JP6993771B2 - Wooden rigid frame structure - Google Patents

Description

The present invention relates to a wooden rigid frame structure, and more specifically, not only for rigid joining of columns and beams in a wooden building, but also for the building to be distorted due to a large load due to a subsequent earthquake or the like, and for the tree to become thin. It also relates to a wooden rigid frame structure that can be repaired after the fact and that can be dismantled and reconstructed to facilitate removal and relocation.

In a wooden building, columns are erected on a foundation anchored to the foundation, and beams are laid to form columns and beams. By adding braces to this and by inserting wall panels in the two-by-four method, the deformation of the framework is prevented from becoming large. If this framework is made rigid, braces and wall panels will not be required, large openings for entrances and windows can be obtained, and many can be provided. That is, although it is a wooden building, a rigid structure equivalent to or close to that of a steel structure is realized.

However, since the framework is not made of steel, the rigidity of the joint is far below that of welding steel frames or fastening bolts. Nevertheless, efforts have been made to introduce rigid frame structures in wooden buildings as well, and a typical example is to interpose steel hardware in the joints and join them with bolts without spoiling the appearance of columns and beams. It is done. The hardware may be a steel gusset plate or similar bracket, but the entire hardware may be embedded in the beam, or it may be fixed with bolts or pins on either side of the beam. Partial exposure may be unavoidable.

For example, in Patent Document 1, a cross-shaped notch extending in the vertical direction by the back of the beam is formed in each of the lower end joint of the upper floor pillar and the upper end joint of the lower floor pillar, and the remainder is made into a dent. Is disclosed. Although the details are omitted, as shown in FIG. 13A, slits 43 are formed at the tips of the crosses 41 and the ends of the beams 42 that are combined with the notches and tenons, and the gusset plate 44 is embedded therein. A drift pin 45 is inserted through the mortise and tenon 45 to join the two.

In Patent Document 2, as shown in FIG. 13B, a bracket 47 which is U-shaped in a plan view and protrudes toward the beam is attached to the side joint of the pillar 46, and a slit provided at the end of the beam 48 is provided. The structure to be fitted to 49 is shown. This is also essentially the same as the gusset plate and drift pin coupling form.

Patent Document 3 has a form in which the entire joint fitting is exposed at the joint, and this is a beam-shaped joint plate 52 having a shape like an angled steel material 51 back to back, as shown in FIG. 13 (c). It is fixed to the end of the tree 53 or the pillar 54. That is, a metal joint structure 55 having a wing-shaped joint plate attached to three or four sides is arranged at the intersection position of the column and the beam, and the wing-shaped joint plate and the wing-shaped joint plate of the column or the wing-shaped joint plate of the beam are arranged. And are fixed via bolts.

Japanese Unexamined Patent Publication No. 6-185116 Jitsuto 3090665 Gazette JP-A-2005-264688

In any of the above examples, a bolt for joining or the like is inserted from the side surface of the beam, for example, into an insertion hole or a bracket receiving recess provided in the embedded gusset plate, but the hole or the recess is slightly larger than the bolt diameter. Therefore, even if the bolt is fastened with a nut, the initial backlash is left as in the case of the drift pin. It can be said that the point that the columns and beams or the beams are not directly integrated by bolts or the like through this kind of metal fittings is not perfect as a rigid joint structure.

By the way, when the beam is subjected to a downward load at the intermediate portion, the bending moment acting on the joint portion of the beam column causes tension in the upper layer portion of the beam and compression in the lower layer portion of the beam. As a result of the drift pin on the tension side exerting a force in the extending direction of the fiber of the beam, the beam must counter with the weakest split strength. In order to reduce the stress acting on the drift pin, it is also necessary to increase the length of the beam. Since the diameter of the pin is small, it is even more so if stress concentration of bearing pressure occurs.

In addition, even if multiple drift pins are used, initial backlash is unavoidable as described above, and due to aging and the like, tight fastening is not always maintained. Furthermore, one of the major drawbacks of gusset plates, which have a smaller cross-sectional performance than the cross-section of the beam, is that they cannot exert bending strength commensurate with the strength of the wood.

If the above-mentioned gusset plate or bracket is deformed when a large load is applied, the shaft assembly can hardly be modified. Therefore, even if the building is distorted due to a large load due to an earthquake, or even if the tree becomes thin, the loosening of the rigid joint cannot be eliminated after the fact, let alone the column-beam frame structure can be reused. There is no hope for dismantling.

