WO2013081489A1

WO2013081489A1 - Pipe of square or rectangular section and made of sheet material

Info

Publication number: WO2013081489A1
Application number: PCT/RU2012/000444
Authority: WO
Inventors: Владимир Фадеевич ВЕСЕЛОВ
Original assignee: Veselov Vladimir Fadeevich
Priority date: 2011-11-28
Filing date: 2012-06-07
Publication date: 2013-06-06

Abstract

The invention relates to the field of producing metal structures from bent metal pipes. A pipe comprises a left wall (1) and a right wall (2), the upper parts of which walls are bent back to form an upper flange (3) and the lower parts of which walls are bent back to form a lower flange (4). The walls have two interlinked bends (6) and (7) of the same height, forming a projection (5) directed into the interior of the pipe. At the walls, the bend (6) is formed by the side of the steel sheet or strip emerging from the upper flange, and is directed upwards parallel to the walls. The bend (7) is formed by the side of the sheet or strip emerging from the lower flange (4), and is directed downwards parallel to the walls. A longitudinal channel (8) directed upwards and a longitudinal channel (9) directed downwards are formed within the bends. The bent-back sides are mounted in the longitudinal channels and form a self-contained lock joint in the form of a "flat seam". The invention provides for an increase in the strength, rigidity and durability of the structure and in the reliability of the joint during production of a pipe.

Description

A pipe of square or rectangular section made of sheet material.

The invention relates to the production of metal structures for a greenhouse with power structures from bent metal pipes having a closed cross section, as well as for the manufacture of other metal structures by bending by the method of intensive deformation of the material.

Of the analogues of the prior art, the closest technical solution to the technical solution of the present invention is a pipe, mainly of sheet roll material, containing at least one wall (RS N 529335, MKI F 16 L 9/02 application for invention Ν "2023544/08 of 05/12/1974, authors: V. Kochanov, D. Behilin, P.A. Dolinsh, applicant: Latvian Research Institute of Hydrotechnics and Land Reclamation, published in newsletter Ne 35 from 16.12.

1976).

The disadvantages of the prototype solution are:

1. Less strength, rigidity and durability of the structure and the reliability of its connection upon receipt of the pipe.

2. The complexity of the technology of manufacturing pipes from sheet roll material.

EFFECT: increased strength, rigidity, and durability of a structure and reliability of its connection when producing a pipe, as well as simplification of the pipe manufacturing technology in comparison with the invention adopted as a prototype, by a pipe, mainly from sheet web material containing at least one wall , in the claimed invention is achieved in that the pipe is made of square or rectangular cross-section by bending from a steel sheet or tape, containing the upper and lower shelves and two side said walls ki, wherein one from one of the said walls there are two bends of equal height, paired with each other, with the formation of a longitudinal said protrusion directed into the inside of the pipe, while one of the said bends are made by the side of a steel sheet or strip extending from the upper shelf parallel to the wall , with the formation of a longitudinal channel directed to the top, made between its sides, and the second said bending is made by the side of a steel sheet or tape, coming from the aforementioned lower shelf and directed parallel to downward, with the formation of a downwardly directed longitudinal channel made between its sides, the side of a steel sheet or strip of said bending downwardly mounted in said longitudinal bending channel directed to the top, lying snugly against it, and the side of the steel sheet or tapes of the said bending directed upward is installed in the said longitudinal bending channel directed downward, fitting snugly against it, with the formation of a closed connection such as a lock made in the form of a “Laying Seam”.

It is advisable that the above-mentioned two bends of equal height equal to each other, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam", are directed into the pipe and located on the wall in its middle part.

It is preferable that the two bent joints of equal height in height, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam", are directed inside the pipe and are located on the wall in its upper part.

It is advisable that the above-mentioned two bends of equal height equal to each other, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam”, are directed into the inside of the pipe and located on the wall in its lower part.

It is preferable that the above-mentioned two bends of equal height, forming a longitudinal protrusion and a closed joint a union of the type of lock, made in the form of a “Laying Seam”, was directed outwards of the pipe and located on the wall in its middle part.

It is advisable that the above-mentioned two bends of equal height equal to each other, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam", are directed outside the pipe and are located on the wall in its upper part.

It is preferable that the two bent joints of equal height in height, forming a longitudinal protrusion and a closed joint of the type of a lock made in the form of a “Recumbent Seam", are directed outward of the pipe and are located on the wall in its lower part.

