Pile Instrumentation

Our team of dedicated specialists offers customized foundation testing services through decades of experience, coupled with modern technology.

Our Range of Foundation Testing Services:

  • Instrumented pile static load test
    • STRAND Method
    • Vibrating wire strain gauge method
  • Lateral pile load test
  • Bi-directional pile load test
  • Dynamic pile test
    • High strain dynamic test (PDA & CAPWAP)
  • Pile Integrity test
    • Low strain integrity test (PIT)
    • Cross-hole sonic logging (CSL)
  • And other related services

Instrumented Pile Static Load Test

The purpose of an Instrumented Pile Load Test is to obtain the load distribution of soil along pile shaft.

STRAND Method

Instrumented static pile load tests are conducted to determine the soil parameters in order to verify and optimize the design of the foundation for a structure.
STRAND Method using Geokon USA Model A-9 retrievable anchors attached with high precision vibrating wire sensors. The instrumentation for STRAND Method is done after the pile installation which ensures 100% output from all installed sensors. The sensor levels can be customized to the as build depth of the pile. STRAND Method can measure segmental shortening and strain over an entire section of test pile during each step of loading during the static load test. No additional multiple Tell Tales are required for monitoring pile shortening. All dimensions of Bored Pile, Spun Piles and RC piles with embedded access pipes can be tested using STRAND Method efficiently and cost effectively.

Vibrating wire strain gauge method

The instrumentation consists of placement of strain gauges at selected levels of the test pile to determine the load at that location for each load applied to the pile head. From the measured strain, the forces in the pile can be calculated, and thus the load distribution along pile shaft is known.

Lateral Pile Load Test

This test often requires custom setup due to the way the load is applied to the pile and large horizontal displacement during the test. The pile may be instrumented with strain gauges and an inclinometer to determine the load distribution, deflection and bending moment profiles of the pile during the test.

Bi-directional Pile Load Test

Bi-directional pile load test is an innovative method, by means of reaction from the soil, performed using hydraulic jacks pre-installed in the pile shaft to separate the pile shaft and toe loading behavior. The result is analyzed to assess the capacity of the pile, its construction and long-term performance.

Dynamic Pile Test

Dynamic Pile Test is a reliable, fast, cost-effective and non-destructive method of testing deep foundations to obtain information about their capacity and integrity.

High strain dynamic test (PDA & CAPWAP)

The high strain dynamic testing, on the other hand, utilizes a heavy impact or pile driving hammer, a pair of strain transducers and accelerometers attached to the pile shaft. These sensors are connected to the Pile Driving Analyzer (PDA) which records, processes and displays the data and results upon the impact of the hammer onto the pile. A further analysis using the CAPWAP (Case Pile Wave Analysis Program) is done with the data obtained after the test is completed, to verify the integrity and capacity of the pile.

Pile Integrity test

Low strain integrity test

The low strain integrity testing adopts lightweight handheld equipment comprising of a small impact hammer, an accelerometer attached onto the pile top and a Pile Integrity Tester (PIT) to quickly evaluate the shaft integrity of a pile, through the response from the hammer impact.

Cross-hole Sonic Logging (CSL)

Cross-hole Sonic Logging (CSL) is a method to verify the integrity of drilled shafts and other concrete piles.

CSL normally requires steel access tubes tied to the rebar cage and installed in the drilled shaft. The cage is then lowered into the hole and the concrete is placed.

After the concrete has cured, the tubes are filled with water as an intermediate medium, in which a sound source and receiver are then lowered, maintaining a consistent elevation between source and sensor. A signal generator generates a sonic pulse from the emitter which is recorded by the sensor. Relative energy, waveform and differential time are recorded, and logged. This procedure is repeated at regular intervals throughout the pile and then mapped. By comparing the graphs from the various combinations of access tubes, a qualitative idea of the structural soundness of the concrete throughout the pile can be obtained.

Other related services

  • Rental of load cells
  • Calibration of hydraulic jacks and load cells
  • Rental of data-loggers, test monitoring and data collection
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