JP4012555B2 - Stackable shelf structure - Google Patents

Description

  The present invention relates to a structure of a basket-like shelf arranged on the outer peripheral side of a so-called pallet, and in particular, a shelf that can be stacked in a plurality of stages by fitting engagement portions and locking portions provided on the top and bottom of the shelf body. Concerning structure.

  As is well known, for example, pallets for placing and managing automobile parts or frozen meat in a warehouse are stacked in a plurality of stages using a shelf formed in a basket shape on the outer peripheral side, and the warehouse It is designed to save space inside.

  As such a conventional stackable shelf structure, for example, there is one described in the following Patent Document 1 filed earlier by the present applicant.

  Briefly, this shelf structure is structured such that each shelf body is erected in the front-rear direction between four internal hollow columns with four racks erected at the four corners, and the left and right front columns and the left and right rear columns. A pallet can be placed between both side beam members arranged along the rear side, rear rear beam members arranged along the lateral direction between the two rear columns, and the upper end of each column. A rectangular shelf frame, and the shelf frame is formed by arranging a plurality of frame members in a substantially lattice shape.

  Each of the columns is formed in a prismatic shape with a substantially square cross section, and a bottom-like engagement protrusion having a spherical bottom surface is provided at each lower end of both columns on the front side. On the other hand, rectangular locking recesses that are locking portions into which the engaging protrusions of the shelf stacked on the upper side are fitted are formed at the upper end portions of both front columns.

In order to stack the shelves, the upper shelves lifted by the forklift above the lower shelves are positioned on the upper portions of the lower shelves, and the locking recesses of the front struts of the lower shelves are positioned. The upper and lower shelves are connected by fitting the engaging protrusions of the upper shelf to each other and fitting them from above. Thereby, a plurality of shelves can be stacked.
Japanese Patent Laid-Open No. 2001-3126, etc.

  However, in the conventional stackable shelf structure, each locking recess is formed in a concave shape with a single peripheral wall of a hollow column without any processing on the upper end of the column. Therefore, as described above, a plurality of upper shelves are stacked on the lower shelf, and a large load from heavy objects placed on the shelf frame of the shelf via each pallet is A large buckling load acts on each engagement recess of the lower support through each engagement protrusion of the support. Then, the large wall buckling load causes buckling deformation of the peripheral wall of the locking recess, and a concentrated load is generated on a part of the peripheral wall due to, for example, shaking of the upper shelf, etc. It is easy to generate | occur | produce and there exists a possibility that the upper end part of a support | pillar may be damaged.

  The present invention has been devised in view of the technical problems of the conventional stackable shelf structure, and ensures sufficient strength around the locking portion of the column to prevent cracking or breakage due to buckling load. The object is to provide a highly durable shelf structure that can be prevented.

The invention according to claim 1 is disposed along the front-rear direction between the hollow internal pillars erected at the four corners and the lower parts of the left and right pillars on the front side and the lower parts of the left and right pillars on the rear side. A shelf structure capable of stacking up and down a plurality of shelves each having a side beam member formed on the both sides and a rear beam member disposed in a lateral direction between the lower portions of the rear support columns. In addition, a convex engaging portion is provided at the upper end or lower end of both front struts, and each of the different shelves stacked above the upper end or lower end of both front struts A concave locking portion for engaging and locking the engaging portion is provided, and the concave locking portion is fixed to the upper end portion or the lower end portion of each column and the inside of the upper end portion or the lower end portion by welding. While being separated by the inner and outer double cylindrical portions with the inner cylindrical portion, the welded portion applied to the outer edge of the inner cylindrical portion, Serial when a stack of each shelf member, applied to the occurrence site of concentrated load applied from the upper side of the shelf side, further, the outer edge of the inner cylindrical portion, the inner shaft of each post than the opening edge of each strut The concave locking portion is formed in a stepped diameter by being offset at a predetermined position in the direction .

