Grade 2 and below and the laying of low-grade road in the steep hillside section of the construction of particularly difficult or a large number of blasting to move digging for filling, can be used to fill the way to fill, but the road bed is not less than 1.0m range Should be layered filling compaction. Gravel embankment of expressways, first-class highways and other grade roads with high-grade pavement shall be filled with layers, and shall be stratified and compaction. The thickness of layers shall be determined according to the type of rocks. Thickness of loose pavement can be selected according to Table 2. As can be seen from the table, the hardest rock crushed stone embankment of the largest loose thickness of about 60cm in general, the maximum particle size does not exceed the layer thickness of 2/3, that is not more than 40cm. Soft rock uniaxial saturated compressive strength should not be less than 15MPa. Otherwise, the CBR test should be carried out, CBR not less than 15%, should avoid the use of expansive mineral composition of shale, soluble rock, rock and rock. At the construction site, should be full-time staff on the loose thickness and the maximum size of the inspection, found that ultra-grain gravel should be timely solution and removal of small.Small Road Roller - Shanghai Doan Machinery Technology Co.,Ltd

For different types of rocks or lithological differences in the larger stone, should be different rock types, different lithological stone layering, sub-filling, the filling layer thickness and compaction control standards are also different. Compaction quality standards should adopt the difference of compaction settlement or porosity as the control index.
The use of bulldozers or loaders paving and leveling, should try to use "into the type" paving method, the first section of the road from the filling material, with bulldozers opened leveling, control the thickness of its loose pavement construction requirements; As the basis for the material poured into the loose layer with a bulldozer on the material gradually move forward, so that the filler can continue to roll fall, aniseed in the next, filled with small and medium material in the aniseed to form a more balanced and stable material layer structure , At the same time to avoid the paving process, the separation of coarse and fine materials, all the fine material to the paved layer of the phenomenon of precipitation. Ensure that the largest stones should be at the bottom of each layer, that the finer particles are at the top and fill the voids during the filling period to ensure optimum crowding and pressure transmission while providing a roller that will not be damaged when the roller is running Of the compacted surface. Artificial laying of stones larger than 33cm in diameter, should be paved with large stone, large face down, small face up, put stability, and then a small stone leveling, stone debris seams, the final compaction. Bulldozers paving is completed, the paving surface of the prominent rock, bumpy parts, should be manually cleared and smooth. When the laying of geosynthetics, the face should be prohibited to vehicular traffic, backward paving leveling. Avoid the construction machinery rolling geotextile.
When the packing gradation is poor, when the gap between stones is large, a small amount of fine material can be filled on each surface to fill the gap between stones. When paving, the heavy construction machinery has coarse compacting and crushing Role, is conducive to further compaction compact compaction machinery.
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Structure of crushed stone
At present, there are two kinds of common gravel spreader: one is with a sub-plate, the spreader of the spreader (Figure 1), gravel within the hopper drum rotating force driven into the sub-materials In the plate 2, the stone is subjected to the resistance of the slanting partition plate of the distributing plate 2 so as to be moved at the same time when it slides, so as to increase the width of the spreading cloth, and then hit the spreading plate 3 to make the stone uniform (As shown in Figure 2), the belt conveyor 1 to the gravel transported to the lower hopper 3, the spiral feeder 2 will be pushed to the next hopper crushed stone (Figure 2), the hopper, 3 of the outer end, to increase the width of the purpose of spreading, the lower part of the hopper 3 under the action of the rotating force of the drum 5, without the sub-material sub-material directly impact to the spreader plate 3, the stone vertical evenly, Thereby completing the spreading process.Small Road Roller - Shanghai Doan Machinery Technology Co.,Ltd
As shown in Figure 3 (a)), the dispenser (Figure 1 (a)) has the advantages of simple structure, easy operation, high reliability and wide applicability. Stone construction of the initial stage, because the middle of the stone in the sub-plate slide on the short trip, while the resistance by the partition plate is large, likely to cause the middle of the stone start falling fast, both sides of stone slow down, Crescent-shaped. The modified sub-plate (shown in Figure 3 (b) below) will be the bottom plate made of circular plate, so that the middle of the vertical partition of the slope becomes smaller, stone resistance increases, the stone in the material Plate sliding time longer; both sides of the partition at the slope of the larger, stone resistance decreases, so that the stone material in the sub-board to reduce the glide time, the final stone from the edge and edge of the edge into a homogeneous edge. 
(Figure 1). After the distribution board through the improved, the total time after the fall through the adjustment of the arc is basically the same, gravel in the distribution board speed decomposition (Figure 4 , It can be seen that there is a component V2, V2 in the transverse velocity V of the falling velocity V of the gravel, which increases with the increase of the inclination angle a of the baffle, and decreases to a certain extent after striking the spreading plate, , The middle part of the process of gravel falling stone V2 minimum, V2 on both sides of the largest, due to the inconsistency V2 likely to cause uneven gravel spreading.
Belt Conveyor Hopper Dispenser (see Fig. 2) can be completed without hoisting hopper due to the belt feeding method. The height of the equipment is not increased during the construction, especially for culverts and overpasses. And the transverse velocity of the stone is not higher than the vertical velocity of the stone during the process of stone falling. Therefore, the spreading accuracy of the spreading device is higher than that of the spreading device shown in Fig. In order to meet the spread of the width of the requirements, such a distributor must be used in pairs, and the spreader structure is more complex, high manufacturing costs. In this case,
At present, the homemade synchronous gravel seal car has occupied a considerable market share, engineering and technical personnel of the synchronous gravel seal car technology research continues to deepen, with the construction unit of the project quality requirements are increasingly high, homemade synchronous broken Stone seal car design and manufacturing level will be further optimization and upgrading.
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1, noise insulation

