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Road reconstruction project
Design documentation for the reconstruction of the road
The main technical and economic indicators
Road-climatic zone - D.
The climate of the region is sharply continental with long frosty winters and short but relatively warm summers.
Regulatory seismicity of the construction area - 8 points (SNiP 11-7-81 * "Construction in seismic areas").
The estimated winter temperature of the outside air (the average of the coldest five-day period with a probability of 0,98) is minus 44 ° С (SNiP 23-01-99 "Construction climatology").
The estimated winter temperature of the outside air (the average of the coldest five-day period with a probability of 0,92) is minus 38 ° С (SNiP 23-01-99 "Construction climatology").
The absolute minimum outdoor temperature is minus 57,0 °С.
The absolute maximum outdoor air temperature is plus 30,0 °C.
The technical category of the section of the highway is IV (SNiP 2.05.02-85 "Automobile roads").
The estimated speed of vehicles on the site is 80 km/h.
The number of traffic lanes - 2.
The width of the carriageway on the site is 6,0 m.
The width of the subgrade on the site is 10,0 m.
The width of the curb on the site is 2,0 m.
Road clothes.
The project provides for the construction of a transitional type pavement, a base of gravel-sand mixture C6 and a coating of gravel-sand mixture C1 with the addition of 30% crushed stone. The required modulus of elasticity of the structure for transitional type pavement is 100 MPa. In the project, two options for the design of the pavement were considered and proposed to the customer: Option 1: Covering - gravel-sand mixture C1 with the addition of 30% crushed stone I = 0,15 m; Base - gravel-sand mixture C6 according to GOST 25607-2009 1: = 0,20 m; Option 2: Coating - crushed stone-sand mixture C1 according to GOST 25607-2009 1: = 0,15 m; The base is a crushed stone-sand mixture C6 according to GOST 25607-2009 1 = 0,15 m. A technical and economic comparison of pavement design options was carried out, taking into account the construction cost, repair and maintenance costs for the period of operation. Option 1 turned out to be the most economical, agreed with the customer and accepted for design. Cross drainage is provided by the transverse slope of the carriageway and roadsides.