The ceiling system in China is actually not a Japanese thing, but a Japanese thing. China people changed it a little, and it is a "Japanese imitation", but it sells well in China, just like Japanese cars are all over the country.
Card keel ceiling system is also transformed from foreign ceiling system, which is very convenient to install and saves materials. I have seen this kind of ceiling system in Australia, and the domestic card keel system seems a bit simplistic, which is suspected of cutting corners.
Kneff ceiling system is a little rare in the market, but it is widely used in Europe and America because it has few parts, fast installation and saves labor (foreign labor is very expensive).
China ceiling system:
The main keels are:
Main keel (load-bearing keel): DU50/DC60 keel (the thickness required by the national standard is not less than 1.2mm, but most keels in the market can't meet the national standard, but 1.0mm, 0.8mm or even thinner, so the quality of stressed keels can't be guaranteed. How to ensure that a system is good? )
Auxiliary keel and cross brace keel: DC50 keel (the thickness required by the national standard is not less than 0.5mm, and most of them are 0.4mm or thinner in the market).
China ceiling system:
China ceiling system is a complex system, just look at the accessories used:
Large crane (also known as the main crane, it is an accessory connecting the boom and the main keel)
Intermediate crane (accessory connecting main keel and auxiliary keel)
Large joint (also called main joint, which is an accessory used to lengthen the main keel)
Intermediate connection (also called auxiliary connection, which is an accessory to extend the auxiliary keel)
Hanging in the middle (also called towing, it is an accessory to hang the cross brace keel on the auxiliary keel)
According to the specifications of the main keel and auxiliary keel used, the specifications of these accessories are also different, for example, 60 main keel with 50 auxiliary keels, 60 large cranes and 60/50 medium cranes are used for large cranes.
Attention should be paid to the installation of suspended ceiling in China: the distance between auxiliary keels should not exceed 400mm, and the distance between transverse bracing keels should not exceed 600 mm. ..
Because some decoration companies cut corners to reduce the amount of cross-brace keel, only adding cross-brace keel at the joint of the board will often cause the quality problem of sagging and cracking at the joint, so special reminder! ! !
Card keel ceiling system:
Main keel: the national standard requires 0.8mm thick, and many on the market are only 0.6mm, so pay attention. There are many grooves like small ears on it, and the auxiliary keel is stuck in these grooves. Therefore, this system requires high dimensional accuracy of the keel. Once there is a small deviation, it is a big deviation. When the board is finally installed, it will be pulled into place, which will cause great installation stress, which will eventually lead to deformation of the ceiling and cracks in the joints. . . (dizzy. . . People always complain about this)
In fact, the shape of the main keel of similar systems abroad is similar to this inverted "V" shape, except that there is a component similar to a single small card position hanging on the main keel. When installing, this component is clamped into the auxiliary keel, and the position of the auxiliary keel can be adjusted at will, which will not cause the problem of strong pulling in place during installation.
Many people have a misunderstanding that gypsum board partition is not sound-proof, but it is not. Compared with solid walls such as brick walls, gypsum board partition wall has much better sound insulation performance, because it has a cavity structure, and its sound insulation principle cannot completely follow the "quality law". When the sound passes through the gypsum board wall, it is reflected back and forth in the cavity of the wall after many times of reflection, transmission and absorption, so it has excellent sound insulation performance.
For example: double-sided single-layer 12mm gypsum board +50 keel, filled with rock wool, the sound insulation performance can reach 42 dB (data in KNEFF manual), the wall thickness is only 74mm, and the wall weight is 23kg/ m2.
To achieve the sound insulation performance of 42dB with aerated concrete blocks, it needs 180 blocks, with 20mm thick cement mortar on both sides, 220mm thick wall, and the wall weight is 120kg/ m2.
For another example, the double-layer keel double-layer partition wall can achieve the sound insulation effect of 57dB, with a wall thickness of 2 18mm and a weight of 45kg/ m2. This sound insulation requirement is usually used in theater engineering, but if a solid reinforced concrete wall is used, it needs a thickness of 0.5m and a unit area weight of 1.250kg/m2. If bricks are used, it is conceivable that the weight per unit area is 1. . . It is estimated that the structural designer will faint.
I have Baidu! More detailed! You can have a look!