JP5162036B2 - Strengthening structure of wooden building - Google Patents

Description

The present invention is tightly coupled with the steel structure pillar and the steel plate that straddles the foundation and girders, prevents damage to the column end due to the large horizontal shear stress acting on the working surface due to the tsunami acting stress, and column hozo destruction, and works vertically The present invention relates to a structure for strengthening the strength of a wooden building capable of structural calculation that transmits pulling stress to upper and lower floors and foundations.

  Tightening to secure the initial rigidity by tightening the molded continuous fiber sheet bonded to the steel plate with a tensioning tool when tightening the wooden part with long screws by reinforcing the structure of each floor and foundation and horizontal member with wooden structure About.

Many houses were destroyed by the collapse of the earthquake and tsunami in the Great Tohoku Earthquake that occurred last year and lost their precious lives. Wooden buildings to the tsunami with several times the destructive force of the earthquake, was not in the Building Standard Law.

A law was enforced in December last year to deal with urgent matters (Non-Patent Document 1), and additional knowledge on the design method of buildings that are safe in terms of structural strength was announced against the tsunami. I did it.
Buildings that can withstand tsunamis require structural strength twice to three times that of an earthquake.
We also found that a basic anchor system that prevents corrosion due to salt damage is necessary for durability.

  There is an urgent need to improve the earthquake resistance of tsunamis and existing wooden structures to improve the tsunami resistance.

Reduce damage to wooden buildings caused by tsunami stress, which has not been studied in the past, and facilitate earthquake-resistant repair of structures that can withstand tsunami.

Conventionally, the pull-out allowable strength of hole-down hardware that connects a high-strength bearing wall (for example, Patent Document 1) and the foundation was satisfactory with a combination of 25KN or less. (For example, Patent Documents 2, 3, 4, and 5)
  However, the maximum wall strength is 9.8KN to 14.7KN or more according to the tsunami standard, and the pulling strength with the upper floor is required to be equivalent to 50KN.

The horizontal force on the upper part of the building becomes a vertical load and is transmitted as the pulling stress or compressive stress of the foundation. A fixing force to the foundation that can withstand tensile stress is required.
The continuous fiber sheet is directly fixed to the concrete inside the foundation (see, for example, Patent Document 2). In this example, the construction accuracy is not achieved, and it is difficult to secure the fixing strength necessary for pulling out.

As a countermeasure against salt damage, conventional round steel anchor bolts have a low anchorage strength to concrete, so the round steel must be thickened. If it is thick, the necessary width of the wood will be large. All wood width increases, the volume increases and the price increases.

In seismic retrofits that enhance seismic resistance, it is necessary to integrate existing foundations and additional tie-up foundations with additional reinforcement of anchor bolts and new reinforcement of reinforcing bars to ensure bending strength of existing wooden buildings. (For example, see Non-Patent Document 2)

With the roughening of the joint surface of the existing foundation, anchor bars and anchor bolts, the existing concrete foundation is cracked, and it is not possible to expect much reinforcement.

In addition, the seismic retrofits require floor reinforcement on each floor to ensure the horizontal strength of existing wooden buildings. The beams that support the floor are greatly deflected over time, and the bending strength is reduced due to cracks and fiber breaks, so the beams must be replaced.
To replace the beam, the floor must be dismantled once, which requires a lot of labor and cost.

When bonding a continuous fiber sheet to a wood part, it is necessary to press the entire bonding surface immediately after the base treatment and adhesive application, but since the pressing is not performed only by defoaming, there is an accident that peels off after construction. It occurs frequently.
According to the adhesion mechanism of this patent, the adhesive enters the inside and outside of the wood into a wedge shape and is united with the wood fiber and bonded. For example, Non-Patent Document 3 describes that the pressing requires about 0.7 N square mm.
On the other hand, the adhesion mechanism is different from that of minerals of iron and concrete.

The tension of the continuous fiber sheet is a large amount of reinforced concrete as shown in Patent Document 6, for example.

