JP3000016U - Joint structure of circular section steel pipe columns - Google Patents

Abstract

(57) [Summary] [Purpose] To realize a joint structure that does not require advanced technology, has good workability, high joint reliability, and excellent appearance. [Structure] A flange 31 attached to the upper end of a large diameter lower steel pipe 1 via a flange 11 and attached to the upper end of a smaller diameter upper steel pipe 2 and a short pipe 3 of the same diameter, and a lower end of the upper steel pipe 2 It is configured by bolting the flange 21 attached to the. And ribs 12, 22, and 32 on both sides of each joining bolt.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint structure for a circular cross-section steel pipe column, and more particularly to a joint structure for a circular cross-section steel pipe column at portions having different diameters in the vertical direction.

[0002]

[Prior art]

 In recent years, large-diameter steel pipe is often used as a pillar material for structures. Aside from the case of so-called steel structures such as buildings, when using large diameter steel pipes as independent columns, it is uneconomical to use steel pipes of the same diameter up to the upper end, so at the joint position in the height direction. It is often designed to gradually reduce the diameter.

Various conventional joint structures have been adopted for circular cross-section steel pipe columns in the upper and lower portions having different diameters, and typical ones will be described with reference to FIGS. 2 to 4. FIG. 2 shows a case in which a tapered short pipe 4 having both ends matched with these diameters is inserted in the middle of a large-diameter lower steel pipe 1 and a smaller-diameter upper steel pipe 2, respectively. Is usually welded to the lower steel pipe 1 or the upper steel pipe 2 at the manufacturing stage in the factory and brought in, and the upper steel pipe 2 is connected to the upper steel pipe 1 on the lower steel pipe 1 during the on-site construction work. The lower end of the upper steel pipe 2 is locally welded.

This joint structure has a simple structure and a smooth and beautiful appearance, and even if there is a flag or a net attached to a pillar, there is an advantage that ropes are not caught in the joint. Since the work is horizontal welding in a horizontal position in high places and not only requires a high level of welding technology, but also is greatly affected by the weather such as rain and wind, the workability and reliability are low. There is. It is difficult to manufacture the tapered short tube 4.

In the structure shown in FIG. 3, an upper steel pipe 2 having a diameter smaller than that of a lower steel pipe 1 having a large diameter is inserted, and a filler 5 such as mortar is injected into a void portion due to a difference in diameter and cured. In addition to being simple in structure and appearance, it does not require particularly advanced techniques, but mortar injection at high altitude is a dangerous and difficult task. As a result, there is a problem that mortar requires a curing and curing period, and the reliability of the mortar and the contact portion between the mortar and the steel pipe is low with respect to impact and repeated loading.

FIG. 4 shows that the flanges 11 and 21 are attached to the joint ends of both the large-diameter lower steel pipe 1 and the smaller-diameter upper steel pipe 2 and are reinforced by a plurality of ribs 12 ′ and 22. , Flanges 11 and 21 are joined by bolts. This joint structure only requires bolt tightening work as on-site work, does not require advanced technology, is not particularly dangerous work, and if high-strength bolts are used, the joint reliability is also high. Although it is high, the outer diameter of the flange portion is larger than the diameter of the lower steel pipe 1, so that not only the appearance is bad, but also there is a problem that a net or rope is easily wound around this portion.

[0007]

[Problems to be solved by the device]

 An object of the present invention is to solve these problems, to provide a joint structure that is highly reliable, has good workability, does not require advanced technology, and has an excellent appearance.

[0008]

[Means for Solving the Problems]

 The present invention, in a joint structure of circular cross-section steel pipe columns in parts with different diameters in the upper and lower parts, uses a short pipe with the same diameter as the upper steel pipe with a diameter smaller than that attached to the upper end of the lower diameter steel pipe with a flange. This is a joint structure of a steel pipe column with a circular cross section, in which a flange attached to the upper end and a flange attached to the lower end of the upper steel pipe are joined by bolts. The above-mentioned joint structure of a steel pipe column with a circular cross section is provided between the pipe and the flange by providing a rib that does not project outward from the outside diameter of the flange.

[0009]

[Work]

 According to the present invention, since the on-site connection work of steel pipe columns is only bolt connection, advanced technology is not required, and it is not particularly dangerous work. If a high strength bolt is used, the reliability of the joint is also high. Also, the outer diameter of the flange is almost equal to the diameter of the lower steel pipe, the joint does not project, and the heads of the flange connecting bolts are hidden by the ribs on both sides, and ropes may wind up. Nor.

[0010]

【Example】

 One embodiment of the present invention is shown in FIG. This figure is a front view (partially cutaway view) showing the joined parts of the upper and lower steel pipes in a joined state. 1 is a lower steel pipe with a larger diameter, 2 is an upper steel pipe with a smaller diameter than this, 3 is a short pipe for joining Then, 11, 21, and 31 are flanges attached to the respective tube ends, 12, 22, and 32 are reinforcing ribs, and 33 is a lifting eyepiece. A-A shows a joint surface.

