The construction method of excavating large - scale rock foundation pits with double - blade mining cutting machines is a specific construction method in the field of building construction for efficient and accurate excavation of large - scale rock foundation pits. The following is a detailed introduction from multiple aspects such as characteristics, application scope, and process principles:

Characteristics of the Construction Method


  • High cutting accuracy: The double - blade design enables more precise control of the cutting position and depth, ensuring the dimensional accuracy of the foundation pit and the flatness of the wall surface, and reducing over - excavation and under - excavation phenomena.
  • Higher construction efficiency: Compared with some traditional rock - breaking and excavation methods, such as blasting or small - scale mechanical breaking, the double - blade mining cutting machine can perform continuous cutting operations and complete the cutting of a large area of rock in a relatively short time, accelerating the construction progress.
  • Less impact on the surroundings: The cutting process is relatively quiet, generating less vibration and shock waves, and also having less impact on the buildings, underground pipelines and other facilities around the foundation pit. It is suitable for construction areas with high environmental requirements.
  • Good safety: It avoids safety risks such as flying stones and explosion shocks brought by blasting operations, providing a safer working environment for the construction site.

Application Scope


It is applicable to the excavation projects of various large - scale rock foundation pits, such as the foundation pits of high - rise buildings, the equipment foundation pits of large - scale industrial buildings, and the foundation pits of bridges. It is widely used in urban construction, large - scale infrastructure construction and other projects.

Process Principle


The two cutting discs of the double - blade mining cutting machine perform grinding and cutting on the rock in a high - speed rotation mode. High - hardness cutting blades are inlaid on the cutting discs. Driven by strong power, the blades are in close contact with the rock surface, breaking and peeling the rock layer by layer, so as to achieve the purpose of excavating the foundation pit. At the same time, the supporting cooling system will cool the cutting discs and the cutting parts during the cutting process to prevent the cutting discs from overheating and wearing, and ensure the continuous and stable progress of the cutting.

Construction Process Flow and Operation Key Points


  • Construction preparation: Before construction, a detailed investigation of the construction site is required, including geological conditions, the distribution of underground pipelines, etc. According to the design requirements, carry out surveying and setting out, determine the excavation boundary and elevation of the foundation pit, and complete the site leveling work. At the same time, inspect and debug the double - blade mining cutting machine equipment to ensure its good performance.
  • Cutting path planning: According to the shape, size of the foundation pit and the characteristics of the rock, plan a reasonable cutting path. The cutting path should try to avoid frequent turns and stops to improve the cutting efficiency and quality. Generally, a segmented and layered cutting method is adopted, first carrying out large - area cutting, and then performing fine processing on the corner parts.
  • Cutting operation: Move the double - blade mining cutting machine to the starting position of cutting, adjust the height and angle of the cutting discs, and start the equipment for cutting. During the cutting process, strictly control the cutting speed and the depth of the cutting tool, and adjust the parameters in a timely manner according to the hardness of the rock and the cutting situation. At the same time, keep the cooling system running normally to ensure that the temperature of the cutting discs is within a reasonable range.
  • Rock cleaning: As the cutting progresses, clean up the rock fragments and waste residues generated by the cutting in a timely manner, keep the construction site clean, and avoid the accumulation of fragments from affecting the cutting operation. The cleaned - up rocks can be reasonably utilized or properly disposed of according to the actual situation.
  • Quality inspection and trimming: After completing a section of cutting or the cutting of the entire foundation pit, inspect the size, flatness and perpendicularity of the foundation pit. If any parts that do not meet the design requirements are found, trim them in a timely manner to ensure that the quality of the foundation pit meets the standards.

Materials and Equipment


  • Materials: The main consumed material is the blades on the cutting discs. Blades with reliable quality and good wear - resistance should be selected to ensure the cutting effect and the service life of the cutting discs.
  • Equipment: The double - blade mining cutting machine is the core equipment. Corresponding transport vehicles are also required for the removal of rock fragments, as well as measuring instruments such as total stations and levels for construction measurement and quality inspection.

Quality Control


Follow relevant construction quality acceptance codes and standards for building foundation pit engineering, such as the Code for Acceptance of Construction Quality of Building Foundation Engineering (GB 50202).
Regularly maintain and calibrate the cutting equipment to ensure its cutting accuracy and stability. During the construction process, strengthen the monitoring and adjustment of the cutting parameters to ensure the consistency of the cutting quality.

Safety Measures


Carry out professional training and safety education for operators, so that they are familiar with the operating procedures and safety precautions of the equipment, and work on the job with relevant certificates.
Set up obvious safety warning signs at the construction site and isolate and protect dangerous areas. When the equipment is running, it is strictly prohibited for unauthorized personnel to enter the operation radius.

Environmental Protection Measures


The waste water generated during the cutting process contains a large amount of rock debris. A special waste - water treatment system should be set up to precipitate and filter the waste water, and discharge it after it meets the standards to prevent pollution to the surrounding water environment.
Take effective dust - reduction measures, such as equipping water - sprinkling trucks or spray dust - reduction equipment in the cutting area, to reduce the dust flying during the cutting process and protect the atmospheric environment.