Polygonal support columns and support system using the same
The polygonal support column system addresses the issues of buckling and low rigidity in conventional columns by using a polygonal cross-section with joint bases and closed sections, enhancing strength and ease of handling.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- OYAMA KASETSU CO LTD
- Filing Date
- 2025-12-23
- Publication Date
- 2026-07-07
Smart Images
Figure 2026113440000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a multi-corner support column that can be used for various applications such as support columns, pedestals, scaffolds, temporary support columns, etc. of formwork, and a support column system using the same.
Background Art
[0002] Conventional square support columns arrange four steel pipes of the same length along the four corners of a virtual square column in parallel with each other, and provide joint plates at both ends of the four steel pipes respectively. For example, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2024-58715) discloses a connection structure of a square support column including a plurality of connection members connected to the upper or lower part of the square support column, and a horizontal connecting beam and a horizontal brace that are joined to the joint part of the connection members to connect two horizontally separated connection members. The conventional square support column vertically arranges a total of four support columns at intervals in the front, rear, left, and right directions, and integrally connects them through bases at both the upper and lower ends and spacers arranged at a plurality of locations between the upper and lower ends. Since there is a gap between the four steel pipes, the conventional square support column is lightweight and advantageous for loading and transporting on a vehicle. The conventional support column system in which a plurality of the square support columns are integrally combined is superior in strength to, for example, a scaffold combined with conventional single-pipe pipes.
[0003] Furthermore, Patent Document 2 (Japanese Patent Publication No. 2022-110770) describes an L-shaped connector, a U-shaped connector, and a temporary structure construction set for constructing temporary structures, as well as a method for constructing temporary structures. This document describes a structure that is a hollow polygonal prism (for example, a rectangular parallelepiped), with the center of each side wall and top and bottom wall passing through as a lightweight hole, a work hole, etc., and multiple through holes for inserting bolts drilled at equal intervals along each side of each side wall and top and bottom wall. The document describes a technique in which the seating surface of the L-shaped connector is joined with bolts and nuts using any of the through holes of the structure, the L-shaped connector extends from the structure, and the structural steel is placed on top of it on a horizontal wall that serves as a temporary fixing point for the structural steel, and the overlapping portion of the horizontal wall and the structural steel is temporarily fixed by clamping it from above and below. The hollow polygonal prism structure can obtain higher rigidity than the square support made by integrating four steel pipes. [Prior art documents] [Patent Documents]
[0004] [Patent Document 1] Japanese Patent Publication No. 2024-58715 [Patent Document 2] Japanese Patent Publication No. 2022-110770 [Overview of the Initiative] [Problems that the invention aims to solve]
[0005] However, since the square support column described in Patent Document 1 has gaps between the four columns, when a load is applied between the upper and lower ends, it is not possible to maintain the distance between the columns, and the possibility of buckling deformation or torsional deformation cannot be ruled out. Furthermore, the structure described in Patent Document 2 is hollow, with large openings in the center of each side wall and top and bottom wall, and multiple through holes for bolts are arranged along the corners of each side wall and top and bottom wall. Because the opening area is large, it is thought that the rigidity against external forces such as compression and twisting is low.
[0006] In view of these circumstances, the present invention aims to provide a higher-performance polygonal support column and a support column system using the same, by reducing weight, increasing compressive strength and torsional strength between the upper and lower ends. Furthermore, conventionally available square support posts are long, making them difficult to transport and install. On the other hand, short square support posts are easy to transport and install, but require greater strength at the connecting parts. Therefore, one of the objectives of this invention is to provide a polygonal support post and a support post system using the same that are easy to transport and install while ensuring sufficient strength at the connecting parts. [Means for solving the problem]
[0007] The present invention provides a polygonal support column comprising a column with a polygonal cross-section and a joint base, one of which is integrally provided at each end of the column in the longitudinal direction, wherein the joint base has connecting holes drilled at least three times at the intersections of a virtual straight line extending centrifugally from the centroid of the polygonal cross-section of the column through each vertex and a virtual circle with the centroid as its center and a radius larger than that of the polygonal cross-section. According to the polygonal support column, the polygonal cross-section of the pipe column has multiple side walls that form a polygonal cross-section and are continuous between the joint bases, thereby increasing the compressive strength and torsional strength between the ends in the longitudinal direction. Furthermore, the connection of these polygonal support columns is achieved by connecting the joint bases of the polygonal support columns to be connected.
