JP2007154523A - Small diameter steel pipe made of checkered steel plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and inexpensively provide a small diameter steel pipe for use mainly in applications needing slip prevention. <P>SOLUTION: This small diameter steel pipe made of a checkered steel plate has an outer diameter of 85 mm or less and is manufactured by an electro-resistance-welded pipe manufacturing facility using the checkered steel plate formed with a large number of protrusions on the surface by rolling, i.e., passing between rolls with grooves of a grated pattern or the like indented. The small diameter steel pipe 1 made of the checkered steel plate can be used for a frame member or the like in a frame structure constructed using pipes as frame members. The small diameter steel pipe 1 can be used for various other applications such as a handrail or a post for a prefabricated scaffolding or a single pipe scaffolding, and since there are a large number of protrusions 2 on the pipe surface, the pipe is not slippery when gripped in hand. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a steel pipe having a small diameter, which is manufactured using a striped steel plate and is suitable mainly for use in preventing slippage.

  Steel pipes mainly used for construction, civil engineering and the like are manufactured from steel plates with flat surfaces in the case of welded steel pipes with joints. These types of steel pipes with large diameters are used for steel pipe piles, steel pipe sheet piles, low-rise steel structure building supports and others, but the outer diameter of steel pipe piles is generally large, and Table 4 of JIS A 5525 Is 318.5 to 2000 mm (thickness 6.9 to 25 mm), and even if it is actually used, it is usually 114.3 mm or more and at least 89.1 mm.

  In addition, for example, a small-diameter steel pipe having an outer diameter of 42.7 mmφ is widely used as a frame material (post, arm, handrail) for temporary scaffolding such as a frame scaffold or a single pipe scaffold. Conventionally, a simple round steel pipe having a flat surface has been used as a steel pipe used for a frame material of a frame scaffold or a single pipe scaffold.

As described above, the steel pipe used for the frame material of the scaffold has a flat surface, but in the case of a steel pipe pile or a steel pipe sheet pile, there is one using a steel pipe made of a striped steel plate (see Patent Documents 1 to 3). ).
In addition, in what used the steel pipe of the striped steel plate for the main body of a steel pipe pile or a steel pipe sheet pile (patent documents 1, 2), the effect | action which increases the friction with respect to the ground is utilized.
Moreover, in what was used as the steel pipe for joints which connect a concrete pile (refer patent document 3), the uneven surface of a striped steel plate is made into the inner surface of a steel pipe, and it is ensured that the bond strength with the concrete with which the steel pipe was filled is ensured. We are using.
JP2001-90061 Japanese Utility Model 1-147040 Shokai 60-162132

As described above, normal round steel pipes with a flat surface are used for the steel pipes for the frame material of the temporary scaffolding, but there is a risk of hand slipping when an operator moves by placing his / her hand on a column or handrail. I can't say it isn't. In the case of steel pipe piles, steel pipe sheet piles, etc., there is no problem that the operator hangs hands and slips, but there is the above problem when used as a frame material for a temporary scaffold.
Also, unlike large-diameter pipes used for steel pipe piles and steel pipe sheet piles, small-diameter steel pipes are connected to pipes or other members, such as used for the framework of a temporary tent or used for the struts that make up an assembly shelf. In many cases, the frame is used as a frame material in a structure to be constructed. In such a case, the structure may not be stable due to slippage in the joint part between pipes or the joint part between the pipe and another member.
In addition to the temporary scaffold, there are many cases where it is inconvenient that the hand is slippery when it is used for a handrail installed on a staircase of a station building or the like that can be grasped by other hands.

  The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and in the case of being used for various applications mainly requiring slip prevention, a small-diameter striped steel pipe that can be used inexpensively and easily for those applications. The purpose is to provide.

The small-diameter striped steel pipe of the present invention that solves the above-mentioned problem is a striped steel sheet having an outer diameter of 85 mm or less and formed with a large number of protrusions on the surface by rolling through a roll engraved with a groove such as a lattice pattern. It is manufactured by an electric sewing tube manufacturing facility.
A second aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the first aspect is used as a frame member in a frame structure constructed using a pipe as a frame member.
A third aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the first aspect is used as a frame material in a temporary scaffold constructed using a pipe as a frame material.
A fourth aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the third aspect is used as a support in a temporary scaffold.
A fifth aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the third aspect is used as a handrail in a temporary scaffold.
A sixth aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the first aspect is used as a handrail provided along a staircase installed in a construction.
A seventh aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the first aspect is used as a horizontal rail of a ladder.
An eighth aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the first aspect is used as a pipe column in an assembly shelf in which a pipe column and a horizontal member are coupled with a coupling member and a shelf board is attached and assembled.
A ninth aspect of the present invention is characterized in that the small-diameter striped steel pipe according to the first aspect is used as a post for attaching a sign plate installed on the ground or a road surface.
A tenth aspect of the present invention is characterized in that the cross-sectional shape of the small-diameter striped steel pipe of any one of the first to ninth aspects is round or square.

