The advantages of concrete vertical walls MacRes System in urban areas

Transcription

1 concrete vertical walls MacRes System in urban areas Mr Giuseppe Lembo Eng. Corporate Specialist Vertical Walls MACCAFERRI Mr Taulant Alilanj Msc Eng. MACCAFERRI BALKANS

2 VERTICAL REINFORCED EARTH SYSTEM WITH FRONT FACE MADE IN CONCRETE PANELS.A FAST DESCRIPTION The system consists of a soil reinforced with linear high adherence reinforcements placed in the soil in successive layers and connected to a flexible facing made of concrete panels. The principle of operation of the system is based on the interface friction between linear reinforcements and the structural filling soil. That means that the most important factor for the design is the structural filling soil and in particular the friction angle value. Lengths, dispositions and number of the reinforcements are designed according to the earth pressure of the backfill soil and of the in situ soil and according to the eventual overloads that insist on the reinforcements and on the back of the reinforced structure: the reinforcements are determined basing on the tensile stresses transmitted to the structural soil for effect of the interface friction. To adapt to the specific characteristics of each project, the system offers the option of using either steel reinforcements than polymers with different strengths for greater efficiency. All are, high adherence and their characteristics permit the construction of structures, including very high and still highly charged. GEO-ENVIRONMENT AND CONSTRUCTION

3 REINFORCED EARTH SYSTEM ELEMENTS FRONT HIGH ADHERENCE FACE REINFORCEMENTS REINFORCED SOIL MASS LEVELLING PAD

4 ADVANTAGES Worldwide known System Fast Installation Low cost compared to traditional structures Minimum space required Panels with different architectural finiture Not required previous experience for installation

5 POSSIBLE APPLICATION Road and Highway Railways Airport Quarry Parking area Bridge Abutment Tiered Walls

6 GEOSYNTHETIC REINFORCEMENT - PARAWEB ParaWeb strips are planar structure consisting of a core of high tenacity polyester yarn tendons encased in a polyethylene sheath. MAIN FEATURES: Nominal resistance from 30kN to 100kN The lenght of the rolls is of 100ml The tensile nominal strength is printed on each roll No susceptibles to corrosion High durability Easy trasportaion, handling and installation High interaction with soil

7 HOW CAN I CONSIDER PARAWEB AS INEXETENSIBLE REINFORCEMENT? A reinforcement is inextensible when it sustains the design loads at strains less than or equal to 1%. The elongation at maximum load at failure for all grades of Paraweb strap covered by BBA Certificate is 12% ± 1%. But this is simply theory because in reality Paraweb reinforcement works far from the nominal tensile strength. Considering all the reduction factors (creep, durability/environmental, extrapolation of data, ramification of failure), the value assumed in calculation is closer to 65% of the nominal tensile strength.

8 JOBSITE EXPERIENCE ARLUNO (MI) - ITALY General details LOCATION: Arluno (MI) CLIENT: CAVTOMI ENGINEER: Officine Maccaferri PRODUCTS USED: MacRes 3400 mq BEST FEATURE: height max MacRes 8,91m PROBLEM DESCRIPTION: New overpass for bicycle with limitated width and current strain CREW (people): 3 foreman + 1 crane operator PRODUCTIVITY (mq/day): mq/day

9 JOBSITE EXPERIENCE KEMPEN BELGIUM General details LOCATION: Kempen CLIENT: JAN DE NUL ENGINEER: Officine Maccaferri PRODUCTS USED: MacRes mq BEST FEATURE: height max MacRes 14m PROBLEM DESCRIPTION: New highway using treated soil with lime CREW (people): 3 foreman + 1 crane operator PRODUCTIVITY (mq/day): mq/day

10 Thank you for your kind attention