What caused the collapse of American apartments?
Site map of American apartment collapse
On the afternoon of June 24th, local time, DaniellaLevineCava, Mayor of Miami-Dade County, Florida, updated the search and rescue situation at the press conference of the apartment building collapse accident. After the collapse of the building, the search and rescue personnel have found 102 people to confirm safety. At least 99 people are still missing.
The collapse of a high-rise apartment in Florida, USA, has killed at least three people.
The apartment building is located in Sefside, a seaside town about 9 kilometers north of Miami Beach. It was built in the 1960s, with more than 100 apartment units, one third of which were full when the accident happened.
Building 1990 shows signs of sinking.
On June 24th, local time, according to a researcher at Miami International University, signs of sinking were detected in buildings that collapsed in Miami in the 1990s.
According to reports, the researcher published a research report in 2020, pointing out that after the building was built in 198 1, 1990, it began to sink at a rate of 2 mm per year. It is not clear whether the sinking speed has accelerated since then. However, the researcher also said that the reason for the collapse of the building cannot be arbitrarily drawn based on this research report.
In some ways, the collapse of houses is mainly caused by three factors: the first is the collapse caused by the quality problems of houses themselves; The second is the collapse caused by the intervention of the third party; The third is the collapse accident caused by the disrepair of houses. The accident responsibility of each kind of original collapse is different. The first is the collapse caused by the quality problems of the house itself; The quality of the house itself is not up to standard, and the construction unit cuts corners during the construction process, which leads to the instability of the foundation of the house and the substandard materials and technology of the load-bearing wall. The above comprehensive reasons weakened the disaster resistance of the house, and the safety problem of the house itself was serious, which led to the collapse of the house.
This year, many houses collapsed in China. People can't help but doubt the quality and safety of houses. So, how to check the quality of the house correctly? How to check the house when buying a house?
Look at the basics first.
For concealed works, especially building foundations, there are various forms of foundations. For example, you can see that high-rise houses are suitable for pile foundations and box foundations, while low-rise villas and multi-storey apartments generally use strip foundations. Of course, what form of foundation should be decided according to the local geological conditions.
Second, look at the wall.
There are several visual methods to identify the construction quality of the external wall: if the external wall is decorated with tiles, it is mainly to observe whether there is a phenomenon of falling off and unevenness, whether the joints of the tiles are horizontal and vertical, and whether the colors and textures of the tiles are coordinated.
If the exterior wall is cement mortar, then apply waterproof coating on the wall, and observe whether the cement mortar falls off or has cracks; At present, fair-faced brick walls are widely used in low-rise villas. This kind of wall has a classical and solemn meaning. Pay attention to whether the jointing of the brick wall is full and whether the brick is dense. If it is found that there are penetrating cracks in the external wall, then there must be something wrong with the design or construction of the house, and the house quality appraisal department should be asked to re-appraise it.
Third, look at the roof.
The roofs of civil houses are mostly flat roofs and sloping roofs. The main functions of the roof are waterproof, heat insulation and heat preservation. For top-level residents, the roof is a very important quality index.
First of all, you should go to the roof to check whether the drainage slope, drainage outlet and gutter organization of the roof are reasonable, and the downspout should be installed firmly, with smooth joints and no leakage. Roof panels are nothing more than integral cast-in-place slabs and precast slabs, and the waterproof performance of cast-in-place slabs is far better than precast slabs.
Fourth, look at the floor.
The floor includes two meanings: one is the ground at the bottom and the other is the floor of the floor. For the floor slab, first determine whether it is precast slab or cast-in-place slab. The floors of low-rise and multi-storey houses are mainly prefabricated members. It is necessary to observe whether the floor panel is flat and cracked. There are two reasons for cracks: first, the ring beam of the house is uneven, and the seat slurry is uneven when the board is laid; Second, the quality of precast slab is not enough and the bypass is too large.
The floors of middle and high-rise buildings are mainly cast-in-place slabs, which have good integrity and waterproofing. Mainly observe whether there are exposed tendons or honeycomb pits. The strength grade of concrete is invisible to the naked eye, so you can see the quality inspection report. If the quality of concrete is too poor, you can dig out the protruding places by hand, such as the corner of the column is a good place to check.
To sum up, the cause of the collapse of American apartments has not yet come out, and it is still under investigation. Judging from the news in recent years, there are more and more housing quality problems of owners, so housing safety inspection is very important. It is necessary for friends who buy a house to learn the skills of house acceptance.