| URN | etd-0806124-120857 | Statistics | This thesis had been viewed 49 times. Download 0 times. |
| Author | Yi-Hsuan Lai | ||
| Author's Email Address | No Public. | ||
| Department | Department of construction & spatial design | ||
| Year | 2023 | Semester | 2 |
| Degree | Master | Type of Document | Master's Thesis |
| Language | zh-TW.Big5 Chinese | Page Count | 78 |
| Title | Discussion of All Casing Pile Foundation Engineering:A Case Study of the Malun Bridge in Yilan | ||
| Keyword | |||
| Abstract | This study investigates the comprehensive full casing pile foundation construction in the Maron Bridge reconstruction project. It provides a detailed description of the project overview, geographic location, current conditions, and geological, meteorological, and hydrological conditions. Located in Datong Township, Yilan County, the project covers approximately 779.12 meters of roadway and 510 meters of bridge segment. The geological strata primarily consist of gray gravel, sand layers, and shale. The climate is subtropical with rainfall concentrated in the autumn and winter seasons, and the potential impact of typhoons on construction must be considered. The construction methodology is thoroughly described, detailing the process of using all casing methods for pile foundation construction and the relevant machinery, such as hydraulic oscillators, hammer grab buckets, and impact hammers. The construction steps include pile positioning, steel casing installation and adjustment, grab excavation, rebar cage lifting, Tremie pipe usage, and concrete pouring, along with quality control measures and self-quality management during the construction process. The performance of pile foundations is often determined through load tests, which provide the safety factors for pile construction and verify the pile-soil system's mechanical load-bearing requirements. According to the non-destructive pile integrity test using six-quadrant analysis, the Maron Bridge in Yilan County consists of 76 piles with a diameter of 150 cm and a depth of 20.0 meters. The concrete pouring cross-sections are excellent, and the quality is classified as (A) excellent homogeneous concrete. The load test for Pier P4 was conducted as a test pile using three analytical methods: the log R0-log So method, So-log t method, and ˇµSo/ˇµlog t-R0 method. The study concluded that no significant inflection point was observed at the maximum load of 1260.0 tons, indicating that the load did not reach the yield load, thus meeting the design requirements. The study results indicate the suitability of full casing pile foundations as follows: 1. The casing wall does not collapse. 2. Ensures the completeness of the pile cross-section. 3. Easier removal of residual soil. 4. Suitable for gravel layers and hard geological conditions such as bedrock. The research shows that within 30 meters below the surface, the geological layer consists of gravel, while beyond 30 meters, it consists of shale and bedrock. It is recommended to use full casing piles according to different landforms, geology, and terrain to choose the appropriate construction method. The suitability of full casing piles includes non-collapsing casing walls, complete pile cross-sections, easy residual soil removal, and suitability for gravel layers and bedrock. Key points for full casing construction include the difficulty of extracting casings in thick sand layers, limitations on pile diameter, significant space and site requirements, and potential rebar cage flotation. |
||
| Advisor Committee | |||
| Files | indicate access worldwide | ||
| Date of Defense | 2024-07-05 | Date of Submission | 2024-08-06 |