JP7068917B2 - Connection structure of seismic metal fittings for wooden buildings - Google Patents

Description

The present invention relates to seismic metal fittings used in wooden buildings, and particularly relates to seismic metal fittings used by interposing a joint portion between a pillar and a horizontal member such as a foundation or a beam.

Various proposals have been made so far for reinforcing joints between columns of wooden buildings and horizontal members such as foundations and beams, but typical ones use joint fittings as shown in Patent Document 1. It is rigidly joined by tightening bolts and nuts.

JP 2001-140352

However, if rigidly joined, the large moment generated during an earthquake cannot be absorbed, and the wooden building may be damaged.
The present invention has been made by paying attention to the above-mentioned conventional problems, and is a novel and useful seismic resistance that can absorb moments at the time of an earthquake and effectively prevent damage to joints while ensuring rigidity. Its purpose is to provide metal fittings.

The present invention has been made to solve the above problems, and the invention of claim 1 is a seismic metal fitting for a wooden building that joins between columns and horizontal members such as foundations and beams in a wooden building. A pair of facing side surfaces are opened as work openings, and a box-shaped metal fitting body having an insertion hole formed on the lower surface and a free fitting hole are formed on the shaft core, and the free fitting hole communicates coaxially with the insertion hole. In this state, the metal fitting body is provided with a buckling aid arranged inside the metal fitting body, and the metal fitting body is one of the pair of working openings between the pillar and a cross member such as a foundation or a beam. The work opening is installed so as to face the side surface of the pillar, and the shaft that penetrates the insertion hole from the lower foundation or the like and protrudes into the inside of the metal fitting body is a free fitting hole of the buckling aid. A wooden building in which the tightening state is released when the metal fitting body is connected to the lower foundation or the like and the buckling aid is buckled by receiving an external force in the vertical direction. In the connecting structure of the seismic metal fittings for physical objects, the connecting portion where the vertical cross section is bent into a "U" shape and the pin insertion hole is formed on the closed surface is welded to the metal fitting body on the upper side of the metal fitting body. A bolt protruding from the metal fitting body side to the inner surface of the connecting portion is screwed and tightened to a nut welded to the inner surface of the connecting portion, and is attached to a corner of a pillar or the like. A pin is inserted into the pin insertion hole while holding the portion, and a pair of "U" -shaped facing surfaces are inserted into a groove formed in a pillar or the like, or the same as the closed surface. It is a connecting structure characterized in that a pin is inserted through a formed pin insertion hole and connected .

By using the seismic metal fittings of the present invention, it is possible to effectively prevent damage to the joint portion by absorbing moments during an earthquake while ensuring the rigidity normally required.

It is a front view which shows the state which the seismic metal fittings which concerns on 1st Embodiment of this invention are installed in a wooden building. FIG. 1 is a perspective view of a portion showing a state in which the seismic metal fittings are installed on a concrete foundation. It is an enlarged perspective view of FIG. It is an exploded perspective view of the seismic metal fitting of FIG. It is explanatory drawing of the behavior in the normal state and the occurrence of an earthquake in the installation state of FIG. FIG. 5 is an explanatory diagram of a deformed state of the seismic metal fittings at the time of normal operation and at the time of occurrence of an earthquake, corresponding to FIG. Another example of the notch portion of the pillar of FIG. 1 is shown. Another example of the notch portion of the pillar of FIG. 1 is shown. Another example of the notch portion of the pillar of FIG. 1 is shown. A lug screw of another example of the lag screw of FIG. 2 is shown. An example in which a bolt is used instead of the lug screw in FIG. 2 is shown. The metal fitting body which concerns on the 2nd Embodiment of this invention is shown. The metal fitting main body which concerns on the 3rd Embodiment of this invention is shown. The seismic metal fitting according to the 4th Embodiment of this invention is shown. Another use example of FIG. 14 is shown. The seismic metal fitting according to the 5th Embodiment of this invention is shown.