According to the small-diameter striped steel pipe of the present invention, since it is a steel pipe manufactured from a striped steel plate and has a large number of protrusions on the surface, for example, a handgrip or a place where it may be grasped, such as a handrail or a column When used in the above, slip prevention is effectively achieved.
In addition, when it is necessary to connect the small diameter striped steel pipes of the present invention or the small diameter striped steel pipes and other members, a large number of protrusions on the surface can prevent the joints from slipping together. And a stable bonding state is maintained.
In addition, if the surface is provided with unevenness as a slip prevention measure for a normal steel pipe with a flat surface, it is complicated, extremely man-hours and extremely expensive, but in the present invention, a striped steel plate is used as a material. Since it can be used and manufactured in an electric resistance steel pipe manufacturing facility, it is easy, almost no increase in man-hours, and cost does not increase.

  Embodiments of the small-diameter striped steel pipe according to the present invention will be described below with reference to FIGS.

FIG. 1 (a) is a front view of a part of a small-diameter striped steel pipe of one embodiment of the present invention, and (b) is a cross-sectional view taken along the line AA of (b). This small-diameter striped steel pipe 1 has an outer diameter D of 85 mm or less, and is electrically sewn using a striped steel plate with a large number of protrusions formed on the surface by rolling through a roll having grooves such as a discontinuous lattice pattern. It is manufactured by a pipe manufacturing facility. A number of protrusions formed on the surface are denoted by reference numeral 2.
As described above, the striped steel sheet is a steel sheet in which a large number of protrusions are formed on the surface by rolling through a roll having grooves such as a discontinuous lattice pattern, and the pattern of the protrusion array is shown in FIG. In general, a striped steel pipe shown in FIG. 1 has a discontinuous lattice pattern in which oblique short ridges (projections) 2 are regularly arranged in directions orthogonal to each other, such as the striped steel plate 3A. Although 1 uses this striped steel plate 3A, there are other various striped patterns and is not particularly limited.
ERW pipe manufacturing equipment is equipment that presses and presses the butt squeeze roll by energizing and heating the abutted material edge after the belt plate is bent into a circle with an ERW pipe forming machine using the cold roll forming method, A general electric sewing tube manufacturing facility can be used. In addition, as a forming roll, it is not necessary to use the roll especially for a striped steel plate, and a normal roll for round steel pipe forming can be used.

The Example which used said striped steel plate steel pipe 1 for the scaffold for temporary construction comprised with the round steel pipe is shown to FIG. The illustrated scaffold is a so-called frame scaffold 10 constructed by framing with a building frame 11, a fabric frame 12, a cross brace 13, and the like that are made of steel pipes, and a scaffold plate 14 is attached. A striped steel pipe 1 can be used.
For example, in FIG. 2, the above-described striped steel pipe 1 can be used as a handrail 16 provided along the stairs (elevating jetty) 15 or a frame-shaped handrail 17 provided along the scaffolding plate 14. Moreover, in FIG. 3, said striped steel pipe 1 can be used as the horizontal protective frame 18 provided in a channel | path end (side edge of the frame scaffold 10).

