Putzmeister's innovations in boom substructures and optimised concrete placing booms as well as delivery outputs through piston pumps and boom control systems will be on view in Hall B6 of bauma 2001.

Highlighting the enhancements made on the boom substructures to various models including the M 36, the M 52 and the M 46, a spokesman for Putzmeister says: ''One of the latest innovations is the M 36 'Z folder' which has superseded the previous Putzmeister M36 'roll folder' that was the most solid boom worldwide in the 30 m class, says a spokesman for Putzmeister.

"The easy-to-operate Z fold enables the highest degree of flexibility and the consequent utilisation of the net reach under jobsite conditions. Concreting almost right up to the driver's cab is possible with those boom kinematics.

''Putzmeister also placed great importance on a delivery line made out of standard pipes and pipe elbows so as to simplify the storage of the typical wear parts for the customer and to lower the costs. Including accessories, the total weight of the Z folder on a standard three-axle chassis lies below 26 tonnes.

''The Putzmeister long-reach M 52 is ranked as the top model in the King's Class which was introduced in 1986. The essential novelties of this large boom pump are both the weight-optimised concrete placing boom with the well-proven five-arm Z-fold and also the newly-developed substructure.

''The substructure of the M 52 is outstanding due to its position-alterable diagonal support. The diagonal support offers undisputed advantages on site and has to date only been realised for the up to the 40 m class.

''Putzmeister has also completely redeveloped the boom substructure with a diagonal support for the M 46. In contrast to its predecessor, the front support no longer needs a lot of space to swing, but can be telescoped directly out of the carrier chassis and straight onto the actual support surface.

''The long-reach boom pump thus requires considerably less free space to be set up. The machine is also remarkable because of an optimum axle load distribution. Thanks to the compact dimensioning, the truck-mounted concrete pump with a 46 m placing boom is extremely manoeuvrable and job-site friendly (no overhang at the rear!). Due to the weight-optimised design, the machine can be set up on a standard, that is, favourably-priced four-axle chassis.

Turning to concrete placing booms, the spokesman says: ''With the M 42, Putzmeister sets standards for the 40 m class. This long-reach machine is also equipped with a space-saving front diagonal support (support width only 8 m) and is offered on a standard four-axle chassis. Due to the compact substructure, it is also possible to assemble the M 42 on trucks with average-long, operator-friendly driver's cab. The machine has a GVW of below 33 tonnes. With the large-volume and very-quiet-running concrete pump (stroke 2,100 mm, delivery cylinder diameter 280 mm), the M 42 offers an especially high cylinder filling rate with low wear and a concrete pump performance of up to 200 cu m/h.''

''At bauma, Putzmeister is exhibiting a multi-functional concrete placing boom which - when combined with a truck-mounted concrete pump - is suitable for mobile use and can also be operated in the stationary mode from a tubular column. A quick-release connection makes it easier to move the boom from the vehicle to the column. As the arm assembly of the multi-boom M 28 weighs only 4.4 tonnes, it can easily be moved by standard construction-site cranes. The carrier vehicle is a truck-mounted concrete pump that is specially designed for high delivery pressures (up to 130 bar) and high pump outputs (up to 160 cu m/h).''

Putzmeister will be focusing on just what is possible technically and what is sensible economically for pump technology with the enormous double piston pump KOS 25200, says the spokesman.

''The machine displayed in Munich will then be used in Japan as a high-density solids pump to reclaim land. What is especially impressive is the pump's performance and technical data: