Views: 1124 Author: Site Editor Publish Time: 2025-11-07 Origin: Site
Adaptive modification of auger drill pipe: Replace the traditional rotary drilling bucket with a long auger drill pipe with continuous blades. The drill pipe must have high strength and wear resistance, and the blade pitch is optimally designed according to geological conditions to ensure smooth soil discharge and stable hole wall during drilling.
Integration of grouting system: Add high-pressure grouting pump, slurry mixing tank, delivery pipeline, and flow-pressure control system. The grouting pressure should reach 1.5-3.0MPa, and the flow rate should be accurately matched with the drilling speed to avoid slurry interruption or excessive slurry.
Upgrade of control system: On the basis of the original control system of the drilling rig, add a real-time monitoring module for grouting parameters (pressure, flow rate) to realize the linkage control of drilling speed and grouting volume, ensuring the whole pile-forming process is controllable.
Improved construction efficiency: Rotary drilling rigs have strong power. After modification, the drilling speed can reach 1.5-2.5m/min, which is more than 30% higher than that of traditional CFA drilling rigs, and the construction cycle of a single pile is shortened to 1-3 hours.
Widened application range: Suitable for pile construction with diameter 600-1200mm and depth within 30m, it can cope with various geologies from soft soil to medium-dense sand layers, and can complete complex site construction without replacing equipment.
Optimized project quality: The pile formed by high-pressure grouting has high compactness, no quality defects such as mud skin and mud inclusion. The bearing capacity of a single pile is 20%-30% higher than that of traditional mud-retained piles, meeting the needs of heavy-load foundations such as high-rise buildings and bridges.
Green construction characteristics: No mud discharge throughout the process, reducing site pollution and cleaning costs, which meets the current requirements of environmental protection construction. It is especially suitable for site-restricted scenarios such as urban core areas and ecologically sensitive areas.
Urban rail transit projects: Construction of foundation pits support piles for subway stations and connecting passage foundation piles for interval tunnels, which need to balance efficiency and environmental protection. The modified rotary drilling rig can operate flexibly in narrow sites.
High-rise building foundation projects: Pile foundation construction of super high-rise buildings in soft soil areas, which needs to improve pile bearing capacity and stability. The CFA method can effectively solve the problem of foundation settlement.
Municipal road and bridge projects: Pile foundation construction in bridge head soft foundation treatment and road widening and reconstruction, adapting to the rapid construction needs under complex geological conditions.
Industrial park construction: Large-area pile foundation construction such as workshops and equipment foundations. The modified equipment can perform batch operations to reduce construction costs.
Geological survey: Before construction, conduct a detailed survey of the site geological distribution, clarify parameters such as soil layer thickness, moisture content, and compactness, and adjust construction parameters such as drill pipe pitch and grouting pressure accordingly.
Slurry preparation: Use ordinary Portland cement of P.O42.5 grade or above, control the water-cement ratio between 0.5-0.6, and the slurry mixing time shall not be less than 3 minutes to ensure the uniformity of the slurry.
Process control: Keep the drill pipe vertical during drilling, with a deviation not exceeding 1%; synchronously adjust the grouting pressure and drilling speed to avoid hole collapse or slurry loss in the hole.
Quality inspection: After pile forming, use the low-strain method to detect the integrity of the pile body, and use the static load test or high-strain method to detect the bearing capacity to ensure it meets the design requirements.
