cairo metro project e14155 - presentation to jv 23 dec 2014
TRANSCRIPT
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Contents
• First Depot design and construction item• Number of Design Stages• Design Delivery Schedule• Design Phase 4A/4b Boundary Limits for Groups G1 to G6
• Comparative Structural designs
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First Depot design and construction• After site clearance, the first design and construction item for the depot, will be an equipment low point and inspection trench drainage design.
• This will be from the lowest points in the depot, the bogie drop and the wheel grinding lathe, plus all of the inspection trenches in the various buildings.
• There will possibly need to be a low point sump and pump for this drainage to sewer.
• There will be separate shallower stormwater (if required) or sanitary drainage systems.
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Stage 1 – typical stations and viaduct
Stage 2 – Adly Mansour station
Stage 3 ‐ Depot
DAR proposal – December 2014
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Draft JV and JV designer DAR detailed design review comments process from IPP issue by DAT to IFA issue by DAR for approval by NAT
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Group 2 – Civil and Structural Engineering with station and viaduct architectural (arrangement), electrical, plumbing and fire fightingGroup 3 – Power Supply, Electromechanical and Mechanical with depot (workshop) architectural (arrangement), electrical, plumbing and fire fightingGroup 6 ‐ Toll (ticketing) Equipment Red text design and installation items by Phase 4a in a Phase 4b station
El Nozha 2 Station
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Geotechnical comments on pile foundationsDisadvantages of using Mono‐piles (2.4m diameter) in lieu of a group of 1.2m diameter piles to support the columns of viaduct and stations:
• Reduction of allowable concrete pile structural carrying capacity
• Reduction of allowable concrete pile geotechnical carrying capacity by about 25%
• Tolerance of deviation of pile centerline should not exceed 0.1 of the equivalent pile diameter and its effect if any should be considered in pile/ pile cap design.
• Pile load tests frequency should be 1 test for each 50 piles.
• More costly load testing configuration for both preliminary and working piles
• Nondestructive tests should be performed on all Mono‐piles.
• Strict precautions should be taken during construction.
• Limited previous local experience with construction of 2.4m diameter piles
• Costly remedial solutions in case of non acceptance of mono‐pile after its construction