JPH0712484Y2 - Sealed steel pipe column joining member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a joint of a closed steel pipe column such as a square column having a quadrangular cross section or a circular steel pipe column having a circular cross section with a beam or a column to column joint. The present invention relates to a joining member used for a part.

[Prior Art] Since a closed steel pipe having a closed cross-sectional shape such as a quadrangle or a circle has a large second moment of area and is excellent in strength, it can be used as a pillar of a building in the same manner as I-shaped steel. Or it is more widely used.

[Problems to be solved by the invention] However, when such a closed steel pipe is used as a pillar, it is difficult to perform the fastening work in the pillar because the cross-sectional shape is closed, and the I-shaped Compared to the case where a steel material having an open cross-sectional shape such as steel is used, there is a problem that the columns and beams or the columns cannot be easily connected by fastening members such as bolts and nuts.

On the other hand, it is conceivable to dispose a tapped metal fitting in advance in a joint portion in a closed type steel pipe column, connect the column to a beam or another column, and then bolt-join from the outside. However, in this case, when a torque (rotational force) of a certain level or more acts on the bolt, a so-called "co-rotation" occurs in which the metal fitting that cuts the tap rotates with the bolt, and a sufficient fastening force cannot be obtained. is there. In addition, the shaft of the bolt is subjected to torque and tensile force, so that it is not in a desired stress state.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and an object thereof is to provide a joining member capable of easily joining a sealed steel pipe column and a beam or another column without causing co-rotation. I am trying.

[Means for Solving the Problem] The joint member for a closed-type steel pipe column of the present invention is at least a joint member for a closed-type steel pipe column used in a joint portion of a closed-type steel pipe column with a beam or a joint portion between columns. A bolt having threaded threads formed at both ends and a nut screwed to the bolt are provided, and a pawl protruding inward in the radial direction is provided at an end of an internal thread of the nut, and the inside of a sealed steel pipe column It is equipped with a tapped metal fitting having a L-shaped cross section, which is installed at the joining point and has a screw hole.

In carrying out the present invention, the thread may be formed over the entire length of the bolt if a sufficient reaction force can be obtained from the tapped metal fitting with respect to the thrust at the time of bolt fastening. On the other hand, if a sufficient reaction force cannot be obtained from the tapped metal fittings, the thread is formed only on the part of the specified length from both ends of the bolt, and the non-threaded part where the thread is not formed is stepped. Is preferably provided, and the shoulder portion of the stepped portion comes into contact with the steel pipe column plate material to obtain a reaction force.

Further, the pawl provided on the nut prevents relative rotation between the bolt and the nut when the reaction force is not applied to the bolt, and causes the bolt and the nut to rotate integrally at the same time, but the reaction force is added to the bolt. It is preferable to set the dimensions, strength, arrangement and the like so that the bolts and nuts are broken when they are damaged and the relative rotation of the bolt and the nut is allowed.

[Operation] In order to join the closed-type steel pipe column to the beam or other column according to the present invention having the above-described structure, first, the steel pipe column and the beam or other column are arranged at predetermined positions. Then, the bolt is inserted from one end into a bolt hole formed in a steel pipe column or a beam. Inside the steel pipe pillar, a tapped metal fitting having a screw hole formed at a position corresponding to the bolt hole is installed in advance.

