JP2015157637A - Packing box and method for packing heavy object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing box in which a heavy object can be housed by being assembled while being loaded from a lateral side without being lifted high to an upper position, which secures strength on a bottom surface side after packing, and from which the heavy object can be taken out from the lateral side without complete unpacking even after the packing.SOLUTION: A bottom surface part 2 and a lid surface part 3 are extended to the opposed upside and downside of a rectangular loading side surface part 1 via a fold line, and side parts 4 are extended to opposed right and left sides via a fold line. Reinforcing bottom parts 5 are provided on the bottom surface part 2 sides of both the side parts 4, respectively. Joints 6 are provided at ends of the reinforcing bottom parts 5, respectively. The bottom surface part 2 is provided with a folding side surface part 7.

Description

  The present invention relates to an assembly-type packaging box for packaging an article, and more particularly, to a packaging box suitable for packaging an article made of a heavy article such as a water tap with a saddle, and a heavy article packaging method.

  Conventionally, as a general packing box for packing goods such as products, a bottom plate, four side plates standing up from this bottom plate and assembled in a frame shape, and extending from one of the side plates are extended. There is known a box having a structure having a top plate provided on the top. When a water faucet with a saddle is packed as an article in such a packing box, the water faucet with a saddle is a heavy object, so that appropriate reinforcement is necessary to ensure strength. When packing a faucet with a saddle in this kind of packaging box, the water faucet with a saddle is occupied by a saddle and a band by 70 to 80% by weight. These are arranged, and when packing, open the lid, store the band and saddle in order from the top, put accessories such as fixing bolt set in the gap part, close the lid, and cover the lid with adhesive tape Or the whole is fixed with a string-like fixing band.

As such a heavy packaging box, for example, a folding packaging box of Patent Document 1 is disclosed. In this box, when the container main body is assembled in a container shape and a heavy object is stored in the container main body, the strength against the heavy object is secured by the bottom wall side reinforced in a double structure.
In the assembly type box of Patent Document 2, the four side plates are provided in a double structure, and the whole is reinforced with the side plates provided in the shape of a frame, thereby improving the compressive strength and enhancing the impact resistance. ing.

On the other hand, when packing a heavy product, it is required to store the product more easily without lifting it up above the packing box.
For example, in the corrugated cardboard box of Patent Document 3, a movable side wall that is foldably continuous to one adjacent side wall and separated from the other side wall and the bottom is provided, and the article is opened with this movable wall opened. The packaging or unpacking operation can be performed without lifting a heavy item up to the upper position of the box.
As a packaging box in which an item can be taken out from the side, a packaging box of Patent Document 4 is disclosed. In this packaging box, the front side plate is provided so as to be openable and closable with respect to the bottom plate, and the side plates of the stacked packaging boxes are opened so that the product can be taken out from the side.

Japanese Utility Model Publication No. 53-161939 JP 2005-187010 A JP-A-10-86929 Japanese Patent No. 4115717

When heavy objects are packed in the folding packaging box of Patent Document 1 described above, the strength of the bottom wall is ensured by the double structure, but when storing heavy objects, the container body assembled in a container shape Since it is necessary to lift a heavy object to the upper side of the box, a large force is required to lift it, which makes packing difficult. Also in the assembly type box of Patent Document 2, a large force is required to lift a heavy object up above the four side plates assembled in a frame shape.
Temporarily, when packing a water faucet with a saddle in a packing box of these structures, after storing a band of about 3 to 5 kg from the top of the box to the bottom, about 5 to 8 kg to which a water stop is connected. The saddle must be stored in the same way, which is hard work. In addition, the box opening has a rectangular shape with the minimum dimensions corresponding to the length x width of the saddle or band, and there is no space for inserting both hands while supporting the band or saddle. Is placed from the top to the bottom, it is a one-handed operation, and repeating this packing operation increases the burden on the operator and causes fatigue accumulation and reduced work efficiency.
In the case of unpacking the packing box, there is a problem that the risk increases due to the one-handed work of taking out heavy parts.
Furthermore, the assembling-type box of Patent Document 2 is intended to increase the strength of the frame portion by a double-structure side plate, and the bottom plate side on which the packing articles are placed is not reinforced. For this reason, when trying to pack the water faucet with a saddle, it is difficult to endure the weight.

