JP2009062695A - Reinforcement method and reinforcement structure for wooden structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement method for a wooden structure capable of preventing a fixing member from being pulled out of a base or damaged and fallen due to insufficient shear strength, enhancing the effect of rigidity of the surfaces including the joined and non-joined parts with a structural member, and preventing the variation of quality of construction by a constructor with a simple construction method from occurring. <P>SOLUTION: In this method for reinforcing a wooden structure by using a reinforcement member, the wooden structure is reinforced by using a photo-curing fiber-reinforced prepreg sheet 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reinforcing method and a reinforcing structure for reinforcing a wooden structure using a photocurable fiber reinforced sheet as a reinforcing member. Specifically, a photocurable fiber reinforced sheet is bonded or wrapped around the joints of columns, beams, bracing, etc. as structural members, and each structural member alone, and light is straddled across the concrete foundation and foundation, pillars, bracing. The present invention relates to a reinforcing method and a reinforcing structure for improving the strength of a wooden structure by bonding a curable fiber-reinforced sheet.

  The collapse of wooden structures due to large-scale earthquakes such as the Great Hanshin-Awaji Earthquake and Chuetsu Earthquake has become a major social problem in recent years, and the improvement and improvement of the earthquake resistance of wooden structures has become a social demand. The main features of collapse of wooden structures in the event of a large-scale earthquake are damage to the columns, beams, and bracing joints that make up the structure, and collapse due to pulling out of the foundation and foundation.

  For such social problems, reinforcement methods using various reinforcing members have been introduced and proposed, and improvement and improvement of seismic performance have been confirmed.

  Specifically, there is a construction method in which a metal is fixed to a joint with a nail or bolt as a fixing member, and the joint is reinforced. Generally, hardware is fixed with nails or bolts, but when excessive deformation occurs in a large-scale earthquake, pulling out of the fixing member from the base material or breakage due to insufficient shear strength of the fixing member causes The joint can be damaged and can collapse.

  In addition, there is a construction method in which a continuous fiber such as an aramid fiber is bonded to a joint portion with an epoxy resin to prevent the structural member from being pulled out (for example, Patent Document 1). According to such a technique, since it becomes surface adhesion to the structural member, the problem at the time of using the hardware is solved, but since a process of impregnating continuous fibers occurs at the site, in order to ensure construction quality Construction by an expert is essential. In addition, due to the limitations of construction methods, generally, continuous fibers are bonded to the surface of structural members that constitute the joints to improve the seismic performance of the joints, but the entire joints composed of structural members and spaces like hardware. It is difficult to reinforce (rigid zone), and there is a drawback that sufficient resistance to the rotational moment of the joint during an earthquake cannot be obtained.

JP 2001-279814 A

  The present invention has been implemented in view of such a current situation, and prevents the fixing member from being pulled out of the base material or the fixing member from being damaged or collapsed due to insufficient shear strength, and the bonded portion and non-bonding with the structural member. It is an object of the present invention to provide a method for reinforcing a wooden structure that achieves an increase in the surface rigidity effect including a portion, and that prevents a variation in construction quality by a simple construction method and a builder.

  In order to achieve the above object, a first structure of a method for reinforcing a wooden structure according to the present invention is a method for reinforcing a wooden structure using a reinforcing member, wherein the wooden structure is formed using a photocurable fiber-reinforced prepreg sheet. The joint portion of each structural member of the structure is reinforced.

  The second configuration of the reinforcing method for a wooden structure according to the present invention is the first configuration, in which the photocurable fiber-reinforced prepreg sheet is connected to each structure at a joint portion of each structural member of the wooden structure. After bonding across the members, the light-curing fiber-reinforced prepreg sheet is light-cured to reinforce the joints of the structural members of the wooden structure.

  Further, according to a third configuration of the method for reinforcing a wooden structure according to the present invention, in the first and second configurations, the reinforcement of the joint portion of each structural member of the wooden structure has a resistance against a rotational moment. It is characterized by reinforcing the reinforcement.

