Trenchless Technology

NOV 2018

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W W W.T R E N C H L E S S T EC H N O LO GY.C O M 31 N O R T H A M E R I C A N M I C R O T U N N E L I N G 2 0 1 8 R E V I E W SA N J UA N C A P I S T R A N O Trampas Canyon Dam and Reservoir Vadnais Trenchless Services Inc. This $1.75 million project consists of a 688-lf microtunnel drive of 63-in. OD Permalok steel casing with 30-in. welded steel carrier piping . Shafts for the microtunneling will be between 22 and 26 ft deep and are of heavy- duty trench shield construction. The microtunnel will be installed within the Santiago formation consisting primarily of weak sandstone with interbeds of moderately hard sandy siltstone and claystone. The tunnel will be approximately 12 ft below the groundwater table. This tunnel is being installed through the West Saddle Dam of the Trampas Canyon Reservoir. The tun- nel will serve as the inlet/outlet pipe- line for filling and draining the res- ervoir to satisfy the water district 's needs. Mobilization began on Aug . 1, 2018, and will be complete by the end of the year. Owner: Santa Margarita Water Dis- trict; Prime Contractor: Sukut Con- struction; Engineer: AECOM; Equip - ment : Iseki TCC1350 MTBM (63-in. OD). M A R I N A D E L R E Y Venice Dual Force Main and Venice Pumping Plant Generator Replacement Project Vadnais Trenchless Services Inc. This $88.89 million project involves the construction of a new 54-in. di- ameter force main sewer extending approximately 10,392 lf, which origi- nates from a newly constructed mani- fold adjacent to an existing pumping plant . From the manifold the align- ment will proceed east , then south- easterly and cross beneath the Marina Del Rey and Ballona Creek channels, continue traveling south within Pa- cific Avenue and ends at the Coastal Interceptor/ North Outfall Sewer (CIS/ NOS) Junction structure. The majority (~9,450 lf ) of the new 54-in. line will be constructed using microtunneling . Most of the micro - tunneling will be direct-jacked RCCP and approximately 2,800 lf of 80-in. Permalok Casing with RCCP carrier will also be installed. The cut-and- cover construction method will be used for the remaining 900 lf. The project also consists of the de- molition of the existing equipment and procurement and installation of new generators, along with ancil - lary controller, transfer switches, plus exhaust and cooling systems at the Venice Pumping Plant . Two new 750 kW (480 V) generators, and one new 1,500 kW (480 V) generator with com- plete emissions control systems and fluid storage will be furnished and installed. The entire alignment and large scope of work along with several dif- ferent shaft construction techniques make this an extremely challenging project . Award on the project was made in February 2017 and physical work began in May 2017. The project is scheduled to be complete by February 2020. It was 41% complete at the end of September. Owner: City of Los Angeles Depart- ment of Public Works; Engineer: City of Los Angeles Engineering ; Equip - ment : MTS 1500 Microtunnel System (70-in. OD), MTS 1650 Microtunnel System (70-in. OD), MTS 1850 Micro - tunnel System (80-in. OD). COLORADO B R I G H TO N Brighton North Outfall - Phase 2 BTrenchless BTrenchless crews are using an Ak- kerman SL60 skinned up to 72 in. in diameter to complete a 600-ft drive through poorly graded sand with some clays and fine gravel . The pipe being used in Permalok steel casing , 70.5-in. ID/72-in. OD in 20-ft lengths. This will be the second drive for the new SL60 MTBM. Personnel - Shawn August (Project Manager), Don Meyer (Superinten- dent), Joe Barger (Supervisor), Randy Starck, Brandon Lindberg , London Anderson, Edgardo Iraheta, Dan- iel Molina, Bryson Dick and Sean Vasquez . D E N V E R Globeville Landing Outfall Phase 3 Bradshaw Construction Corp. This $2.781 million job consisted of twin 96-in. RPMP drives (515 lf ) un- der UPRR and RTD rail lines in dense sand, silt and clay 15 to 20 ft below the surface. This represents Brad- shaw 's largest diameter MTBM project in company history. Extra challenges included limited site restrictions, tight schedule and encountered util - ity conflicts. The project began in February 2018 and completed in June 2018. Owner: City & County of Denver; Contractor: Kiewit Infrastructure Co.; Engineer: Merrick & Co.; Equipment : RASA DH-1900 MTBM (skinned up to 100.75-in. OD). Bradshaw Project Manager: Matt Webb. CONNECTICUT W E T H E R S F I E L D Sanitary Sewer Improvements: Goff Brook Overflow Closure Bradshaw Construction Corp. Construction is in progress now for a $5.787 million, 60-in. microtunneling / conventional TBM project for 30- and 48-in. FRP sanitary sewer installations. 1,850 lf of 60-in. steel casing will be installed over four drives with a Her- renknecht AVN-1200 MTBM, with the longest drive totaling 850 lf. Ground conditions for microtunneling opera- tions have varied from predominantly siltstone to dense sand and gravel, with groundwater. An additional 650 ft has been installed behind an Akker- man WM480 TBM in wet clay. An ad- ditional 500 ft tunnel of 48-in. RCP has been recently added to the project by change order, and will be installed on an 1,170-ft radius curve. This tun- nel will begin in siltstone and progress through silty sand and gravel. The project began in October 2017 and is approximately 75 percent com- pleted. Owner: Metropolitan District Com- mission; Contractor: Baltazar Con- tractors Inc.; Engineer: CH2M/Jacobs; Equipment : Herrenknecht AVN-1200, Akkerman WM480. Bradshaw Project Manager: Jordan Bradshaw. M I C R O T U N N E L I N G J O B L O G 2 0 1 8

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