“The Courses and Recourses of History”
The Neapolitan philosopher Giambattista Vico (1668-1744) elaborated a theory on the history of mankind: the constant repetition of distinct cycles does not happen by chance but is predetermined and regulated by providence. This formation of thought is commonly known as the ‘Theory of Historical Courses and Recourses’.
In other words, the philosopher believed that events repeated themselves in the same way, at distances in time, not by chance but by pure design.
The new mobile XPRESS 2500 plant manufactured by MARINI in Alfonsine, Ravenna, is a clear example of this and here’s why …
The petroleum crisis of the 1970s was followed by the rapid development of the oil-producing nations which relaunched the building of roads and airports. To answer the need for frequent site movements, MARINI designed a 90-170 ton plant which could be easily erected with limited dependence on cranes.
In the following years, MARINI stopped manufacturing the mobile plant and followed market trends which favoured the so-called fixed-transportable plants. It concentrated on producing more traditional plants for permanent sites which did not have the problem of rapid installation and availability of cranes.
The recent economic crisis and long lasting stagnation of the European markets have led road builders to look for new work opportunities at home (but not necessarily near the traditional work place) and abroad.
So let’s get back to the recourses of history. Road constructors, having to face the lack of new projects on the home market, have shown an increasing tendency to take part in tenders for new road building in all corners of the world. For this reason there has been the preference to use easily transportable tyre-mounted plants, capable of fitting into the most difficult of logistic situations.
And the new MARINI XPRESS 2500 is the answer to this new requirement.
By taking advantage of past experience, combined with all the new techniques available on the most up-to-date plants, MARINI has created a unique plant in its category: a batch plant with high production (up to 200 tph), tyre-mounted for easy transfer, within the road transport limits (all 2.5 m, with main trailer 3m).
Cement foundations are not required; the ground is simply compacted to provide a satisfactory base for the metal bases on which the plant is then assembled.
The XPRESS 2500 plant requires no special lifting equipment. Some operations are performed with the help of a mechanical shovel, which is then used to feed the aggregates.
XPRESS 2500 has an incorporated hydraulic power unit which means the entire plant can be lifted and positioned for work in the shortest time possible using hydraulic cylinders.
The main frame, semitrailer on 3 axles, includes:
- 5 selection screen + direct discharge
- 5 + 1 bins under screen
- Aggregate metering unit and mixer (2500 kg/mix)
- Filler and bitumen weigh metering
- Hot elevator and recovered fines screw conveyor > hinged in centre, 90° rotation in work position
- Compressed air and control cabin
The standard XPRESS 2500 model has a unit of 5 mobile cold feeders mounted on a 2-axle semitrailer, each 11m3, with the option of pre-fitting RAP feed and the support divider for the mechanical shovel.
The dryer drum can produce 200 t/h with aggregates containing 3% moisture.
In keeping with the rest if the plant, the dryer is semi-trailer mounted on 2 axles
The burner and the connection channel to the bag filter are preassembled in the factory and ready for use.
Like all MARINI dryer drums, this dryer is fitted with RAP feed ring.
The frame is stabilized with 4 support legs and fitted with metal bases.
Various size dryers are available to suit all types of production.
The bag filter with over 660 m2 of filtering surface is mounted on a 2 axle semi-trailer which is within the road transport limits.
Incorporated underneath is the storage bin for the hot recovered fines
On the same frame the fan extractor is fitted together with the excess filler screw.
The semitrailer is fitted with support legs and metal work bases.
The aluminum chimney can be erected without the use of a crane.
XPRESS 2500 can be fitted with a wide range of options to suit production requirements: liquid and granular additives, modified bitumen emulsions for warm asphalt production and, on request, a production ramp for foam bitumen.
Discharge can also be made directly onto trucks or a mobile 20 m3 self-erecting deposit silo (2 axle semitrailer) can be supplied for the finished product.
With the XPRESS 2500 MARINI has added another pearl into its ample treasure chest of asphalt plants, which for more than a century has offered custom made solutions to even its most demanding clients.