man made river project iv phase - ghadames project - ajrt regulating tank 70.000m3

AJRT Regulating Tank 2x35.000m3 Areal View

Man Made River Project IV Phase - Ghadames Project

Al Jewaibyah Regulating Tank 2x35.000m3 Construction

Reservoir schematic overview

Sub-grade Verification Test

Standard Penetration Test (SPT)

Regulating Tank Structural Fill

Structural Fill applied in layers over the sub-grade , level of achieved compaction determined over Field Density Test (FDT)

Plate Load Test

Conducted over the final layer of structural fill.

Regulating Tank - Structural Fill

Final layer of structural fill, compacted, leveled and ready for blinding concrete

Regulating Tank Blinding Concrete

Blinding Concrete (Class C) Design: W=185kg/m3; Cement=300kg/m3; Agg=1.880kg/m3; Add=2.4kg/m3.

AJRT Tank Bottom Slab

Formwork drawing - bottom slab plan

Base Slab - Corrosion Protection

2mm thick PE Sheeting between Blinding Concrete and Base Slab concrete as corrosion protection

Bottom Slab - Sections

Compressible Material

Extruded Polystyrene Type I (ASTM C578) laid on the top of Blinding Concrete (Class C)

Base Slab Reinforcement

Steel Reinforcing Works (ASTM A615):

-Ø>14mm GRADE 60, Yield Strength = 400MPa, deformed; -Ø=12mm GRADE 40, Yield Strength =280MPa, deformed; -Ø<12mm MILD Steel, Yield Strength =250MPa, round

Base Slab Formwork

RMD Kvikform Base Slab shutter with visible black corrosion protection (PE sheet) for later overlapping to vertical surface of the Reservoir wall.

Base Slab Formwork

RMD Kvikform, wall kicker 10cm height

Batching Plant

New Batching Plant erected for supply of Regulating Tank concrete works

Batching Plant

Batching Plant & Cement Silos

Batching Plant with Chiller, Silos,

Aggregate Separator

Batching Plant Chiller

For regulation of concrete temperature in Saharan Desert climate. During the production, concrete temperature on delivery to the Site did not exceed 32°C although ambient temperature often reached 52°C.

Batching Plant Controls

Batching Plant

Automatic mixing & control

Batching Plant Aggregate Separators

Sand blowing for decrease of fine materials

Concrete Quality Control

Cylinder moulds for sampling of concrete

Fresh Concrete Quality Control - Workability

Slump Test

Fresh Concrete Quality Control –

Air Content

Regulating Tank – Outlet Section Base

Slab Concrete

81nr of Base Slab modules (max width 15x15m). The sequential bay method of construction has been used with each consecutive bay having at least two adjacent free edges and not more than two adjacent edges continuous with previous bays

Concrete Works

Trowell of the Base Slab concrete surface, over applied curing compound BASF Masterkure 106D; SIKA

Base Slab Structural Concrete

Concrete Class A: (W=189kg/m3; C=386kg/m3; W/C=0.49 ; Agg=1.830kg/m3; Add=3,1kg/m3) Cement – Type II, ASTM C150; Additive BASF Lubricon L-200, BASF Melcret TB101 Type G

Construction Joints – Water Stop

SCP Ltd - 25x8mm Dual Seal Swellable Water Stop

Swellable Water Stop


Walls – Work Plan

Regulating Tank Walls Formwork

RMD Kwikform Shuttering System


In total 55nr of Wall-segments installed with concrete, max modular wall-length = 15m’, height = 6.06m; width = 0.45m

Regulating Tank Walls Concrete Installation

Construction Joint Base Slab / Walls /

Walls

SCP Ltd - 25x8mm Dual Seal Swellable Water Stop between each of 55nr modular wall-segments

Construction Joint Base Slab / Walls


Walls, Columns & Roof Slab - Sections

Columns Formwork

RMD Kwikform, Columns Ø400mm

Columns Formwork

RMD Kwikform Column-kickers

Regulating Tank Columns (500nr)

500nr Columns Ø400mm Concrete Class A (W=189kg/m3; C=386kg/m3; W/C=0.49 ; Agg=1830kg/m3; Add=3.1kg/m3)

Regulating Tank – Roof Slab Formwork

RMD Kwikform Scafffolding

Roof Slab - Sections

Regulating Tank – Roof Slab Formwork

Regulating Tank Partition Overflow

Wall

Partition Overflow Wall dividing Regulating Tank onto 2 separate Water Chambers (2x35.000m3)

Roof Slab Reinforcement Works

Access Manhole openings– DN600

Roof Slab Reinforcement Works

81nr of Roof Slab modules (max width 15x15m), with 25x8mm Dual Seal Swellable Water Stop in construction joint between each slab

Roof Slab Concrete Installation

Roof Slab d=300mm; Concrete Class A (W=189kg/m3; C=386kg/m3; W/C=0.49 ; Agg=1830kg/m3; Add=3.1kg/m3) Cement – Type II, ASTM C150; Additive BASF Lubricon L-200, BASF MELCRET TB101 Type G

Regulating Tank View during construction

Roof Slab

Survey verification of Roof Slab plywood formwork (behind visible tower-crane and concrete pouring of columns)

