Roads are a layered strip structure. From the bottom to the top, it's divided into roads and roads. The basis is from the bottom to the top: the lower, upper and upper floors are divided into mats, grass-roots (subsidiary, grass-roots), surfaces (subsistence, meso-surface, upper layers)。
Luki usually means tupaci
The surface includes the ground and the surface
The roadbed is 0-80 cm from the roadblock
Roadway means 80 cm below luki, 150 cm below, 80 150 cm below. Dyke
The layers of surface direction directly bearing the load of the vehicle are generally asphalt concrete and cement concrete land
Below the grass-roots directional surface, above the roadbed, the structural layers are generally semi-rigid, but also flexible and rigid
Bottom base is the bottom base
The mat is laid between the grass-roots level and the roadbed, generally with gravel or gravel。
Extension:
Characteristics of road works:
High prices and high investment。
Investment in road construction projects is generally very large, and the value of construction contracts is essentially tens of millions, hundreds of millions or even tens of billions of dollars, which is incomprehensible for normal construction projects。
2, multiple points, long lines, wide surfaces。
Road construction is generally larger, ranging from tens of kilometres to hundreds to thousands of kilometres, and may involve more than one province, city and, in particular, the construction of major state roads, which generally spans more than a few provinces and cities and is quite extensive. Therefore, construction cannot be done by a single construction enterprise alone, and requires a number of cooperations, with points and segments。
3. High quality requirements and long lead times
Each road is unique and unique, and once built, it will not be repeated in a short period of time; at the same time, the construction of a road will cost considerable human, material and financial resources。
As a result, the construction time of road works requires stronger quality requirements for construction products, close cooperation between construction, design, construction and supervision units, coordination between the various sectors of materials, power and transport, as well as strong support from local government departments and relevant units along the construction line, and scientific rational use of resources to create as high quality road construction products as possible。
