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Tiecell Caisson

01 Performance Principles

• Separate blocks are moved up and down, left and right underwater to be interlocked as a unified structure.
• A caisson breakwater ensures outstanding safety, but as a heavy structure, demands high costs of production, lifting and installing.
• This method is a source technique that can be applied to every marine structure from small fishing ports to large container berths.

/ Method to Interlock Blocks on Underwater

02 Performance Improvement

• Tiecell blocks are moved and interlocked underwater, ensuring high stability against waves. They can be interlocked in various shapes unlike existing breakwaters.
• There may occur slight errors when tiecell blocks are manufactured or installed underwater. The solutions to such errors are as follows:
--- Rebar net columns are made to be 30% smaller than the lattice holes.
--- A penetrating interlocking body is designed to be 30% lager in diameter than that in the structure review so as to ensure structural stability regardless of construction errors.
--- As shown in the figure, the rebar net columns, designed to be 30% smaller than the lattice holes, can be embedded even though there are errors in production or construction. A protection against seawater is attached against the side by side pressure, interlocking firmly the blocks.

/ Flow Chart of Tiecell Blocks Installation

03 Economic Efficiency

• Compared to tetrapods (TTPs), less space and fewer blocks are required, which makes it economical.
• Small blocks are fabricated on land and interlocked underwater, so ensuring economic efficiency and the stability of the caisson method.

/ Minimized Cross Section & Quantity, Allowing Economic Efficiency
/ Small Blocks Fabricated and Interlocked Underwater (Caisson Method Applied)
/ Efficiency of Tiecell Blocks

04 Structure Stability

05 Paradigm Shift

/ Change in Harbor Structure Construction Methods
More Than 30% Reduced
Comparison of Costs by Construction Methods

06 Applications

• The blocks allow a wide range of applications from small fishing ports to large container berths.
• They can be interlocked underwater with small equipment and remain stable against high waves and hurricanes, etc.
• It is the method that is able to reinforce a coastal structure most cost-effectively.

/ Schematic Diagram of Interlocking Column

/ Applications of Tiecell Block Method

07 Design

• Interlocking columns can solve stability problems.
• Blocks can be interlocked in various shapes.
• Tetrapods (TTPs) are still placed in large numbers of ports, but distinguished waterfront attractions can be created with the blocks.

/ Realization of Round Breakwater

08 Process of Tiecell Block Construction

• Light-weight tiecell blocks are fabricated on land.
• The tiecell blocks are installed underwater.
• Riprap is filled in the riprap area of the blocks to secure weight.
• Rebar net columns covered with waterproof membranes are embedded in column holes in the blocks.
• Concrete is poured in the column holes.
• Reinforcing bars are placed in upper areas of the rebar net columns, and cap concrete is laid.


Assembly the steel formwork

Fabricate tiecell blocks

Install the first layer underwater

Install the second block layer

Fabricate reinforcing bars of interlocking columns

Insert the reinforcing bars

Concrete the interlocking columns

Assembly the cap concrete formwork

Pour cap concrete

A view after the cap concreting is finished

Construction is completed