The present invention has been made in view of the above problems, and an object thereof is to achieve rigid joint of a column-beam frame as a joint structure without initial backlash, and even if the frame is distorted due to an ex post facto phenomenon due to an earthquake or the like. It is an object of the present invention to provide a wooden rigid frame structure capable of eliminating loosening of joints and easily repairing deformation even if the joints change over time.

The present invention is applied to a wooden rigid frame structure in which columns and beams are rigidly joined in a wooden building. The feature is that, referring to FIG. 1, at least a pair of horizontal through holes 17 are formed vertically in both the existing columns 12A and the next wooden columns 12B at the sites where the columns and beams are rigidly joined. At the same time, the through hole 17 is loaded with a first metal coupler 4 having a first female screw 4A to which the outer peripheral screw 20A of the head portion of the lug screw 14 screwed into the existing beam 11A is engaged. A step portion 22 for reducing the cross-sectional dimension is formed in the beam arranged between the wooden pillars, and the wood end 11 m of the portion having a small cross-sectional dimension is on the side of the existing pillar 12A with the step surface 22a as a boundary, and the portion having a large cross-sectional dimension. The end 11n is formed on the side of the next pillar 12B. The beam outer concave recessed space 23 from the wood end 11 m having a small cross-sectional dimension to the stepped surface 22a has a length that allows a joining tool to be connected to the second female thread 4B provided on the anti-first female thread side of the first coupler 4 to be arranged. .. Another lalag screw 14 on the extension line of the through hole 17 is screwed into the existing column side in the next beam 11B so that the head 20 on which the outer peripheral screw 20A is engraved protrudes from the stepped surface 22a of the beam. Further, another lug screw 14 is screwed to the next pillar side in the next beam 11B so that the head 20 in which the outer peripheral screw 20A is engraved protrudes from the wood end 11n on the side facing the next pillar 12B. It has been entered. The connecting bolt 5 as a joining tool is engaged with the second female screw 4B, and the existing pillar 12A is supported in the vicinity of the through hole 17 by the nut 6 hooked on the connecting bolt 5. The connecting bolt 5 is engaged with a second metal coupler 7 as another joint by a first internal screw 7A. In the second coupler 7, a second internal screw 7B meshed with the head outer peripheral screw 20A of the lug screw 14 protruding from the stepped surface 22a is formed on the side of the anti-first internal screw. The second internal thread 7B and the first internal thread 7A are spirals in the same direction, but the thread pitch p _B of the second internal thread 7B is larger than the thread pitch p _A of the first internal thread 7A, and Rigid joining of columns and beams is achieved by a metal screw-type joining mechanism 2 including a first coupler 4, a connecting bolt 5, a nut 6 for bearing pressure, and a second coupler 7.

According to the present invention, the metal screw type joining mechanism for rigid joining of columns and beams includes a first coupler, a connecting bolt, a nut for bearing pressure, and a second coupler, and the two internal threads of the second coupler are in the same direction. However, since the thread pitch of the second internal thread is larger than the thread pitch of the first internal thread located on the connecting bolt side, the lug screw of the next beam can be used as an existing column by rotating the second coupler. It can be pulled in the direction and, as a result, the next beam can be rigidly joined to the existing column.

Since the lug screws that are screwed into the two beams that sandwich the existing column are tightly connected by the screw type joining mechanism, even if the beams are discontinuously arranged across the column, a strong bond is made, and by extension, the beam. The unity with the columns sandwiched between the columns is also significantly improved, and it is possible to make a wooden rigid frame structure in which rigid joining of columns and beams is achieved.

At both ends of the next beam placed between the existing pillar and the next pillar, a wood end is formed that is in close contact with the facing surface of the wooden pillar. By providing a part, it is made smaller than the end of the tree on the side of the next pillar. Since the beam outer concave recessed space from the end of the existing column to the stepped portion is long enough to allow the joining tool such as the second coupler to be placed, it is exposed from the existing column and the next beam in the screw type joining mechanism. The portion can be accommodated in the concave outer space of the beam.

Compared to the gusset plate mechanism, which is fixed in the axial direction of the beam from the side surface of the beam with a drift pin, etc., the joint is clearly free of initial backlash, and rigid joining of the column-beam framework is achieved. The beam. Since this screw-type joining mechanism can be rotated, even if the framework is distorted or deformed due to a large load, or if there is play due to aging, etc., if the second coupler is further tightened, rigid joining will occur. The state can be reproduced.

