Piling beam cofferdam construction method used for bare rock foundation construction in water

Abstract

The invention discloses a piling beam cofferdam construction method used for bare rock foundation construction in water. The construction method provided by the invention is characterized in that the cofferdam is formed through multiple piling beams which are successively closely connected, the cofferdam is firmly embeded in the bare rock in water and the piling beam cofferdam is used for constructing a cushion cap foundation in water; the construction method comprises the following steps: firstly, determining cofferdam structural size and construction location; secondly, hole-drilling construction of an installing groove on cofferdam bottom: adopting impulse type drilling equipment to drill multiple occlusion drill holes and correspondingly forming the installing groove used for fixing the cofferdam bottom along the periphery of the cofferdam; thirdly, installing groove backfilling construction of the cofferdam bottom: adopting river sand to backfill the installing groove; and fourthly, cofferdam construction: carrying out inserting piling and fold construction on the multiple piling beams, and forming a close cofferdam after the fold. The construction method provided by the invention has the advantages of simple steps, lower construction cost, high construction efficiency and good construction effect, and solves the construction problem that the piling beam cofferdam can not be directly embed in a river bed of the bare rock.

Description

technical field [0001] The invention belongs to the technical field of foundation construction in water, and in particular relates to a method for constructing steel sheet pile cofferdams for bare rock foundation construction in water. Background technique [0002] Steel sheet pile cofferdam is a commonly used construction method in bridge foundation construction. It mainly uses the strong rigidity and good water-proof function of steel sheet pile to provide support for foundation pit excavation in water or high groundwater level. Realize the safe operation of construction personnel and equipment in the dry cofferdam. When the steel sheet pile cofferdam is actually constructed, the depth of the steel sheet pile embedded below the ground of the foundation pit is the most important factor affecting the safety and stability of the entire cofferdam. The shallower the embedded depth of the steel sheet pile, the less safe the cofferdam. However, in bare rock riverbeds, especially...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a steel sheet pile cofferdam construction method for bare rock foundation construction in water, which has simple steps, low construction cost, high construction efficiency and good construction effect. , which solves the construction problem that the steel sheet pile cofferdam cannot be directly embedded in the bare rock riverbed

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