The traffic is convenient, conducive to the local and external material and personnel input and output, expand the exchange, gather local popularity, increase the city's fame, population growth.
And thus accelerate the local urbanization process, the various industrial sectors to have further development of the possibility of expanding the city's radiation range.
Road repair is mainly divided into five steps, the bottom of the road is generally called the roadbed, bearing layer, mostly gray soil replacement.
If there is water underground to do precipitation drainage clean, can not have open water, too wet need sand and pebble replacement.
① In the newly completed and acceptance of the lower bearing layer measurement to restore the centerline, straight line section every 20 ~ 25m set a row of piles, flat curve every 10 ~ 15m set a row of piles, and horizontal measurement to determine the thickness of grass-roots paving.
②Produce aggregate with forced mixer in the material yard according to the ratio approved by the supervising engineer, and the mixing should be done as follows: the soil should be crushed; the ingredients should be accurate; the water content should be slightly greater than the best water content; the mixing should be uniform.
③Paving
1. The mixture should not be stacked for too long, especially in the rainy season construction must do the same day stacked, the same day paving, shaping, rolling.
2. With a grader or paver according to the paving thickness of the mixture will be paved evenly, such as the discovery of coarse and fine particles from the phenomenon, the application of mechanical or manual supplement mixing.
④Compacting
1. After the rectification, the mixture in the best moisture content ± 1% when the rolling, such as surface moisture should be appropriate sprinkling.
2. Use more than 12t three-wheeled roller, heavy tire roller or vibratory roller in the full width of the roadbed for rolling.
Straight section, from both sides of the shoulder to the center of the road rolling.
Flat curve section, from the inner shoulder to the outer shoulder for rolling.
When rolling, the rear wheel should overlap 1/2 of the wheel width and must exceed the joints of the two sections.
When the rear wheel compacts the full width of the pavement, it is once, and the rolling is carried out until the required compactness. Generally, it needs to be rolled 6 to 8 times.
3. On both sides of the pavement, it should be pressed 2 to 3 times more.
It is strictly forbidden for the roller to turn around and brake sharply on the operation section.
⑤ The surface will be gently raked loose and sprinkled with water to wet the construction of cement crushed stone layer.
Cement fly ash stabilized gravel layer construction.
There are three main steps as follows
1. Mixing and transportation
2. Paving and shaping
3. Rolling
And to build a road in the desert, it is necessary to fix sand well on both sides of the road.
Traditional sand methods include physical and biological methods.
Physical sand fixation is to spray a kind of coagulant on the surface of the sand to make the sand solidify together and prevent soil erosion.
Another method is the sand tent, which is the most common method in the desert.
Sand tent is to insert sand willow poles and rice straws into the sand on both sides of the highway to make a diamond shape, and plant sand shrubs inside the sand tent, using sand willow poles and shrubs to block the wind and play a role in reducing the wind speed.
So that the wind speed does not reach the wind speed, and then achieve the purpose of weakening or even eliminating dust storms, so that the sand can not be blown to the highway by the wind.
