Tremie method – underwater concreting work

Methods of depositing concrete in underwater.

In this article we will discuss one of the depositing concrete method in underwater.

The underwater concreting technique Design mostly to prevent cement washout.

Underwater concreting using Tremie method is convenient for pouring large amount of high flowable concrete.

The tremie concrete placement method uses a vertical or near vertical pipes, through which the concrete is placed by gravity feed below water level.

#  Procedure :-

  1. In this method a tremie pipe is inserted in the water up to the point where concrete is going to place.
  2. Generally the diameter of a tremie pipe varies from 20 cm to 30 cm.
  3. Depending upon the depth of concreting underwater we can add more tremie pipes by coupling it with one another.
  4. 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.
  5. After tremie pipe reaches at the desired depth, of funnel is fitted to the top end of the tremie pipe to facilitate pouring of concrete.
  6. Then concrete having a very high slump of about 150 mm to 200mm is poured into the funnel, until the whole length of tremie pipe is filled up with concrete.
  7. Then the tremie pipe is lifted up and give a slight Jerk by a winch and Pulley arrangement.
  8. Due to all applications 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 the water into the pipe from the bottom. )

  1. When all of the concrete inside the pipe gets discharged, the pipe is given again completely filled with concrete and the process is repeated.
  2. This process of filling and discharging of concrete is repeated without any interruption, until the concrete level come over the water table .
‡‡ Design concepts and tricks provided tips :-
  1. No compaction is required for underwater concreting, as concrete gets contacted by the hydrostatic pressure of water.
  2. Pumping of water should not be allowed while concreting, because it may suck cement particles from the concrete.
Thank you for visiting……

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