Open caisson for mechanical excavation of barrier lake sluice channel and excavation method

Abstract

The invention relates to an open caisson for mechanical excavation of a barrier lake sluice channel and an excavation method. The open caisson is characterized by being placed vertically, the open caisson is provided with an open bottom and openings on the two longitudinal sides, the open caisson is composed of a skeleton, an upper supporting beam, a lower supporting beam, enclosure plates, a transfer device and a safety patio, the enclosure plates are installed on the two transverse sides and at the top of the skeleton, the enclosure plates longitudinally enclose the skeleton into open caisson passages, the safety patio is installed at the top of the skeleton and communicates with the open caisson passages, a conveyor belt of the transfer device is longitudinally arranged in the open caisson passages, and the multiple open caisson passages are longitudinally spliced to form a sluice channel passage. The excavation method includes the following steps of open shallow slot excavation, open caisson structure installation, stake driving and excavation in the first stage and second stage, and lower supporting beam installation and stake pulling out and recycling. The earthwork excavatedvolume is greatly decreased, the grooving time is shortened, the section of open put slope excavation is an inverted trapezoid with narrow bottom and wide top, and the excavation section of the opencaisson type excavation method is rectangular, so that the cross section area is greatly decreased.

Description

technical field [0001] The invention relates to disaster reduction technology, in particular to a caisson and an excavation method for mechanical excavation of a dammed lake discharge channel. Background technique [0002] A barrier lake is a kind of large-scale landslides, avalanches and mudslides caused by earthquakes, rainfall and ice melting. Geological disasters such as landslides, landslides and debris flows form a barrier body in the river channel, and the barrier body blocks the river channel and stores water to form a lake. Large-scale dams are tens of meters high and hundreds of meters long. If they are not dealt with in time, the water level in the reservoir will rise, which will not only submerge upstream villages, roads and farmland, etc., but dams with loose structures and poor stability are likely to collapse, causing serious damage to the downstream. Huge flood disasters, and the higher the water level, the greater the storage capacity, and the greater the lo...

AI Technical Summary

Problems solved by technology

There are many deficiencies in this excavation method: one is that the excavation volume is large, which increases the number of excavation machines, prolongs the excavation time, wastes valuable emergency disposal time, and also increases the difficulty of soil storage; the other is There are safety risks for on-site rescue personnel, which mainly come from the secondary landslide collapse of the mountain and the instability of the artificial slope of the discharge channel; third, during the discharge process, the erosion of the discharge channel by the water flow is random and uncontrollable, and it is easy to form Huge flood discharge peak, endangering downstream

Images