Hinged floating caissons and unfolding devices therefor

A hinged floating box caisson structure comprising:

• a central caisson;
• a pair of lateral caissons hingedly connected to opposite ends of said central caisson by means of respective first pivots such that said lateral caissons are foldable about said first pivots with respect to said central caisson between an operative position, whereat said lateral caissons extend laterally of said opposite ends of said central caisson, and a transport position, whereat said lateral caissons are folded on top of said central caisson;
• a pair of end ballasts hingedly connected to opposite free ends of said lateral caissons by means of respective second pivots such that said end ballasts are foldable about said second pivots with respect to respective said lateral caissons between an operative position, whereat said end ballasts extend substantially laterally of said respective lateral caissons when said lateral caissons are in said operative position thereof, and a transport position, whereat said end ballasts are folded on top of said respective lateral caissons when said lateral caissons are in said transport position thereof;
• and
• each said end of said central caisson and the respective said lateral caisson and said end ballast having associated therewith means for moving said lateral cassion from said transport position thereof to said operative position thereof and for simultaneously moving said end ballast from said transport position thereof to said operative position thereof, said moving means comprising a rocker and link assembly pivotally connected to said central caisson and said respective lateral caisson, cylinder means connected to said central caisson and said rocker and link assembly for moving said rocker and link assembly and causing said lateral caisson to rotate about said first pivot through an angle of 180.degree. from said transport position thereof to said operative position thereof, a constant length rope connected at a first end thereof to a first fixed point on said end ballast and at a second end thereof to a second fixed point on said central caisson, whereby when said cylinder means is operated to rotate said lateral caisson about said first pivot, said rope extending between said first and second fixed points is tensioned to cause said end ballast to rotate about said second pivot from said transport position thereof to said operative position thereof, and means for taking up slack in said rope when said lateral caisson and said end ballast are in said transport positions thereof, said slack taking up means comprising an arm pivoted at a first end thereof about a third pivot to said end ballast, said rope passing around a second end of said arm, and spring means biasing said arm about said third pivot.