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 In less than a year competitions start at the Beijing Olympic Games. Huge construction sites still dominate the picture and there is intense activity everywhere.
30 000 workers are working day and night so that the planned Olympic locations will be finished according to schedule.
Superlative project
The Shunyi Olympics Rowing-Canoeing Park near to Peking is developing to an especially attractive location. Here, literally out of nothing, a gigantic rowing and canoeing park is being created in a 255
hectare area.
Construction is being executed on a 2.2 km long and approximately five metre deep rowing and canoeing basin with eight lanes and a wild-water complex.
Especially high demands are being placed on the plastic sealing sheeting for the artificial lake and wild-water complex. All in all an unbelievable amount of 720 000 m2 HD-PE geomembrane will be welded. The Chinese company that received the bid has been working with Leister welding machines and hand extruders for many years.
Daily, up to 19 000 m2 HDPE plastic sealing sheeting will be processed. This corresponds roughly to the surface area of three football fields. For the basin floor, 0.75 mm thick HD-PE material is being used. Welding is done with three Leister Twinny T combi-wedge welding automatons, which are especially developed for applications in civil and underground engineering. The combination of heating wedge and hot air during the welding process allows a welding speed of up to 4 m/min in spite of the low weight. Only in this way is it possible to achieve a monthly peak performance of up to 196 km welding seam length on the construction site in Shunyi.
For the waterside area 1 mm thick HD-PE is used which relies on processing with Leister devices. Two Leister Comet wedge welding machines easily climb the embankments and connect the sheets. Their drive technology is designed for the highest workload and the welding quality is flawless. The Comet is the smallest and lightest welding machine with integrated operating panel.
Just as in real-life
Next to the rowing basin an extensive artificial wild-water complex is being built for the canoe and kayak slaloms.
The watercourse the canoeists will traverse is 500 metres long. With a downhill gradient of 5 metres, which corresponds to the same requirements placed on the athletes on a natural watercourse. The wild-water course is lined with 0.75 mm thick HD-PE geomembrane. Even the vertical welding seams pose no problem for the agile and light Twinny T. The identical devices also prove themselves in tunnel construction for overhead welding.
Fine work with hand extruders
There are numerous bridges over the gigantic water complex. To protect the concrete pillars, they are encased in 0.75 mm thick HD-PE material and welded to the sealing sheets on the bottom of the lake. During the encasing of the concrete pillars and in those areas where the subsurface is too uneven, welding machines are not used. Instead, the FUSION 3 hand extruder from Leister is used. They are specially developed for civil and underground engineering, are easily manageable and in spite of their low weight, achieve an extrusion rate of up to 3.5 kg/h.
For further information contact: Carr Plastics Ltd Tel 0800 LEISTER or visit
www.carrgroup.co.nz
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