As described above, when the striped steel pipe 1 is used as a frame material to be grasped by hand, such as the handrail 16 of the staircase, the handrail 17 of the passage, or the protection frame 18 at the end of the passage, Since the protrusions 2 arranged in large numbers increase the friction, it is difficult to slip and safety is improved. Workers often work with gloves, but this is particularly effective in preventing slipping in such cases.
Moreover, since the support | pillar part (building site part) 11a of the building frame 11 may also be grasped by hand, it is also effective to use this support | pillar part 11a as the striped steel pipe 1.
If a large number of protrusions are formed on the surface of a simple round steel pipe as an anti-slip measure, it is extremely complicated, man-hours and extremely expensive, but in the present invention, a striped steel plate is used as the material. Since it is manufactured with a sewn steel pipe manufacturing facility, it is easy to manufacture a steel pipe having a large number of protrusions on the surface, and the man-hour is hardly increased and the cost is not increased.
In addition, according to the method of forming the protrusions by rolling through a grooved roll, it is possible to form protrusions with relatively rounded corners rather than sharp edges, so pipes that are gripped by hand Appropriate protrusions can be obtained as protrusions to be provided on the surface.
Furthermore, since a normal round tube forming roll is used as the forming roll of the roll forming machine, when the striped steel sheet is curved and formed into a circular shape, the protrusions of the striped steel sheet are pushed in by the roll surface, and the height relative to the smooth surface of the steel pipe The height of the protrusions is small but low. In this way, the protrusion is slightly pushed in and the height is slightly lowered, so that an uneven surface that gives moderate friction is formed as a tube surface to be gripped by hand. Also, during roll forming, the corners of the protrusions of the striped steel plate are slightly crushed under the pressure of the roll, so the corners of the protrusions are also relatively rounded corners at this point, and the surface of the pipe gripped by hand As a protrusion provided on the surface, a more appropriate protrusion can be obtained.

A ladder 20 as shown in FIG. 4 may be used as a temporary scaffold, but the above-described striped steel pipe 1 can be used as a cross 20 a of the ladder 20.
When climbing up and down the ladder 20, the cross 20 a made of the striped steel pipe 1 is effective for preventing slippage as described above.
In addition, since the pillar 20b part of the ladder 20 may be grasped by hand, the striped steel pipe 1 may be used for the pillar 20b.

As a temporary scaffold using a steel pipe, although not shown in the figure, there is a so-called single pipe scaffold (or pipe scaffold) constructed by connecting single pipes that are simple round steel pipes via, for example, orthogonal clamps. The said striped steel pipe 1 can be used as a single pipe in a single pipe scaffold.
In this case, for example, when it is used for a column part (building site) that is often grasped by hand, it is effective for preventing slipping as described above. Further, for example, when connecting single pipes via a clamp, the clamp Since there is the protrusion 2 on the surface of the single pipe (stripe steel plate steel pipe 1), it is easy to firmly hold the single pipe 1 without slipping.

As shown in FIG. 5, for example, the striped steel pipe 1 can be used as the handrail 31 provided along the stairs 30 installed in a construction such as a station building.
Also in this case, the striped steel pipe 1 (handrail 31) having a large number of protrusions on the surface can effectively prevent slipping.
Applicable handrails include not only handrails of buildings but also handrails installed in various constructions including civil engineering structures. Moreover, it is not necessarily limited to the handrails installed along the stairs, but can be applied to various handrails. For example, a fence-like handrail installed on a flat ground in a park or a square is included.
Moreover, when providing a handrail or enclosure with a freight car, a railway freight car, etc., the striped steel pipe 1 can also be used for those handrail or enclosure. Furthermore, it can also be used for a handle portion in a hand-held type cart.
The shape of the handrail is not particularly limited, and various forms are possible.

Moreover, said striped steel pipe 1 can be used for the assembly shelf which couple | bonds a pipe support | pillar and a horizontal material with a coupling member, attaches a shelf board, and assembles. FIG. 6 shows an example of such an assembly shelf 40. In this assembly shelf 40, a horizontal member 41, a coupling member 42, and a shelf plate 43 are integrated, and the above-described striped steel pipe 1 is used as a pipe support 44.
As shown in FIG. 7, the coupling member 42 has a cylindrical shape into which a pipe support 44 that is a striped steel pipe 1 is fitted, and a fixing bolt 45 screwed into a screw hole 42 a formed in the coupling member 42. Is screwed and tightened, the shelf plate 43 is fixed horizontally to the pipe support 44. In this case, the protrusion 2 on the surface of the pipe column 44 (stripe steel plate steel pipe 1) becomes a slip stopper with respect to the fixing bolt 45, and the engaging member 42 is firmly engaged with the pipe column 44, and the shelf plate 43 may slide down. There is no.
In this way, a rigid coupling mechanism can be realized easily and inexpensively with a simple structure in which the striped steel pipe 1 is used for the pipe support 44.
The illustrated engaging member 42 is merely an example, and engaging members having various structures can be employed.
The shelf plate 43 may be a separate member from the horizontal member 41 and the engaging member 42.

