is started after the upper side plate 12 is completely cut) is secured. Even if the upper side plate 12 is placed directly on the lower side plate 12 without biting the side plate spacer 56 at the first scheduled cutting location 55-1 and the final scheduled cutting location 55-4, a sufficient gap length is obtained. If the gap 54 can be secured, the side plate spacers 56 can be dispensed with at all. When loose attachment of the side plates 12 of the respective layers to the scales 34 and 36 is finished, all the nuts 52 of the respective layers are finally tightened. When the nut 52 is fully tightened, the bolt 48 is prevented from rotating together by the rotation stop plate 48a (FIG. 5) attached to the head of the bolt 48. That is, when the bolt 48 tries to rotate by turning the nut 52, the rotation prevention plate 48 a comes into contact with the surface of the side plate 12 and prevents the bolt 48 from rotating. Thereby, when the nut 52 is finally tightened, an operation of stopping the rotation of the bolt 48 by inserting a tool into the narrow gap 54 between the side plates 12 of each layer is not necessary, and the final tightening operation of the nut 52 is facilitated. When all nuts 52 of each layer are finally tightened, the side plates 12 and the scales 34 and 36 are fixed and integrated as a side plate unit 58. In this state, the lower portions of the adjacent scales 34-1 to 34-5 and the lower portions of the adjacent scales 36-1 to 36-5 are connected to each other in a state of being stretched by the tension jack 60 (stretching member). When the unit 58 is lifted by a crane, the entire side plate unit 58 is prevented from being bent and deformed by its weight.

  FIG. 6A (front view), FIG. 6B (plan view), and FIG. 6C (side view) show the side plate unit 58 assembled on the temporary frame 28 by the above steps. FIG. 6D shows an enlarged view of part A of FIG. 6A. Since the tank side plate 12 may have different dimensions (for example, dimensions in the short direction) depending on the tank manufacturer even if the tank capacity is the same, prepare the scales 34 and 36 for each manufacturer with different dimensions of the tank side plate 12. It is convenient to leave. In addition, since the curvature of the tank side plate 12 is different when the tank capacity is different, it is convenient to prepare the dedicated scales 34 and 36 for each tank capacity. However, it is also possible to design a versatile scale that can be shared regardless of differences in side plate dimensions by tank manufacturers or differences in side plate curvature due to tank capacity.

(2) Transfer process (FIGS. 4F to 4G)
The assembled side plate unit 58 is removed from the temporary assembly base 28 and transferred to the slide table (work table) (base) of the cutting line 62. The structure of the cutting line 62 is shown in FIG. 7A (front view), FIG. 7B (plan view), and FIG. 7C (side view). The cutting line 62 has a rail 68 (LM guide) laid along a steel table frame 66 fixedly installed in a straight line on a floor 64. A steel slide table 70 is placed and supported on the rail 68 so as to be movable along the rail 68. The slide table 70 is electrically driven and moves along the rail 68 to the transfer stage 62-1, the cutting stage 62-2, and the carry-out stage 62-3. In the cutting stage 62-2, a large band saw 72 is fixedly installed on the floor 64 as a cutting machine. The band saw 72 uses a GANTRY type machine here. The band saw 72 is a horizontal band saw that causes the blade 78 to travel in the horizontal direction. The inclination angle of the blade 78 in the traveling direction can be finely adjusted with respect to the horizontal direction. By cutting the work piece (here, the side plate 12) by inclining the blade 78 somewhat in the traveling direction (with a slight angle with respect to the surface of the work piece), cutting is performed by cutting from one end side of the work piece. Can be started and cutting becomes easier. The band saw 72 includes struts 74 and 74 that are erected and fixed to the floor 64 with the table frame 66 sandwiched in the width direction, and a band saw lifting and lowering portion 76 that is movably mounted on the struts 74 and 74. A band saw lifting unit 76 is installed across the table frame 66. A blade 78 extends in the width direction of the table frame 66 and is disposed in a substantially horizontal posture at the lower portion of the band saw lifting and lowering unit 76. By lowering the band saw lifting and lowering portion 76 while running the blade 78, it is possible to cut the workpiece placed on the slide table 70 at the position immediately below it.

