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After the construction of the cement mixing pile pile cap is completed and the soil backfill between the piles is completed, the gravel cushion is filled in the upper part, the cushion thickness is 5 divided into two layers of filling and compaction, and a layer of two-way geogrid is laid in the middle of each layer of 2 cushions, and the slope slope ratio is 1:1.5.

The crushed stone for the cushion should be made of unweathered clean gravel or rolled gravel, with good gradation, and no plant residues, garbage and other debris.

Lay geogrid in the cushion, first lay a layer of 0.25 gravel cushion, roll compact, lay a layer of geogrid on it, fold back 2.0 at both ends and then lay 0.25 gravel cushion, and then build the upper part of the fill after rolling and compacting (K30≥110A/).

Before the geogrid is laid, a white line is drawn on the paving layer according to the width, and then the end of the grid is fixed with U-shaped iron nails. After fixing the ends, use the paver to slowly pull the grille forward. Each 10-metre-long shop is manually tightened and straightened once until one roll of grating is laid, and then the next roll is laid. After laying a roll, roll it over with a roller. Lap between the grille and the grille 10~1

6.3.2 Construction technology and requirements

Packing requirements

The filler below the embankment bed is filled with group A and B filler or improved soil, and the thickness of each layer of filler is not more than 300 after compaction. The thickness of the compacted layer that fills to the last layer of the top surface of the roadbed is not less than 100, and the filling and filling section is paved and smoothed with a bulldozer or grader according to the grid distribution, so that the filling layer is smooth and uniform in the longitudinal and transverse directions, so as to ensure that the surface of the roller roller roller can be basically evenly touched with the layer for compaction, so as to achieve the best rolling effect.

The surface layer of the positive line base bed is group A filler, and the maximum particle size of the filler is not more than 1, and the bottom layer of the base bed is group A and group B filler, and soil improvement or reinforcement measures are taken for the filler that does not meet the requirements. The maximum particle size is not more than 2 or 2/3 of the paving thickness. The basic body of the road is gravel, gravel and block stone in the packing of group A and group B filler, and the maximum particle size is not more than 3 or 2/3 of the paving thickness;

The surface layer of the station line bed is a group A and B packing. The maximum particle size of the filler is required to be no more than 1, and soil improvement or reinforcement measures are taken for the filler that does not meet the requirements; The bottom layer of the foundation bed is group A and group B packing (the plasticity index shall not be greater than 12, and the liquid limit shall not be greater than 32%), and the packing materials that do not meet the requirements shall not be met. Soil improvement or reinforcement measures should be taken, and the maximum particle size should not be greater than 2 or 2/3 of the paving thickness. The basic body of the road is gravel, gravel and block stone in the packing of group A and group B filler, and the maximum particle size is not more than 3 or 2/3 of the paving thickness;

Basic construction principles

After the surface has been treated in accordance with the design and relevant specifications. First of all, the construction of the test section is carried out, after obtaining the construction parameters, the construction is carried out in strict accordance with the principle of "from low to high, longitudinal segmentation, and horizontal layering" in accordance with the filling, and the embankment below the foundation bed is strictly organized in accordance with the "three stages, four sections, and eight processes".

Filling method

The roadbed is excavated by excavator, the loader is loaded with the excavator, and the dump truck is transported. Bulldozer paving and initial leveling, grader precision leveling, vibrating roller rolling, manual trimming slope.

Construction process

1) Layered filling

The embankment filling adopts the full width of the cross section and the longitudinal segmentation for layered filling. In order to ensure the compaction of the subgrade, the thickness of the loose paving must be controlled by 90% of the thickness of the subgrade fill in the test section, and the thickness of each layer of loose paving is not more than 3 after compaction, and the thickness of each layer is about 2 during the construction of the erection of the ruler rod at the shoulder position to control the paving thickness, and each layer of filling is in place at one time according to the thickness of the loose paving, and the unloading is commanded by a special person. If the ground has a slope. Layered filling is carried out from the low place, and the ground cross slope is steeper than 1:10 on the slope must dig steps, and the digging steps need to be carried out from top to bottom, and the width of the longitudinal steps along the line is not less than 2 and leveled and rolled. Which design to choose, is to change the environment, illegally cross the Dadu River, the economy is more profound, and the feeling is affirmative, the telephone exchange, hahahaha, the division and merger, the urgency, the urgency, the ancient times

2) Paving leveling

At the same time as unloading the soil in the filling section, the grader is used to level it, and attention should be paid to the road crown that is set up in each layer according to the requirements. After the bulldozer completes the bulldozing of a section, the scraper is used to level it, and at the same time, the pit is filled with manual cooperation to ensure the quality of compaction. The height of the fill is greater than 6 and less than 15, and the subgrade slope is laid in accordance with the requirements of the drawings within the horizontal range of 0.6 and the embankment slope from the surface to the surface of the foundation bed.

3) Sprinkle water to dry

Before the filler is rolled, the water content is tested, and the water content is controlled within the allowable water content of the construction, and then the rolling is carried out. When the moisture content of the filler is low, take sprinkling measures, and in winter, it must be sprinkled at noon when the temperature is relatively high, and it is strictly forbidden to sprinkle when the temperature is low. When the water content is too large, the method of digging and drying in the soil extraction site can be adopted to reduce the water content.