When the nut screwed to the other end of the bolt is rotated in this state, the pawl acts as a rotation stop against the relative rotation of the nut and the bolt, so that the bolt and the nut rotate integrally, and the tapped metal fitting It is inserted while being screwed into the screw hole. When the bolt is inserted by a predetermined amount and a reaction force larger than a predetermined value is generated at the tip of the bolt or the bolt shaft portion, the pawl of the nut is broken and the bolt and the nut are allowed to rotate relative to each other. As a result, only the nut rotates and moves over the bolt, tightening the steel tube column or beam. As a result, no torque acts on the bolt shaft portion, only tension acts on the bolt shaft portion, so that a suitable stress state is achieved. Therefore, according to the joining member of the present invention, the tapped metal fitting does not rotate together, and the joining is performed securely by a simple operation of inserting the bolt from the outside of the steel pipe column or beam and rotating the nut. be able to.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an embodiment in which a closed type steel pipe column 10 having a rectangular cross section and a beam 12 are joined together. A bolt hole 16 is drilled in the end plate 14 of the beam 12, and the plate material of the joint surface of the steel pipe column 10 is formed.
Bolt holes 20 are also drilled in 18. And bolt hole 1
A tapped metal fitting 24 having an L-shaped cross section and having a screw hole 22 formed at a position aligned with 6 and 20 is arranged inside the steel pipe column 10 and at a joint with the beam 12 by a known means.

A bolt 26 is inserted or screwed into the bolt holes 16 and 20, and the screw hole 22, and a nut 28 is screwed into the bolt 26. The bolt 26 and the nut 28 are shown in FIG. 4 or FIG. 5, the details of which will be described later. In addition,
In FIG. 1, reference numeral 30 denotes a reinforcing rib integrally formed with the tapped metal fitting 24, and the reinforcing rib 30 is for preventing the deformation of the steel pipe column 10.

2A and 2B show the joints 40 between the steel pipe columns 10A and 10B (FIG. 2A).
An example in which the connection plate (splice plate) 42 is used for joining in FIG. In FIG. 2B, a bolt hole 44 is bored in the connecting plate 42, and a bolt hole 20A is also bored in the plate material 18A of the steel pipe column 10A. A metal fitting 24A with a tap is arranged inside the steel pipe column 10A by a known means, and bolt holes 44, 2
A screw hole 22A is formed in alignment with 0A. A bolt 26 is inserted or screwed into the bolt holes 44, 20A and the screw hole 22A, and a nut 28 is screwed into the other end of the bolt 26. The bolt 26 and the nut 28 have the same structure as that of the embodiment shown in FIG.

Next, the bolt 26 and the nut 28 will be described with reference to FIGS. 3 to 7. The embodiment of the bolt shown in FIG. 3A is used when a sufficient reaction force can be obtained from the tapped metal fitting, and the entire bolt 26-1 has a thread 50 formed over its entire length. The nut 28 is formed with an internal thread 52 that is screwed with the thread 50. And
Internal thread of nut 28, as shown in FIGS. 3B and 5.
A pawl 54 protruding inward in the radial direction is provided at the end of 52.

FIG. 4 shows an embodiment of the bolt when a sufficient reaction force cannot be obtained from the tapped metal fitting. In FIG. 4, threads 50A and 50B are formed on both ends of the bolt 26-2, and a step 58 is provided on the non-threaded portion 56 where the threads are not formed. Then, the female screw portion 52B formed on the nut 28 is screwed into the screw thread 50B. As in the case of the bolt embodiment shown in FIGS. 3A and 3B, the nut 28 shown in FIG. 4 is provided with a barb 54 (FIG. 5).

Next, with reference to FIGS. 6A, 6B and 6C, an aspect of joining the steel pipe column and the beam using the bolt 26-1 shown in FIGS. 3A and 3B will be described.

In FIG. 6A, the threaded hole 22 of the tapped metal fitting 24 is a blind hole, and its end portion 23 provides a sufficient reaction force to the bolt 26-1. And nut
28 is fully screwed into the end of bolt 26-1, and nut
A claw 54 of 28 (FIGS. 3B and 5) presses the thread of the bolt 26-1 to rotate the nut 28 and the bolt 26-1 integrally. In this state, if the nut 28 is rotated as shown by arrow R, the bolt 26-1 rotates together with the nut 28 and is screwed into the screw hole 22 of the tapped metal fitting 24. Reference numeral 27 in FIG. 6A indicates a washer.

