JP6281457B2 - Bend tube packing structure and packing method - Google Patents

Description

  The present invention relates to a packing structure and a packing method for storing bent pipes having the same pitch stacked in a plurality of stages in the vertical direction and storing them in order from the longest to the inner side. More specifically, the present invention relates to a bend tube packing structure that can reduce damage and prevent deformation of the bend tube during packing and removal, and a packing method thereof.

  In a nuclear power plant, a steam generator is installed, and a bend pipe is used as the heat transfer pipe for the steam generator. As the bend pipe, there are a U-bend pipe and a double bend pipe. The U-bend tube has a U-shape bent at one place, and includes leg portions (straight line portions) that include both end portions and are parallel to each other, and a curved portion that connects the leg portions. Such an interval between the leg portions of the U-bend tube is called a pitch. On the other hand, the double-bend pipe has a U-shape bent at two locations, and includes leg portions (straight portions) that are parallel to each other, including both ends, and an intermediate portion that bends 90 ° from these leg portions and connects the legs. And a straight portion. The spacing between the legs of the double bend tube is also called the pitch.

  In a steam generator using a double bend pipe, bend pipes having different pitches are arranged side by side in a state in which the bending planes are matched from the inside to the outside in order from the short pitch. For example, when the outer diameter of the double bend pipe is about 19 mm, the pitch is about 500 to 5000 mm, and the distance between the axial centers of the inner and outer double bend pipes is about 25 mm. In this way, a plurality of bend tube rows arranged from the inside to the outside in the order of short pitches are further arranged in a direction perpendicular to the bending plane.

  In such a steam generator using a double bend pipe, a U bend pipe may be used for a part of the inside.

  On the other hand, the bend pipe is manufactured by obtaining a straight straight pipe at a manufacturing factory and bending the straight pipe. Thus, the bend pipe produced in the manufacturing factory is once packaged and shipped, and transported to the steam generator assembly factory.

  In the case of a steam generator using a double bend pipe, the bend pipe is assembled to the steam generator in an assembly factory by repeating the following extraction operation and installation operation. In the take-out operation, a predetermined number of bend pipes having the same pitch are taken out from the package. In the installation work, the extracted bend pipe is inserted into the pipe support plate of the steam generator in order and installed. For this reason, in the packaging of the bend pipes, it is necessary to store the bend pipes having the same pitch so that they can be taken out every predetermined number when assembled.

  Various proposals have been made regarding the packaging of tubes. For example, Patent Document 1 is available. Patent Document 1 is directed to a cladding tube with a lower end plug for nuclear fuel. The packing structure consists of a plurality of nuclear fuel cladding tubes arranged horizontally in a box-shaped container and stacked and stored in a plurality of stages in the vertical direction, and the stored nuclear fuel cladding tubes and containers. Insert the packing material between the two. In such a packing structure, it has been proposed to provide a regulating means that regulates the movement of the nuclear fuel cladding tube in the axial direction by engaging with the groove on the lower end plug side of the nuclear fuel cladding tube.

  Accordingly, it is possible to prevent chips from being generated by cutting the packing material at the corners of the upper opening end due to vibration during transportation, and entering the nuclear fuel cladding tube as foreign matter. In Patent Document 1, a corrugated sheet for stacking is arranged between nuclear fuel cladding tubes stacked in a plurality of stages, and a plurality of cladding tubes for nuclear fuel are arranged in the horizontal direction on the corrugated sheet for stacking. Books are placed side by side.

JP 2007-218835 A

  As described above, in the case of a steam generator using a double bend pipe, it is necessary to store and package the bend pipes having the same pitch at the time of assembly in a state where they can be taken out for each predetermined number.

  1A and 1B are schematic views showing a conventional bend pipe packaging structure, in which FIG. 1A is a top view and FIG. 1B is a cross-sectional view taken along line AA. The packaging structure shown in the figure covers a double bend pipe among the bend pipes. The figure shows a box-shaped container 13, a lid 14, a mounting stopper 11, an upper stopper 12, a spacer 31, and a double bend pipe 41 accommodated therein. In order to facilitate understanding of the packing structure, the lid 14 is not shown in FIG.

  The box-shaped container 13 is a wooden box having an open top. The opening is covered with a wooden lid 14 (see FIG. 5B). In addition, a sheet-like cover (not shown) is disposed inside the container 13 and the lid 14, thereby preventing rainwater and the like from being mixed and adhering to the double bend pipe 41 during transportation. As the sheet-like cover, a resin sheet (for example, a polyethylene sheet) can be used.

  The placement stoppers 11 are formed of rectangular parallelepiped wood pieces, and a plurality of placement stoppers 11 are arranged along the longitudinal direction for placing the stacked double bend pipes. In FIG. 2A, a plurality of upper stoppers 12 to be described later are arranged along the longitudinal direction of the double bend pipe, and a placement stopper 11 is arranged directly below the upper stopper 12. In order to store a plurality of stacked double bend pipes in the vertical direction, a plurality of mounting stoppers 11 are further arranged in the vertical direction (see FIG. 5B). Further, in order to accommodate the double bend pipes in order from the outside in order from the longest pitch, a plurality of placement stoppers 11 are further arranged from the outside to the inside.