[0008] Furthermore, the connecting holes formed in the joint base in the present invention are formed at the intersections of a virtual straight line extending centrifugally from the centroid of the polygonal cross-section of the pipe column through each vertex and a virtual circle with a radius larger than the polygonal cross-section centered on the centroid. This allows the distance between connecting holes to be maximized. As a result, the connection strength and rigidity of the joint bases can be increased, and even when multiple connecting parts are provided between joint bases, the compressive strength and torsional strength in the longitudinal direction of the connected polygonal columns can be increased.
[0009] As a result, even when multiple polygonal support columns are connected in the longitudinal direction, the connection strength and rigidity at the connection point can be increased, allowing the length of a single polygonal support column to be 1.5 m or less, and especially 1.2 m or less. This makes it possible to create a polygonal support column and a support system using it that are easy to carry, handle, and install while ensuring sufficient rigidity. The connecting holes can be arranged at the intersections that are at equal angular intervals around the center of the circumscribed circle of the polygonal cross-section of the pipe column.
[0010] In the present invention described above, it is desirable to provide holes with a polygonal or circular cross-sectional shape at each corner of the inside of the polygonal cross-section of the pipe column in the joint base. By providing such holes, rainwater that flows into the pipe column can be quickly drained to prevent rust and the occurrence of pests, and the plating solution used during manufacturing can be quickly discharged. Furthermore, it is desirable that the joint base be formed with a thickness greater than that of the pipe column, and in particular, 1.8 times the thickness of the pipe column, and even more than twice the thickness of the pipe column. By forming the joint base thicker, the axial load-bearing capacity can be increased and the amount of deformation can be reduced.
[0011] The present invention allows for a polygonal support column in which closed sections with either a polygonal or circular cross-sectional shape are provided at each corner of the polygonal cross-section of the column. The closed section can be formed by joining I-shaped partition walls, M-shaped partition walls, or circular pipes along each corner of the inside of the column. The closed section can be formed as a single unit over the entire length between the two ends of the column in the longitudinal direction. The closed section can be formed as a single unit comprising multiple fixed-length sections spaced equally apart between the two ends of the column in the longitudinal direction.
[0012] The present invention allows for the drilling of lightweight holes in the side wall of the pipe column at a position that does not interfere with the closed cross-section. The aforementioned weight-reducing holes allow for weight reduction without compromising the reinforcing effect of the closed cross-section. The weight-reducing holes are circular and can be provided in groups of 1 to 3 on each side wall at intervals. The weight-reducing holes can be modified in shape, size, and number to serve as mounting holes for connecting components.
[0013] The present invention allows for a polygonal support column in which stacking grooves exceeding the width of one side of the polygonal cross-section of the pipe column are recessed in the four sides of each joint base corresponding to the outer sides of each side of the polygonal cross-section of the pipe column. The stacking groove allows for the retention of upper columns and prevents them from falling off during transport when multiple horizontally laid polygonal columns are stacked and loaded onto a vehicle. The width of the stacking groove can be set to be slightly greater than the width of one side of the polygonal cross-section of the column to further suppress displacement.
[0014] The present invention provides a support system utilizing polygonal support columns, comprising two or more polygonal support columns arranged parallel to each other at intervals, connecting frames having clamps that are detachably attached to the tubular columns of each polygonal support column, and single pipes that span and connect between the clamps of the connecting frames. The connecting frame eliminates the need for a connecting structure to the polygonal support column, simplifies the shape of the polygonal support column, reduces its weight to a level that allows it to be carried by hand, and facilitates handling during installation. The connecting frame has a winding portion that wraps around the polygonal cross-section of the pipe column and a tightening mechanism that tightens the winding portion, and the clamp can be pivotally attached to the winding portion in a position that can be adjusted. [Effects of the Invention]
[0015] According to the polygonal column of the present invention and the column system using the same, the ease of handling can be improved compared to the conventional type, and the compressive rigidity and torsional rigidity between the top and bottom can be increased. It is possible to achieve an excellent effect of improving the transportation efficiency of the polygonal column compared to the conventional type. Furthermore, even when a plurality of polygonal columns are connected in the length direction, since the connection strength and rigidity at the connection part can be increased, it is possible to form a polygonal column with increased rigidity in the length direction and a column system using the same by connecting a plurality of polygonal columns. In particular, when a plurality of polygonal columns are connected, since the elongation becomes remarkable and the possibility of buckling increases, by connecting adjacent polygonal columns that are spaced apart from each other and parallel to each other with a connecting member, the strength of the column system in which a plurality of polygonal columns are connected in the length direction can be ensured. In particular, it is desirable to perform the connection between the polygonal columns connected in the length direction by the connecting members at intervals of 6 m or less, particularly 4 m, in the length direction.
