Bore Pile

To build the simulation models for the piling process, construction steps have to be defined in detail. Depicts the detailed construction steps of the piling process starting from the axis adjustment to concrete pouring and finishing the pile. The construction steps can be summarized as follows:

1. Adjust the piling machine on the pile axis.

2. Haul with the auger to the drilling place.

3. Start drilling until the auger is filled.

4. Return from the drilling level to the top of the pile hole.

5. Swing to the unloading area.

6. Unload the dirt in the unloading area.

7. Swing back to the top of the hole.

8. Repeat steps 2 to 7 until the pile is completely drilled.

9. Relocate the machine and start steps 1 to 8.

10. Start erecting the rebar cage using a crane.

11. Erect the concrete pouring tool, either funnel or tremie, into the hole.

12. Use funnel for dry method and tremie for wet method.

13. Start pouring the concrete and finish the pile.

Simulation models are designed to determine the productivity of this process. Both piling machine and crane activities’ times have to be assessed so that the time required to constructing the pile is defined. The drill rig is responsible for performing the activities: axis adjustment, drilling, and machine relocation. The crane is responsible for the rest of the activities.

Drilling has six main activities: hauling to the drilling location, loading the auger (drilling), returning to the top of the hole, swing to unload area, unload dirt, and swing back to the top of the hole. The pile has to be divided into equal small depth segments (d) to facilitate cycle time calculation.

The cycle time at the beginning of the drill sequence is, of course, different from that as the hole increases in depth. To consider this concept, the segment depth (d) has to be tiny so that the cycle time difference between the upper and lower segment’s edges is small. Therefore, it is assumed that the cycle time is the same throughout the depth of the hole. Hence, the cycle time at the center of each depth segment represents the cycle time through the entire segment. Video 1 shows that the pile is divided into small equal depth segments to facilitate productivity determination.