JPH09158320A - Bolting method of closed-sectional column material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent bolting method, by which the screw section of a bolt is not damaged. SOLUTION: A special bolt with a pin tail 4d is arranged beforehand into a closed-sectional column material 21 having a large diameter by a bolt supporter installed into a column so that the front end of the pin tail is not projected form the external surface of a flange, the bolthole of the flange 22a of a closed-sectional column material having a small diameter is conformed to the bolthole of the flange of the closed-sectional column material having the large diameter, and the pin tail is gripped and the special bolt is pulled up to the outside of the flange 22a and clamped. Accordingly, the closed-sectional column members can be clamped surely and safely without damaging the clamping bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt joining method for a column member having a closed cross section such as a square steel pipe and a circular steel pipe.

[0002]

2. Description of the Related Art Recently, a column member having a closed cross section such as a square steel pipe or a circular steel pipe has been increasingly used as a column because there is no difference between the strong axis and the weak axis in terms of shape.

As a method of joining pillars having a closed cross section such as square steel pipes and circular steel pipes with bolts, flanges are provided on the outer periphery of the column head of the lower column member and the column base of the upper column member to be joined, and this outer peripheral flange is used. The method of joining with a bolt is adopted. However, such a joining method is not preferable in terms of aesthetics in a pillar in which the joint portion of the pillar can be seen from the outside. It is joined by. However, the welding method has a problem that when welding on site, it is necessary to bring welding equipment to the site, which requires a lot of man-hours, and when carrying out welding at a factory in advance, the transportation efficiency becomes poor. .

From such a point of view, the joining by bolts has been often employed also in the joining of columns and beams having a closed cross section. One method (a method) of bolting columns and beams having such a closed cross-section is described in Japanese Patent Laid-Open No. 6-093661. This is to join an H-shaped steel beam with a split tee to a square steel tubular column.
As shown in FIG. 2, the T-shaped split tee 2 is placed outside the square steel pipe 1, the joint metal 3 is placed inside the square steel pipe 1, the pipe wall of the square steel pipe 1 is sandwiched, and a special bolt is bolted from the inside of the square steel pipe 1. It is fastened through the hole. The special bolt 4 includes a flat round head 4a, a shank 4b, and a male screw portion 4
c, a pin groove 4e formed subsequent to the male screw portion 4c and a pin tail 4d formed in the tip and fitted and fixed to the inner sleeve of the torque wrench so that the bolt does not rotate when the nut is rotated and fastened. ing.

The temporary fixing metal fitting 7 has a cylindrical shape with one end closed and the other end open, and a plurality of slits reaching the opening end are formed in the cylindrical portion, and a rib formed by bending the opening end to the outside. Are formed. The outer diameter of the rib portion can be made smaller by grasping it with pliers or the like, and when released from the pliers, the original diameter is restored by the spring force. As shown in FIG. 8, one end of the tie string 8 is fixed to the temporary fixing metal 7, and the tip of the pin tail of the special bolt 4 is connected to the other end.

Then, the split tee 2 is replaced with the rectangular steel pipe 1.
In order to attach it to the inner wall of the square steel pipe 1 and the split tee 2 on the outer wall of the square steel pipe, the metal fittings 3 in which the temporary fixing metal fittings 7 with the special bolts connected by the string as described above are mounted in the bolt holes in advance. Align the bolt holes and temporarily attach by welding. By hooking the pulling rod on the hook 7a of the temporary metal fitting 7 and pulling it out, the special bolt 4 is inserted into the bolt hole (joint metal, square steel pipe wall and bolt hole of split tee) and fastened with a nut. Is the thing.

Further, another joining method (method B) is disclosed in Japanese Patent Laid-Open No. 62-288237. As shown in FIG. 7, this method is as follows: "First, insert the special bolt 4 into the bolt hole from the inside of the rectangular steel pipe 1. Next, the filler made of foamed resin having the long groove 9a into which the head of the special bolt 4 is inserted. 9 is inserted into the rectangular steel pipe 1 to support the special bolt so that the special bolt does not fall into the rectangular steel pipe 1. The split tee 2 is fastened to the rectangular steel pipe 1 via the special bolt 4 and attached to the split tee 2. Then, the beam 6 is bolted. ”

[0008]

However, even if the above method (a) or (b) is adopted for joining columns with closed cross sections, in the method (a), when the special bolt is pulled into the bolt hole with the tie string, There is a problem that the threaded portion of the bolt hits the corner of the bolt hole of the metal joint, the screw thread is crushed, and the nut cannot be fastened. In addition, the method of B also has a problem that when the split tee 2 is attached to the special bolt protruding from the rectangular steel pipe, there is a great risk of damaging the threaded portion of the special bolt.

An object of the present invention is to provide an excellent bolt joining method for a column member having a closed cross section, which does not damage the threaded portion.

[0010]

The present invention has the following objects.
In the method of bolting a closed cross-section column member through a flange, a bolt having a large diameter closed cross-section column member and a special bolt having a pin tail installed inside so that the tip of the pin tail does not protrude from the outer surface of the flange. Placed and placed by a support tool, after aligning the bolt holes of the flange of the small diameter closed cross-section column member with the flange bolt holes of the large diameter steel pipe member, grasp the pin tail and pull up the special bolt to the outside of the flange. Achieve by the method of fastening.

