JPH07252888A - Wood column-beam connecting structure with lug screw bolt - Google Patents

Abstract

PURPOSE:To reinforce a connecting structure by protruding bolt screw sections at both ends of lug screw bolts to column side faces, fastening and fixing the T-head plates of gusset plates to the bolt screw sections of the lug screw bolts with nuts, inserting the T-leg plates of the gusset plates into slits at the end sections of beam members, and driving drift pins to fix them. CONSTITUTION:Through holes 403 of gusset plates 4 are penetrated by end section bolt screw sections 202 of four lug screw bolts 2 screwed and fixed to a column member 1 and fastened by nuts 6, and the gusset plates 4 are fixed to the column member 1. T-leg plates 401 of the gusset plates 4 are inserted into slits 301 of beam members 3. Drift pins. 5 are driven into small holes 404 of the gusset plates 4 and through holes 302 of the beam members 3 corresponding to them to couple and fix them, and the connection is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure for rigidly joining timber columns and beams, particularly columns and beams having a large cross section.

[0002]

2. Description of the Related Art In recent years, large-scale wooden constructions have been constructed in various places, but no sufficient technique has been developed for realizing a rigid frame structure without walls in both the girder direction and the span direction.

A conceivable method of this kind is to insert a double-sided bolt into the column and to bond the column member and the beam member tightly with this bolt. However, it is fatal that the side face of the beam is deeply engaged with the beam mouth end. However, it is difficult to actually adopt this because it has a certain drawback.

Further, a method of inserting deformed reinforcing bars into columns and beams and hardening them with an adhesive has been considered, but there is a drawback that a curing period is required at the time of construction and control of temperature and humidity is required. .

[0005]

DISCLOSURE OF THE INVENTION The present invention makes it possible to simultaneously rigidly join both the girder direction and the straddle direction using wood, which has not been suitable as described above, as described above. Similar to the reinforced concrete structure, the present invention is to provide a new timber column-beam joint structure capable of realizing a two-way rigid frame structure with a wooden structure.

[0006] Another object of the present invention is to use a structural material called glulam with a large cross section to give it a role as a final construction material, thus reducing the cost of internal finishing.
The purpose of the present invention is to provide a new timber pillar-beam joint structure that can secure a wide space with a high degree of freedom.

[0007]

The feature of the timber pillar-beam joint structure according to the present invention made to achieve the above object is that the lug screw thread portion of the shaft portion and the bolt screw portion of the end portion are provided. The lag screw bolt and the steel plate are formed into a T-shape, and the T-shaped head plate is provided with a plurality of through holes through which nuts of the lag screw bolt are tightened. A structure in which a timber column member and a beam member are joined by using a gusset plate in which a plurality of small holes through which the drift pins are fitted are provided in the base plate, and the end portion of the timber beam member is provided. A slit into which the T-shaped leg plate of the gusset plate is inserted,
A through small hole corresponding to the small hole of the T-shaped leg plate is provided,
A plurality of the lag screw bolts are juxtaposed to a wood pillar member and screwed in the horizontal direction so that the bolt screw portions at the ends thereof project to the outside, and through holes of the T-shaped head plate of the gusset plate. The bolt screw portion protruding to the outside is passed through and fastened and fixed by tightening a nut. Further, the T-shaped leg plate of the gusset plate is fitted into the slit of the beam member, and the small holes of these T-shaped leg plates are inserted. Also, a drift pin for shearing force transmission is fitted over the through small hole of the beam member corresponding thereto.

In the above-mentioned structure, the gusset plate is preferably made of a rectangular steel plate having a thickness of several tens of mm to several tens of mm, which is abutted in a T-shape, and is K-shaped welded. The leg plate is generally configured to be inserted into a vertical slit provided at the end of the beam member in a vertical posture. In addition, the lag screw bolt screwed into the pillar member needs to firmly support the gusset plate at several points. Therefore, normally, a through hole is provided at least near the four corners of the rectangular T-shaped head plate. Although provided, the four lag screw bolts penetrating therethrough are arranged side by side so as to threadably penetrate the pillar member, but the present invention is not limited to this, and a fastening portion with a larger number of lag screw bolts (generally, It is also possible to provide an even number such as 6 or 8. The lag screw bolt used in the present invention varies depending on the dimensions of the column member and beam member to be applied, but generally, it can be said that the shaft portion of a round steel bar having a diameter of about 20 to 40 mm is used, for example, in the Examples described below. For example, the valley diameter 2.
A lug screw (spiral screw) having a diameter of 7 cm, a mountain diameter of 3.5 cm, and an angle of 60 degrees is processed, and an end portion of which is threaded with, for example, M27 bolt specifications is used, but the invention is not limited to this. Absent.

Further, in the above construction, the column member and the beam member to be joined are provided with a bolt screw portion at one end side of the lag screw bolt, and one beam member is joined to the column member by fastening this and a gusset plate. May be provided with bolt screw portions at both ends of the lag screw bolt, and the beam member may be joined to the end portions on both sides thereof by penetrating the column member, and further embedded in the column member. It is also possible to embed another group of lag screw bolts in a direction orthogonal to a group of parallel lag screw bolts and join beam members to one column member in three or four directions. .

Furthermore, in the small hole of the T-shaped leg plate into which the drift pin in the above-mentioned structure is fitted and the through small hole of the beam member corresponding thereto, there are a sufficient number of drift pins to bear the shearing force. It is necessary to provide a number that can be fitted, and typically, it is preferable to provide a large number of these at equal intervals around the concentric double circle.

The drift pin is sufficient if it can bear the shearing force between the beam member and the gusset plate, but generally the diameter is about 8 to 22 mm, preferably 14 mm.
It is preferable to use a steel pin of about 19 mm, and the small hole of the T-shaped leg plate of the gusset plate and the corresponding small through hole of the beam member are the inner diameters into which the drift pin is tightly fitted. Is formed to have.

For the pillar member and the beam member to be joined according to the present invention, for example, laminated lumber typified by bay pine laminated lumber is used, but the present invention is not limited to this. For example, a single plate laminated material (LVL). The present invention can be similarly applied to a so-called engineering wood such as) or PSL.

[0013]

According to the present invention having the above-described structure, a bolt having the same spiral screw as the lag screw formed on the shaft portion of the double-cut bolt is screwed into the through hole of the wooden pillar member, and is then brought out of the pillar member. The bolt screw part and the wood beam member can be easily and firmly joined using the T-shaped gusset plate and drift pin, and the beam member is less likely to be caught in the side surface of the column and has an excellent joining structure. Become.

[0014]

EXAMPLES The joining structure of the present invention will be further described below based on the examples shown in the drawings and the results of strength tests.

Example 1 FIG. 1 shows a pillar member 1. In this example, three pieces 101 to 10 of bay pine laminated wood (15 cm × 45 cm) are used.
450m after further secondary bonding of 3 (secondary bonding of 3 layers)
A pillar member 1 having a m-square shape and a length of 4110 mm and having a predetermined shape is prepared, and four positions (illustrated as 140
27m in diameter at each of 1 mm and 2111 mm)
m through-hole (front hole) 104 was formed. Note that FIG. 1 (a)
Is a front view of the pillar member 1 as viewed from the through hole direction, FIG.
Is a side view of the same.

FIG. 2 shows the lag screw bolt 2. In this example, the width (45c) of the pillar member 1 is used.
m), the peak diameter is 3.5 cm, the valley diameter is 2.7 cm, the screw angle is 60 degrees, and the pitch is 10 mm.
And a shaft portion 201 screwed into a lag screw shape,
The shaft portion 201 is provided so as to have a bolt screw portion 202 having an end portion of 5 cm, which is threaded to the M27 bolt specification, in a portion projecting to the outside of the pillar member 1 while being screwed into the pillar member 1. And this lag screw bolt 2
Is screwed into the through hole 104 having a diameter of 27 mm of the pillar member 1 by using a torque wrench as shown in FIG. 2A is an overall view of the lag screw bolt 2, and FIG. 2B is an enlarged view of the same portion.