  The outermost mounting stopper 11 is fixed (for example, screwed) to the box-shaped container 13. Other mounting stoppers 11 are fixed to the box-shaped container 13 through the outer mounting stopper 11 by being fixed to the outer mounting stopper 11. Double bend pipes 41 stacked in a predetermined number of stages (six stages in the figure) are placed on the placement stopper 11.

  Above the uppermost double bend pipe 41 among the double bend pipes 41 that are stored side by side in the vertical direction, a plurality of upper stoppers 12 are arranged along the longitudinal direction of the double bend pipe. The outermost upper stopper 12 is fixed (for example, screwed) to the box-shaped container 13. The other upper stoppers 12 are fixed to the box-shaped container 13 via the outer upper stopper 12 by being fixed to the outer upper stopper 12.

  In order to prevent the double bend pipes stacked from coming into contact with each other and being damaged, the double bend pipes 41 are stacked with a concave clip (not shown) interposed therebetween. This clip is made of, for example, resin, and has an intermediate portion and side portions extending from both sides of the intermediate portion in the width direction. The intermediate part is in contact with the pipe to which the lower surface is attached, and the pipe stacked on the upper surface is placed thereon.

  In order to partition between the double bend pipe 41 stacked on the inner side and the double bend pipe 41 stacked on the outer side, a thin wooden spacer 31 is arranged. Further, in the same figure, a wooden spacer 31 is arranged to partition between the double bend pipe 41 and the container 13 stacked on the outermost side. A wooden spacer 31 is arranged to separate the double bend pipe 41 stacked on the innermost side from the inner space. The spacer 31 arranged in this way is placed on the upper side from the lower placement stopper 11 via the stacked double bend pipes 41 placed on the placement stopper 11. 11 or the upper stopper 12 is extended. For this reason, a plurality of spacers 31 are arranged in the vertical direction, and the upper and lower portions thereof are fixed to the mounting stopper 11 and the upper stopper 12, respectively.

  Next, a method for storing and packing the double bend pipe with the above-described structure will be described.

  FIG. 2 is a cross-sectional view schematically showing a conventional packing method. FIG. 2A is a procedure for arranging a cover, FIG. 2B is a procedure for fixing a lower portion of a spacer, and FIG. The procedure for carrying in the stacked bend pipes, FIG. 4D shows the procedure for fixing the mounting stopper, and FIG. 4E shows the procedure for fixing another spacer. These figures correspond to the AA cross section of FIG. In FIG. 2A, the sheet-like cover 15 is indicated by a thick line, and in FIG. 1B to FIG.

  When packing the double bend pipe, the inner surface of the box-shaped container 13 is covered with a sheet-like cover 15 and the spacer 31 is fixed to the container 13 as shown in FIG. A plurality of spacers 31 are arranged in the vertical direction, and a plurality of spacers 31 are arranged along the longitudinal direction of the double bend pipe to be accommodated. The portion of the cover 15 located outside the container is folded after all the double bend pipes are accommodated, and covers the upper portion of the double bend pipe that is disposed and accommodated between the upper stopper and the lid.

  Then, the work which continues packing a double bend pipe with the same pitch is performed. In this operation, first, as shown in FIG. 4B, the placement stopper 11 is fixed to the container 13 together with the lower portion of the spacer 31 arranged inside thereof. A plurality of placement stoppers 11 and spacers 31 on the inside are arranged along the longitudinal direction of the double bend pipe to be accommodated.

  The double bend pipe 41 stacked as shown in FIG. 4C is placed on the fixed placement stopper 11. This carrying-in operation can be performed by carrying in a double bend pipe 41 stacked in a suspended state by a crane or the like from above the container 13 and placing it on the placing stopper 11.

  As shown in FIG. 4D, another mounting stopper 11 is arranged above the stacked double bend pipes 41, and the upper portion of the spacer 31 is fixed together with the mounting stopper 11. A plurality of placement stoppers 11 are arranged along the longitudinal direction of the double bend pipe to be accommodated, and the upper portion of the spacer 31 is fixed to each.

  Next, the stacked double bend pipes are placed and stored in the placement stopper 11 fixed in the procedure of FIG. Specifically, as shown in FIG. 5E, after fixing the lower portion of the spacer 31 to the mounting stopper 11 on which the double bend pipe is placed, the same steps as in the above-described FIG. The stacked double bend pipe 41 is placed, and then the upper portion of the spacer 31 is fixed together with the placing stopper 11 in the same manner as in the procedure of FIG. By repeating such a procedure, double bend pipes having the same pitch are continuously stored and packed.

