Hydraulic ram pumps and Sling Pumps

5.3.6 Roof shutteringFigs. 5.45 and 5.46 show different stages of the roof shutter based on a central pole. The platformfor the pole should be 250 mm higher than the tank wall. The central pole is fixed in position by across of timber boards supported at the wall. It might be necessary to fix a second cross as formoulding the shutter, in such a way that the ends of the timber boards (or rather rafters) form anoctagon where they are supported at the wall. If this is achieved, segments of chipboard orblockboard should be cut as shown in Fig. 5.46. These trapezoidal pieces of timber are to besupported against the supporting understructure. A manhole of 450 x 450 mm must be made bynailing a frame of this size onto the shutter boards at the desired place. Reinforcement of the roofcan be performed with the rest of the reinforcement rods and fencing wire. This should be done insuch a way that the reinforcement rods fixed with binding wire to the vertical steel bars of the wallwill meet in the centre of the roof, where they are to be tied together. This reinforcement should becovered and tied to the fencing mesh. The extended mesh from the wall must be tied to the roofmesh.figure 5.45 figure 5.46figure 5.475.3.7 The roof concrete59