According to a second aspect of the present invention, a horizontal shelf frame is provided at the upper end of each column, and the front surface of the upper beam member that connects the upper ends of both columns on the front side of the shelf frame is substantially flush with the front surface. A reinforcing plate is straddled between the front surfaces of both front struts located on the front side.

The invention according to claim 3 is characterized in that the welded portion is provided between the inner cylinder portion and a support column which are located on the substantially opposite side of the reinforcing plate.

The invention according to claim 4 is characterized in that the welded portion is formed long along the front-rear direction of each column at a location where concentrated load is generated.

According to a fifth aspect of the present invention, the left and right front struts and the left and right side beam members are arranged at a left and right outer position than a lateral width of the left and right rear struts and a lateral width of the shelf frame. It is characterized by that.

The invention described in claim 6 is characterized in that a short support member having a predetermined height is provided on each of the front and rear upper surfaces of the left and right side beam members.

According to a seventh aspect of the present invention, the reinforcing plate is formed by punching a single plate that is bent at a substantially right angle from a long plate material, and the bending center line of the single plate is defined as a long plate material. It is characterized by being continuously punched in the longitudinal direction while being aligned along the center line in the width direction.

The invention according to claim 8 is characterized in that the inner and outer double cylindrical portions are each formed into a cylindrical shape by roll forming, and each bent butted facing edge is joined by welding, The butt facing edge position is offset in the circumferential direction.

  According to invention of Claim 1, the concave latching | locking part of the lower shelf which receives a load from the convex engaging part of the upper shelf stacked by the upper end part and inner cylinder part of the support | pillar Since it is separated by the inner and outer double step diameter parts and the welded part is applied to the part where the concentrated load is applied, the strength of the concave locking part becomes high and the seat on the upper peripheral wall of each lower column It is possible to sufficiently prevent the occurrence of bending deformation.

  As a result, even if a concentrated load is generated in a part of the locking portion, it is possible to reliably prevent the occurrence of cracks or breakage.

In particular, in this invention, the locking portion of the concave, since they are formed on the stepped condensation径状through the inner cylindrical portion, when said projecting engaging portion is fitted, and the engaging portion Can be easily fitted, and after the fitting , the distal end side of the engaging portion is supported in the holding state by the locking portion. For this reason, the stable connection state of the up-and-down support | pillar in an up-and-down shelf is obtained, and it becomes possible to prevent generation | occurrence | production of radial play.

According to the second aspect of the present invention, the strength of the entire lower shelf is increased because the strength of the connection between the lower support column and the upper beam member is improved by the reinforcing plate. This makes it possible to stably support the upper shelf.

According to the third aspect of the present invention, the strength of the entire concave locking portion is improved in combination with the reinforcing plate due to the unique formation position of the welded portion. That is, since the reinforcing function is exhibited by the welded portion, combined with the reinforcing effect of the reinforcing plate, the strength of the concave locking portion (the upper end portion of the lower support column) is improved.

According to the invention described in claim 4 , since the strength of the location where the concentrated load is generated is improved by the long welded portion, it is possible to effectively prevent the occurrence of buckling deformation due to a large load. Become. In addition, although the location which this welding part performs is not necessarily restricted to one place, when the said reinforcement plate is provided, it should just be formed in the location located in the other side.

According to the invention described in claim 5 , since the width length between the left and right front columns and the side beam members is larger than the width length between the shelf frame and the left and right rear columns, When not in use, the upper shelves can be sequentially stacked in the fitted state with respect to the lower shelves. As a result, it is possible to greatly reduce the storage space for many shelves when not in use.

According to the sixth aspect of the present invention, the strength of the side beam members can be increased by the support members, and when the shelves are stacked in the fitted state when not in use, The lower surfaces of both side beam members of the upper shelf are in contact with the upper surface of the support member, and a gap is formed between the two by the height of each support member. Therefore, forklift claws, for example, can be inserted using this gap, so that it is possible to easily stack the shelves when they are not in use or separate them when they are in use using forklifts. Become.