The corrugated cardboard box of Patent Document 3 is configured so that an article can be accommodated without lifting up the box by opening the movable side wall. However, improvement in strength on the bottom side of the box is not disclosed or suggested. In order to improve the strength of the cardboard box, it is particularly necessary to firmly fix the bottom surface side. For example, the cardboard box needs to be firmly fixed with an adhesive tape or the like in a state where the box is assembled to ensure the strength. Moreover, it is necessary to assemble the box before packing the item, and the box cannot be assembled simultaneously with the packing of the item. Therefore, when packing is started from the assembly of the box, the number of work steps until the packing of the product is completed increases. On the other hand, when the box is assembled in advance, a large installation space for placing the box is required. I need it.
The packaging box of Patent Document 4 is a box premised on being stacked on each other, and the contents of the packaging box are intended for lightweight items such as confectionery. Therefore, the bottom plate is not reinforced, and it is difficult to use a packaging box having this structure as a box for packing heavy objects such as a water faucet with a saddle.

  The present invention has been developed in order to solve the conventional problems. The object of the present invention is to assemble and store a heavy object while placing it from the side without lifting it upward. An object of the present invention is to provide a packing box that can secure the strength of the side and can take out heavy objects from the side without unpacking the whole after packing.

  In order to achieve the above object, the invention according to claim 1 includes a bottom surface portion and a lid surface portion that extend through a fold line on opposite upper and lower sides of the rectangular placement side surface portion, and on the opposite left and right sides. The side part was extended through the fold line, and the bottom part of each side part was provided with a reinforcing bottom part, the joint part was provided at the end part of each reinforcing bottom part, and the folding side part was provided on the bottom part. It is a packing box.

  The invention according to claim 2 is provided with a locking piece on one reinforcing bottom, a locking groove on the other reinforcing bottom, and when the both reinforcing bottoms are erected, the locking piece is locked on the locking groove. This is a packing box in which both reinforcing bottoms are joined.

  The invention which concerns on Claim 3 is a packaging box which provided the fold-up part in the intermediate position along the left-right direction of a fold side surface part, and the tongue-shaped piece on both sides of the fold side surface part, respectively.

  The invention which concerns on Claim 4 is a packaging box which provided the tongue piece in the cover surface part side of the side part, and extended the folding piece in the cover surface part.

  The invention according to claim 5 is a position where the packing box is expanded with the mounting side surface portion being the bottom surface side, the both side portions and the reinforcing bottom portion are bent along a folding line in a predetermined folding direction, and the joint portions are overlapped with the bottom surface portion. At the same time, a heavy object is placed horizontally on the mounting side surface so that the mounting side after packing is positioned on the reinforcing bottom side, and then the lid surface portion, the bottom surface portion, and the folding side surface portion are each folded to a predetermined degree. Weight that is bent in the direction, and the entire side is covered by covering the opening side with the lid surface portion and the folding side surface portion with the reinforcing bottom portion and the bottom surface portion overlapped on the loading side after packing heavy objects It is a packing method for things.

According to the first aspect of the present invention, the bottom surface portion and the lid surface portion are provided on the upper and lower sides of the placement side surface portion, the side portions are provided on the left and right sides of the placement surface side portion, and the reinforcing bottom portion is provided on the bottom surface portion side of the side portion. By providing a joint at the bottom of these reinforcements, even if the product for packing is a heavy item in the unfolded state, it can be lifted from the side by two-handed work without lifting the product high Can be assembled and stored in a box shape from the mounted state. Therefore, the worker's fatigue is reduced and the working efficiency is remarkably improved. After packing, the double-bottom structure where the bottom and top of the reinforcement overlap each other provides adequate cushioning while ensuring sufficient strength on the bottom side, and receives heavy loads from these items. To prevent the bottom side from coming off or being damaged. And when taking out goods after packing, it becomes possible to take out from the side, without unpacking the whole by opening a folding side surface part side and a cover surface part in the state which raised vertically.
Because of these, when trying to pack a water faucet with a saddle as an article, the band and saddle can be placed together with accessories and placed on the mounting side, and assembled and packed from this state. , It is not necessary to pack a heavy cock with a saddle, and after packing, the weight of the band, saddle, etc. is received at the reinforcing bottom and bottom to expose or impact these parts to the outside. Damage due to can be prevented. When these items are taken out, they can be pulled out side by side from the side of the folding side portion one by one in the order of accessories, saddles and bands without requiring a strong force.

  According to the invention of claim 2, by locking the locking piece and the locking groove and joining the reinforcing bottoms of both, it is possible to lock these instantaneously and lead to a significant reduction in packing time. In addition, since the locking pieces and the locking grooves can be firmly locked while having simple shapes, the strength on the bottom surface side can be ensured after joining.

