Joining structure, steel column, and erection method

Abstract

Steel columns are joined together without the use of erection pieces. [Solution] A joining structure for an upper steel column and a lower steel column, both having openings at both ends in the longitudinal direction and having a hollow rectangular horizontal cross-sectional shape, wherein the lower steel column comprises a joining member welded to the upper end opening, two plate-like members having a cross shape in plan view and fixed to the upper surface of the joining member, and bolt through holes provided on the surfaces corresponding to each side of the cross shape, and the upper steel column comprises a fixing part having bolt fixing holes provided in the side wall (or peripheral wall) at a position opposite to the bolt through holes in the joining part of the lower steel column, and the joining part and the fixing part are fixed with bolts and nuts to join the lower steel column and the upper steel column.

Description

Technical Field

[0006] , ,

[0001] The present invention relates to a joining structure, a steel column, and a method of erecting the same.

Background Art

[0002] A method of joining steel columns using erection pieces is known. For example, in Patent Document 1, erection pieces are detachably attached by bolts to respective erection piece attachment locations through bolt holes formed in the outer peripheral surface of the connection end side of the upper and lower columns, and the upper and lower columns are temporarily connected in a positioned state by connecting these upper and lower erection pieces with a connecting jig. A method of temporarily connecting columns is described.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Joining of steel columns (particularly, square steel pipe columns) is usually welded at the construction site, and erection pieces are used to temporarily fix the steel columns to each other until the joining (welding) of the steel columns is completed. However, operations such as attachment of these erection pieces, tightening with bolts, and removal of the erection pieces are laborious and impose a burden on workers.

[0005] The present invention provides a technique for joining steel columns without using erection pieces.

Means for Solving the Problems

[0007] At least one bolt through-hole may be formed on each face corresponding to each side of the cross shape.

[0008] The bolt through holes may be formed at different positions in the vertical direction between the two plate-like members.

[0009] The bolt through holes may be formed at different positions in the horizontal direction between the two plate-like members.

[0010] Another aspect of the present invention provides a steel column having a steel column body having openings at both ends in the longitudinal direction and a hollow rectangular cross-sectional shape in the horizontal direction, a joint provided at one end in the longitudinal direction, and a fixing part provided at the other end in the longitudinal direction, wherein the joint has a joint member welded to the upper end opening, two plate-like members having a cross shape in plan view and fixed to the upper surface of the joint member, and bolt through holes provided on the surfaces corresponding to each side of the cross shape, and the fixing part has bolt fixing holes provided in the side wall of the steel column body at positions opposite to the bolt through holes in the joint of the lower steel column.

[0011] Another aspect of the present invention provides a method for erecting an upper steel column and a lower steel column having the joint structure described in one aspect of the present invention, comprising the steps of: erecting the lower steel column; installing the upper steel column on the lower steel column; inserting a bolt through the bolt fixing hole on one side of the upper steel column and inserting the bolt through the bolt through hole and the bolt fixing hole on the other side facing the said side; fixing the bolt protruding outward from the said side and the other side with a nut; and welding the upper end opening side of the lower steel column to the lower end opening side of the upper steel column.

[0012] The lower steel column may be formed by the steps of: placing the connecting member on the upper end opening of a steel column having openings at both ends in the longitudinal direction and having a hollow rectangular horizontal cross-section; fixing the two plate-shaped members having bolt through holes on the connecting member such that each side of the cross shape in plan view faces parallel to a predetermined side of the steel column; and welding the connecting member to the upper opening of the steel column.

[0013] In the step of fixing the two plate-like members onto the joining member, the lower parts of the two plate-like members may be fixed to the joining member with bolts and / or welding, depending on the cross-sectional shape of the two plate-like members. [Effects of the Invention]

[0014] According to the present invention, steel columns can be joined together without using erection pieces. [Brief explanation of the drawing]

[0015] [Figure 1] An overall view showing an example of a steel column in an embodiment. [Figure 2] A diagram showing an example of an unfolded view of a steel column in an embodiment. [Figure 3] Flowchart of the method for erecting steel columns in the embodiment. [Figure 4]An enlarged view showing an example of the joint structure of the steel column in the embodiment. [Figure 5] An enlarged view showing an example of the joint structure of the steel column in the embodiment. [Figure 6] An overall view showing an example of the welded steel column in the embodiment. [Figure 7] Flow of the method for forming the lower steel column in the embodiment [Figure 8] A diagram showing the positional relationship among the plate member, the joint member, and the lower steel column.

