The Pile Driving Monitor (PDM) uses optically safe infrared lasers to track a disposable reflective sticker adhered directly to the pile. Because the maximum pile movement occurs before the ground vibrations reach the PDM, and the final set measurement is taken after the vibrations have passed, the set and temporary compression measurements are accurate to ±0.1mm or better at a distance of 10m from the pile.
In many countries, the current practice for accepting piles requires the measurement of set and sometimes Temporary Compression (TC) on the pile during installation. Working in close proximity to piling hammers presents significant safety risks to personnel, such as high noise and falling debris from hammers, leaders or spalling concrete from the pile head.
The PDM eliminates the need for workers to stand under working piling hammers while measuring set, a significant improvement to the health and safety of workers on driven piling projects. The combined speed, accuracy, and improved safety allow for all foundation elements to be tested during the installation process.
The use of a PDM in combination with a ”Pile Driving Analyzer® (PDA)” on driven piling projects represents a second wave of monitoring which provides an integrated approach to providing an unprecedented level of quality assurance to every pile. It also provides a pathway to verification and sign-off of the whole foundation system.
The PDM has the following features and applications:
Recording of pile set and temporary compression while protecting the health and safety of site personnel
Monitoring of marine piles from a fixed platform
The PDM has been designed from the ground up to be construction-friendly—robust, user-friendly and efficient. The PDM can be mounted on a tripod or placed on the ground 5m to 15m from the pile. For an experienced operator, the time for a PDM test is comparable to taking a traditional set card measurement.
The Pile Driving Monitor (PDM) software comes preloaded onto a Microsoft Surface Pro 3 tablet PC, provided with every PDM. Communication between the Tablet and PDM is wireless to maximize flexibility and minimize trip hazards on site, and provide the opportunity for the tablet to be cabin-mounted. An option for connection via USB cable is also provided.
Weights (including battery): 4kg
Dimensions (width, height, depth): 172 x 200 x 342 mm
Operating Temperature: -10˚ to +40˚C
IP Classification: IP65
Optics Transmitters: 4 pcs IR-LED
Measuring FOV (Field of View): 50 mrad (vertical, 50 cm / 10 m)
Pointers: 2 pcs Class 2 visible laser, 635m
Reflector: 3M Diamond Grade tape, optimally 6 to 50 m from PDM
Extended Range (<6m – >10m): Tape reduced or increased in width accordingly
Sampling Rate: 100 – 400 Hz
Static measurement range: ± 50˚
Battery (removable): Ultralife UBBL25, Li-ion 10.8V, 4.8Ah
Charger: Mascot 2240LI/3CELL
WLAN: Lantronix xPico Wi-Fi
USB: LTW, B-type female connector (IP68)
USB cable included: 5m
PDM run time: up to 24 hours
Offset Distance Range: 5m to 15 m maximum from pile
Recommended range: 6m to 10 m from pile
From horizontal plane: 1V : 10H
From vertical plane: 1H : 10V
Accelerometer, Tilt & Rotate
Current Consumption (12 V, typ.)
Secure connection: Standard WPA2, password protected
Anti-amendment report: Key values of the site report (input identification and output results) are encrypted into a QR code. Through current validation, utility authorities can tell whether or not a report is modified.
Class 2 Laser-Device: Classification IEC 60825-1:2007
Class 2: “visible-light lasers (400 – 700nm) limited to maximum 1 MW continuous wave”
Recommended Maximum Rotational Deviations
Recommended Accuracy in Offset: 10mm or better
Notional Displacement Accuracy: ± 0.1 mm within recommended range
Notional Velocity Accuracy: ± 0.1m/s within recommended rage and at 1kHz conditioning frequency
Recommended Mounting: Solid placement on sand bag on ground or on survey tripod
Sampling Rate for Pile Monitoring: 4000H ± 0.2%
WARNINGS AND CLASSIFICATION