  In this way, by fixing the upper stopper in a state where the double bend pipe is accommodated up to the uppermost stage, the work of continuously packing the double bend pipe having the same pitch is completed. The operation of continuously packing the double bend pipes having the same pitch is repeated in order from the outside to the inside, that is, in order from the long double bend pipe. Thereafter, the portion of the cover 15 located outside the container is folded back to cover the upper stopper and the like, and the lid is put on. As a result, the packaging structure as shown in FIG. 1 is completed.

  On the other hand, the operation of taking out the double bend pipe when assembling the bend pipe to the steam generator is as follows. When removing the double bend pipe, the upper stopper located above the innermost and uppermost double bend pipe is removed. The double bend pipes stacked near the lower stopper are lifted by a crane or the like and carried out from above.

  The work of removing the placement stopper 11 on which the double bend pipes that have been carried out are placed and the work of carrying out the double bend pipes stacked in a predetermined number of stages are repeated. As a result, double bend pipes having the same pitch are successively taken out every predetermined number.

  Next, the double bend pipes that are adjacent to the taken out double bend pipes are taken out for every predetermined number in the same procedure. Further, the double-bend pipes having the same pitch are taken out in order from the inside to the outside, whereby all the packed pipes are taken out.

  In such a conventional packing structure, a plurality of spacers 31 are arranged in the vertical direction. In this case, if it arrange | positions without providing a clearance gap between the spacers 31 arranged in an up-down direction, one part spacer cannot be arrange | positioned by the positional deviation resulting from the dimensional dispersion | variation resulting from the processing precision of the spacer 31, and an assembly precision. For this reason, a gap is provided between the spacers 31 to absorb a dimensional variation caused by processing accuracy and a positional deviation caused by assembly accuracy.

  However, if there is a gap between the spacers 31, the stacked double bend pipes are easily caught in the gap between the spacers in the operation of carrying in the double bend pipes stacked at the time of packing. The catch in the gap between the spacers of the double bend pipe is likely to occur even in the work of carrying out the double bend pipes stacked when assembled to the steam generator. When the catch occurs, the double bend pipe being stored or taken out may be deformed to cause a product defect.

  If a plurality of spacers 31 are arranged in the vertical direction, it is necessary to fix the upper and lower portions of each spacer 31 by screwing or the like. At that time, the screws cannot be tightened in a horizontal state, and if the screws are tightened at an angle, the outer surface of the double bend pipe may come into contact with the screw and the double bend pipe may be damaged and damaged, resulting in product defects. Further, from the viewpoint of improving working efficiency, it is desired to reduce the number of screws required for fixing the spacer.

  Furthermore, when the double bend pipes stacked between the plurality of placement stoppers arranged in the vertical direction and between the upper stopper and the placement stopper are stored, the double bend pipes are placed above the stacked double bend pipes. A gap is created. In this case, the double bend pipe 41 may vibrate due to vibration during transportation and the double bend pipe 41 may be deformed.

  In Patent Document 1 described above, a packaging structure of a cladding tube with a lower end plug for nuclear fuel is proposed, but when stacking in a plurality of stages in the vertical direction, the coating for nuclear fuel stacked in a plurality of stages is proposed. Corrugated plates for stacking are arranged between the tubes, and a plurality of cladding tubes for nuclear fuel are placed side by side on the stacked corrugated plates. For this reason, the pipes stacked in the vertical direction cannot be continuously taken out.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a bend pipe packing structure and a packing method capable of reducing damage to the bend pipe at the time of packing or taking out and preventing deformation. To do.

  The packaging structure according to an embodiment of the present invention is a packaging in which bend pipes having the same pitch are stacked and stored in a plurality of stages in the vertical direction, and the pipes are stored from the outside in the order from the longest pitch. It is a structure. The packing structure includes a placement stopper, an upper stopper, a spacer, a first cushioning material, a second cushioning material, a third cushioning material, and a support column. A plurality of the placement stoppers are arranged along the longitudinal direction of the bend pipe, and further arranged in the vertical direction and from the outside to the inside, and the bends stacked in a predetermined number of stages. A tube is placed. A plurality of the upper stoppers are arranged along the longitudinal direction of the bend pipe, and are further arranged from the outside toward the inside, and are positioned above the uppermost bend pipe. The spacer is disposed between the bend pipes adjacent to each other on the outer side and the inner side, and extends from the placement stopper disposed at the lowest position to the upper stopper. The first cushioning material is interposed between the mounting stopper and the bend pipe that is stored at a position immediately above and closest to the mounting stopper. The second cushioning material is interposed between the mounting stopper and the bend pipe stored at a position immediately below and closest to the mounting stopper. The third cushioning material is interposed between the upper stopper and the bend pipe stored at a position directly below and closest to the upper stopper. A plurality of the struts are arranged along the longitudinal direction on the outside of the bend pipe having the maximum pitch, and the placement stopper, the top stopper, and the spacer are fixed.

  The outermost placement stopper among the placement stoppers described above is fixed to the column, and the placement stopper inside the outermost placement stopper is located outside the placement stopper. It is preferable to fix to the said support | pillar by fixing to the other stopper for said mounting adjacent via a spacer.

