JP2011094422A - Joining method for preventing wood splitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in the prior art wherein adhesive strength is determined by the number, length and thickness of dowel holes and wood dowels, and the number of dowel holes and wood dowels has to be increased or the cross section of wood has to be enlarged to improve bonding yield strength, which increases cost and causes splitting from a connector part at the ends of a column and a beam due to external force being applied. <P>SOLUTION: A method for joining a vertical member to a horizontal member, a vertical member to a vertical member, a horizontal member to a horizontal member and further the vertical member or horizontal member to a diagonal member of a sill, a column 1, a beam 2, etc. which are structural members includes boring a hole for inserting a connector 3 in the butt end of the structural member, and bonding the connector 3 to the hole through an adhesive 5 to integrate the connector 3 with wood. Further, a joining method preventing wood splitting includes embedding a ring 9 in the wood end 8 on the projecting side of a part of the connector 3 to cover a part of the outer periphery of the connector 3, and carrying out joining to the connector 3 with a connecting metal fitting 6 or the like. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention improves the bonding efficiency of adhesive bonding by using wood, connectors and connecting metal fittings when joining wood, that is, columns of vertical members in a wooden building, and bases, beams, and girders of cross members, The present invention relates to a joining method for preventing splitting of wood.

Conventionally, wood and connectors are generally bonded by a method in which a connector is previously set in a hole in wood and an adhesive is injected with a gun or the like. In this method, a hole is formed in the inlet and outlet of the adhesive, and the adhesive is filled, but sealing is performed to prevent the adhesive from leaking out.
Further, dowel holes communicating in an oblique direction across the base and the pillar are formed in the joint surfaces of the joint portion between the base and the pillar as wood, and the wood dowel is inserted into the dowel hole. A wooden dowel may be inserted into the dowel hole together with the adhesive. According to such a coupling structure, a joint between a wooden building column and a lower horizontal member such as a base, a beam or a girder, or an upper horizontal member such as a beam or a girder, that is, a column base or a column head. There exists a method for joining woods that can be reinforced (for example, see Patent Document 1).

Japanese Unexamined Patent Application Publication No. 2004-263548 (the paragraphs {0019} to {0040} of {Best Mode for Carrying Out the Invention} in the column of “Claims” and “Detailed Description of the Invention” and FIGS. reference)

  However, in the case of the method in which the conventional tenon and tenon holes and at least two dowel holes communicating in an oblique direction are formed and wood dowels and an adhesive are inserted into these dowel holes and bonded, The length is determined by the number, length, and thickness of dowel holes and wood dowels. To improve the adhesive strength, the number of dowel holes and wood dowels must be increased, and the cross section of the wood must be increased. Don't be. Therefore, it becomes expensive in terms of cost. Further, a connector is embedded in wood and connected with a connecting metal fitting through this connector. When a tensile force is applied to the connected wood, as shown in FIGS. 7 (a) and 7 (b). There was a problem that splitting occurred almost radially from the outer periphery of the connector at the end (wood end) of the wood.

A first invention of the present invention for solving the above-mentioned problems is a joining method for preventing splitting of wood as described in claim 1, and is as follows.
Wood as structural material in the method of joining vertical and horizontal members such as foundations, pillars and beams, vertical members and vertical members, horizontal members and horizontal members, and vertical members or horizontal members and diagonal members, which are structural materials of buildings A hole is first drilled in the wood mouth or side, a connector is inserted into this hole, and it is injected from the inlet with an injector with a nozzle. When the adhesive is discharged from the outlet, the injection of the adhesive is terminated. The wood and connector are integrated, and a split ring is embedded to cover the outer edge of the connector at the end of the wood where the part of the connector protrudes, preventing the splitting and connecting via the connector It is the structure which joins structural materials with metal fittings.

