Nested Pile Testing Device With Sliding Coupling Assembly
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Solution Overview
Problem
Existing pile testing devices are limited in their ability to efficiently represent various screw pile configurations and facilitate rapid deployment and recovery, which hinders reliable ground condition testing.
Innovation Solution
A pile testing device comprising an outer pile member with a helical flight and an inner pile member, a coupling assembly for simultaneous insertion and sliding, and a jack for applying longitudinal force, along with sensors for displacement measurement, allowing for rapid deployment and testing of ground conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single pile member is used for testing, then the device structure is simple, but the ability to represent various screw pile configurations and enable rapid deployment is limited
Solution Approach 1:
The inner pile member is nested within the outer pile member, with the inner member having a diameter smaller than the outer member's inner diameter. This nesting arrangement allows both pile members to be simultaneously driven into the ground while maintaining a compact structure, enabling rapid deployment without significantly increasing overall device complexity
Solution Approach 2:
The testing device is divided into separate functional components: an outer pile member with external helical flight for ground engagement, and an inner pile member with internal helical flight for rotational coupling. This segmentation allows each component to perform its specific function efficiently while together providing versatile testing capabilities for various screw pile configurations
2Productivity
If pile members are inserted separately, then the insertion process is simple, but the deployment time increases and reliability of testing results decreases
Solution Approach 1:
The coupling assembly merges the inner and outer pile members into a unified structure during insertion, allowing both members to be simultaneously driven into the ground as one unit. This combining approach enables rapid simultaneous insertion without requiring complex separate insertion procedures, improving deployment speed while maintaining structural integrity through the coupling mechanism
3Measurement precision
If the inner pile member is fixed to the outer pile member, then structural stability is high, but the ability to measure relative displacement is lost
Solution Approach 1:
The coupling assembly transitions from a fixed state during insertion to a movable state during testing. The guide slots and guide fasteners enable controlled relative longitudinal displacement between the inner and outer pile members while preventing rotational displacement, allowing accurate measurement of longitudinal displacement without compromising rotational stability
4Measurement precision
If complex coupling mechanisms are used to allow relative movement, then displacement measurement is enabled, but the device complexity increases
Solution Approach 1:
The guide fasteners act as intermediaries between the inner and outer pile members, engaging with guide slots to enable controlled relative movement. This intermediary mechanism provides precise displacement measurement capability through a relatively simple structure, avoiding the need for complex coupling mechanisms while maintaining measurement accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and reliable testing of ground conditions by allowing simultaneous insertion and removal of pile members, providing accurate displacement measurements, and accommodating different pile configurations through interchangeable helical flights and modular sections.
Implementation Method 1
a jack adapted to be coupled between the top end of the outer pile member and a top end of the inner pile member so as to apply a longitudinal force to the pile members acting to longitudinal displace one of the pile members relative to the other pile member
Implementation Method 2
a sensor adapted to measure longitudinal displacement of at least one of the pile members relative to either one of the other pile member or the ground
Implementation Method 3
an outer pile member comprising a tube which is elongate in a longitudinal direction between opposing top and bottom ends of the outer pile member and a helical flight mounted externally on the tube
Data Source
AI summary
A pile testing device for testing ground includes (i) a tubular outer pile member having a helical flight mounted externally thereon, (ii) an inner pile member received within the second pile, (iii) a coupling assembly operable between an inserting position in which the inner pile member and the outer pile member are joined in fixed relation to one another so as to be arranged to be simultaneously driven into the ground and a testing position in which the inner pile member is longitudinally slidable relative to the outer pile member within a prescribed axial range but in which the inner pile member remains coupled to rotate together with the outer pile member, (iv) a jack coupled between top ends of the inner and outer pile members, and (v) a sensor adapted to measure longitudinal displacement of one of the pile members relative to the other pile member or the ground.