Briefly look at the same earthquake shelf, comment on the difference.
Because the East Japan great earthquake, the Kumamoto earthquake and the major earthquake damage continued, it is no wonder if it happens again in the near future in the historical perspective.
There are surprisingly many people who are concerned that a big earthquake will hit again.
Even if it became a severe earthquake of seismic intensity 7 class, even though it did not directly like the afflicted area, indirectly due to the fall of large furniture such as bookshelf and cupboards and appliances and electric appliances, Interest has risen to some extent.
However, accurate knowledge on anti-earthquake furniture is still inadequate, and it is the present situation that buyers decide to purchase by asking if they are described as anti-seismic furniture at a dealership.
Even in a bookshelf that looks like the same earthquake-resistant specification at a glance, there are differences in its contents, and the differences will be explained from what seismic shocks do not work with almost a pretense to what is really equipped with earthquake resistance functions.
Recommended No.1 earthquake-resistant bookshelf!
■ Points
◎ Brace bar and top plate: The brace bar and the top plate are fixed with screws
◎ Brace function: Tension is applied by spring
◎ Plate side plate: single plate
◎ Thickness of board: 2 cm or more
◎ Earthquake resistant experiment completed
The most recommended item as an earthquake-resistant bookshelf is a “brace-resistant” bookshelf.
“Strong earthquake resistance” is a commodity whose bookshelf, brace bar, top board is set to make earthquake resistance on bookshelf, Yamato limited company is registering trademarks.
Its feature is product development that gives earthquake resistance to the entire bookshelf below.
The brace bar and the bookshelf · the top board are firmly fixed by screws and double nuts and it is difficult to come off.
Because the spring is loaded in the brace bar, the tension (expansion and contraction) is applied when receiving the vibration of the earthquake, and the strength to suppress the fall of the bookshelf is excellent with the brace-type earthquake resistant function receiving the shake.
A single plate is used as the main spindle of the main body side, it is hard to deflect even if it receives vibration, it is durable without breaking or breaking.
The thickness of the board used in the bookshelf is 2.1 cm and thicker than the usual 1.5 cm, it is strong and hard to break.
We are doing product development by conducting seismic performance experiments with seismic intensity of 6 to 7 in the Great Earthquake class.
No.2 The most important bracing function is weak!
■ Points
× brace bar and top plate: the brace bar and the top plate are not fixed
× Brace function: No spring
◎ Plate side plate: single plate
◎ Thickness of board: 2 cm
◎ Earthquake resistant experiment completed
Those that are sold as bookshelves or racks that are stiff by breaking the ceiling and are sold as bookshelves and racks, we can see things that are weak in braking seismic function, which is the most important function as a bookshelf prevention function.
For example, the brace, the bookshelf, and the top plate are not fixed with screws or nuts, and when it receives large vibration, it is likely to easily come off.
As for the spring which is the feature of the bracing function, there is no wearing or if it is not fixed, it does not fulfill its function only by form, so it is a little problem to squat an earthquake.
Among these products, one board is used for the side plate of the bookshelf, and the thickness of the board is 2 cm, which is high in strength, and some have cleared the magnitude 7.9 in the experiment using the seismic vehicle.
The important point is that it tends to be misleading by the figure of magnitude 7.9, in fact it is equivalent to less than 5 seismic intensity, the eastern Japan great earthquake was magnitude 9 (seismic intensity 6 to 7), the metropolitan area was stronger than the intensity of 5 from 6 to 6 about it.
If you are close to the epicenter, you will feel uneasy, if you’re away it will be alright enough to be earthquake resistant.
No. 3 It is cheap but poor!
■ Points
◎ Brace bar and top plate: The brace bar and the top plate are fixed with screws
◎ Brace function: Tension is applied by spring
× Plate on the side of the body: Joint board
× Plate thickness: 1.5 cm
No earthquake resistance test
Inexpensive, simple, stylish and fashionable, there are some weak ones in the earthquake-resistant bookshelf that young people seem to like, apparently the bookshelf’s strength is weak.
Despite having the spring function which is the essential part of the bracing rod, the brace rod and the bookshelf · top plate are securely fixed with screws and double nuts, the side plate which is the main axis of the bookshelf is provided with a plate with a connection type seam It is a bookshelf that is using a plate of 1.5 cm weak or earthquake resistant to the thickness itself of the board.
Even if it is possible to stop the fall of the bookshelf with precision by the bracing function, the wood of the bookshelf body which was subjected to the big trembling bends easily, it is easy to break, it breaks from the seam and leads to the collapse of the bookshelf.
Of course, these products do not conduct earthquake resistance experiments, and there is no mistake that there is incompleteness in earthquake resistance.
No.4 This is just a pretense!
■ Points
× brace bar and top plate: the brace bar and the top plate are not fixed
× Brace function: No spring
× Plate on the side of the body: Joint board
◎ Thickness of board: 2 cm
No earthquake resistance test
Some items sold as earthquake-resistant bookshelf are cautioned when purchasing, as there are some products that mimicked a shimmering earthquake just like an appearance.
Firstly, if the brace bar and book shelf / top board are not fixed with screws or nuts and there is no spring function, the top board will easily come off by the vibration of the earthquake causing the stick to stick into the ceiling will occur.
And she can not support and support the vibrations she received on the shelf, leading to falls.
If the side plate used for the bookshelf body is a connection type, it will break from the joint when subjected to a big shaking, how much it is said that the thickness of the board being used is 2 cm and even if it says that there is strength, the collapse of the bookshelf is inevitable Hmm.
Because these bookshelves are commercialized without performing earthquake-resistant experiments, the bracing rods are useless in the event of a large earthquake, which can lead to the worst situation that the sideplates break and collapse as they collapse.