Expansion project of the Prophet’s Mosque in Medina and its Square, allowing for the accommodation of 1.2 million faithful, and the development of the infrastructure, transport networks and buildings, of the area surrounding it, known as Al-Ruwaq.
The client’s requirements were to firstly cast the ground floor (H=18.2m), datum point 0.00m, and then the one below (first basement, H=13.1m), undersurface level -5.15m.
The alternative techniques proposed by Pilosio consisted of making a grid of shoring towers (dimensions 1.0m x 1.5m at an average height of circa 15m) either with the Simplex system or the Multidirectional MP system, or with a combination of the two. The final choice fell solely on the use of the MP multidirectional system due to its greater flexibility when being installed in areas with particular comolation restrictions and with foundations at
different levels (bearing capacity required: circa 50kN/foot, which was guaranteed nonetheless by all three systems).
The chosen technical solution has been further implemented to use the features of the Pilosio product to their best advantage, as well as to have a smoother running and more efficient site.
Complex project where Pilosio provided project design and on site assistance:
Each individual MP tower has been “designed” to be divisible in at least two parts in height. The upper part can be removed by transferal, leaving the support system, that is the lower part of the tower, already set in place for the casting of the second slab at level -5.15m;
The MP towers can either be built up in-situ or in a specified area (of the site). In the second case, the towers are then moved and placed in their final positions by on site cranes;
Once the casting has been done, the towers can be dismantled in-situ or relocated individually or in groups in adjacent areas. The removal of the towers takes place with a system of wheels to fix to the base of the 4 columns of the tower enabling fast transferal.
To contain the casting of the drop beams (3m height) present in the two floors, standard P300 formwork has been opted for, supported directly on the MP towers.
Reshoring the slab at level 0.00m: on the necessity to transfer the load bearing of the upper slab to the pile driven foundations located at level -15.80m. The technical solution adopted by Pilosio still foresees the use of the MP multidirectional system by opting for heavy duty MP towers. The new MP HD heavy duty tower is achieved by coupling and connecting the 16 uprights for each column of the tower to each other with standard elements, in order to reach the minimum capacity rate required (in this particular case, reaching the considerable capacity of 600kN per column). The final towers obtained in this way are then placed in correspondence with the loads, thereby relieving the slab of any stress.