In inset application, the concrete is either deposited right in front of the slipform paver or is fed in front of the machine from the side via a belt conveyor or side feeder. In the next step, the concrete is distributed evenly across the full paving width by a spreading auger or spreading plough. Homogeneous compaction of the concrete is effected by means of integrated electric or hydraulic vibrators. The inset mould forms the concrete slab to the specified thickness and width while the slipform paver advances. In addition, a dowel bar inserter can be integrated which inserts the dowel bars into the concrete as specified parallel to the paver’s direction of travel. Central tie bars or side tie bars can be inserted transverse to the concrete pavement. The surface is levelled off transverse to the paver’s direction of travel by the oscillating beam. The “grinding movement” produces a small concrete roll in front of the beam which adds to the high quality of the concrete surface. In the next step, a super smoother is used to finish the concrete slab.
In offset application, mixer trucks deliver the concrete into the receiving hopper of the slipform paver. Transport to the mould is effected via a slewable belt or auger conveyor. Depending on the paver model, the belt conveyor is available in different lengths and in folding design. The auger conveyor is also available in different designs. And whether belt or auger conveyor: all settings, such as conveying speed, angle of incline or position can be made at the mere push of a button. A separate cross-feeding auger offers numerous advantages. The mixer truck can drive right in front of the slipform paver, thus eliminating the need to close off additional traffic lanes. The cross-feeding auger is the ideal solution also whenever larger volumes of concrete are required as a material buffer, for example, when paving in narrow bends where it is not possible for the mixer truck to continue the uninterrupted delivery of concrete to the slipform paver.
As trucks or semi-trailers keep discharging concrete into the large receiving hopper of the conveyor unit, the conveyor transports the material to the centre of the concrete slab to be paved. The ISF 94 / ISF 94i side feeder then spreads the freshly delivered concrete by means of the integrated spreading auger and, without compacting it, places it at a smaller width but larger thickness than the slipform paver following behind. The slipform paver places the concrete at the specified width and layer thickness together with the previously laid steel reinforcement. In a final step, the texture curing machine creates a defined surface texture and sprays a curing compound on the freshly paved concrete surface.
Operating principle of a paving train including the ISF 94 / ISF 94i: Concrete delivery truck, ISF 94 / ISF 94i side feeder, SP 94 / SP 94i slipform paver and TCM 180 / TCM 180i texture curing machine