According to the invention described in claim 7, when a plurality of reinforcing plates are formed by punching from a long plate material, the bending center lines of the reinforcing plates are continuously provided along the width center line of the plate material. By punching, each can be formed into a so-called young leaf mark shape, so that it can be punched without a gap between adjacent reinforcing plates or with a slight gap. As a result, the yield of the plate material is improved and the material cost can be reduced.

According to the eighth aspect of the present invention, the load in the expanding direction applied to each of the facing edges can be dispersed by shifting the positions of the butted facing edges of the respective cylindrical portions in the circumferential direction. , The strength is improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a stackable shelf structure according to the present invention will be described in detail with reference to the drawings.

  1 to 7 show an embodiment of the present invention. In this stackable shelf structure, one shelf body 1 has four columns 2 to 5 erected at four corners, and left and right front sides. Both side beam members 6, 7 disposed along the front-rear direction between the lower portions of the two columns 2, 3 and the lower portions of the left and right both columns 4, 5, and both the rear columns 4, 5 The rear beam member 8 disposed along the horizontal direction between the lower edges of the two columns, and the shelf frame 9 fixed to the upper part of each of the columns 2 to 5, and the front columns 2, 3. An opening 11 is formed on the side to accommodate or take out the pallet 10 inside. Note that there is no shelf frame on the inner bottom surface, and the pallet 10 is directly placed on the ground.

  In order to reduce the weight, each of the pillars 2 to 5 is formed into an internal hollow prismatic shape by bending an iron-based metal plate, and the cross-sectional shape thereof is substantially the same. 3 is arranged outside the outer side surfaces of left and right vertical frame portions 9b, 9b, which will be described later, of the rear columns 4 and 5 and the shelf frame 9 by the width (W).

  Each of the side beam members 6 and 7 is integrally formed by the same molding method as each of the columns 2 to 5, and the rear column 4 is substantially the same as the width (W) of the front columns 2 and 3. 5 and the opposite surface of each rear end portion is fixed to both end edges of the rear beam member 8 by welding, while the front end edge is the front side as shown in FIG. The rear surfaces of the columns 2 and 3 are arranged with a gap C of about 30 mm. Note that blind plates 6a and 7a for preventing intrusion of water or the like are attached to the front end edge.

  Further, support members 12, 12, 13, and 13 having predetermined lengths are fixed to the front and rear upper surfaces of the side beam members 6 and 7, respectively, by welding. As shown in FIG. 3, the front support members 12 and 12 have front end edges fixed to the rear surfaces of the front support columns 2 and 3 by welding. Accordingly, the front end portions of the side beam members 6 and 7 are connected to the front support columns 2 and 3 via the support members 12 and 12. Further, a step is formed between the side beam members 6 and 7 due to the presence of the support members 12 to 13.

  The rear beam member 8 is integrally formed by the same molding method as each of the columns 2 to 5, and is arranged on the same plane as the rear columns 4 and 5, and the rear columns 4 and 5 are formed on the upper surfaces of both ends. The lower edge is fixed by welding.

  The shelf frame 9 is formed in a lattice shape, is disposed in the horizontal direction between the upper ends of the front columns 2, 3, and the left and right ends are welded and fixed to the opposing surfaces of the front columns 2, 3. Between the front side horizontal frame part 9a and both ends of the front side horizontal frame part 9a and the upper ends of the rear columns 4 and 5, the front and rear side frame parts 9a Between both side vertical frame portions 9b, 9b welded and fixed to the upper end edges of the rear columns 4 and 5, respectively, and the rear end portions of the both side vertical frame portions 9b, 9b. The left and right ends are arranged and fixed in the front-rear direction at the center in the width direction, and the rear side frame portion 9c welded and fixed to the upper ends of the rear columns 4 and 5 and the rear ends of the vertical frame portions 9b and 9b. The central vertical frame portion 9d and a pair of central horizontal frame portions 9e, 9e arranged and fixed at the front and rear positions in the vertical width direction are formed into a substantially flat shelf. It is. Further, the shelf frame 9 is set so that the surface area of the entire upper surface thereof is substantially the same as the surface area of the entire lower surface of the pallet 10 placed on the upper surface.