[0016] [1] Example Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 is an overall view showing an example of the steel column 10 in the embodiment. FIG. 1 shows a perspective view of the steel column 10 as seen obliquely from above.

[0017] By joining a plurality of steel columns 10 in the vertical direction, a steel column longer than a single steel column 10 can be established. In the following description and each figure, for convenience of explanation, in the two steel columns 10 to be joined, the steel column 10 arranged at the lower stage is referred to as the lower steel column 11, and the steel column 10 arranged at the upper stage is referred to as the upper steel column 12, respectively. That is, the structures of the lower steel column 11 and the upper steel column 12 are basically the same. In FIG. 1, in the upper steel column 12, the structure corresponding to the joint portion 110 is not shown. In the upper steel column 十二 which is the uppermost steel column 10 of the steel column 10, it does not have to have the structure of the joint portion 110, and in the lower steel column 11 which is the lowermost steel column of the steel column 10, it does not have to have the fixing portion 120.

[0018] The steel column 10 has openings O at both ends in the longitudinal direction, and the horizontal cross-sectional shape is a hollow rectangle. In this embodiment, the shape of the steel column 10 is a hollow square column, but the shape of the steel column 10 is not limited to this. The shape of the steel column 10 may be, for example, a shape in which the joint portion 110 described later can be welded to the upper end opening O of the lower steel column 11. Specifically, in a shape other than a hollow square column, it is a shape such as a prismatic column having two or more opposite hollow sides and a hollow cylinder.

[0019] The lower steel column 11 has a joint portion 110. The joint portion 110 is a structure for joining the lower steel column 11 and the upper steel column 12. The joint portion 110 has a joining member 111, a cross portion 112, and bolt through-holes 113.

[0020] The joining member 111 is a member welded to the upper end opening O. The joining member 111 is a member that serves as a base for fixing the cross portion 112. The shape of the joining member 111 is, for example, a flat plate. The cross portion 112 has a cross shape in plan view and is a member fixed to the upper surface of the joining member 111. The cross portion 112 is formed from, for example, two plate-like members 1121 and 1122. Here, the "two plate-like members" means that the cross portion 112 has a shape as if it were a combination of two plate-like members as a whole, regardless of whether the cross portion 112 is actually composed of two plate-like members. The cross portion 112 may be, for example, formed by joining four plate-like members at the center, or may be formed by joining two short plate-like members to both sides of one long plate-like member, or may be formed by joining or simply combining two plate-like members with a groove formed at the center. In the case of a hexagonal column and an octagonal column, the cross portion 112 has an X shape instead of a cross shape according to the opposite sides. The bolt through-holes 113 are holes provided on the surfaces corresponding to each side of the cross shape in the cross portion 112.

[0021] Also, at least one bolt through-hole 113 is formed on each surface corresponding to each side of the cross shape. In this embodiment, four circular bolt through-holes 113 are formed, one on each surface, for a total of four. Also, the bolt through-holes 113 are formed at different positions in the vertical direction between the two plate-like members. Also, the bolt through-holes 113 are formed at different positions in the horizontal direction between the two plate-like members. The bolt through-holes 113 may be formed, for example, at a facility such as a factory, or may be machined on-site.

[0022] The upper steel column 12 has a fixing portion 120. The fixing portion 120 has bolt fixing holes 121. Figure 2 is a diagram showing an example of an unfolded view of the steel column 10 in the embodiment. Figure 2 schematically shows an enlarged view of the unfolded view of the upper steel column 12 shown in Figure 1.

[0023] The bolt fixing holes 121 are holes provided in positions opposite to the bolt through holes 113 in the joint 110 of the lower steel column 11 of the side wall (peripheral wall). In this embodiment, eight circular bolt fixing holes 121-1 to 128 are formed. "Opposite positions" means that when each bolt fixing hole 121 is viewed from the direction normal to its surface, the bolt fixing hole 121 and the bolt through hole 113 are in the same (i.e., overlapping) position. Although two bolt fixing holes 121 are formed in each side wall, it is desirable for the stability of the steel column that these two bolt fixing holes 121 be in positions symmetrical with respect to the center line (not shown) extending vertically from each side wall. However, the positions of the bolt fixing holes 121 and the bolt through holes 113 may not be symmetrical with respect to the center line, but may be shifted to the left or right. If we refer to the side walls in the unfolded diagram as side wall A, B, C, and D from left to right, then side wall A and side wall C face each other, and side wall B and side wall D face each other. Therefore, bolt fixing holes 121-1 and 121-2 of side wall A and bolt fixing holes 121-5 and 121-6 of side wall C are in corresponding positions. Also, bolt fixing holes 121-3 and 121-4 of side wall B and bolt fixing holes 121-7 and 121-8 of side wall D are in opposing positions.