It is advisable that on one of the said shelves on its inner side there are two bends of equal height interlocking with each other with the formation of a longitudinal protrusion directed into the inside of the pipe, while one said bend is made by the side of a steel sheet or strip emanating from the left-mentioned wall is directed parallel to the shelf to the left, with the formation of a left-directed longitudinal channel made between its sides, and the second mentioned bending is made by the side of a steel sheet or strip coming from the right of the wall and directed parallel to the shelf to the right, with the formation of a longitudinal channel directed to the right, made between its sides, and the side of the steel sheet or tape of the said bending directed to the right is installed in the said longitudinal bending channel directed to the left, tightly adjoining to it and the side of the steel sheet or tape of the said bending directed to the left is installed in the said longitudinal bending channel directed to the right, fitting snugly to it, with the formation of the mentioned closed joint A type of lock made in the form of a “Lying fold”.

It is preferable that the above-mentioned two interlocking equal in height bends, forming a longitudinal protrusion and a closed joint A lock-type unit made in the form of a “Lay Folding” was directed inside the pipe and located on a shelf in its left part.

It is advisable that the two bends of equal height in conjunction with each other, forming a longitudinal protrusion and a closed connection of the lock type, made in the form of a “Recumbent Seam”, be directed inside the pipe and located on a shelf in its middle part.

It is preferable that the two bent joints of equal height in height, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam", are directed 0-inward into the pipe and are located on a shelf in its right part.

It is advisable that the two bends, equal in height, paired with each other, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam”, are directed outward of the pipe and located on a shelf in its middle part.

] 5 It is preferable that the two bends of equal height, which are paired with each other, form a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam”, are directed outward of the pipe and are located on a shelf in its left part.

It is advisable that the above-mentioned two bends of equal height equal to each other, forming a longitudinal protrusion and a closed lock-type connection made in the form of a “Recumbent Seam”, are directed outside the pipe and are located on a shelf in its right part.

The technical result is an increase in the strength, rigidity and durability of the structure and the reliability of its connection in the manufacture of pipes in the claimed invention, in comparison with the technical solution adopted for the prototype, is achieved as follows.

In the technical solution adopted for the prototype, the pipe is folded in the manufacture of sheet metal roll so that the surfaces and faces contact each other, and the recesses located on the longitudinal edges of the sheet material are aligned. Such a connection is less strong, rigid and durable in comparison with the technical solution in the claimed invention, since the complex manufacturing technology does not ensure the accuracy of combining surfaces and faces with each other and located on the longitudinal edges of the sheet

5 terial recesses when folding the rolled material into a pipe.

In the claimed invention, a pipe made by bending by the method of intensive deformation of a square or rectangular cross section, mainly from a steel sheet or tape, has two bends of equal height in conjunction with each other, forming a longitudinal protrusion directed outward of the pipe and a closed connection such as a lock made in the form of a “Reclining Seam".

Such a closed pipe connection in the claimed invention, performed by bending by the method of intensive deformation, provides increased strength, rigidity and durability of the structure and reliable

15 of its connection when receiving the pipe, compared with the technical solution in the invention adopted as a prototype.

In the invention adopted as a prototype in the technology of manufacturing a pipe from sheet roll material, grooves and protrusions in the shape of a waffle are alternating in a staggered manner. Then on the surface

20 sheet material in the recess zone (on the lateral surfaces and bottom parts) perforate, fill the recesses with a reinforcing material, for example concrete, or filtering material working for compression, for example, with poroelast, and then the sheet material is folded so that the surfaces and the faces were in contact with each other, and the recesses,

25 located on the longitudinal edges, combined.

In the claimed invention, the manufacturing technology of the pipe is simpler, since a square or rectangular pipe from sheet material is made by bending by intensive deformation on one special equipment, mainly from steel tape or sheet in several transitions. The pipe is obtained by bending from sheet material by the method of intensive deformation of square and rectangular sections, which cannot be obtained with the equipment in the invention adopted as a prototype.

The invention is illustrated by drawings, which depict:

FIG. 1. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection of the lock type, made in the form of a “Lay Folding”, is directed into the pipe and is located on the wall in its middle part.

FIG. 2. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Recumbent Seam”, is directed into the pipe and is located on the wall in its upper part.

FIG. 3. A part of a pipe of rectangular cross section made of sheet material, the longitudinal protrusion of which, forming a closed joint of the lock type, made in the form of a “Laying Seam”, is directed into the pipe and is located on the wall in its middle part (front side view).

