Engineering and Design. Design of Sheet Pile Cellular Structures cofferdams and Retaining Structures
are also used for retaining walls; fixed crest dams and weirs; lock,
guide, guard, and approach walls; and substructures for concrete gravity
superstructures. Each of these structures can be built in the wet, thus eliminating
the need for dewatering. When used as substructures, the cells can be
relied upon to support moderate loads from concrete superstructures. Varying
designs have been used to support the concrete loads, either on the fill or on
the piling. When danger of rupture from large impact exists, the cells should
be filled with tremie concrete. In the case of concrete guard walls for
navigation locks, bearing piles have been driven within the cells to provide
added lateral support for the load with the cell fill. Precautions must be
taken to prevent loss of the fill which could result in instability of the pile-supported structure. Bearing piles driven within the cells should never
be used to support structures subjected to lateral loads.
To ensure compliance with all design requirements and conformity
with safe construction practices, the cellular cofferdam construction should
be subjected to intensive inspection by both construction and design personnel.
Periodic and timely visits by design personnel to the construction site
are required to ensure that: site conditions throughout the construction
period are in conformance with design assumptions, contract plans, and specifications;
project personnel are given assistance in adapting the plans and
specifications to actual site conditions as they are revealed during construction;
and any engineering problems not fully assessed in the original
design are observed and evaluated, and appropriate action is taken. Coordination
between construction and design should be sufficient to enable design
personnel to respond in a timely manner when changed field conditions require
modifications of design.
with safe construction practices, the cellular cofferdam construction should
be subjected to intensive inspection by both construction and design personnel.
Periodic and timely visits by design personnel to the construction site
are required to ensure that: site conditions throughout the construction
period are in conformance with design assumptions, contract plans, and specifications;
project personnel are given assistance in adapting the plans and
specifications to actual site conditions as they are revealed during construction;
and any engineering problems not fully assessed in the original
design are observed and evaluated, and appropriate action is taken. Coordination
between construction and design should be sufficient to enable design
personnel to respond in a timely manner when changed field conditions require
modifications of design.
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