In addition, the tension of the continuous fiber sheet is, for example, tight binding in which an adhesive is applied to wood as shown in Patent Documents 5 and 6, and as described above, it has only a low tensile strength.

There is no structural specification corresponding to the standards of wooden buildings that can withstand the new tsunami and construction methods established by the Minister of Land, Infrastructure, Transport and Tourism, and performance can only be confirmed by structural calculations based on the Building Standards Act and various structural calculation standards of the Architectural Institute of Japan.

JP-A-2005-207204 JP-A-2004-238901 (FIGS. 15 and 16) JP 2002-317492 A JP2009-221780 JP-A-10-002021 Japanese Patent Laid-Open No. 11-182061 (FIG. 22)

Law No. 123 (Act on Tsunami Disaster Prevention Community Development), Article 31 No. 1 and No. 2 (Ministry of Land, Infrastructure, Transport and Tourism Notification No. 1318) Japan Architectural Disaster Prevention Association, page 88-91 Architectural Institute of Japan, Wood Structure Design Standards / Comment 2006, page 315

Accordingly, an object of the present invention is to provide a strength strengthening structure for a wooden building that can withstand a tsunami that requires the strength of a high-strength wooden building and prevent deterioration of the earthquake resistance due to repeated high seismic intensity .

Another object of the present invention is to ensure the performance of new buildings and seismic retrofits for wooden structures that are more than the current maximum earthquake resistance class 3 (1.5 times the Building Standards Act) in the structural calculation, and the structural calculation of the Building Standards Act. An object of the present invention is to provide a structure for strengthening the strength of a wooden building that enables construction that can be performed.

In the present invention , the wooden structure pillar is tightly coupled with the steel plate provided across the base and girders to prevent damage to the column end due to the large horizontal shearing stress acting on the working surface due to the tsunami acting stress and column hozo breakage. The working pulling stress is transmitted to each floor and foundation.

In the present invention without the construction site adhesion uncertain xylem performance, characterized by a clear construction of the strength that the shear strength and pull-out strength and the ultimate mode by long screws without choosing a builder.

Further, in the present invention, Tightened in structural materials such as beams, pillars and underlying wooden structure, the wood structural design criteria at the junction to withstand tensile stress acting on the joint portion of the respective molded continuous fiber sheet is bonded to the steel plate gusset It is characterized by being able to calculate the effect on aptitude and accurately evaluate it.

Furthermore, the embodiment of the present invention is characterized by an anchor plate in which a steel plate for the purpose of fixing concrete inside the foundation and a molded continuous fiber sheet are bonded.

In addition, the embodiment of the present invention is characterized in that the bending plate shear strength is secured and the strength of the existing foundation is maintained by installing the anchor plate on the additional foundation by the seismic modification of the foundation.

Furthermore the installation of the anchor plate in the embodiment of the present invention (FIG. 2 (A) ~ FIG 2 (B)), characterized in that it is possible to structure the calculation of the required pulling strength in dimensional change.

By the way, in the beams of the wooden earthquake-resistant repair, wood deflected in aging is cracking and twisting many adhesive force can not be expected. It is necessary to pull the molded continuous fiber sheet to correct bending down greatly due to insufficient cross section (see, for example, Patent Document 5). Torque from 0.5KN to 1.0KN is applied for tightening with bolt screw.
Therefore, the embodiment of the present invention is characterized by a steel plate gusset having a tension hole of about 60 mm for removing the slack of the molded continuous fiber sheet.

Further, in the embodiment of the present invention , the formed continuous fiber sheet is tensioned by moving the steel plate plate to which the formed continuous fiber sheet is bonded by rotating the eccentric shaft fixed with the lug bolt by installing in the hole of about 60 mm. It is characterized by the presence of a tension tool.

The bending of the molded continuous fiber sheet In an embodiment of the present invention is characterized in capable molded.

According to the present invention, it is possible to obtain a wooden building that is highly resistant and safe against tsunamis and earthquakes .

