JP2015074930A - Joint structure of composite beam and column - Google Patents

Abstract

An object of the present invention is to provide a joint structure between a composite beam and a column member excellent in workability and joint strength. A composite beam 1 in which a wooden end member 4 is disposed on the surface of a steel frame member 3 and a column member 2, wherein the composite beam 1 penetrates at right angles to the length direction. A metal mortise pin 5 having a lateral hole 51 protrudes from the woody end material 4, and a mortise hole 21 is formed in the end of the pillar 2, and a through hole 22 is formed between a pair of opposing side surfaces. The reinforcing material 7 having higher strength than the pillar material 2 is combined and integrated with the pillar material 2 around the through hole 22 of the pillar material 2. In the state where the tenon pin 5 is inserted into the tenon hole 21 and the lateral hole 51 of the tenon pin 5 and the through hole 22 of the column member 2 coincide with each other, the drift pin 6 passes through the through hole 22. By being inserted into the horizontal hole 51, it is joined to the composite beam 1. [Selection] Figure 1

Description

  The present invention relates to a joint structure between a composite beam and a column member.

  So far, the present applicant has proposed a joint structure between a composite beam and a column material excellent in workability (Patent Document 1).

  Specifically, as shown in FIG. 9, in the joint structure of the composite beam 1 and the column member 2 of Patent Document 1, a wooden material is formed on the surface of each flat plate portion 31 of the steel frame member 3 having an H-shaped cross section. End material 4 is disposed. In the composite beam 1, a single mortise pin 5 having a horizontal hole 51 that penetrates at right angles to the length direction protrudes from the opening 41 of the wood end material 4 and stands. In the column member 2, one mortise 21 is formed at the mouth, and one through hole 22 is formed between a pair of opposing side surfaces. The column member 2 is joined to the composite beam 1 by inserting the tenon pin 5 into the tenon hole 21 and inserting the drift pin 6 into the horizontal hole 51 of the tenon pin 5 through the through hole 22 that coincides with the horizontal hole 51. The

Patent No. 3546819

  However, although the joint structure of Patent Document 1 is excellent in workability, it is considered that there is a point to be further improved in the joint strength. That is, the joint structure between the composite beam and the column member is required to have a joint strength that maintains the joint portion stably even when a tensile force is applied from the outside due to, for example, an earthquake.

  This invention is made | formed in view of the situation as mentioned above, and makes it the subject to provide the joining structure of the composite beam and column material excellent in workability and joining strength.

  In order to solve the above-described problem, the joint structure of the composite beam and the column material of the present invention is a joint structure of the composite beam in which the wood end material is disposed on the surface of the steel frame and the column material, In the composite beam, a metal mortise pin having a transverse hole penetrating at right angles to the length direction protrudes from the wood end material, and the column member is formed with a mortise hole formed in a mouth and a pair of opposing mortars. A through hole is formed between the side surfaces of the column material, and a reinforcing material having a higher strength than the column material is combined and integrated with the column material around the through hole of the column material, In the column material, the tenon pin is inserted into the tenon hole, and in a state where the horizontal hole of the tenon pin and the through hole of the column material coincide with each other, the drift pin is inserted into the horizontal hole through the through hole. And being joined to the composite beam.

  In the joint structure of the composite beam and the column material, the length of the reinforcing material from the center of the through hole toward the lower end of the column material is three times or more the width of the through hole, and the reinforcement The width of the material is preferably at least twice the width of the through hole.

In the joint structure of the composite beam and the column member, the reinforcing member preferably has a density of 800 kg / m ³ or more.

  In the joint structure of the composite beam and the column material, the reinforcing material is more preferably a molded material made of bamboo strands or hemp-based natural fibers.

  According to the joint structure of the composite beam and the column member of the present invention, it is possible to improve workability and joint strength.