[0024] Furthermore, the positions of the bolt fixing holes 121 differ between adjacent side walls. Specifically, the bolt fixing holes 121-1 and 121-2 on side wall A are located further from the bottom and shorter from the left (or right) end compared to the bolt fixing holes 121-3 and 121-4 on side wall B. This configuration is the same for side walls C and D. The bolt fixing holes 121 may be formed, for example, in a factory or other facility, or they may be machined on-site.

[0025] Figure 3 is a flowchart showing the method for erecting the steel column 10 in the embodiment. The construction method for erecting the lower steel column 11 and the upper steel column 12 will be described below. In this example, the lower steel column 11 and the upper steel column 12 are transported to the site with the joint portion 110 and fixing portion 120 formed in advance at the factory, and workers join the lower steel column 11 and the upper steel column 12 at the site.

[0026] First, the worker erects the lower steel column 11 (step S101). The worker uses heavy machinery such as a crane and forklift to place the lower steel column 11 on a pre-prepared foundation (for example, concrete). The worker also uses fixing members such as anchor bolts (not shown) to secure the lower steel column 11 to the foundation. A worker refers to a construction worker who performs a specific task.

[0027] Next, the worker places the upper steel column 12 on the lower steel column 11 (step S102). The worker temporarily places the upper steel column 12 on the lower steel column 11 using, for example, a transport machine so that the positions of each bolt fixing hole 121 and each bolt through hole 113 are aligned. At this stage, the upper steel column 12 is simply placed on top of the lower steel column 11, and the two steel columns 10 are not yet joined together.

[0028] Next, the worker inserts the bolt (step S103). For example, the worker inserts the bolt 13 through the bolt fixing hole 121 on one side of the upper steel column 12, and inserts the bolt through the bolt through hole 113 and the bolt fixing hole 121 on the other side facing the first side. Prior to inserting the bolt, the worker adjusts the verticality and horizontal position of the steel frame.

[0029] Next, the worker secures the bolts (step S104). For example, the worker secures the bolts 13 that protrude outward from one side and the opposite side of the upper steel column 12 with nuts. It is desirable that the bolts 13 be high-strength bolts (high-tensile bolts) in order to prevent the upper steel column 12 from falling over.

[0030] Figure 4 is an enlarged view showing an example of the joint structure of the steel column 10 in the embodiment. Figure 4(a) shows a cross-sectional view of the steel column 10 shown in Figure 1, viewed from the side in direction a. Figure 4(b) shows a cross-sectional view of the steel column 10 shown in Figure 1, viewed from the side in direction b. These figures show a cross-section passing through the center of the bolt 13. In these figures, multiple bolts 13 are distinguished as bolt 13-1, bolt 13-2, ..., etc. Because the positions of the bolt fixing holes 121 and bolt through holes 113 are at different heights from the joint member 111 in directions a and b, bolts 13-1 and 13-2 and bolts 13-3 and 13-4 are at different heights from the joint member 111 and do not interfere with each other.

[0031] Figure 5 is an enlarged view showing an example of the joint structure of the steel column 10 in the embodiment. Figure 5 shows a top view of the steel column 10 shown in Figure 1. As shown in the figure, the lower steel column 11 and the upper steel column 12 can be joined by fixing the joint part 110 and the fixing part 120 with bolts 13 and nuts 14.

