A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Kaneohe/Kailua Sewer Tunnel Project, Honolulu, Hawaii, Utilization of Multiple Advanced Foundation Techniques
In February of 2014, Bencor Global Inc. (a Keller Company) was awarded a subcontract by the successful prime contractor, Southland/Mole JV, for the construction of TBM launch and retrieval shafts and a ground improvement program to facilitate construction of the conventionally mined portion of the conveyance tunnel and micro tunneling using advanced techniques including slurry wall construction by hydromill, pretreatment of jet grout columns and multi-axis jet grouting methods. Additional scope items include support of excavation and mitigation of water inflow for various structures on this challenging public project named the Kaneohe/Kailua Waste Water Conveyance and Facilities Project, owned by City and County of Honolulu, Hawaii. The prime contract consists of constructing a 4.8 kilometer long, 4 meter diameter, gravity conveyance tunnel designed to increase the reliability and capacity of the community’s sewer system. The tunnel flows from the Kaneohe Waste Water Pre-Treatment Facility down to the Kailua Regional Waste Water Treatment Plant on the eastern side of the island of Oahu. The new tunnel will provide temporary wastewater storage capacity to help prevent sewage overflows and spills, in particular during heavy rainstorm events. The prime contract is valued at approximately $175,000,000. Installation of two slurry diaphragm wall shafts was completed at each end of the tunnel. The Kailua shaft (28.3 meter dia. and 32 meter deep) was used for launching the tunnel boring machine and will also serve as the pumping station. The shaft at Kaneohe (10.4 meter dia. and 20 meters deep) was constructed for retrieval of the tunnel boring machine. The two shafts consisted of 0.9 and 1.2 meter thick steel reinforced concrete diaphragm walls which were installed utilizing slurry wall techniques by hydromill. This is the first documented use of the hydromill on the island. An extensive ground improvement program involving the installation of over 6,100 1.1 meter diameter jet grouting columns treating over 43,580 cubic meters for water tight base seals and structural support and cutoff grouting along the tunnel alignment, diversion structures, and pipelines was also designed and implemented. Jet grouting was accomplished utilizing both conventional single-axis and advanced multi-axis jet grouting techniques. Anticipated soil conditions included highly variable sequences of fill, alluvium, clays, sands and gravels, and silts requiring multiple different sets of jet grouting parameters. Additional challenges included a high groundwater table and high concentrations of organics. This paper is a case study that documents the design, installation and results of the foundation and ground improvement systems installed on the project. Specifically, the paper will address the variable ground conditions associated with the two project sites and the adjustments made to both the diaphragm wall and jet grouting operations to provide a final product to meet the intent of the project specifications.
Kaneohe/Kailua Sewer Tunnel Project, Honolulu, Hawaii, Utilization of Multiple Advanced Foundation Techniques
In February of 2014, Bencor Global Inc. (a Keller Company) was awarded a subcontract by the successful prime contractor, Southland/Mole JV, for the construction of TBM launch and retrieval shafts and a ground improvement program to facilitate construction of the conventionally mined portion of the conveyance tunnel and micro tunneling using advanced techniques including slurry wall construction by hydromill, pretreatment of jet grout columns and multi-axis jet grouting methods. Additional scope items include support of excavation and mitigation of water inflow for various structures on this challenging public project named the Kaneohe/Kailua Waste Water Conveyance and Facilities Project, owned by City and County of Honolulu, Hawaii. The prime contract consists of constructing a 4.8 kilometer long, 4 meter diameter, gravity conveyance tunnel designed to increase the reliability and capacity of the community’s sewer system. The tunnel flows from the Kaneohe Waste Water Pre-Treatment Facility down to the Kailua Regional Waste Water Treatment Plant on the eastern side of the island of Oahu. The new tunnel will provide temporary wastewater storage capacity to help prevent sewage overflows and spills, in particular during heavy rainstorm events. The prime contract is valued at approximately $175,000,000. Installation of two slurry diaphragm wall shafts was completed at each end of the tunnel. The Kailua shaft (28.3 meter dia. and 32 meter deep) was used for launching the tunnel boring machine and will also serve as the pumping station. The shaft at Kaneohe (10.4 meter dia. and 20 meters deep) was constructed for retrieval of the tunnel boring machine. The two shafts consisted of 0.9 and 1.2 meter thick steel reinforced concrete diaphragm walls which were installed utilizing slurry wall techniques by hydromill. This is the first documented use of the hydromill on the island. An extensive ground improvement program involving the installation of over 6,100 1.1 meter diameter jet grouting columns treating over 43,580 cubic meters for water tight base seals and structural support and cutoff grouting along the tunnel alignment, diversion structures, and pipelines was also designed and implemented. Jet grouting was accomplished utilizing both conventional single-axis and advanced multi-axis jet grouting techniques. Anticipated soil conditions included highly variable sequences of fill, alluvium, clays, sands and gravels, and silts requiring multiple different sets of jet grouting parameters. Additional challenges included a high groundwater table and high concentrations of organics. This paper is a case study that documents the design, installation and results of the foundation and ground improvement systems installed on the project. Specifically, the paper will address the variable ground conditions associated with the two project sites and the adjustments made to both the diaphragm wall and jet grouting operations to provide a final product to meet the intent of the project specifications.
Kaneohe/Kailua Sewer Tunnel Project, Honolulu, Hawaii, Utilization of Multiple Advanced Foundation Techniques
Bolton, Michael Kevin (author) / Neumann, Al (author) / Bean, Jeffrey J. (author)
Grouting 2017 ; 2017 ; Honolulu, Hawaii
Grouting 2017 ; 314-324
2017-07-06
Conference paper
Electronic Resource
English
| British Library Conference Proceedings | 2021
Application of the Model SPECIES to Kaneohe Bay, Oahu, Hawaii
| British Library Conference Proceedings | 1996
Sanitary sewer corrosion model for the city and county of Honolulu, Hawaii
| British Library Conference Proceedings | 1995