The main configuration of the screw type joining mechanism forming the wooden rigid frame structure of the present invention and the joining mechanism at the stage of advancing the second coupler toward the head outer peripheral screw are applied to the lower floor joint of the framework. Schematic diagram of the main part. The whole front view which the screw type joining mechanism is introduced into the column beam frame of a two-story house and completed. (A) is a front view of an example of a single beam, (b) is a perspective view of a joining state at a joint in a prismatic framework, and (c) is a perspective view showing how screw type joining mechanism groups intersect. (D) is a perspective view of the joint state at the joint in the framework of the round pillar, and (e) is a front view of an example in which the beam has a different shape. Front view of the state where the next column is tilted so as to create a gap δ between the next beam for the lower floor and the existing column. (A) is a schematic diagram with the connecting bolt facing the first coupler, (b) is a schematic diagram with the bearing plate, disc spring washer, and nut arranged, and (c) is the bearing plate strengthening the existing pillar. Schematic diagram of the state where the nut is tightened so as to press. Schematic diagram of the state where the second coupler is arranged between the connecting bolt and the head outer peripheral screw protruding from the stepped surface. Schematic diagram of a state in which the second coupler is deeply screwed to the connecting bolt until it abuts on the nut. Schematic diagram of a state in which the second coupler is rotated to reduce the amount of screwing between the first internal screw and the connecting bolt, and the second internal screw is initially screwed to the head outer peripheral screw protruding from the stepped surface. Schematic diagram of the case where the spacer of the next beam for the lower floor is removed by tilting the next pillar slightly away from the existing pillar with a jack in a horizontal posture. Schematic diagram of when the jack is extended to widen the space between the next pillar for the upper floor and the existing pillar and the spacer is removed. Top view of the joint in the form of crossed beams. Plan view A plan view of the joints of the beams arranged in a T shape. An example of a rigid joint structure disclosed in the prior art document.

Hereinafter, the wooden rigid frame structure according to the present invention will be described in detail with reference to the drawings showing the embodiments thereof. FIG. 1 shows the state of the column and beam at a certain stage in the construction of the column and beam framework 1, and the entire shape of the metal screw type joining mechanism 2 at that time is largely shown in the center. By this joining mechanism, the wooden rigid frame structure 3 shown in FIG. 2 in which columns and beams are rigidly joined in a wooden building is realized.

As shown in FIG. 1, the joining mechanism 2 includes a first coupler 4, a connecting bolt 5, a bearing nut 6, and a second coupler 7. In the illustrated example, the pressure plate 8 and the disc spring washer 9 are also included. Of these elements, the direct element that achieves rigid joining is the second coupler 7, which has two female threads aligned in the axial direction, similar to the first coupler 4. It should be noted that, as shown in the enlarged view shown in the lower left, in the second coupler 7, the first internal thread 7A and the second internal thread 7B forming the female thread are spirals in the same direction, but the second internal thread 7B The thread pitch p _B is made larger than the thread pitch p _A of the first internal thread 7A. By rotating the second coupler 7, the beam 11 can be brought closer to the column 12, and not only can both be rigidly joined, but also the beam 11 sandwiching the column 12 and the beam 11 can be rigidly joined.

Before concretely explaining those elements, the overall form in which the screw type joining mechanism 2 is introduced into the beam-column framework 1 will be described. The framework is as shown in FIG. 2, which is an example of a two-story house. In the framework 1, the beams 11 also shown in FIG. 3A are bridged over the columns 12 arranged as shown in FIG. The screw type joining mechanism 2 to be introduced is applied to each of the lug screws 14 described later, and as shown in FIG. 3 (b), there is a pair of left and right on the upper and lower sides in one cross section of the beam 11. Therefore, if the lag screw group 15 is drawn in the shape of a rod composed of four, it will be as shown in FIG. 3 (c). One group extends through a pillar 12 having a rectangular cross section, and the other groups provided as needed are arranged so as to intersect. In this example, group 15M is located in the internal region of group 15T. In the following description, since the framework is viewed from the front, only the upper and lower pairs of the four screw type joining mechanisms are shown.

