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Characteristics and regulations of steel structure installation technology

table of Contents:Corporate newsPublished:2019-06-15 09:11:17Click to rate:

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Steel structure is one of the common structural forms in modern construction engineering. The application of steel structure engineering installation technology is more and more extensive in our country, and many advantages of steel structure are also paid attention to, so the application of steel structure engineering is increased. This paper analyzes the installation technical requirements of steel structure engineering, so as to strengthen the technical application and management of steel structure engineering and ensure the safety and reliability of the whole steel structure engineering.

Single - layer portal frame installation

The single-span structure should be hoisted from one side to the other side, the middle to both ends or the order of both ends to the middle. For multi-span structure, it is advisable to lift the main span first and the rear side span first; When there are more than one crane working together, can also be hoisted at the same time across. Single-layer portal frame steel structure, should be installed according to column, link beam, column support, crane beam, roof frame, purlin, roof support, roof plate order. In the installation process of portal frame structure, temporary inter-column support or stable cable wind rope should be installed in time, and the installation can be extended after the formation of spatial structural stability system. The spatial structural stability system should be able to withstand the structural dead weight, wind load, snow load, seismic action, installation load and impact load during hoisting.

Multi-storey and high-rise steel structure engineering installation

(1) the installation of multilayer and high-rise steel structures should be divided into multiple flow sections for installation, and the flow section should take each section as a unit. The division of flow sections shall meet the following requirements:

1) the heaviest component in the flowing water section should be within the lifting capacity of the hoisting machinery;

2) the climbing height of lifting equipment should meet the lifting height of components in the lower throttling section;

3) the length of the column in each throttling section shall be determined according to factory processing, transportation stacking, on-site hoisting and other factors. The length shall be 2 to 3 floor heights, and the section position shall be 1.0 to 1.3m above the elevation of beam floor;

4) the division of flow section of steel structure should be adapted to the installation of concrete structure;

5) each throttling water section can be divided into flowing water zones for installation on the plane according to structural characteristics and field conditions. (2) the hoisting of components in the flow section shall conform to the following provisions:

1) lifting can adopt the sequence of column first and beam second, or partial column first and beam second; A single column shall not be in cantilever state for a long time;

2) the installation of steel floor plates and molded metal plates shall be synchronized with the lifting progress of components;

3) the hoisting sequence in the special flow section shall be determined according to the installation process and shall meet the requirements of the design document.

(iii) the installation and calibration of multi-storey and high-rise steel structures shall be carried out according to the reference column and meet the following requirements:

1) the reference column should be able to control the plane size of the building and facilitate the calibration of other columns.

2) proper measuring instruments and calibration tools should be used for steel column calibration;

3) after the calibration of the reference column, the other columns should be calibrated.

(iv) when installing multi-storey and high-storey steel structures, the floor elevation can be controlled by relative elevation or design standard height, and should meet the following requirements:

1) when the design elevation control is adopted, the column elevation adjustment shall be carried out on the basis of each column, and the elevation of each column shall meet the design requirements;

2) the allowable deviation of the total height of the building and the height difference of each column in the same floor shall conform to the relevant provisions of the current national standard GB50205, code for acceptance of steel structure engineering installation quality.

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