Brief Description of the Drawings
[0016] [Figure 1] It is a (A) perspective view, (B) three-view drawing, (C) cross-sectional view showing an example of the B-B cross-section, and (D) cross-sectional view showing another example of the B-B cross-section of the polygonal column according to the first embodiment. [Figure 2] It is a (A) perspective view, (B) end view in the length direction, and (C) A-A cross-sectional view according to the second embodiment. [Figure 3] It is a three-view drawing showing the stacked state of two polygonal columns 2. [Figure 4] (A) is a perspective view of the polygonal column 2 incorporating the beam receiving piece 80, and (B) is a perspective view of the polygonal column 2 incorporating the lifting piece 81. [Figure 5] (A) is a perspective view of the rotating piece 82, (A-1) is a front view of the rotating piece 82, (B) is a perspective view of the connecting piece 83, and (B-1) is a front view of the connecting piece 83. [Figure 6] (A) is a perspective view of the low-floor jack piece 84, (A-1) is a front view of the low-floor jack piece 84, and (B) is a front view of the standard jack piece 85. [Figure 7](A) is a perspective view showing the support column system 1, (A-1) is a plan view showing the connecting frame 10, and (B) is a front view showing the support column system 1 using the rotating piece 82 and the connecting piece 83. [Figure 8] (A) Graph of the compression test of the polygonal support columns 1A and 2A, (A-1) Front view and L1-L1 cross-sectional view of the polygonal support column 1A, and (M-2) Front view and L2-L2 cross-sectional view of the polygonal support column 2M. [Figure 9] Graph of the compression test of the polygonal support columns 1B and 2B.
Mode for Carrying Out the Invention
[0017] Hereinafter, referring to the drawings, the polygonal support column according to the present embodiment and the support column system using the same will be specifically described. In particular, as shown in FIG. 1, the polygonal support column 2 of the first embodiment is composed of a pipe column 3 and a mouth base 4 integrated one by one at both ends 30 in the length direction of the pipe column 3. The cross-section cut in the direction orthogonal to the length direction of the pipe column 3 can be a square as a polygon (preferably a regular polygon). The polygon is a polygon in which all side lengths are equal and all interior angles are equal, and can be, for example, an equilateral triangle, a square, a regular pentagon, a regular hexagon, a regular heptagon, a regular octagon, etc.
[0018] The mouth base 4 can have connecting holes 40 drilled at at least three locations arranged at equal angular intervals around the center of gravity, which are the intersections of virtual straight lines extending in the centrifugal direction through each vertex from the center of gravity of the polygonal cross-section of the pipe column 3 and a virtual circle centered on the center of gravity and having a radius larger than the square cross-section. The mouth base 4 can have connecting holes 40 drilled at four locations, which are the intersections of virtual straight lines extending in the centrifugal direction through each vertex from the center of gravity of the square cross-section of the pipe column 3 and a virtual circle centered on the center of gravity and having a radius larger than the square cross-section. The connecting holes 40 can also be additionally drilled at other positions.
[0019] The polygonal support column 2 can be set to a total length L of 100 to 1500 mm for easy transport, and can be set in increments of 50 mm. For example, polygonal support columns 2 with different lengths of 100 mm, 150 mm, 200 mm, 400 mm, 600 mm, 800 mm, 1000 mm, 1200 mm, and 1400 mm can be prepared. The pipe column 3 can be made of steel pipe with a side width W of 100 mm or 125 mm and a wall thickness 32 of 3.2 mm or 4.5 mm. However, the polygonal support column 2 can be made to other widths and wall thicknesses depending on requirements such as load capacity during use, but it is desirable that it be light enough to be carried by one person.
[0020] The joint base 4 can be made of a steel plate with a thickness of 8 mm or 9 mm, with a side width 41 circumscribed within a 200 mm square. The connecting holes 40 can be drilled at four points at the intersections of a virtual straight line extending centrifugally from the diagonal of the square cross-section of the pipe column 3 and a virtual circle (for example, a virtual circle with a radius of 106.07 mm or 114.90 mm) that is larger than the circumscribed circle of the square cross-section of the pipe column 3 (radius 70.71 mm or 88.39 mm) and smaller than the circumscribed circle of the 200 mm square (radius 141.42 mm).
