JPH1025810A - Beam-to-beam joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase bearing force of a beam-to-beam joint part so as to be able to construct a large structure, and reduce the number of beams to be used so as to increase the freedom of a plan and to reduce cost by arranging dowel washers provided with biting claws at the time of fixing the end part of one beam to a joint hardware bolt-fixed to the side face of the other beam. SOLUTION: In a joint part where the end part of a beam is fixed to a joint hardware 5 bolt-fixed to the side face of a girder 1, dowel washers 15 provided with claws biting into the peripheral parts of bolt holes 18 of the girder 1 are arranged between the side face of the girder 1 and the joint hardware 5. The outer face of a contact part 6 of the joint hardware 5 is brought into contact with the side face of the girder 1 from the outside of the dowel washers 15, 15, and the bolt holes 18 of the girder 1 and bolt holes of the joint hardware 5 are made coincide with each other and positioned. A nut 28 is screwed with a bolt 21 inserted in the bolt hole 18 to fix the joint hardware 5 to the girder 1. With this fastening, the dowel washer 15 is held with the claw biting deep into the peripheral part of the bolt hole 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between beams of a wooden building.

[0002]

2. Description of the Related Art Conventionally, at a joint between a girder and a girder,
As shown in FIG. 5, a contact part (32) of a metal joint (31) formed by bending a metal plate is brought into contact with a side surface of a girder (33) and fixed with a bolt (34). Slits formed on the end face of the small beam (36) with a pair of insertion portions (35) (35) projecting from the portion (32)
(37) Some are inserted into (37) and fixed with bolts (38).

[0003]

In the above-mentioned conventional joint structure, the load applied to the small beam (36) is transmitted from the joint hardware (31) to the large beam (33) via the bolt (34). Is applied in the direction where the force of the girder (33) is weaker. In addition, since a large frame with a long span cannot be formed, there are drawbacks in that the degree of freedom of the plan is limited and the cost is increased.

The present invention solves the conventional drawbacks, increases the strength of the beam-to-beam joint, enables a large frame, and reduces the number of beams to be used. It is an object of the present invention to provide a beam-to-beam joining structure capable of increasing the degree and reducing the cost.

[0005]

In order to solve the above-mentioned problems, according to the present invention, there is provided a beam-to-beam joint in which an end of the other beam is fixed to a joint metal bolted to a side surface of one of the beams. In the part, between the one beam side surface and the joint hardware, a dowel washer having a claw that bites around a bolt hole of the beam into which the bolt is inserted is disposed.

In the above, the above-mentioned dowel washer is an annular shape having a bolt hole, and a plurality of chevron-shaped claws formed along the outer periphery thereof are bent to one surface side of the washer, and is optimally used. .

Further, in the above, the metal joint includes a contact portion and a pair of insertion portions projecting in a direction perpendicular to the contact portion, and the contact portion and a beam side surface to which the contact portion contacts. The dowel is disposed between the abutment, the abutment, the dowel and the bolt inserted through the beam to fix this joint to the side of the beam, and the insertion part is a slit at the other end of the beam. A bolt is provided which is inserted into the beam and inserted through the beam and the insertion portion, and the other beam is fixed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, (1) is a large beam which is one of the beams of the present invention, and (2) is a small beam which is joined to the side surface of the large beam (1). Oh, that little beam
On the joining end face of (2), slits (3) and (3) with a certain depth are provided.
It is formed to penetrate the small beam (2) above and below. Also,
The tip between both slits (3) and (3) is cut off and a small beam
(2) A groove (4) is formed at the center of the tip.

FIG. 5 (5) shows a metal joint similar to the conventional one. (6) is an abutting portion made of a metal plate which abuts against the side surface of the column (1), and the abutting portion (6) has a predetermined interval in the vertical direction as shown in FIG. , And four lower bolt holes (8), (8), which are similarly formed at regular intervals, are formed. I have. Both ends in the left-right direction of the contact portion (6) are bent in a direction perpendicular to the plane, and the insertion portion (9) of the present invention is formed.
(9), and further, the lower ends of these insertion portions (9) and (9) are
Both are bent inward in the horizontal portion to form bottoms (10) and (10).

The insertion portions (9) and (9) have a pair of bolt holes (11) and (12) formed in the vicinity of the upper end and at the lower end, respectively, below and above the upper bolt hole (11). Pin insertion holes (13) (13) are formed on the side of the bolt holes (12). Bolt holes (1
1) is opened to the upper end side by a V-shaped notch (14) cut out from the upper end of the insertion portion (9), whereby a bolt can be dropped from above and inserted.

