Dynamic Pile Monitoring Report Proposed SH 146 Bridge Over Houston Ship Channel, Harris County, Texas
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1985-12-01
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Abstract:Field demonstrations for Demonstration Project 66, "Design and Construction of Driven Pile Foundations," include (1) dynamic pile monitoring by pile analyzer (field computer), and (2) static pile load testing using a mobile pile load test frame. The equipment and technical assistance are made available to a requesting State highway department. A request for a field demonstration and use of the dynamic testing equipment was received from the Texas State Department of Highways and Public Transportation (SDHPT) in June 1985. SDHPT had decided to perform a comprehensive design stage pile load test program for the proposed SH 146 Bridge over Houston Ship Channel (Baytown Bridge). The Federal Highway Administration (FHWA) agreed to provide the dynamic monitoring equipment, and personnel and technical assistance. SDHPT's District 12 office obtained services of McClelland Engineers and Raymond International Builders, Inc. for the design and implementation of the load test program. The purpose for the load test program was (1) to install and load test different pile types at two locations, (this was done in order to select the appropriate pile types), (2) to determine design pile load capacities, and (3) to assess pile performance during driving. Pile analyzer was used to demonstrate the use of newer and more accurate techniques for determining pile load capacity during driving, to measure driving stresses generated in the pile (pile damage control) and to assess the efficiency of the driving system. The field work (pile driving and dynamic testing) for load test site number 1 - south side of ship channel) was performed during October-November 1985. The dynamic tests were performed by Mr. H. Clark, Civil Engineering Technician in the Demonstrations Projects Division, and Mr. S. Vanikar, Geotechnical Engineer in the Geotechnical and Materials Branch. McClelland Engineers designed the load test program and performed the wave equation analysis. Driven piles were installed by Raymond International Builders, Inc. On October 31, 1985, after the dynamic testing of initial pile driving for the steel and concrete piles at load test site number 1 was completed, an informal presentation on the results of the dynamic testing was made to SDHPT and FHWA engineers. Also present at the meeting were representatives of McClelland Engineers Inc. and- Raymond International Builders, Inc. The concrete and steel piles were retapped on November 8, 1985 and pile analyzer was used during retapping. A detailed description of the work performed, test results, and recommendations follow in this report.
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