[0021] The joint base 4 has a chamfered shape on the apex corners that are centrifugal to each connecting hole 40. Between the connecting holes 40 on the four sides of each joint base 4 that correspond to the outer sides of each side of the square cross-section of the pipe column 3, a stacking groove 7 can be recessed with a width exceeding the width W of one side of the square cross-section of the pipe column 3, for example, 110 to 150 mm or 135 to 175 mm, and a depth of 5 to 30 mm. As shown in Figure 6, by utilizing the stacking groove 7, multiple polygonal support columns 2 in an overturned (horizontal) position can be stably stacked without the load collapsing.
[0022] As shown in Figure 1, the polygonal support column 2 can have closed section portions 5 with a polygonal (preferably regular polygonal) or circular (preferably perfect circle) cross-section at the four inner corners of the square cross-section of the pipe column 3. Such closed section portions 4 can be formed by welding reinforcing plates 50 to the four inner corners of the square cross-section of the pipe column 3. Lightweight holes 6 can also be drilled in the side wall 32 of the pipe column 3 at positions that do not interfere with the closed section portions 5. However, since providing such lightweight holes 6 can cause buckling or deformation near the lightweight holes 6, it is desirable not to provide such lightweight holes 6 in order to increase strength. Drainage holes 35 can be opened at the corners of the polygonal cross-sections at both ends 30 in the longitudinal direction of the pipe column 3. Drainage holes 35 that open flush with the joint base 4 can be opened at each of the four corners of the square cross-sections at both ends 30 in the longitudinal direction of the pipe column 3. The drainage holes 35 allow rainwater and other liquids that flow into the pipe column 3 to be drained quickly, preventing rust and the occurrence of pests.
[0023] Figure 2 shows a polygonal support column 2 according to another embodiment, (A) a perspective view, (B) a longitudinal end view, and (C) a cross-sectional view AA. In this second embodiment as well, the polygonal support column 2 consists of a pipe column 3 and joint bases 4 that are integrated at both ends 30 in the longitudinal direction of the pipe column 3. The total length L and wall thickness of the pipe column 3 in this embodiment are the same as those of the polygonal support column 2 shown in Figure 1. However, the polygonal support column 2 according to this embodiment does not have closed section portions 5 at the four inner corners of the square cross-section of the pipe column 3. That is, since reinforcing plates 50 are not welded to the four inner corners of the pipe column 3, the manufacturing process can be simplified. Furthermore, the joint base is provided with polygonal or circular cross-sectional holes 36 in the area located inside the polygonal cross-section of the pipe column, particularly at each corner of the polygonal cross-section of the pipe column. These holes 36 quickly drain rainwater and other liquids that flow into the pipe column 3, preventing rust and the occurrence of pests, and can also function as drainage holes for the plating process during manufacturing.
[0024] According to the polygonal support column 2 of this embodiment, higher compressive strength and improved ease of handling can be achieved compared to conventional square support columns. In particular, since the spacing between the connecting holes of the joint bases that connect the polygonal support columns is made larger, and the thickness of the joint bases is also greater than the thickness of the polygonal support columns, sufficient load-bearing capacity can be ensured even when multiple square support columns are connected.
[0025] The support system 1 according to this embodiment can be combined with various auxiliary pieces 8 in addition to the polygonal support 2. For example, the beam support piece 80 shown in Figure 4(A) can be combined. The beam support piece 80 has a U-shaped retaining frame 800 capable of horizontally supporting an H-shaped steel beam (not shown), and a support rod 801 hanging down from the lower part of the center of gravity of the retaining frame 800. The lower wall of the retaining frame 800 is a plane that connects to the joint base 4 of the polygonal support 2. The support rod 801 can be attached to a lightweight hole 43 drilled in the thickness direction at the center of gravity of the joint base 4 of the polygonal support 2.
[0026] The beam support piece 80 is installed on the upper end of multiple polygonal support columns 2 erected at a distance from each other on a horizontal, straight line, and an H-shaped steel beam can be horizontally mounted between the beam support piece 80. A retaining pipe (not shown) can be provided inside the tubular column 3 of the polygonal support column 2 to hold the tip end of the support rod 801. The support rod 801 and the lightweight hole 43 and / or retaining pipe can, for example, have a polygonal (preferably regular polygonal) cross-section perpendicular to the axis of the support rod 801, and the angular orientation of the retaining frame 800 around the axis can be temporarily fixed at unit angles (360° / number of vertex angles) determined for each polygon. The retaining frame 800 has an L-shaped cross-section, and an H-shaped steel beam can be temporarily fixed using a clamp (not shown).