It is the disassembled perspective view which illustrated 1st Embodiment of the joining structure of the composite beam and column material of this invention. FIG. 2 is a perspective view illustrating a state in which the composite beam illustrated in FIG. 1 and a column member are joined. It is the perspective view which illustrated 2nd Embodiment of the joining structure of the composite beam and column material of this invention. It is the perspective view which illustrated 3rd Embodiment of the joining structure of the composite beam and column material of this invention. It is the perspective view which illustrated 4th Embodiment of the junction structure of the composite beam and column material of this invention. It is the perspective view which looked at the pillar material and the reinforcing material which were used in Example 1 from the mouth side. It is the perspective view which looked at the pillar material and the reinforcing material which were used in Example 4 from the mouth end side. It is the perspective view which looked at the pillar material and the reinforcing material which were used in Example 6 from the mouth end side. It is the disassembled perspective view and perspective view which illustrated the junction structure of the conventional composite beam and column material.

  FIG. 1 is an exploded perspective view illustrating a first embodiment of a joint structure of a composite beam and a column member according to the present invention. FIG. 2 is a perspective view illustrating a state in which the composite beam illustrated in FIG. 1 and the column member are joined.

  In the composite beam 1, a wood end material 4 is disposed on the surface of a steel frame material 3. The steel frame material 3 is long and is formed in an H-shaped cross section in which opposed flat plate portions 31 are connected via a central vertical plate portion 32. From the surface of the flat plate portion 31, one metal mortise pin 5 is erected substantially perpendicular to the flat plate portion 31. The tenon pin 5 has a cylindrical shape and has a horizontal hole 51 that penetrates in a direction orthogonal to the length direction of the steel frame 3.

  A circular opening 41 is formed in the wood end material 4 at a position corresponding to the tenon pin 5 of the steel frame material 3.

  As illustrated in FIG. 2, in the composite beam 1, the tenon pin 5 joined to the surface of the steel frame member 3 is inserted into the circular opening 41 of the wooden end member 4, and the tenon pin 5 protrudes from the wooden end member 4. ing.

The column material 2 has a prismatic shape, and the material is not particularly limited. Specifically, for example, the material of the column member 2 can be a solid material or a laminated material. For example, as laminated wood, laminated wood with glue glued together, cedar laminated wood, whitewood laminated wood, redwood laminated wood, cypress laminated wood, larch laminated wood, bay pine laminated wood, hiba laminated wood, etc. Can be illustrated. Further, for example, as a solid material, a cedar solid material, a cypress solid material, a pure hiba material, and the like can be exemplified. The approximate specific gravity (density) of the material used for these column members 2 is generally in the range of 350 to 600 kg / m ³ .

  One mortise 21 is formed in the lower end of the column 2. The mortise 21 has a circular cross section and corresponds to the protruding length and diameter of the mortise pin 5 protruding from the composite beam 1.

  The column member 2 has one cylindrical through hole 22 formed between a pair of opposing side surfaces. The through hole 22 and the mortise 21 intersect near the center of the column member 2.

  Around the through hole 22 of the pillar member 2, a reinforcing member 7 having a higher strength than the pillar member 2 is disposed in a composite and integrated manner with the pillar member 2. In the form illustrated in FIGS. 1 and 2, the reinforcing member 7 is composite-integrated so as to oppose two inner portions of the side surface of the column member 2 in which the through holes 22 are opened. Is formed in a prismatic shape having a height from the lower end of the mortar to the vicinity of the top of the mortise 21. Accordingly, the through hole 22 is in a state where the periphery thereof is covered with the reinforcing material 7 in the region near the inside of the side surfaces on both sides of the column member 2.

  In the column 2, the mortise pin 5 is inserted into the mortise 21, and the drift pin 6 is inserted into the lateral hole 51 through the through hole 22 in a state where the lateral hole 51 of the mortise pin 5 and the through hole 22 of the pillar 2 match. Thus, the composite beam 1 and the column member 2 are joined.

  In this joining structure, since the joining structure can be assembled only by inserting the drift pin 6 into the through hole 22 and the lateral hole 51 of the tenon pin 5, a nail or the like is unnecessary, and the workability is excellent. Furthermore, in this joining structure, when a tensile force is applied to the column member 2, the load from the drift pin 6 inserted into the through hole 22 is supported by the surrounding reinforcing material 7. And since the reinforcing material 7 is stronger than the column material 2, the through hole 22 of the column material 2 is not easily broken, and the load supporting the drift pin 6, that is, the tensile strength of the column material 2 is greatly improved. High joint strength against tensile force is realized.

