Construction method for concrete diaphragm wall of deep bedrock

Abstract

The invention discloses a construction method for a concrete diaphragm wall of a deep bedrock. The construction method for the concrete diaphragm wall of the deep bedrock comprises the step that when an ultra-wide pipeline incapable of being moved or modified exists, trough-forming construction is conducted on the trough section of the concrete diaphragm wall below the ultra-wide pipeline, specially, pipeline protectors are arranged around the ultra-wide pipeline so that the ultra-wide pipeline can be protected in a surrounded mode; soil below the ultra-wide pipeline is excavated out by a long-boom excavator; the rest of soil or rock below the ultra-wide pipeline is drilled through a nonequilibrium drilling method so that a trough can be formed in the concrete diaphragm wall below the ultra-wide pipeline; and three steel reinforcement cages are arranged in the trough, and one of the three steel reinforcement cages can be located under the ultra-wide pipeline. According to the construction method, the ultra-wide pipeline does not need to be moved or modified, the moving and modification cost is omitted, and the project progress is accelerated; a frictional drill bit is adopted for drilling hard bedrock, especially large-dip-angle steep rock, jamming of the drill bit during pore-forming is controlled, and the drilling efficiency is improved; and an intra-trough slurry circulating method is applied in the drilling process, the construction efficiency in the environment of deep hard rock is improved, and the trough forming quality is ensured.

Description

Technical field [0001] The invention relates to the technical field of civil engineering and construction engineering, in particular to a construction method of a connecting wall in a deep and thick bedrock ground. Background technique [0002] In the prior art, building construction often encounters various situations and geological conditions, such as the construction of deep and hard bedrock with an overburden of a few meters, a rock thickness of more than 20 meters, a rock hardness of up to 132MPa, and a pipeline group that exceeds the diameter of the drill bit. Due to the extremely complex construction environment of the enclosure structure under such geological conditions, sometimes the ground connecting wall project may be close to high-rise buildings, and the underground pipelines are dense, the anchor rods and cables are crossing, and the wall passing through the hard bedrock has a large thickness and high strength. Therefore, the construction is extremely difficult, and...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, various situations and geological conditions are often encountered in building construction, such as the construction of deep and hard bedrock with a covering layer of several meters, a rock thickness of more than 20 meters, a rock hardness of up to 132 MPa, and a pipeline group whose width exceeds the diameter of the drill bit. Due to the extremely complex construction environment of the enclosure structure under such geological conditions, sometimes the ground connection wall project may be close to high-rise buildings, and the underground pipelines are dense, the anchor rods and anchor cables span across, and the wall passes through the hard bedrock with large thickness and high strength. Therefore, the construction is extremely difficult, and how to safely, efficiently, and high-quality complete the construction of the wall of the enclosure structure, how to implement the project construction smoothly, and ensure the construction period have become problems that need to be solved urgently by engineering experts.

Images