  The mounting stopper is screwed to another mounting stopper or the column, which is adjacent to the mounting stopper and the spacer on the outside through the spacer, together with the spacer arranged inside the mounting stopper. The mounting stopper has at least four pilot holes for screwing, and the pilot hole used for fixing the mounting stopper has the spacer on the outside with the mounting stopper. It is preferable that it is the said pilot hole of the position which is not used for fixation of another said mounting stopper adjacent through this.

  A packaging method according to an embodiment of the present invention is a method of packaging a bend pipe by the above-described packaging structure, wherein the pitch is the same by repeating the process of packaging the bend pipe stacked in a plurality of stages in the vertical direction. Including successively packing the bend pipes, and the steps are repeated in order from the longest pitch of the bend pipes.

The bend tube packing structure and packing method of the present invention have the following remarkable effects.
(1) A spacer disposed between the bend pipes adjacent to each other on the outer side and the inner side extends from the mounting stopper disposed at the lowest position to the upper stopper.
(2) According to the above (1), since no gap is generated, the bend pipe is not caught in the gap during carry-in work or carry-out work, and deformation of the bend pipe can be prevented.
(3) Further, according to the above (1), the number of places such as screwing can be reduced when fixing the mounting stopper arranged in the middle of the spacer, so that the bend pipe can be damaged and the work efficiency can be reduced. Can be improved.

It is a schematic diagram which shows the packaging structure of the conventional bend pipe | tube, The figure (a) is a top view, The figure (b) is AA sectional drawing. It is sectional drawing which shows the conventional packing method typically, The figure (a) is the procedure which arrange | positions a cover, The figure (b) is the procedure which fixes the lower part of a spacer, The figure (c) was stacked. The procedure for carrying in the bend pipe, FIG. 4D shows the procedure for fixing the mounting stopper, and FIG. 4E shows the procedure for fixing another spacer. It is a schematic diagram which shows the structural example of the packing structure of the bend pipe | tube of this invention, The figure (a) is a top view, The figure (b) is BB sectional drawing. It is a schematic diagram which shows the arrangement | positioning position of the mounting hole of a mounting stopper, and a usage location, The figure (a) shows the N-1th mounting stopper from the outside, The figure (b) shows N from the outside. The second mounting stopper is shown. It is sectional drawing which shows the example of a procedure of the packing method of this invention typically, The figure (a) is the procedure which arrange | positions a cover, The figure (b) is the procedure which fixes the lower part of a spacer, The figure (c) is The procedure for carrying in the stacked bend pipes and FIG. 4D show the procedure for fixing the mounting stopper.

  The bend pipe packaging structure of the present invention will be described below with reference to the drawings.

  3A and 3B are schematic views showing a configuration example of a packing structure for a bend pipe according to the present invention. FIG. 3A is a top view, and FIG. The figure shows a column 16, a lower frame 17, a floor panel 18, a mounting stopper 11, an upper stopper 12, a spacer 32, an exterior panel 19, a lid 14, and a first cushioning material. 21, a second buffer material 22, a third buffer material 23, an inner pressing plate 20, a cover pressing plate 24, and a double bend pipe 41 to be housed. In order to facilitate understanding of the packing structure, the lid 14 is not shown in FIG.

  The lower frame 17 is the bottom of the packaging structure. The lower frame 17 of the packing structure shown in the figure is made of a shape steel or the like, and has an outer frame and a beam provided inside the outer frame. A floor panel 18 is fixed on the lower frame. The floor panel can be composed of, for example, plywood.

  A support 16 is fixed to the lower frame 17. The support column 16 is disposed outside the double bend pipe 41 having the largest pitch among the double bend pipes 41 accommodated, that is, outside the double bend pipe 41 accommodated at the outermost position. A plurality of the columns 16 are arranged along the longitudinal direction of the double bend pipe 41 having the maximum pitch. This support | pillar 16 can be comprised, for example with a metal material, and can be comprised with a shape steel more specifically.

  A sheet-like cover (not shown) is disposed inside the support column 16, the floor panel 18, and the lid 14. A portion of the sheet-like cover located inside the support column 16 is fixed using the cover pressing plate 24. Specifically, a cover is disposed between the support column 16 and the cover pressing plate 24 disposed inside thereof, and the cover pressing plate 24 is fixed to the support column 16. Accordingly, the cover is sandwiched and fixed between the support column 16 and the cover pressing plate 24.

  The cover holding plate 24 plays a role of partitioning between the double bend pipe 41 stacked on the outermost side and the support column 16, and the double bend pipe 41 is outside during transportation, packing, and assembling (when taking out). To move to. Further, the cover pressing plate 24 extends from the placement stopper 11 arranged at the lowest position to the upper stopper 12.