Solid wood flooring material is hard, meticulous wood fiber structure, low thermal conductivity, heat and sound barrier effects than cement, tiles and steel.

2, adjust the humidity

Wood features solid wood flooring is dry climate, the internal water timber release; climate is humid, the wood will absorb moisture in the air. Wood floors by absorbing and releasing moisture, the room air humidity is adjusted to the body of the most comfortable level. Scientific research shows that long-term residents huts, can extend the life of an average of 10 years.

3, cool

Winter, wood flooring board surface temperature than the tile board high temperature 8 ? ~ 10 ?, people walking on the wooden floor without coldness; summer, wood flooring living room tiled room temperature than low temperature 2 ? ~ 3 ?.

These are the advantages of solid wood flooring, if you choose the floor of the family when you can choose solid wood flooring, it is more environmental health.

the article come from: Analysis of wood plastic floor quality

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According to project quality requirements: 1) To obtain uniform compaction density, the choice of tire roller. Tyred roller during rolling without damaging the soil original viscosity, good binding properties between the layers of soil, combined with the front wheels can swing it more uniform compaction, there will be no false compaction. 2) To make the road smooth compaction, optional full-driven roller. ...Seven Trust Composite Floor Manufacturer - WPC green floor

According to engineering quality options:
To obtain a uniform compaction density, the choice of tire roller. Tyred roller during rolling without damaging the soil original viscosity, good binding properties between the layers of soil, combined with the front wheels can swing it more uniform compaction, there will be no false compaction.
To make the road smooth compaction, optional full-driven roller.
Roller compaction capacity for less demanding areas, use a low pressure line and mobile and flexible roller.
To achieve compaction effect as soon as possible, the choice of large tonnage rollers to shorten the construction period.Best Road Maintenance Machinery - Doan Machinery

According to ply thickness options:
When compacted asphalt concrete pavement should be selected according to the weight of the roller mix paving thickness, amplitude and frequency of vibration. Typically, the ply laminate thickness of less than 60mm thin, it is best to use an amplitude of 0.35 ~ 0.60mm of 2 ~ 6t small vibratory roller, which can avoid stacking, from wave damage and aggregate phenomena;
Meanwhile, in order to prevent cold asphalt mixture, after the paving should be followed by rolling. For thicknesses greater than 100mm thick overlay, you should use high amplitude (up to 1.0mm), 6 ~ 10t medium-sized vibrating rollers.
According to the type of road (level) selection:
For one, two national trunk roads and vehicle-specific way, you should use a large vibrating roller compaction with higher capacity 6 ~ 10t; the time for the following three roads, infrequent or compaction, preferably with 2t so flexible vibrating roller.
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