The bored piles in the bridge position letter Y have quite thick layer of cobbles geology on 10 m, the use of the drill used to drill bucket pile at P21-P15 to construction are very difficult to drill through very thick layer of cobbles. So the contractor Bre17 proposed in case of drilling the remaining piles that use dandruff D1000 drilling contractor, please first drill chicken intestines used to replace drilling D1000 dandruff, and use the key for rock drill bucket has been falling hard to pierce the bait, then replaced by the bucket to rock bottom D1000 drilling boreholes. Recommended glass main contractor approved by the projects LEO contractor Bre17 suggestions and comments directed to ensure the quality and progress of construction.
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