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Communication Dans Un Congrès Année : 2008

Behaviour of a new concept of gas pipe trenches under heavy traffic loading

Résumé

Gaz de France, the French consortium for gas distribution and the ETDE Company have developed a new concept of trench for gas pipes. It consists of a thin trench 10 a 13cm width and about 50cm high, filled with a self-placing concrete in which the polyethylene gas pipe is directly placed. The upper part is made of 5 to 8 cm of asphalt concrete, in continuity with the pavement surface layer in which the trench is constructed. This new concept has the advantages of quick construction and low excavation volumes. It should replace in the future the classical gas trench, 40 or 50 cm width and at least 70 cm hight, filled with unbonded graded material and bituminous concrete, in which the gas pipe is embedded in sandy materials. In order to verify the behavior of this new gas trench under heavy traffic loads, a fatigue experiment has been realized in 2003 by mean of the LCPC's ALT facility. The bituminous pavement of the ring C of the fatigue test track has been equipped by five trenches using the new concept, with different heights from 40 to 80 cm. A classical trench has also been constructed. Five trenches, 3 meters long, were transversal to the ALT traffic, and one of them, 6 meters long, was longitudinal. The polyethylene pipe diameter was 63 mm. The auto-placing concrete was equipped by strain gauges and displacement sensors, and the gas pipes strains were also monitored. The measures were done during the construction phase (concrete pouring effects), and during the whole fatigue experiment (dynamic traffic effects). This paper presents the main features and the result of this experiment, leading to a very encouraging conclusion for what concerns the behavior under heavy traffic loads of this new concept of gas trench in pavement.
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Dates et versions

hal-00379496 , version 1 (28-04-2009)

Identifiants

  • HAL Id : hal-00379496 , version 1

Citer

Jean Maurice Balay, M. Hardy, Jean Pierre Kerzreho. Behaviour of a new concept of gas pipe trenches under heavy traffic loading. 3rd International Conference APT'08, Oct 2008, France. 8p. ⟨hal-00379496⟩
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