FIG. 3 shows a beam member (width 200 mm × height 800 mm, length 26) made of laminated lumber made of bay pine.
16 mm) 3 and a slit 301 having a thickness of 11 mm is machined to one end of about 800 mm, and the diameter d is 18 mm.
A large number of through holes (front holes) 302 are formed so that the steel drift pin of (3) can be driven in a circumferential shape. At the corners of the ends of the beam member 3, the following gusset plate 4 is provided at the end of the lag screw bolt 2 protruding from the column member 1.
Is formed with a stepped portion 303 that secures a volume for tightening the nut. 3 (a) is a front view of the beam member 3, FIG. 3 (b) is a side view thereof, and FIG. 3 (c) is a plan view thereof.

FIG. 4 shows a state in which four M27 specification bolt screw portions of the lag screw bolt 2 having a length of 5 cm protrude from both side surfaces of the pillar member 1.

FIG. 5 shows a T-shaped gusset plate 4, which has a rectangular width of 200 mm, a height of 790 mm, and a thickness of 14.
T-shaped head plate (end plate) 40 made of mm steel plate
1 is provided with through holes 403 having a diameter of 30 mm at four corners thereof.
0 mm, height 790 mm, thickness T 9 made of steel plate
The leg plate 402 is butted and welded by K-type welding. As shown, the T-leg plate 402 has
Along the circumference of a concentric double circle having a radius of 260 mm and a radius of 323 mm, 16 small holes 404 each having a diameter of 18 mm are formed at equal intervals on the inner and outer circumferences. 5A is a front view of the gusset plate 4, FIG. 4B is a side view of the gusset plate 4 seen from the T-shaped head plate 401 side, and FIG. 5C is a plan view of the same.

FIG. 6 shows the pillar member 1 and the beam member 3 described above.
Is a developed view of a column-beam joint structure in which the lag screw bolt 2 and the gusset plate 4 are joined together. In this example, the lag screw bolt 2 is arranged in two directions intersecting with the column member 1 respectively. The beam members 3 were joined to each other through the gusset plates 4 by arranging them in parallel and penetrating each other. That is, by inserting the through holes 403 of the gusset plate 4 into the end bolt screw portions 202 of the four lag screw bolts 2 screwed and fixed to the pillar member 1 and fastening them with the nut 6, the gusset plate 4 is fixed. The slit 301 of the beam member 3 is fitted into the T-shaped leg plate 401 of the gusset plate 4, and the small hole 404 of the gusset plate 4 and the corresponding through hole 302 of the beam member 3 with a diameter of 18 mm. The drift pins 5 are driven and fitted to fix them, and the joining is completed.

In this example, the lower surface of the protruding end portion of the lag screw bolt from the column member is covered with a concave fireproof cover (laminated material).

Strength Test Example Regarding the column-beam joint structure having the above structure, the beam height is 5
00 mm (test body 1), 650 mm (test body 2), 80
Three types of 0 mm (test body 3) column-beam cross-shaped joint test bodies were created, and as shown in FIG. 7, the column member was repeatedly subjected to lateral vibration (vibration in the lateral direction in the figure) under the following conditions. A strength test (Fig. 7) was performed. The lower end of the column member and the outer end of the beam member were both supported by pin hinges.

Test conditions Magnitude of left and right vibrations ...
After that, increase by √2 times and finally 245 mm to the left and right
Vibrated one by one.

The number of times the vibration is repeated ... 8 times The result is compared with the conventional joining method with large deformation, in which the gusset plate does not intrude into the side surface of the column of the T-shaped head plate 401 at first. It was found that the joint had very little deformation.

As for the damage condition, in the case of the test body 1 in which the beam member had a small height of 50 cm, the drift pin joint portion on the beam member side was destroyed, and the height of the beam member increased from 65 cm to 80 cm to the column. The lag screw bolt 2 was destroyed so that it could be pulled out. The proof stress at that time was significantly improved compared to the conventional joining method with large indentation deformation.

From the above results, it was proved that by using the above-mentioned joining method, it is possible to construct a column-beam joint which can be easily constructed at a construction site, has a small initial deformation, and is strong and tenacious. .

[0027]

According to the present invention, there is an effect that a beam can be prevented from being embedded in the side surface of a column, and a joint structure with little deformation and excellent strength can be provided.