  According to the invention which concerns on Claim 3, it can unpack so that a fold expansion part may be expanded, and can take out goods easily from the opening part which opened the fold expansion part side, without releasing the whole packing. At this time, the lid surface part can also be expanded, so that it is easier to take out the product by opening the opening part larger, and the product placed on the bottom side of the box can be easily taken out, and further, between the box and the product. There is no risk of getting your hands caught. By providing the tongue-shaped pieces on both sides of the folded side surface portion, the folded side surface portion can be assembled while being guided by the tongue-shaped piece, and at this time, the fold-up portion can be folded at a predetermined position by the tongue-shaped piece.

  According to the invention which concerns on Claim 4, it can pack, maintaining the box shape by folding in the box shape which each assembled the tongue piece and the folding piece, and the box-shaped intensity | strength is ensured by these tongue piece and the folding piece. The folding of the tongue piece and the folding piece eliminates the need for a margin for gluing, thus simplifying the shape and reducing the material.

  According to the invention which concerns on Claim 5, it can assemble and pack in a box shape after putting it on the packing box expanded without lifting a heavy article high, and after packing, by double structure by a reinforced bottom part and a bottom part Ensure the bottom side strength and maintain the packaging of heavy items. For this reason, it is particularly suitable when packing a water faucet with a saddle as a heavy object, packing a heavy band or saddle without lifting it high, preventing damage to these items after packing, and reducing the external dimensions. Storage and transportation are facilitated by reducing the size and reducing the size.

It is an expanded view which shows one Embodiment of the packaging box in this invention. It is a perspective view of the packaging box in FIG. It is a perspective view which shows the state which joined the reinforcement bottom parts of the packaging box of FIG. It is a schematic plan view which shows the state which mounted the heavy article in the packaging box. It is a perspective view which shows the state which bent the cover surface part of the packaging box of FIG. It is a perspective view which shows the state which folded the folding side part of the packaging box of FIG. It is a perspective view which shows the state which adhered the packaging box of FIG. 6 with the adhesive tape. It is a perspective view which shows the state which expanded the fold-up part of the packaging box of FIG.

  Below, the packaging box in this invention is demonstrated in detail based on embodiment. In FIG. 1, one Embodiment of the packaging box in this invention is shown, In FIGS. 2-7, the packing procedure in the case of packing a heavy article with the packaging box of FIG. 1 is shown.

  As shown in FIG. 1 and FIG. 2, the packing box is formed so as to be developed into a sheet shape by using a single sheet of material such as general cardboard or cardboard, and the loading side surface portion 1, the bottom surface portion 2, the lid surface portion. 3, side portions 4, 4, reinforcing bottom portion 5, joint portion 6, folding side surface portion 7, and fold lines 11 to 19 indicated by broken lines or alternate long and short dash lines are provided between them. The packaging box is provided by being bent up to 19. In the packing box, for example, the water faucet with saddle 20 shown in FIGS. 3 and 4 is packed as an item to be packed.

  The saddle-equipped water faucet 20 has a saddle portion 21 and a band portion 22 and is housed in a state where they are disassembled. Further, in the packing box, an accessory 24 such as a bolt and nut 23 for fixing the saddle portion 21 and the band portion 22 to a pipe (not shown) and a packaged waterproof sheet are enclosed. Hereinafter, in the present embodiment, a set including the water faucet 20 with a saddle for packing, the bolt nut 23, and the accessory 24 is referred to as a heavy object 25.

In the packaging box, the placement side surface portion 1 is formed in a rectangular shape having a predetermined size, and serves as a placement side on which the heavy object 25 is placed during the packing operation. A bottom surface portion 2 and a lid surface portion 3 are respectively provided on the upper and lower sides of the mounting side surface portion 1 through fold lines 11 and 12 provided in parallel, and can be bent by the fold lines 11 and 12. It is done. The bottom surface portion 2 and the lid surface portion 3 are opposed surfaces of the packaging box after assembly and are provided in the same size. After the packaging box is assembled, the bottom surface portion 2 side is disposed on the bottom surface, and the lid surface portion 3 side is disposed on the top surface, so that the weight 25 is added to the bottom surface portion 2 side.
In the present embodiment, fold lines 11 to 15 and fold lines 17 to 19 are indicated by broken lines, and in FIG. 1, adjacent surfaces are bent in the valley fold direction via each fold line.

