JP3769715B2 - Reinforced structure of wooden frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure for improving the seismic performance of a wooden frame.
[0002]
[Prior art]
As is well known, as a wooden frame in a traditional wooden building such as a shrine or the like, as shown in FIG. 7, the pillars 1 (the middle pillar 1a and the outer pillar 1b) made of log material are penetrated by 2 The most common is the concatenation. The penetrating holes 2 are called head penetrating holes (2a), jumping penetrating holes (2b), foot penetrating holes (2c), etc. depending on their mounting positions, but in any case, as shown in FIG. It is fixed using a wedge.
[0003]
[Problems to be solved by the invention]
The seismic performance of a wooden frame with columns 1 and throughs 2 as described above is determined by the strength of the joints (joints), but the strength of the throughs 2 at the joints is not always sufficient with such wooden frames. It cannot be secured. That is, as shown in FIG. 9, when the wooden frame is deformed by receiving a horizontal force, a force p such that the pillar 1 crushes the through 2 acts on the through 2 at the joint, The force p is perpendicular to the fiber direction of the through 2. And although wood has sufficient strength for the force acting in the direction parallel to the fiber direction, it does not have sufficient strength for the force acting in the direction perpendicular to the fiber direction. Therefore, the penetration 2 cannot exert a sufficient proof strength with respect to the force p. Note that the reaction force p ′ of the force p acts on the column 1 from the through hole 2, but the reaction force p ′ acts in a direction parallel to the fiber direction of the column 1, so that the column 1 has its reaction force p ′. Can naturally exhibit sufficient proof stress.
[0004]
From the above, it is assumed that the wooden frame as described above will be damaged before the pillar 1 in the event of an earthquake, and in the case of preserving a wooden building with historical value, the earthquake resistance In order to ensure the performance, it is said that the reinforcement of the wooden frame, particularly the reinforcement against penetration, is necessary.
[0005]
[Means for Solving the Problems]
In view of the above circumstances, the present invention is a reinforcing structure for improving the seismic performance of a wooden frame, which uses a steel frame as a through hole provided through a wooden column, and surrounds the through hole with wood around it. A decorative material made of is attached, and a connecting material that prevents the adjacent columns from opening is provided inside the decorative material along the through hole.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the wooden frame of the target building is reinforced in order to improve its seismic performance for the purpose of preserving historical wooden buildings.
[0009]
In these drawings, reference numeral 11 denotes a pillar (a middle pillar 11a and an outer pillar 11b) made of a log material. Further, reference numeral 12 is a penetration, in particular, 12a is a head penetration, 12b is a penetration, and 12c is a foot penetration. In this embodiment, the pillar 11 and the head penetration 12a are left as they are, the jumping 12b is replaced with a steel frame from the original one, and the joint between the foot penetration 12c and the pillar 11 is further reinforced.
[0010]
That is, in the present embodiment, a small-section H-section steel (for example, BH-150 × 60) is used as the flying 12b, and the intermediate pillar 11a is penetrated by the gusset plate 13 between the outer pillar 11b and the middle pillar 11a. By connecting with each other, the outer pillars 11b on both outer sides are laid horizontally. The existing mounting holes formed in the pillar 11 are used as much as possible as mounting holes for mounting the flying members 12b made of the steel frame.
[0011]
Thus, by using a steel frame as the flying member 12b, the strength is remarkably improved as compared with the original penetration made of ordinary wood, and the strength of the joint portion is improved to the strength of the column 11 (parallel to the fiber direction). Direction strength). It should be noted that reinforcing ribs 14 are provided at the main points of the steel frame as the flying members 12b in the illustrated example to further strengthen the steel frame.
[0012]
However, if the above steel frame material is left exposed, the appearance changes greatly from the state when it was founded, and the purpose of preservation is taken. Therefore, in this embodiment, makeup made of wood around the steel frame material is used. The material 15 is attached so as to form a box shape, and the steel frame material is concealed so that the appearance is not changed from the state at the time of construction as much as possible. The decorative material 15 in the illustrated example imitates a long push-like makeup penetration, and its end is inserted into an existing mounting hole formed in the column 11.
