(construction method of breaking up the beam/slab from below with a jack: Fig. 6), crushing method (Fig. 7), and cutting each material with a concrete cutter (Fig. 8), have been devised and utilized. However, since these construction methods were slightly expensive in practice and unrealistic, they were demolished with wrecking balls and large breakers (Fig. 9) with soundproofing measures. During this time period, the Japan Building Industry Association created the “Guideline for Pollution-Fee Destruction of Reinforced Concrete Construction”. Research related to construction methods using a crusher with slow detonation (slow explosive), methods using static crushing agents, water jet methods, electric heating methods, wire sawing cutting methods, has been developed among with connections to the method of demolition of the reactor vessel robot.In 1976, when a “nibbler” was introduced from the UK that chews down bends, a new demolishing machine was built and used by the hands of a demolition specialist/machine manufacturer. This was partly due to the development of the demolishing method, which had been led by construction companies later transferring to the hands of a demolition specialist/machine manufacturer. The crusher, which has relatively low noise and vibration and is highly efficient, drives away wrecking balls and replaces large breakers to become the main stream of demolishing machines. The crushing method is positioned as the most common method of demolition leading up to 2015, today (as seen in Fig. 10). Depending on the structure, shape, and location condition of the target structure, either (1) lift the heavy equipment to the upper floor and demolishes each floor from the upper floor, or (2) demolition by a ground demolishing method that demolishes from the upper floor in subsequent order by heavy equipment placed on the ground. Ground demolishing method (Fig. 11) has been applied to buildings that scale and height from 3rd to 4th floor buildings since about 1980. However, in recent years, a 40-60m class long-reach crusher boom has been developed, and if there is an open space where a demolition machine can be moved around the building, it can be demolished from the ground up to a height of about 35m. The operator decides to operate the crusher by looking at the Photo of the camera attached to the top of the boom.The demolition method from upper floor (Fig. 12) has been used since around 1980, and is currently being actively applied to the demolition of high-rise buildings in urban areas. With this method, a crane for hoisting the crusher on the top floor is necessary, and when using a crawler crane, it is limited to a crusher with a weight corresponding to its lifting performance. In general, the limit is about 15 tons.In recent years, in particular cases, it has become difficult to Fig. 8 Parts demolition using a cutterFig. 9 Demolition using a large breakerFig. 10 Current crushing attachment and heavy machine─ 38 ─5. Year 1985- Current (Era of Crushing Method)
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