Method of power management in pile foundation having a base machine and an attachment installed thereat

• US 10,704,219 B2
• Filed: 02/26/2019
• Issued: 07/07/2020
• Est. Priority Date: 02/26/2018
• Status: Active Grant

• Current Assignee: Liebherr-Werk Nenzing GmbH (Liebherr-International AG)
• Original Assignee: Liebherr-Werk Nenzing GmbH (Liebherr-International AG)
• Inventors: Schlatter, Nicola, Jussel, Patrick
• Primary Examiner(s): Fiorello, Benjamin F
• Application Number:
  US16/286,268
• Publication Number:
  US 20190264413A1
• Time in Patent Office: 497 Days
• CPC Class Codes: E02D 13/00 Accessories for placing or removing piles or bulkheads , e.g. noise attenuating chambers
• CPC Class Codes: E02D 2250/00 Production methods
• CPC Class Codes: E02D 2600/00 Miscellaneous
• CPC Class Codes: E02D 7/18 Placing by vibrating vibrators for soil compacting E02D3/046
• CPC Class Codes: E02D 7/26 Placing by using several means simultaneously
• CPC Class Codes: E02D 7/28 Placing of hollow pipes or mould pipes by means arranged inside the piles or pipes E02D13/08 takes precedence
• CPC Class Codes: E21B 7/20 Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Abstract

The present invention relates to a method of power management during pile foundation having a base machine for excavating a borehole and an attachment installed at the base machine for a simultaneous introduction of a casing into the ground, wherein the energy supply for the attachment is at least partially provided by the base machine and a control of the base machine dynamically regulates the energy flow from the base machine to the attachment.

Claims

1. A method of power management during preparation of a pile having a base machine for excavating a borehole and an attachment installed at the base machine for a simultaneous introduction of a casing into a ground, wherein an energy supply for the attachment is at least partially provided by the base machine, the method comprising:

stepwise or continuously regulating, with a control of the base machine, energy flow from the base machine to the attachment including increasing energy supply to the attachment and decreasing energy supply to the base machine when a required excavation energy is low.

2. The method of claim 1, wherein regulating the energy flow comprises regulating the energy flow according to a current power requirement of the base machine and/or of the attachment.

3. The method of claim 1, further comprising limiting or completely stopping the energy flow to the attachment, wherein the limiting of the energy flow is stepwise or continuous.

4. The method of claim 1, further comprising communicating, with the control of the base machine, a request for a power reduction to the attachment over a communication interface.

5. The method of claim 4, wherein the request includes an instruction on worksteps of the attachment to be carried out.

6. The method of claim 5, wherein the instruction includes a specification and/or recommendation with respect to worksteps to be carried out and/or not to be carried out.

7. The method of claim 1, further comprising actively controlling a process time for worksteps of the attachment and/or of the base machine by means of the regulation of the energy flow.

8. The method of claim 1, wherein a depth difference between a depth of earth excavation and a casing depth is taken into account for the regulation, with the depth difference optionally being held above and/or below a lower and/or higher limit value by the regulation of the energy flow.

9. The method of claim 1, further comprising detecting, with the attachment, an advance speed of the casing.

10. The method of claim 9, further comprising detecting the advance speed of the casing while taking account of the depth change of the casing over time, and requesting, based on the advance speed, an increase of the energy flow from the base machine to the attachment over a communication interface and/or initiating a work process to place a further pipe onto the casing.

11. A method of power management during preparation of a pile having a base machine for excavating a borehole and an attachment installed at the base machine for a simultaneous introduction of a casing into a ground, wherein an energy supply for the attachment is at least partially provided by the base machine, the method comprising:

stepwise or continuously regulating, with a control of the base machine, energy flow from the base machine to the attachment;

wherein a depth difference between a depth of earth excavation and a casing depth is taken into account for the regulation, with the depth difference optionally being held above and/or below a lower and/or higher limit value by the regulation of the energy flow; and

restricting the energy flow to the attachment if the casing depth is larger by at least a limit amount than an excavation depth, and/or further comprising increasing or maximizing the energy flow to the attachment if the excavation depth is larger by at least a limit amount than the casing depth.

12. The method of claim 11, wherein a cost function U is defined as a function of the depth difference that defines an average power proportion to be output to the attachment in dependence on the depth difference.

13. The method of claim 12, further comprising dynamically setting the energy flow to the attachment on a basis of the average power proportion while further taking account of a cyclic excavation process of the base machine.

14. The method of claim 13, wherein dynamically setting the energy flow to the attachment on the basis of the average power proportion while further taking account of the cyclic excavation process of the base machine comprises multiplying an average power value by a weighting parameter that characterizes a current process step during the cyclic excavation process.

15. The method of claim 14, wherein the weighting parameter is smaller during digging and lifting of an excavation tool and is larger during lowering and emptying of the excavation tool.

16. The method of claim 11, wherein the attachment sets an oscillation angle of the attachment configured as a casing oscillator while taking account of a current power consumption of the attachment and/or in dependence on the casing depth and/or in dependence on the excavation depth.

17. A system, comprising:

a base machine including an excavating assembly for excavating a borehole,

at least one attachment installed at the base machine independent from the excavating assembly for introduction of a casing into a ground simultaneously with the excavating assembly, wherein an energy supply for the at least one attachment is at least partially provided by the base machine; and

at least one control for stepwise or continuously regulating energy flow from the base machine to the at least one attachment.

18. The system of claim 17, wherein the base machine comprises a cable excavator or a drilling rig.

19. The system of claim 17, wherein the at least one attachment comprises a casing oscillator or a casing rotator.

20. The system of claim 17, wherein the at least one control stepwise or continuously regulates the energy flow according to a current power requirement of the base machine and/or of the at least one attachment.