  The transfer process will be described. When the side plate unit 58 is assembled as shown in FIG. 6 (A, B, C), all the bolts 38 fixing the scales 34, 36 to the temporary frame 28 are removed. As a result, the fixing of the side plate unit 58 to the temporary frame 28 is released. Next, the side plate unit 58 is lifted by a crane.

<< Figure 4F >>
The slide table 70 of the cutting line 62 is arranged on the transfer stage 62-1. The wire rope 39 is hung on the side plate unit 58 completed on the temporary assembly stage, and is lifted by the hook 41 of the crane. The lifted side plate unit 58 is lowered onto the slide table 70. On the both sides in the longitudinal direction of the slide table 70, a total of four positioning scales 80 of the same structure with a width for positioning the longitudinal direction of the side plate unit 58 are arranged opposite to each side, and bolts 82 are attached to the slide table 70. It is fixed. Like the positioning scale 30 of the temporary frame 28, the positioning scale 80 is made of steel and is configured in a frame shape with a right triangle. The bolt through hole 80a (FIG. 1B) of the positioning scale 80 is a long hole that is long in the facing direction of the positioning scale 80, so that the opposing positioning scale 80 can be fixed to the slide table 70 by finely adjusting the respective positions. . The positioning scale adjustment jig 81 performs this fine adjustment. By finely adjusting the position of the positioning scale 80, the distance between the opposing positioning scales 80 can be finely adjusted on the slide table 70 so that the longitudinal direction of the side plate unit 58 can be positioned almost without backlash. Further, a steel plate 83 is fixed to the upper surface of the slide table 70 by bolts (not shown) at places where the left and right ends of the side plate unit 58 are placed and supported. On the upper surface of the slide table 70, a number of tapped holes for screwing bolts 82 for fixing the positioning scales 80, bolts for fixing the base plate 83, bolts 84 for fixing the scales 34 and 36 (FIG. 4G), etc. are formed at predetermined vertical and horizontal pitches. Has been. The side plate unit 58 is positioned on the positioning levers 80 on both the left and right sides and is lowered onto the slide table 70, and the lower portions at both ends in the longitudinal direction are abutted and supported on the floor plate 83.

<< Figure 4G >>
All the scales 34 and 36 of the side plate unit 58 are fixed to the slide table 70 with bolts 84. You are now ready for cutting. FIG. 1A (front view) and FIG. 1B (plan view) show the side plate unit 58 transferred onto the slide table 70 by the above steps. The side plate unit 58 of FIG. 1A shows a case where the side plate 12 is laminated in four layers. A gap 54 is formed between the side plates 12 of each layer. In FIG. 1A, the left and right central portions of the side plate 12 are shown hatched so that the side plate 12 and the gap 54 can be easily distinguished. The gap length of the gap 54 is the gap length at which the blade 78 does not hit the lower side plate 12 at the location where the cutting of the side plate 12 is finished during the cutting of the upper side plate 12 at any of the scheduled cutting points 55. Set to.