FIG. 4. A rectangular pipe made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Lay Folding”, is directed into the pipe and is located on the wall in its middle part.

FIG. 5. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Lay Folding”, is directed outside the pipe and is located on the wall in its upper part.

FIG. 6. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Laying Seam”, is directed outside the pipe and is located on the wall in its middle part.

FIG. 7. A rectangular pipe made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, is made The first one is in the form of a “Laying Seam”, directed to the tube and located on the wall in its upper part.

FIG. 8. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock made in the form of a “Lay Folding”, is directed inside the pipe and is located on a shelf in its right part.

FIG. 9. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock made in the form of a “Recumbent Seam,” is directed into the inside of the tube and is located on a shelf in its middle part.

FIG. 10. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection of the lock type, made in the form of a “Lay Folding”, is directed outside the pipe and is located on a shelf in its right part.

FIG. 1 1. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection of the lock type, made in the form of a “Recumbent Seam", is directed outside the pipe and is located on the shelf in its middle part.

FIG. 12. A rectangular pipe made of sheet material, the longitudinal protrusion of which, forming a closed connection of the lock type, made in the form of a “Recumbent Seam", is directed inside the pipe and is located on a shelf in its right part.

FIG. 13. A pipe of rectangular cross section made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Recumbent Seam”, is directed into the pipe and is located on a shelf in its middle part.

FIG. 14. A rectangular pipe made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Recumbent Seam", is directed outside the pipe and is located on a shelf in its middle part. FIG. 15. A square tube made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Recessed Seam”, is directed inside the pipe and is located on the wall in its lower part.

5 FIG. 16. A rectangular pipe made of sheet material, the longitudinal protrusion of which, forming a closed connection such as a lock, made in the form of a “Lay Folding”, is directed outside the pipe and is located on the wall in its lower part.

SUMMARY OF THE INVENTION

The square or rectangular pipe made of sheet material is made by bending by the method of intensive deformation on special equipment of steel tape or sheet. The pipe contains a left wall 1 (Figs. 1-16) and a right wall 2 (Figs. 1-16). The upper part of the left wall 1 (Fig.1-16) and the right wall 2 (Fig.1-16) are bent to form

1 5 of the upper shelf 3 (Figs. 1-16), and the lower part of which is bent in to form the lower shelf 4 (Figs. 1-16). The wall 1 (Figs. 1-7, 15, 16) has two, bent with each other and equal in height, forming a protrusion 5 directed into the inside of the pipe (Figs. 1-7, 15, 16). Performed on the walls 1 (Fig. 2-7) or on the walls 2 (Figs. 1, 15, 16), the bending 6 (Figs. 1-7, 15, 16) is formed

20 steel sheet or tape emanating from the upper shelf 3 (Figs. 1-7, 15.16) and is directed parallel to the wall 1 (Figs. 2-7) or to the walls 2 (Figs. 1, 15, 16) up . The limb 7 (Figs. 1-7, 14, 15) on the wall 1 (Figs. 2-7) or on the walls 2 (Figs. 1, 15, 16) is formed by the side of the steel sheet or tape emanating from the lower shelf 4 (Fig. 1-7, 15, 16) and is directed parallel to the wall 1 (Fig.2-7)