  A plurality of placement stoppers 11 are arranged along the longitudinal direction of the double bend pipe 41, and further, a plurality of placement stoppers 11 are arranged in the vertical direction and are arranged from the outside toward the inside. In FIG. 2A, a plurality of upper stoppers 12 to be described later are arranged along the longitudinal direction of the double bend pipe, and a placement stopper 11 is arranged directly below the upper stopper 12.

  The outermost mounting stopper 11 is fixed (for example, screwed) to the column 16. The other mounting stoppers 11 are fixed to the support column 16 via the outer mounting stopper 11 by being fixed to the outer mounting stopper 11. Double bend pipes 41 stacked in a predetermined number of stages (six stages in the figure) are respectively placed on the placement stopper 11. The placement stopper 11 can be formed of a rectangular parallelepiped piece of wood.

  In this way, by placing the double bend pipes 41 stacked in a predetermined number of stages on the placement stoppers 11 arranged in the vertical direction, the double bend pipes 41 are stored side by side in the vertical direction. A plurality of upper stoppers 12 are arranged above the uppermost double bend pipe 41 along the longitudinal direction of the double bend pipe. The outermost upper stopper 12 is fixed (for example, screwed) to the support 16. The other upper stoppers 12 are fixed to the support 16 via the outer upper stopper 12 by being fixed to the outer upper stopper 12. The upper stopper 12 can be formed of a rectangular parallelepiped piece of wood.

  In order to prevent the double bend pipes stacked from coming into contact with each other and being damaged, the double bend pipes 41 are stacked with a concave clip (not shown) interposed therebetween. This clip can employ the materials and shapes described above.

  The first cushioning material 21 is disposed between the placement stopper 11 and the double bend pipe 41 accommodated at a position immediately above and closest to the placement stopper 11. Thus, the double bend pipes 41 stacked in a predetermined number of stages are placed on the placement stopper 11 with the first buffer material 21 interposed therebetween. The first cushioning material 21 shown in the figure has a rectangular parallelepiped shape.

  On the other hand, the second cushioning material 22 is disposed between the placement stopper 11 and the double bend pipe 41 accommodated at a position immediately below and closest to the placement stopper 11. As a result, the second cushioning material 22 is interposed between the placement stopper 11 and the double bend pipe 41 accommodated at a position directly below and closest to the placement stopper 11. The second cushioning material 22 shown in the figure is cylindrical.

  Further, the third buffer material 23 is disposed between the upper stopper 12 and the double bend pipe 41 accommodated at a position directly below and closest to the upper stopper 12. As a result, the third cushioning material 23 is interposed between the upper stopper 12 and the double bend pipe 41 accommodated at a position directly below and closest to the upper stopper 12. The third cushioning material 23 shown in the figure is cylindrical.

  The inner pressing plate 20 is disposed inside the double bend pipe 41 having the smallest pitch, that is, inside the double bend pipe 41 accommodated inside. A spacer 32 is disposed between the inner pressing plate 20 and the double bend pipe 41 having the smallest pitch.

  A spacer 32 is disposed to partition between the double bend pipe 41 stacked on the inner side and the double bend pipe 41 stacked on the outer side. Moreover, in the same figure, the spacer 32 is arrange | positioned in order to partition between the double bend pipe | tube 41 stacked | stacked in the innermost side and the inner side pressing board 20 inside. By arranging the spacer 32 in this way, the double bend pipe 41 is prevented from moving in the lateral direction during transportation, packing, and assembling (when taking out).

  In the bend tube packing structure of the present invention, the spacer 32 extends from the mounting stopper 11 arranged at the lowest position to the upper stopper 12. As described above, in the bend pipe packing structure of the present invention, a single spacer 32 covers the entire range in the vertical direction without arranging a plurality of spacers 32 in the vertical direction. For this reason, the gap like the conventional packing structure does not arise.

  Therefore, the packaging structure of the bend pipe according to the present invention is a double stacked by carrying in a double bend pipe stacked at the time of packing, or by unloading a double bend pipe stacked at the time of assembly (at the time of removal). The bend pipe does not get caught in the gap. For this reason, deformation of the double bend pipe in carrying-in work and carrying-out work can be prevented.

  Here, the conventional packing structure shown in FIG. 1 fixes the lower part of another spacer together with the upper part of the spacer when fixing the mounting stopper between the lowest position stopper and the upper stopper. To do. On the other hand, the bend tube packing structure of the present invention fixes the middle of the spacer 32 when fixing the mounting stopper between the lowest mounting stopper and the upper stopper, Do not fix another) spacer. As a result, screwing and nailing locations can be halved, damage to the double bend pipe can be reduced, and work efficiency can be improved.

  In the bend pipe packing structure of the present invention, the first buffer material 21, the second buffer material 22, and the third buffer material 23 are disposed and filled in the gaps above and below the stacked double bend pipes 41. Accordingly, the double bend pipe 41 is separated from the placement stopper 11 and the upper stopper 12. For this reason, even when a screw or a nail enters diagonally when the placement stopper 11 or the upper stopper 12 is fixed, it is difficult to reach the double bend pipe 41. Further, if the height of the cushioning material is appropriately set according to the length of the screw or nail, it is possible to completely prevent the screw or nail from entering diagonally and reaching the double bend pipe 41. Thus, the bend pipe packing structure of the present invention can reduce damage to the double bend pipe.