As shown in FIG. 6B, the end of the bolt 26-1 has a screw hole 22.
When it comes into contact with the terminal end portion 23 of Fig. 6, a reaction force in the right direction in Fig. 6B acts on the shaft of the bolt 26-1 to break the pawl 54. As a result, relative rotation of the bolt 26-1 and the nut 28 is allowed, and only the nut 28 rotates and moves on the bolt 26-1 in the left direction in the drawing. Since the bolt 26-1 does not rotate, the tapped metal fitting 24 does not rotate together. And
When the state shown in FIG. 6C is reached, a predetermined tension acts on the bolt 26-1 and the end plate 24 of the beam and the plate member 18 of the steel pipe column are reliably joined.

FIG. 7 shows the end plate 14 of the beam using the bolt 26-2 shown in FIG.
The mode which joins and the plate material 18 of a steel pipe pillar is shown. Sixth
In the case of FIGS. A to C, the screw hole 22 of the tapped metal fitting 24 is a blind hole and a predetermined reaction force can be obtained by the end portion 23 thereof, but in the case of FIG. 7, the screw hole 22 of the tapped metal fitting 24 is It is a through hole. Therefore, a sufficient reaction force cannot be obtained from the tapped metal fitting 24. Therefore, the non-threaded part of the bolt 26-2
The shoulder portion of the step portion 58 of 56 (Fig. 4) is brought into contact with the steel pipe column 18 to obtain a predetermined reaction force. The operation of the pawl 54 and the like are the same as in the case of FIGS. It should be noted that in the embodiment shown in FIGS. 1 and 2A and 2B, the fourth
Note that the bolt 26-2 shown in FIGS. 7 and 8 is used.

[Effects of the Invention] As described above, according to the present invention, the sealed steel pipe column and the beam or the steel pipe columns are reliably joined by the extremely simple work of inserting the bolt into the bolt hole and rotating the nut. can do. And, at the time of joining, since the member inside the closed shape steel pipe column is prevented from co-rotating with the bolt, torque does not remain on the bolt after fastening and only tensile force acts, so that suitable stress after fastening is achieved. The state is realized.

[Brief description of drawings]

1 is a sectional view showing a first embodiment of the present invention, FIG. 2A is a front view of the second embodiment, FIG. 2B is a sectional view taken along line AA of FIG. 2A, and FIG. 3A. Is a front view showing a bolt and a nut used in the present invention, FIG. 3B is a side view of the nut, and FIG.
FIG. 5 is a front view showing another example of the bolt and nut used in the present invention, FIG. 5 is a sectional front view of the nut used in the present invention, and FIG. 6A is a fastening with the bolt shown in FIG. 3A. FIG. 6B is a sectional front view showing an initial state, FIG. 6B is a sectional front view showing a state where a reaction force acts on the bolt, FIG. 6C is a sectional front view showing a fastening completed state by the bolt, and FIG. It is a cross-sectional front view which shows the fastening by the bolt shown in FIG. 10, 10A, 10B …… Sealed steel pipe column, 12 …… Beam, 22 …… Screw hole, 24 …… Tap fitting, 26, 26-1, 26-2 …… Bolt, 28 …… Nut, 50, 50A, 50B …… screw thread, 54 …… claw

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display area E04C 3/32 9130-2E (72) Creator Akio Tomita 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Yasushi Aiyama 2-191-1 Tobita Supply, Chofu City, Tokyo Kashima Construction Co., Ltd. Technical Research Institute

Claims (1)

[Scope of utility model registration request] 1. A bolt for which a thread is formed at least at both ends in a joint member for a sealed steel pipe column used for a joint portion between a beam and a joint portion between columns of the sealed steel pipe column, and a bolt for the bolt. A cross-section L provided with a nut to be screwed, a pawl protruding inward in a radial direction is provided at an end of an internal thread of the nut, and a screw hole is formed at a joint portion inside a sealed steel pipe column. A joint member for a closed type steel pipe column, comprising a metal fitting with a V-shaped tap.