HULHULE-MALE’ BRIDGE PROJECT

EIA for the proposed Hulhule-Male’ Bridge Project
2.4.2 Construction method of approach bridge
2.4.2.1 Superstructure construction technology
Superstructure of the bridge approach will be a type-I precast structure. It will be precast at
Hulhumale and transported to site on a barge. Once at the site, it will be hoisted using purpose
installed cranes and lifting stations.
Bridge deck slabs and diaphragms (partially) are cast on-site. The bridge deck system (including
pitch pavement, sidewalk, guardrail and so on) will also be cast on-site but after one year from
the bridge approach construction.
2.4.2.2 Substructure construction technology
No. 1 to 6 piers, No. 25 and 26 pier construction
No. 1 to 6 piers, 25 and 26 piers are pile foundations. They will be installed by setting up drilling
platforms right above the designated locations. Activities involved in the construction of piers
includes setting up trestles along the shore to every pier and setting up drilling platforms; driving
the steel sheet piles; excavating the foundation trench; driving pile foundation steel casing;
drilling and pouring concrete; pouring sub-sealing concrete on the bearing platform and
constructing the bearing platform; finishing the pier bodies and bent cap construction.
No. 7 and 17 underwater pier construction
No.7- 17 pier belongs to an underwater pier, with more than 3 m of water depth, which is
planned to be constructed using a self-elevating mobile platform.
Construction process of the self-elevating mobile platform:
1) Position the working platform and lift it above the water surface.
2) Install the guiding orientation rack, and pass down the steel casing utilizing crawler crane
of 200 t on the platform. The drilling machine will drill into rock and pour concrete into
the casings as described before.
3) Repeat the step two to complete the lowering of rest steel casings.
4) Remove the construction platform and move the platform to the next pier.
Prepared by: CDE Consulting & China Shipping Environment Technology Page| 31