Changhong Tunnel
HEIGHT: 8.45m
WIDTH: 22.80m
TOTAL IMMERSED LENGTH: 395m
DEPTH AT BOTTOM OF STRUCTURE: -8.4m(top) -16.85m(bottom)
ENVIRONMENTAL CONDITIONS:
Yong river dike and dock; The historical highest tide level 3.31 m; Average high tide
level 1.28 m; The historical lowest tide level –1.72 m; Average low tide level –0.48 m;
FABRICATION METHOD:
Casting basin, one time 4 elements, on the south cut
& cover tunnel site
WIDTH: 22.80m
TOTAL IMMERSED LENGTH: 395m
DEPTH AT BOTTOM OF STRUCTURE: -8.4m(top) -16.85m(bottom)
ENVIRONMENTAL CONDITIONS:
Yong river dike and dock; The historical highest tide level 3.31 m; Average high tide
level 1.28 m; The historical lowest tide level –1.72 m; Average low tide level –0.48 m;
FABRICATION METHOD:
Casting basin, one time 4 elements, on the south cut
& cover tunnel site
Ningbo city, Zhejiang province,
China
Ningbo Changhong Tunnel Development CO., LTD.
Shanghai Tunnel Engineering CO., LTD.; Shanghai Salvage Bureau; CCCC Third Harbor Engineering CO., LTD.
Shanghai Tunnel Engineering & Rail Transit Design and Research Institute
E1: 95m, E2-E4: 100m
395m
-8.4m(top) -16.85m(bottom)
Project construction
2002-04-30
4
For each tube 2 lanes; service/emergency escape in the center tube
8.45m
22.80m
Pile foundation to avoid differential settlement in silt and clay. After dredging the siltation
is severe.
A deeper pool inside the casting basin was used for outfitting, which reduced the depth
of most part of the basin.
On-shore dry closure joint.
is severe.
A deeper pool inside the casting basin was used for outfitting, which reduced the depth
of most part of the basin.
On-shore dry closure joint.
Casting basin, one time 4 elements, on the south cut
& cover tunnel site
& cover tunnel site
In the casting basin
Yong river dike and dock; The historical highest tide level 3.31 m; Average high tide
level 1.28 m; The historical lowest tide level –1.72 m; Average low tide level –0.48 m;
level 1.28 m; The historical lowest tide level –1.72 m; Average low tide level –0.48 m;
Two Pontoons were mounted transversely on top of the element for lowering the
element onto its final place. Element was temporarily supported on one nose bracket at
connecting end and on two vertical jacks at the free end. Survey & control tower were
used.
element onto its final place. Element was temporarily supported on one nose bracket at
connecting end and on two vertical jacks at the free end. Survey & control tower were
used.
Gina & omega gaskets. Post
tensioning cables across each
joint.
tensioning cables across each
joint.
No waterproofing membrane was used. Waterproofing concrete was designed to
prevent cracking, cooling of concrete adopted to control early age stresses and ensure
water-tightness.
prevent cracking, cooling of concrete adopted to control early age stresses and ensure
water-tightness.
Pre-stressed concrete pile foundation was used. A 3m long steel pile was coupled on
top of the concrete pile, pile cap was then connected with bottom slab by grouting bag.
top of the concrete pile, pile cap was then connected with bottom slab by grouting bag.
Rock, gravel sand
35MPa with fly ash, cooled, no prestress
temporary condition/permanent condition 1.04/1.2