  Side portions 4 and 4 are extended on the opposite left and right sides of the mounting side surface 1, that is, on the orthogonal side of the upper and lower sides, via parallel folding lines 13 and 13, respectively, and bent by these folding lines 13 and 13. Provided possible. These side portions 4 are provided in the same shape so that the length in the extending direction is the same as the length in the extending direction of the bottom surface portion 3 and the lid surface portion 4, and these side portions 4, the bottom surface portion 2, and the lid surface portion. When the 3 is bent, a storage portion 26 having an appropriate volume as shown in FIG. 5 is provided. 1 and 8, the height H of the packaging box after providing the storage portion 26 is the length of the placement side surface portion 1, the folding side surface portion 7 in the short side direction, and the side portion 4 in the long side direction. Thus, the width W of the packaging box is the length in the long side direction of the placement side surface portion 1 and the folding side surface portion 7, and the thickness D of the packaging box is the length of the side portion 4 in the short side direction. The size of the storage portion 26 is determined by the height H, width W, and thickness D.

  Reinforcing bottom portions 5 are provided on the side of the bottom surface portion 2 of both side portions 4 and 4 via folding lines 14, respectively. Each reinforcing bottom 5, 5 is formed with a dimension slightly shorter than the thickness D when the storage section 26 is provided, and is provided with a dimension slightly longer than half of the length of the width W. Joint portions 6 that can be joined to each other are provided at the end portions of the respective reinforcing bottom portions 5.

  In this case, a substantially trapezoidal protruding locking piece 30 on one reinforcing bottom 5 side, and a locking groove 31 formed in a substantially trapezoidal cutout so that the locking piece 30 can be locked on the other reinforcing bottom 5. Are provided, and thereby the joint portion 6 is provided. The reinforcing bottom portions 5 and 5 are provided so that the reinforcing bottom portions 5 and 5 can be joined to each other when the locking piece 30 is locked to the locking groove 31 in a state where the reinforcing bottom portions 5 and 5 are erected by the folding line 14. .

Here, as a means for engaging a pair of projecting portions in the packaging box, a structure called “N-type” indicated by reference numerals 151 and 152 in Patent Document 2 is known. This structure engages “cuts” provided in both projecting portions, and is used in a relatively thin packaging box, particularly in a portion constituting a side wall. On the other hand, in the embodiment of the present invention, the plate thickness is 8 to 10 mm and a thick packing box constitutes the reinforcing bottom surface of the heavy-weight packing box. Since the cut is necessary, the strength of both projecting portions is reduced. Moreover, the operation | work which matches both cuts becomes difficult, so that plate | board thickness becomes thick.
Therefore, as described above, by providing the substantially trapezoidal locking piece 30 and the locking groove 31 in the range of the thickness D, the trapezoidal shape and the plate thickness are used to engage strongly. Can do. In addition, the engaging piece 30 can be engaged with the engaging groove 31 by simply bending the engaging piece 30 along the crease and sliding it back to the original state, and the engaging operation becomes easy.

The folding side surface portion 7 is provided in a shape having the same size as the mounting side surface portion 1 via a folding line 15 parallel to the folding line 11 and becomes an opposing surface of the mounting side surface portion 1 after assembly.
At the intermediate position along the left-right direction of the foldable side surface portion 7, a fold-up portion 40 is provided via a fold line 16 shown by a one-dot chain line. It is provided so that it can be bent. Appropriately sized tongue-like pieces 41 and 41 are provided on both sides of the folding side surface portion 7, respectively, and these tongue-like pieces 41 are provided so as to be foldable in the valley folding direction via the folding lines 17 and 17.

  Tongue pieces 50, 50 are provided in appropriate lengths on the lid surface part 3 side of the side part 4 via folding lines 18, 18, while folding pieces 51 are suitably provided on the lid surface part 3 via folding lines 19. Provided in length. The tongue piece 50 and the folding piece 51 are folded inward when assembled as a packaging box, and the tongue piece 50 is placed on the back side of the lid surface portion 3 and the folding piece 51 is placed on the back side of the folding side surface portion 7 to form a box shape. Is supposed to maintain. On the side of the folding side surface 7 of the side portion 4, a receiving piece 52 is provided via a folding line 53 at a position that is below the folding expansion portion 40 of the folded side surface 7 after packing.