[0027] The lifting piece 81 shown in Figure 4(B) has a lifting ring 811 on the center of gravity of a connecting plate 810 which has the same shape as the joint base 4. The connecting plate 810 is placed on top of the joint base 4, and the connecting holes 40 of the joint base 4 and the connecting holes 812 of the connecting plate 810 are integrated by bolts and nuts (not shown), enabling lifting by a crane.
[0028] The rotating piece 82 shown in Figures 5(A) and (A-1) consists of a pair of connecting plates 820 facing each other, which have the same shape as the joint base 4, with a rotating mechanism 821 interposed between the pair of connecting plates 820. The rotating mechanism 821 has a support leg 8210 integrated into the opposing wall corresponding to the center of gravity of one connecting plate 820, a rotating leg 8211 integrated into the opposing wall corresponding to the center of gravity of the other connecting plate 820, and a support shaft 8212 that pivotally attaches the rotating leg 8211 to the support leg 8210 so that it can rotate freely. The connecting plates 820 have connecting holes 8200 that connect to each of the connecting holes 40 of the joint base 4 with bolts and nuts (not shown). The rotating piece 82 can connect to each of the connecting plates 820, the joint base 4 of the polygonal support column 2, and other auxiliary pieces 8. The rotating mechanism 821 may be provided with a temporary posture fixing mechanism for temporarily fixing the angular position of the other support leg 8211 relative to the other support leg 8210.
[0029] The connecting piece 83 shown in Figures 5(B) and (B-1) has a pair of connecting plates 830 that are substantially the same shape as the joint base 4, and the connecting plates 830 have a clamping frame 831 integrated into their front walls, which is attached to a part of the square cross-section of the column 3 of the polygonal support 2. The clamping frame 831 has flanges 8310 with connecting holes 8311 at both ends. The connecting piece 83 is separate from the clamping frame 831 and has a joint 832 that is attached to another part of the square cross-section of the column 3. The joint 832 has flanges 8320 that face the flanges 8310 and have connecting holes 8321 at both ends.
[0030] The connecting piece 83 can be connected to any auxiliary bead 8 or the joint base 4 of the polygonal support column 2 using bolts and nuts to connect the connecting plate 830. The clamping frame 831 and joint 832 surround the square cross section of the middle part of the column 3 of the polygonal support column 2, and the connecting holes 8311 and 8321 of the flanges 8310 and 8320 can be tightened with bolts and nuts (not shown) to connect the connecting piece 83 to the middle part of the column 3. A spacer 8300 can be provided between the connecting plate 830 and the clamping frame 831, and between the joint base 4 and the flange 8310 to secure a working space and increase the joint strength between them.
[0031] The low-profile jack piece 84 shown in Figures 6(A) and (A-1) has a joint base 840 having the same shape as the joint base 4, and a screw shaft 8400 is erected on the center of gravity of the joint base 840 via a reinforcing support part 8401 consisting of a short cylinder and reinforcing ribs. The screw shaft 8400 has a smaller diameter than the weight-reducing hole 43 drilled at the center of gravity of the joint base 4 of the polygonal support column 2. The length of the screw shaft 8400 can be 100 to 500 mm, preferably 130 to 230 mm, and can be set to, for example, 234 mm. A lifting handle 841 having a lifting nut and an operating handle extending centrifugally from the lifting nut is screwed onto the screw shaft 8400, and a lifting base 842 is mounted on the lifting handle 841.
[0032] The lifting base 842 has a passage opening 8420 through which a screw shaft 8400 passes in the thickness direction at the center of gravity. The lifting base 842 has a reinforcing support part 8421 consisting of a short cylinder and reinforcing ribs below the passage opening 8420, and the lower end of the reinforcing support part 8421 is slidably mounted on the lifting nut of the lifting handle 841. The joint base 4 of the polygonal support column 2 can be connected to the joint base 840 and the lifting base 842, respectively. The height of the lifting base 842 can be adjusted by rotating the lifting handle 841. A fall prevention cap 8402 with an outer diameter larger than the passage opening 8420 of the lifting base 842 can be provided at the tip of the screw shaft 8400. A temporary fixing mechanism that restricts rotational descent can be provided on the lifting handle 841.