The elements constituting the screw type joining mechanism 2 will be described in detail individually. The first coupler 4 is a tubular body as shown in FIG. 1, and a first female screw 4A and a second female screw 4B are formed in series. In this example, both female threads have the same direction spiral, the same diameter, and the same pitch. The coupler 4 is attached to an already firmly upright pillar 12A (hereinafter referred to as an existing pillar) shown on the right side of FIG. Horizontal through holes 17 are vertically bored in the upright existing column at a portion (joint) where the beam 11B (hereinafter referred to as the next beam) to be incorporated is to be rigidly joined. There is. The first coupler 4 is loaded into the through hole 17, but the size is slightly shorter than that of the through hole 17 in order to effectively exert the pressure supporting action described later.

As shown in FIG. 1, the first female screw 4A described above is formed so as to mesh with the head portion outer peripheral screw 20A of the lug screw 14A screwed into the existing beam 11A. The second female screw 4B is for screwing the connecting bolt 5 mentioned above. This first coupler 4 is already loaded in the existing pillar 12A as described in the construction method described later, and is to be erected in parallel with the existing pillar 12B (hereinafter referred to as the next pillar). Will be loaded at the stage of FIG. 4, which will be described later. Incidentally, the lug screw 14 is composed of a screw shaft, a janal, and a head screwed in the axial direction of the beam to which the reference numerals 18, 19, and 20 are given in FIG. 1. The outer peripheral screw 20A described above is formed on the head 20, and the screw of the lug screw 14 and the outer peripheral screw 20A of the head portion have the same diameter, and are, for example, machined from a round bar.

By the way, as shown in FIG. 3A, a step portion 22 for reducing the cross-sectional dimension is formed in the portion on the existing pillar side in the beam arranged between the wooden pillars. With the stepped surface 22a (see FIG. 1) as a boundary, the wood end 11m of the part having a small cross-sectional dimension is next to the existing pillar 12A, and the wood end 11n of the part where the beam size is the same (the part having a large cross-sectional dimension) is nextly installed. It will be formed on the side of the pillar 12B. The beam outer concave recessed space 23 from the wood end 11 m having a small cross-sectional dimension to the stepped surface 22a has a length at which a jointing tool described later to be connected to the second female screw 4B provided on the anti-first female screw side of the first coupler 4 can be arranged. Will be done. Needless to say, the portion having a small cross section is selected to have dimensions that exhibit the desired strength as a beam.

All of the lug screws 14 applied to the next beam 11B are on the extension line of the through hole 17 of the existing column 12A, and one is such that the head 20 on which the outer peripheral screw is engraved protrudes from the stepped surface 22a of the beam. It is screwed into the existing pillar side. The other is screwed into the next pillar side so that the head 20 on which the outer peripheral screw is engraved protrudes from the wood end 11n on the side facing the next pillar 12B.

The connecting bolt 5 as the above-mentioned joining tool is engaged with the second female screw 4B, and the existing pillar 12A is supported in the vicinity of the through hole 17 by the nut 6 hooked on the connecting bolt 5. The bearing plate 8 is applied to the existing pillar 12A in order to reduce the high surface pressure acting on the bearing portion as much as possible and to make the bearing pressure effective, and the nut 6 is prevented from loosening by sandwiching the disc spring washer 9 or the like. It is planned. Since the existing pillar 12A is slightly compressed by the pressing force of the bearing plate 8, the first coupler 4 has a through hole as described above so that the first coupler 4 does not get in the way during the bearing. It is a little shorter than 17. By the way, even if the bearing force is reduced, the next beam 11B can be attracted to the existing column 12A and the next beam 11B can be attracted to the existing beam 11A after the fact as described later, so that the existing column 12A can be attracted. The pinching pressure acting on the beam does not decrease unexpectedly.

A second metal coupler 7 as another joint is engaged with the connecting bolt 5 by a first internal screw 7A. In the second coupler 7, a second internal screw 7B meshed with the head outer peripheral screw 20A of the lug screw 14 protruding from the stepped surface 22a is formed on the anti-first female screw side, and the second internal screw 7B and the second internal screw 7B are formed. Although it is a spiral in the same direction as the first internal thread 7A, it has already been mentioned that the thread pitch p _B of the second internal thread 7B is larger than the thread pitch p _A of the first internal thread 7A.

