JPH1054149A - Repairing method for wooden structural member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair a rotted wooden structural member while giving sufficient structural strength to it without giving conspicuous damage to the face side portion of a wooden structural building. SOLUTION: The peripheral edge section 4 of a rotted section 3 is cut off into a cover shape in the prescribed range by a cutter, an opening section 2 is formed on a wooden structural member 1, the rotted section 3 other than a healthy core section 5 at the cross sectional center in the wooden structural member 1 is scraped and removed from the opening section 2, and the wood surface around the rotted section 3 is coated with a primer. A fiber sheet 7 is stuck to the wood surface, an integrated plate-like reinforcing material 8 is stuck via an adhesive, and a belt-like reinforcing material 12 is inserted into the remaining slender gap. An adhesive is filled and hardened in the void around the belt-like reinforcing material 12, and the peripheral edge section 4 cut into the cover shape is fitted and stuck to the opening section 2 at the original position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reinforcing wooden structural members, and more particularly to a method for repairing and preserving damaged parts of a wooden structure designated as a cultural property or the like. The present invention relates to a method for repairing a member.

[0002]

2. Description of the Related Art Conventionally, work has been carried out to repair damaged parts of a building in order to preserve a valuable wooden structure designated as a cultural property for a long period of time. When repairing wooden structural members such as decayed pillars and beams, generally, the decayed parts of the members are cut out from the outside of the timber and then removed, and reinforcing materials such as timber are joined to the removed parts. It is repaired by adding.

[0003]

However, in such a conventional method for repairing a member for a wooden structure, only a suitable piece of wood or the like is added to the cutout portion of the member for a wooden structure. However, there is a problem that a wooden structure which has not been provided with sufficient structural strength.

Further, even when the peripheral portion of the wooden structural member is not decayed, the peripheral portion is removed together with the decayed interior, and the reinforcing material is added to that position,
The repaired parts are clearly exposed, and there is a problem that it is not preferable in terms of appearance for preserving the buildings, particularly in the case of a wooden structure designated as a cultural property or the like.

Accordingly, the present invention has been made in view of the above-mentioned unsolved problems, and provides sufficient structural strength to a decayed wooden structural member, and furthermore, a visible portion of a wooden structural building. It is an object of the present invention to provide a method for repairing a wooden structural member that can be repaired without causing noticeable damage to the wooden structure.

[0006]

In order to solve the above-mentioned problems, an invention according to claim 1 is a method for repairing a member for a wooden structure whose inside is decayed and whose peripheral portion is sound. A part of a healthy peripheral portion of the wooden structural member is cut into a lid with a predetermined thickness, and a decayed portion inside the wooden structural member is cut out therefrom to form a hollow portion, and a sound around the hollow portion is formed. After applying the primer to the natural wood surface, a plate-like reinforcing material made of plywood is arranged according to the size of the hollow portion and joined to the healthy wood surface, and then the peripheral edge portion cut into a lid shape is removed. A method for repairing a wooden structural member, which is attached to an original position, is provided.

[0007] With this, a part of a healthy peripheral part around the decayed part is cut into a lid shape, and an opening is formed in the wooden structural member, thereby removing the decayed part and repairing a cavity formed therein. When the work is completed, a part of the peripheral portion is fitted into the original position in a lid shape and attached, thereby removing only the internal decayed portion without clearly exposing the damaged portion of the wooden structural member.

The decayed portions of the wooden structural members such as pillars and beams are removed by hollowing out, and the resulting wood surface around the space is coated with a primer such as a resin primer (PVA) as a base material. After that, the adhesion of the wood surface is increased, and one or more plate-like reinforcing materials having high rigidity are cut out into a shape suitable for the internal space and manufactured, and are adhered and integrated with a sound wood surface.