A second invention of the present invention for solving the above-mentioned problems is a joining method for preventing splitting of wood as described in claim 2, and is as follows.
Wood as structural material in the method of joining vertical and horizontal members such as foundations, pillars and beams, vertical members and vertical members, horizontal members and horizontal members, and vertical members or horizontal members and diagonal members, which are structural materials of buildings By inserting a circular hole having an inner diameter slightly larger than the outer diameter of the connector into the wooden mouth or side of the connector, the hole becomes thicker as it goes deeper, and by bonding the connector to this hole with an adhesive, The wood and connector are integrated, and a split ring is embedded in the end of the wood where the part of the connector protrudes to cover a part of the outer periphery of the connector to prevent splitting. Thus, the structural members are joined to each other by a connecting metal fitting.

A third invention of the present invention for solving the above-mentioned problems is a joining method for preventing splitting of wood as described in claim 3, and is as follows.
In the method of joining vertical members and cross members such as foundations, pillars and beams, vertical members and vertical members, cross members and cross members, and vertical members or cross members and diagonal members, which are structural members of buildings Drilling a spiral hole with a spiral groove having an inner diameter slightly larger than the outer diameter for inserting the connector into the connector, and adhering to this hole with an adhesive, the wood and the connector are integrated, and a part of the connector is A structure to prevent splitting by embedding a split ring to cover part of the outer periphery of the connector at the protruding wood end, and to connect the structural materials together with a connecting bracket etc. via this connector It is.

A fourth invention of the present invention for solving the above-mentioned problems is a joining method for preventing wood from splitting as described in claim 4, and is as follows.
In addition to the invention according to any one of claims 1 to 3, by adopting a spiral connector having a valley and a mountain, such as a bolt, the connector is rotated while the connector is rotated. In this configuration, the adhesive is spread over the entire surface to the entrance of the circular hole while passing through the spiral groove of the valley and mountain.

Since the joining method for preventing splitting of wood according to the present invention has the configuration as described above, the following effects are exhibited.
(1) When wood is connected to each other with a connecting bracket via a connector embedded in the end of the timber and a tensile force is applied, the end of the timber is split radially from the outer periphery of the connector, resulting in strength. The ring was buried in the end of the wood so as to cover the outer periphery of the connector, so that the problem was not split.
(2) With respect to claim 2, while preventing splitting and enlarging the back side of the hole, the adhesion strength and the tenacity are improved. As a result, the length of the connector of 400 mm was required, but it became better at 350 mm. In addition, the reliability of adhesive bonding has increased. When used for joints such as foundations, pillars and beams in wooden buildings, the adhesive strength has been improved, so the number of conventional connectors can be reduced and the embedding length can be shortened, and the joints can be kept more compact. be able to. Furthermore, it is possible to delay the decrease in the yield strength in the case of adhesive failure, which is also a drawback of adhesive bonding, thereby reducing the risk of building collapse.
(3) With respect to claim 3, while preventing the splitting and the hole is a spiral hole, the adhesive inserted into the bottom of the hole in combination with a spiral with valleys and peaks like the bolt of the connector is gradually The spiral groove and the spiral hole formed in the wood and the spiral groove are transferred to the inlet side, so that the adhesive fills a wide area and the adhesive strength can be increased.
(4) In order to bond the wood and the connector, it is necessary to sufficiently fill the gap between the wood and the connector. As for claim 4, as a method of preventing splitting and simply filling the adhesive, put the adhesive amount of the difference between the deposit of the connector and the deposit of the wood hole in the depth of the hole, The screw with a spiral screw) is inserted into the hole and the connector is rotated with a power tool etc., so that the adhesive placed in the back gradually moves to the inlet side, and the gap is filled with the adhesive. The effect is similar. In other words, the injection port and the discharge port, which are conventionally required, are not necessary, and no seal is necessary. Furthermore, the method for confirming the filling can be confirmed when the adhesive appears on the inlet side, and is very simple and reliable.