Further, it is possible to rigidly join columns and beams having a large cross section by a very simple method, and it is also possible to rigidly join the girder direction and the straddle direction at the same time, which has not been suitable until now. This also makes it possible to obtain the effect that a two-way rigid frame structure exactly the same as that of a steel frame structure or a reinforced concrete structure can be realized with a wooden structure.

Furthermore, in the large-section laminated lumber, the structural material also plays the role of the final construction material, so the cost of internal finishing is reduced and a wide space with a large degree of freedom is secured in the building constructed by this joining method. It also has the effect of being able to do it.

Further, as compared with a joint structure in which deformed bars are inserted into columns and beams and hardened with an adhesive, there is no need to secure a curing period at the time of construction for bonding and control of temperature and humidity, and construction time is increased. There is also an effect that it can be significantly shortened.

[Brief description of drawings]

1A and 1B show a pillar member, FIG. 1A is a front view seen from a through hole direction of the pillar member 1, and FIG. 1B is a side view thereof.

FIG. 2 shows a lag screw bolt,
(A) is the whole figure, (b) is the same part enlarged view.

FIG. 3 shows a beam member, (a) is a front view of the beam member, (b) is a side view thereof, and (c) is a plan view thereof.

FIG. 4 is a view showing a state in which four lag screw bolts are screwed into a column member, and both ends of the lag screw bolt are projected to the side face of the column.

FIG. 5 shows a gusset plate, (a)
Is a front view of the gusset plate, (b) is a side view of the gusset plate seen from the T-shaped head plate side, and (c) is a plan view of the same.

FIG. 6 is a development view of a column-beam joint structure in which a column member and a beam member 3 are joined by a lag screw bolt and a gusset plate.

FIG. 7 is a diagram showing an outline of an apparatus for testing the strength of a column-beam joint structure.

[Explanation of symbols]

1 ... Pillar member, 2 ... Lag screw bolt, 3 ...
..Beam members, 4 ... Gusset plates, 5 ... Drift pins, 6 ... Nuts

Claims (4)

[Claims] 1. A lag screw bolt having a lag screw screw portion of a shaft portion and a bolt screw portion of an end portion, and a T-shaped plate made of a steel plate, wherein the T-shaped head plate is provided with the lag screw bolt. Column member of wood using a gusset plate in which a plurality of through holes for fastening nuts of bolts and bolts are provided and a plurality of small holes through which drift pins are fitted in a T-shaped leg plate. And a beam member are joined to each other, and a T member of the gusset plate is attached to an end portion of the beam member of the wood.
A slit into which the leg plate is fitted and a through-hole corresponding to the small hole of the T-leg plate are provided, and a plurality of the lag screw bolts are arranged in parallel to a wood pillar member and the ends thereof are arranged. The bolt screw portion of the portion is screwed in the horizontal direction so as to project to the outside, and the bolt screw portion projecting to the outside is passed through the through hole of the T-shaped head plate of the gusset plate, and tightened and fixed by tightening a nut. Further, the T-shaped leg plate of the gusset plate is fitted into the slit of the beam member, and shearing force is transmitted over the small holes of the T-shaped leg plate and the corresponding small through holes of the beam member. A timber pillar-beam joint structure using lag screw bolts, characterized by being fitted with drift pins. 2. The timber pillar-beam joint structure using a lag screw bolt according to claim 1, wherein the bolt screw portion of the lag screw bolt is provided at both ends or one end on one side. 3. A small hole in a T-shaped leg plate into which a drift pin fits and a large number of small through holes in a beam member corresponding to the small hole are either a single circle, a concentric double circle, or a concentric triple circle. The timber pillar-beam joint structure using a lag screw bolt according to claim 1 or 2, wherein the timber pillar-beam joint structure is provided at regular intervals. 4. The T-shaped leg plate has a vertical posture, the T-shaped head plate has a rectangular shape, and nuts are fixed by lug screw bolts at respective positions near at least four corners of the rectangular shape. A timber pillar-beam joint structure using the lag screw bolt according to any one of claims 1 to 3.