1
The efficient milling machines have made it possible to accurately respect both the prescribed milling depths and the narrow time window
2
For the base and Binder paving, after topographical positioning of the project sections, our technicians positioned longitudinal planar guide wires to follow when laying the new pavement.
3
In the basic and binder laying phase, the rubber rollers took on a leading role: immediately after the passage of the paver, they proceeded with the initial compaction
4
The Vogele asphalt pavers and Bomag Asphalt Manager rollers played the lion’s share in the laying phase of the base and binder asphalt mixes.
5
For a perfect laying of the base and binder layers, the paver was equipped with the 12 m Big Multiplex system with three laser sensors.
6
In addition to the quality of the machines, the good training of the teams of operators is also an essential aspect for the success of the project.
7
The study of the mixtures for the construction of bituminous conglomerates meeting the characteristics dictated by the Special Tender Specifications
8
The bituminous conglomerate used in the processing was entirely produced in the plant owned by Pesaresi Giuseppe S.p.A
9
The transport of the bituminous conglomerate was entrusted exclusively to road trucks with covered body, guaranteeing average travel times of about 30/90 minutes
Extension works of the 3rd lane from North Rimini to Pedaso
Supply and installation of bituminous conglomerates type 0/30 base
modified hard and binder 0/18 modified hard (High performance pavements)
Description of the intervention
DESCRIPTION OF THE INTERVENTION.
In June 2012, following a private negotiation, the Consortium Company SENIGALLIA S.c.a.r.l. assigned to Pesaresi Giuseppe SpA, the supply and installation of the bituminous conglomerates of the new motorway junction (Base 0/30 modified hard, 25 cm thick and Binder 0/18 modified hard, 5 cm thick) of Monte Marciano, together with the scarifying of the pavements existing.
Again with reference to the extension works of the 3rd lane from North Rimini to Pedaso on the A14 Bologna – Bari – Taranto motorway, located in the Senigallia – North Ancona stretch, Lot 4 from Km 194 + 800 to Km 213 + 789, in the month of September 2014, following a private negotiation, the paving works of bituminous conglomerates (Base 0/30 modified hard, 20 cm thick and Binder 0/18 modified hard, thickness 5) were entrusted by the Customer Consortium Samac to Pesaresi Giuseppe SpA cm) and scarification of existing pavements
In both interventions, the construction of the bituminous conglomerate pavement on the stretches of expansion of the motorway site took place on embankments – laying surfaces in mixed cement prepared by the Customer.
After topographical positioning of the road sections to trace the plan-altimetric dimensions of the new platform, before the laying of the bituminous conglomerate or simultaneously with the laying of the first base layer, our workers proceeded to install longitudinal guide wires positioned at the height of the binder, so as to create for the operator in charge of guiding-adjusting the paver, both a longitudinal and transversal dimension and direction reference, able to determine thanks to it, the thickness of the intermediate strips necessary to cover the ‘full width of the new platform, which in cases of fully asymmetrical expansion reached up to about 15.00 -16 meters.
The road package for the project bituminous conglomerate, provided for a 0/30 base layer with hard modified bitumen of the total thickness, followed by the laying of two layers, taking care to offset the longitudinal joints by varying the width of the single strips. The spreading took place on several layers in order to guarantee the correct compaction of the conglomerate and to guarantee the achievement of the percentage of voids declared in the prequalifications. For this purpose, the rolling of the conglomerate takes place through the simultaneous use of a static rubber roller brand Bomag BW27RH weighing 24 tons. and a vibrating iron roller brand Bomag BW174AD weighing 10 tons.
Before the execution of the second base layer, and of the binder, the attack coat was made by spreading acidic bituminous emulsion, then proceeding to trace the exact thicknesses missing to reach the expected thickness, identifiable by using transverse wires referring to the traced sections.
The laying of the binder took place by means of a single layer of the minimum projected thickness of 5 cm, longitudinally following the yard tracing threads, and transversely the dimensions further traced on the last base layer, between the individual strips, in order to correct any slight depressions and / or imperfections on the underlying layer, always paying maximum attention to the offset of the longitudinal joints. During the laying of the binder, the containment edge in bituminous conglomerate was created, where necessary, about 10 cm wide and about 15 cm high.
By means of padding, the existing road section was raised and re-profiled. These were organised by the client in several phases compatible with the progress of the work, in day and / or night work shifts. In the case of temporary paddings subject to opening to vehicular traffic, or in any case each time conglomerate floors made at different times are joined, the previous paving has been scarified in order to revive, clean and homogenise the point of attachment between the new and old bituminous conglomerate.
Below, the most characterising elements of both the contracts described above are reported by points:
Intervention specification
WORK TITLE:
Extension works of the 3rd lane from North Rimini to Pedaso on the A14 Bologna – Bari – Taranto motorway, located in the Senigallia – North Ancona section. Lot 4 from Km 194 + 800 to Km 213 + 789. Construction of the New Junction in the Monte Marciano area – Supply and installation of bituminous conglomerates type 0/30 base modified hard and binder 0/18 modified hard (High-performance pavements)
CONTRACTOR:
Company “AUTOSTRADE PER L’ITALIA S.p.A.”
CUSTOMER:
Consortium Company SENIGALLIA S.c.a.r.l.
AUCTION CRITERION OF WORKS:
Work in subcontracting
CONTRACT AMOUNT:
€ 3.896.971,25
WORK CATEGORIES:
OG3 € 3.896.971,25
START DATE AND FINISH DATE OF WORKS:
June 2012 – February 2013
WORK TITLE:
Extension works on the 3rd lane from Rimini north to Pedaso on the A14 Bologna – Bari – Taranto motorway, located in the Senigallia – Ancona north section. Lot 4 from Km 194 + 800 to Km 213 + 789. Supply and installation of bituminous conglomerates base type 0/30 modified hard and binder 0/18 modified hard (High performance pa).
CONTRACTOR:
Company “AUTOSTRADE PER L’ITALIA S.p.A.”
CUSTOMER:
Stable Consortium SAMAC
AUCTION CRITERION OF WORKS:
Work in subcontracting
CONTRACT AMOUNT:
€ 21.373.210,95
WORK CATEGORIES:
OG3 € 21.373.210,95
START DATE AND FINISH DATE OF WORKS:
September 2014 – June 2016
