I. Overview of the Project

This project is the first bid section A of Shuangpai-Hongshuiling Highway Project in expressway, Erguang, with a total length of 4.62km. This project adopts the standard of two-lane highway, and the calculated driving speed is 40km/h, and the overall width of subgrade is 8.5m. Each part of subgrade consists of carriageway width of 2 * 3.5m and soil shoulder width of 2 * 0.75m. The pavement structure is: 20cm thick unscreened macadam subbase and 20cm thick 5% water-stabilized macadam.

Second, resource allocation.

1, construction machinery

Name, quantity, model, use status and availability

1 PC 225 excavator is in good position.

Two ZJ50 loaders are in good position.

Bulldozer 1sd 160 is in good position.

Six dump trucks are in good position.

1 The sprinkler is in good position.

1 The vibratory roller is in good position.

2. Measuring instruments

Serial Number Instrument Name Specification Quantity Status Remarks

1 total station KTS 442R 1 intact.

Two sets of Class 2 DSC 532 are in good condition.

Three tower feet, five meters, two okay.

4 Steel tape measure 50m 1 intact.

5 steel tape measure 5M 5 will be fine.

3. Construction personnel

Number, job name and quantity (person)

1 Technician 2

2 surveyors, 2 surveyors

3 Tester 2

4 foreman 1

Five ordinary workers

6 safety officer 1

Third, the material requirements

Clean and hard macadam shall be used, with compactness of not less than 96%, CBR value of not less than 80% and macadam value of not more than 35%.

Grading composition of unscreened macadam

Item number (mm) 31.526.5199.54.751.180.60.075 Liquid limit (%) Plastic refers to (%).

Passing mass percentage (%)10090 ~10075 ~ 9050 ~ 7030 ~ 5515 ~ 3510 ~ 204 ~10.

Fourth, the construction method

1, construction preparation

(1), the surface of the road bed should be smooth and solid, with the specified road arch and compactness.

(2) Check the elevation and width of subgrade one by one.

(3) If the surface of the road bed is too dry, water should be sprayed appropriately.

2, construction lofting

(1) Restore the center line on the subgrade, with one pile for the straight line section 15~20m, one pile for the flat curve section every 10~ 15m, and indicator piles for the shoulder edges on both sides.

(2) Mark the design height of the edge of subbase and the design height of the top surface of gravel layer with obvious signs on the indicator piles on both sides.

3, gravel paving

(1) Unload the mixture evenly in the center of the road width, and then spread the mixture evenly with bulldozer according to the loose laying thickness. Follow the measuring instrument to ensure that the cross slope and elevation of gravel layer reach the design position. The compaction coefficient shall be determined by the test section. Manual paving should be 1.4~ 1.5, mechanical paving should be 1.25~ 1.35, and the paving width should be paved at one time according to the virtual paving thickness.

(2) Set up a team of six people behind the bulldozer to clear up the segregation of coarse aggregate in time. For coarse aggregate "nest" and coarse aggregate "belt", fine aggregate should be added and mixed evenly. For fine aggregate, coarse aggregate should be added and stirred evenly to keep the particles uniform and uniform in thickness, and repeated feeding is not allowed.

(3) When rolling the paved gravel, cut off the traffic and keep the paving layer clean.

4. Rolling

(1) After molding, when the water content of the mixture is equal to or slightly greater than the optimum water content, it will be immediately rolled by a 24t vibratory roller. Follow the principle of light before heavy, and the compaction thickness of each layer shall not exceed 20cm.

(2) Straight lines and flat curve segments without superelevation shall be rolled from both sides to the center, and those with superelevation shall be rolled from the inside out.

(3) When rolling, the rear wheels should overlap 1/2 wheel width, and the rear wheels must exceed the joints at both ends. When the rear wheel is pressed to the full width of the road surface, it is rolled again until the required compactness is achieved. Generally, it needs to be rolled for 6~8 times until there is no obvious wheel track on the surface, and the two sides of the pavement should be pressed for 2~3 times more.

(4) The rolling speed for the first two times should be 1.5~ 1.7km/h, and then 2.0 ~ 2.5 km/h..

(5) Sprinkle water properly before and during rolling.

(6) It is forbidden for the roller to turn around or stomp on the completed or rolling section.

(7) In the process of rolling, sealing materials shall be paved according to the cracks of compacted macadam.

5. Combined therapy

(1) The joints of two operation sections shall be overlapped and mixed. Leave 5~8m after the first section of paving without rolling. During the construction of the second section, the uncompacted part left by the first section will be mixed with the second section for leveling and rolling.

(2) longitudinal joints should be avoided. If the longitudinal joints cannot be avoided, the longitudinal joints should be overlapped and mixed, and the former should be compacted in the full width. When paving the latter, the edge of the adjacent former should be about 30cm, which should be dug and mixed, leveled and compacted together.

Verb (abbreviation of verb) quality requirements

1. The compactness of graded macadam subbase shall not be less than 96%.

2. The deflection value should not be greater than the design requirements.

3. The deviation of graded macadam subbase (elevation, flatness, width, thickness, cross slope) should meet the specification requirements.

4. Appearance quality, smooth and solid surface, no loose pumice and neat edges.