The seismic metal fitting 1 according to the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a part of a wooden building, and the skeleton is composed of a concrete foundation A, a foundation B, a pillar C, and a beam D in combination. As shown in detail in FIGS. 2 and 3, the base B is provided with a plurality of gaps B1 in a rectangular block shape. Further, the pillar C is formed with notches C1 in a square block shape on both the left and right sides of the upper and lower surfaces thereof. The missing portion B1 and the notched portion C1 penetrate in the front and back directions. That is the place where the seismic metal fitting 1 is installed.

As shown in detail in FIG. 4, the seismic metal fitting 1 includes a metal fitting body 3.
The metal fitting body 3 is box-shaped and has a slightly vertically long rectangular parallelepiped shape. It is composed of a bottom wall 5, a top wall 7, and a pair of facing side walls 9 and 9, and the remaining pair of facing side surfaces are fully open. Then, the openings are 11 and 11. The openings 11 and 11 are for work described later. The bottom wall 5 and the top wall 7 forming the upper and lower surfaces are square, and the bottom wall 5 is formed with a round insertion hole 13 in the center. Further, in the top wall 7, a round insertion hole 15 is formed in the middle of the center and the four edges. The four marginal insertion holes 15 are located diagonally. The inside of the metal fitting body 3 is hollow.

Further, a buckling orthotic device 17 is provided as a separate body from the metal fitting body 3.
The buckling orthotic device 17 has a cylindrical shape as a whole, and a free fitting hole 21 (see FIG. 6A) is formed in the axial direction of the cylindrical inner cylinder 19. The outer cylinders 23 and 23 coaxially surround the upper end side and the lower end side of the inner cylinder 19 to form a double cylinder structure, and a gap 25 is formed between them. The upper outer cylinder 23 has a shorter cylinder length than the lower outer cylinder 23, but has the same configuration other than that. The inner cylinder 19 and the outer cylinder 23 are connected via a perforated disk-shaped connecting flange 27, and the connecting hole 29 has the same shape as the loose fitting hole 21 described above, and the hole edge and the hole edge are vertically connected to each other. ..
The inner cylinder 19 is exposed to the outside between the upper and lower outer cylinders 23 and 23, and this portion is a buckling possible portion 31.

Whether the metal fitting body 3 is installed in the missing portion B1 of the base B or in the notch portion C1 of the pillar C, the pair of openings 11 and 11 of the metal fitting body 3 face the front side and the back side, respectively. There is.
The concrete foundation A, the foundation B, the pillar C, and the beam D are almost flush with each other on the front, back, and side surfaces, and a step portion X is formed between the concrete foundation A, the base B, the pillar C, and the side surface side. The edge is receding inward. Finally, decorative plates B2 and C2 having the same surface as the base B and the pillar C are fitted into the step portion X to hide the seismic metal fitting 1. In addition, in FIG. 2, for convenience of visual recognition, only the decorative plate C2 to be fitted into the notch portion C1 at the bottom is drawn.

When the lower side is a concrete foundation A, the male screw portion 33 (a) of the planted anchor bolt 33 protrudes upward, and this portion is inserted into the insertion hole 13 of the bottom wall 5 of the metal fitting body 3. The metal fitting body 3 is installed in a state where it is inserted and protrudes into the hollow interior. Then, inside the hollow of the metal fitting body 3, the male screw portion 33 (a) is made to penetrate the free fitting hole 21 and the connecting hole 29 of the buckling orthotic device 17, and further, a portion protruding from the upper surface of the connecting flange 27 is formed. After passing it through the washer 35, it is tightened by screwing the nut 37.
As a result, the metal fitting body 3 and the buckling aid 17 are connected to the lower concrete foundation A.

Further, a lag screw 41 is embedded in the pillar C on the upper side in advance. A female screw portion 43 having a hexagonal outer shape is provided at one end in the axial direction of the lug screw 41. The lower surface of the female threaded portion 43 is substantially flush with the lower surface of the pillar C. The bolt 45 is passed through the washer 47 from the hollow inside of the metal fitting body 3, then inserted into the insertion hole 15 of the top wall 7 to protrude upward from the metal fitting body 3, and is screwed to the female screw portion 43 described above. Tighten.
The two lug screws 41 and 41 are tightened through a total of two insertion holes 15 and 15 near the central portion and the corner of the pillar C.

