In such cases, the use of a bottom-dump bucket or tremie pipe is made use of. In the bottom-dump bucket, the concrete is taken through the water in a water-tight box or bucket and on reaching the final place of deposition the bottom bucket mechanism gets open automatically and the whole concrete is dumped slowly. Tremie Pipe Concreting This method will not give a satisfactory result as a certain amount of washing away of cement is bound to occur. In some situations, dry or semi-dry mixture of cement, fine and coarse aggregate are filled in cement bags and such bagged concrete is deposited on the bed below the water. This method also does not give satisfactory concrete, as the concrete mass will be full of voids interspersed with the putrescible gunny bags. Tremie pipe method of concrete placing underwater is a satisfactory method and widely used all around the world.
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Tremie Method of Under Water Concreting Tremie method is the most acceptable method of concreting under water. In this method a tremie pipe is inserted in the water up to the point where concrete is going to be placed. Generally the diameter of a tremie pipe varies from 20 cm to 30 cm. Depending upon the depth of concreting under water we can add more tremie pipe by coupling it with one another.
Before inserting the tremie pipe into the water, the bottom end of the tremie pipe must be closed with a plug or thick polythene sheet or other suitable material. After tremie pipe reaches at the desired depth, a funnel is fitted to the top end of the tremie pipe, to facilitate pouring of concrete.
Then concrete having a very high slump of about mm to mm is poured into the funnel, until the whole length of tremie pipe is filled up with concrete. Due to application of jerk and weight of the concrete inside the pipe, the bottom plug fall and the concrete gets discharged. At this stage, make sure that the end of the tremie pipe remains inside the concrete, because this will prevent entering of water into the pipe from the bottom. When all of the concrete inside the pipe gets discharged, the tremie pipe is again completely filled with concrete and the process is repeated.
This process of filling and discharging of concreting is repeated, without any interruption, until the concrete level comes above the water table. Notes Pumping of water should not be allowed while concreting, because it may suck cement particles from the concrete.
No compaction is required for under water concreting, as concrete gets compacted by the hydrostatic pressure of water. Share this:.
Tremie Pipe – A Underwater Concreting Method
Written by: Posted on: November 7, Tremie Method Of Underwater Concreting Category: Concrete Have you ever wondered how the bridges spanning a river of thousands of meters width, stand in the flowing water? How the labor and workers can construct these piers and caissons? How civil engineers can construct piles of several kilometers into the ground by avoiding the underground water and letting concrete stand in it with full required strength? You will be able to answer all of these questions after reading this article. Civil Engineers can play with forces of nature, they can create holes into the rocks of kilometers length, they can divert the direction of river flow and many other examples have proved this fact.
Tremie Method Of Underwater Concreting