(3) Cutting process (Fig. 4H)
The slide table 70 is transferred toward the cutting stage 62-2, and the central position of the gap 42-1 which is the first scheduled cutting position 55-1 is positioned at a position directly below the blade 78 of the band saw 72. In this state, while the blade 78 is traveling (turning around), the band saw lifting and lowering portion 76 is sequentially lowered to translate the position of the blade 78 in the stacking direction of the side plates 12 to cut the first scheduled cutting portion 55-1. Do. In order to facilitate cutting, the blade 78 is cut in a posture in which the blade 78 is slightly inclined in the traveling direction with respect to the surface of the side plate 12. At this time, since the gap 54 is formed between the side plates 12 of each layer, the blade 78 is prevented from hitting the next (immediately below) side plate 12 while cutting one side plate 12. After the side plate 12 is completely cut, the next side plate 12 is cut. In this way, even if the blade 78 is continuously lowered, the side plates 12 are cut separately one by one, so that the cutting can proceed smoothly. When the cutting of all the side plates 12 is completed at the first scheduled cutting location 55-1, the band saw lifting / lowering unit 76 is raised, the blade 78 is extracted from the side plate unit 58, and retracted above the side plate unit 58. Next, the slide table 70 is transferred in the same direction as described above, and the center position of the gap 42-2, which is the second scheduled cutting position 55-2, is positioned directly below the blade 78 of the band saw 72. In this state, the cutting of the planned cutting location 55-2 is continuously performed. Further, the slide table 70 is transferred to the center position of the gap 42-3 as the third scheduled cutting position 55-3, and the center position of the gap 42-4 as the fourth (last) scheduled cutting position 55-4. Are sequentially cut. This completes the cutting of all scheduled cutting points 55, and the side plate unit 58 is divided into five cutting blocks 58-1 to 58-5 in the longitudinal direction.

(4) Unloading process When the cutting of all the scheduled cutting points 55 is completed, the slide table 70 is transferred to the unloading stage 62-3. In the carry-out stage 62-3, all the bolts 84 fixing the scales 34, 36 to the slide table 70 are removed. As a result, the cutting blocks 58-1 to 58-5 are released from being fixed to the slide table 70. Since the cutting blocks 58-1 to 58-5 are separated from each other by cutting, the cutting blocks 58-1 to 58-5 can be carried out. Therefore, each of the cutting blocks 58-1 to 58-5 is lifted by a crane and carried to a removal stage adjacent to the cutting line 62. In the above description, the cutting blocks 58-1 to 58-5 are carried out after the cutting of all the planned cutting points 55 has been completed, but instead, the cutting of one planned cutting point 55 is cut. When the process is finished, the cutting block cut out by the cutting can be carried out, and the cutting and the cutting block cut out by the cutting can be carried out alternately.

(5) Removal process (FIGS. 4I to 4M)
Steel removal racks 86, 88, and 90 shown in FIGS. 8, 9, and 10 (A, B) are installed on the removal stage. These detaching stands 86, 88, 90 support the respective cut pieces 12a (small pieces formed by cutting the side plate 12) of the cutting blocks 58-1 to 58-5, and without dropping the respective cut pieces 12a. In the supported state, the bolts 48 and nuts 52 (FIG. 5) fixing the scales 34 and 36 and the cut pieces 12a are removed, and the cutting blocks 58-1 to 58-5 are connected to the individual scales 34 and 36 and the individual pieces. The cut piece 12a is separated and can be removed. 8 is for the first cutting block 58-1 and the fifth cutting block 58-5, and the detaching rack 88 of FIG. 9 is for the second cutting block 58-2 and the fourth cutting block 58-4. Yes, the removal stand 90 of FIGS. 10A and 10B is for the third cutting and cutting block 58-3. Each detachment base 86, 88, 90 has a pedestal 92 and four columns 94 that are erected and fixed to the pedestal 92. A plurality of receiving metal fittings 96 that receive and support each of the cut pieces 12a of the side plate 12 are arranged on the support column 94 in the height direction, and are supported so as to be slidable in the horizontal direction. However, since the cut pieces 12a of the cutting blocks 58-1 and 58-5 are directly laminated and supported by the cut pieces 12a of the respective layers with the side plate spacer 56 (FIG. 6D) interposed therebetween, the cutting block 58- of FIG. The support brackets 96 are not provided on the two support posts 94 on the lower side of the removal stand 86 for 1,58-5. Next to the divided stands 86, 88, 90, work tables 97 having various heights on which workers can work are placed.