  Here, the reinforcing material 7 is not particularly limited as long as it has a higher strength than the pillar material 2. Specifically, as a material of the reinforcing material 7, for example, LVL (Laminated Veneer Lumber) or plywood composed of a high specific gravity (high density) / high strength wood veneer can be exemplified. . Furthermore, for example, LVL or plywood laminated with phenol resin impregnated single plates, fiber reinforced plastics reinforced with glass fibers, carbon fibers, aramid fibers, and the like can be exemplified. Moreover, the molding material etc. which are comprised from a bamboo or hemp fiber can be illustrated.

Further, as a measure of the strength of the reinforcing material 7, the density can be used as a reference, and the density is preferably 800 kg / m ³ or more. As a result, the tensile strength of the column 2 is further increased, so that the joint strength of the connection structure is improved.

  Especially, as a material of the reinforcing material 7, the molding material which consists of bamboo strands and hemp system natural fiber can be illustrated preferably.

  Here, the bamboo strand is a material obtained by vertically dividing a bamboo raw material, and has a structure including a high-strength plant fiber layer called a vascular bundle. For this reason, a very high-strength molded body can be obtained by laminating and bonding so that the fiber directions of the bamboo strands are aligned.

In addition, when laminating and bonding bamboo strands, a hot press can generally be used, but a molding material having a density of 800 kg / m ³ or more can be easily obtained by appropriately setting the temperature and pressure at that time. It becomes possible.

  Specific examples of the molded body using bamboo strands include bamboo LVL and bamboo PSL (parallel strand lumber). Bamboo LVL is obtained by laminating bamboo strands with a substantially constant thickness in the thickness direction. Bamboo PSL is a block-shaped block of irregularly shaped bamboo strands that are compressed at high pressure with the same orientation. It is obtained by molding. In addition, it is mentioned that the growth of the bamboo material used as the raw material of bamboo PSL is very fast. It grows to a diameter of 20-30cm and a height of 10m or more that can be used as a material in approximately 3 years. The distribution range is extremely wide, and it grows all over the world except dry and cold regions. The bamboo forest area in Asia, such as India, China, Myanmar, and Vietnam, is particularly large and stable in the future. It is considered a plant-based resource that can be supplied.

  Furthermore, since it has extremely excellent strength with respect to the fiber direction of the bamboo strand, for example, when using bamboo LVL or bamboo PSL as the reinforcing material 7, the fiber direction of the pillar material 2 and the fiber direction of bamboo LVL or bamboo PSL Are preferably combined and integrated. As a result, the tensile strength of the column member 2 is further increased, and it is possible to have a higher bonding strength with respect to the tensile force.

Further, it is also preferable to use a reinforcing material 7 formed by bonding hemp-based natural fibers having an average length of 5 to 100 mm and an average diameter of 20 to 400 μm with an adhesive. By using a hemp-based natural fiber molded body as the reinforcing material 7, a bonded structure having a high bonding strength with respect to a tensile force can be obtained. The material of the hemp-based natural fiber is not specifically limited, and examples thereof include fibers obtained from hemp-based plants such as jute, kenaf, flax, ramie, hemp, and sisal. Since these hemp plants can obtain high-density and high-strength fibers, a molding material having a density of 800 kg / m ³ or more can be easily obtained by appropriately setting the lamination molding conditions.

  For example, the type of adhesive used for the molding material such as bamboo LVL and bamboo PSL is not particularly limited. Specific examples include formaldehyde adhesives such as phenol resins, resorcinol resins, urea resins, and melamine resins, isocyanate resin adhesives, urethane resin adhesives, and the like. Furthermore, the form of the adhesive is not particularly limited, and may be, for example, powder or solution.

