Highway Construction Method Pdf Free


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Lift height before compaction depends on the compaction equipment being used. I t help in the social and culturaldevelopment. Fills which are part of the roadway should not be constructed by end dumping. - proper compaction equipment is available such as a "grid roller" or vibrating or tamping roller . 6.2.1 Bulldozer in Road Construction . The method and equipment used in road construction is an important economic and design factor in road location and subsequent design. Raveling disturbance and erosion is reduced as well because of lesser excavation and little or no downhill drifting of embankment material (Figure 109). Job condition correction factors for estimating bulldozer earth moving production rates. Felled trees and stumps are left to act as temporary retaining walls until removed during final excavation. Plan construction activities for the dry season. In the latter case, it has been incorporated into the fill, properly compacted, and presumably unavailable for erosion. The bucket of the excavator is much more effective at ripping than the dozer blade. The hydraulic excavator is a relatively new technology in forest road construction. There are clear indications that approximately 80 percent of the total accumulated erosion over the life of the road occurs within the first year after construction. The formation or construction of the subgrade begins after the clearing and grubbing (stump removal) phase. Organic material should be deposited at the lower edge of the road (Figure 105, E to F). The backhoe or excavator should be the preferred machine on steep side slopes.


(Caterpillar Handbook, 1984) . Figure 109. The trail will serve as a bench and provide a catch for the fill to hold on (Figure 106). Trees should be felled and cleared a minimum of 1 to 3 m from the top of the cut or toe of the fill (Figure 105). I t contribute to the industrialdevelopment. Since the material is placed, as opposed to pushed and/or sidecast, excellent control is achieved in the placement of the excavated soil. By comparison, a loaded dump truck (3 axles, 10 m3 box capacity) generates a ground pressure of 5 to 6 bar (72.5 to 87.1 lb / in2). Additional Resources. This machine basically operates by digging, swinging and depositing material. The machine starts at the top and in successive passes excavates down to the required grade. Erosion from newly built fill slopes can effectively be trapped through filter strips or windrows made of slash and placed at the toe of the fills. Suitable material from the clearing and pioneering activity should be stockpiled at designated areas either above or below the clearing limits. Slope Class* Filter Windrow (no windrow) Unprotected m3 / 1000 m 1 0.30 33.29 2 0.65 64.30 . 220 p. Figure 102. Earth is moved down-grade with the aid of gravity, not up-grade. Adjustment factors for bulldozer production rates in relation to grade. Figure 120. e44e635bdc

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