4I-4M show the removal process for cutting block 58-2. Each process of the removal process will be described.
<< FIGS. 4I to 4J >>
When the cutting block 58-2 is removed and lowered onto the pedestal 88, the receiving metal fitting 96 of the detaching pedestal 88 is slid in the outward direction and retracted in advance. The wire rope 39 is hung on the cutting block 58-2 by the unloading stage 62-3 (FIGS. 7A and 7B) of the slide table 70, and is lifted by the hook 41 of the crane. The lifted cutting block 58-2 (FIG. 4I) is removed and lowered onto the pedestal 92 of the pedestal 88 (FIG. 4J).

<< Figure 4K >>
Each receiving metal piece 96 is slid inwardly to enter the gap 54 between each cutting piece 12a and the lower space of the lowermost cutting piece 12a, and each cutting piece 12a is supported by each receiving metal piece 96. After the support, the bolt 98 that slidably supports the receiving metal 96 is tightened to fix the receiving metal 96 to the support column 94 so that the receiving metal 96 does not return to the retracted position.

<< Figure 4L >>
All the bolts 48 and nuts 52 that connect and fix the scales 34-2 and 36-2 and the cut piece 12a are removed, the scales 34-2 and 36-2 are removed, and the racks 88 are pulled out. As a result, each of the cut pieces 12a is in contact with and supported by the column 94 of the detachable mount 88 and the receiving metal 96.

<< Figure 4M >>
Hang the wire rope 39 on the bolt through hole 26 one by one from the top of the cutting piece 12a, lift it with the hook 41 of the crane, remove it from the pedestal 88, transfer it to a predetermined position and lower it. Each time one piece 12a is carried out, the bolt 98 holding the receiving piece 96 is loosened, the receiving piece 96 is slid outward, and the lower piece 12a is lifted so that it can be carried out.

  In the above embodiment, the gap between the metal plate members is configured as a space. However, the metal plate member is formed with a gap between the metal plate members with the other member interposed therebetween, and the metal plate The load of the plate member can be supported, and the metal member can be cut with the other members. In this case, if a member having a lower hardness than a metal plate member such as wood is used as another member, even if the blade hits the other member and starts cutting while cutting one metal plate member, the cutting is performed. The cutting of the metal plate member being cut can be smoothly advanced without greatly affecting the cutting of the metal plate member on the way. Moreover, in the said embodiment, although the metal plate member was laminated | stacked up and down and cut | disconnected, it can also cut | disconnect by laminating | stacking a metal plate member sideways. In this case, a vertical band saw that allows the blade to run in the vertical direction can be used. Moreover, although the case where this invention was used for the cutting | disconnection of the side plate of a cylindrical assembly-type tank was demonstrated in the said embodiment, this invention can be used for the cutting | disconnection of the side plate of a rectangular tank, and other various metal plate members. .

  DESCRIPTION OF SYMBOLS 10 ... Cylindrical assembling type tank, 12 ... Side plate (tank side plate, metal plate member), 12a ... Cut piece, 14 ... Side wall, 16 ... Cylinder, 18 ... Connection flange, 20 ... Connection flange, 22 ... Bolt through hole (connection) Holes), 24 ... reinforcing ribs, 26 ... bolt through-holes (connection holes), 28 ... temporary frame, 30 ... positioning scale (pair of jigs in the second direction), 30a ... bolt through-holes, 31 ... positioning scale adjustment Jig, 32 ... bolt, 33 ... laying plate, 34 (34-1, 34-2, 34-3, 34-4, 34-5) ... equal (jig, jig pair in the first direction), 36 ( 36-1, 36-2, 36-3, 36-4, 36-5) ... Ecale (jig, jig pair in the first direction), 36a ... side plate guide column, 38 ... bolt, 39 ... wire rope, 40 ... accommodating space, 41 ... crane hook, 42 (42-1, 4) -2, 42-3, 42-4) ... Gap, 44 ... Support, 46 ... Bolt through hole (connection hole), 48 ... Bolt (support), 48a ... Rotation stop plate, 50 ... Washer, 52 ... Nut ( Supports), 54 ... Gap, 55 (55-1, 55-2, 55-3, 55-4) ... Scheduled cut place, 56 ... Side plate spacer, 58 ... Side plate unit, 58-1, 58-2, 58 -3, 58-4, 58-5 ... cutting block, 60 ... tension jack (stretching member), 62 ... cutting line, 62-1 ... transfer stage, 62-2 ... cutting stage, 62-3 ... unloading stage, 64 ... Floor, 66 ... Table frame, 68 ... Rail, 70 ... Slide table (work table, foundation), 72 ... Band saw (cutting machine), 74 ... Strut, 76 ... Band saw lift, 78 ... Blade, 80 ... Positioning , 80a ... Bolt through hole, 81 ... Positioning scale adjusting jig, 82 ... Bolt, 83 ... Base plate, 84 ... Bolt, 86, 88, 90 ... Detachment base, 92 ... Base, 94 ... Post, 96 ... Bracket, 97 ... Workbench, 98 ... Bolt