  According to a fourth configuration of the method for reinforcing a wooden structure according to the present invention, in the first configuration, as a joint portion of each structural member of the wooden structure, a concrete base, a foundation, a column, a brace After the photocurable fiber-reinforced prepreg sheet is bonded across at least one of the structural members, the photocurable fiber-reinforced prepreg sheet is photocured.

  The fifth structure of the method for reinforcing a wooden structure according to the present invention is a method for reinforcing a wooden structure using a reinforcing member, wherein a photocurable fiber-reinforced prepreg sheet is attached to each structural member of the wooden structure. After bonding or winding, the photocurable fiber-reinforced prepreg sheet is photocured to reinforce each structural member.

  Moreover, the 6th structure of the reinforcement method of the wooden structure which concerns on this invention is laminated | stacked so that the reinforcement fiber direction of the said photocurable fiber reinforced prepreg sheet may be substantially orthogonal in the said 1st-5th structure. It is characterized by becoming.

  Further, the structure of the reinforcing structure for a wooden structure according to the present invention is characterized in that the reinforcing structure for a wooden structure using a reinforcing member is reinforced using any of the above-described reinforcing methods for a wooden structure. .

  According to the first and second configurations of the method for reinforcing a wooden structure according to the present invention, the reinforcing member is used as a reinforcing member for a joint portion such as a pillar, a beam, a brace which is a structural member of the wooden structure. A curable fiber-reinforced prepreg sheet can be bonded to each structural member, restraining deformation and displacement of the joint, and improving earthquake resistance.

  According to the 3rd structure of the reinforcement method of the wooden structure which concerns on this invention, when the junction part of each structural member of a wooden structure is reinforced with a photocurable fiber reinforced prepreg sheet, an adhesion part and a non-adhesion part are provided. By providing it, the tensile resistance and the shear resistance between the structural members are strengthened at the bonded portion, and the presence of the non-bonded portion can greatly enhance the resistance to the rotational moment, that is, the rigidity can be strengthened.

  According to the fourth configuration of the method for reinforcing a wooden structure according to the present invention, the photocurable fiber-reinforced prepreg sheet is bonded across the foundation of the wooden structure and the foundation, pillars, braces, and the foundation from the foundation in the event of an earthquake. It is possible to restrain the displacement caused by the phenomenon of lifting up and prevent the wooden structure from collapsing.

  According to the fifth configuration of the method for reinforcing a wooden structure according to the present invention, the axis of each structural member is obtained by bonding or winding a photocurable fiber-reinforced prepreg sheet to a structural member such as a column, a beam, a brace, or a base. Direction, shear, and bending strength can be improved.

  According to the sixth configuration of the method for reinforcing a wooden structure according to the present invention, a bonded portion or a structural member is obtained by laminating and bonding or winding so that the reinforcing fiber directions of the photocurable fiber-reinforced prepreg sheet are substantially orthogonal to each other. Can be improved to the required seismic strength.

  According to the configuration of the reinforcing structure of the wooden structure according to the present invention, the fixing member is pulled out from the base material or the fixing member is prevented from being damaged and collapsed due to insufficient shear strength, and the bonded portion and the non-bonded portion with the structural member. It is possible to provide a reinforcing structure for a wooden structure that achieves an increase in the surface rigidity effect that includes a simple construction method and variation in construction quality by the construction person.

  An embodiment of a reinforcing method and a reinforcing structure for a wooden structure according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic front view showing a state in which the joint portion of each structural member of a wooden structure is reinforced with a photocurable fiber reinforced prepreg sheet, and FIG. 2 is a diagram in which the photocurable fiber reinforced prepreg sheet is bonded across the foundation and the base. FIG. 3 is a schematic front view showing a state in which a photocurable fiber reinforced prepreg sheet is wrapped around various structural members and reinforced, and FIG. 4 is a schematic diagram showing a photocurable fiber in a joint or various structural members. The front schematic diagram which shows a mode that the reinforcement | strengthening prepreg sheet | seat was laminated | stacked and reinforced is shown.