Since the special bolt is supported inside the column member having a large diameter closed cross section by the bolt support so that the tip of the pin tail does not protrude from the outer surface of the flange, the threaded portion of the bolt may be damaged during flange alignment. Absent. Also,
Since the special bolt is arranged in advance in accordance with the bolt hole and the pin tail of the special bolt is grasped and pulled up, the screw portion is not damaged even at that time.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. INDUSTRIAL APPLICABILITY The present invention can be applied to bolt joining of various closed cross-section column members, but here, a large diameter circular steel pipe column member 21 and a small diameter circular steel pipe column member 22, respectively, as shown in FIG. A case will be described in which the flange 21a and the flange 22a provided at the pipe end of 1 are joined by the special bolt 4 and the nut 10.

(1) As shown in FIG. 4, first, a steel band 25 is attached to the inner wall of a large-diameter circular steel pipe column member 21. At this time, the mounting position of the steel band is L as shown in FIG.
<It may be in the range of _{L B <(L + T)} . here,
L _B : Distance from the bottom surface of the receiving portion 26 _{b of the} bolt support to the tip of the pin tail of the special bolt, L: Receiving portion 26 _b
From the bottom surface to the bottom surface of the flange 21a, T; the thickness of the flange 21a.

(2) Insert the special bolt 4 into the bolt hole 24 from the lower surface of the flange 21a. Next, each bolt support 26 consisting of the receiving portion 26b of the bolt head and the L-shaped piece 26a shown in FIG. 5 is placed with the receiving portion 26b upward so that the center of the receiving portion is aligned with the center of each bolt hole 24. L-shaped piece 26a
Hook the steel band 25.

Further, the special bolt 4 is pulled down and its head 4a is set in the receiving portion 26b of the bolt head. At this time, the tip of the pin tail 4d of the special bolt 4 is located slightly below the upper surface of the flange 21a.

(3) The small-diameter circular steel pipe column member 22 is hung on the large-diameter circular steel pipe column member 21, and the bolt holes of the flanges are aligned with each other.

(4) In FIG. 1, a bolt pulling tool 27 as shown in FIG. 2 (this is a fire pinch type, and its tip pinching portion 27a is formed in a pair of arcs that fit the outer circumference of the pin tail, The inner surface thereof has a plurality of grooves that engage with the vertical grooves on the outer periphery of the pin tail 4d.).
Is narrowed and the tip end sandwiching portion 27a is inserted into the bolt hole 24. FIG. 1 (A)

(5) The pin tail 4d of the special bolt in the bolt hole is grasped by the pulling tool 27. FIG. 1 (B)

(6) Pull up the head of the special bolt 4 until the contact surface of the head contacts the flange 22a. FIG. 1 (C)

(7) With the special bolt 4 pulled up,
Temporarily fixing the pin 2 to the thread trough protruding on the upper surface of the flange 22a
Insert 8 and fix the special bolt 4 to the flange. ;
FIG. 1 (D)

(8) Insert a washer into the thread of the special bolt,
The nut 10 is screwed and fastened. At this time, the bolt is prevented from rotating around by grasping and fixing the pin tail with pliers or the like. ; Figures (E) (F)

The operations (4) to (8) are carried out for the special bolts in the respective bolt holes. After fastening the special bolts, their pin tails are cut off from the shear groove 4e by a screw cutting tool (not shown).

[0023]

According to the method of the present invention, the closed cross-section column member can be securely and safely fastened without damaging the fastening bolt.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a work process of a bolt joining method for a column member having a closed cross section according to the present invention.

FIG. 2 is a perspective view of a pulling tool used in the method of the present invention.

FIG. 3 is a partial cross-sectional view showing a state of a joint portion of a steel pipe pillar material with a different diameter.

FIG. 4 is a partial cross-sectional view for explaining the procedure for positioning a special bolt in the method of the present invention.

FIG. 5 is a perspective view of a bolt support used in the method of the present invention.

FIG. 6 is an explanatory diagram of related dimensions when positioning a special bolt in the method of the present invention.

FIG. 7 is a perspective view illustrating a conventional bolt joining method (closed method) for a column member having a closed cross section.

FIG. 8 is a partial cross-sectional view illustrating a conventional bolt joining method (a method) for a column member having a closed cross section.

FIG. 9 is a cutaway perspective view of a joint portion of a conventional closed cross-section column member joined by the method a.

[Explanation of symbols]

 1 Square Steel Pipe 2 Split Tee 4 Special Bolt 4a Head 4c Male Thread 4e Shear Groove 4d Pintail 10 Nut 21 Large Diameter Round Steel Pipe Column Material 21a Flange 22 Small Diameter Round Steel Pipe Column Material 22a Flange 23 Flange Central Hole 24 Bolt Hole 25 Steel Band 26 Bolt support 27 Bolt lifting device

Claims (1)

[Claims] 1. A method for bolting a closed cross-section pillar through a flange, wherein a special bolt having a pin tail inside a large-diameter closed cross-section pillar is preliminarily prevented from protruding from the outer surface of the flange. Arranged and placed by the bolt support attached to the inside of the pillar, after aligning the bolt hole of the flange of the small-diameter closed cross-section pillar material with the flange bolt hole of the large-diameter closed cross-section material, grasping the pin tail A bolt joining method for a column member having a closed cross-section, wherein a special bolt is pulled up to the outside of the flange and fastened.