[0013]
Moreover, in this embodiment, in order to further improve the earthquake resistance of the shaft assembly, a steel bar (connecting material) 16 that connects adjacent columns 11 and serves as an opening stopper is provided. The steel bar 16 is also provided along the upper or lower part of the steel frame and is hidden inside the decorative material 15 so that it cannot be seen from the outside.
[0014]
Furthermore, in the present embodiment, the column base of each column 11 is fixed to the floor by the fixing bracket 17 to further reinforce. The fixing bracket 17 has an angle shape, which is fixed to the floor with anchor bolts 18 and the column 11 is fixed with lag screws 19. The original (or similar) foot penetration 12c is attached so as to hide the fixing bracket 17, and the appearance of the foot penetration 12c at the time of creation is left as it is.
[0015]
As a result, it is possible to greatly improve the seismic performance and durability of the existing wooden frame of the building to be preserved while maintaining the appearance of the building almost in its original appearance, so that this building can be safely stored in the future. Is possible.
[0016]
It should be noted that the original jumping and other existing items removed when performing the above-mentioned reinforcement are stored separately in order to wait for future restoration opportunities. In addition, it is necessary to keep a record for a long time so that details of such reinforcement will become clear in the future.
[0017]
By the way, in the above-described embodiment, the flying penetration 12b is the object to be reinforced, but not only the head penetration 12a and the foot penetration 12c shown in FIG. 1 but also other penetrations such as a ceiling penetration, an inner leg penetration, a waist penetration, and a water penetration. Of course it can be applied to. Moreover, as a steel frame material used as a penetration, the thing of arbitrary cross sections can be employ | adopted not only in a H-section steel, but when a penetration is thin, using a strip steel plate is also considered. Further, the connection between the steel frames is not limited to the bolt fastening by the gusset plate 13, but may be welding or flange joining.
[0018]
Moreover, although the said embodiment is applied to the reinforcement for the purpose of preservation | save of a historical building, this invention can be applied also to the reinforcement of a normal wooden building, and also a newly built wooden building . In addition, reinforcement of the column base by the fixing bracket 17 is arbitrary.
[0020]
【The invention's effect】
Since the present invention uses a steel frame as a penetrating through a wooden column, it becomes possible to increase the strength of the joint to the strength of the column as compared to the case of a normal wooden penetrating, therefore The seismic resistance and durability of the frame can be greatly improved, and it is suitable for application for reinforcement for the purpose of preserving historical wooden buildings.
[0021]
Further, since a decorative material made of wood is attached around the perforation so as to surround the through hole, the appearance is not different from that of a wooden frame, and it is optimal for the purpose of preserving a wooden building.
[0022]
Furthermore, since the connecting material for preventing the adjacent columns from opening is provided inside the decorative material along the penetration, the earthquake resistance can be further improved without changing the appearance of the shaft assembly.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, and is an elevation view (main part cross-sectional view) showing an entire shaft set after reinforcement.
FIG. 2 is an enlarged view of the main part of the same.
FIG. 3 is an enlarged view of the main part of the same.
FIG. 4 is an enlarged view of the main part of the same.
FIG. 5 is an exploded perspective view of the same.
FIG. 6 is an exploded perspective view of the same.
FIG. 7 is an elevation view showing an example of a typical wooden frame.
FIG. 8 is an enlarged perspective view of the joint portion.
FIG. 9 is a diagram schematically showing a state at the time of deformation.
[Explanation of symbols]
11 (11a, 11b) Pillar 12 (12a, 12b, 12c) Nut 15 Cosmetic material 16 Steel bar (connecting material)
17 Fixing bracket

Claims (1)

It is a reinforcing structure to improve the earthquake resistance of the wooden frame, and uses steel frame as a penetrating through the wooden pillar ,
A decorative material made of wood is attached around the perforation ,
A reinforcing structure for a wooden frame, characterized in that a connecting member for preventing an opening between adjacent columns is provided inside the decorative material along the penetration.

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