Using excavator, loader and dump trucks for removing unsuitable materials which will be dispod at place designated by the Employer.
2) Excavation worksthriller专辑
Excavation will be carried out ction by ction.
The common excavation shall be performed by excavator, loader and dump truck. As for rock excavation, a crawler mounted drilling machine with air compressor will be employed for shallow hole blasting operation to split and loo the rock, the excavated materials will be removed and dispod by dump truck.
The process flow of common excavation is as follows:
Demarcating the excavation line after survey →original ground clearance →mobilizing equipment into position→excavation and disposal
The processing quence of rock excavation by blasting operation:
Surface clearance →drilling machine in position→drilling by drilling machine step by step→charging the hole →blasting→inspection and clearance
Since the rock excavation of the project is 22143m3 in volume, some experienced and competent experts will be assigned for conducting and supervising the entire blasting operation, so as to ensure the safety and efficiency.
1.1.2.3 Subgrade Filling
1) Earth Filling works
Filling in horizontal layers and compaction in layers shall be ud in construction. The thickness of each loo filling layer. Filling material shall be delivered to the site by 16m3
利物浦大学排名dump trucks and leveled firstly by bulldozers and then by grader for preci leveling after it is filled in filling area, and then rolled with vibration and static compaction by using single-drum vibratory road rollers and static rollers respectively. Small compactor shall be ud where roller can no reach.
During construction, thickness for each layer, leveling, water content, and compaction scope and number of compaction shall be controlled strictly. Only when the previous work is approved and accepted by the Engineer after inspection, then filling of next layer can be made. Pile up filling by dump truck or overfilling is not allowed. The spoil is required to be leveled and compacted to prevent environmental contamination.
大比The construction works shall be properly arranged taking due account of rainy ason, so as to avoid working in rainy days.
Flow-chart for filling works of subgrade earthwork:
Inspection and accepted
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2) Rock Filling
Rockfill shall be ud for filling in soft ground areas, as for culverts and wall back filling, rock filling material to be ud shall be lected. Silt and soft materials will be removed before filling.
Construction method of filling and compacting in layers shall be adopted for rock subgrade. Thickness of filling and compaction for each layer shall be controlled within 250mm.
Flow-chart for rock filling of subgrade:
Construction method: Excavators and dump trucks shall be ud for loading and transportation, bulldozers in large hor power shall be ud for leveling and grading, join
t filling by manual labor, and single-drum vibrating rollers and steel rollers shall be ud for compaction.
2.2 Construction Method for Cement stabilized Natural Gravel Subba Cour
1) Construction plan
Mixture ud for cement stabilized natural gravel sub-ba in thickness of 250mm shall be mixed at mixing plant, and paver will be ud for subba laying in one operation. To cover the full width, paving shall be performed by paver in two times. And compaction shall be done using a vibrating roller and a tyred roller, the workmanship of shoulder with subba material is as same as that for cement stabilized natural gravel subba.