  The size of the reinforcing member 7 is such that the length L1 from the center of the through hole 22 to the lower end direction of the pillar member 2 is at least three times the diameter of the through hole 22 and the width L2 (through hole) of the reinforcing member 7 The length in the direction corresponding to the width of the hole 22 is preferably at least twice the width of the through-hole 22 of the column member 2. Here, the width of the through hole 22 means a diameter of a circular cross section when the through hole 22 is cylindrical. When the size of the reinforcing member 7 is within this range, the load from the drift pin 6 inserted into the through hole 22 can be reliably supported by the reinforcing member 7, and the tensile strength of the column member 2 is further greatly improved. High joint strength against tensile force is realized. Further, the longitudinal length L4 of the reinforcing member 7 is larger than the arrangement height (distance from the lower end portion) of the through hole 22, and the through hole 22 opens as illustrated in FIGS. When the reinforcing material 7 is provided at two locations near the side surface of the pillar material 2 that is provided, the depth length L3 of one reinforcing material 7 (the length in the direction parallel to the length direction of the through hole 22) is It is preferable that it is about 1/3 of the width (length between side surfaces) of the column member 2. As a result, the load from the drift pin 6 inserted into the through hole 22 can be reliably supported by the reinforcing material 7, the tensile strength of the column 2 is further improved, and a high bonding strength against the tensile force is realized. The

  FIG. 3 is a perspective view illustrating a second embodiment of the joint structure of the composite beam and the column member 2 according to the present invention. Portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted below.

  In this joining structure, the reinforcing material 7 has a rectangular column shape that is long in the length direction of the through hole 22, and is integrally integrated along the through hole 22 between the opposing side surfaces of the column material 2. That is, the depth of the reinforcing member 7 is designed to be equal to the length of the through hole 22. Therefore, the through hole 22 is covered with the reinforcing material 7 in the entire region in the length direction, and the inserted drift pin 6 is supported by the reinforcing material 7 in the entire region (the entire length and the entire circumference).

  Also in this joint structure, when a tensile force is applied to the column member 2, the load from the drift pin 6 inserted into the through hole 22 is reliably supported by the reinforcing member 7. And since the reinforcing material 7 is stronger than the column material 2, the through hole 22 of the column material 2 is not easily broken, and the load supporting the drift pin 6, that is, the tensile strength of the column material 2 is greatly improved. High joint strength against tensile force is realized.

  The size of the reinforcing material 7 in this joint structure is preferably such that the width L2 of the reinforcing material 7 is twice or more the width of the through hole 22 of the pillar material 2. When the size of the reinforcing member 7 is within this range, the load from the drift pin 6 inserted into the through hole 22 can be reliably supported by the reinforcing member 7, and the tensile strength of the column member 2 is further greatly improved. High joint strength against tensile force is realized.

  FIG. 4 is a perspective view illustrating a third embodiment of a joint structure of a composite beam and a column member according to the present invention. Portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted below.

  In this joining structure, columnar reinforcing members 7 extending in parallel with the length direction of the through hole 22 are combined with the column member 2 at two locations inside the side surface of the column member 2 where the through hole 22 is open. The reinforcing material 7 covers the periphery of the through hole 22 in the vicinity of the inside of the side surface of the pillar material 2.

  Also in this joint structure, when a tensile force is applied to the column member 2, the load from the drift pin 6 inserted into the through hole 22 is reliably supported by the reinforcing member 7. And since the reinforcing material 7 is stronger than the column material 2, the through hole 22 of the column material 2 is not easily broken, and the load supporting the drift pin 6, that is, the tensile strength of the column material 2 is greatly improved. High joint strength against tensile force is realized.

  As for the size of the reinforcing member 7 in this joining structure, it is preferable that the diameter R of the column is three times or more the width of the through hole 22 of the column member 2. When the size of the reinforcing member 7 is within this range, the load from the drift pin 6 inserted into the through hole 22 can be reliably supported by the reinforcing member 7, and the tensile strength of the column member 2 is further greatly improved. High joint strength against tensile force is realized.

  FIG. 5 is a perspective view illustrating a fourth embodiment of the joint structure between the composite beam and the column member of the present invention. Portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted below.