[0033] The standard jack piece 85 shown in Figure 6(B) has a joint base 850, a lifting handle 851, and a lifting base 852. Above the center of gravity of the joint base 850 is a reinforcing support section 8501 consisting of a short cylinder and reinforcing ribs, and a screw shaft 8500 having a length of, for example, 500 to 1000 mm, preferably 210 to 450 mm, can be erected in the short cylinder of the reinforcing support section 8501. A washer unit 8502 can be built into the short cylinder to reinforce and cushion between the joint base 850 and the base end of the screw shaft 8500. However, this washer unit 8502 can also be formed as an integral part of the screw shaft 8500.
[0034] As shown in Figure 7(A), the support system 1 according to this embodiment includes two or more polygonal support columns 2 erected vertically at intervals, a connecting frame 10 having, for example, a single-pipe clamp 100 which is detachably attached to the pipe columns 3 of each polygonal support column 2, and a single pipe 11 which spans and connects between the single-pipe clamps 100 of the connecting frame 10.
[0035] As shown in Figure 7(A-1), the connecting frame 10 has a winding portion 101 that wraps around the square cross-section of the pipe column 3 and a tightening mechanism 102. The winding portion 101 has an L-shaped frame 1010 that is attached to two adjacent sides of the square cross-section of the pipe column 3, a closing lever 1011 that can be opened and closed provided at one end of the L-shaped frame 1010, and a tightening bolt 1012 that can be opened and closed provided at the other end of the L-shaped frame 1010.
[0036] The closing lever 1011 and the tightening bolt 1012 can be wrapped around the two remaining sides of the square cross-section of the pipe column 3 that the L-shaped frame 1010 has wrapped around. Between the closing lever 1011 and the tightening bolt 1012, a tightening mechanism 102 can be provided, consisting of a split seat portion 1020 at the tip of the closing lever 1011 and a bolt portion and nut 1021 at the tip of the tightening bolt 1012. One side of the L-shaped frame 1010 has a single pipe clamp 100 for a single pipe 11. The single pipe clamp 100 may be a swivel clamp or a right-angle clamp, and can be rotatably pivoted to the L-shaped frame 1010 or fixed in place.
[0037] As shown in Figures 7(A) and (A-1), the connecting frame 10 is attached to the middle of the column 3 of the polygonal support column 2 by wrapping the L-shaped frame 1010 and closing lever 1011 around it, and the tip of the tightening bolt 1012 is positioned between the split seat portion 1020 of the closing lever 1011, and the nut 1021 of the tightening mechanism 102 can be tightened to temporarily fix it. A single pipe 11 is placed between the single pipe clamps 100 of the connecting frame 10 attached to each of the two polygonal support columns 2, and the bolts and nuts of each single pipe clamp 100 are tightened to temporarily fix them, thereby connecting the two polygonal support columns 2 in a frame-like manner.
[0038] The single pipe clamp 100 can be used to attach the single pipe 11 to form a cantilever beam. The side wall 32 of the pipe column 3 may also be provided with holes for weight reduction (not shown). If the holes are circular, they can also serve as mounting holes for connecting parts such as the clamp 100 for the single pipe. The mounting holes may have auxiliary holes added to fix the position of the clamp 100.
[0039] The connecting frame 10 can be replaced with one having a pair of joints 103, each having flanges 1030 with connecting holes 1031 extending from both ends of a U-shape that surrounds half of the square cross-section of the pipe column 3, and a single-pipe clamp 100 provided on at least one of the joints 103. The connecting frame 10 surrounds the square cross-section of the pipe column 3 with the pair of joints 103, and can be temporarily fixed by attaching bolts and nuts 1032 between the connecting holes 1031 of the opposing flanges 1030.
[0040] As shown in Figure 7(B), in this embodiment, the support system 1 has H-shaped steel beams 87 horizontally placed between the upper ends of polygonal support columns 2 erected in a vertical position, and the H-shaped steel beams 87 are fixed by auxiliary beads 8 provided at the upper ends of the polygonal support columns 2. Alternatively, the joint base 4 and the edges of the H-shaped steel beams 87 can be temporarily fixed with C-clamps (not shown) to assemble them into a gate-like structure.
