Новости

PDN - a slab road tense.

Plates are used for construction in areas sraschetnoy air temperature of the coldest month to minus 55C.
PDN applied to engineering structures, but most often in the construction of pavement in difficult climatic conditions. Road plates PDN used in the construction of highways, runways time of temporary roads.
Road plates PDN calculated as
prestressed orthotropic structures on an elastic "vinklerovom" Based on
the equivalent ratio in the bed at least C = 10 kg/cm3 and relevant
foundation modulus E = 100 MPa for the calculation of regulatory load of
50 kN (5TS) at the wheel three-axle vehicle.in the calculation takes into account the
possibility of location on the plate one, two and four wheels (rear
bogie wheels of the car and two adjacent columns of cars) with a
coefficient of overloading NPER = 1.1 and coefficient of dynamic KG =
1,2.
PDN design tested for strength and crack resistance at the stage of stripping, shipment, installation and transportation.
In line with SNIP 2.03.01-84 p.1.13
dynamic coefficient of stripping, shipping and installation KG = 1,4,
transportation - KG = 1,6. In these cases, NPER = 1,0
Plates road meet the technical requirements of TU 35-871-89 "plates prestressed concrete road PDN and in this issue.
In the manufacture of heavy concrete slabs used in accordance with GOST 26633-85.
Strength of concrete should not be below the
design grade of concrete on the compressive strength of 27,5 and Design
class of concrete on the tensile strength in bending VBtb = 3,6.
Road plates PDN may have just two reinforced net. In this case, road plates can be used for the construction of temporary access roads to public roads (or special) purpose.