  In this joining structure, the reinforcing member 7 is a prismatic shape that is long in the vertical direction of the column member 2, and is composite-integrated so as to face two locations inside the side surface of the column member 2 in which the through holes 22 are open. Yes. Therefore, in the region of the through hole 22 located near the inside of the side surfaces on both sides of the column member 2, the periphery is covered with the reinforcing material 7. The lower end of the reinforcing member 7 does not reach the bottom end of the pillar member 2 and is disposed only around the through hole 22.

  Also in this joint structure, when a tensile force is applied to the column member 2, the load from the drift pin 6 inserted into the through hole 22 is reliably supported by the reinforcing member 7. And since the reinforcing material 7 is stronger than the column material 2, the through hole 22 of the column material 2 is not easily broken, and the load supporting the drift pin 6, that is, the tensile strength of the column material 2 is greatly improved. High joint strength against tensile force is realized.

  The size of the reinforcing member 7 in this joint structure is such that the length L1 from the center of the through hole 22 toward the lower end of the column member 2 is three times or more the diameter of the through hole 22, and the width L2 of the reinforcing member 7 However, it is preferable that the width of the through hole 22 of the column member 2 is twice or more. When the size of the reinforcing member 7 is within this range, the load from the drift pin 6 inserted into the through hole 22 can be reliably supported by the reinforcing member 7, and the tensile strength of the column member 2 is further greatly improved. High joint strength against tensile force is realized. The longitudinal length L4 is preferably about twice as long as the length L1 from the center of the through hole 22 toward the lower end of the column member 2. Moreover, the depth length L4 (length in a direction parallel to the length direction of the through hole 22) of one reinforcing member 7 is about 1/3 of the width (length between side surfaces) of the column member 2. It is preferable.

  As described above, the present invention is a joint structure of the composite beam 1 in which the wood end material 4 is disposed on the surface of the steel frame material 3 and the column material 2. In the composite beam 1, a metal mortise pin 5 having a lateral hole 51 penetrating at right angles to the length direction protrudes from the wood end material 4. The column member 2 has a mortise 21 formed in the mouth, and one through hole 22 is formed between a pair of opposing side surfaces. A reinforcing material 7 having higher strength than the material 2 is combined and integrated with the column material 2. In the column 2, the mortise pin 5 is inserted into the mortise 21, and the drift pin 6 is inserted into the lateral hole 51 through the through hole 22 in a state where the lateral hole 51 of the mortise pin 5 and the through hole 22 of the pillar 2 match. Thus, the composite beam 1 is joined.

  The joint structure of the composite beam and the column material of the present invention is not limited to the above embodiment. Specifically, for example, the shape of the reinforcing member can be appropriately designed in a shape and an arrangement position that can stably support the drift pin inserted so as to cover the through hole of the column member. In addition, the shape of the mortise pin and the shape and structure of the steel frame can be designed as appropriate. For example, the mortise pin may have a structure that can be fixed to the column member by inserting a drift pin into the horizontal hole.

  Hereinafter, although the connection structure of the composite beam and the column material of the present invention will be described in more detail in the examples, the connection structure of the composite beam and the column material of the present invention is not limited to the following examples.

<Example 1>
As a steel frame, a 3 mm thick H-shaped steel material (width: 100 mm, 100 mm) with a mortise pin with a diameter of 22 mm is used, and this H-shaped steel mortise pin is inserted into the opening of a wooden edge (width: 105 mm, thickness: 30 mm). Thus, a composite beam in which tenon pins protruded from the wood ends was formed. The center position of the horizontal hole of the mortise pin is designed to be 50 mm from the lower end of the column material while being inserted into the mortise 21 of the column material.

  FIG. 6 is a perspective view of the pillar material and the reinforcing material used in Example 1 as viewed from the mouth end side.

As the material of the pillar material 2, a spruce laminated material having a side length of 105 mm was used. The density of this column material was 450 kg / m ³ .

