Construction method of composite casing pipe bored pile structure close to existing metro

Abstract

The invention relates to a construction method of a composite casing pipe bored pile structure close to an existing metro. The construction method includes the steps of leveling a field, and measuringa pile placement position; placing a roadbed plates, and positioning multiple tracks; placing a casing pipe drilling machine; taking soil to form holes; placing a rotary drilling machine; carry out adrilling process; treating hole slag; clearing the holes; placing steel reinforcement cages; placing casing pipes into the steel reinforcement cages, and welding the casing pipes; pouring concrete. The construction method of the composite casing pipe bored pile structure close to the existing metro has the advantages that the casing pipe drilling machine and the rotary drilling machine are adopted to carry out construction in a cooperating mode, so that the construction method not only is good in construction quality, accurate and reliable in home forming, high in construction efficiency andthe like but also can be suitable for construction in various complex and right strata, energy and resources are saved, and pollution to environment is low; at the same time, the construction method is suitable for strata with high water levels, large cobblestones and the like, a caterpillar band chassis bears weight, ground pressure is low, and the automation degree is high. The construction method of the composite casing pipe bored pile structure close to the existing metro not only is good in stability and high in environment adaptive capacity but also saves the cost, and has excellent popularization value and application prospects.

Description

technical field [0001] The invention relates to the construction field of a composite casing bored pile structure adjacent to an existing subway, in particular to a construction method of a composite casing bored pile structure adjacent to an existing subway. Background technique [0002] With the rapid increase of population and vehicles and the continuous advancement of urbanization, the construction of subways has risen in large and medium-sized cities in my country due to its advantages of energy saving, high efficiency, comfort, and small footprint. At the same time, urban overpasses have been spread all over my country's cities due to their advantages of three-dimensional, all-round spanning and less land occupation, and more and more urban roads have been transformed into overpass lines. The adjacent construction conditions of subway tunnels and municipal bridge piles are becoming more and more common, so their mutual influence must be considered for pile-tunnel const...

AI Technical Summary

Problems solved by technology

However, the construction efficiency of the above-mentioned equipment is low. During the hole forming process, mud protection walls are required to prevent the hole from collapsing, and there is a problem of mud discharge pollution; the verticality of the pile body is only 1 / 150, and the construction noise is large. Process disadvantages such as neck and hole bottom thick residue

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