Regulating Tank Roof Slab

Reservoir height bottom to roof slab -6,06m, 500nr columns, 81nr base slab, 81nr roof slab modules (max width 15x15m), with 25x8mm Dual Seal Swellable Water Stop in construction joint between each slab


The sequential bay method of construction has been used with each consecutive bay having at least two adjacent free edges and not more than two adjacent edges continuous with previous bays

Regulating Tank Access Manhole

Sealing of Tie-rod holes, finishing works remaining

Outlet Shafts & Overflow

Regulating Tank Overflow Pipe

Penetration

Overflow Steel DN1600mm Pipe Nozzle (25x8mm Dual Seal Swellable Water Stop & elastic sealing 2x1.5cm)

Regulating Tank – Overflow Pipe Wall

Closure of Wall Shutter

Regulating Tank Overflow Pipe

Shutter gaps sealing, centering of the Steel DN1600 Pipe elevation

Regulating Tank Outlet Shaft 1

Outlet Shaft with Steel DN1400mm Pipe


Reinforcement Works on Outlet Shaft 2 with Steel DN1400mm Pipe

Outlet Shaft 1

Formworks

Outlet Shaft 1

Concrete Installation

Outlet Shaft 1

Inlet & Drain Shaft

Inlet Section – Integrated Surge Shaft

Regulating Tank Partition Wall visible at the back

Regulating Tank Inlet & Surge Shaft

Inlet Pipes Steel DN1200mm

Inlet & Tank Integrated Surge Shaft

Steel DN1200 Pipes

Inlet Surge Shaft with Inlet DN1200 pressure

pipes

Wall’s reinforcement works, pipe nozzles positioning and anchoring in progress

Surge Shaft Wall Formworks

Surge Shaft

Surge Shaft Corrosion Protection

All buried concrete surfaces in contact with soil are protected by Coal Tar Epoxy coating, average dry film thickness 150 microns to give overall dry film thickness of 450microns. Underside of bottom slab protected by 2 PE sheets with friction coefficient <0.1

Inlet Surge Shaft – Tank’s Base Slab gap

To be filled with Soil cement.

Surge Shaft – Compressible Material

Corrosion Protection: AmerCoat 78 HBB Resin Black + Cure (1:4); DoeCote 1080H + DoeClean 1080 (1:4)

Surge Shaft – Compressible Material

Corrosion Protection: -Compressible material – Polystyrene 5cm -- 3nr layers of Coal tar Epoxy (min 450 microns)

Inlet Surge Shaft Soil Cement filling

Soil Cement Mix Design: W=300kg/m3; Cement = 140kg/m3 (5% of Soil mass); W/C=2.1; Agg=1760kg/m3; Add=0.44kg/m3

Tank’s Integrated Surge Shaft – Soil

Cement filling

Slump = 5 - 15cm; Minimal 7-days strength = 0.7MPa

Integrated Surge Shaft, Partition Wall between

Water Chambers

Regulating Tank Inlet side overview

Regulating Tank Overview during

construction

Regulating Tank Drain Shaft – Reservoir

Sump

Base Slab reinforcement works, Drain Steel Pipe DN250mm, Sump (750x750x300mm)

Drain Steel Pipe DN250mm Wall

Penetration

Pipe nozzle wall penetration, swellable water stop, elastic sealant for prevention of water leakage.

Regulating Tank Drain Shaft – Tank’s Sump

Internal Expansion Joint with Water Stop between Reservoir Sump and Drain Shaft

Regulating Tank Drain Shaft – Tank’s Sump

Internal Expansion Water-Stop (400mm) left for connection with Drain Shaft

Regulating Tank view during

construction works

Regulating Tank view during construction

Supporting Tower Crane, Batching Plant Silos visible on the right side

Inlet Overflow Weir Wall

Height of Weir (Overflow Wall) top 50cm lower than Roof Slab bottom

Regulating Tank Corner Walls

The sequential bay method of construction has been used with each consecutive bay having at least two adjacent free edges and not more than two adjacent edges continuous with previous bays

Regulating Tank View

Regulating Tank Outlet Section View

Details


Maintenance Opening 3x3m

Regulating Tank Roof Slab Maintenance

Opening 3x3m

View from inside of the tank

Regulating Tank Roof Slab Works

Inlet Overflow Weir Wall visible on left side


Assembling of Steel Pipes DN1400


Welding of DN1400 Steel Pipes in protected environment. Reservoir Overflow DN1600 Steel Pipe visible on upper left side

Regulating Tank Outlet Section

Outlet DN1400 Steel Pipes aligned and welded. Reservoir Overflow DN1600 Steel Pipe visible on upper left side

Regulating Tank Outlet Piping DN1400

View towards downstream Pump Station

Regulating Tank Outlet Pipe – towards Pump

Station

Regulating Tank Outlet View

Steel DN1400 Pipes, Outlet Shafts Walls Reinforcement works visible

Regulating Tank Inlet Section Shafts

Transition from DN1600 PCCP (Pre-stressed Concrete Cylinder Pipes) to DN1200 Steel Pipes

Regulating Tank View

Regulating Tank Outlet with Overflow

Discharge

Overflow Discharge

Regulating Tank – on First Water

First Water on 4th November 2009

Regulating Tank on First Water

First Water on 4th November 2009

man made river project iv phase - ghadames project - ajrt regulating tank 70.000m3

Engineering