According to different classification methods, the hoisting methods of unit engineering structures are as follows:
1. According to the hoisting sequence of components, it can be divided into single-piece hoisting method, internode hoisting method and comprehensive hoisting method.
(1) Single piece hoisting method
Piece-by-piece hoisting method refers to the method of hoisting only one component per operation of a crane in a unit hoisting project.
The main advantages of this law are:
1) The construction content is single, the preparation work is simple, the component hoisting efficiency is high, and it is easy to manage;
2) The hoisting of various components can be satisfied by changing the length of the boom (for example, using a shorter boom hanging column and hanging the roof truss after extending the boom).
The main disadvantages are:
1) The crane travels frequently;
2) Can't create a working face for the next working procedure as soon as possible according to the internode;
3) Auxiliary hoisting equipment is often needed for roof panel hoisting.
(2) internode hoisting method
Sectional hoisting method refers to the hoisting method of hoisting all or most of various types of components in one trip of the crane.
The main advantages of this law are:
1) The traveling route of the crane is short;
2) Create a working face for the next working procedure according to the internode as soon as possible.
The main disadvantages are:
1) It is required to choose a crane with heavy weight, and its boom length should meet the requirement of lifting various components at one time, so that the technical performance of the crane cannot be fully exerted;
2) All kinds of components must be transported to the site for stacking, and the hoisting rigging is frequently replaced and the management is complicated.
In general, the method of hoisting all components of a house by a crane at one time is only used in the following situations:
1) When hoisting some special structures (such as portal structures);
2) When using some cranes that are difficult to move (such as mast cranes).
(3) Comprehensive hoisting method
Comprehensive hoisting method refers to the method of hoisting some components in a building in sections and hoisting some components in sections. This method absorbs the advantages of segmental hoisting method and internode hoisting method, and is a common method in building structures. The common practice is: hoisting columns, inter-column supports, crane beams and other components in one piece; All members of the roof are hoisted by internode hoisting method.
2. According to the walking route of the crane, it can be divided into cross-span hoisting method and cross-span hoisting method, and it is selected according to the lifting capacity of the crane and the actual situation of site construction.
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