  Further, even if vibration or the like occurs during transportation, it can be absorbed by the buffer material, and deformation of the double bend pipe 41 can be prevented. Such a 1st buffer material 21, the 2nd buffer material 22, and the 3rd buffer material 23 can be comprised, for example with expandable polyethylene, expandable polystyrene, and those composites.

  In addition, in the bend pipe packing structure of the present invention, a plurality of mounting stoppers 11 are arranged between the spacers 32, and the mounting stoppers 11 are fixed to the support column 16. For this reason, the double bend pipe 41 to be packed is firmly held by the spacer 32, the mounting stopper 11, and the column 16. Therefore, even when a large number of bend pipes having the same pitch are packed (for example, when about 100 bend pipes having the same pitch are packed), the pack can be stably packed without causing collapse.

  In the bend tube packing structure of the present invention, the outermost placement stopper 11 among the placement stoppers 11 is fixed to the support column 16, and the placement stopper 11 inside the outermost placement stopper 11. However, it is preferably fixed to the column 16 by being fixed to another mounting stopper 11 adjacent to the mounting stopper via a spacer 32 on the outside. Thereby, after the operation | work which continues packing the double bend pipe | tube of a certain pitch is completed, the stopper 11 for mounting used for the packing of the double bend pipe | tube of the next pitch can be fixed (arrangement | positioning). For this reason, when the operation | work which continues and packs the double bend pipe | tube with the same pitch is performed in order from the outer side to the inner side, the workability | operativity improves significantly.

  Similarly to the mounting stopper, the outermost upper stopper 12 among the upper stoppers 12 is fixed to the support column 16, and the upper stopper 12 on the inner side of the outermost upper stopper 12 is the upper stopper. It is preferably fixed to the column 16 by being fixed to another upper stopper 12 adjacent to the outside via a spacer 32 on the outside.

  In the bend tube packing structure of the present invention, the mounting stopper 11 has at least four pilot holes for screwing, and the pilot holes used for fixing the mounting stopper 11 are connected to the mounting stopper 11. It is preferably a pilot hole at a position that is not used for fixing another mounting stopper 11 adjacent to each other through the spacer 32 on the outside. The reason will be described with reference to FIG.

  FIG. 4 is a schematic view showing the placement position and use location of the mounting hole of the mounting stopper. FIG. 4 (a) shows the N-1th mounting stopper from the outside, and FIG. 4 (b). Indicates the Nth placement stopper from the outside. This figure is a view of the placement stopper 11 placed in the packing structure as viewed from the inside, and the pilot holes used for screwing are indicated by bold lines. The mounting stopper 11 shown in the figure is provided with four screw holes (11a to 11d), and the pilot holes (11a to 11d) are all formed from the surface of the mounting stopper. It penetrates to the back of the opposite side. The four pilot holes (11a to 11d) are arranged so that a figure formed by connecting the axes in a straight line in order is an isosceles trapezoid.

  As shown in FIG. 6A, the (N-1) th placement stopper 11 from the outside is screwed together with the spacers 11a and 11c together with the spacer arranged on the inside. Further, as shown in FIG. 5B, the Nth placement stopper 11 is screwed together with the spacers arranged inside thereof using the pilot holes 11b and 11d. For this reason, the pilot hole used for fixing the Nth placement stopper 11 is a pilot hole at a position not used for fixing the N−1th placement stopper 11.

  If the mounting stopper 11 is provided with a pilot hole for screwing in this manner, it is possible to further reduce the screw from being tightened obliquely and to further reduce the damage to the double bend pipe 41. If the pilot hole used for fixing the Nth placement stopper 11 is mistakenly used as the pilot hole at the position used for fixing the N-1th placement stopper 11, the screw interferes. It cannot be tightened. For this reason, it is also possible to prevent the mounting stopper from being screwed using an erroneous prepared hole.

  The arrangement of the four pilot holes of the mounting stopper may be rectangular, for example, but is preferably an isosceles trapezoid as shown in FIG. Here, if the distance d1 (see FIG. 4A) between the upper and lower adjacent pilot holes is short, the mounting stopper 11 may be cracked after screwing. If the placement of the four pilot holes of the mounting stopper is an isosceles trapezoid, the vertical distance d2 of the pilot holes adjacent in the vertical direction is the same if the distance d1 (straight distance) between the vertical holes adjacent in the vertical direction is the same. (See FIG. 4A) is shorter than the rectangular shape. For this reason, the height of the mounting stopper can be lowered, and the height of the packaging structure can be lowered accordingly.

