Spiral Implantation of Precast Uplift Piles
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Solution Overview
Problem
Existing uplift pile construction methods face challenges such as long construction periods, low efficiency, significant environmental impact, high geological requirements, easy damage to pile bodies, and the risk of pile explosion during sinking.
Innovation Solution
A construction method for uplift piles that combines cast-in-place and precast pile techniques, involving measuring and positioning, drilling a pile hole, pouring a curable material, and spirally implanting a precast pile body with screw-in structures to enhance friction and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cast-in-place construction process is used for uplift piles, then the pile can be formed in situ, but the construction process becomes complex and the construction period is extended
Solution Approach 1:
The construction process is segmented into distinct phases: drilling the pile hole, pouring curable material, and then implanting the precast pile body. This segmentation allows each step to be optimized independently and reduces the overall construction time by enabling parallel preparation of pile bodies while holes are being drilled.
Solution Approach 2:
The precast pile bodies are prepared in advance off-site before being implanted into the drilled holes. This preliminary action eliminates the time-consuming on-site pile formation process and allows for quality control during manufacturing, thereby reducing the construction period while maintaining ease of installation.
2Productivity
If traditional precast pile sinking methods (hammer piling) are used, then the pile can be installed quickly, but the pile body is easily damaged and the surrounding environment is significantly impacted
Solution Approach 1:
The traditional hammer piling mechanical impact method is replaced with a spiral implanting method using a drilling device. This substitution eliminates the harmful impact forces that cause pile body damage and reduce environmental disturbance while maintaining installation efficiency through the rotational drilling action.
Solution Approach 2:
The curable material poured into the pile hole serves as an intermediary medium that facilitates the implantation of the precast pile body. This material allows the pile to be installed without direct mechanical impact, reducing damage to the pile body and minimizing environmental impact while still enabling secure installation.
3Object-affected harmful factors
If static piling method is used for precast piles, then the pile can be installed with minimal environmental impact, but the pile cannot be driven into hard rock stratum
Solution Approach 1:
The implantation method transitions from static piling to a dynamic spiral drilling process. The rotating drilling device with cutters can adapt to varying geological conditions, including hard rock stratum, by adjusting drilling parameters while maintaining minimal environmental impact characteristic of static installation methods.
Solution Approach 2:
The drilling parameters (rotational speed, feed rate, cutter configuration) can be changed to adapt to different geological conditions. This allows the same spiral implanting method to effectively install piles in both soft soils and hard rock stratum, greatly enhancing geological adaptability while maintaining low environmental impact.
4Productivity
If precast piles are used with screw-in structures, then the pile can be spirally implanted into the pile hole, but the pile hole must be drilled beforehand
Solution Approach 1:
The pile hole drilling operation and the pile implantation operation are merged into a single integrated process. The drilling device that creates the hole immediately installs the precast pile body with screw-in structures in the same operational sequence, eliminating separate steps and improving construction efficiency while managing process complexity through integration.
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
This method reduces construction noise and environmental impact, improves construction efficiency, enhances the integrity and durability of the uplift piles, and increases the ultimate uplift bearing capacity while reducing engineering costs.
Implementation Method 1
pouring a curable material in the pile hole; before the curable material is consolidated
Implementation Method 2
The uplift pile mainly relies on the friction between pile body and stratum to resist axial force and bear vertical uplift force
Data Source
AI summary
Provided is a construction method for an uplift pile, including the following steps: Step one, measuring and positioning to obtain an accurate construction site of an uplift pile; Step two, constructing a pile hole underground at the construction site; Step three, pouring a curable material in the pile hole; and Step four, spirally implanting a precast pile body into the pile hole before the curable material is consolidated. The precast pile body is provided with multiple groups of screw-in structures at intervals in an axial direction for screwing the precast pile body into the pile hole, thus solving the disadvantages of long construction period and low construction efficiency in the existing monolithic cast-in-place construction of uplift piles, and the technical problems of great environmental impact, high geological requirements, easy damage to pile body, and easy pile explosion in a pile sinking mode of a precast pile.