In the first embodiment of the present invention, a circular hole that becomes thicker toward the back is formed in the wood, and a connector in which a spiral groove such as a bolt is formed in the circular hole is inserted to the bottom of the circular hole while rotating. It is a schematic sectional view showing a state in which the adhesive is filled in the entire inner surface of the circular hole and the entire outer surface of the connector spiral groove. It is a joining cutaway top view of a pillar and a beam in the first example. FIG. 3 is a front view of a column-beam connection cut in the first embodiment of the present invention. In the second embodiment of the present invention, (a) a spiral hole is drilled in the wood, and a connector in which a spiral groove such as a bolt is formed in the spiral hole is rotated and inserted to the bottom of the spiral hole. It is a schematic sectional view showing a state in which the adhesive is filled with the adhesive on the entire surface inside the spiral hole and the entire surface outside the connector spiral groove, and (b) a schematic front view showing the lag screw bolt. It is a joining cutaway top view of a pillar and a beam which is the 2nd example of the present invention. It is a joining front view of the pillar and beam which are the 2nd example of the present invention. (A) which shows the split state produced when the tensile force in a prior art example is applied is a perspective view, (b) is a top view. FIG. 2A is a perspective view and FIG. 2B is a plan view showing a split state that occurs when a ring, which is a feature of the present invention, is attached to the outer periphery of a connector and a tensile force is applied.

  Wood as structural material in the method of joining vertical and horizontal members such as foundations, pillars and beams, vertical members and vertical members, horizontal members and horizontal members, and vertical members or horizontal members and diagonal members, which are structural materials of buildings A hole is first drilled in the wood mouth or side, a connector is inserted into this hole, and it is injected from the inlet with an injector with a nozzle. When the adhesive is discharged from the outlet, the injection of the adhesive is terminated. The wood and connector are integrated, and a hole with a slightly larger inner diameter than the outer diameter of the connector is drilled in the mouth or side of the structural wood, and the connector is inserted into this hole. By using an adhesive, the wood and the connector are integrated, and the split ring is used to cover a part of the outer periphery of the connector at the end of the wood where the part of the connector protrudes. Embedded to prevent splitting, It is a bonding method for preventing splitting wood linking bond the structural material together with connecting fitting or the like through the connector.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention. By drilling a circular hole 4 which becomes thicker toward the back in the wood, and inserting the connector 3 in which a spiral groove such as a bolt is formed in the circular hole 4 to the bottom of the circular hole 4 while rotating, In order to prevent wood from splitting at the end 8 of the wood so that the adhesive 5 is filled with the adhesive 5 on the entire surface inside the circular hole and the entire surface outside the connector, If it is a wooden 120 mm square pillar material, the material is made of metal or reinforced plastic, and a schematic cross section showing a ring 9 having an outer diameter of 60.5 mmφ, a thickness of 3.8 mm, and a height of 25 mm. Fig. In addition, in order for the ring 9 to exert the effect of preventing splitting, the material and size of the ring are various according to the kind and size of the wood such as the pillar 1, beam 2 and girder used. To choose. FIG. 2 is a plan view of the junction between the column 1 and the beam 2 in the first embodiment, FIG. 3 is a front view of the junction between the column 1 and the beam 2 in the first embodiment, and FIG. 4 is a second embodiment of the present invention. An example is given. The wood 5 is provided with a spiral hole 7, and the connector 3 in which a spiral groove such as a bolt is formed in the spiral hole 7 is inserted into the bottom of the spiral hole 7 while being rotated. Fig. 5 is a schematic cross-sectional view showing a state in which the entire surface inside the spiral hole and the entire outer surface of the spiral groove of the connector 3 are filled with the adhesive 5, and Fig. 5 is a sectional view of the column 1 and the beam 2 according to the second embodiment. FIG. 6 is a plan view of the joining between the column 1 and the beam 2 according to the second embodiment, FIG. 7 is a perspective view showing a split state that occurs when a tensile force is applied in the conventional example, and FIG. b) is a plan view, FIG. 8 is a perspective view showing a split state that occurs when a ring 9 that is a feature of the present invention is attached to the outer periphery of the connector 3 and a tensile force is applied, and FIG. 8B is a plan view. It is.