Bamboo PSL obtained by the following method was used as the reinforcing material 7.
(1) As a bamboo material, 2m long cut Miso bamboo with a diameter of about 20cm was divided by a bamboo splitting machine to obtain a bamboo plate material with a width of about 30mm and a thickness of 10-15mm.
(2) After heating the flat plate material to dry the moisture content to 15% or less, the rough cut machine is used to cut and remove the green skin part and the soft cell part on the back side of the bamboo surface. By cutting, a bamboo strand having a thickness of about 5 to 10 mm, a width of about 25 mm, and a length of about 400 mm was obtained.
(3) After applying a water-soluble phenolic resin adhesive to the obtained bamboo strand, it is laminated as appropriate so that its fiber direction is aligned, and then hot-pressed at a temperature of 150 ° C for 30 minutes, bamboo PSL Finished. Thereafter, the bamboo PSL was cut to obtain a reinforcing material 7 having a width L2: 30 mm, a depth length L3: 30 mm, and a longitudinal length L4: 100 mm. It was confirmed that the density of bamboo PSL after processing was 1150 kg / m ³ . That is, the reinforcing material 7 has higher strength than the pillar material made of the spruce aggregate.

  Then, in the shape shown in FIG. 6, the vicinity of the lower end portion of the side surface of the pillar material was cut out in accordance with the size of the bamboo PSL reinforcing material 7 and combined and integrated using a one-pack polyurethane resin adhesive. After that, the reinforcing material 7 was formed between the side surfaces of the pillar material through a through hole 22 having a diameter of 13 mm for inserting a drift pin. Furthermore, a mortise 21 (diameter 22 mm, depth 70 mm) for inserting a mortise pin was formed by drilling. The reinforcing member 7 has a length L1 from the center position of the through hole 22 of the pillar member to the lower end of the reinforcing member 7 of 50 mm.

  The mortise pin of the composite beam was inserted into the mortise 21 of the top of the pillar material combined with the reinforcing material 7, and the positions of the horizontal hole of the mortise pin and the through hole 22 of the pillar material were matched. Furthermore, a drift pin having a diameter of 13 mm made of galvanized steel was inserted from the through hole 22 of the column material, and was pushed into the side hole of the mortise pin to form a joining structure.

<Example 2>
A joining structure was obtained in the same manner as in Example 1 except that an FRP molding material was used in place of bamboo PSL as the reinforcing material combined with the column material.

The FRP used as the reinforcing material was a glass fiber reinforced plastic made of an unsaturated polyester resin containing 25% glass fiber, and the density was 1800 kg / m ³ . That is, this reinforcing material has higher strength than a pillar material made of a spruce aggregate. This reinforcing material was combined and integrated with a pillar material cut out in the size of the reinforcing material.

<Example 3>
A joining structure was obtained in the same manner as in Example 1 except that a jute fiber board was used in place of bamboo PSL as a reinforcing material combined with the column material.

  Jute fibers having an average length of 5 to 100 mm and an average diameter of 20 to 400 μm were used as raw fibers constituting the fiber board. Further, granular phenol resin powder was used as an adhesive, and the resin powder was added to the jute fiber so that the content of the adhesive was 22%. The phenol resin powder used as the adhesive was novolak type phenol, and the average particle size was about 20 μm.

  Next, the mixture of the jute fiber and the granular adhesive is put into a small cotton blender having a pinned cylinder so that the raw fiber and the adhesive are mixed uniformly, and then a mechanism for spraying the mixture is provided. Using a simple forming device (inner size: 30 cm square), it was formed into a fiber mat shape. After forming the fiber mat into a shape and lightly pressing the fiber mat with an upper lid, the fiber mat is removed from the mold and heated at 140 ° C. for about 1 minute while lightly pressing the mat with a small hot press machine. A fiber mat that can be handled was obtained by melting.

Thereafter, the fiber mat is laminated so that a board having a predetermined thickness and density is obtained, and is heated and pressed under the conditions of 180 ° C., 4 MPa, 30 minutes using the small press machine, and the size is 30 cm square. A 30mm thick jute fiber board was obtained. The density of the board used for the reinforcing material was about 950 kg / m ³ . That is, this reinforcing material has higher strength than a pillar material made of a spruce aggregate. This reinforcing material was combined and integrated with a pillar material cut out in the size of the reinforcing material.