As described above, the seismic metal fittings 1 are interposed at the joints between the concrete foundation A and the pillar C on both the left and right sides of the pillar C, and are connected to the lower concrete foundation A and the upper pillar C, respectively.
As shown in FIG. 2, the seismic metal fitting 1 is similarly installed between the pillar C and the beam D. However, although the lug screw 41 is used as the shaft protruding from the pillar C side inside the hollow of the metal fitting body 3, a long lug screw 49 is used as the shaft protruding from the beam D side. The lug screw 49 is provided with female screw portions 51 at both ends in the axial direction. The lug screw 49 penetrates to the upper and lower surfaces of the beam D, and is also used for connecting the metal fitting bodies 3 and 3 arranged above and below.
Two lug screws 41 are used for the connection with the column C side, and one lug screw 49 is used for the connection with the beam D side.

When the lower side of the bottom wall 5 inside the hollow of the metal fitting body 3 becomes the pillar C, the lug screw 41 is passed through the loose fitting hole 21 and the connecting hole 29 of the buckling orthotic device 17 from the upper surface of the connecting flange 27. After passing the protruding portion through the washer 47, the bolt 45 is screwed to the female thread portion 43 to tighten the bolt 45. When the lower side becomes the beam D, the lug screw 49 is similarly tightened.
On the upper surface of the beam D at the uppermost position, the bolt 55 is screwed to the female thread portion 51 of the lug screw 49 via the washer 53 and tightened.

The metal fitting body 3 can be used by turning it upside down, and when it is turned upside down, the bottom wall 5 becomes a top wall and the top wall 7 becomes a bottom wall. By using it in this way, the positions of the bolt insertion holes 13 and 15 can be changed, so it is only necessary to prepare one type of metal fitting body 3. As shown in FIG. 2, when the beam D is on the upper side, it is used by inverting it.

The base B is connected to the upper pillar C by a lug screw 41 on the metal fitting body 3 side, but in the meantime, the lower surface of the base B is countersunk, from which the screw 57 and the washer 59 are inserted. It is reinforced by screwing it to the pillar C through it.
Since the base B is laterally divided by providing the missing portion B1, as shown in FIG. 1, a long anchor bolt 61 is planted in advance between the columns C and C before the concrete is placed. After passing it through the washer 35, it is tightened by screwing the nut 37. As a result, the divided portion of the foundation B is also firmly fixed to the concrete foundation A.

The frame of the wooden building is reinforced as described above, and the rigidity required in normal times is sufficiently secured.
As shown in FIG. 5 (a), normally, the concrete foundation A and the column C are rigidly joined via the buckling aid 17, but when an earthquake occurs, it is shown in FIG. 5 (b). As such, the pillar C is pulled upward. At this time, since the buckling possible portion 31 of the buckling aid 17 buckles and shrinks, the tightened state with the concrete foundation A side, that is, the rigid joint state is released, and the metal fitting body 3 rises together with the pillar C. The concrete foundation A side remains in the same position. Since there is a gap between the free fitting hole 21 and the connecting hole 29 of the buckling orthotic device 17 and the anchor bolt 33, the above-mentioned lifting allows rotation within the gap range as shown by the alternate long and short dash line. .. Therefore, it is possible to absorb the moment generated by the earthquake and avoid damage to the joint portion. 6 (a) and 6 (b) show the state of the buckling orthotic device 17 in FIGS. 5 (a) and 5 (b).

The above-mentioned effect is expected between the column C and the beam D, and similarly, damage to the joint portion can be avoided.
After the earthquake has subsided, the buckling aids 17 can be taken out and replaced with new ones using the working openings 11 and 11. Since the buckling orthotic device 17 can be manufactured at low cost, the burden of repair can be reduced. This replacement ensures the required rigidity again.