The above-mentioned water faucet 20 with a saddle has a saddle portion 21 and a band portion 22 designed according to the size of the pipe outer diameter, and corresponds to a pipe outer diameter (374.0 mm) up to a nominal diameter of 350 according to the standard. To be provided. The weight of the water faucet with saddle 20 corresponding to the pipes having the nominal diameters of 200, 250, 300, and 350 is heavier than that corresponding to the pipe having the nominal diameter of 150 or less, which means that the outer diameter is increased. In addition, this is because the width dimensions of the saddle portion 21 and the band portion 22 are set in consideration of the holding stability. Furthermore, the bolt diameter of the bolt nut 23 is also affected by M18 mm to M20 mm.
The packaging box of the above-described embodiment is provided with an appropriate height H, width W, and thickness D corresponding to the weight of the saddle-equipped water faucet 20 that increases in size according to the outer diameter of the pipe. Furthermore, in the said embodiment, although it is the heavy article 25 containing the water tap 20 with a saddle, it is also possible to pack various heavy goods other than this.

Next, with reference to FIG. 2 to FIG. 7, a heavy material packaging method and operation using the above-described packaging box will be described.
In this heavy material packing method, the heavy material 25 is placed in a state of being laid sideways on the expanded and expanded packaging box, and the heavy material 25 is stored in this state and packed by assembling the packaging box. Then, the packing box after packing was raised vertically and placed. If each fold line is bent in advance, the packaging box can be easily assembled.

  At the time of packing, first, in FIG. 2, with the mounting side surface portion 1 as the bottom surface side, the packing box is expanded to a work table or floor surface (not shown), and from this state, as shown in FIG. The reinforcing bottom portion 5 is folded in a predetermined folding direction, that is, a valley folding direction, via the folding lines 11, 13, and 14, and the joining portion 6 is joined at a position on the bottom surface side overlapping the bottom surface portion 2. When joining the joining portion 6, the end of one reinforcing bottom portion 5 is overlapped with the end of the other reinforcing bottom portion 5, and the engaging piece 30 is locked so as to be slightly bent toward the engaging groove 31. For example, these can be joined with one touch, and the trapezoidal shape strongly joins them to prevent disconnection after joining. At the time of joining of the joint part 6, the side parts 4, 4 and the reinforcing bottom parts 5, 5 stand up with respect to the placement side part 1.

  Subsequently, the water faucet 20 with a saddle, which is a heavy object for packing, is placed on the placement side part 1 while being disposed so as to be accommodated in the accommodation part 26. At this time, as shown in FIGS. 3 and 4, the band part 22 of the water faucet with saddle 20 is arranged on the reinforcing bottom part 5 side, and the saddle part 21 is placed on the placement side part 1 so as to overlap the band part 22. Put it on. Furthermore, by placing the opening side of the band part 21 and the saddle part 22 on the reinforcing bottom part 5 side, the heavy object 25 is stabilized when the packing box after packing is raised vertically. A buffer member 55 made of a piece of corrugated paper is interposed between the band portion 21 and the saddle portion 22, and the buffer member 55 prevents direct contact between the band portion 21 and the saddle portion 22, thereby peeling off the paint. And prevent damage. Above the saddle portion 21, a bolt nut 23 and an accessory 24 packed in an appropriate bag or the like are placed.

  After the step of placing the heavy object 25 on the placement side surface portion 1, as shown in FIG. 5, the bottom surface portion 2 and the folded side surface portion 7 are each folded in a predetermined folding direction, that is, a valley folding direction, and reinforced. A state in which the bottom 5 and the bottom 2 are overlapped, and the cover surface portion 3 in which the folded piece 51 is folded with respect to the both side portions 4 and 4 in a state in which the receiving piece 52 is folded in FIG. Thus, by folding the folded side surface portion 7 obtained by bending the tongue-like piece 41, the lid surface portion 3 and the folded side surface portion 7 are covered with the opening side and packed. At this time, if the folding expansion portion 40 of the folding side surface portion 7 is straightened without being bent and the tongue-like piece 41 is inserted into the inside of the storage portion 26, the box shape is maintained and the shape is not easily broken.

  Finally, in FIG. 7, the folding side surface portion 7 and the side portion 4 are bonded with the adhesive tape 56 from the vicinity of the folding line 16 of the folding expansion portion 40 to the bottom surface portion 2 side, and the vicinity of the center of the packaging box is wound with the binding band 57. It is possible to prevent the folding / unfolding portion 40 from spreading outward while maintaining the box shape of the packaging box by binding in the mounted state. After packing, storage and transportation may be performed in a state where the packing box is raised vertically so that the bottom surface portion 2 side becomes the bottom surface side.