  FIGS. 1 to 4 show a bonding portion of each structural member of a wooden structure with a photocurable fiber reinforced prepreg sheet 6 serving as a reinforcing member, and the photocurable fiber reinforced prepreg sheet 6 is bonded across the structural members, An example in which the photocurable fiber-reinforced prepreg sheet 6 is reinforced by photocuring is shown. The present invention is not limited to the joint portion (joint portion) of the pillar 1, the beam 2, and the brace 3 as the structural member, but can be applied to all joint portions of the respective structural members of the wooden structure.

  The photocurable fiber-reinforced prepreg sheet 6 as the reinforcing member is rich in flexibility, can be bonded regardless of the shape and position of various structural members, and can be easily bonded, and the photocurable fiber-reinforced prepreg sheet 6 Is an industrial product, the construction variation by the installer is suppressed, and after curing, uniform and high mechanical strength is expressed.

  In addition, the photocurable fiber-reinforced prepreg sheet 6 itself has adhesiveness and has a good adhesion performance with each structural member. However, when further improving the adhesion with each structural member and adhering the photocurable fiber-reinforced prepreg sheet 6, In order to facilitate the defoaming work of the air bubbles interposed between the photocurable fiber-reinforced prepreg sheet 6 and each structural member, a primer or an adhesive may be used.

  As shown in each figure, when the joint portion of each structural member of the wooden structure is reinforced with the photocurable fiber reinforced prepreg sheet 6, the photocurable fiber reinforced prepreg sheet 6 becomes the structural member of the wooden structure. There are provided an adhesive portion 6a to be bonded and a non-adhesive portion 6b to be a portion where the photocurable fiber-reinforced prepreg sheet 6 is not bonded to each structural member of the wooden structure. 1 (d) and 2 (c), the photocurable fiber-reinforced prepreg sheet 6 is folded and bonded to the front and back surfaces of the joint portion of each structural member of the wooden structure.

  The present invention reinforces the tensile resistance and shear resistance between the structural members of the wooden structure with the adhesive portion 6a of the photocurable fiber-reinforced prepreg sheet 6, and provides resistance to rotational moment due to the presence of the non-adhesive portion 6b. It can be greatly strengthened, i.e. it can be stiffened. In the conventional continuous fiber impregnation method, it is difficult to reinforce such a construction, and this is made possible by using the photocurable fiber-reinforced prepreg sheet 6 according to the present invention.

  FIG. 2 shows an example in which a photocurable fiber-reinforced prepreg sheet 6 is bonded and reinforced across a concrete base 4 and a base 5 which are structural members of a wooden structure. The photocurable fiber reinforced prepreg sheet 6 has good adhesion to general building materials such as concrete and steel as well as wood, and the photocurable fiber reinforced prepreg sheet 6 is rich in flexibility. It is possible to bond the photocurable fiber reinforced prepreg sheet 6 across the foundation 4 and the foundation 5 even if a step occurs in the foundation 5, and suppress and restrain the lifting phenomenon of the foundation 5 that occurs during an earthquake, This is a reinforcement method suitable for preventing collapse of a wooden structure.

  FIG. 3 shows an example in which a photocurable fiber reinforced prepreg sheet 6 is bonded or wound around various structural members of a wooden structure, and then the photocurable fiber reinforced prepreg sheet 6 is photocured to reinforce various structural members. It is. As described above, the photocurable fiber-reinforced prepreg sheet 6 is rich in flexibility, and can be easily wound around various structural members and improved in strength regardless of the shape.

  FIG. 4 is an example in which a plurality of photocurable fiber-reinforced prepreg sheets 6 are laid and laminated so that the reinforcing fiber directions are substantially orthogonal to each other. In FIG. 4, a unidirectional reinforcing fiber (roving material) type photocurable fiber reinforced prepreg sheet 6 is used and bonded in such a manner that the directions of the reinforcing fibers intersect at about 90 degrees. Of course, a photocurable fiber-reinforced prepreg sheet 6 using isotropic short fiber mat type reinforcing fibers may be laminated, and a plurality of photocurable fiber-reinforced prepreg sheets 6 may be laminated to the required strength. Is possible.