FIG. 7 shows another notch portion C1 (a) of the notch portion C1 of the pillar C of FIG.
The notch C1 (a) is formed at a corner of the pillar C, does not penetrate in the front and back directions, and is left as a thin wall. The metal fitting body 3 (a) is formed on the thin wall. It is designed to be inserted from the left side between.
With this configuration, it is sufficient to fit only one side of the decorative plate C2. In this metal fitting body 3 (a), unlike the metal fitting body 3 shown in FIG. 4, only two insertion holes 15 are formed, but only a maximum of two lug screws 41 are used to ensure the required rigidity. It is conceivable to use such a metal fitting body 3 (a) in a place where it is sufficient to connect them.

FIG. 8 shows another notch portion C1 (b) of the notch portion C1 of the pillar C of FIG.
The cutout portion C1 (b) penetrates the middle of the pillar C in the front and back directions, and the metal fitting body 3 (a) shown in FIG. 7 is inserted between them from the front or back direction.
In places where the fire protection function is emphasized, the pillar C is thick, but in that case, a notch portion C1 (b) is formed in the middle, and thick decorative plates C2 (a) and C2 ( The a) can be fitted on the front surface and the back surface, respectively, to ensure the fire protection function.

FIG. 9 shows another notch portion C1 (c) of the notch portion C1 of the pillar C of FIG.
The notch portions C1 (c) are formed at three locations by penetrating the middle and left and right sides of the pillar C in the front and back directions, and the metal fitting body 3 (a) shown in FIG. 7 is formed at the three locations. It is designed to be plugged in. Then, the decorative plates C2 and C2 are fitted on the front surface and the back surface, respectively, to hide them.
With this configuration, the three seismic metal fittings 1, 1 and 1 cooperate to support between one pillar C and the beam D, and the seismic effect is enhanced.

FIG. 10 shows an example of connecting using another lug screw instead of the lug screw 49 of FIG.
As shown in FIG. 10A, two lug screws 63 and 69 replace one lug screw 49.
As shown in FIG. 10B, the lug screw 63 is provided with a female threaded portion 65 on one end side in the axial direction and a female threaded connecting portion 67 on the other end side. Further, the lug screw 69 has the same diameter as the lug screw 63, and is provided with a female screw portion 71 on one end side in the axial direction and a male screw-shaped connecting portion 73 on the other end side.
The male screw-shaped connection portion 73 of the lug screw 69 is screwed to the female screw-shaped connection portion 67 of the lug screw 63 and integrated into a shaft shape, and has the same shaft length as the lug screw 49. In this way, a short lug screw may be connected and lengthened to be used for connecting the seismic metal fitting 1.

FIG. 11 shows an example in which a bolt 75 is used instead of the lug screw 49 of FIG.
The bolt 75 is projected into the hollow inside of the metal fitting body 3, and on the buckling aid 17 side, like the anchor bolt 33, it is passed through the washer 35 and then tightened by screwing the nut 37. On the other side as well, after passing it through the washer 35, it is tightened by screwing the nut 37.
A stronger tightening force can be obtained by using a lug screw, but depending on the thickness of the beam D, bolting may be sufficient.

FIG. 12 shows another metal fitting body 3 (b) according to the second embodiment.
In the metal fitting body 3 (b), as shown in FIG. 12 (a), horizontally long rectangular reinforcing plates 77, 77 are fitted from above and below into the opening 11 of the metal fitting body 3 shown in FIG. 4 and narrowed. .. A pair of reinforcing plates 77, 77 are fitted in each of the pair of openings 11 and 11, respectively, and are connected to the column C and the beam D in the state shown in FIG. 12 (b).

FIG. 13 shows another metal fitting body 3 (c) according to the third embodiment.
In this metal fitting body 3 (c), as shown in FIG. 13 (a), one side wall 9 of the metal fitting body 3 shown in FIG. 4 is slightly closer inward, and along a pair of edges appearing accordingly. A pair of reinforcing plates 79 and 79 are fitted between the bottom wall 5 and the top wall 7, respectively. Therefore, it is connected to the pillar C and the concrete foundation A in the state shown in FIG. 13 (b).
As shown in FIGS. 12 and 13, it is possible to reinforce the metal fitting body 3 by adding an appropriate reinforcing portion while maintaining the outer shape of the box.

