2005 - Putzmeister

TechnologyFlexible 20 m "quad" – Universaltruck-mounted concrete pump withan unfolding height of just 3.9 mWith its new M 20-4 ZR model,Putzmeister AG has extended its range ofcompact truck-mounted concrete pumpswhich can be used even in the narrowestof spaces. What is particularly noticeableabout the machine is the boom which isfolded four times according to the "Z rolland fold" principle. Previously, this boomfolding type was only used on largertruck-mounted concrete pumps, e.g. forthe type M 24-4 ZR.It is easy to tell which concreting tasks thenew M 20-4 "Z roll and fold" was designedfor, with its boom folding principle andlow truck height. Primarily, it is intendedfor construction sites which could not previouslybe operated with standard truckmountedconcrete pumps. For example,narrow back yards in residential andindustrial areas as well as rooms that arelower than 4 m high. The sites in questionalso include construction and refurbishmentprojects in low buildings, tunnels or underpasses.Of course, normal constructionsites can also be operated with the foldingboom. For in concreting work in high construction,the 20 m boom is excellently suitableas a pipe bridge which – practicallywithout any loss in vertical reach – cansnake horizontally up to the 6th storey(usual floor height approximately 2.7 m)and be fed through windows or other opening,even the smallest of brickwork openings.The unfolding height of the new "quad"M 20 ZR is just 3.9 m. In addition to thespecially developed placing boom, thenewly designed base structure also takesinto account the latest findings fromweight-optimised steel construction. With afront support extent of just 3.2 m (rear withinthe vehicle width of 2.5 m), the compacttruck-mounted concrete pump can be supportedand unfolded in even the narrowestof passageways. In short – the space requiredto support the M 20-4 is not greater thanthe area that the machine takes up when thedriver's door is open.38"Quintuplet" adapts itselfA large boom pump with a particularly flexibleplacing boom was required in the carcassof the new EL CORTES INGLESshopping centre in Spanish Castellón. Awide and deep bottom plate with five basementfloors also had to be concreted, inaddition to the long underground parkingaccess and the spacious floor areas. Due tothe narrow space conditions around the OldTown, the position for setting up themachine had to be considered in greatdetail. The contract for placing the concretewas awarded to the GRUPO TELEBOM-BEO pump service provider, which used anew Putzmeister BSF 52.16 H for manyweeks at this construction site.Building constructionOur photo shows the machine during concreteplacement on the fifth storey aftermachine operator Alfredo Muñoz had integrated100 m 3 of concrete in the undergroundparking area of the future shoppingcentre a few hours previously. It is easy tosee how the boom of the M 52 "quintuplet"can adapt to the building structure withoutwasting any horizontal reach: first, the "A"and "B" arms are used to reach the requiredbuilding height. Then the length of arms"C", "D" and "E" is available as a horizontalworking range.40372,5 m3,2 mOur illustration clearly shows the narrow conditionsunder which the M 20-4 placing boom can be used(passageways, back yards, etc.).The extremely flexible concrete boom hasa 125 mm delivery line as standard, in aparticularly hard-wearing, 2-layer design.The core pump recommended byPutzmeister is an aggregate with a 1,400 mmstroke and 230 mm delivery cylinder Ø,which is designed for delivery rates of upto 90 m 3 /h or pump pressure up to 78 bar.Delivery will begin in spring 2006.The short wheelbase of just 4.5 m ensuresan extremely small turning circle. With apermissible gross weight of less than18 tons for the 2-axis chassis and an actualtare weight of approximately 15 tons(depending on the vehicle), the M 20-4also has significant weight reserves. Thisenables the small "quad" to carry additionalhoses and pipes, meaning that the workingrange of the machine is significantlyextended.39Horizontal reach 16.1 mVertical reach 19.5 mUnfolding height3.9 m14PM 3723 GB15PM 3723 GB