Next, the procedure of how to build the column-beam framework 1 using the screw type joining mechanism 2 will be described. In addition, in the example of incorporating the next beam 11B _L for the lower floor and the next beam 11B _U for the upper floor between the existing column 12A and the next column 12B, the framework 1 as shown in FIG. 2 is to be completed. be.
(1) In order to arrange the next beam 11B _L at a predetermined position, the next column 12B is provided so as to create a gap δ between the lower floor next beam 11B _L and the existing column 12A as shown in FIG. Tilt. At that time, among the anchor bolts of the next pillar 12B, the anchor bolt 25 on the side of the existing pillar 12A is loosened, and the next pillar 12B is pulled by the lever block (registered trademark) 26 so as not to fall further. This δ may have a size that allows the connecting bolt 5 and the second coupler 7 as a joining tool to be arranged. At this time, it goes without saying that a gap larger than δ is generated between the next beam _11BU for the upper floor and the existing column 12A. As can be seen from FIGS. 5 (c) and 6, δ may be set to a dimension δ ₁ in which the second coupler 7 can be arranged with the connecting bolt 5 protruding and fixed from the through hole 17. When the connecting bolt 5 is longer than δ ₁ , as can be seen from FIG. 5A, the connecting bolt 5 may be set to the dimension δ ₂ which can be arranged to engage with the first coupler 4.
(2) In this state, the next beam _11BL for the lower floor is suspended as shown in FIG. 4, and the lug screw 14 is screwed into the side of the wood end 11n of the portion having a large cross-sectional dimension. Head outer peripheral screw 20A faces the through hole 17 _L for the lower floor. The next beam 11B _U for the upper floor is also placed in the joint for the upper floor, and the head outer peripheral screw 20A of the lug screw 14 screwed into the side of the wood end 11n where the beam size remains the same is installed on the upper floor. It faces the through hole 17 _U for the purpose.
(3) At this point, a drift pin (not shown) is struck at a predetermined location to prevent a large change in the posture of the next beam 11B on the side of the next column, and the first through holes 17 _L and 17 _U are used. The coupler 4 is inserted, and each first female screw 4A is engaged with the head outer peripheral screw 20A protruding from the next beam 11B until the screw bottom is reached. The existing column side of the next beam 11B is supported by jacks J ₁ and J ₂ as shown in the figure.
(4) The connecting bolt 5 shown in FIG. 5A faces the beam outer concave recessed space 23 formed by the stepped surface 22a of the next beam 11B, and the existing column side of the screw is placed on the existing column side of the first coupler 4. Engage with the second female screw 4B to the bottom of the screw. As shown in FIG. 5 (b), the bearing plate 8, the disc spring washer 9, and the nut 6 are arranged, and the nut 6 is tightened so that the bearing plate 8 strongly presses the existing column 12A as shown in FIG. 5 (c). The disc spring washer 9 prevents the nut 6 from loosening, and the next beam 11B and the existing column 12A are tightly fastened. In that state, as shown in FIG. 6, the second coupler 7 is arranged between the connecting bolt 5 and the head outer peripheral screw 20A protruding from the stepped surface 22a, and the second coupler 7 is the nut 6 as shown in FIG. Screw deeply until it comes into contact with. These operations are also performed at the upper floor joint.
(5) In this state, a plastic spacer 27 having a desired thickness t, for example, 4 mm, is pinned to the small cross-sectional dimensions of the next beams 11B _L and 11B _U not only for the lower floor but also for the upper floor. And attach it. The next pillar 12B is pulled up by the lever block (registered trademark) 26 (see FIG. 4), and the spacer 27 _L attached to the lower floor next beam 11B _L is brought into contact with the existing pillar 12A as shown in FIG. Incidentally, a gap larger than t is generated between the next beam 11B _U for the upper floor and the existing column 12A.
(6) The second coupler 7 is rotated to reduce the amount of screwing between the first internal screw 7A and the connecting bolt 5, and as shown in FIG. 8, the outer periphery of the head in which the second internal screw 7B protrudes from the stepped surface 22a. The initial screw state is set to the screw 20A, for example, about 1 pitch.
(7) Therefore, in FIG. 9 _, the next pillar 12B is slightly tilted by the jack J3 in the horizontal posture to remove the spacer 27 _L. The jack J ₃ is removed, and the second coupler 7 is advanced toward the head outer peripheral screw 20A as shown in FIG. The second internal thread 7B that engages with the head outer peripheral screw 20A and the first internal thread 7A that engages with the connecting bolt 5 are spirals in the same direction and have the same diameter, but the thread pitch _pB of the second internal thread 7B is the first internal thread 7A. Since the screw pitch p _A is larger than that of No. 2, if the second coupler 7 is rotated (difference in screw pitch x number of rotations), the lug screw head 20 and the connecting bolt 5 come closer to each other. The lug screw head is moved by the thickness of the spacer 27 _L , which achieves the amount of engagement in which each internal screw exerts a predetermined force and is removed. At this time, the second coupler 7 in the four screw type joining mechanisms 2 at the joint is rotated at almost the same time. Tighten the loosened anchor bolts 25 (see FIG. 9) among the anchor bolts of the next pillar 12B to make the next pillar 12B stand upright. The thickness t of the spacer 27 is assumed to correspond to (difference in screw pitch × rotation speed), and a predetermined engagement is achieved when the end 11 m abuts on the existing pillar 12A.
(8) Since the spacer 27 _U is left on the upper floor next beam 11 B _U , the next pillar 12 B _U is in a stretched state at the upper floor joint even though it is in an upright state. Therefore, the jack J ₄ shown in FIG. 9 is extended to widen the space between the next pillar 12B and the existing pillar 12A, and the spacer 27 _U is removed. After that, the next beam _11BU for the upper floor is attached by the same operation as the operation at the joint for the lower floor (see FIG. 10). When the second coupler 7 on all floors is fully tightened, the framework 1 for the first and second floors is completed as shown in FIG. Further, when constructing the next framework 1, the columns may be installed one after another, and the beams described above may be regarded as existing columns and the beams may be incorporated one after another in the same manner. For example, as shown in FIGS. 11 and 3 (c), the screw type joining mechanism may be crossed to form a crossed form 31 of the beams, or a form 32 having a T-shaped plan view as shown in FIG. 12 may be formed. .. Incidentally, when the framework is not added, the retaining metal fitting 33 may be attached to the first coupler. If the beam outer concave space 23 is covered with a wooden cover 34 (see FIG. 10) or the like, the appearance of the column-beam joint can be easily adjusted.