  Reinforcing plates 14 are respectively straddled between the front surface of each upper end portion of the front support columns 2 and 3 and the front surface of the front horizontal frame portion 9a that is flush with the front surface. Each reinforcing plate 14 is formed in a substantially bowl-shaped young leaf mark shape, and one end portion 14a extending in the vertical direction is fixed to the front surface of each front column 2 and 3 by welding, while extending in the horizontal direction. The extended other end 14b is fixed to the front surfaces of both ends of the front lateral frame portion 9a by welding.

  Further, as shown in FIGS. 3 to 5, convex engaging portions 15, 15 are attached to the lower ends of the front struts 2, 3. Each of the engaging portions 15 is integrally formed on the bottom side of the substrate 15a by integrally forming a metal plate by press molding and welding and fixing to the lower end edges of the front columns 2 and 3. The engaging projection 15b has a substantially U-shaped longitudinal section. In the substrate 15a, both side portions 15c and 15c are bent upward at a substantially right angle to strengthen the fixing force with the lower end edges of the front columns 2 and 3. On the other hand, the engaging protrusion 15b is formed flat in order to secure a stable seating property of the bottom surface 15d, and water that has entered the support columns 2 and 3 is discharged to the bottom at the bottom. A punching hole 15e is formed.

  Furthermore, in the upper end part of each said front side support | pillar 2 and 3, as shown in FIGS. 2-4, the said engaging parts 15 and 15 of the upper shelf 1 piled up are the concave shape which engages and latches. Locking portions 16, 16 are provided.

  Each of the locking portions 16 includes an outer cylindrical portion 2a, 3a formed by an upper end peripheral wall of the front support columns 2, 3, and an inner cylindrical portion 17, 17 inserted into the outer cylindrical portion 2a, 3a. The inner cylinder portions 15a and 15a are formed of a space portion that is separated from the upper end portion, and each of the inner cylinder portions 15a and 15a is a square metal tube having a cross-sectional shape similar to that of the outer cylinder portions 2a and 3a. The length is set to a predetermined length as shown in FIG. 2, and the predetermined position of the lower portion is fixed to each outer cylinder portion 2a, 3a by plug welding (P), thereby forming an internal / external double structure. It has a reinforcing function.

  Also, as shown in FIG. 8, the circumferential facing edges 2b and 3b of the outer tube portions 2a and 3a and the circumferential facing edges 17b of the inner tube portions 17 and 17 are mutually welded. The opposing edges 2b, 3b, and 17b are joined together, and the opposing edges 2b, 3b, and 17b are disposed at positions on the opposite sides in the circumferential direction, thereby increasing the strength in the expanding direction from the inside. Complementing each other, the strength is improved.

  Further, the upper end edge 17a of the inner cylinder part 17 is offset downward by a predetermined amount (L) from the upper end edges of the outer cylinder parts 2a and 3a, so that the inner cylinder part 17 can be easily fitted to the engagement part 15. As shown in FIG. 6, welding is performed at the four corners of the upper edge 17a so as to be coupled to the outer cylinders 2a and 3a. Among the welded portions, the three welded portions 18a to 18c on the reinforcing plate 14 side and the outer end side separated from the reinforcing plate 14 in the front-rear direction are spot-like spot welds. One welded portion 18d near the vertical frame portions 9b, 9b spaced apart from the plate 14 in the front-rear direction is long in the front-rear direction.

  That is, as shown in FIG. 2, the welded portion 18d is elongated horizontally from the substantially central position in the front-rear width direction of the inner cylindrical portion 17 toward both the vertical frame portions 9b, and further from the corner to the outer cylindrical portion 2a. 3a is extended to the rear side. That is, this part is the place where the concentrated load from the stacked upper shelf 1 is most easily received and the reinforcing effect of the reinforcing plate 14 cannot be sufficiently received.