[0032] Next, the worker welds the steel column 10 (step S105). Figure 6 is an overall view showing an example of a welded steel column 10 in this embodiment. The worker welds, for example, the point W1 where the upper end opening side of the lower steel column 11 and the lower end opening side of the upper steel column 12 meet. Figure 6 shows a perspective view of the steel column 10 (i.e., the welded lower steel column 11 and upper steel column 12) from diagonally above. With this, the steel column 10 can be erected. The worker may remove the bolts 13 after welding the upper steel column 12 and the lower steel column 11. In this structure, unlike erection pieces that are normally used, the sides of the lower steel column 11 and the upper steel column 12 are not covered, so the welding work between the upper end opening side of the lower steel column 11 and the lower end opening side of the upper steel column 12 is not obstructed.

[0033] The above flowchart for the erection method of the steel column 10 describes an example in which the lower steel column 11 and the upper steel column 12 are transported to the site with the joints 110 and fixing parts 120 already installed, and the steel column 10 is erected. However, as a preliminary step, the process of installing the joints 110 and forming the bolt fixing holes 121 is carried out in advance at a factory or other facility before being transported to the site. The method for forming the lower steel column 11 will be described below.

[0034] Figure 7 shows a flowchart of the method for forming the lower steel column 11 in the embodiment. The method for forming the lower steel column 11 will be described below.

[0035] First, the worker installs the connecting member 111 (step S201). For example, the worker places the connecting member 111 on the upper end opening O of the lower steel column 11.

[0036] Next, the worker fixes the cross section 112 (step S202). For example, the worker fixes and welds two cross sections 112, each having a bolt through hole 113, onto the connecting member 111 in a position where each side of the cross shape in plan view is parallel to a predetermined side of the lower steel column 11. Figure 8 shows the positional relationship between the cross section 112, the connecting member 111, and the lower steel column 11.

[0037] Furthermore, the two plate-like members of the flat plate portions 1121 and 1122 (i.e., the cross portion 112) may be fixed to the joining member 111 at their lower ends by bolts and / or welding, depending on their cross-sectional shape. When the cross portion 112 is L-shaped in cross-sectional view (from direction a or direction b), the lower end surface may be fixed to the joining member with bolts. In addition, L-shaped and I-shaped cross portions 112 may be used in combination.

[0038] Next, the worker welds the connecting member 111 (step S203). For example, the worker welds and fixes the connecting member 111 to the upper end opening O of the lower steel column 11.

[0039] Finally, the worker forms bolt fixing holes 121 in the upper steel column 12 (step S204). The worker uses tools such as an electric drill and a plasma torch to form bolt fixing holes 121 in the lower side surface of the upper steel column 12, aligning them with the bolt through holes 113.

[0040] According to this embodiment, the steel columns 10 can be temporarily joined together more easily without using erection pieces. In other words, compared to the case where erection pieces are used, the amount of work required to cut the erection pieces on-site at the end can be reduced, shortening the working time related to erection pieces and simplifying the work process. Furthermore, instead of fixing the upper steel column 12 and the lower steel column 11 by welding, the joint 110 and fixing part 120 can be left as they are, allowing for a more stable erection. In addition, since it does not cover the sides of the lower steel column 11 and the upper steel column 12 as an erection piece would, it does not interfere with the welding work between the upper end opening side of the lower steel column 11 and the lower end opening side of the upper steel column 12. Furthermore, the overall weight of the steel column 10 can be reduced compared to the case where erection pieces are used. In addition, by not using erection pieces, it becomes possible to design the steel column 10 independently of erection pieces, which increases the freedom of architectural design, especially for special shapes.

[0041] [2] Variant The present invention is not limited to the embodiments described above, and various modifications are possible. Two or more of the modifications described below may be combined.

[0042] (1) Shape of the connecting member In the above embodiment, the shape of the joining member 111 was a flat plate, but it is not limited to this. The shape of the joining member 111 may be, for example, a grid, a beam, or the like, as long as it has sufficient strength to support the plate-shaped member.

[0043] (2) Arrangement shape of plate-shaped members In the above embodiment, the arrangement of the cross section 112 was a (single) cross shape in plan view, but is not limited to this. The shape of the cross section 112 may be, for example, a grid (multiple crosses). Also, depending on the cross-sectional shape of the polygonal column, it may be an X shape.

[0044] (3) Number of holes In the above embodiment, there was one bolt through-hole 113 per face, or four in total, and two bolt fixing holes 121 per face, or eight in total. However, these numbers are not limited to these. For example, two or more bolt through-holes 113 may be formed per face depending on the dimensions of the upper steel column 12 and lower steel column 11 being constructed.