  The photocurable fiber reinforced prepreg sheet 6 used as the reinforcing member used in the present invention will be described. The photocurable fiber reinforced prepreg sheet 6 includes a photocurable resin composition, a thickening agent for thickening the photocurable resin, and reinforcing fibers such as glass fibers.

  A photocurable resin composition is defined as a composition that undergoes a polymerization reaction in response to the wavelength region of ultraviolet rays, visible rays, and near infrared rays. Specifically, a photocurable resin composition is used to apply light to a resin composition having an unsaturated bond as a main component. A polymerization initiator is added. Examples of the main component of the photocurable resin composition include unsaturated polyester resins, epoxy acrylate resins, urethane acrylate resins, allyl ester resins, and xylene resins. You may use these resin individually or in mixture of 2 or more types as appropriate.

  The main resin is used by mixing a liquid polymerizable monomer in consideration of the impregnation property of reinforcing fibers and the like, and the liquid polymerizable monomer is soluble and polymerizable with the main resin. In particular, for example, acrylic acid ester, methacrylic acid ester, aromatic vinyl compound and the like are preferably used, and when taking odor countermeasures for residents and / or contractors, methyl (meth) acrylate, ethyl (meth) acrylate Acrylic compound-based liquid polymerizable monomers such as are preferably used. The blending ratio of the liquid polymerizable monomer is preferably 10 parts by weight to 100 parts by weight, and more preferably 20 parts by weight to 60 parts by weight with respect to 100 parts by weight of the main resin.

  As the photopolymerization initiator, a known photopolymerization initiator having photosensitivity in a wavelength region from ultraviolet to near infrared can be used alone or in combination. From the viewpoint of the curing rate of the photocurable fiber-reinforced prepreg sheet 6, a photopolymerization initiator having photosensitivity in the ultraviolet region is preferably used. For example, the blending ratio of the photopolymerization initiator is preferably 0.05 to 15 parts by weight, more preferably 0.1 to 10 parts by weight with respect to 100 parts by weight of the main resin.

  Known additives may be added to the photocurable resin composition, specifically, polymerization inhibitors such as catechol and hydroquinone, flame retardants such as aluminum hydroxide and phosphorus compounds, glass particles, and the like. These fillers, curing shrinkage agents such as polyethylene, and the like may be added singly or in combination of two or more as long as the photocurability is not significantly impaired.

  The said thickener is not specifically limited, Metal oxides, such as magnesium oxide, metal hydroxides, such as magnesium hydroxide, an isocyanate compound, or a thermoplastic resin powder can be used. From the viewpoint of quality stability of the photocurable fiber-reinforced prepreg sheet 6, it is preferable to use a thermoplastic resin powder. The thermoplastic resin powder polymerizes a monomer composition containing 50% or more of at least one monomer selected from polymerizable monomers such as acrylic acid esters, methacrylic acid esters, and aromatic vinyl compounds. Can be obtained.

  The reinforcing fibers are not particularly limited, and inorganic fibers such as glass fibers and metal fibers, and organic fibers such as aramid, vinylon, and nylon fibers can be used. Further, the form is not particularly limited, and chopped strand mats, cloths, and roving fibers can be used. One type of reinforcing fiber may be used alone, or two or more types may be used in combination.

  The photocurable fiber-reinforced prepreg sheet 6 may be formed by laminating a resin film material on one or both sides of the sheet from the viewpoint of transportation and handling at the site. By laminating the resinous film material, it is possible to improve the curability of the surface of the photocurable fiber-reinforced prepreg sheet 6, improve the long-term quality stability of the photocurable fiber-reinforced prepreg sheet 6, and suppress odor. The material of the resinous film material is not particularly limited, and a general-purpose film material molded into a resin material such as polyethylene or polyester is used. Among them, a film made of polyethylene terephthalate and having a thickness of 20 μm to 60 μm is preferably used. More preferably, the protective film on the side to be bonded to the base material is subjected to release treatment with silicon resin or the like, and the protective film on the surface side of the photocurable fiber-reinforced prepreg sheet 6 is shielded from light in the wavelength region of the photopolymerization initiator. The coating process which has property is given.

