Naslov
Blasting demolition of part of the Belevue Hotel

Autori
Dobrilović, Mario ; Bohanek, Vječislav ; Škrlec, Vinko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Lyon Conference Proceedings 2015 / Farnfield, R. et al - : Agora Marketing Communications Ltd., 2015, 79-85

Skup
8th World Conference on Explosives and Blasting

Mjesto i datum
Lyon, Francuska, 26.04.2015. - 28.04.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
blasting demolition; blast design

Sažetak
The Bellevue Hotel is situated in the bay of Čikat on the island of Lošinj, an important tourist centre in the region of Kvarner in Croatia. During the reconstruction and renovation process it was necessary to demolish the south wing of the hotel at the first stage, and the part of the north and west wings at the second stage. Due to very fast reconstruction works it was decided that the demolition of the south wing and the part of the north and west wings would be carried out by blasting. Blast design, preparation and blasting operations were completed within a week. Floor plan dimensions were 46.20 m x 15.20 m. The demolished part of the building consisted of three floors and a ground floor. The structure consisted of load-bearing walls and beams. The first phase of the demolition was carried out by blasting 16 load-bearing columns. The cut height and explosive mass necessary for concrete crushing was determined for each column. In that way static load capacity was completely eliminated resulting in kinetic energy necessary for breaking and crushing elements during free fall. Detonation sequence of explosive charges of individual load-bearing elements determined dynamic scheme of breaking the structure, as well as spatial rotation and translation in the free area. Drilling and blasting parameters were calculated for complete fragmentation of concrete elements. Boreholes of diameter 32 mm were initiated by LP detonators with delay interval of 100-200 ms, thus resulting in planned delay of individual boreholes and the breaking of “node” points of the structure before the fall. The columns in the south wing were immediately connected to the columns in the east and west wing, and the damage of the afore-mentioned columns had to be avoided. In the second phase of demolition parts of the north and west wing had to be demolished. Taking into account the integrity of the wing, it was a very demanding situation from the engineering point of view. The proximity of load-bearing columns that must not be damaged and short deadlines for demolishing made this project exceedingly demanding.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA