Joining and reinforcing wood and steel
By employing co-shaped members and high-strength steel reinforcement materials to distribute earthquake loads and provide vibration control, the solution addresses the limitations of existing reinforcement methods, enhancing the earthquake resistance and preventing collapse of wooden houses.
Patent Information
- Application Number
- JP2024004298U
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-05-08
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing reinforcement methods for wooden houses do not adequately address the increased load and vibration impacts during earthquakes, leading to potential collapse despite improved basic strength and earthquake resistance.
The implementation of co-shaped members and high-strength steel reinforcement materials to reduce the impact of earthquake loads by distributing the weight more evenly and providing vibration control, with a focus on supporting structures outside the home to minimize additional weight and loads.
This solution enhances the earthquake resistance of wooden houses by reducing the load caused by vibration shocks, thereby preventing collapse and ensuring effective vibration control through targeted reinforcement.
Smart Images
Figure 0003251179000001_ABST
Abstract
Description
[Background technology]
[0001] Since the Great Hanshin-Awaji Earthquake, there has been great damage to old wooden houses with heavy roofs. The Building Standards Act has been revised, earthquake resistance standards have been raised, and methods such as frame bracing have been proposed, which have improved damage to houses. However, issues remain, such as the load on existing buildings due to the increased weight of reinforcement materials and joints at intersections, and earthquake resistance measures are limited to a certain extent. To realize earthquake resistance measures for houses, we will carry out clear and inexpensive earthquake resistance construction. [Prior art documents]
[0002] Utility model registration No. 31351115
[0003] Patent No. 2024-122325 Patent Publication No. 2024-120004 Summary of the Invention [Problem to be solved by the invention]
[0004] A method of strengthening wooden houses that do not meet earthquake resistance standards has been proposed, and in recent years, lightweight and strong houses have been provided, improving the basic strength of existing buildings and enhancing earthquake resistance, but deterioration is unavoidable and further reinforcement methods are necessary. Focusing on the fact that the heavier the building is, the greater the load is due to earthquake motion, we devised a U-shaped member arrangement that can reduce the effects of earthquake motion and reinforcement that can mitigate the impact, and a means to solve the problem.
[0005] A long U-shaped member is installed horizontally at the joint between the beam and column, and a T-shaped member made by welding a short U-shaped member of the same length as the column at a right angle to the tip of the U-shaped member horizontally is joined to the column and combined with the U-shaped member of the beam and supported by an external foundation. Two sets of members with rectangular steel plates welded to the ends of the U-shaped members in contact with the beam are attached to the beam in a V-shape and supported by a long rectangular strip footing. A thin steel plate is welded to the end of the U-shaped member and joined to the column, and attached to each of the two sets of columns so that they form a right-angled triangle. The reinforcing wood on the inside of the second floor is fixed to the column horizontally. The intersection of the beam and column directly below the corner column on the second floor is reinforced with a steel plate as a preliminary reinforcement for the next vibration-damping reinforcement. At the intersection of the beam below the second floor and the corner column on the second floor, a concave structure is welded onto a T-shaped steel plate, to which the U-shaped member is installed at an angle, joined with bolts and supported by a foundation away from the building. Effects of the idea
[0006] The earthquake resistance standard is based on the existing building's natural strength of 1, and a certain percentage is multiplied to make the earthquake resistance part. Focusing on the fact that a constant load occurs as a load that can occur during an earthquake, adding it to the basic strength to reduce the load caused by vibration, impact, and shaking, the best form to prevent the collapse of wooden houses by reinforcing weak parts of structural members and implementing it until the vibration control effect can be expected, so that it is possible to devise a response in the early stages of an earthquake.
[0007] The concept of seismic isolation reinforcement is based on basic reinforcement of weak points, earthquake resistance reinforcement, and vibration control reinforcement. The reinforcement is supported outside the house, and the reinforcement material is high-strength steel, which eliminates the load at the joints with the building and reduces weight. The vibration control reinforcement equivalent to the through columns of traditional buildings eliminates temporary loads such as shaking and shock caused by earthquakes.
[0008] See Figure 4. The pre-reinforcement second floor is reinforced from the indoor side with timber (150mm x 40mm x 2200mm) placed horizontally on the columns, the joints between the second floor corner columns and the upper beams of the first floor are made by drilling 10 φ12 holes in steel plates (100mm x 9mm x 700mm x 2 layers), the beams are pre-drilled, and bolts (75mm φ10) are glued and driven in to be riveted. Six φ12 holes are drilled on the left and right sides of the steel plate (100mm x 9mm x 700mm), three holes are drilled at right angles from the center in a steel plate (100mm x 9mm x 600mm) and welded to form a T-shaped joint plate, 200mm of concave steel is cut out on the top to reinforce the sides and one side to create a joint support structure, the linear distance between the planned location of the foundation concrete and the joint, the horizontal distance between the beam and foundation, and the height of the joint are measured, and the inclination angle of the concave steel and the drilling position are determined using Pythagoras' theorem. A T-shaped structure was welded at an angle with four φ18 holes drilled, and bolted to the wood at the intersection of the pillar and beam, and in contact with the pre-joint steel plate. The foundation concrete was placed a short distance away from the building, and the reinforcement and anchor bolts were connected to pour the basal concrete. The distance between the drilled holes of the concave structure and the basal concrete was measured, and the length of the U-shaped reinforcement material was determined by copying the reinforcement drilling positions at both ends, which was 4280 mm in this case, and one end of the U-shaped steel material was drilled with four φ18 holes. The U-shaped member was delivered to the erection position and joined by inserting two φ16 bolts, each 20 mm long. The foundation part of the U-shaped member was inserted with rebar into the six holes drilled at the end, and reinforcement was arranged within the formwork of the superstructure of the foundation concrete, and a 1:1 mixture of cement and crushed stone was poured, and the material was shaped into a 30 cm cube with mortar. The small members (SS400) were painted with rust prevention and coal tar. [Brief description of the drawings] [Figure 1] Front and side view of wooden column and beam reinforcement [Diagram 2] Front and side view of wooden column and beam reinforcement [Diagram 3] Structural diagram of wooden beam-column joint plate and U-shaped member joint [Figure 4] Temporary load distribution during earthquake
Claims
1. Shape of joint between U-shaped channel steel, joint plate and beam-column
2. Reinforcement structure design
3. U-shaped channel steel and beam-column bolted structure