Pile Dynamic analyzer

PILE DYNAMIC ANALYZER MODEL PAX

1Erandi H. Chandanayake

BSc. Eng. Civil & Infrastructure

SETTING UP THE PAX

2

1. On-off switch

2. Pilot lamp

3. 12 Volt DC input

4. Blow count extension cord input

5. Piezoelectric (PE) main cable input

6. External monitor output

7. Network input

8. USP inputs – 02 no.

9. Piezo resistive (PR) main cable input

10.Battery charger input

11.12 Volt DC output 3

PDA

PDA-L

PDA-R4

CONDENSED SETUP SCREEN

5

MAIN MENU

6

COLLECTING DATA – OVERVIEW

7

PILE INFORMATION SCREEN

PROJECT PILE HAMMER SENSORS SAMPLING

8

PROJECT TAB

• PJ – PROJECT NAME

• PN – PILE NAME

• PD-PILE DESCRIPTION

• OP-OPERATOR NAME

• LI-LENGHTH OF PENETRATION INCREMENT

• LP-LENGTH OF PENETRATION

9

PILE TAB• AR-CROSS SECTIONAL AREA AT GAGES LOCATION

• LE-LENGTH OF FOUNDATION FROM THE GAGES LOCATION TO THE TOE

• EM-ELASTIC MODULUS OF THE FOUNDATION MATERIAL AT THE GAGES

LOCATION

• SP-SPECIFIC WEIGHT OF THE FOUNDATION MATERIAL AT THE GAGES

LOCATION

• WS-WAVE SPEED

• JC-CASE DAMPING FACTOR

10

HAMMER TAB• CUSTOM HAMMER –

MAKER

NAME

RAM WEIGHT

ENERGY

HAMMER TYPE - INTERNAL COMBUSTION

OPEN END DIESEL

CLOSED END DIESEL

EXTERNAL COMBUSTION

HYDRO BLOCK

VIBRATORY

• HAMMER FROM THE LIST -> SELECT MAKER -> OK 11

Max BPM - MAXIMUM BLOWS PER MINUTE

RATE

This is the rate at which the PAX will be able to acquire data.

If the hammer runs at the rate higher than the Max BPM , then some

blows will not be recorded.

12

SENSORS TAB

08

Channel

Operation

13

Sampling tab allows choosing the sampling frequency and the number of

samples stored for each blow.

Sample Frequency 40, 20, 10, 7, 5, 4, 3, 2.5 kHz

The rate at which analog signals are converted to digital signal is known as

sample frequency.

Sampling size 1024 ,2048 ,4096

Total time stored = sample size x ( 1 / sample frequency )

eg.: T.T.S. = 2048x (1/10000) = 204.8 ms

The Pretrigger Buffer Time specifies the amount of data that will be recorded,

corresponding to the information detected by the sensor just prior to the

triggering.

SAMPLING TAB

14

BALANCING GAGES

15

Prior to the acquiring data ,the sensor offsets should be

checked.

“CAUTION” POP UP

16

MAIN COLLECT SCREEN

17

PAX is in

stand by

position

Flashing

button

1

2Generate a

calibration

signal

CALIBRATION SIGNAL

18

The actual image some

times may not same as

this because of

different scale settings

19Vertical Scale Horizontal Scale

Browsing saved data

Adjusting Sensor

Properties

Special Function

Input parameters

REFERENCES • PDAL USER’S MANUAL – NOVEMBER 2008 (PILE DYNAMICS

,INC.)

• HAMMER TYPES, EFFICIENCIES AND MODELS IN GRLWEAP

F. Rausche and A. Klesney

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~ THANK YOU ~