[0045] (4) Shape of the hole In the above embodiment, the shape of the bolt through hole 113 and the shape of the bolt fixing hole 121 were circular, but these shapes are not limited to this.

[0046] (5) Processing location In the above embodiment, the steel columns 10 (especially the lower steel column 11) were processed in advance at a factory or other facility, but this is not limited to this. Workers may, for example, bring the joint 110 and the steel column 10 separately to the site and weld the joint 110 to the steel column 10 on site. In other words, at least a part of the flow of the method for forming the lower steel column 11 in Figure 7 may be performed on site.

[0047] (6) Formation order In the above embodiment, the formation of the lower steel column 11 in Figure 7 was performed after the installation of the joint 110 (steps S201-203), but the order is not limited to this. For example, the worker may first form the bolt fixing holes 121 (step S204) in line with the planned position of the bolt through holes 113, and then install the joint 110 (steps S201-203).

[0048] Alternatively, the order of steps S202 and S201 may be reversed, and the cross portion 112 having bolt through holes 113 may be fixed to the upper surface of the connecting member 111, and then the connecting member 111 may be placed on the upper end opening O of the lower steel column 11, and then step S203 may be performed. [Explanation of Symbols]

[0049] 10...Steel column, 11...Lower steel column, 12...Upper steel column, 13...Bolt, 14...Nut, 110...Joint, 111...Jointing member, 112...Cross section, 113...Bolt through hole, 120...Fixing section, 121...Bolt fixing hole

Claims

1. The joint structure for upper and lower steel columns has openings at both ends in the longitudinal direction and a hollow rectangular horizontal cross-section, The aforementioned lower steel column is A joint member welded to the upper end opening, Having a cross shape in plan view, two plate-like members fixed to the upper surface of the joining member, Bolt through holes provided on the surfaces corresponding to each side of the cross shape and It has a joint having, The aforementioned upper steel column is Bolt fixing holes provided in the joint portion of the lower steel column of the side wall, opposite to the bolt through holes. It has a fixing part having, A joining structure in which the joint and the fixing part are fixed with bolts and nuts, thereby joining the lower steel column and the upper steel column.

2. At least one bolt through-hole is formed on each face corresponding to each side of the cross shape. The joining structure according to claim 1.

3. The bolt through holes are formed at different positions in the vertical direction between the two plate-like members. The joining structure according to claim 2.

4. The bolt through holes are formed at different positions in the horizontal direction between the two plate-like members. The steel column joining structure according to claim 3.

5. A steel column body having openings at both ends in the longitudinal direction and a hollow rectangular horizontal cross-section, A joint provided at one end in the longitudinal direction, The fixing portion provided at the other end in the longitudinal direction and It has, The aforementioned joint is A joint member welded to the upper end opening, Having a cross shape in plan view, two plate-like members fixed to the upper surface of the joining member, Bolt through holes provided on the surfaces corresponding to each side of the cross shape and It has, The aforementioned fixing part is Bolt fixing holes provided in the side wall of the steel column body at a position opposite to the bolt through holes in the joint of the lower steel column A steel column having [a certain feature].

6. A construction method for erecting an upper steel column and a lower steel column having the joint structure described in claim 1, The steps for erecting the lower steel columns, The steps include installing the upper steel column on the lower steel column, The steps include inserting a bolt through the bolt fixing hole on one side of the upper steel column, and inserting the bolt through the bolt through hole and the bolt fixing hole on the other side facing that side, The steps include: fixing the bolts protruding outward from one side and the other side with nuts; A step of welding the upper end opening side of the lower steel column to the lower end opening side of the upper steel column. A method for erecting steel columns having [a specific feature / feature].

7. The step of placing the connecting member on the upper end opening of a steel column having openings at both ends in the longitudinal direction and having a hollow rectangular horizontal cross-section, The steps include fixing the two plate-shaped members having bolt through holes onto the joining member such that each side of the cross shape in plan view faces a predetermined side of the steel column parallel to it, and Steps to weld the connecting member to the upper opening of the steel column. The method for erecting a steel column according to claim 6, wherein the lower steel column is formed by the above method.

8. In the step of fixing the two plate-like members onto the joining member, the lower part of the two plate-like members is fixed to the joining member with bolts and / or welding, according to the cross-sectional shape of the two plate-like members. A method for erecting a steel column according to claim 7.

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