A kind of group tower crane with jib

Abstract

The invention provides a group tower type crane with an auxiliary boom, which comprises a steel structure base, a jacking sleeve frame, a tower body, an attaching frame, an attaching steel wire rope, a rotary support device, a main boom, an auxiliary boom, a main hook, an auxiliary hook, a support rod, a tower head, a main boom luffing mechanism, an auxiliary boom luffing mechanism, a hoisting mechanism, a balance arm, a balance weight and a control chamber, wherein one end of the main boom is hinged on the rotary support device, and makes a pitching movement in a vertical plane around a hinge point under the drawing of the main boom luffing mechanism, the other end of the main boom is connected with the main hook and the auxiliary boom, one end of the auxiliary boom is fixedly connected with the lower end of the support rod, the other end of the auxiliary boom is connected with the auxiliary hook, and the auxiliary boom and the support rod are integrally hinged on the end part of the main boom, and make a pitching movement in the vertical plane around the hinge point under the drawing of the auxiliary boom luffing mechanism. Through additionally providing the auxiliary boom, the working amplitude of a tower crane is greatly improved; and the group tower type crane is especially suitable for assembling construction of an extra-high voltage iron tower which is longer in length of a cross arm and larger in weight.

Description

technical field [0001] The invention belongs to the field of construction equipment for overhead transmission lines, and in particular relates to a special tower crane with a jib for erecting transmission line iron towers. Background technique [0002] The erection construction of poles and towers is a construction link with heavy workload, high construction difficulty and many risk factors in the construction of transmission lines. At present, large mobile cranes or helicopters are mainly used for tower construction in foreign countries. For example, the United States, Canada and other countries have generally used large mobile cranes or helicopters for tower construction, while the main equipment for domestic tower construction is various forms of poles. The poles for power transmission and transformation construction (including single poles, rocker poles, etc.) are light and small lifting equipment. They are simple lifting equipment commonly used in the construction of ov...

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Problems solved by technology

[0004] In the prior art, there is also a tower crane developed by China Electric Power Research Institute, which adopts the design scheme of single boom and no balance arm, and is applied in the construction of UHV transmission lines. Short arm length (simply lengthening the boom will lead to a significant increase in the overall weight), lack of installation of balance arms and other deficiencies, resulting in a large cross-sectional size and weight of the tower body, which cannot meet the needs of UHV lines with long cross-arms and heavy-weight iron towers. immediate need

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