Demolition techniques of modern buildings.
When buildings are built at least since the creation of the World Trade Center, their demolition is considered when construction is planned. We no longer engineer systems and facilities that saddle our future people with the challenge, and sometimes impossibility, of safely removing them some time in the future.
In most cases the demolition process is governed by the basic material used in the core construction, Its frame and foundations. The lower level and mid floor level buildings have a tendency to be made of lighter material such as wood and steel wall framing around light central core steel and concrete towers such buildings can be hydraulically torn apart by the right head on excavators, and or knocked over by loaders, and bulldozer. brick and lightly reinforced mid size buildings can be battered with a wrecking ball of various sizes and scooped up and loaded. But when it comes to high story, steel and reinforced concrete buildings, the skyscrapers, and massive steel warehouses, hangars and factory floors, the most cost effective way is to degrade the foundations, annihilate the center structure and let the building pull itself down upon itself in its own weight. For this to occur a detonation plan is implemented for each gravity center section of the steel box girder and reinforced concrete structure in order to use this mass and its attachments to the outermost part of the buildings frame to control where the debris falls upon collapse, containing collateral damage. It is for this very necessary reason that the outer steel skin design of the World Trade Center Twin Towers, was never duplicated. For the simple fact that controlled implosion cannot be utilized in order to bring a controlled collapse. There is only one known demolition process possible in order to bring a controlled removal of a ‘drain-pipe’ steel and reinforced contcrete structure, and that is to cut it apart and removal with crane. This method is expensive and conducted whenever absolutely necessary usually in regards to toxic and contaminated material and or hazardous and specifically high risk removals that cannot be left to erode (Dams, Nuclear reactors, Gas weapons manufacturing sites, large refineries. Without Automated cutting and computer controlled removal this would be an extraordinarily expensive way to remove a building and is therefore a red flag in the ‘uncontrolled demolition’ of the World Trade Center Twin Towers 2001. I call this an ‘uncontrolled demolition’ in reference to a challenge and empirical observation of the intact external skeletal structure of both buildings after impact, and the necessary energy in both explosive ignition and output heat / time necessary to create a powdering of concrete and a slashing of steel girder panels three wide and two long in standard I beam length and double thick in standard I beam dimension steel, which is what these two buildings used as thier superstructure in order to hold their own weight against gravity. This entire super-structure skin needed to be torn into bits explosively and removed from the path of the ‘above’ impact floors, in order to ‘allow’ them to fall to the ground at or near the physical rate of gravity. This was IMPORTANT, to minimize the life material and cost collateral of this ‘uncontrolled demolition’. It is ‘uncontrolled’ because there is no predictable conclusion to how it will come about, even though clearly, three synchronized detonation sequences occurred after the semi-random ‘triggering’ impacts of two airplanes which were shredded against the outer skin setting fire to a small number of floors and arguably reducing the reliability of any fuse preparation in or around that area. Well played, but played none the less. Motives as to why this would be contrived to take place exist in another article here.