As shown in FIG. 8, it can also be used for the column 51 of the coat hanger 50 whose height can be adjusted. That is, the support column 51 includes a large-diameter lower support column 52 and an upper support column 53 fitted into the lower support column 52, and a fixing bolt 55 screwed into a screw hole 52a formed in the lower support column 52 is screwed and tightened. Then, the upper column 53 is fixed at a predetermined height position. 56 is a hanger rail that is integrally stretched between the upper ends of the upper columns 53 on both sides, 57 is a member that integrally connects the lower columns 52 on both sides, and 58 is a base. The striped steel pipe 1 can be used as the upper column 53.
The fixing mechanism by the fixing bolt 55 is substantially the same as the fixing mechanism of FIG. The protrusions 2 on the surface of the upper column 53 (stripe steel plate steel pipe 1) serve as a slip stopper for the fixing bolt 55, and the upper column 53 may be firmly engaged with the lower column 52 via the fixing bolt 55 and slip down. There is no.

FIG. 9 shows an example of use as a simple telescopic pole 60. The telescopic pole 60 has the same basic structure as that of the column 51 of FIG. 8, and includes a large diameter pipe 62 and a small diameter pipe 63 fitted into the large diameter pipe 62. A striped steel pipe 1 is used. A fixing bolt 65 screwed into a screw hole 62a formed in the large-diameter pipe 62 is screwed and tightened to fix the small-diameter pipe 63 that is the striped steel pipe 1 in a predetermined expansion / contraction position.
The fixing mechanism using the fixing bolt 65 is substantially the same as the fixing mechanism shown in FIG. 7 (or the fixing mechanism shown in FIG. 8). The protrusion 2 on the surface of the small diameter pipe 63 (stripe steel plate steel pipe 1) serves as an anti-slip against the fixing bolt 65, and the small diameter pipe 63 is firmly engaged with the lower support column 52 via the fixing bolt 55 to extend and contract. Is kept constant.
The telescopic pole 60 can be used for various purposes.

As shown in FIG. 10, it can be used for the leg part 71 in the chair 70 with a height adjustment function. The leg portion 71 includes a large-diameter tubular lower shaft 72 and a small-diameter tubular upper shaft 73 that is fitted into the lower shaft 72 and has an upper end integrally fixed to the lower surface of the seat portion 74. The fixing bolt 75 screwed into the screw hole 72a is screwed and tightened, and the upper shaft 73 is fixed at a predetermined height position. Use.
The operation is substantially the same as that of the embodiment shown in FIGS.

As shown in FIG. 11, the above-described striped steel pipe 1 can be used as the support column 81 of the clothes rack 80 with a concrete table.
In this case, since the protruding portion 2 on the surface of the striped steel pipe 1 (the column 81) functions to be integrated with the concrete 82, it is not necessary to provide a separate retaining portion.

As shown in FIG. 12, the striped steel pipe 1 can be used as the column 91 of the road sign 90. In the same figure, the fastening band 93 attached to the sign plate 92 of the road sign 90 is put on the outer periphery of the support column 91, and bolts 95 are passed through the bolt insertion holes formed at both ends of the fastening band 93 and tightened with nuts. The plate 92 can be fixed to the column 91.
In this case, the protrusions 2 on the surface of the striped steel pipe 1 (post 91) act to increase the friction with respect to the fastening band 93, and the fastening band 93 is firmly bonded to the post 91 and the sign plate 92 may slide down. There is no. However, it is preferable to use a tightening band 93 that is narrow enough to enter between the protrusions 2 adjacent in the vertical direction.

As shown in FIG. 13, the said striped steel pipe 1 can be used for the tree support 100 for preventing the fall of a tree. The tree support 100 in the illustrated example has a configuration in which a crossbar 102 is stretched between two support piles 101 and tied with a string, and the tree 103 is tied to the crosspiece 102 with a string. As the support pile 101 and the crosspiece 102, the above-described striped steel pipe 1 can be used.
In this case, since the protrusions 2 are present on the surface of the striped steel pipe 1 (support pile 101 and crosspiece 102), the mutual contact friction is large, and the crosspiece 102 tied to the support pile 101 with a string is less likely to come off.
In addition, as a mode of support of a tree, for example, there are various modes such as standing up four support piles surrounding a tree, or standing up three support piles diagonally so as to intersect at the top, Applicable to various cases.

