PNEUMATIC ROLLER TO FLATTEN GROUNDWORK BASE Russian patent published in 2010 - IPC E01C19/26 

FIELD: construction, road engineering.

SUBSTANCE: invention relates to machines for accelerated preparation of groundwork bases in process of winter roads arrangement on swamps, namely to machines used to flatten frozen swampy groundwork bases in Northern conditions. Pneumatic roller used to flatten groundwork bases comprises frame of the first and second stage connected to each other by means of hinged joint, which is used to provide for free rotation of the first stage relative to the second one in process of turns. The first stage is a single-row pneumatic roller, and the second one is a three-row pneumatic roller with pneumatic wheels installed on axles in staggered order so that strips that remain non-flattened with pneumatic wheels of the first row are flattened by pneumatic wheels of the second row, strips that remain non-flattened after passage of pneumatic wheels of the second row are flattened by pneumatic wheels of the third row, and strips that remain non-flattened after passage of the third row pneumatic wheels, are flattened by pneumatic wheels of the fourth row. As pneumatic wheels are installed, the condition shall be observed so that distance between pneumatic wheels is less or equal to half of pneumatic wheel width. Required pressure P at axis of pneumatic roller with specified depth of pneumatic wheels submersion of h, bearing capacity [σ] of peat swampy groundwork base, width of pneumatic wheels B, their number on a single axis n, half of central angle α and coefficient k, which exceeds permissible bearing capacity of swampy surface, is determined by dependence P=B·(R-h)·tgα·n[σ]·k; hydraulic engines are installed on all four axles of pneumatic roller. In front of the first stage of pneumatic roller used to flatten groundwork bases of motor roads there is a planner-leveler installed with the help of hinged joints and hydraulic cylinders. On the frame of the second stage there is equipment installed to generate electric energy, as well as equipment for hydraulic drive and device for adjustment of pressure in tyres.

EFFECT: invention provides for efficiency of flattening process.

1 cl, 6 dwg