4) Rolling and tamping

According to the layered construction drawings and different filler conditions, select the appropriate rolling machinery, and the heavy-duty vibrating roller is used for the filling compaction operation, and the excitation force of the roller is 25~50t. The rolling sequence is rolled backwards from both sides to the middle, the curve section is first inside and then outside, the transverse joints overlap 0.5 or about one-third of the wheel width, and the front and rear adjacent sections overlap 1.

According to the type of filler, the thickness of the filler and the standard of compactness, the number of compaction times obtained in the test section is controlled. First static pressure 2 times, then vibration pressure, in general, the number of vibration compaction times: 6~8 times for the surface layer of the roadbed, 5~6 times for the bottom layer of the roadbed, and 4~5 times for the basic body of the road. For compaction near the slope, the shoulder is preliminarily compacted by a bulldozer to the shoulder without landslide, and then the roller is used to roll it. The outer wheel flange of the roller is kept 3 right from the edge line of the overfilled roadbed to ensure the safety of the roller. For the places where the roller should not be rolled, a small tamping machine is used to tamp it.

5) Test visa

Before sampling or testing, the tester should ensure whether the filler meets the requirements, whether the rolling section is compacted evenly, and whether the thickness of the filling layer exceeds the specified thickness. The quality inspection of subgrade fill compaction is detected with the layered filling and rolling construction. On the basis of the quality of the filler, the thickness of the filling, the uniformity of the longitudinal and horizontal direction of the filling layer, etc., the sand filling method and the K30 load plate are used to determine the compaction coefficient and foundation coefficient of the fine-grained soil, and the coarse-grained soil and gravel soil are tested by the K30 load plate and the nuclear densitometer, and the next layer of filling is carried out after reaching the specification and design standard.

6) Subgrade refurbishment

After the embankment is filled according to the design elevation, it is repaired and measured. Restore the middle line, every 20 piles, carry out horizontal elevation measurement, calculate the trimming height, cast shoulder side piles, build road arches, and roll them again with a flat roller, so that the roadbed surface is smooth and clean without floating soil, and the transverse drainage slope meets the requirements. For the fine-grained soil slope, according to the shoulder edge line pile, the overfilled part is brushed with a hanging line according to the design slope rate, and the renovation is carried out. After the renovation, the slope reaches the turning point with obvious ridge lines, straight lines, and smooth changes, so that the slope surface is smooth and there is no concave and convex, and the compaction density is qualified.

The renovation includes the drainage cross slope, flatness, slope and other renovation contents of the subgrade surface, and the subgrade renovation is carried out in strict accordance with the design structure size to meet the requirements of technical standards. Slope trimming release subgrade edge line pile, according to the requirements of the design specification, for the widening part of the artificial hanging line brush to overfill part, trim the vertex, trim the turning point to reach the edge line obvious, straight line, curve smooth.

(1) Scope of construction

The DK16179.33~DK16625.53 section is reinforced with one-way cement mixing piles, with a pile length of 79, a pile diameter of 0.5, and a pile spacing of 1.3 square layouts.

The DK16642.49~DK18291.8 section is reinforced with one-way cement mixing piles, with a pile length of 911, a pile diameter of 0.5, and a pile spacing of 1.3 squares. The DK18291.8~DK18321.8 section is reinforced with two-way cement mixing piles, with a pile length of 12, a pile diameter of 0.5, and a pile spacing of 1.3 square layouts.

The roadbed of DK26592.24~DK26622.24 is reinforced with multi-directional cement mixing piles, with a pile length of 12, a pile diameter of 0.5, and a pile spacing of 1.3 squares. The roadbed of DK26622.24~DK26973.32 is reinforced with multi-directional cement mixing piles, with a pile length of 11, a pile diameter of 0.5, and a pile spacing of 1.3 squares.

The DK27218.18~DK27536.64 section is reinforced with one-way cement mixing piles, with a pile length of 11, a diameter of 0.5, and a spacing of 1.3 squares. The DK27536.64~DK27650.00 section is reinforced with one-way cement mixing piles, and the specific pile length is 0.5 accurate to drive into the sandstone, and the pile diameter is 0.5 and the pile spacing is 1.3 square layout.

The DK28071.25~DK28101.25 section is reinforced with one-way cement mixing piles, with a pile length of 6, a pile diameter of 0.5, and a pile spacing of 1.3 squares.

The DK28228.85~DK28962.62 section is reinforced with one-way cement mixing piles, with a pile length of 67, a pile diameter of 0.5, and a pile spacing of 1.3 square layouts.

1) Do a good job of the construction site of the three links (road pass, water pass, electricity pass) one level (remove the obstacles on the construction site), find out the location of the underground pipeline and determine the location and height of the overhead wire; Do a good job in the drainage of the construction site, dig temporary drainage ditches on both sides of the road, and ensure that there is a 4% lateral drainage slope, and harden the cement pavement of the main road in the construction site, so as to form an overall smooth road.

2) The cement mixing pile must be qualified 42.5 grade ordinary Portland cement. Before use, the sample of cement is sent to the central laboratory or the laboratory designated by the supervising engineer for inspection;

(3) Construction process

Pile lofting→ drilling rig in place→ checking, adjusting the drilling rig → opening one, two, three (to be continued.) )