Claims (5)

In a method of cutting and disassembling a plurality of metal plate members with a band saw,
In the method, the plurality of metal plate members are arranged in a stacked manner by forming a gap between the metal plate members at a planned cutting position, and the band saw blade is disposed facing the surface of the metal plate member. The metal plate member is moved relative to the stacking direction of the metal plate member and the metal plate member is sequentially cut at the planned cutting position.
The gap length of the gap is set so that the blade does not hit the metal plate member to be cut next while the blade cuts one metal plate member. Method. The method for laminating, cutting and disassembling a metal plate member according to claim 1, wherein a side plate spacer is sandwiched between the metal plate members to form a necessary gap length of the gap. The method of laminating, cutting and disassembling a metal plate member according to claim 1 or 2, wherein the cutting is performed in a state in which a jig is arranged oppositely and the plurality of metal plate members are respectively supported by the opposing jig. The method
In a state where the jig is opposed and fixed to the temporary assembly base, the plurality of metal plate members are fixed and assembled to the jig, and the jig is detached from the temporary assembly base in the assembled state. The assembled jig and the metal plate member are pulled up from the temporary assembly base and transferred to a work table, the jig is fixed to the work table, the work table and the band saw are moved relative to each other, It is a method of positioning the planned cutting position on the band saw and cutting the metal plate member, and
The jigs adjacent to each other across the planned cutting position of the metal plate member can be separated from each other,
Such a method in which the assembled jig and the metal plate member are pulled up from the temporary assembly base and transferred to the work table in a state where the adjacent jigs are stretched and connected by a stretching member. The method of laminating, cutting and disassembling a metal plate member according to claim 1 or 2, wherein the cutting is performed in a state in which a jig is arranged oppositely and the plurality of metal plate members are respectively supported by the opposing jig. The method
In a state where the jig is opposed and fixed to the temporary assembly base, the plurality of metal plate members are fixed and assembled to the jig, and the jig is detached from the temporary assembly base in the assembled state. The assembled jig and the metal plate member are pulled up from the temporary assembly base and transferred to a work table, the jig is fixed to the work table, the work table and the band saw are moved relative to each other, It is a method of positioning the planned cutting position on the band saw and cutting the metal plate member, and
The jigs adjacent to each other across the planned cutting position of the metal plate member are supported by the work table so as to be separable from each other,
While supporting the cut piece of the metal plate member on the jig, the jig is removed from the work table and transferred,
Such a method in which the cut piece is removed from the jig at the transfer destination. The method of removing the cut piece from the jig at the transfer destination,
Using a detachment stand with a bracket,
5. The metal according to claim 4, wherein the receiving piece is inserted into the gap between the cut pieces, and the cut piece is removed from the jig in a state where the cut piece is received and supported by the receiving piece. A method of laminating, cutting and disassembling plate members.

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