English6THE MOBILE TABLE SOLUTION.
According to P C Harrington, utilising mobile tables has, so far, reduced the site labour requirement at Wembley by around 20 percent.
A team of engineers at RMD Kwikform’s Aldridge head office devised a solution that maximised the area supported by mobile tables, while minimising the number size variants. Each floor has around 300 table positions, supporting approximately 75 percent of the total slab area.
The engineers produced a general arrangement layout drawing for each floor showing the pour locations and sequence These drawings are colour-coded to clearly indicate the location of reused standard tables, new tables and areas of static makeup. Detailed plan and section drawings were produced in turn for each individual pour showing the tables, in-situ erected static sections of shoring and the location and spacing of the secondary bearers. The drawings for each pour drawings include a schedule identifying the tables by type and give precise details of the components required for the static areas of shoring. RMD Kwikform also produced detailed construction drawings for each table type. These were produced as A3-format booklets for use by the P C Harrington table assembly and erection teams.
To date RMD Kwikform engineers have devoted between 2,500 and 3,000 man-hours to the project and produced some 300 drawings. This is expected to rise to 400 by the time the project is complete. The largest Alshor Plus table measures 7.2 metres by 6.0 metres and weighs approximately two tonnes, while the smallest table is 3.6 metres by 3.2 metres and weighs one tonne. All are around seven metres high.
Alshor Plus components are stored and tables are assembled in an area adjacent to the slabs. Once assembled, the tables are craned into approximate position and are then manually manoeuvred into their precise required location by a two-man team using the recently introduced heavy duty Alshor Plus Castor Units
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.