  As shown in FIG. 1, as shown in FIG. 1, as shown in FIG. 1, the rear surfaces of the upper ends of the rear columns 4, 5, i. Stopper plates 19 and 19 for restricting rearward movement of the shelf 1 are fixed by welding. The stopper plate 19 is bent in a substantially L shape, and is fixed by welding so that the lower side portion 19a closes the upper end openings of the rear columns 4 and 5, so that the water into the columns 4 and 5 The upper side portion 19b that rises vertically exhibits a function as a stopper. As described above, each stopper plate 19, 19 has a shelf frame 9 whose surface area is substantially the same as the surface area of the pallet 10. Therefore, the stopper plates 19 and 19 are arranged at the rear positions so as to avoid the pallet 10 described above. Has been.

  In order to use the shelf 1 having the above structure, it is usually used in a two-stage stack as shown in FIG. 11, for example. At this time, the upper shelf 1 is lifted in advance by a forklift or the like. The rear side is overlapped on the upper part of the lower shelf 1 from the near side and slid rearward as it is. That is, the both ends of the lower cross beam member 8 of the upper shelf 1 are overlapped with the side frame portions 9b and 9b of the shelf frame 9 of the lower shelf 1, and the whole is slid rearward as it is. When the rear surfaces of both ends abut against the upper sides 19b, 19b of the stopper plates 19, 19 and further movement is restricted, when the front side of the upper shelf 1 is gradually lowered, the engagement protrusions 15b , 15b are fitted into the corresponding locking portions 16, 16, and both are engaged. Thereby, the connection operation | work to the upper shelf 1 with respect to the lower shelf 1 is easily complete | finished. Each shelf 1 can be stacked in three or more layers, in addition to two.

  Next, on the shelf frame 9 of the lower shelf 1, the pallet 10 on which the luggage is placed and fixed in advance is placed while being positioned by a forklift or the like.

  At this time, a large load of the load on the pallet 10 placed on the weight of the upper shelf 1 and the weight of the upper shelf 1 acts in the buckling direction on each of the columns 2 to 5 of the lower shelf 1. However, the front struts 2 and 3 to which particularly large loads are applied are sufficiently reinforced by the reinforcing effect of the reinforcing plates 14 and 14 on the front side. That is, the strength of the entire lower shelf 1 is increased because the strength of the connection between the front struts 2 and 3 of the lower shelf 1 and the upper horizontal frame portion 9a is improved by the reinforcing plates 14 and 14. As a result, the upper shelf 1 can be stably supported.

  Moreover, each latching | locking part 16 has high intensity | strength by the double structure of each outer cylinder part 2a, 3a and 17,17. And since the long welding part 18d is given to the specific site | part of the outer cylinder parts 2a and 3a to which a concentrated load acts, the intensity | strength of this site | part is also high enough. For this reason, it becomes possible to sufficiently prevent the occurrence of buckling deformation with respect to the peripheral wall of the upper end portion of each front column 2, 3 of the lower shelf 1, that is, the outer cylindrical portions 2 a, 3 a. As a result, even if a concentrated load is generated in a part of each locking portion 16 (specific portions of the outer cylinder portions 2a and 3a), the welded portion 18d can reliably prevent the occurrence of cracks and breakage. As a result, the durability of each shelf 1 as a whole can be significantly improved.

  Further, since the locking portions 16 and 16 are formed in a stepped diameter reduced shape through the inner cylinder portions 17 and 17, the engaging protrusions 15b and 15b of the engaging portions 15 and 15 are respectively locked. When engaged with the portions 16, 16, the lower end portions of the respective engaging projections 15 b, 15 b are supported in the holding state by the respective locking portions 16, 16. For this reason, the stable connection state of the upper and lower columns 2, 2, 3, 3 in the upper and lower shelves 1, 1 can be obtained, it is possible to prevent the occurrence of radial play, and it can be removed even by vibration such as an earthquake. There is no.

