The anchoring machine mast can be adjusted to fit the needs of the site in any direction.Ī temporary steel casing with a water flush system must be drilled into the ground. To fulfill the needs of the design and the site, adjust the swing mast to the desired inclination. Install the anchor machine at a level that is roughly equal to the anchor head. The tie-back anchors must be installed using strong anchoring equipment, and the procedure described below must be followed. Each anchor’s load and dimensioning are constructed according to the design’s detailed specifications. In order to react to the loading system during the static compression testing setup, tie-back anchors must be fitted. The ground anchors attached back to the crown will serve as the response system for all compression test piles. 4.3 Compression Load Test Setup 4.3.1 Hydraulic jack acting against anchored crown reaction frame to apply load to pile To create a bearing surface perpendicular to the pile’s axis, the pile head should be removed or raised to the required elevation and capped. The test pile’s immediate surroundings should, whenever practical, be excavated to the proposed pile cut-off elevation. Procedure for Pile Load Test 4.1 Generalīefore a test, relevant project data, such as soil boring logs, pile installation records, and concrete qualities, must be examined and recorded. ” To digitally record the applied load transfer from the hydraulic jack to the pile head, the load cell must be linked to the data logger. To determine the force exerted on the transducer, the output of the transducer is entered into an algorithm. The electrical signal output typically ranges from a few millivolts to a few volts. Four strain gauges are often arranged in a Wheatstone bridge configuration to form a load cell. The deformation (strain) is converted to electrical impulses via the strain gauge. A strain gauge is deformed by the force being measured through a mechanical setup.
This conversion takes place in two steps and is indirect. 3.3 Load CellsĪ transducer called a load cell is used to transform a force into an electrical signal. When performing a static axial compression test, the displacement transducers must be connected in order to digitally measure the pile head movement. Equipment/Apparatus 3.1 Data loggerĪ Data logger will be used to record the strain gauge data. For a pile, a relationship between settling and load can be found. Use and SignificanceĪ pile is subjected to a loading test in order to determine the settlement that can be anticipated at the estimated working load, or some multiple thereof, as well as the pile’s ultimate bearing capacity and structural soundness. No matter how big or how they were installed, all deep foundation units must pass this test. The Maintained Load Test Procedure is the second type of test, in which the load is gradually increased to a multiple of the working load, such as 1.5 times or twice that amount, with the time-settlement curve being recorded at each stage of loading and unloading load.īy gradually raising the load, the Maintained Load (ML) test can likewise be performed until it fails. The first of these tests is called the Constant Rate of Penetration (CRP) test, in which the compressive force is gradually raised to make the pile continuously penetrate the soil up until failure. Compressive loading on piles is tested using two main categories. This pile load test method describes how to test vertical piles to see how they react to static compressive loads that are applied axially to the pile. A static pile load test is performed to measure how a pile behaves under an applied load.
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