| 摘要 |
<p>A pumping apparatus (17) sends a fluid mixture of concrete to a tremie pipe (19) mounted on a mobile pontoon (18). The bottom output end (22) of the tremie pipe is submerged in the water and faces the bed (12). The pontoon and the tremie pipe are moved along a predetermined path on the water surface of the depositing site so as to deposit on the bed (12) a layer of concrete (16) which lines continuously the entire bed of the depositing site.</p> |
