breake waters with concrete units
Post on 19-Feb-2015
25 Views
Preview:
TRANSCRIPT
Dikkowita BreakwaterDikkowita Breakwater• A new Fishing Harbour is being built 10 kilometer north of Colombo, Sri Lanka
•The harbour is protected by two breakwaters and is designed for 125 ft. fishing vessels.
•Both breakwaters have a concrete crown wall
•The total length of the breakwaters is more than 1 kilometer.
BreakwaterA structure protecting a shore area, harbor, anchorage, or basin from gigantic waves
Elements of a Breakwater & FunctionsFoundation – Provides embankment stability
Core – Provides Bulk of structure and reduces wave transmission
Under layer – Contains the core and provides foundation for armor
Armor layer – Provides wave protection
Crest – Provides access and reduces overtopping
Toe – Support the main armor and prevents foundation erosion
Concrete Armor units for Dikkowita breakwatersXblocs® (trade name) six-legged mass concrete structure used as armor unit
Innovative combination of hexapod and accropod
Applied for offshore breakwaters
Automatically interlocking single layer armor unit
Highly porous armor layer absorbs energy of upcoming waves and dissipate
Highly porous armor layer minimizes wave overtopping and reflection
Economical compared to other concrete armor units
Different types of armor units
Cost of different types of armor units
Why use Xbloc Concrete Armor units?•Economical - achieve good interlocking, placement of the units is straightforward, reducing both construction time and overall costs.
•Reliable - Extensive research both on hydraulic stability and structural integrity has proven •Outstanding structural integrity
•Easier fabrication - have a simple and mostly rectangular shape•Faster placement- designed for ‘automatic interlocking’ and thus can easily find a stable position on the slope•Lower concrete volume - provide large hydraulic stability and require relatively low packing densities
•Easy to use - Easy to produce, Easy to store, Easy to place•Ecological - create an artificial reef, high porosity provides a healthy environment for reef vegetation thus biodiversity will be enhanced
Construction of Dikkowita Breakwater Armor Layer
Casting Xbloc concrete armor units
At Completion
Why Toe Protection ?•Support the armor layer from wash out
•Prevent foundation exposure and submerging of structure
Without toeWith toe
Toe protection used at Dikkowita Breakwater•Has used new concept of toe with Xbase (trade name)
•Similar material to Xbloc and similar properties•Advantages of special toe unit
-High hydraulic resistance -Low centre of gravity -Easy casting
•Advantages compared to conventional rock toe-Higher stability -Lower use of material -Easier and faster to construct -Can be used as crest units
Lab testing for Toe units
Placing of Xbase Toe units
top related