Construction solution for narrow space of rotary drilling rig for pile foundation engineering in the renovation of old urban areas

    The renovation of old urban areas is the core link of urban renewal, and pile foundation engineering serves as the foundation support for the renovation project. Due to factors such as dense existing buildings, narrow roads, and complex pipelines in the urban area, the construction space is extremely limited, and traditional pile foundation construction equipment is difficult to adapt to. The rotary drilling rig, with its advantages of flexibility, efficiency, and high drilling quality, has become the preferred equipment for pile foundation construction in narrow spaces in old urban areas through targeted renovation and process optimization, effectively solving construction problems and improving construction efficiency.

    The core pain points of pile foundation construction in narrow spaces of old urban areas are concentrated in three aspects: restricted equipment access, insufficient working space, and significant construction interference. Most old urban streets and alleys have a width of less than 5 meters, and the surrounding old buildings are closely spaced, making it difficult for large construction equipment to enter the site normally; At the same time, underground water supply, power supply, gas and other pipelines are dense, and pile foundation construction needs to avoid the risk of pipeline damage and further compress the working space; In addition, the construction area is adjacent to residential areas, which also puts forward higher requirements for construction noise, dust control, and construction efficiency. Traditional equipment such as impact drills are no longer able to meet the on-site construction needs.

    In response to the above pain points, the rotary drilling rig has formed an exclusive solution suitable for small spaces in old urban areas through equipment miniaturization and construction process optimization. In terms of equipment renovation, focus on miniaturization and lightweight upgrading, optimize the structure of the drilling rig body, shorten the length and width of the body, reduce the height of the equipment, and adapt to the needs of narrow streets and alleys and close range operations; At the same time, the auxiliary equipment of the drilling rig is simplified by using foldable drill rods and bodies to reduce equipment space occupation, ensuring that drilling operations can still be carried out normally in areas where the distance between buildings is less than 3 meters. The equipment operation is flexible, and the drilling angle can be accurately adjusted to avoid hidden dangers in underground pipelines.

    In terms of construction technology, combined with the geological characteristics of old urban areas (mostly mixed fill soil, silty clay, locally mixed with construction waste), targeted drilling technology is adopted, and the selection of drilling tools is optimized. Small wear-resistant drill buckets are selected to reduce soil disturbance during drilling and avoid sinking of surrounding buildings; Simultaneously adopting dry drilling or wet drilling processes, flexible switching can be made according to on-site space and environmental requirements. Dry drilling can effectively control dust pollution, while wet drilling can improve drilling quality and adapt to different geological conditions. In addition, small lifting equipment is used to assist in the transportation of drill rods and steel cages, replacing traditional large lifting equipment, further saving work space and improving construction continuity.

    In addition to equipment and process optimization, the improvement of on-site control measures is also the key to ensuring safe and efficient construction in narrow spaces. Before construction, accurately survey the distribution of underground pipelines, delineate safe operation areas, clarify the boundaries of drilling operations, and avoid construction interference; During the construction process, intelligent monitoring equipment is used to monitor the drilling speed, verticality, and settlement of surrounding buildings in real time, and adjust construction parameters in a timely manner; Simultaneously optimize the construction process, implement segmented operations and staggered construction, and reduce the impact on surrounding residents.

    Overall, the rotary drilling rig has effectively solved many problems in the construction of pile foundations in narrow spaces in old urban areas through miniaturization, process optimization, and refined control, while balancing construction efficiency, quality, and safety. With the acceleration of urban renewal process, rotary drilling rigs adapted to narrow spaces will further upgrade towards intelligence and refinement, continuously optimize solutions based on actual on-site scenarios, and provide stronger support for the efficient promotion of pile foundation projects in the renovation of old urban areas.