A flange 11 having an outer diameter of 860 mm, an inner diameter of 510 mm and a plate thickness of 28 mm is attached to the upper end of a lower steel pipe 1 having a diameter of 800 mm. It is appropriate that the outer diameter of the flange 11 is slightly larger than the outer diameter of the lower steel pipe 1 to the extent that a T-shaped groove for welding can be formed. When the groove is provided, the outer diameter of the flange 11 can be made flush with the outer diameter of the lower steel pipe 1. Between the inner surface of the lower steel pipe 1 and the lower surface of the flange 11, a rib 12 of a reinforcing hook is appropriately attached.

On the other hand, on the upper part of the flange 11, a short pipe 3 for joining having a diameter of 600 mm, which is the same as the upper steel pipe 2, is attached by welding. Therefore, it is necessary that the inner diameter of the flange 11 is smaller than the inner diameter of the short pipe 3 so that at least a T-shaped groove for welding can be formed. The length of the short pipe 3 is 150 mm, and a flange 31 for joining is attached to its upper end. It is preferable that the flange 31 has the same outer diameter, inner diameter, and plate thickness as that of the flange 11 in terms of manufacturing and appearance.

Since the same steel pipe as the upper steel pipe 2 can be used as the material of the short pipe 3, it is extremely easy to manufacture as compared with the taper pipe shown in FIG. 2 above. Radial reinforcing ribs 32 are appropriately attached to the outer surface of the short pipe 3. Furthermore, attaching an eyepiece 33 for lifting to the inner surface of the short pipe 3 is convenient for carrying out from the factory or construction work on site.

Since all the above manufacturing is performed in the factory, each welding and the like can be performed carefully and accurately. A flange 21 and a radial reinforcing rib 22 are attached to the lower end of the upper steel pipe 2. The flange 21 has the same dimensions as the flange 31, and the plate thickness is 28 mm. The flange 21 and the flange 31 are appropriately formed with bolt holes for joining at a plurality of locations.

The ribs 22 are provided at least on both sides of the bolt. The rib 22 not only reinforces the joint between the upper steel pipe 2 and the flange 21, but also hides the head portion of the joint bolt attached between the ribs and prevents the rope from being caught. It goes without saying that the rib 22 does not project outward from the outer diameter of the flange, but the rib 22 has a triangular shape, a trapezoidal shape, or a streamlined shape using a curve as shown in FIG. It is also aesthetically pleasing to align with the ribs 32 of the short pipe 3.

The connection between the lower steel pipe 1 and the upper steel pipe 2 in the present invention is made by bolting the flange 21 and the flange 31 on the surface indicated by AA by interposing the short pipe 3. It is desirable to use high strength bolts. According to the joint structure of the present invention, the outer diameters of both the flange 21 and the flange 31 are substantially equal to the outer diameter of the lower steel pipe 1, and the joint portion does not particularly project so that not only the appearance is excellent, but also the rope. There is no such thing as winding around.

Further, the joining work is only the tightening of the bolts, but since both the bolts and the nuts are exposed above and below the flange surface, the tightening work can be performed easily and surely, and especially the work is involved. There is no danger.

[0018]

EFFECTS OF THE INVENTION According to the present invention, there is an excellent effect that a joint structure having high reliability, good workability, and no high technology is realized.

[Submission date] February 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

A flange 11 having an outer diameter of 860 mm, an inner diameter of 510 mm and a plate thickness of 28 mm is attached to the upper end of a lower steel pipe 1 having a diameter of 800 mm. It is appropriate that the outer diameter of the flange 11 is slightly larger than the outer diameter of the lower steel pipe 1 to the extent that a T-shaped groove for welding can be formed. When the groove is provided, the outer diameter of the flange 11 can be made flush with the outer diameter of the lower steel pipe 1. Between the inner surface of the lower steel pipe 1 and the lower part of the flange 11, a rib 12 for reinforcement is appropriately attached.

[Brief description of drawings]

FIG. 1 is a front view (partially sectional view) showing a configuration of an embodiment of the present invention.

FIG. 2 is a front view showing a conventional technique.

FIG. 3 is a front view showing another conventional technique.

FIG. 4 is a front view showing still another conventional technique.

[Explanation of symbols]

 1 Lower steel pipe 11 Flange 12 Rib 2 Upper steel pipe 21 Flange 22 Rib 3 Short pipe 31 Flange 32 Rib 33 Eyepiece 4 Short pipe 5 Filler

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 21, 1994

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukimasa Emma 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Hibiya International Building, Kawasaki Steel Co., Ltd. Tokyo Head Office (72) Ichiya Usui Uchiyuki-cho, Chiyoda-ku, Tokyo 2-3 2-3 Hibiya International Building Kawasaki Steel Co., Ltd. Tokyo Head Office

Claims (2)

[Scope of utility model registration request] 1. In a joint structure of circular cross-section steel pipe columns in portions having different diameters in the vertical direction, an upper steel pipe having a diameter smaller than that attached to an upper end of a lower steel pipe (1) having a large diameter via a flange (11). A steel pipe column with a circular cross section formed by bolting a flange (31) attached to the upper end of a short pipe (3) having the same diameter as 2) and a flange (21) attached to the lower end of the upper steel pipe (2). Joint structure. 2. Ribs (12, 21) which do not project outward from the flange outer diameter, between the steel pipes (1, 2) or short pipes (3) on both sides of each joint bolt and the flanges (11, 21, 31). 22, 32) are provided, The joint structure of a steel pipe column with a circular cross section according to claim 1.