secant piles thornton water project - windsor, …

SECANT PILES Project Report THORNTON WATER PROJECT - WINDSOR, COLORADO Owner: City of Thornton General Contractor: Sco Contracng Design/Build Specialty Contractor: Schnabel Geostructural Design & Construcon For more informaon on this project or any other of our projects please contact Schnabel at: (703) 742-0020 or visit our website at www.schnabel.com The Thornton Water Project is being constructed to deliver water from the Water Supply and Storage reservoirs north of Fort Collins to the City of Thornton, a distance over 65 miles. The path of the pipe had several river crossings that needed to be tunneled under. Schnabel was contracted to design and build the launch and receiving shaﬅs at two of these crossings and a receiving shaﬅ for a third locaon. These five shaﬅs needed to be water-ght to allow safe and effecve excavaon. The deepest of the shaﬅs was 55 feet. The subsurface condions at the 5 shaﬅs were similar. The generalized soil profile consisted of 10 to 15 feet of silty clay and sand underlain by soﬅ interbedded claystone/sandstone bedrock. The water table was 12 foot below the surface on average. A secant pile wall was chosen by the Thornton Water Project Design Team to provide excavaon support for the shaﬅs and limit groundwater in the excavaon. Schnabel was contracted to design and build the secant pile shaﬅs. A secant pile wall consists of drilling connuous overlapping concrete piers to provide a waterght, concrete wall. With the help of Schnabel Engineering, Schnabel designed the secant piles to be constructed out of plain concrete relying on only the compressive hoop strength of the pile group to resist the soil and water pressure. This design requires that close aenon be given to the vercality and structural integrity of the individual piers. To ensure adequate pier overlap, the shaﬅs had to be drilled within a 0.5% vercality tolerance. The vercality was monitored using the PRAD system to read the alignment of every hole. The volume of concrete was also monitored to ensure that the theorecal concrete volume is less than the actual volume of concrete placed; otherwise, the shaﬅ may have an inclusion from the surrounding earth that will adversely affect the structural integrity of the enre shaﬅ. Schnabel was able to successfully complete this project on me and on budget with structurally sound shaﬅs. The project totaled over 5,700 feet of vercal drilling and over 3,000 cubic yards of concrete. The construcon of the project took 5 months to complete and was finished in December of 2020.

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SECANT PILES

Project Report

THORNTON WATER PROJECT - WINDSOR, COLORADO

Owner: City of ThorntonGeneral Contractor: Scott ContractingDesign/Build Specialty Contractor:Schnabel Geostructural Design & Construction

For more information on this project or any other of our projectsplease contact Schnabel at:

(703) 742-0020 or visit our website at www.schnabel.com

The Thornton Water Project is being constructed to deliver water from the Water Supply and Storage reservoirs north of Fort Collins to the City of Thornton, a distance over 65 miles. The path of the pipe had several river crossings that needed to be tunneled under. Schnabel was contracted to design and build the launch and receiving shafts at two of these crossings and a receiving shaft for a third location. These five shafts needed to be water-tight to allow safe and effective excavation. The deepest of the shafts was 55 feet.The subsurface conditions at the 5 shafts were similar. The generalized soil profile consisted of 10 to 15 feet of silty clay and sand underlain by soft interbedded claystone/sandstone bedrock. The water table was 12 foot below the surface on average. A secant pile wall was chosen by the Thornton Water Project Design Team to provide excavation support for the shafts and limit groundwater in the excavation. Schnabel was contracted to design and build the secant pile shafts.A secant pile wall consists of drilling continuous overlapping concrete piers to provide a watertight, concrete wall. With the help of Schnabel Engineering, Schnabel designed the secant piles to be constructed out of plain concrete relying on only the compressive hoop strength of the pile group to resist the soil and water pressure. This design requires that close attention be given to the verticality and structural integrity of the individual piers.To ensure adequate pier overlap, the shafts had to be drilled within a 0.5% verticality tolerance. The verticality was monitored using the PRAD system to read the alignment of every hole. The volume of concrete was also monitored to ensure that the theoretical concrete volume is less than the actual volume of concrete placed; otherwise, the shaft may have an inclusion from the surrounding earth that will adversely affect the structural integrity of the entire shaft.Schnabel was able to successfully complete this project on time and on budget with structurally sound shafts. The project totaled over 5,700 feet of vertical drilling and over 3,000 cubic yards of concrete. The construction of the project took 5 months to complete and was finished in December of 2020.

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