Generally, as the adhesive 5 when the connector 3 is a metal, a polyurethane resin adhesive or an epoxy resin adhesive is used. The destruction of the bonding portion between the wood and the connector 3 occurs at the wood portion, the interface between the wood and the adhesive 5, the adhesive layer, and the interface between the connector 3 and the adhesive 5. Most of them are destruction of the interface between the wood and the adhesive 5 and splitting of the wood. Many of the connectors 3 are not flat but irregularly shaped.
Therefore, the present invention can improve the adhesive strength between the wood and the connector 3, for example, to reduce the number of connectors 3 required to three so far to three. It is possible to reduce what needs to be done. Further, the length of the connector 3 can be shortened, and the cost can be reduced.

  The joint portion using the wood and the connector 3 is broken by cutting off the bonding portion where the wood and the connector 3 are bonded. Generally, in joints that use bolts and steel plates in combination, the bolts bend or cracks in and out of the wood part break down, so the proof stress decreases slowly, and it is not easy to collapse. If the bond breaks, there is a risk that the yield strength drops and collapses at once. Also, in the event of a large earthquake that exceeds expectations, adhesive bonding cannot be denied the risk of collapse.

In order to bond the wood and the connector 3, it is necessary to sufficiently fill the gap between the wood and the connector 3 with the adhesive 5. In order to fill the adhesive 5, it is necessary to provide an inlet and an outlet, which is troublesome. Further, since a pressure is applied at the time of injection, a seal for preventing leakage is necessary, and a time loss until the seal is cured is large in the work process.
Certainly, the connection between the wood and the connector 3 has become strong, but when an external force such as an earthquake is applied by connecting the pillar 1 made of wood, the beam 2, the girder, etc., as shown in FIG. If there is no reinforcement, cracks, that is, splittings 10, are generated radially from the outer periphery of the connector 3, and the connector 3 comes out of the pillar 1, the beam 2, the girder, etc. made of wood, and the connection is broken.
However, by embedding the ring 9 in the end portion of the wood so as to surround the outer periphery of the connector 3 as in the present invention, as shown in FIG. 8, the split 10 is not generated in the wood in the ring 9, Although the split 10 is generated on the outside of the ring 9, since the split is not generated in the ring 9 of the pillar 1 and the beam 2 made of wood, it is possible to prevent the connector 3 from being detached.

Therefore, in the first embodiment of the present invention, as shown in FIGS. 1 to 3, the back side of the circular hole 4 opened in the wood is made larger than the entrance side, and the connector 3 is bonded in the circular hole 4 of the wood. Thus, the connector 3 is structured to be difficult to pull out. As a result, the adhesive strength between the wood and the connector 3 is improved, and sticky adhesive bonding is possible.
Further, a reinforcing ring 9 for preventing the split 10 is made possible by embedding it in the end portion 8 of the pillar 1 made of wood, the beam 2 or the like.

  Further, as a specific example, the base material, the pillar 1, the beam 2 and the like vertical members and cross members, the vertical members and the vertical members, the cross members and the cross members, and the vertical members or the cross members, which are the structural materials of the building In the method of joining diagonal members, a circular hole 4 having an inner diameter slightly larger than the outer diameter of the connector 3 is drilled at the mouth or side surface of the wood by changing the size of the hole so that it becomes thicker toward the back. By filling the adhesive 5 in the back in advance and inserting the connector 3 in the back while rotating the connector 3, the adhesive is spread over the entire surface of the connector 3 while passing through the spiral groove of the connector 3. A wood and a connector in which the connector 3 is integrated, and a ring 9 is embedded in the wood pillar 1 and the end portion 8 of the beam 2 so as to surround the outer periphery of the connector 3 and is joined by the connecting metal fitting 6 or the like via this connector 3 Adhesive bonding It is the law.

In addition, as a method of filling the hole of the adhesive 5, the wood powder in the hole is removed as completely as possible by a suction type vacuum cleaner equipped with a tapered suction port that can be inserted into the hole, and the injection provided with the nozzle It is also possible to inject the adhesive 5 using a container or the like.
Further, when the adhesive 5 is put in a bag and inserted into the bottom of the hole, and the connector 3 is inserted into the hole, the adhesive 5 is pressed and ruptured with a strong pressure, and the adhesive 5 is poured out of the bag.

