Views: 1124 Author: Site Editor Publish Time: 2025-10-31 Origin: Site
I. Installation Preparation: Laying a Solid Construction Foundation.
Installation preparation needs to take both equipment adaptability and on-site safety into account, with the core being the dual compliance of "site survey + equipment commissioning". First, level the site, remove obstacles, and compact the ground with a road roller. The bearing capacity must be above 120kPa to prevent equipment settlement during construction; at the same time, divide the drilling area, material storage area, and mud circulation area, and set up safety warning signs and enclosures. After the equipment arrives at the site, assemble the mast, drill pipe, and power head in accordance with the instructions, and calibrate the mast verticality deviation to not exceed 0.1%. During the commissioning phase, focus on checking the hydraulic system pressure, hoist braking performance, and instrument panel data to ensure that the main hoist lifting capacity and power head torque meet the construction design requirements. For example, pile hole construction with a diameter of 1.5 meters requires matching a hoist system with a lifting capacity of no less than 200kN.
II. Core Construction: Controlling Key Links.
The core construction process follows the standardized logic of "positioning & drilling—mud wall protection—hole cleaning & formation". Before drilling, use a total station to accurately locate the hole position, mark the crosshairs and recheck, with the deviation controlled within 5cm; select a suitable drill bit according to the geological report, use a spiral drill bit for miscellaneous fill, and replace it with an alloy-tooth cylindrical drill bit for weathered rock formations. During drilling, follow the principle of "from slow to fast", control the rotation speed at 5-8rpm within the initial drilling depth of 2 meters, and then adjust the parameters according to the soil layer after stabilization. The torque for strongly weathered rock formations should be increased to more than 220kN·m. For mud wall protection, monitor the specific gravity in real-time: control it at 1.1-1.2g/cm³ for silty clay layers and increase it to 1.2-1.3g/cm³ for sand layers; after hole formation, use the mud replacement method to clean the hole, and control the thickness of sediment at the bottom of the hole within 5cm to ensure the bearing capacity of the pile foundation.
III. Quality Control: Throughout the Construction Process.
Quality control implements a dual mechanism of "real-time monitoring + process acceptance". During construction, use an inclinometer to detect the hole verticality every 5 meters of drilling, and adjust the mast immediately if the deviation exceeds 0.3%; monitor the mud performance every hour with a mud hydrometer and sand content meter, and add bentonite in time to adjust the indicators. Implement an acceptance system for key nodes: accept the hole position and diameter after hole opening, accept the hole depth and sediment thickness after drilling to the designed depth, and recheck the protective layer thickness after the steel cage is installed. For example, in a bridge project, this mechanism detected 3 cases of excessive sediment at the hole bottom, which were reworked in time to avoid potential quality hazards of pile foundations in the later stage.
IV. Completion & Site Clearance: Standardized and Efficient Connection.
The completion work focuses on "equipment maintenance + on-site cleaning" to achieve a closed construction loop. After hole formation, clean up the mud around the drilling hole in time, recycle the reusable mud to the circulation pool, and transport the waste mud out after sedimentation treatment. Dismantle the equipment in the order of "accessories first, main body later". After removing the drill pipe and mast, check the wear of the components, replace or maintain vulnerable parts such as drill teeth and steel wire ropes, and seal them after applying anti-rust oil. At the same time, organize construction materials, including drilling records, quality inspection reports, and equipment operation logs, and submit them to the supervision unit for acceptance to ensure complete filing of materials.