FIG. 14 shows a seismic metal fitting 81 according to a fourth embodiment of the present invention.
A metal fitting body 3 (d) similar to the metal fitting body 3 shown in FIG. 4 is provided, but an insertion hole 15 is not formed in the top wall 7, and a connecting portion 83 is attached by welding instead. ..
As shown in FIG. 14 (a), the connecting portion 83 has a vertical cross section bent into a “U” shape, and a plurality of pin insertion holes 87, 87, ... It is formed at intervals of. The pin insertion hole 87 has a tapered shape, and the inner surface side is reduced in diameter. Further, the pair of facing walls 89, 89 extend in parallel with each other. The connecting portion 83 stands up along the three edge portions of the top wall 7 of the metal fitting body 3 (d).
On the other hand, on the pillar C side, a pair of grooves C3 and C3 are formed on the notch portion C1 for fitting the connecting portion 83.

The metal fitting body 3 (d) side is inserted into the notch portion C1, and the pair of facing walls 89 and 89 on the connecting portion 83 side are inserted into the pair of grooves C3 and C3, respectively. In the holding state, the drift pin 91 is pushed into the pin insertion hole 87 to be connected.
Then, the decorative plate C2 (b) is fitted to hide the closing wall 85 of the connecting portion 83 and the opening 11 of the metal fitting body 3 (d). FIG. 14B shows the cross-sectional state. The head of the drift pin 91 is embedded in the tapered pin insertion hole 87 and does not protrude outward.
As shown in FIG. 15, it is also possible to install the seismic metal fittings 81 on both the top and bottom of the beam D.

FIG. 16 shows a seismic fitting 93 according to a fifth embodiment of the present invention.
The seismic metal fitting 93 has the same configuration as the seismic metal fitting 81 of FIG. 14, but as shown in FIG. 16A, the connecting portion 95 also has a pin insertion hole 87 in the pair of facing walls 89 and 89. , 87, ... are different in that they are formed.
A screw 97 is screwed in from the pin insertion hole 87 on the closing wall 85 side, and a drift pin 91 is pushed in from the pin insertion hole 87 on the facing wall 89 side to connect them. The pin insertion holes 87, 87, ... On the 89 side are arranged. Further, it is also possible to select and use an appropriate place without using all the pin insertion holes 87, 87, ... On the facing wall 89 side.
When this seismic metal fitting 93 is used, the pair of facing walls 89 and 89 sides are also hidden by fitting the decorative plate C2 (b).

The metal fitting body 3 (d) and the connecting portion 95 are integrated by welding, but are reinforced by using a nut 99 fixed by welding to the inner surface of the closing wall 85 of the connecting portion 95. A bolt insertion hole 101 is formed at the edge of the top wall 7, and a bolt 103 is inserted through a washer 105 from the hollow inside of the metal fitting body 3 (d) and screwed to a welded nut 99. There is. Since the insertion position of the bolt 103 is shifted inward from the inner surface of the closed wall 85 because the washer 105 is interposed on the metal fitting body 3 (d) side, the welded portion 85 (a) is slightly bent and the bolt 103 is inserted. It is closer to the nut 99 side that is screwed into.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the invention may be changed even if there is a design change within a range not deviating from the gist of the present invention. included.
For example, instead of one lug screw 41, two lug screws may be connected in a shaft shape and lengthened. Specifically, a male screw-shaped connection portion is formed on the connecting side of one lug screw, and a female screw-shaped connecting portion is formed on the connecting side of the other lug screw, and the lug screw is screwed and connected. On the opposite side of the other lug screw, a female screw portion 43 is formed similarly to the lug screw 41, and the bolt 45 is passed through the washer 47 from the hollow inside of the metal fitting body 3 and then the top wall 7 is inserted. It is inserted into the hole 15 and protrudes upward from the metal fitting body 3, and is tightened by screwing to the female screw portion 43 described above.
Further, it is also possible to form a male screw portion on the opposite side of the other lug screw in the same manner as the male screw portion 33 (a) of the anchor bolt 33. In that case, the male screw portion is inserted into the insertion hole 15 of the top wall 7 of the metal fitting body 3 so as to protrude downward into the hollow, and is passed through the washer 35, and then the nut 37 is screwed. Tighten.