Next, in the second embodiment of the present invention, as shown in FIGS. 4 to 6, a spiral groove is cut in a straight hole previously formed in wood, and the connector 3 is bonded in the hole. The lag screw bolt 3 '(see FIG. 4B) is integrated so that the connector 3 is difficult to pull out. As a result, the adhesive strength between the wood and the connector 3 is improved, and sticky adhesive bonding is possible.
Furthermore, since the ring 9 is embedded in the end portion 8 of the column 1 and the beam 2 made of wood so as to surround the outer periphery of the connector 3, the splitting of the column 1 and the beam 2 can be prevented.
Needless to say, a lag screw bolt 3 ′ may be used instead of the connector 3.

  More specifically, it will be a description of the vertical and horizontal members of the foundation, pillar 1, beam 2, etc., which are the structural materials of the building, vertical members and vertical members, horizontal members and cross members, and vertical members or cross members and diagonal members. In the joining method, a straight spiral hole 7 having an inner diameter slightly larger than the outer diameter of the connector 3 at the mouth or side of the wood, or by changing the size of the spiral hole so as to increase in depth, and drilling, The adhesive 5 is filled in the depth of the spiral hole 7 in advance and the connector 3 is rotated and inserted into the depth of the connector. As a result, the wood and the connector 3 are integrated, and a ring 9 is embedded in the end 1 of the pillar 1 made of wood and the beam 2 so as to surround the outer periphery of the connector 3. Wood to be joined with An adhesive bonding method of the connector.

  It can be used for all wood-to-wood joints that are joined via connectors.

DESCRIPTION OF SYMBOLS 1 .... Column 2 .... Beam 3 .... Connector 3 '... Lug screw bolt 4 .... Round hole 5 .... Adhesive
6 .... Connecting bracket 7 .... Helical hole 8 .... End 9 .... Ring 10 .... Split

Claims (4)

Wood as structural material in the method of joining vertical and horizontal members such as foundations, pillars and beams, vertical members and vertical members, horizontal members and horizontal members, and vertical members or horizontal members and diagonal members, which are structural materials of buildings A hole is first drilled in the wood mouth or side, a connector is inserted into this hole, and it is injected from the inlet with an injector with a nozzle. When the adhesive is discharged from the outlet, the injection of the adhesive is terminated. The wood and connector are integrated, and a split ring is embedded to cover the outer edge of the connector at the end of the wood where the part of the connector protrudes, preventing the splitting and connecting via the connector A joining method for preventing splitting of wood, characterized in that structural members are joined together with metal fittings or the like. Wood as structural material in the method of joining vertical and horizontal members such as foundations, pillars and beams, vertical members and vertical members, horizontal members and horizontal members, and vertical members or horizontal members and diagonal members, which are structural materials of buildings Drill a circular hole with an inner diameter slightly larger than the outer diameter of the connector at the end or side of the wood, changing the size of the hole so that it becomes thicker toward the back, and bond the connector to this hole with an adhesive This prevents the splitting by integrating the wood and the connector, and embedding a split ring to cover the part of the outer periphery of the connector at the end of the wood where the part of the connector protrudes. The joining method which prevents the splitting of the wood characterized by joining with a connection metal fitting etc. through the. In the method of joining vertical members and cross members such as foundations, pillars and beams, vertical members and vertical members, cross members and cross members, and vertical members or cross members and diagonal members, which are structural members of buildings By drilling a spiral hole with a spiral groove having an inner diameter slightly larger than the outer diameter of the connector and bonding the hole with an adhesive, the wood and the connector are integrated, and a part of the connector protrudes. A wood for preventing splitting by embedding a split ring to cover a part of the outer periphery of the connector at the end of the wood on the side, and joining with a connecting bracket etc. via this connector Adhesive bonding method for connectors. By adopting a spiral connector with valleys and peaks like bolts, etc., the entire surface of the connector reaches the circular hole entrance while passing through the spiral grooves of the valleys and peaks by inserting the connector into the back while rotating. The joining method for preventing splitting of wood according to any one of claims 1 to 3, wherein the wood is split.

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