Articles published in the issue 05, 2016

Test-Bench Researches Of Pneumatic Measured Shovel-Packing Of Riprap Under The Sleeper

Keywords: test bench, lifting, pneumatic measured shovel packing, finely-crushed stone, supply rate, distribution of finely-crushed stone.

Krasnov Oleg — Ph.D, Head of Track and Special Rolling Stock Department, Joint Stock Company «Scientific-Research and Design-Technology Institute of Rolling Stock», е-mail: krasnovog@mail.ru

Nozdrachyev Gennadiy — Head of Testing Laboratory of Track and Special Rolling Stock Department, Joint Stock Company «Scientific-Research and Design-Technology Institute of Rolling Stock», е-mail: nozdrachyov.gennady@yandex.ru

Stebletsov Vladimir — Deputy General Director for Technical Policy, Limited Liability Company «Engineering Service - Putmash», е-mail: stebletsov.vi@yandex.ru

Abstract. The article presents the results of bench tests of a model sample of pneumatic measured shovel packing. The studies are conducted on the model sample of the pneumatic measured shovel packing working body on a specially designed test bench.

Dependences of crushed stone supply rate to the sleeper crib area at different initial conditions are established: for a finely-crushed stone with a particle size distribution of 5...10 mm and 10...20 mm, air pressures from 0,2 to 0,8 MPa with a step of 0,2 MPa, air input to a chamber feeder zone and at simultaneous inputs to the chamber and nozzle zones.

The actual liftings of sleepers are defined after a static pressure with a force of 25 ton/force for different values of its initial lifting.

The distribution of the given finely-crushed stone is investigated under sleepers from the modes of air feed and an initial lifting value.

It is shown that the delivery speed of the finely-crushed stone significantly depends on sleeper lifting, installation sites of feeders and sequence of their operation.

The actual lifting of sleepers at the pneumatic measured shovel packing functionally depends on its initial lifting, a portion of the given crushed stone, particle size distribution of the finely-crushed stone.

Distribution uniformity of the finely-crushed stone under sleepers is defined by conditions of its discharge and an operating mode of feeders. The finely-crushed stone is distributed rather evenly over the whole sleeper bed at an initial lifting of sleepers by 30-40 mm and consecutive operation of feeders.

The conducted studies confirmed a fundamental probability of level restoration, elimination of distortions and lowerings using a pneumatic measured shovel packing method.