Scope of works
It is proposed to support the new structure on piled foundations, while a piled retaining wall is required to support the deep excavation for the proposed single level basement with pile caps located within the basement floor area. The piled retaining wall will also function as a permanent component of the new basement structure. Wall retained height varies from 5.2m in the temporary condition to 4.3m in the permanent condition. In addition to lateral earth/water retention, the pile retaining wall is also subject to service vertical compressive loading of up to 630 KN/pile and overturning moment of up to 160 kNm/m run of wall from the proposed superstructure. The foundation piles are subject to service vertical compressive loading of between 300 KN- 850 KN.
Installation of 98mtrs of 450mm diameter @ 600mmc/c piled retaining wall is required to enable
construction of single level basement and reinforced concrete pile caps located within the basement area.
Installation of Underpinning to boundary walls along with King Post system.
Temporary propping to capping beam alongside eastern elevation; installing 4 no 45 degree raking RMD Kwikform 324 tube shores, 1 no Kwikform 324 corner brace, 4 no 1mtr x 1mtr x 1mtr deep mass concrete thrust blocks.
Bulk excavation to basement coordinating with temporary works to ensure that movement monitoring to eastern elevation did need exceed 5mm in movement.
Design and installation of crane base to accommodate Jaso J80PA tower crane which has a height of 23.7mtrs and jib length of 25.5mtrs.
Installation of reinforced liner walls, concrete columns, walls, lift core, and floor slabs which varied between 200mm – 300mm thick, for 1st, 2nd, 3rd,4th floors and roof, each floor was typically 467m2 in size.
Installation of site drainage which covered; 5mtr deep pre-cast manhole chambers, pumping chambers including flow controls, associated rising mains, site attenuation tanks, testing and commissioning all installed works.