Moreover, according to this invention, the safe wooden building which can be evaluated correctly by earthquake-proof repair can be obtained .

FIG. 1A is a front view according to Embodiment 1, in which a steel plate is fastened across a pillar and a base or a beam. FIG. 1B is a vertical sectional view according to Embodiment 1, in which a steel plate is fastened across a pillar and a base or a beam. FIG. 2A is a front view according to the second embodiment, in which the steel plate plate of the first embodiment and the anchor plate inside the foundation are bonded to each other with a molded continuous fiber sheet and fixed to the foundation rebar. FIG. 2 (B) is a vertical sectional view according to the second embodiment, in which the steel plate plate of the first embodiment and the anchor plate inside the foundation are bonded with a molded continuous fiber sheet and fixed to the foundation rebar. FIG. 2C is a vertical cross-sectional view according to the second embodiment, in which the steel plate plate of the first embodiment and the anchor plate inside the foundation are bonded to each other with a molded continuous fiber sheet and fixed to the foundation rebar. FIG. 3 is a front view according to the third embodiment, in which the steel plate plate of the first embodiment of the load bearing wall is bonded to the molded continuous fiber sheet with an adhesive with a pressing plate, and is bonded to a wooden structure. FIG. 4 is a perspective view according to the fourth embodiment. FIG. 5 shows a perspective view according to the fifth embodiment. FIG. 6 shows a perspective view of a new foundation according to the sixth embodiment. 7A is a plan view of a tensioning tool having a rotating lever welded to a circular steel plate according to Embodiment 6, and FIG. 7B is a diagram of a steel plate having a tensioning hole according to Embodiment 6. FIG. It is an enlarged plan view. FIG. 8A shows a state in which the lag screw is fixed to the circular steel plate having a tension hole according to the sixth embodiment, and FIG. 8B is a plan view showing a state in which the steel plate has moved to the tension position. It is. FIG. 9 shows a perspective view of an earthquake-proof repair foundation according to a modification of the sixth embodiment. FIG. 10 is a front view according to the seventh embodiment, and the formed continuous fiber sheet bonded to the steel plate of the first embodiment of the seismic retrofit is tensioned with the steel plate having the tension holes and bonded with the pressing plate. Tied with wooden structure. FIG. 11 shows a perspective view of beam reinforcement for seismic retrofit according to the eighth embodiment. FIG. 12 shows a perspective view of a bent form of the continuous continuous fiber according to the ninth embodiment. FIG. 13 is a front view showing a reinforcing member and a reinforcing structure of a high strength bearing wall of Patent Document 1. FIG. 14A is a perspective view showing a joint reinforcing material and a joint reinforcing structure using the fiber sheet of Patent Document 2. FIG. FIG. 14B is a side sectional view of FIG. FIG. 15 is a perspective view showing a state in which the fiber sheet of Patent Document 2 is embedded in the foundation. FIG. 16 is a perspective view showing a state in which the rope-like fiber sheet of Patent Document 2 is attached to a building member and embedded in the foundation. FIG. 17A is a perspective view showing a joint reinforcing member of Patent Document 3. FIG. FIG. 17B is a perspective view showing a state in which the joining reinforcement member of Patent Document 3 is attached to the building member. FIG. 18A is a front view showing a state in which the joining reinforcement member of Patent Document 4 is attached to a building member. FIG. 18B is a vertical cross-sectional view showing a state in which the joining reinforcement member of Patent Document 4 is attached to the building member. FIG. 19 is a perspective view showing the joint reinforcing member of Patent Document 5. 20 (a) and 20 (b) are side views showing a fiber sheet bonding reinforcing material member and a reinforcing method of Patent Document 6. FIG. FIG. 20C is a plan view showing the fiber sheet bonding reinforcing member and the reinforcing method of Patent Document 6. FIG. FIG. 20 (d) is a perspective view showing a fiber sheet bonding reinforcement member of Patent Document 6. FIG. 21 (a) and 21 (b) are side views showing a fiber sheet bonding reinforcement member of Patent Document 6. FIG. FIG. 22A is a front view showing the fiber sheet tension member of Patent Document 6. FIG. FIG. 22B is a side view showing the fiber sheet tension member of Patent Document 6. FIG .

Hereinafter, the embodiments of the present invention will be described with reference to FIGS. 1 to 12.

<Embodiment 1>

In the first embodiment shown in FIGS. 1A and 1B, the steel plate 10a is provided across the pillar 51 of the wooden structure 50 from the base 52 and the beam 53, and the long screw 13 is not shown in this figure. From this, the column structure 54 is tightly coupled to the wooden structure 50 to protect the horizontal column 54 from the horizontal shearing stress .

<Embodiment 2>

2A to 2C show a front view and the like according to the second embodiment. Among these, Embodiment 2 (A) has shown the front view. In the second embodiment, after the continuous continuous fiber sheet 20b, which is bonded to the steel plate anchor plate 40 with an adhesive (FIG. 2 (B)), to the steel plate 10a described in the first embodiment, is arranged on the basic reinforcing bar 62. The L-shaped bolt (not shown) is fixed to the horizontal bar 61 with the nut 43.
After the upper building, the steel plate 10a described in the first embodiment is coated with the adhesive 15 on the molded continuous fiber sheet 20b with the adhesive 15 and is fastened with the long screw 33 from the pressing plate 30.
When tension is required for the molded continuous fiber sheet 20b, the adhesive 15 is applied to the tension steel plate 10a, and the molded continuous fiber sheet 20b is pressed with an installation screw and cured. After hardening, the steel plate 10a is temporarily fixed, the formed continuous fiber sheet 20b is tensioned with a tensioning tool used in Embodiment 6 described later, and the curing of the compression plate 30 (see curing 36 in the embodiment described later) .) Is peeled off, and the adhesive 35 is applied, and the wood structure 50 is bonded.

FIG. 2B is a vertical sectional view according to the second embodiment. Note that the adhesive 35 is applied, and after tightening to the wooden structure 50, the above-described tender is removed.

FIG. 2C is a vertical sectional view according to the second embodiment. The continuous reinforcing steel sheet 20b bonded to the steel plate 10a and the steel plate anchor plate 40 according to the first embodiment with the adhesive 35 is attached to the reinforcing bar on the extension base of the seismic retrofit. The foundation 60 is completed by fixing with a nut (not shown) and placing foundation concrete.
The subsequent steps are the same as described above.

<Embodiment 3>

FIG. 3 is a front view according to the third embodiment. An adhesive (not shown) is applied to the steel plate (not shown) of the first embodiment of the high strength bearing wall, and the pressing plate 30 is cured (not shown) on the molded continuous fiber sheet 20b. The adhesive 35 is applied, and the wood structure 50 is fastened with a long screw (not shown).

<Embodiment 4>

FIG. 4 shows details of a perspective view according to the fourth embodiment.
A screw hole (not shown) is formed in the steel plate 10a to be fastened to the wooden structure 50 with the long screw 13.
Similarly, a screw hole (not shown) of a long screw 33 for fastening the pressing plate is formed.
The steel sheet plate 10a is degreased at the factory and has a curing sheet 16 stretched thereon.
The curing sheet 16 is peeled off and the adhesive 15 is applied.
A molded continuous fiber sheet or a molded continuous fiber sheet 20b (not shown) is stretched, and an adhesive 35 is applied thereon. A curing sheet 36 is stretched on the pressing plate 30 after degreasing at the factory.
The curing sheet 36 is peeled off, and the long screw holes 32 of the pressure plate 30 are pressed and fastened to the wooden structure 50 with the long screws 33.

