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TRANSCRIPT
Building a Pump Station on the Water
April 20th 2016
DESIGN AND CONSTRUCTION CHALLENGES FOR A
RAW WATER INTAKE AT LAKE CONROE
Agenda
• Introductions
• Project Overview
• Design Challenges Encountered
• Construction Challenges Encountered
• Q&A
2
Surface Water Facilities Program Project Overview
• Supply 24 MGD Surface Water to Montgomery County
• $480 Million Total Cost– $191 Million for SWF
• Treated Surface Water Delivery by January 1, 2016
3
Surface Water Facilities Program Project Overview
• Lake Conroe Surface Water Facilities– Raw Water
Intake and Pump Station
– Surface Water Treatment Plant
– High Service Pump Station
4
Surface Water Facilities Program Project Overview
• Successful SWF Project Team– SJRA
– Three Engineers
– Construction Manager at Risk
– Construction Inspection
– 36 Contractors
– 350 Peak Workforce
5
Raw Water Intake and Pump Station Project Overview
• Located near the dam
• 300 feet long bridge– Access deep water
• Initial Capacity of 47 MGD– Planned expansion of 3 pumps
6
Design Challenges Encountered Under-Slab Items
• Pump Room Challenge– Open floor plan, accessible for O&M equipment
– Exposed platform over lake, vulnerability to weather and vandalism
• Solution– Hardened electrical conduit
7
Design Challenges Encountered Under-Slab Items
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Design Challenges Encountered Under-Slab Items
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Design Challenges Encountered Under-Slab Items
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Design Challenges Encountered Pump/Barrel Design
• Vertical Turbine Pumps Challenges– Variable Intake Elevations
– Wave Forces on Pump Columns
• Solution– Enclosed Barrels with Three Gates
11
Design Challenges Encountered Pump/Barrel Design
12
Design Challenges Encountered Pump/Barrel Design
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Design Challenges Encountered Pump/Barrel Design
14
Construction Challenges Encountered Pump/Barrel Installation
• Construction Challenge– Installation of Pumps and Barrels
• Solution– CMAR involvement/input during design phase
– Pre-work planning with CMAR
15
Construction Challenges Encountered Pump/Barrel Installation
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Construction Challenges Encountered Pump/Barrel Installation
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Construction Challenges Encountered Pump/Barrel Installation
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Construction Challenges EncounteredDrilled Shafts over Water
• Construction Challenge– Drilled shaft installation over water
• Solution– Work from inland “flexi-float” barges
– Extensive pre- and post-installation testing
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Construction Challenges EncounteredDrilled Shafts over Water
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Construction Challenges EncounteredDrilled Shafts over Water
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Construction Challenges EncounteredDrilled Shafts over Water
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Construction Challenges EncounteredDrilled Shafts over Water
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Construction Challenges EncounteredInstalling Pipes through Dam
• Construction Challenge– Install raw water line, fire protection line, sample/chemical lines, electrical
duct bank through dam embankment
• Solution– Work with CMAR to schedule work outside of hurricane season
– Extensive planning and contingencies
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Construction Challenges EncounteredInstalling Pipes through Dam
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Construction Challenges EncounteredInstalling Pipes through Dam
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Construction Challenges EncounteredInstalling Pipes through Dam
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Construction Challenges EncounteredInstalling Pipes through Dam
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Construction Challenges EncounteredInstalling Pipes through Dam
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Construction Challenges EncounteredPump Startup
• Construction Challenge– Starting up pumps without treatment plant online
• Solution– Bypass flows to lake
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Construction Challenges EncounteredPump Startup
31
Q&A
32
Contacts
• Shane Porter, PE– [email protected]
• Sam Meisner, PE– [email protected]
• Jason Ward, PE– [email protected]
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