25 or wall 2 (Fig. 1,15,16) down. Inside the bend 6 (FIGS. 1-7, 15, 16), between the parallel sides, a longitudinal channel 8 (FIGS. 1-7,15,16) is formed, directed upward. Inside the limb 7 (Figs. 1–7, 15, 16), a longitudinal channel 9 (Figs. 1–7, 15, 16), directed downward, is formed between the parallel sides. In the longitudinal channel 8 (Figs. 1-7,15, 16), zo directed upwards, a bent side downward is installed limb 7 (Fig.1-7, 15, 16) tightly adjacent to it. In the longitudinal channel 9 (Figs. 1-7, 15, 16), directed downward, an upwardly curved side of the steel sheet or bend strip 6 is installed (Figs. 1-7, 15, 16). The bent sides of the steel sheet or strip of each bend 6 (Figs. 1-7, 15,16) and 7 (Figs. 1-7, 15, 16) are installed with a snug fit in their longitudinal channels, respectively 9 (Fig. 1-7, 15, 16) and 8 (Fig. 1) form a closed connection lock made in the form of a “Swinging Seam”. It is preferable that two bends 6 and 7, conjugate with each other, equal in height (Figs. 1-7, 15, 16), forming a longitudinal protrusion 5 (Figs. 1-7, 15, 16) and a closed lock type connection made in The “lying fold” was directed inside the pipe and located on the wall 1 (Fig. 1, 3,4) in its middle part or in its upper part (Fig. 2) or on the wall 2 (Fig. 15) in its lower part. It is advisable that two bends 6 and 7, conjugate with each other, equal in height (Fig. 1-7.1 5, 16), forming a longitudinal protrusion 5 (Figs. 1-7, 15, 16) and a closed lock-type connection made in in the form of a “Recumbent Seam", were directed outside the pipe and are located on the wall 1 (Fig.6) in its middle part or in its upper part (Fig.5.7) or on the wall 2 (Fig.16) in its lower parts. On the upper shelf 3 (FIGS. 8-12, 14) or on the lower shelf 4 (FIG. 13), two bends 6 and 7, interfaced with equal height 20, can be made, forming a longitudinal protrusion 5 (Fig.8-14). Bending 6 (Figs. 8-14) is made by the side of a steel sheet or strip emanating from the left wall 1 (Figs. 8-14) and is directed parallel to the upper shelf 3 (Figs. 12-12, 14) and to the lower shelf 4 (Fig. 13) to the left, with the formation of a left-directed longitudinal channel 8 (Figs. 8-14), made between its sides. The second bend 7 (Fig.8-14) is made by the side of the steel sheet or strip emanating from the right wall 2 (Fig. 8-14) and is directed parallel to the upper shelf 3 (Fig.8-14) and the lower shelf 4 ( Fig. 13) to the right, with the formation of the right-directed longitudinal channel 9 (Figs. 8-14), made between its sides.

Moreover, the side of the steel sheet or bending tape 7 (Fig.8-14), lennogo to the right, is installed in the longitudinal channel 8 (Fig.8-14) of the bend 6 (Fig. 8-14) directed to the left, tightly fitting to it. The side of the steel sheet or bend strip 6 (Figs. 8-14) directed to the left is installed in the longitudinal channel 9 (Figs. 8-14) of the bend 7 (Figs. 8-14) directed to the right,

5 tightly adjacent to it, with the formation of a closed connection such as a lock made in the form of a “Laying Seam”.

It is preferable that two limbs 6 (Figs. 8-14) and 7 (Figs. 8-14), paired with each other, equal in height, forming a longitudinal elevation 5 (Figs. 8-14) and a closed lock-type connection made in in the form of a “Laying Seam", were directed into the inside of a square pipe located in the middle part on the upper shelf 3 (Fig. 9) or on the right side of the upper shelf 3 (Fig. 8), or were directed into the inside of a rectangular pipe, located in the middle part on the lower shelf 4 (Fig.13), or in the left or right side of the lower shelf (not shown).

15 Were directed into the pipe of rectangular cross-section, on the right side of the upper shelf 3 (Fig. 12), or on the left side, or the middle part of the upper shelf 4 (not shown in the drawing).

It is advisable that two bends 6, conjugated with each other, equal in height (Figs. 8-14) and 7 (Figs. 8-14), forming a longitudinal protrusion 5

20 (Fig. 8-14) and a closed connection of the lock type, made in the form of a “Left Seam”, were directed outside the square tube and are located in the middle part on the upper flange 3 (Fig. 1 1) or on the right side top shelf 3 (figure 10), or on the left side (not shown in the drawing). It is advisable that two paired with each other equal in height from

25 bend 6 (Fig.8-14) and 7 (Fig.8-14), forming a longitudinal protrusion 5 (Fig.

8-14) and a closed connection of the lock type, made in the form of a “Laying Seam”, were directed outside the pipe of rectangular cross section and are located in the middle part on the upper shelf 3 (Fig. 14) or on the right side of the upper shelf, or left side (not shown in the drawing).

zo Example of a square tube: The walls have a height of 25 mm, the width of the upper and lower shelves is 25 mm, the height of the longitudinal protrusion is 5.2 mm, the thickness of the workpiece material is 0.3 to 2 mm, the inner radii are 0.5 mm, the crescent length is 1 m, not more than 1 mm, and the limit angle deviation + _1 degrees.

5 Examples of execution of a pipe of rectangular cross section.

1. The walls have a height of 28 mm, the width of the upper and lower shelves is 25 mm.

2. The walls have a height of 40mm, the width of the upper and lower shelves is 20mm.

3. The walls have a height of 40 mm, the width of the upper and lower shelves is 25 mm.

4. The walls have a height of 40 mm, the width of the upper and lower shelves is 28 mm. 5. Walls have a height of 50 mm, the width of the upper and lower shelves is 25 mm.

