2005 - Putzmeister

Title StoryTitle StoryConcrete mixing trough as anadditional "buffer"Of the two trailer pumps, one serves as themain production unit being fed via aPutzmeister JT-5000 jumbo trough – a surgehopper directly flanged to the pump's hopper.The jumbo trough with a concretecapacity of 5 m 3 allows a quick and fulldischarge of the mixer trucks into its largecapacity hopper. The buffer function of themixing trough means it is also possible tocontinuously supply the main pump (max.output 95 m 3 /h) with concrete.The second Putzmeister trailer pump servesas backup because cold joints are absolutelyforbidden or the powerhouse would bestructurally deficient. Consequently, in caseof an equipment malfunction, the secondpump can finish a pour.Ken said, "We basically have to almostduplicate equipment needs because of ourremote location 15 hours away fromMontreal. With 600 men on a job, we can'tafford down time. Fortunately, no majorproblems have resulted to-date, and theequipment has performed to our demandingexpectations."17From April to November 2004, concretework for the powerhouse took place. Two24 m tall placing boom towers wereanchored with bolts and had to be preciselymounted in specified locations so no coldjoints would interfere with the flow ofwater upon project completion."Z" folds show their strengths underthe roofThe two placing booms – each using theirfull 30 m horizontal reach – first providedfull coverage to place concrete for both thewalls of the huge turbines and the powerhousestructure itself.In November, the two towers were movedto handle the intake structure. This time,they were supported by 4.5 m x 4.5 m x1.2 m high poured concrete mats, and theplacing booms still provided ample reachto all concrete placing areas.Especially noteworthy is the placingboom's Multi-Z boom configuration, whichproved exceptionally maneuverable inworking under the low roof of a temporaryoverhead steel structure. The structure wasspecially built so construction could continueduring the frigid winter months.AECON HOCHTIEF is also handling thehorizontal concrete work for the penstocks.The three enormous penstocks are concretelinedconduits excavated in the rock tochannel water from the reservoir to thepowerhouse turbines and are designed tomaximize the head (drop in level).A Putzmeister BSA 2109 H-D trailer pumpis pumping the concrete lining of these107 m long penstocks, each at a 7.6 m diameterranging from a 0.3 m to 1.2 mthickness.Important: reliable machinesa n d good serviceBesides the equipment's proven performance,service and support capabilities were asignificant factor in AECON HOCHTIEFselecting POMPACTION for their equipmentneeds. POMPACTION assisted inspecifying the appropriate equipment, helpedtrain operators, and is making servicecalls when deemed necessary.19Project manager Ken Chryssolor(Photo: AECON HOCHTIEF)18The two PM MX 30 stationary booms are installed in 24 m high lattice towers (Photo: POMPACTION)20A Stationary concrete pump BSA 2109 H-DB „Jumbo“ Trough mixer JT 5000C ZX delivery lineBAC6PM 3723 GBA MX 30 used for concrete placement in the turbine house. One of the inlet tunnels is shown in the background (Photo: SEBJ)7PM 3723 GB