  In addition, if the arrangement of the four pilot holes (11a to 11d) of the mounting stopper is an isosceles trapezoid, the arrangement of the pilot holes (11a to 11d) on the surface and the back surface on the opposite side The arrangement of the pilot holes (11a to 11d) is the same. For this reason, it is not necessary to pay attention to the front and back when using the mounting stopper, and the workability can be further improved.

  Similar to the mounting stopper 11, the upper stopper 12 also has at least four pilot holes for screwing, and the pilot holes used for fixing the upper stopper 12 have spacers 32 on the outside with the upper stopper 12. It is preferably a pilot hole at a position that is not used for fixing another upper stopper 12 adjacent to each other. The arrangement of the four pilot holes in the upper stopper may be rectangular, for example, but is preferably an isosceles trapezoid.

  The packing structure for a bend pipe according to the present invention includes a spacer 32, a cover pressing plate 24, a mounting stopper 11, an upper stopper 12, and a first stopper when packing a double bend pipe for a steam generator installed in a nuclear power plant. The surface of the buffer material 21 is covered with a resin sheet (for example, a polyethylene sheet). As the resin sheet, a cylindrical sheet or a bag-shaped sheet can be used. As a result, the double bend pipe 41 accommodated and the wooden spacer 32 are prevented from coming into direct contact.

  In the bend pipe packing structure of the present invention, it is preferable that the inner pressing plate 20 is disposed inside the double bend pipe 41 having the smallest pitch. As a result, the occurrence of cargo collapse during transportation can be prevented. The inner pressing plate 20 can be constituted by, for example, a wooden plate (thickness is about 24 mm, for example). For example, the inner pressing plate 20 can be disposed on the inner side of the position of all of the plurality of support columns 16 disposed along the longitudinal direction of the double bend pipe 41. Moreover, as long as the effect of preventing the collapse of the load can be exhibited, thinning may be performed, and a part of the plurality of support columns 16 may be disposed inside the position.

  The bend pipe packing structure of the present invention can adopt a form in which a beam is arranged on the upper portion of the support column 16. Thereby, the intensity | strength of a packing structure can be improved and when a whole packing structure is lifted with a crane etc., it can prevent that a double bend pipe | tube changes with a deformation | transformation of a packing structure. The arrangement of the beams on the upper portions of the columns may be appropriately performed according to the total mass of the packing structure.

  The bend pipe packing structure of the present invention has the same number of bend pipes packed with the same pitch from the viewpoint of improving packing efficiency, that is, the bend accommodated between the lowermost placement stopper 11 and the upper stopper 12. The number of tubes is preferably 40 or more, more preferably 60 or more, and most preferably 80 or more. On the other hand, if the number of bend pipes with the same pitch exceeds 120, the packing structure becomes too high and a special building or crane facility may be required.

  The bend pipe packing structure of the present invention stores and packs the stacked bend pipes as a unit. The number of the stacked bend pipes is usually 10 to 30, and 15 to 25 is often used.

  Next, a method for storing and packing a bend pipe in the above-described packing structure of the present invention (bending pipe packing method of the present invention) will be described.

  FIG. 5 is a cross-sectional view schematically showing a procedure example of the packing method of the present invention, where FIG. 5A is a procedure for arranging a cover, FIG. 5B is a procedure for fixing the lower part of the spacer, and FIG. (C) shows the procedure for carrying in the stacked bend pipes, and (d) shows the procedure for fixing the mounting stopper. This figure is a sectional view taken along the line BB in FIG. In FIG. 2A, the sheet-like cover 15 is indicated by a thick line, and in FIG. 1B to FIG.

  When packing the double bend pipe, the floor panel 18 and the column 16 are covered with a sheet-like cover 15, and a part of the cover 15 is sandwiched between the column 16 and the cover pressing plate 24. In this state, the cover pressing plate 24 is fixed to the column 16, and a part of the cover 15 is sandwiched between the column 16 and the cover pressing plate 24 as shown in FIG. A plurality of such cover pressing plates 24 are arranged along the longitudinal direction of the double bend pipe to be accommodated. A portion of the cover 15 located outside the support column is folded after all the double bend pipes are accommodated, and is disposed between the upper stopper and the lid.

  Then, the work which continues packing a double bend pipe with the same pitch is performed. In this operation, first, the mounting stopper 11 is fixed to the support column 16 together with the lower portion of the spacer 32 arranged on the inner side, as shown in FIG. The buffer material 21 is placed. A plurality of the placement stoppers 11, the spacers 32, and the first buffer materials 21 are arranged along the longitudinal direction of the double bend pipe to be accommodated.

  The stacked double bend pipes 41 are placed on the fixed placement stopper 11 with the first cushioning material 21 interposed, as shown in FIG. The loading operation of the stacked double bend pipes 41 is to load the stacked double bend pipes 41 suspended by a crane or the like from above the column 16 and place them on the mounting stopper 11. Is done by.