The present invention has potential in the wood building material manufacturing industry and the construction industry.

1 ... Seismic metal fittings 3, 3 (a), 3 (b), 3 (c), 3 (d) ... Metal fittings body 5 ... Bottom wall 7 ... Top wall 9 ... Side wall 11 ... Openings 13, 15 ... Insertion holes 17 ... Bending aid 19 ... Inner cylinder 21 ... Free fitting hole 23 ... Outer cylinder 25 ... Gap 27 ... Connecting flange 29 ... Connecting hole 31 ... Swivelable part 33 ... Anchor bolt 33 (a) ... Male threaded part of anchor bolt 35 ... Seat 37 ... Nut 41 ... Lag screw 43 ... Lag screw female screw 45 ... Bolt 47 ... Seat 49 ... Lag screw 51 ... Lag crew female screw 53 ... Seat 55 ... Bolt 57 ... Screw 59 ... Seat 61 ... Anchor bolt 63 … Lag screw 65… Lag screw female thread 67… Lag screw female thread connection 69… Lag screw 71… Lag screw female thread 73… Lag screw male thread connection 75… Bolt 77… Reinforcing plate 79… Reinforcing plate 81 ... Seismic metal fittings 83 ... Connecting part 85 ... Closing wall 85 (a) ... Bending part of closed wall 87 ... Pin insertion hole 89 ... Opposing wall 91 ... Drift pin 93 ... Seismic metal fittings 95 ... Connecting part 97 ... Screw 99 ... Nut 101 ... Bolt insertion hole 103 ... Bolt 105 ... Seat metal A ... Concrete foundation B ... Base B1 ... Missing part B2 ... Decorative plate C ... Pillar C1 ... Notch part C2, C2 (a), C2 (b) ... Decorative plate C3 ... Groove H ... Liang

Claims (1)

In a seismic metal fitting for a wooden building that joins between a pillar and a horizontal material such as a foundation or a beam in a wooden building.
A pair of facing side surfaces is opened as a work opening, and a box-shaped metal fitting body having an insertion hole formed on the lower surface, and a box-shaped metal fitting body.
A buckling orthotic device is provided inside the metal fitting body in a state where a free fitting hole is formed in the shaft core and the free fitting hole communicates coaxially with the insertion hole.
The metal fitting body is installed between the pillar and a horizontal member such as a foundation or a beam , with one of the pair of working openings facing the side surface of the pillar, and the lower foundation or the like. A shaft that penetrates the insertion hole and protrudes into the metal fitting body is passed through the free fitting hole of the buckling orthotic device and then tightened, so that the metal fitting body is connected to the lower foundation or the like. Being done
In the connecting structure of the seismic metal fittings for wooden buildings, the tightening state is released when the buckling aid is buckled by receiving an external force in the vertical direction.
The vertical cross section is bent into a "U" shape, and the connecting portion having the pin insertion hole formed on the closing surface is integrated with the metal fitting body by welding on the upper side of the metal fitting body, and the connecting portion is formed. A bolt protruding from the metal fitting body side to the inner surface of the connecting portion is screwed and tightened to a nut welded to the inner surface of the portion, and the pin is attached while holding a corner portion such as a pillar. A pin is inserted into the insertion hole, and a pair of "U" -shaped facing surfaces are inserted into a groove formed in a pillar or the like, or a pin is inserted into a pin insertion hole formed in the same manner as the closed surface. A connected structure characterized by being inserted and connected.

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