Method for carrying out tower site foundation pit construction on karst landform foundation in rainy season: Fid-Bau Portal

Method for carrying out tower site foundation pit construction on karst landform foundation in rainy season

CHEN LIXIANG

The invention relates to a method for carrying out tower site foundation pit construction on a karst landform foundation in a rainy season. The method is characterized by comprising the steps of excavating a foundation pit by adopting water mill drilling or ladder-shaped alternative type blasting, pre-embedding a PVC (Poly Vinyl Chloride) water guiding pipe during foundation pit protective wall construction, and coating a pipe opening by adopting dry rice straws and a fine sand net; dividing a water ponding situation into three grades of a serious water ponding grade, a medium water ponding grade and a common water ponding grade, and excavating a karst landform foundation pit which is in the serious water ponding grade by adopting an Shallow sump drainage method; for a karst landform foundation pit which is in the mediumwater ponding grade, carrying out concrete pouring by adopting a funnel lifting and underwater concrete pouring method; for a karst landform foundation pit which is in the common water ponding grade, carrying out the concrete pouring by adopting a crane ladle water pumping concrete pouring method. According to the method disclosed by the invention, the efficiency of the tower site foundation pit construction can be effectively increased, the construction safety is increased, and the falling and the collapsing during a foundation pit construction process can be avoided.

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