In this paper, the selective characteristics of the codend by cover net method were compared with those by the parallel haul method based on the square mesh codends with the mesh sizes of 25, 30, 35, 40 and 45mm respectively.

The parallel-cross operation method application in shaft excavation and building starting prior period

the relationship of parallel operations of excavation and bolting integration is researched.

However, in order to decrease the construction time as much as possible, this paper put forword a parallel operation method in which the above three steps can be done simultaneously.

The paper introduces the construction technology of adopting artificial and mechanical shaft sinking as well as a parallel operations in concrete pouring construction with whole sliding-mode to replace the traditional way of the sole artificial construction in the past,thus realizing improvement of rapid construction craft.

The parallel work of every branch engineering on the watercourse renovating engineering has importance significance for saving invest and shortening time for a project.

Basementterrace is constructed by top—down construction in heapstead with basement by steel platform operation in an enclosed space in order tomake sure parallel working of civil engineering andmine construction.