The existing pillar 12A and the next pillar 12B are shown with a rectangular cross section, but a round pillar 35 may be used as shown in FIG. 3D. Further, since it is only necessary to form a wood end having a small cross-sectional dimension on the next beam 11B with the stepped surface as a boundary, if it is drawn extremely, even the deformed beam 36 as shown in FIG. 3 (e) has a predetermined strength. If you have, you can do it. The end of the tree 11 m has a shape obtained by forming the outer concave space of the beam at two places above and below the beam, but it has a shape obtained by forming two places on the left and right, or is formed at four places around the beam. It can also be in the form obtained by this.

By the way, in the above example, the second internal thread 7B and the first internal thread 7A of the second coupler 7 are assumed to have the same diameter, but they are spiral in the same direction and the screw pitch is larger than that of the first internal thread 7A. If the internal screw is 7B, the diameter does not have to be the same. However, if the diameters are the same, the structure and shape of the coupler itself will be simplified as much as possible, and it will be easier to manufacture, which is convenient.

Further, in the above example, the thread pitch of the second internal thread 7B is larger than the thread pitch of the first internal thread 7A, and the thread pitch of the second female thread 4B of the first coupler 4 is equal to the thread pitch of the first female thread 4A. It is shown on the premise that the screw pitch of the head outer peripheral screw 20A of the lug screw 14 in the existing beam 11A is smaller than the screw pitch of the outer peripheral screw 20A of the lug screw head in the next beam 11B. Instead, the thread pitch p _B of the second internal thread 7B of the second coupler 7 is larger than the thread pitch p _A of the first internal thread 7A, but the thread pitch of the first female thread 4A of the first coupler 4 is the second female thread. It is also possible to make the screw pitch of the head outer peripheral screw of the lug screw 14 in the existing beam 11A equal to the screw pitch of the outer peripheral screw of the lug screw head in the next beam 11B, which is larger than the screw pitch of 4B. In that case, the diameter of the head outer peripheral screw in the lug screw is made the same.