[0041] The support system 1 can be fitted with an anti-tipping unit 9 on the vertical column 3 of the polygonal support 2. The anti-tipping unit 9 connects one end of the polygonal support 2, which has the rotating pieces 82 attached to both ends, to the column 3 of the polygonal support 2 via the connecting piece 83, and fixes the other end to a base or the ground, thereby preventing the polygonal support 2 from tipping over. The anti-tipping unit 9 can adjust the connection angle of the rotating piece 82 and the connection vertical position of the connecting piece 83 to match the height of the polygonal support 2. The connecting piece 83 can also be used as a bracing unit installed between the column 3 of two polygonal support 2 that are erected vertically at a distance from each other. Such a bracing unit can connect the polygonal support 2, which has the rotating pieces 82 attached to both ends, to the column 3 of the two polygonal support 2 via the connecting piece 83. [Examples]
[0042] The polygonal support column 2 according to this embodiment can achieve higher compressive strength and lighter weight than conventional square support columns. The dimensions and shape of each polygonal support column 2 according to this embodiment and the results of a test in which compression was applied to the polygonal support column 2 under the same conditions in the longitudinal direction (hereinafter referred to as the "compression test") are shown below.
[0043] The graph of the compression test (test speed 6 mm / min) shown in Figure 8(A) shows the test results for test specimen 1A of the polygonal support 2 with a solid line and the test results for test specimen 2A with a dashed line. The maximum point test force and maximum point displacement for each test specimen are shown in Table 1.
[0044] [Table 1]
[0045] As shown in Figure 8(A-1), the pipe column 3 in the test specimen 1A has a total length L of 900 mm, a side width W of 100 mm, and a thickness of 4.5 mm. Reinforcing plates 50 with a width of 32 mm, a length of 882 mm, and a thickness of 3 mm are provided at each of the four inner corners of the pipe column 3, forming a closed section 5 where the cross section in the longitudinal direction is closed into an isosceles triangle. The reinforcing plates 50 are welded with a width of 3 mm and a length of 52 of 30 mm at 100 mm intervals along the longitudinal welding pitch 51 of the polygonal support column 2. The joint base 4 has a side width 41 of 200 mm and a thickness 42 of 9 mm.
[0046] As shown in Figure 8(A-2), the pipe column 3 of the test specimen 2A has the same shape and dimensions as the test specimen 1A. Two 50 mm diameter lightweight holes 6 are drilled in the two opposing side walls 32 of the pipe column 3, at a position half the width W of one side and 225 mm from one end towards the halfway point of the total length L, with a distance 34 between their centers of 450 mm. Two 50 mm diameter lightweight holes 6 are drilled in the two side walls adjacent to and facing each other, at a position 225 mm from the other end opposite to the halfway point of the total length L, with a distance 34 between their centers of 450 mm. The joint base 4 has a side width 41 of 200 mm and a thickness 42 of 9 mm.
[0047] From the results of the compression test in this Example 1, it was confirmed that test specimen 1A, which does not have the weight-reducing holes 6 in the pipe column 3, has higher strength in the compression test than test specimen 2A, which does have the weight-reducing holes 6. Therefore, it was confirmed that a square support column without the weight-reducing holes 6 is desirable when a large load-bearing capacity is required. [Examples]
[0048] The graph in Figure 9, showing the compression test (test speed 6 mm / min), shows the test results for test specimen 1B of the polygonal support 2 with a solid line and the test results for test specimen 2B with a dashed line. The maximum point test force and maximum point displacement for each test specimen are shown in Table 2.
[0049] [Table 2]
[0050] In this embodiment 2, the pipe columns 3 of test specimens 1B and 2B have a total length L of 800 mm, a side width W of 100 mm, and a thickness of 4.5 mm. Reinforcement plates 50 are not provided at the four inner corners of the pipe columns 3. The joint base 4 has a side width 41 of 200 mm, and the thickness 42 is 8 mm for test specimen 1A and 9 mm for test specimen 2B.
