Construction process for pouring underwater concrete

The invention discloses a construction process for pouring underwater concrete, which belongs to the technical field of pile foundations, and comprises the following steps: step 1, pouring the underwater concrete by adopting a vertical lifting guide pipe method, before a guide pipe is used, carrying out a lengthening airtight test, manufacturing a guide pipe support frame by using profile steel, supporting the support frame on a drilling platform for supporting and suspending the guide pipe, 2, underwater concrete construction is conducted, concrete mixing is conducted in a unified mode through a mixing station, and concrete is transported through a tank car and poured in cooperation with a guide pipe. According to the construction technology for pouring the underwater concrete, guide pipe concrete pouring can be completed underwater, a poured pile foundation has good structural strength, foaming control is good, the integrity of the pile foundation is high, and the problems that underwater impurities and gra