The arrangement pattern of the projections on the tube surface is not limited to the arrangement pattern of each of the embodiments described above, and various variations are possible. The arrangement pattern of the projections 2 of the striped steel pipe 1 ′ shown in FIG. 14 (a) is a pattern in which the length direction of the projections 2 of the short ridges forms the longitudinal direction and the circumferential direction of the tube. This striped steel pipe 1 'uses a striped steel plate 3B having protrusions 2 having an array pattern shown in FIG.
The arrangement pattern of the protrusions 2 of the striped steel pipe 1 ″ shown in FIG. 14 (b) is a pattern in which the length direction of the protrusions 2 of the short ridges is only the circumferential direction. 1 ″ uses a striped steel plate 3C having the protrusions 2 of the arrangement pattern shown in FIG.
As shown in FIG. 14 (b), an array pattern striped steel pipe 1 "having only protrusions 2 extending in the circumferential direction is used when a fixing means such as those shown in FIGS. It is preferable because the fixing bolt can be easily set at a predetermined position and the anti-slip function functions effectively.

The striped steel pipe of the present invention has a smaller diameter than a large diameter steel pipe pile. The outer diameter of the steel pipe pile is 318.5 to 2000 mmφ (thickness t = 6.9 to 25 mm) in Table 4 of JIS A 5525, and even if it is actually used, it is usually 114.3 mmφ or more, and at least 89.1 mmφ. It is. On the other hand, the present invention has a smaller diameter of 85 mmφ or less, but is particularly suitable when applied to 60 mmφ or less.
For example, when used as a frame material for a temporary scaffold, the outer diameter is generally 42.7 mmφ, 48, 6 mmφ, etc., and 50 mmφ or less is preferable.
Even when used for a place to be gripped by a hand such as a handrail, a thickness of about 50 mm or less is usually used, and 21.7 to 48.6 mmφ is particularly preferable.
Further, if it is used for a column of an assembly shelf, for example, it is preferably 34.0 mmφ or smaller.
The thickness of the striped steel sheet currently on the market is 2.3 mm, which is the thinnest thickness. On the other hand, since the striped steel pipe of the present invention is mainly used for light load applications, the plate thickness t is preferably 2.3 mm or less (however, depending on the outer diameter), but at a place where some load is applied. If used, a plate thickness of 3.2 mm is also conceivable. If it is used for the frame material of a temporary scaffold, about 2.0 to 2.5 mm, particularly 2.3 mm is preferable. Further, when the outer diameter is about 42.7 mmφ or less with a handrail or an assembly shelf, the plate thickness t is preferably about 1.2 to 2.0 mm. In particular, a thickness of about 0.8 to 1.2 mm is conceivable in the case where a small load is used. In addition, when using it for the place where more load is applied, plate thickness 6.0mm at the maximum is also considered.

  Each of the above-described embodiments is an embodiment in which a round steel pipe is used, but the cross-sectional shape can also be a square (quadrangle) like the small-diameter striped steel square steel pipe 5 shown in FIG. The manufacturing method of the square steel pipe 5 made of a small-diameter striped steel plate can be performed in the same manner as the manufacturing method of a normal square steel pipe.

The cross-sectional shape of the striped steel pipe is not limited to the round tube and the square tube described above, and may be various other cylindrical cross-sectional shapes as shown in FIGS.
Furthermore, it is not limited to a completely closed cylindrical section, and may be an open cylindrical section. Furthermore, when the open part is widened, a so-called lightweight steel is obtained, but such a cross-sectional shape may be used. For example, a C-shaped cross section as shown in FIG.

  In each of the above-described embodiments, the material is a steel plate (striped steel plate), but is not limited to a steel plate, and a striped non-ferrous metal in which a large number of protrusions are formed by rolling on the surface of an aluminum or aluminum alloy plate or other non-ferrous metal plate. It can be applied to a metal tube made of a plate.

