3-Cofferdam Designs PDF

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Summary

Tutorial Drawing sheet for Cofferdam...

Description

COFFER DAMS

1.5

:1

SL OP E

1M

E OP SL

MIN. 1 M.

2:

1

1.30 M

1.30 M

1M

MIN. 1 M.

3

EARTH FILLING DRAIN

(A) EARTHEN COFFERDAM

DRAIN

ROCK FILL COFFERDAM

DEFINITION : A COFFERDAM IS A TEMPORARY STRUCTURE WHICH IS BUILD UP TO REMOVE WATER FROM AN ARE AND MAKE IT POSSIBLE TO CARRY ON THE CONSTRUCTION WORK UNDER REASONABLY DRY CONDITION COFFERDAMS ARE CONSTRUCTED FOR FOUNDATION OF PIER BRIDGES, ABUTMENTS ETC., EARTHEN COFFERDAM : THIS IS THE SIMPLEST FORM OF COFFERDAM ITS USE IS LIMITED IN THE VICINITY WHERE THE IMPERVIOUS EARTH IS AVAILABLE AND WATER DEPTH IS SHALLOW WITH LOW VICINITY OF FLOW ITS SHOULD BE NEWER USED WHERE THERE IS DANGER OF OVER TOPPING BY WATER. ROCKFILL COFFERDAM : THEY ARE CONSTRUCTED BY PLACING ROCK ALONG STREAM. THEY CAN BE USED FOR DEPTHS OF WATER UP TO ABOUT 30 AND ARE SUITABLE EVEN IN CASE OF SWIFT WATER THEY ARE ECONOMICAL IN PLACES WHERE ROCK IS AVAILABLE IN PLENTY AN IMPERVIOUS LAYER OD EARTH IS LAID ON THE OTHER FACE OF THE COFFERDAM WHICH MAKES IN IMPERVIOUS. THEY CAN WITHSTAND THE OVERTOPPING OF WATER WITHOUT ANY SERIOUS DAMAGE. SINGLE WALLED COFFERDAM : THIS TYPE OF COFFERDAM IS SUITABLE WHEN AVAILABLE WORKING SPACE IS LIMITED AND AREA TO BE ENCLOSED ID SMALL. IT MAY BE USED UP TO THE MAXIMUM DEPTH OF WATER OF 25M THE WALLS OF A COFFERDAM ARE NORMALLY MADE UP TO STEEL PILE COMMERCIALLY AVAILABLE OF A MAXIMUM LENGTH OF 22M. THE ARE BRACED WHEN USED FOR BRIDGES ACROSS PERENNIAL RIVERS THE CRAVE OPERATED GRABS ARE UTILIZED TO CARRY OUT THE EXCAVATION INSIDE THE ENCLOSED SPACE GREAT CARE IS TAKEN TO SEE. THE GRAB DOES NOT COLLIDE WITH ANT STRUT DURING ITS TRAVEL TO AND FROM THE INSIDE OF THE TRENCH. DOUBLE WALLED COFFERDAM : DOUBLE WALLED COFFERDAMS ARE PROVIDED TO ENCLOSED A LARGE AREA THE DOUBLE WALL GIVES STABILITY TO THE COFFERDAM. THIS TYPE IS USEFUL WHERE SCOUR PROBLEMS AND SPACE LIMITATION ARE PREVALENT.

NAME CLASS ROLL NO

SIMPLE WALL COFFERDAM

DOUBLE WALL COFFERDAM

YEAR

: F.S OF BE-II(PTD)...