[0051] The test results from this Example 2 confirmed that the maximum test force point and the maximum displacement point differed depending on the thickness of the joint base. In other words, it was confirmed that using a thicker joint base slightly increased the load-bearing capacity and reduced the displacement. However, since there was no significant difference in load-bearing capacity and displacement between 8mm and 9mm thicknesses, it is desirable to form it with an 8mm thickness if the goal is to reduce weight. [Industrial applicability]
[0052] The polygonal support column and support column system using the present invention can be used in architecture, construction, civil engineering works, exhibition facilities, temporary structures, shoring, scaffolding, temporary facilities for various events, etc. [Explanation of Symbols]
[0053] 1. Support System 2 polygonal support columns 3 tube pillar 30 Same at both ends 32 Same side wall 34 Center distance 35 Drain hole 4 Joint base 40 Connection hole 41 Same Width of one side 43 Same lightweight holes, 5 Closed section 50 Reinforcement plate 51 Same welding pitch 6. Lightweight holes (mounting holes) 7 Stacking grooves 8 auxiliary beads 80 Same beam support piece 800 Same holding slot 801 Same support rod 81. Lifting piece 810 Same connection plate 811 Same fishing ring 812 Connection hole 82. Same rotating piece 820 Same connection plate 8200 Connection hole 821 Rotation mechanism 8210 Same support leg 8211 Same rotating leg 8212 Same support shaft 83. Same connecting piece 830 Same connection plate 8300 Same Spacer 831 Same clamping frame 8310 Same Tsuba 8311 Connection hole 832 Same joint 8320 Same Tsuba 8321 Connection hole 84. Low-profile jack piece 840 Same joint base 8400 Same screw shaft 8401 Reinforcement support section 8402 Anti-drop cap 841 Lifting handle 842 Same lifting base 8420 Passage gate 8421 Reinforcement support section 85 Standard jack piece 850 Same joint base 8500 Same screw shaft 8501 Reinforcement support section 8502 Same washer unit 851 Lifting handle 852 Same lifting base 87 Same H-beam 9. Anti-tip unit 10 Connecting frame 100 Single pipe clamp 101 Winding section 1010 Same L-shaped frame 1011 Same closing lever 1012 Same tightening bolt 102 The same tightening mechanism 1020 The split end seat of the closing lever 1011 1021 Same Bolt part and nut 103 Same joint 1030 Same Tsuba 1031 Connection hole 1032 Bolts and nuts 11 Single pipe
Claims
1. A column with a polygonal cross-section, It consists of a joint base, one of which is integrally provided at each end of the length direction of the aforementioned pipe column, The joint base is a polygonal support column in which connecting holes are drilled at at least three points at the intersections of a virtual straight line extending centrifugally from the centroid of the polygonal cross-section of the pipe column through each vertex and a virtual circle with a radius larger than the polygonal cross-section, centered on the centroid.
2. In the joint base, holes with a polygonal or circular cross-sectional shape are provided at each corner of the inside of the polygonal cross-section of the pipe column. The polygonal support column according to claim 1, wherein the thickness of the joint base is formed to be thicker than the thickness of the pipe column.
3. The polygonal support column according to claim 1, wherein stacking grooves with a width exceeding the width of one side of the polygonal cross-section of the pipe column are recessed in each joint base on four sides corresponding to the outside of each side of the polygonal cross-section of the pipe column.
4. Two or more polygonal supports arranged parallel to each other at intervals, It consists of connecting members that are detachably attached to the tubular columns of each of the aforementioned polygonal support columns and connect the polygonal support columns to each other. A support system utilizing the polygonal support described in any one of claims 1 to 3 as the aforementioned polygonal support.
5. A rotating piece is provided at the joint base of any of the aforementioned polygonal support columns. The rotating piece comprises a pair of connecting plates having the same shape as the joint base, facing each other, and a rotating mechanism interposed between the pair of connecting plates. The rotating mechanism comprises a support leg integrated with the opposing wall corresponding to the center of gravity of one connecting plate, a rotating leg integrated with the opposing wall corresponding to the center of gravity of the other connecting plate, and a support shaft that pivotally attaches the rotating leg to the support leg so that it can rotate. The support system according to claim 4, wherein the connecting plate has connecting holes that are directly opposite to each connecting hole of the joint base.
6. A connecting piece is provided at the joint base of any of the aforementioned polygonal support columns. The connecting piece is, The aforementioned joint base consists of a pair of connecting plates of substantially the same shape, A clamping frame, which is integrated with the connecting plate and attached to a part of the square cross-section of the column of the polygonal support, The support column system according to claim 4, comprising a joint that is separate from the clamping frame and is attached to another part of the square cross-section of the pipe column.
7. A jack piece is provided at the joint base of one of the aforementioned polygonal support columns. The jack piece has a joint base for the jack piece that has the same shape as the joint base provided on the polygonal support column. On the upper surface of the joint base for the jack piece, a joint base-side reinforcing support part consisting of a short cylinder and reinforcing ribs is erected, and a screw shaft is inserted into the short cylinder of the joint base-side reinforcing support part. A lifting handle having a lifting nut and an operating handle extending centrifugally from the lifting nut is screwed onto the screw shaft. The lifting handle is equipped with a lifting base. The support column system according to claim 4, wherein the lifting base has a passage hole drilled in the thickness direction through which the screw shaft passes, and has a lifting base side reinforcing support portion consisting of a short cylinder and a reinforcing rib on the lower surface of the passage hole, and the lower end of the reinforcing support portion is mounted on the lifting nut of the lifting handle.