  Next, when each shelf 1 is not used, the upper shelf 1 stacked in a plurality of stages by a forklift or the like is removed from the lower shelf 1 and overlapped (nested) to a predetermined place such as a warehouse. In this embodiment, the widths of the front columns 2 and 3 and the side beam members 6 and 7 are larger than the width between the shelf frame 9 and the rear columns 4 and 5. Therefore, as shown in FIG. 12, it is possible to sequentially stack the upper shelves 1 to the lower shelves 1 in a fitted state. As a result, it is possible to greatly reduce the storage space for many shelves 1 when not in use.

  Further, in this embodiment, the strength of the side beam members 6 and 7 can be increased by the four support members 12 to 13, and as described above, each shelf 1. When stacked in the fitted state, the lower surfaces of the side beam members 6 and 7 of the upper shelf 1 are in contact with the upper surfaces of the support members 12 to 13, and the height of the support members 12 to 13 is between them. Only a gap S is formed. Therefore, forklift claws can be inserted using the gap S, for example, so that the racks 1 can be easily stacked and separated at the time of use by one person using the forklift. It becomes possible to do.

  In this embodiment, since the maximum backward movement of the upper shelf 1 with respect to the lower shelf 1 can be restricted by the two stopper plates 19, 19, the assembly work of the upper shelf 1 is easy. Become.

  As a method for forming the plurality of reinforcing plates 14, conventionally, the reinforcing plate 14 'is formed in an approximately L shape as shown in FIG. In this conventional example, since the shape of the reinforcing plate 14 'is formed in a simple L-shape, when these are successively punched sequentially, The reinforcing plate 14 ′ is taken out from a substantially square portion. For this reason, after punching, a square-shaped residual portion 20a 'having a relatively large area indicated by hatching in the drawing remains. For this reason, the yield of the material has deteriorated, and the material cost has been inevitably increased.

  On the other hand, as shown in FIG. 9, each reinforcing plate 14 in the present embodiment is formed by punching from a single long and narrow metal plate 20 by press molding. As described above, the bent center line Q between both end portions 14a and 14b of the single plate 20 is continuously punched with a slight gap in the longitudinal direction while being aligned with the center line Q1 of the width of the long plate material. It is what I did. For this reason, the yield of the material of the metal plate 20 becomes very good, and the material cost can be greatly reduced.

  Moreover, in this embodiment, since the engagement protrusions 15b and 15b are provided in each lower end part of the front side support | pillars 2 and 3, and the upper surface of the shelf frame 9 is formed flat, the shelf 1 Even when a pallet is placed on the upper surface or a load is placed, the upper surface space can be effectively used without being disturbed.

  Furthermore, since each engaging part 15 and 15 was provided in the lower end part side rather than providing in the upper end part of each support | pillar 2 and 3, each shelf 1 was arranged in the horizontal direction as shown, for example in FIG. This is also effective when the luggage 21 is directly placed across the upper surfaces of the two shelves 1 and 1.

  Furthermore, as shown in FIG. 14, the stacking pattern of each shelf 1 spans the two shelf frames 9, 9 via the pallet 10 on the upper surface of the upper shelf 1 of the two-tiered shelf 1, 1. It is also possible to place the luggage 21.

  The present invention is not limited to the configuration of the above-described embodiment. For example, the engaging portions 15 and 15 are provided on the upper end side of the front columns 2 and 3, and the locking portions 16 and 16 are provided on the front columns 2 and 3. It is also possible to provide it on the lower end side. Moreover, it is also possible to give each welding part 18a-18d over the perimeter of the upper end edge 17a of the inner cylinder part 17, and in this case, sufficient outer cylinder part 2a, for example, without providing the said reinforcement plate 14, It becomes possible to ensure the strength of 3a.

  In addition, the present invention can be used as a small shelf used in, for example, a close-in.

