What are the main causes of the collapse of the suspended flat roof?

The main reasons for the collapse of the hanging flat roof can be summarized as follows:

1）"Spikes towards the sky"。There are many ways to fix the boom and the floor slab, among which the wooden tenon is driven into the floor slab (concrete floor slab) with a wooden tenon, and the wooden tenon is nailed into (held in) with an iron nail or screw facing the sky; Some use steam nails to fix the wooden material to the sky, so as to fix the boom; Or use a nail to drive into the concrete floor slab to fix the hanging point of the boom; Or fix the primary and secondary keels or wooden booms with iron nails nailed towards the sky. It's all genus"Spikes towards the sky"category.

2）"Flatten the top"。The flat top does not use a boom crane, but the keel of the flat top is directly fixed on the side of the surrounding wall or beam with a needle, so as to fix the flat top.

3) Boom overload. Booms for flat roofs are scarce or too thin, and the weight of the flat ceiling exceeds the force that the boom can withstand.

4) The wooden boom splits or the steam needle is too short and too few.

In the above four cases, when the living room is just decorated, the flat roof will not collapse immediately, but after a period of time, the friction of nailing into the floor slab against the sky will bear the weight of the flat roof; The flattened top is only fixed around the perimeter, there is no boom in the middle of the keel, and the keel is deflected downward; booms are scarce; Wooden boom splitting or nails nailed into insufficient length, too fine, etc.; When the flat roof is shaken for a long time or the flat roof is vibrate, it will cause the flat roof to collapse accident.

Our family has not seen this situation in the ceiling bought online by the veteran building materials, but the decoration supervisor must also pay attention to it.

1. The suspension rib keel and gypsum board used in the ceiling do not meet the requirements of the specification or unqualified products, 2. The construction process does not meet the requirements, and the deformation coefficient is not considered.

3. Collapse and water leakage caused by external reasons.

1. "Nail to the sky".

The boom or pendant is fixed with the floor slab, which is simply drilled, and then driven into the floor with a wooden tenon and then driven into the wooden tenon with iron nails or screws; Because the nails are only driven into the wooden tenon by the nails, relying on friction with the weight of the flat roof, the nails are loose for a long time, which may cause the overall collapse of the ceiling.

2. "Flatten the top".

It is not conducive to the load-bearing of the boom, but simply fixes the keel of the ceiling directly with nails into the side wooden tenon of the surrounding wall or beam, so as to fix the flat ceiling. The ceiling is only fixed around the perimeter, and there is no boom bearing in the middle, which is easy to cause the ceiling to collapse for a long time.

3. The ceiling is too heavy.

Some of the ceilings are extremely complex, which also causes the ceiling to be too heavy, and the force that exceeds the capacity of the boom can also cause the ceiling to collapse. In order to avoid the overall collapse of the ceiling, it is not only necessary to rely on the side to nail into the wooden tenon during construction, but also to use expansion bolts on the top surface of the floor slab to strengthen the force. In addition, the ceiling is divided into a human ceiling and a non-human ceiling, and there must be a distinction when choosing materials, and the quality of all materials must be guaranteed.