(15) is a dowel washer of the present invention, as shown in FIG. 4, which is substantially annular with a bolt hole (16) in the center, and has a number of chevron shapes formed along its outer periphery. Nails (1
7) (17) are bent toward one side of the washer (15). Corresponding to this washer (15), around the bolt hole (18) on the side of the girder (1), a countersunk hole (1) corresponding to the thickness of the washer (15) is provided.
9) is formed. (20) and (20) are a pair of nail holes provided in the washer (15). The washer (15) is previously set so that the nail (7) is on the back side. ) And fixed by driving a nail (27) so that it does not rotate when tightening the bolt. That is, the washer (15) is attached to the girder (1) prior to the attachment of the joint metal (5).

At the time of mounting, first, the outer surface of the contact portion (6) of the hardware (5) is attached to the girders from the outside of the dowel washers (15) and (15).
Abut on the side of (1) and bolt holes (18) in the girder (1)
And the bolt holes (7) and (8) of the metal fitting (5) are aligned and positioned, and in this state, the bolt (21) is connected to the bolt holes (7) and (8).
(16) Insert so as to penetrate (18), and tighten the nut (28) screwed to the tip to fix the hardware (5) to the column (1). As a result of this tightening, the dowel (15) is held with the pawl (17) deeply biting into the periphery of the bolt hole (18) of the girder (1) as shown in FIG. In this embodiment, bolts (21) and (21) are respectively inserted into four bolt holes (18) (18).
Are inserted and fixed, and the dowel washer (15) is used only for the two bolts (21) and (21), but may be used for all.

Usually, the hardware (5) is carried into the site in a state where it is fixed in advance, but it is also possible to attach it at the site. Although not shown, when the small beam (2) is also joined to the opposite side surface of the hardware (5), the same hardware (5) is arranged symmetrically with the hardware (5), Similarly, the same bolt (21) and nut (28) are used to fasten and fix together using a dowel (15).

Next, the small beam (2) is inserted into the slit (3) (3).
Then, the insertion portions (9) and (9) are attached so as to be inserted. At this time, of the pair of bolt holes (22) and (23) on the beam (2) side formed so as to correspond to these insertion portions (9) and (9), the bolt holes (22) on the upper side are inserted. Has a bolt (26) attached in advance, and the bolt (23) is
The bolts (2
3) automatically fits into the bolt hole (11), whereby the beam (2) can be positioned.

At this time, the lower surface of the beam (2) is connected to the bottom (10) (1).
0). In this state, the pin insertion holes (24) (24) formed in the
The pin insertion holes (13) and (13) of (9) coincide with each other, and the drift pins (25) are driven into the pin insertion holes (24) and (13) from the side surfaces of the small beam (2). Remaining bolt holes (12) (2
Insert the bolt (26) into 3) and tighten it,
(2) is fixed to hardware (5), and these small beams (2) are
It will be joined to the side of (1).

[0016]

As described above, according to the present invention, the claw is fixed by using a dovetail washer between the joint hardware attached to the other beam side surface and the beam side surface to fix the end of the beam. Since the beam is cut into the side surface of the beam, the load transmitted from the bolt fixing the hardware to the side of the beam having the bolt hole is dispersed and transmitted through the claws of the dowel washer. For this reason, compared with the conventional structure in which the power is transmitted intensively only through the bolts, the maximum strength of this portion is greatly increased, and the span of the beam can be lengthened to form a large frame. Since the number can be reduced, there is an effect that the degree of freedom of design increases and the cost can be reduced.

Further, since the load from the bolt is transmitted from the dowel bracket to the bolt hole, it is possible to prevent the bolt hole from being enlarged and greatly deformed by a horizontal force during an earthquake or the like, and the strength against the horizontal force is also reduced. Will increase.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a joint portion between beams, showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the same joint.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a perspective view showing a relationship between a dowel washer and a bolt hole portion of a beam.

FIG. 5 is an exploded perspective view showing a conventional joint structure between beams.

[Explanation of symbols]

 (1) Large girder (2) Small girder (3) Slit (5) Joint (6) Contact part (9) Insertion part (15) Dowel washer (16) Bolt hole (17) Claw (18) Bolt hole (21 ) Bolt

Claims (3)

[Claims] 1. A beam-to-beam joint in which the end of the other beam is fixed to a joint metal bolted to the side surface of one of the beams, between the one beam side surface and the joint metal. A beam-to-beam joining structure, wherein a dovetail washer having a claw biting around a bolt hole of the beam into which the bolt is inserted is arranged. 2. The beam according to claim 1, wherein said dowel washer is formed in an annular shape having a bolt hole, and is formed by bending a large number of chevron-shaped claws formed along the outer periphery thereof to one surface side of said washer. Beam joint structure. 3. The joining hardware comprises a contact portion and a pair of insertion portions projecting in a direction perpendicular to the contact portion, between the contact portion and a beam side surface to which the contact portion contacts. The abutment is fixed to the side of the beam with bolts penetrating through the abutment, the dowel and the beam, and the insert is inserted into the slit on the other end of the beam. The beam-to-beam joining structure according to claim 1 or 2, wherein the other beam is fixed by a bolt inserted through the beam and the insertion portion.