<Example 4>
FIG. 7 is a perspective view of the pillar material and the reinforcing material used in Example 4 as viewed from the end side.

  A joined structure was obtained in the same manner as in Example 1 except that the reinforcing material composite structure of the pillar material was the shape and size of the reinforcing material shown in FIG.

  Specifically, the size of the reinforcing material 7 made of bamboo PSL was a width L2: 70 mm, a depth length L3: 30 mm, and a longitudinal length L4: 50 mm. This reinforcing material 7 was combined and integrated with a pillar material cut out to the size of the reinforcing material 7. Further, the length L1 from the center position of the through hole 22 of the column member to the lower end direction of the reinforcing member 7 was set to 40 mm.

<Example 5>
A joining structure was obtained in the same manner as in Example 4 except that bamboo LVL was used instead of bamboo PSL as the material of the reinforcing material combined with the column material.

As a raw material for bamboo LVL, the 5 mm thick bamboo flat plate was cut as the finishing process of bamboo strands with a thickness of about 5-10 mm, a width of about 25 mm, and a length of 400 mm as described in Example 1. Was used. After applying 200 g / m ² of aqueous vinyl urethane adhesive to the resulting bamboo flat plate, the layers were properly laminated so that the fiber directions were aligned, and subjected to hot pressing at a temperature of 150 ° C. for 30 minutes, a length of 400 mm, A bamboo LVL with a width of 200 mm and a thickness of 30 mm was obtained. In addition, it is preferable to laminate | stack a bamboo flat plate, shifting each layer so that the seam of the width direction may not overlap, and it is preferable to laminate | stack also about the joint of the length direction so that it may not overlap. In Example 5, a 6-layer laminated bamboo LVL was finished. The obtained bamboo LVL was cut to obtain a reinforcing material having a width L2: 70 mm, a depth length L3: 30 mm, and a longitudinal length L4: 50 mm. The density of the reinforcing material after processing was 850 kg / m ³ . That is, this reinforcing material has higher strength than a pillar material made of a spruce aggregate. This reinforcing material was combined and integrated with a pillar material cut out in the size of the reinforcing material. And length L1 from the center position of the through-hole 22 of a pillar material to the lower end direction of a reinforcing material was 40 mm.

<Example 6>
FIG. 8 is a perspective view of the pillar material and the reinforcing material used in Example 6 as viewed from the end side.

  A joining structure was obtained in the same manner as in Example 3 except that the composite structure of the reinforcing members in the columnar material had a shape as shown in FIG.

  The size of the reinforcing material 7 made of jute fiber board is width L2: 40 mm, depth length L3: 105 mm, and vertical length L4: 80 mm. From the central position of the through hole 22 of the column material, the reinforcing material 7 The length L1 in the lower end direction was 40 mm. The reinforcing member 7 has a rectangular column shape that is long in the length direction of the through hole 22, and is integrally integrated along the through hole 22 between the opposing side surfaces of the column member. This reinforcing material 7 was combined and integrated with a pillar material cut out to the size of the reinforcing material 7.

<Example 7>
A joined structure was obtained in the same manner as in Example 1 except that the longitudinal length of the reinforcing material was 85 mm. The length L1 from the center position of the through hole toward the lower end of the reinforcing material was 35 mm.

<Example 8>
A joined structure was obtained in the same manner as in Example 1 except that the width L2 of the reinforcing material was 25 mm.

<Comparative Example 1>
A spruce laminated material not combined with a reinforcing material was used as a pillar material, and a joined structure was obtained in the same manner as in Example 1.

<Comparative Example 2>
A commercially available hole-down hardware was applied to the joint structure shown in Comparative Example 1 to obtain a joint structure in which the joint portion between the composite beam and the column member was reinforced. The standard proof stress of the hole-down hardware was 25 kN.

  The tensile strength performance was evaluated for the joint structures prepared in Examples 1 to 8 and Comparative Examples 1 and 2. As a method for evaluating the proof stress, a test specimen was obtained in which the length of the composite beam portion of the joint structure obtained in the example and the comparative example was 900 mm, and the length of the column member was 600 mm.