It is a perspective view of the shelf provided for the embodiment of the present invention. It is a principal part perspective view of the same shelf. It is a principal part side view which shows the lower part side of the front side support | pillar of the same shelf. It is a partial cross section figure which shows the state which engages the engaging part of this embodiment with a latching | locking part. It is a bottom view of the latching | locking part with which this embodiment is provided. It is a principal part top view which shows one front side support | pillar and latching | locking part in this embodiment. It is a front view which shows the coupling | bonding state of the one front support | pillar and the front side frame part. It is a cross-sectional view which shows the fitting state of the outer cylinder part and inner cylinder part which are provided to this embodiment. It is a top view which shows the stamping molding state of the reinforcement plate provided to this embodiment. It is a top view in the stamping molding state of the reinforcement plate in the past. It is a perspective view which shows the state which piled up the shelf provided for this embodiment in two steps. It is a perspective view which shows the state which piled up each shelf at the time of non-use. It is a perspective view which shows the state which arranged the shelf in parallel and mounted the load. It is a front view which shows the state which piled up each shelf 2 steps | paragraphs and mounted the load on the upper shelf.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Shelf body 2, 3 ... Front side support | pillar 2a, 3a ... Outer cylinder part 4, 5 ... Rear side support | pillar 6,7 ... Both-sides side beam member 8 ... Rear side beam member 9 ... Shelf frame 10 ... Pallet 14 ... Reinforcement plate 15 ... engagement part 15a ... substrate 15b ... engagement protrusion 16 ... engagement part 17 ... inner cylinder part 18a-18c ... weld part 18d ... long weld part 19 ... stopper plate 20 ... metal plate

Claims (8)

Internal hollow struts erected at the four corners, both side beam members disposed along the front-rear direction between the lower portions of the left and right struts on the front side and the lower portions of the left and right struts on the rear side, A rear beam member disposed along the lateral direction between the lower portions of both rear struts, and a shelf structure capable of stacking a plurality of shelves up and down,
Protruding engagement portions are provided at the upper end portions or lower end portions of the front support columns, and the engagements of the different shelves stacked on the upper end portions or the lower end portions of the front support columns. Provide a concave locking part where the part is fitted and locked,
The concave locking portion is separated by an inner / outer double cylindrical portion by an upper end portion or a lower end portion of each column and an inner cylindrical portion fixed by welding to the inside of the upper end portion or the lower end portion,
When the welded portion applied to the outer edge of the inner cylinder portion is stacked on each shelf body, it is applied to the site of occurrence of concentrated load received from the upper shelf side,
Furthermore, the fact that the outer edge of the inner cylinder part, the offset placed in a predetermined position of the inner shaft direction of each strut than the opening edge of each strut, and the recessed retaining portion is formed on the step径状 A stackable shelf structure. A horizontal shelf frame is provided at the upper end of each support column, and the front surfaces of the upper beam members that connect the upper end portions of both support columns on the front side of the shelf frame and the front support columns that are substantially flush with the front surface. A stackable shelf structure according to claim 1 , wherein a reinforcing plate is straddled between the two . The stackable shelf structure according to claim 2, wherein the welded portion is provided between the inner tube portion and a support column that are positioned on the substantially opposite side of the reinforcing plate . The stackable shelf structure according to any one of claims 1 to 3, wherein the welded portion is formed long along the front-rear direction of each support column at a location where concentrated load is generated . The left and right front struts and the left and right side beam members are arranged at a laterally outer position than a lateral width of the left and right rear struts and a lateral width of the shelf frame . 5. The stackable shelf structure according to any one of 4 above. 6. The stackable shelf structure according to claim 5, wherein a short support member having a predetermined height is provided at the front and back positions of the left and right side beam members . The reinforcing plate is formed by punching a single plate bent at a substantially right angle from a long plate material, and the bending center line of the single plate is set along the center line in the width direction of the long plate material. The stackable shelf structure according to any one of claims 2 to 6, wherein the shelf structure is formed by continuous punching in the longitudinal direction . The inner and outer double cylindrical portions are each formed into a cylindrical shape by roll forming, and each bent butted facing edge is joined by welding, and each butted facing edge position of each of the tubular portions is set in the circumferential direction. The stackable shelf structure according to any one of claims 1 to 7, wherein the shelf structure is offset .

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