Karst area foundation pit drainage treatment method in construction

The invention discloses a karst area foundation pit drainage treatment method in construction, which comprises the following steps of: arranging a water collecting well outside a foundation pit foundation range, introducing water flow at a water outlet into the water collecting well through a drainage blind ditch, installing a water pump in the water collecting well to drain accumulated water in time, and covering the top of the drainage blind ditch with a concrete prefabricated cover plate; a dry construction environment is provided for working procedures such as foundation concrete pouring; and after foundation pouring is completed, grouting is conducted through the pre-buried grouting steel pipe and the early-strength and high-strength underwater grouting material. The system and the method are simple in type and easy to operate, and compared with other methods such as direct grouting of the water outlet, the method is safer and more reliable, construction is convenient, and the construction period is shor