  In FIG. 8, the unpacking state which opened the folding expansion part 40 of the packaging box is shown. At the time of unpacking, if the binding band 57 of FIG. 7 is cut and removed, the fold expansion part 40 and the lid surface part 3 can be expanded, and the fold expansion part 40 is opened after the lid surface part 3 is opened. If it makes it, it will become easy to take out the water tap 20 with a saddle from the side surface direction of a packing box.

  As described above, the packaging box according to the above embodiment of the present invention includes the bottom surface portion 2, the lid surface portion 3, and the side portions 4 that extend from the placement side surface portion 1 through the fold lines, and the both side portions 4. 4, the reinforcing bottom 5 is provided on the bottom surface 2 side, the joint 6 is provided on the end of the reinforcing bottom 5, and the folded side surface 7 is provided on the bottom 2. The side part 4 and the reinforcing bottom part 5 are erected in a state where the part 1 is on the bottom surface side, the folding side surface part 7 is folded while the lid surface part 3 and the bottom surface part 2 are folded, and a heavy object 25 is formed. It can be placed while being laid and packed while assembling the packing box. For this reason, an operator can reduce a burden, without lifting a heavy article to the upper direction like the packaging box assembled in the box shape, and can package it, improving safety by two-hand work. After packing, the packing box is placed vertically and stored and managed to improve the strength against heavy objects 25 with a double bottom structure consisting of the reinforcing bottom 5 and the bottom 2, and these are made of corrugated cardboard. It is also possible to prevent the weight 25 from being damaged or damaged due to absorption of vibrations such as time. In addition, since the occupation area when the packaging box is placed can be reduced by the vertical placement, storage and transportation are facilitated.

  Since the heavy goods 25 are packed with the cardboard in the unfolded state, it is not necessary to assemble the cardboard in a box shape in advance, and the heavy goods 25 can be packed using the cardboard provided in the sheet state by cutting or the like. It is also possible to store the sheet-like cardboard in a small installation space. Thereby, the man-hour at the time of packing work can be reduced, and it becomes also possible to implement packing work continuously.

  Furthermore, since the packing operation from the storage of the heavy object 25 to the bonding with the adhesive tape 56 and the binding with the binding band 57 can be performed without changing the direction of the box, the work efficiency is improved.

  The packing box and heavy goods packing method according to the present invention can be applied to various heavy products and parts other than the water cock with a saddle, and furthermore, various goods other than heavy goods can be packed. It can also be used widely.

DESCRIPTION OF SYMBOLS 1 Placement side part 2 Bottom face part 3 Cover surface part 4 Side part 5 Reinforcement bottom part 6 Joining part 7 Folding side part 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 Folding line 25 Heavy load 30 Engagement Stop piece 31 Locking groove 40 Folding expansion part 41 Tongue piece 50 Tongue piece 51 Folding piece

Claims (5)

  A bottom surface portion and a lid surface portion are extended via folding lines on the upper and lower sides facing the rectangular mounting side surface portion, and side portions are extended via folding lines to the left and right sides facing each other. A packaging box, wherein a reinforcing bottom portion is provided on each bottom portion side, a joint portion is provided at an end portion of each reinforcing bottom portion, and a folded side surface portion is provided on the bottom portion.   A locking piece is provided on one reinforcing bottom, a locking groove is provided on the other reinforcing bottom, and when both reinforcing bottoms are erected, the locking piece is locked to the locking groove and both reinforcing bottoms are joined. The packaging box according to claim 1, which is configured to do so.   The packaging box according to claim 1 or 2, wherein a fold-up portion is provided at an intermediate position along the left-right direction of the folding side surface portion, and tongue-like pieces are provided on both sides of the folding side surface portion.   The packaging box according to any one of claims 1 to 3, wherein a tongue piece is provided on the lid surface portion side of the side portion, and a folding piece is extended on the lid surface portion.   The packaging box according to any one of claims 1 to 4 is expanded with the placement side surface portion set as a bottom surface side, and the both side portions and the reinforcing bottom portion are bent along a fold line in a predetermined folding direction to perform the bonding. The parts are joined at a position where they are overlapped with the bottom surface part, and the lid surface part, the bottom surface part, and the folded side surface part are each folded in a predetermined manner through a step of placing a heavy object for packing on the placement side part. A heavy article packing method, wherein the opening side is covered and packed by the lid surface portion and the folded side surface portion in a state where the reinforcing bottom portion and the bottom surface portion are overlapped with each other.

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