English7
TABLE CONSTRUCTION.
The tables are assembled using a combination of 1.8-metre, 2.4-metre and 3.0-metre Alshor Plus ledger frames and 1.5-metre, 2.0-metre, 3.0-metre and 4.0-metre leg sections. The legs are connected one to another using the appropriate length frames. A range of access components combine to make the erection of the 7m high tables quick and secure. .
The primary bearers at soffit level are 225mm deep RMD Kwikform Albeam, chosen for their high bending and concentrated load capacity. These are bolted to U-heads at the top of each Alshor Plus leg. RMD Kwikform’s 150mm deep Alform and Alsec beams are incorporated as the secondary bearers, fixed to the Albeams using wedge action clamps, in some areas P C Harrington’s existing stock of secondary beams are being utilised.
RELOCATING THE ALSHOR PLUS TABLES.
Two components make the mobile table concept possible; the Alshor Plus Castor Unit and the load release mechanism. However, prior to relocating a table, the static elements of the shoring are first dismantled.
To reposition each table, the load is first released on the Alshor Plus legs in all four corners.
Releasing of the load enables the jacks on the corner legs to be raised clear of the ground by around 80mm, sufficient to allow the twin-wheeled Alshor Plus Castor Units to be wheeled into position under the jacks. These trolleys then take the table’s weight which enables the remaining legs to be raised clear of the ground, and the table to be manoeuvred into its new position. Even with the largest and heaviest tables on the Stadium site, two men can achieve this comfortably.
P J Harrington is convinced that the mobile table solution adopted at Wembley would have been impossible had it not been for the versatility and load capacity characteristics of Alshor Plus and the speed and ease with which the tables could be repositioned.
The combination of mobile tables and static shoring provides, he says, a very strong, rigid yet flexible shoring solution. Nevertheless, close liaison throughout the project between RMD Kwikform and P C Harrington is proving to be essential with continuing site meetings and
joint pre-pour inspections taking place weekly, sometimes twice a week.