<Embodiment 5>

FIG. 5 shows details of a perspective view according to the fifth embodiment.
The steel plate anchor plate 40 is bonded to a molded continuous fiber sheet (not shown) at the factory to form a molded continuous fiber sheet 20b.
The steel plate anchor plate 40 is fastened and fixed with a nut 43 with an L-shaped bolt 42 to a horizontal bar 61 that is bound to the vertical bar 62 of the base 60 according to the size, and the base is completed.
The steel plate 10c shown in FIGS. 4 and 5 is formed with screw holes (not shown) that are fastened to the wooden structure 50 with the long screws 13. Similarly, a screw hole 12 (FIG. 4) of a long screw 33 for fastening the pressing plate is drilled.
The adhesive surface of the steel plate 10c is degreased at a factory, and a curing sheet 16 is stretched.
The curing sheet 16 is peeled off and the adhesive 15 is applied.
The molded continuous fiber sheet 20b is stretched and the adhesive 35 is applied thereon. A curing sheet 36 is stretched on the pressing plate 30 after degreasing at the factory.
The curing sheet 36 is peeled off, and the long screw holes 32 of the pressure plate 30 are pressed and fastened to the wooden structure 50 with the long screws 33.

<Embodiment 6>

FIG. 6 shows a perspective view of the new foundation according to the sixth embodiment.
The subsequent steps are the same as those described in the fifth embodiment in FIG. 5 except that the pressing plate 30 is used for the wooden structure 50 instead of the base 52 in the fifth embodiment.

FIG. 7 shows a tensioning tool having a rotating lever (FIG. A) welded to a circular steel plate in Embodiment 6 and a steel plate having a tension hole (FIG. B). FIG. 8 shows a state in which the tension tool is fixed to a steel plate having a tension hole with a lag screw (FIG. A) and a state in which the tension tool is moved to a tension position (B in FIG. 8). The sixth embodiment will be described with reference to FIGS.

A wood cone diameter 9 mm is drilled under the beam 72a (FIG. 7) at a specified position deviating from the center of the tension hole of the steel plate 10a, and the tensioner 70 is fixed to the bore 72a with a lag screw 72b. As shown in FIG. 8, the tension lever rotating lever 73 is rotated 90 degrees to the left to tension the formed continuous fiber sheet 20c. The steel plate 10a is fixed under the beam with a long screw (see the long screw 13 shown in FIG. 2). The tension tool and the installation screw are taken, an adhesive is applied to the bent portion of the molded continuous fiber sheet 20c, and a small pressing plate is fastened under the beam with the long screw described above.

FIG. 7B is an enlarged view of a steel plate 10a having a tension hole according to the sixth embodiment.
A rotation shaft hole 72a having a hole diameter of 13 mm is provided at a position deviated from the center of the hole.
Also, a temporary fixing hole 74 having a hole diameter of 13 mm is provided.

As shown in FIG. 8A, the circular steel plate 71 fixed by the lag screw 72b to the steel plate 10a having the tension hole according to the sixth embodiment is rotated to the left to rotate the rotary lever 73 to the left in FIG. Transition to the state shown in B), the steel plate 10a moves upward and produces a tension effect.

As shown in FIG. 7A, the tensioning device 70 according to the sixth embodiment (A in FIG. 7) is composed of a shaft plate 72 that supports a rotating lever 73 welded to a circular steel plate 71. The shaft plate 72 has a hole 72 a as a shaft hole that is offset from the center of the circular steel plate 71.

<Modification of Embodiment 6>

FIG. 9 is a perspective view of an earthquake-proof repair foundation according to a modification of the sixth embodiment.
Except that a new part is added to the existing part of the foundation 60, the description is the same as the sixth embodiment of FIG.

<Embodiment 7>

FIG. 10 is a front view according to the seventh embodiment. When tension is required for the molded continuous fiber sheet 20b bonded to the steel plate 10a according to the first embodiment of the earthquake-proofing repair with an adhesive (not shown), the tension steel plate 10b is tied to the wooden structure 50 with a long screw. A steel plate 10b having a tension hole is temporarily fixed to a column. Then, the molded continuous fiber sheet 20b is tensioned with the tensioning device 70 described in FIG. 7 of the sixth embodiment, and the curing sheet (see the curing sheet 36 shown in FIGS. 4 and 5) of the pressing plate 30 is peeled off and bonded. After applying the agent 35 and binding to the wooden structure 50, the tendon 70 is removed.

