Introduction  In the coastal thermal power plant, the unit circulating cooling water system usually adopts the secondary circulation way, which needs to transfer water from the seaside to the front pool of the circulating pump house through the open water intake channel. An inverted trapezoidal section is generally used in the open water intake channel, while a rectangular section is generally used in the front pool of the circulating pump house. Therefore, the connection between the two requires an itd, which is connected from an inverted trapezoidal section to a rectangular section.

  Method  In the engineering of the past, and flow in open channel water pump room link transition section of the former pool there are many kinds of forms, the most commonly used were divided into two kinds, one kind was through the connection of reinforced concrete box culvert, another was by reinforced concrete buttressed retaining wall connection, the former for wave conditions demand was not high, the latter for demanding wave conditions.

  Result  Combined with the actual situation of the project site, a special curved surface transition scheme was innovatively proposed to connect the open water intake canal with the front pool of the pump house, and solve the connection difficulties and construction complexity of the transition section between the open water intake canal and the front pool of the pump house. This kind of special structure can not only give full play to the function of gravity retaining wall depending on backfilling soil and its own gravity resistance to sliding, but also reduce the occupied area and greatly reduce the project cost.

  Conclusion  The engineering practice proves that this new type of curved surface transition section not only satisfies the actual use function of the site, but also saves the cost of the project and facilitates the construction.