  The bonding method of the photocurable fiber reinforced prepreg sheet 6 is very simple. After the photocurable fiber reinforced prepreg sheet 6 is bonded or wound around the reinforcing portion, it is irradiated by an irradiation device having the same wavelength region as that of sunlight or a photopolymerization initiator. Harden. The irradiation time is preferably 1 to 30 minutes, the curing time can be controlled by the output of the irradiation device and the amount of the photopolymerization initiator, and the vibration resistance of the joint is remarkably improved within a short time.

  Before adhering or winding the photocurable fiber reinforced prepreg sheet 6, a repair material for repairing a defect portion of various structural members, an improvement in adhesive strength, or air bubbles interposed between the various structural members and the photocurable fiber reinforced prepreg sheet 6 You may perform the primer for the removal work efficiency improvement, adhesive processing, etc. Moreover, you may adhere | attach using a nail together, such as peeling phenomenon prevention.

  After the photocurable fiber-reinforced prepreg sheet 6 is bonded, the sheet surface may be coated to prevent deterioration by ultraviolet rays or as a aesthetic (landscape) countermeasure.

  And the reinforcement structure of the wooden structure reinforced with the photocurable fiber reinforced prepreg sheet 6 used as a reinforcement member using the said reinforcement method of a wooden structure can be constructed | assembled.

  INDUSTRIAL APPLICABILITY The present invention is suitable for the seismic performance of the joint portion of each structural member of a wooden structure, the strength of each structural member, and the prevention of the foundation from lifting.

It is a front schematic diagram which shows a mode that the junction part of each structural member of a wooden structure was reinforced with the photocurable fiber reinforced prepreg sheet. It is a front schematic diagram which shows a mode that the photocurable fiber reinforced prepreg sheet was adhere | attached and reinforced across the foundation and the foundation. It is a front schematic diagram which shows a mode that the photocurable fiber reinforced prepreg sheet was wound around various structural members and reinforced. The front schematic diagram which shows a mode that the photocurable fiber reinforced prepreg sheet | seat was laminated | stacked and reinforced at the junction part or various structural members is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Column 2 ... Beam 3 ... Bracing 4 ... Foundation 5 ... Base 6 ... Photocurable fiber reinforced prepreg sheet 6a ... Adhesive part 6b ... Non-adhesive part

Claims (7)

In the method of reinforcing a wooden structure using a reinforcing member, a method for reinforcing a wooden structure is characterized in that a joint portion of each structural member of the wooden structure is reinforced using a photocurable fiber-reinforced prepreg sheet. At the joint portion of each structural member of the wooden structure, after the photocurable fiber-reinforced prepreg sheet is bonded across the structural members, the light-curable fiber-reinforced prepreg sheet is photocured to form the wooden structure. The method for reinforcing a wooden structure according to claim 1, wherein a joint portion of each structural member of the object is reinforced. The method for reinforcing a wooden structure according to claim 1 or 2, wherein the reinforcement of the joint portion of each structural member of the wooden structure is a rigid reinforcement that reinforces a resistance to a rotational moment. After bonding a photocurable fiber reinforced prepreg sheet across at least one structural member of a concrete base and a foundation, a pillar, a brace as a joint portion of each structural member of the wooden structure, The method for reinforcing a wooden structure according to claim 2, wherein the photocurable fiber-reinforced prepreg sheet is photocured. In the method of reinforcing a wooden structure using a reinforcing member, after the photocurable fiber-reinforced prepreg sheet is bonded or wound around each structural member of the wooden structure, the photocurable fiber-reinforced prepreg sheet is photocured. A method for reinforcing a wooden structure, comprising reinforcing each of the structural members. The method for reinforcing a wooden structure according to any one of claims 1 to 5, wherein the photocurable fiber-reinforced prepreg sheet is laminated so that the reinforcing fiber directions are substantially orthogonal to each other. A reinforcing structure for a wooden structure using a reinforcing member, wherein the reinforcing structure is reinforced using the reinforcing method for a wooden structure according to any one of claims 1 to 6.

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