Further, the invention according to claim 2 is such that the inside rots
And a method for repairing a healthy wooden structural member having a peripheral portion, in which a part of the healthy peripheral portion of the wooden structural member is cut into a lid shape with a predetermined thickness, and the inside of the wooden structural member is cut therefrom. The decayed part is hollowed out to form a cavity, a primer is applied to a healthy wood surface around the cavity, and a band-shaped reinforcement made of an elongated veneer is inserted into the cavity. A method for repairing a wooden structural member, characterized in that a resin material is filled in a remaining space around the resin material and the resin material is cured, and thereafter, a peripheral portion cut into a lid shape is attached to an original position.

Accordingly, when the space from which the decayed portion is removed is small and the rigidity of the remaining wood is secured, etc., a flexible elongated strip-shaped reinforcing material is provided in the gap around the decayed portion in a healthy manner. By inserting an adhesive such as a phenolic resin adhesive into the gap between the strip-shaped reinforcing material and the surrounding wood and hardening it together, it is inserted along the unevenness on the surface of the wood, so that there is no gap inside the wooden structural member. An integral rigidity is formed.

The invention according to claim 1 or 2 can of course be carried out independently, but after the plate-like reinforcing material is arranged, the band-like reinforcing material is inserted into the remaining voids to form the resin material. As in the case of filling, the invention also includes a case where these inventions are used in combination.

Further, the invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, a fiber sheet is attached to the surface of the wood around the removed decayed portion, so that the fiber sheet is adhered to the surface of the wood. Then, a fiber sheet such as an FRP material is stuck, and the reinforcing material disposed in the cavity is integrally restrained.

According to a fourth aspect of the present invention, in the method for repairing a wooden structural member according to the second aspect, the reinforcing member and the peripheral edge portion are penetrated by a hairpin and fixed to the healthy wood to thereby improve the interior. The plate-shaped reinforcing member inserted into the peripheral portion and the peripheral portion are firmly fixed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for repairing a wooden structural member according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a wooden structural member constituting a frame of a wooden structural building. Here, the wooden structural member 1 is a large beam, and one side of the cross section is about 45 to 50 cm. , And the member length is about 8 m. In addition, this wooden structure member 1 is pine here. In addition, the wood structural member 1 is not decayed up to about 5 cm at the periphery because the smoke from the hearth used in the building has penetrated, and therefore only the inside is decayed. I have.

First, the decayed portion 3 inside the wooden structure member 1 is detected by hitting it with a hammer or the like from the outer surface to check the tone. Then, an opening 2 is formed in the wooden structure member 1 by cutting the detected peripheral edge 4 of the decayed part 3 into a lid in a predetermined range using a cutter or the like.

Next, the wooden structure member 1 is inserted through the opening 2.
The decayed part 3 other than the sound core 5 at the center of the inner cross section is cut out and removed, and as shown in FIG. 2, the wood surface 6 around the cavity formed by the removal of the decayed part 3 is reinforced. Apply a primer to increase the adhesion to the material. In addition,
Here, a resin primer (PVA) is applied to this primer.

Next, a fiber sheet 7 is adhered to a healthy wood surface 6 on the periphery where the resin primer is applied. At this time, both ends of the fiber sheet 7 are left by the area of the cut edge of the lid. Here, the fiber sheet 7 uses FRP (glass fiber reinforced plastic) in which glass fiber is impregnated with a polyester resin.

A plate-like reinforcing material 8 made of plywood is attached along the surface of the wood to which the fiber sheet 7 is attached. Here, the plate-like reinforcing member 8 is a high-strength plywood classified as a special class of structural plywood class 1. A plurality of single members made of Douglas fir of the same system as the material of the wooden structural member 1 are drawn in the fiber direction. A layer which is alternately laminated and integrated with a phenol resin adhesive is applied.

Next, the plurality of plate-like reinforcing members 8 are cut into a shape suitable for the hollow portion, are arranged and arranged at predetermined positions inside, and are joined to a healthy wood surface of the peripheral portion by an adhesive. As shown in FIG. 3, a hairpin 11 is inserted into a notch 9 formed in each plate-shaped reinforcing member 8 and a receiving portion 10 formed on an inner peripheral surface of a peripheral portion thereof so as to be orthogonal to the axial direction of the wooden structural member. By inserting, the plate-shaped reinforcing member 8 and the wooden structural member 1 are fixed to each other.

In this case, the notch 9 is formed in the plate-like reinforcing member 8, but in addition to this, a through-hole is formed in the plate-like reinforcing member 8, and the hairpin 11 is inserted into the through-hole and fixed. Can also. After arranging the plurality of plate-like reinforcing members 8 in this manner, the band-like reinforcing members 12 made of a thin plate-like single plate having a flat cross section are arranged in the remaining elongated space. The band-shaped reinforcing member 12 is made more flexible by cutting a veneer constituting a plywood applied to the plate-shaped reinforcing member 8 into an elongated flat shape. A plurality of belt-like reinforcing members 12 inserted in the axial direction of the structural member 1 and filled with an adhesive 13 such as phenol resin in the remaining space around the belt-like reinforcing members 12 and healthy wood are mutually interlocked. Cured integrally.

In this embodiment, the belt-like reinforcing members 12 are arranged in the same direction, but the fiber directions of the respective belt-like reinforcing members 12 are arranged vertically and horizontally so that the fiber directions are perpendicular to each other. You can also.

Next, when the adhesive 13 is hardened and integrated with the wooden structural member 1, the repaired upper surface of the opening 2 is covered with a surplus portion of the fiber sheet 7 to cover the adhesive 13. Is applied, and the peripheral portion 4 cut into a lid shape is fitted into and adhered to the opening 2 which is the original position.

The wooden structural member 1 thus repaired.
The stiffness of the wooden structural member 1 is increased by placing a plate-like reinforcing material 8 having sufficient bending and compressive strength in the space from which the decayed portion 3 is removed, and furthermore, a band-like reinforcing material is provided in the remaining gap. By inserting the resin material 12 and filling it with a resin material without a gap, the resin material is integrated to suppress deformation and depression of the wooden structure member 1.

Further, the fiber sheet 7 is adhered to the entire remaining peripheral portion around the cavity formed by removing the decayed portion 3, thereby preventing the occurrence of cracks and the like at the peripheral portion and disposing the fiber sheet 7 inside. Reinforced material can be firmly restrained.

After the opening 2 is formed by cutting off the peripheral portion around the decayed portion 3, it is attached to the original position in a lid shape after the repair is completed. This makes it possible to strengthen only the decay portion 3 inside the wooden structure member 1 without exposing the appearance.

In order to check the bending strength of the reinforced wooden structural member 1, both ends of the wooden structural member 1 are supported, and a center between the both ends and three places on both sides thereof are respectively viewed from above. As a result of performing a loading test by applying a load of 250 kgf, it was confirmed that the wooden structure member 1 had sufficient bending strength without causing problems such as cracks and breakage.

Further, as shown in FIG. 4, as a result of measuring a pull-out resistance (a nail-holding force) by driving an iron round nail at a right angle from the outer surface of the wooden structural member 1, as shown in FIG. The force was less than 40kgf / piece,
At the repair site, the distribution is 40 kgf / piece to 100 kgf / piece, and thus it was confirmed that sufficient joining strength was obtained when joining the wooden structural member 1 to another structural member.

In this embodiment, a case has been described in which the plate-like reinforcing member 8 is arranged in the space from which the rotting portion 3 has been removed, and then the band-like reinforcing member 12 is inserted into the remaining gap. When the rotting portion 3 of the member 1 is small or the like, it is also possible to insert only the belt-like reinforcing material 12 and to fill and reinforce it with a resin material. When the plate-like reinforcing member 8 can be arranged in the space from which the rotting portion 3 has been removed without any gap, the wooden structural member 1 is reinforced only by the plate-like reinforcing member 8 without inserting the band-like reinforcing member 12. Of course you can.

Further, in this embodiment, the case where high-strength plywood of structural specialty class 1 is used as the plywood to be used has been described, but another type of structural plywood or ordinary plywood is used. You can also.