  Another placement stopper 11 is disposed above the stacked double bend pipes, and the placement stopper 11 is fixed together with the middle of the spacer 32. The second buffer material 22 is disposed between the fixed lower surface of the mounting stopper 11 and the double bend pipe 41 stacked, and the first buffer material is mounted on the upper surface of the mounting stopper 11. As a result, the state shown in FIG. A plurality of other placement stoppers 11, the first cushioning material 21 and the second cushioning material 22 are arranged along the longitudinal direction of the double bend pipe to be accommodated.

  By repeating the above-described steps (c) and (d), double bend pipes having the same pitch are successively stored and packed. In this way, the double bend pipe is placed up to the uppermost stage. In the step of placing another mounting stopper above the uppermost double bend pipe, the upper stopper is fixed together with the upper part of the spacer instead of the mounting stopper, and the lower surface of the fixed upper stopper is stacked. A third cushioning material is disposed between the double bend pipe. As a result, the double bend pipe is accommodated up to the uppermost stage, and the work of continuously packing the double bend pipe having the same pitch is completed.

  The operation of continuously packing double bend pipes having the same pitch in this order is repeated in order from the outside to the inside, that is, in order from the long double bend pipe pitch.

  After all double bend pipes are stored and packed, the inner pressing plate is fixed inside the innermost spacer. Further, after covering the upper surface of the upper stopper with a sheet-like cover, the exterior panel is fixed to the outside of the column and the lid is fixed. As a result, the packaging structure as shown in FIG. 3 is completed.

  In the above embodiment, the bend pipe packing structure and packing method of the present invention have been described with reference to the case where the bend pipe is a double bend pipe. This can also be applied to the case where is a U-bend tube. When the bend pipe is a U-bend pipe, it does not have an intermediate straight portion unlike a double bend pipe, so the center of the curved portion is held by a mounting stopper or spacer. At that time, the shapes of the mounting stopper and the spacer are appropriately adjusted according to the curvature of the curved portion.

  The bend pipe packing structure and packing method of the present invention can reduce the damage of the double bend pipe at the time of packing or taking out and can prevent deformation. For this reason, if this invention is applied to the packaging of the double bend pipe | tube for steam generators, while the defective rate of a double bend pipe | tube can be reduced, working efficiency can be improved. Therefore, the packaging structure for a bend pipe of the present invention can be effectively used for packaging a double bend pipe for a steam generator.

11: Stopper for mounting 11a to 11d: Pilot hole, 12: Stopper for upper part,
13: Box-shaped container, 14: Lid, 15: Cover, 16: Prop,
17: Lower frame, 18: Floor panel, 19: Exterior panel,
20: Inner pressure plate, 21: First cushioning material, 22: Second cushioning material,
23: Third cushioning material, 24: Cover pressing plate, 31: Conventional spacer,
32: Spacer according to the present invention 41: Double bend pipe

Claims (4)

The bend pipe is a packaging structure in which the same pitch is stacked and stored in a plurality of stages in the vertical direction, and the pipes are arranged in order from the outside in order from the longest pitch,
A plurality of bend pipes that are arranged along the longitudinal direction of the bend pipe and that are further arranged in the vertical direction and that are arranged from the outside to the inside and stacked in a predetermined number of stages. A stopper for placing,
A plurality of stoppers arranged along the longitudinal direction of the bend pipe, and further arranged from the outside to the inside, and located above the uppermost bend pipe;
A spacer extending between the bend pipes adjacent on the outside and the inside and extending from the placement stopper described above to the upper stopper disposed at the lowest position;
A first cushioning material interposed between the mounting stopper and the bend pipe stored at a position immediately above and closest to the mounting stopper;
A second cushioning material interposed between the placement stopper and the bend pipe stored at a position immediately below and closest to the placement stopper;
A third cushioning material interposed between the upper stopper and the bend pipe stored immediately below and closest to the upper stopper;
A plurality of bend pipes arranged on the outside of the bend pipe having the largest pitch along the longitudinal direction thereof, and comprising a stopper for fixing the upper stopper, the upper stopper, and the spacer. Packing structure.   The outermost placement stopper among the placement stoppers described above is fixed to the column, and the placement stopper inside the outermost placement stopper is located outside the placement stopper. The bend pipe packing structure according to claim 1, wherein the structure is fixed to the support column by being fixed to another mounting stopper adjacent to each other via a spacer. The mounting stopper is screwed to another mounting stopper or the column, which is adjacent to the mounting stopper and the spacer on the outside through the spacer, together with the spacer arranged inside the mounting stopper. Fixed by
The mounting stopper has at least four pilot holes for screwing,
The pilot hole used for fixing the mounting stopper is the pilot hole at a position not used for fixing another mounting stopper adjacent to the mounting stopper on the outside via the spacer. The packaging structure for a bend pipe according to claim 1 or 2. A method for packing a bend pipe by the packing structure according to claim 1,
Including the step of continuously packing the bend pipes having the same pitch by repeating the process of packing the bend pipes stacked in a plurality of stages in the vertical direction;
The bend pipe packaging method, wherein the steps are repeated in order from the long pitch of the bend pipe.

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