33results about How to "Reduced demolition workload" patented technology

The invention discloses an elevator shaft scaffolding tool, which comprises a main beam (1), a steel I-beam (2), and is characterized by also comprising crab claws (3), pin shafts (4) and crab claw supports (5), wherein the main beam (1) and the steel I-beam (2) form a floor of the elevator shaft scaffolding tool. The crab claws supports (5) are welded at two ends of the main beam (1) and are connected with the crab claws (3). The structure can effectively reduce workload of and racks used in building and detaching the scaffolding tool in an elevator shaft as well as construction cost.

The invention discloses an out-of-cabin method for overhauling of a ship main engine and belongs to the technical field of ship construction. The out-of-cabin method comprises the following steps thatfirstly, a first set of hoisting holes, a second set of hoisting holes and a third set of hoisting holes are formed in a hull; secondly, the main engine is hoisted from the interior of a main enginecabin to a deck of a helicopter hanger through a first crane; thirdly, through alternate hoisting of the first crane and a floating crane, the main engine is moved into the helicopter hanger; and fourthly, through a winch, a channel steel rail and a carrying trolley, the main engine is moved to a flight deck. The out-of-cabin method is easy to grasp, the time and labor are saved, the workload of out-of-cabin operation of the main engine is reduced, and the defect that the main engine is prone to being damaged due to the fact that other methods are used in the out-of-cabin process can be avoided; and the out-of-cabin method has the characteristics of being easy to operate, safe and reliable, can be applied to overhauling out-of-cabin operation of the 3000 T ship main engine and can also beused for reference for civil ships.

The invention provides a method for excavating a combined vertical erection branch part of a super-large rocky section tunnel steel frame rock wall. The method includes the specific steps that an excavation section of a tunnel is set, wherein an upper left pilot tunnel is a first excavation part, an upper right pilot tunnel is a second excavation part, the upper left pilot tunnel and the upper right pilot tunnel constitute an upper excavation section, a lower left pilot tunnel is a third excavation part, a lower right pilot tunnel is a fourth excavation part, a rock wall body is a fifth excavation part, the lower left pilot tunnel, the lower right pilot tunnel and the rock wall constitute a lower excavation part, and besides, a first supporting and protecting part, a second supporting andprotecting part, a third supporting and protecting part, a fourth supporting and protecting part and a fifth supporting and protecting part are included; the various excavation parts are excavated inturn, and primary support and protection is conducted on the corresponding supporting and protecting parts; in the entire excavation process, the second excavation part is kept lagging behind the first excavation part, the third excavation part lags behind the second excavation part, and the fourth excavation part lags behind the third excavation part. According to the method, large-scale machinery is convenient to work in the case of a super-large section tunnel, the excavation speed is fast, and the economic benefit is obvious.