LNG Terminal Tunnel
HEIGHT: 4.88 m
WIDTH: 8.23 m
TOTAL IMMERSED LENGTH: 1,610 m
ENVIRONMENTAL CONDITIONS:
Stringent environmental protective measures were maintained throughout all phases of
the construction.
FABRICATION METHOD:
The subaqueous tunnel consists of 20 elements, each
having an outer steel plate shell reinforced internally with
transverse ribs and two longitudinal trusses. The open
ends of each section were temporarily sealed by end
bulkheads during the early stages of construction.
After fabrication the steel shells were launched sideways
and towed to an outfitting pier where the internal structural
concrete was installed.
WIDTH: 8.23 m
TOTAL IMMERSED LENGTH: 1,610 m
ENVIRONMENTAL CONDITIONS:
Stringent environmental protective measures were maintained throughout all phases of
the construction.
FABRICATION METHOD:
The subaqueous tunnel consists of 20 elements, each
having an outer steel plate shell reinforced internally with
transverse ribs and two longitudinal trusses. The open
ends of each section were temporarily sealed by end
bulkheads during the early stages of construction.
After fabrication the steel shells were launched sideways
and towed to an outfitting pier where the internal structural
concrete was installed.
Cove Point, Maryland,
United States
Colombia LNG Corporation
Raymond International (leading partner)
Raymond International (leading partner)
80.16m
1610m
Project construction
1976-05-01
20
Three tubes; each outer tube contains a 0.81 m dia cryogenic LNG unloading line and a 0.36 mdia cryogenic vapor return line. Center tube carries miscellaneous piping.
4.88m
8.23m
Tunnel to end of LNG off-loading pier. Used to make facility visually acceptable by
eliminatin 9 Ion 9 pipeline structure out to pier
eliminatin 9 Ion 9 pipeline structure out to pier
The subaqueous tunnel consists of 20 elements, each
having an outer steel plate shell reinforced internally with
transverse ribs and two longitudinal trusses. The open
ends of each section were temporarily sealed by end
bulkheads during the early stages of construction.
After fabrication the steel shells were launched sideways
and towed to an outfitting pier where the internal structural
concrete was installed.
having an outer steel plate shell reinforced internally with
transverse ribs and two longitudinal trusses. The open
ends of each section were temporarily sealed by end
bulkheads during the early stages of construction.
After fabrication the steel shells were launched sideways
and towed to an outfitting pier where the internal structural
concrete was installed.
Stringent environmental protective measures were maintained throughout all phases of
the construction.
the construction.
A specially-built catamaran type lay-barge was used to place each tunnel element. The
elements were first ballasted by placing concrete on the top surface, then lowered onto
a prepared gravel bed in the dredged trench on the bay bottom.
elements were first ballasted by placing concrete on the top surface, then lowered onto
a prepared gravel bed in the dredged trench on the bay bottom.
After each of the 20 sections had been placed in position,
the joints were sealed externally with tremie concrete and
internally with steel liner plates.
the joints were sealed externally with tremie concrete and
internally with steel liner plates.
Continuous outer steel shell.
A
A
The trench was backfilled and tubes completely covered.