6 The walls have a height of 60 mm, the width of the upper and lower shelves is 30 mm, Two bends 6 and 7 conjugated with each other, equal in height, forming a longitudinal protrusion 5 and a closed lock-type connection made in the form of a “Laying Seam”, can be directed into the pipe and races

15 are laid on the wall in its middle part or in its upper part or in its lower part, and can also be directed outside the pipe and located on the wall in its middle part or in its upper part or in its lower part . In addition, two bends 6 and 7, which are paired with each other and equal in height, forming a longitudinal protrusion 5 and a closed connection of the “0-LOCK” type, made in the form of a “Laying Seam”, can be directed into the inside of a square or rectangular pipe in and located the upper flange 3 or lower flange 4 pipes of square or rectangular cross section in the middle part or in the right part or left part, and can also be directed outward pipes of square or rectangular cross section and are located on the upper flange 3 or lower flange 4 on Wednesdays part of it either on the right side or on the left side. In all cases, the height of the longitudinal protrusion is 5.2 mm, the thickness of the workpiece material is from 0.3 mm. up to 2 mm., internal radii 0.5 mm, crescent shape along the length of 1 m, not more than 1 mm, and the maximum deviation of angles + _1 degrees. This embodiment of a square and rectangular pipe allows you to get an element that The required strength parameters allow us to expand the range of its use in the design of the greenhouse in various combinations and combinations, as well as in the manufacture of other metal structures.

In the claimed invention, a square or rectangular pipe

5 sections is made in wolves by the method of intense deformation.

In the manufacture of pipes from sheet roll material in wolves by traditional profiling, as in the invention adopted as a prototype, monotonous tension of the workpiece is carried out. In the manufacture of a square or rectangular pipe from sheet material in wolves by the method of intensive deformation, the preferred scheme for the deformation of bent elements is the alternating deformation of the workpiece.

In the manufacture of pipes from sheet roll material in wolves by traditional profiling, the mode of forming the bend radius is smooth — 1 5 transitions.

In the manufacture of square or rectangular pipes from sheet material in wolves by the method of intensive deformation, the mode of forming the radius of the bend is constant in transitions.

In the manufacture of pipes from sheet web material in wolves0 by traditional profiling, additional forces are not applied.

In the manufacture of square or rectangular pipes from sheet material in wolves, axial and tangential additional forces are applied by the method of intensive deformation.

In the manufacture of pipes from sheet web material in wolves 5, traditional profiling uses an open gauge with release.

In the manufacture of square or rectangular pipes from sheet material in wolves, a closed gauge is used by the method of intensive deformation.

In the manufacture of pipes from sheet roll material in wolves with traditional profiling, the correct device is not necessary.

When manufacturing a square or rectangular pipe from sheet material in wolves by the method of intensive deformation, the correct device is necessary.

The considered method of forming by intensive deformation differs significantly in the preferred schemes of deformation of bent elements. In traditional profiling, the longitudinal and bending deformations are insignificant (actually at the boundary of the elastic-plastic region. In the intensive deformation method, the longitudinal deformation is slightly higher and is alternating: in the zone in front of the axial plane of the rolls, this is tensile deformation, and beyond the axial the plane of the rolls is the compression strain, and the compression strain is ensured by changing the angle of exit of the workpiece from the gauge.

With intensive shaping, the neutral strain layer practically coincides with the middle line, while in the traditional profiling, the neutral strain layer shifts to the inner contour of the bend zone. It follows that in the manufacture of pipes in rollers by the method of intense deformation, the outer contour of the bend zone is unloaded, which allows for smaller bending radii without destroying the workpiece.

The method of intensive deformation is most effective in medium and small batch production due to the smaller number of transitions than with traditional profiling in rolls. With traditional profiling and tight bending, the profiles have a high level of residual stresses, reaching (05 ... 0.8) Simga, in case of unfavorable schema formation.