Although the case where a phenol resin adhesive excellent in adhesive strength and durability is applied to the adhesive has been described here, other than this, a resorcinol resin, an epoxy resin, a polyester resin, a urea resin, a melamine resin Any adhesive such as alkyd resin can be used.

Further, in this embodiment, the case where FRP (glass fiber reinforced plastic) is applied to the fiber sheet 7 has been described.
F), a fiber sheet 7 reinforced with aramid fiber (AF) or the like can also be used.

Further, in this embodiment, the case where the present invention is applied to the girder as the wooden structure member 1 has been described. However, the present invention is not limited to this, and may be applied to any place such as a pillar or a base. Of course you can.

[0034]

As described above, according to the first aspect of the present invention, a part of a healthy peripheral part around the rotting part is cut off, and after the repair is completed, a part of the peripheral part is returned to the original position. By fitting and attaching in a shape, the wooden structure can be repaired without exposing the damaged portion to the visible portion of the wooden structural member as in the related art.

Further, by providing a plate-like reinforcing material in a space from which the decayed portion inside the wooden structure member has been removed, the decayed portion having reduced rigidity can be strengthened and the structural strength of the wooden structure member can be increased. .

According to the second aspect of the present invention, a band-shaped reinforcing material is inserted into a gap around the decayed portion, and an adhesive is filled and hardened into a gap between the band-shaped reinforcing material and surrounding wood. In addition, it is possible to prevent cracks, depressions, and the like from occurring in the wooden structural member, thereby improving the durability of the wooden structural member.

According to the third aspect of the present invention, by attaching a fiber sheet to the surface of the wood around the decayed part, the decayed part is removed, the remaining wood is reinforced, and the reinforcing material disposed in the space is integrally formed. To increase structural strength.

According to the fourth aspect of the present invention, by penetrating the plate-like reinforcing member with a hairpin, it can be firmly integrated with the wooden structural member.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a procedure for repairing a wooden structural member according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a repair procedure of a wooden structural member, which is cut along a rotting part in FIG. 1;

FIG. 3 is a sectional view of a member for a wooden structure.

FIG. 4 is a graph showing a distribution of a pull-out resistance of a nail with respect to a surface moisture content of a wooden structural member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Wood structural member 2 ... Opening part 3 ... Decay part 4 ... Peripheral part 5 ... Core part 6 ... Wood surface 7 ... Fiber sheet 8 ... Plate-shaped reinforcing material 9 ... Notch 10 ... Receiving part 11... Hairpin 12...

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Maesawa 1-42-5 Ohara, Setagaya-ku, Tokyo (72) Inventor Kiyoshi Nitta 34-2 Chigusa-cho, Hanamigawa-ku, Chiba-shi, Chiba

Claims (4)

[Claims] 1. A method for repairing a wooden structural member whose interior is decayed and whose peripheral edge is sound, wherein a part of the healthy peripheral edge of the wooden structural member is cut into a lid shape with a predetermined thickness. A hollow portion is formed by hollowing out the decayed portion inside the wooden structure member, a primer is applied to a healthy wood surface around the hollow portion, and a plate-like reinforcing material made of plywood is removed from the hollow portion. A method for repairing a member for a wooden structure, which is arranged in accordance with the size of a wooden structure, is joined to the sound surface of the wood, and then the lid-cut peripheral edge is attached to an original position. 2. A method for repairing a wooden structural member whose inside is decayed and whose peripheral edge is sound, wherein a part of the healthy peripheral edge of the wooden structural member is cut into a lid shape with a predetermined thickness. Then, the decayed portion inside the wooden structural member is removed therefrom to form a hollow portion, and a primer is applied to a healthy wood surface around the hollow portion. And a resin material is filled into the remaining space around the belt-shaped reinforcing material and cured, and then the lid-cut peripheral portion is attached to the original position. Repair method. 3. The method for repairing a wooden structure member according to claim 1, wherein a fiber sheet is attached to a surface of the wood around the removed decayed part. Method. 4. The method for repairing a wooden structure member according to claim 1, wherein the plate-like reinforcing material is penetrated by a hairpin and fixed to the healthy wood. .