The method for raising the efficiency of heavy tamping compaction construction of gravity wharf rubble bed under the prerequisite of guaranteeing quality is approached.

探讨重力式码头抛石基床重锤夯实施工中在保证质量的前提下提高作业效率的方法。

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Based on the actual example in the project, we discuss the diagnosis methods and reinforcement measures when rubble bed of gravity wharf is damaged by water flow from tugboat's starting.

结合工程实例，论述了重力式码头抛石基床遭拖轮启动工作时尾吹水流冲刷破损后的检测诊断方法和加固治理措施。

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Bed gravity is an irresistible force that draws you back to bed, or toward any mattress, couch, or other soft horizontal surface.

“床重力”是一股让你难以抵抗的力量，能将你拉回床、床垫、沙发或者其他一切软的可以平躺的物件上。

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More than 1, 500 historic buildings dot the downtown area, and because the city was built atop a drained lake bed, some edifices , like the gravity-defying Ex-Teresa museum, a former 17th-century convent, are teetering like there is no tomorrow.

BBC: Mexico City: More than a stopover

Once I was in bed again, a kind of black-hole gravity held me there.

NEWYORKER: The Reptile Garden