Compound Extruded Expanded Pile Forming Equipment
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Solution Overview
Problem
Existing pile-forming methods face challenges such as high construction costs, energy consumption, environmental pollution, and complex procedures, particularly in forming piles with variable sections, which affect bearing capacity, settlement, and efficiency, especially in complex geological conditions.
Innovation Solution
A pile-forming method and equipment for compound extruded and expanded piles that involve drilling, extruding, and expanding a bore with a drill stem and expansion bodies, allowing for continuous extrusion and expansion, reduced torque requirements, and efficient concrete filling without pre-forming a bore, enabling the formation of various pile types with enhanced bearing capacity and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a bore is pre-formed before forming a pile, then the pile-forming procedure becomes more complex and time-consuming, but the bearing capacity can be improved
Solution Approach 1:
The patent combines bore formation and pile formation into a single integrated operation. The drill stem with expansion bodies forms the bore and then expands in-situ to create the pile body directly, eliminating the need for separate bore formation, cleaning, and pile construction steps. This merging of operations reduces procedural complexity while maintaining bearing capacity through the variable section design.
Solution Approach 2:
The drill stem serves multiple functions: it drills the bore, extrudes the variable section shape, and forms the final pile body through expansion. This multi-functional tool eliminates the need for separate equipment for bore formation and pile construction, simplifying the overall procedure while achieving the desired bearing capacity.
2Ease of operation
If soil is removed during extrusion and expansion, then the extrusion process becomes easier, but environmental pollution occurs due to transported soil
Solution Approach 1:
The patent converts the potentially harmful effect of soil displacement into a beneficial compaction effect. Instead of removing soil during extrusion and expansion, the process compacts the soil around the pile, improving soil density and bearing capacity while eliminating pollution from transported soil. The soil displacement is harnessed to create a compacted zone that enhances pile performance.
3Ease of manufacture
If the extruding and expanding arm distracts at the most unfavorable operation angle, then the extrusion can be achieved, but the root portion easily breaks or damages
Solution Approach 1:
The patent inverts the traditional extrusion approach by expanding the pile body upward from the bottom during withdrawal, rather than extruding downward from the top. This reversal changes the operation angle to a more favorable position, reducing bending moments and preventing damage to the root portion while achieving the desired extrusion and expansion.
Solution Approach 2:
The expansion bodies are designed to expand dynamically during the withdrawal process, adapting to soil conditions and reducing mechanical stresses on the drill stem. The gradual expansion during withdrawal distributes forces more evenly, preventing sudden loads that could cause root portion damage.
4Force
If multiple hydraulic cylinders are hinged for extrusion and expansion, then the extrusion force is sufficient, but high control preciseness is required and mechanical failure is easy to occur
Solution Approach 1:
The expansion bodies utilize the upward withdrawal force of the drill stem to drive their own expansion, eliminating the need for complex hydraulic cylinder systems. The mechanical design of the expansion bodies allows them to self-expand as the drill stem is withdrawn, converting the withdrawal motion directly into expansion force without requiring external hydraulic control systems.
5Manufacturing precision
If a bore is pre-formed and cleaned before placing reinforcement cage and pouring concrete, then the pile quality is improved, but the construction time and costs increase
Solution Approach 1:
The patent merges bore formation, pile body formation, and concrete pouring into a single continuous operation. The drill stem forms the bore and expands in-situ to create the pile body shape, then concrete is poured through the hollow drill stem as it is withdrawn. This eliminates separate steps for bore cleaning, reinforcement cage placement, and concrete pouring, significantly reducing construction time while maintaining pile quality through the controlled expansion process.
Solution Approach 2:
The variable section shape is pre-formed on the drill stem expansion bodies before entering the ground. This preliminary shaping action ensures that the pile body is formed with the correct geometry during expansion, eliminating the need for subsequent shaping operations or reinforcement cage placement, thereby reducing construction time while maintaining structural quality.
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
The method and equipment improve bearing capacity, reduce settlement, lower construction costs, and enhance efficiency while minimizing environmental impact, allowing for quicker construction and better pile quality under complex geological conditions.
Implementation Method 1
the drilling machine for piling work is started up to apply a torque in a clockwise direction and a downward axial pressure, and use a drilling tool of the pile-forming equipment for a compound extruded and expanded pile to drill, extrude, and expand to form a bore
Implementation Method 2
after formation of the bore for the pile is completed through mechanical extrusion and expansion, the drilling machine for piling work is started up to rotate anticlockwise in situ, so that the formed bore is further expanded and extruded by the expansion bodies of the equipment
Implementation Method 3
starting up a concrete pump while the drilling tool of the pile-forming equipment for a compound extruded and expanded pile starts to be upwardly rotated and lifted, wherein under effect of pressure of the concrete pump, the inner sleeve is separated from the outer sleeve, and the inner sleeve slides in the sliding groove
Data Source
AI summary
A pile-forming method for a compound extruded and expanded pile, comprising using a compound extrusion and expansion drilling tool of pile-forming equipment for a compound extruded and expanded pile to drill, extrude, and expand to form a bore, wherein when upwardly rotating and lifting, expansion bodies of the compound extrusion and expansion drilling tool enlarge, and at the same time, a concrete pump is started up to pour a pile material under pressure into the pore for the pile, to reach a pile top mark height, obtaining a compound extruded and expanded pile. Pile-forming equipment for a compound extruded and expanded pile is also disclosed, comprising a compound extrusion and expansion drilling tool and a control system thereof. The compound extrusion and expansion drilling tool comprises a drill stem. A plurality of expansion bodies are provided on a threaded section of a drill bit of the drill stem.