<Eighth embodiment>

FIG. 11 shows a perspective view of beam reinforcement for seismic retrofit according to the eighth embodiment. A molded continuous fiber sheet 20c bonded to a steel plate 10b having a tension hole manufactured at a factory is temporarily fixed under the beam, and jacked up to the extent that the beam is flattened by an erection column or support at the center of the beam.

<Embodiment 9>

FIG. 12 is a perspective view of a bent form of the molded continuous fiber sheet 20c according to the ninth embodiment. The steel plate 10b having a tension hole and the molded continuous fiber sheet 20c are integrally bent.

10a Steel gusset plate with on-site bonding
10b Steel plate gusset plate with tension holes
10c Factory-bonded steel sheet gusset plate
12 Drilling of screws for steel sheet gusset
13 Long screws for fastening steel gussets and structural materials
15 Adhesive between steel sheet gusset and molded continuous fiber sheet
16 Steel sheet gusset and curing sheet
20a Molded continuous fiber sheet (on-site adhesion)
20b Molded continuous fiber sheet (factory and site bonding)
20c Molded continuous fiber sheet (factory bonding)
30 Pressure plate
32 Screw plate drilling
33 Long screw for fastening plate and structure
35 Adhesive between pressing plate and molded continuous fiber sheet
36 Curing sheet for pressure plate
40 Anchor plate
42 L bolts to fix the anchor plate to the foundation rebar
43 Nuts to fix the anchor plate to the foundation rebar
45 Adhesive between anchor plate and molded continuous fiber sheet
50 Wooden structure (driving body)
51 pillars
52 foundation
53 beams and girders
54 Column
60 Basics
61 Transverse muscle
62 Foundation rebar
70 Tensioner
71 round steel plate
72 axis plate
72a Shaft hole 72
72b lag screw
73 Rotating lever
74 Temporary fixing hole

Claims (5)

A flat plate-shaped first steel plate to be fixed to the foundation of a wooden building to be strengthened;
A tension hole having a circular shape with a diameter of 60 mm is drilled, and a surface parallel to the first steel plate is in the vicinity of the lower end portion of the wooden building body in which the lower end surface is placed on the upper surface of the foundation. A flat plate-shaped second steel plate to be fixed to one side surface,
A circular steel plate having a circular shape with a perforation at a predetermined position which is 54 mm in diameter and eccentric from its central position by 3.6 mm;
A flexible fiber sheet having a belt-like shape for fixing the lower end or the upper end near the upper end of the first steel plate and the lower end of the second steel plate;
Rotating to rotate the circular steel plate around the perforation attached to the circular steel plate;
A screw component that rotatably attaches the circular steel plate to the wooden building with the perforation as a rotation center in a state in which the circular steel plate is loosely fitted while leaving an upper space inside the tension hole.
A structure for strengthening the strength of a wooden building. In the second steel plate, a tension tool having the rotary lever attached to the circular steel plate holds the fiber sheet in a state of being tensioned between the first steel plate and the second steel plate by the rotation and rotation. 2. A structure for strengthening the strength of a wooden building according to claim 1, wherein a plurality of screw holes are formed to enable screwing to a side surface in the vicinity of the lower end of the drive unit of the wooden building. The screw component is a component that is removed from the wooden building when the second tool is removed from the wooden building after the second steel plate is fixed to the side surface near the lower end of the wooden building body. The proof strength reinforcement structure of the wooden building of Claim 2 characterized by the above-mentioned. The first steel plate, the second steel plate, and the fiber sheet are bonded to each other with an adhesive, and the foundation or the wooden structure is formed by a long screw using a screw hole formed in each of the first steel plate and the second steel plate. 2. A proof strengthening structure for a wooden structure according to claim 1, wherein the structure is fixed to a body. The structure for strengthening the strength of a wooden building according to claim 1 or 2, wherein the fiber sheet is a molded continuous fiber sheet.

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