By the way, normally, as shown in FIG. 3 (c), there are a total of four screw type joining mechanisms 2, one pair on each side in the upper and lower parts of the cross section of the beam, but depending on the size, the upper and lower parts in one cross section of the beam. There may be a total of two pairs. Further, if the column base of not only the existing column but also the next column is set as the rigid column base structure proposed by the present inventor in Japanese Patent Application No. 2016-160419, the details thereof will be omitted here, but the column-beam frame Can be left as an unparalleled rigidly joined wooden rigid frame structure.

As can be seen from the above description, according to the present invention, the lug screws screwed into the two beams sandwiching the existing column are tightened by the screw type joining mechanism, so that the beams are arranged discontinuously. Strong joints are made, and by extension, the integrity with the columns sandwiched between the beams is significantly improved, and rigid joints between the columns and beams are achieved.

The threaded joining mechanism, which is arranged in the axial direction of the beam, is clearly a joint without initial backlash compared to the mechanism such as the gusset plate in the prior art, which is fixed from the side surface of the beam with a drift pin. There is no way to compare the improvement of the rigid joint of the pair. Since this screw-type joining mechanism is a rotational operation, even if the framework is distorted or deformed due to a large load, or if the wood becomes thin and loose due to aging, the second coupler can be further added. If tightened, the rigid joint state can be reproduced. Conversely, since the joint can be released by operating the second coupler, it is extremely easy to disassemble the framework, the amount of waste material generated can be reduced as much as possible, and further, it can be reconstructed. As a result, it will be possible to make it a mobile residence or a temporary housing that can be dismantled and stored.

1 ... Beam beam frame, 2 ... Screw type joining mechanism, 3 ... Wooden ramen structure, 4 ... First coupler, 4A ... First female screw, 4B ... Second female screw, 5 ... Connecting bolt, 6 ... Nut for bearing pressure , 7 ... 2nd coupler, 7A ... 1st internal thread, 7B ... 2nd internal thread, 11 ... beam, 11A ... existing beam, 11B, 11B _L , 11B _U ... next installation beam, 11m ... Kiguchi, 11n ... The part where the beam size remains the same (the part with a large cross-sectional size) Kiguchi, 12 ... Pillar, 12A ... Existing pillar, 12B ... Next pillar, 14, 14A ... Lag screw, 17, 17 _L , 17 _U ... Through hole, 20A ... Head outer peripheral screw, 22 ... Stepped portion, 22a ... Stepped surface, 23 ... Beam outer concave recessed space, 25 ... Anchor bolt, 27, 27 _L , 27 _U ... Spacer, p _A ... First inside Thread pitch of screw, p _B ... Thread pitch of second internal thread.

Claims (1)

In a wooden rigid frame structure with rigid joints of columns and beams in a wooden building
At least a pair of horizontal through holes were formed in the upper and lower parts of the wooden columns of both the existing column and the next column at the site where the columns and beams are rigidly joined, and the through holes were screwed into the existing beams. A first metal coupler with a first female thread into which the outer peripheral screw of the head of the lug screw is engaged is loaded.
A step portion for reducing the cross-sectional dimension is formed on the beam arranged between the wooden pillars, and the end of the portion having a small cross-sectional dimension is on the side of the existing pillar with the step portion as a boundary, and the end of the portion having a large cross-sectional dimension is formed. Formed on the side of the next pillar
The beam outer recessed space from the end of the wood with a small cross-sectional dimension to the stepped surface has a length that allows the joining tool connected to the second female screw provided on the anti-first female screw side of the first coupler to be placed.
Another lug screw on the extension line of the through hole is screwed into the existing column side in the next beam so as to project the head in which the outer peripheral screw is engraved from the stepped surface of the beam, and further. The lug screw is screwed into the next pillar side in the next beam so that the head in which the outer peripheral screw is engraved protrudes from the wood end on the side facing the next pillar.
The connecting bolt as the joining tool is engaged with the second female screw, and the existing column is supported in the vicinity of the through hole by the nut hooked on the connecting bolt.
A second metal coupler as another joint is engaged with the connecting bolt by a first internal screw.
In the second coupler, a second internal screw meshed with the head outer peripheral screw of the lug screw protruding from the stepped surface is formed on the anti-first internal screw side.
The second internal thread and the first internal thread are spirals in the same direction, but the thread pitch of the second internal thread is made larger than that of the first internal thread.
A wooden rigid frame structure characterized in that rigid joining of columns and beams is achieved by a metal screw type joining mechanism including the first coupler, a connecting bolt, a nut for bearing pressure, and a second coupler described above.

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