Claims

Claim.

one . A square or rectangular pipe from sheet material containing at least one wall, characterized in that the pipe is square or rectangular by bending from a steel sheet or tape, contains an upper and lower shelf and two side said walls, moreover, on one of said walls there are two bends of equal height interconnected to form a longitudinal said protrusion directed into the inside of the pipe, wherein one said bend is made by the side of a steel sheet or a tape starting from the upper shelf is directed parallel to the wall upwards, with the formation of a longitudinal channel directed to the top, made between its sides, and the second mentioned folding is made by the side of the steel sheet or tape coming from the said lower shelf and directed parallel to the wall downward, with the formation of a downwardly directed longitudinal channel made between its sides, the side of the steel sheet or the tape of said bending downwardly mounted in said longitudinal bending channel aligned to the top, fitting tightly to it, and the side of the steel sheet or strip of said bend directed to the top is installed in said longitudinal bending channel directed downward, adhering tightly to it, with the formation of a closed joint such as a lock made in the form of Seam ".

2. A square or rectangular pipe made of sheet material according to claim 1, characterized in that the two mentioned are interlocked with equal bending heights, forming a longitudinal protrusion and a closed connection such as a lock, made in the form of a “Recumbent Seam”, were directed inside the pipe and located on the wall in its middle part.

3. A pipe of square or rectangular cross section made of sheet material according to claim 1, characterized in that the said two conjugate equal in height bending, forming a longitudinal protrusion and closed

SUBSTITUTE SHEET (RULE 26) This connection, such as a lock made in the form of a “Recumbent Seam,” was directed inside the pipe and located on the wall in its upper part.

4. A square or rectangular pipe made of sheet material according to claim 1, characterized in that the two mentioned are interlocked with equal bending heights, forming a longitudinal protrusion and a closed connection such as a lock made in the form of a “Laying Seam”, were directed inside the pipe and located on the wall in its lower part.

5. A square or rectangular pipe made of sheet material according to claim 1, characterized in that the two mentioned are paired with equal bending heights, forming a longitudinal protrusion and a closed connection such as a lock made in the form of a “Recumbent Seam”, were directed outside the pipe and located on the wall in its middle part.

6. A square or rectangular pipe made of sheet material according to claim 1, characterized in that the two mentioned are paired with equal bending heights, forming a longitudinal protrusion and a closed connection such as a lock made in the form of a “Recumbent Seam”, were directed outside the pipe and located on the wall in its upper part.

7. A pipe of square or rectangular cross section made of sheet material according to claim 1, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock, made in the form of a “Recumbent Seam”, were directed outside the pipe and located on the wall in its lower part.

8. A square or rectangular pipe made of sheet material, characterized in that on one of the said shelves on its inner side there are two bends of equal height in conjunction with each other with the formation of a longitudinal protrusion directed into the inside of the pipe, wherein one said bend made by the side of the steel sheet or strip emanating from the left mentioned wall is directed parallel to the shelf to the left, with the formation of a left-directed longitudinal channel made between its sides, and the second mentioned bend made by steel side-

SUBSTITUTE SHEET (RULE 26) a sheet or strip extending from the right-hand wall and is directed parallel to the shelf to the right, with the formation of a right-directed longitudinal channel made between its sides, the side of the steel sheet or tape of the said bending directed to the right installed in the said longitudinal bending channel directed to the left, tightly adhering to it, and the side of the steel sheet or strip of said bending of the left side is installed in said longitudinal bending channel directed to the right, tightly adjoining to it, with the formation of the aforementioned closed connection of the type a lock made in the form of a “Recumbent Seam”.

9. A square or rectangular pipe made of sheet material according to claim 8, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock made in the form of a “Recumbent Seam”, were directed inside the pipe and located on a shelf in its left part.

10. A pipe of square or rectangular cross-section made of sheet material according to claim 8, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock made in the form of a “Recumbent Seam”, were directed into the inside of the pipe and located on a shelf in its middle part.

1 1. A square or rectangular pipe made of sheet material according to claim 8, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock, made in the form of a “Recumbent Seam” , were directed inside the pipe and located on a shelf in its right side.

12. A square or rectangular pipe made of sheet material according to claim 8, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock, made in the form of a “Recumbent Seam”, were directed outside the pipe and located on a shelf in its middle part.

SUBSTITUTE SHEET (RULE 26)

13. A square or rectangular pipe made of sheet material according to claim 8, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock, made in the form of a “Recumbent Seam”, were directed outside the pipe and located on a shelf in its left.

14. A square or rectangular pipe made of sheet material according to claim 8, characterized in that said two conjugated equal in height bends, forming a longitudinal protrusion and a closed connection such as a lock, made in the form of a “Recumbent Seam”, were directed outside the pipe and located on a shelf in its right side.

SUBSTITUTE SHEET (RULE 26)