  The composite beam is fixed to a large tensile testing machine, a tensile jig is attached at a position 100 mm from the upper end of the column material joined to the composite beam, and a tensile test at a constant speed is performed until the joint is broken. The load was measured.

  The obtained results are shown in Table 1.

  In Table 1, the maximum load is 50 kN or more, ◎, 40 kN or more is ◯, 20 kN or more is Δ, and less than 20 kN is ×. At the same time, the workability and workability are evaluated, and based on the workability and workability of Comparative Example 1 corresponding to the prior art, the judgment result is equivalent to ○, slightly inferior to △, inferior. Indicated as x.

  As shown in Table 1, in the joining structures of Examples 1 to 6, the maximum load is as high as about 45 kN (44.8 kN in Example 2) or more, which is 2.5 times or more compared to the joining structure of Comparative Example 1. It was confirmed to have proof stress performance. Moreover, it was confirmed that the joining structure of Examples 1-6 has the maximum load more than an equivalent level with the joining structure of the comparative example 2 using a hole down metal fitting.

  Moreover, when Example 1 and Example 7 are compared, in Example 1 (3.8 times) in which the length from the center of the through hole 22 to the lower end direction of the column member is 3 times or more with respect to the diameter of the through hole 22, It was confirmed that the maximum load was superior to Example 7 (2.3 times) less than double.

  Furthermore, when Example 1 and Example 8 are compared, in Example 1 (2.3 times) in which the magnification of the width of the reinforcing material with respect to the diameter of the through hole 22 is 2 times or more, Example 8 (1.9 times) less than 2 times. It was confirmed that the maximum load was superior.

  In this way, the size of the reinforcing material is sufficiently large with respect to the diameter of the through hole 22 (drift pin diameter), and even when the column material is subjected to a strong tensile force, the reinforcing material drifts without being destroyed. The load for supporting the pin, that is, the tensile strength of the column material is increased. As a result, the joint structure between the composite beam and the column member can have high joint strength.

Furthermore, for example, when Examples 1 and 3 are compared with Example 2, in Examples 1 and ³ , molding with a density of 800 kg / m ³ or more made of bamboo strands and hemp-based natural fibers that are high in strength against tensile force. Since the material is used as a reinforcing material, it can be seen that the joint structure has particularly excellent tensile strength performance.

  As described above, the joining structures shown in Examples 1 to 8 are excellent in workability because the structure is assembled only by inserting the drift pins into the through holes, and have a high joining strength against the tensile force. confirmed.

DESCRIPTION OF SYMBOLS 1 Composite beam 2 Column 21 Mortise 22 Through-hole 3 Steel frame
4 Wood edge 5 Mortise pin 51 Side hole 6 Drift pin 7 Reinforcement material

Claims (4)

It is a joint structure of a composite beam in which a wooden end material is arranged on the surface of a steel frame, and a pillar material,
In the composite beam, a metal mortise pin having a horizontal hole penetrating at right angles to the length direction protrudes from the wood end material,
The column member has a mortise formed in a mouth end, and one through hole is formed between a pair of opposing side surfaces, and the column member is provided around the through hole of the column member. Reinforcing material with higher strength is combined and integrated with the pillar material,
In the column member, the tenon pin is inserted into the tenon hole, and the drift pin is inserted into the horizontal hole through the through hole in a state where the horizontal hole of the tenon pin and the through hole of the column member coincide with each other. The bonded structure of a composite beam and a column material, wherein the bonded structure is bonded to the composite beam.   The length of the reinforcing material from the center of the through hole toward the lower end of the column member is at least three times the width of the through hole, and the width of the reinforcing material is 2 times the width of the through hole. The joint structure of a composite beam and a column material according to claim 1, wherein the structure is two times or more. The joint structure of a composite beam and a column material according to claim 1, wherein the reinforcing material has a density of 800 kg / m ³ or more. The said reinforcement material is a molding material which consists of a bamboo strand or hemp system natural fiber, The joining structure of the composite beam and column material as described in any one of Claim 1 to 3 characterized by the above-mentioned.

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