Hoisting method of folding straddle truck and device thereof

Abstract

The invention relates to a lifting method of folding gantry crane for lifting long-transmission pipeline in field with complex landforms and a lifting equipment of lifting arc-welding vehicle. The lifting arc-welding vehicle is comprised of a caterpillar bulldozer employed as a frame, a folding hydraulic hanger, a hydraulic balancing mechanism, an alternating current dynamo set, a hydraulic pipe holder and a power source of electric arc welding. Functions of lifting pipes, forking pipes, transporting pipes, cleaning pipe canals, welding pipes and carrying articles are integrated. Therefore, the vehicle is not only used as a lifting equipment, but also can be used as a multifunctional construction equipment and a low power mobile electrical supply. The invention has an essential use value in field pipeline system installment for water conservancy, electric power and petrochemical enterprises.

Description

technical field [0001] The present invention relates to a hoisting method and equipment for long-distance pipelines in water conservancy, electric power and petrochemical enterprises. Specifically, it relates to a hoisting method and equipment for hoisting long-distance pipelines in various complex terrains in the field by folding gantry cranes—hoisting arc welding car. The hoisting arc welding vehicle is composed of a crawler bulldozer, a folding hydraulic crane, a hydraulic balance mechanism, an alternator unit, a hydraulic pipe holder, and an arc welding power source. It integrates the functions of hoisting pipes, fork loading pipes, transporting pipes, cleaning pipe trenches, welding pipes and loading objects. Therefore, the vehicle can be used not only as hoisting equipment, but also as multi-functional construction equipment, and can also be used as a low-power mobile power supply. It has substantial use value in the installation of field pipeline systems in water cons...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned method of simply increasing the hoisting moment by increasing the deadweight of the crawler-type pipelayer is an uneconomical technical solution at the cost of increasing the purchase capital and fuel consumption of the crawler-type pipelayer in exchange for a disproportionate increase in lifting capacity.

There are also many deficiencies in use: to drive a large-tonnage crawler pipelayer, it is necessary to increase the power of the diesel engine and increase energy consumption; Trailer, increase the auxiliary cost of pipeline construction; in the construction of mountainous and hilly terrain, the temporary construction access road built, in order to ensure the walking of the large-tonnage crawler pipelayer, must build a solid construction access road, increase the auxiliary cost of pipeline construction

[0009] The above reasons limit the use of the existing technology to lift pipelines in the form of "cantilever cranes" and transport pipes in the form of "suspension" with booms. The use of crawler-type pipelayers in the construction of mountains, hills, deserts, and loess plateaus

Therefore, for many years, in this kind of terrain construction, pipes with a diameter of less than 325 mm have been manually unloaded and moved, which not only increases the labor intensity of workers, but also increases unsafe factors; The 325mm pipe is hoisted by a crawler-type pipelayer, and the skid-mounted carrier is used to carry the pipe. The pipe is transported from the stacking yard to the pipeline installation site, requiring multiple hoisting

It not only increases the auxiliary time for pipeline installation and construction, but also easily damages the anti-corrosion layer on the outer surface of the pipeline; in the special hoisting process of the pipeline ditch, the pipeline is hoisted in the form of a "cantilever crane". For hoisting safety, a large-tonnage crawler type must be selected. Pipelayers, 45-ton and 10-ton crawler-type pipelayers were purchased at the same time, which increased the purchase capital of hoisting equipment and fuel consumption; the pipes were transported by hanging the booms, and the pipes were transported with the terrain of mountains, hills, and loess during transportation. The ups and downs of the skid-mounted carrier will also follow the ups and downs, the stability of the load is very poor, and the risk is great. In order to transport safely, the transport speed is very slow, which increases the construction auxiliary time and fuel consumption, and ultimately increases the construction equipment purchase funds, Auxiliary construction time and pipeline construction period

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