BRIEF DESCRIPTION OF THE DRAWINGS The small diameter striped steel plate steel pipe of one Example of this invention is shown, (A) is a partial front view, (B) is an AA cut end view of (A). The example of use of the small diameter striped steel pipe made of FIG. 1 is a front view of a part of a temporary frame scaffold. It is a left view of the frame scaffold of FIG. It is a front view of a ladder, showing an example of use used for a horizontal rail of a ladder used in the above-mentioned frame scaffold. It is the figure of the handrail provided along the stairs installed in a station building etc. which shows the other usage example of the small diameter striped steel plate steel pipe of FIG. FIG. 9 is a perspective view of an assembly shelf, showing still another example of use of the small-diameter striped steel pipe of FIG. 1. It is principal part sectional drawing which shows the structure of the engaging part of the shelf board and support | pillar in the assembly shelf of FIG. FIG. 3 shows still another example of use of the small-diameter striped steel pipe of FIG. 1, (A) is a front view of a coat hanger, and (B) is a side view of the same. FIG. 9 is a front view of the telescopic pole, showing still another usage example of the small-diameter striped steel pipe of FIG. 1. FIG. 2 is a side view of a chair, showing a usage example in which the small-diameter striped steel pipe of FIG. 1 is used as a shaft of a leg portion of a chair with a height adjusting function. FIG. 2 is a side view showing a usage example in which the steel pipe made of small-diameter striped steel of FIG. 1 is applied to a support column of a drying table with a concrete table, and is a side view of the drying table with a concrete table. FIG. 1 shows a use example in which the small diameter striped steel pipe shown in FIG. 1 is applied to a road sign post, (A) is a front view of the road sign, (B) is a side view, and (C) is B- of (B). It is B sectional drawing. It is a figure which shows the usage example which used the small diameter striped steel plate steel pipe of FIG. 1 for the tree support. The arrangement | sequence pattern of the projection part of a pipe | tube surface shows the example of the striped steel plate steel pipe from which FIG. 1 differs, (a), (b) is a front view of a part of striped steel plate steel pipe, respectively. The Example which made the cross-sectional shape the square is shown, (A) The front view of a part of square steel pipe made from a striped steel plate, (B) is a CC cut end view of (A). Still another example of the cross-sectional shape is shown, and (a) to (f) are cross-sectional views of different examples. It is sectional drawing which shows the Example at the time of making cross-sectional shape into an open cross section. It is a top view of a part of the striped steel plate used for manufacture of the striped steel pipe made of FIG. It is a top view of a part of striped steel plate used for manufacture of the striped steel pipe made of FIG. It is a top view of a part of striped steel plate used for manufacture of the striped steel pipe made of FIG.

Explanation of symbols

1, 1 ', 1 "Small-diameter striped steel pipe 2 Protruding parts 3A, 3B, 3C Striped steel 5 Small-diameter strip steel square-shaped steel pipe 10 Frame scaffold 11 Building frame 11a Strut portion 13 Crossing bar 14 Scaffold plate 15 Stair (lifting pier)
16, 17 Handrail 18 Protective frame 20 Ladder 20a Crossbar 20b Pillar material 30 Staircase 31 Assembly rail 41 Horizontal material 42 Engaging member 42a Screw hole 43 Shelf plate 44 Pipe post 45 Fixing bolt 50 Coat hanger 51 Post 52 Lower post 52a Screw hole 53 Upper column 55 Fixing bolt 60 Telescopic pole 62 Large diameter tube 62a Screw hole 63 Small diameter tube 65 Fixing bolt 70 (with height adjustment function) Chair 71 Leg 72 Large diameter tubular lower shaft 72a Screw hole 73 Small diameter Tubular upper shaft 75 Fixing bolt 80 Drying table with concrete base 81 Post 82 Concrete 90 Road sign 91 Post 92 Marking plate 93 Tightening band 95 Bolt 100 Tree support 101 Support pile 102 Crosspiece

Claims (10)

  The outer diameter is 85mm or less, and it is manufactured by ERW pipe manufacturing equipment using striped steel sheet with many protrusions formed on the surface by rolling through rolls with grooves such as discontinuous lattice pattern. A small-diameter striped steel pipe.   The small-diameter striped steel pipe according to claim 1, wherein the steel pipe is used as a frame material in a frame structure constructed with a pipe as a frame material.   2. The small-diameter striped steel pipe according to claim 1, wherein the steel pipe is used as a frame material in a temporary scaffold constructed using a pipe as a frame material.   The small-diameter striped steel pipe according to claim 3, wherein the steel pipe is used as a support in the scaffold.   The small-diameter striped steel pipe according to claim 3, wherein the steel pipe is used as a handrail in the scaffold.   2. The small-diameter striped steel pipe according to claim 1, wherein the steel pipe is used as a handrail provided along a staircase installed in a construction.   The small-diameter striped steel pipe according to claim 1, wherein the steel pipe is used as a horizontal rail for a ladder.   2. The small-diameter striped steel pipe according to claim 1, wherein the steel pipe is used as a pipe support in an assembly shelf in which a pipe support and a horizontal member are connected by a connecting member and a shelf board is attached and assembled.   2. The small-diameter striped steel pipe according to claim 1, wherein the steel pipe is used as a post for attaching a sign plate installed on the ground or road surface. The cross-sectional shape is round or square, and the small-diameter striped steel pipe according to claim 1.

Images