Overall lifting construction of large span steel structure aircraft hangar roof

The steel structure aircraft hangar roof of the project adopts a two-layer steel space frame structure, with a span of 216m(96m+120m) and a depth of 79m. The lower chord elevation of the space frame is 23 meters, the upper chord elevation is 29 meters, and the height is 6 meters. The section of the connecting rod of the space frame is a round tube, which is connected by welding hollow balls. The roof of the hangar gate adopts welded box door steel truss, the lower chord elevation of the truss is 20.5 meters, the upper chord elevation is 32.5 meters, the height of the truss is 12 meters, the truss is divided into the upper, middle and lower strings, and the belly rod is mostly H-shaped steel. The supporting system of the roof is the surrounding reinforced concrete columns (23 columns in total), which are spaced 9 or 18 meters apart. The space frame truss and concrete column are connected by fixed universal seismic ball hinge bearings. The total weight of the whole roof truss structure is about 2500 tons, including the crane beam, main purlin, and horse path.

The overall lifting of the prefab hangar project adopts the “hydraulic synchronous lifting technology” and adopts the core-piercing hydraulic hoist as the lifting machine and the flexible steel strand as the load-bearing rigging. It has the following advantages:

(1) Safe, reliable, light weight of bearing parts, convenient transportation, and installation, etc.;

(2) The main assembly, welding and painting work of steel space frame structure, auxiliary components and suspension structure is carried out on the ground, which can minimize the workload of aerial lifting, high construction efficiency, shorten the installation and construction period, and the construction quality is easy to ensure:

(3) The technology is mature, there is a large number of successful experiences of similar projects for reference, and the safety of the lifting process is fully guaranteed;

(4) Lift support, platform and other temporary facilities using existing structures such as concrete columns, coupled with the advantages of synchronous hydraulic lifting dynamic load is very small, so that the amount of temporary facilities to minimize, conducive to the control of construction cost.

Upgrade process:

(1) Ground leveling and hardening, temporary lifting support foundation construction;

(2) set embedded parts on concrete columns and temporary supports;

(3) Ground assembly network frame;

(4) Install the temporary support and platform for lifting, install the hydraulic synchronous lifting system equipment on the lifting platform, connect the hydraulic elevator and the lifting point structure with the special steel strand for hydraulic lifting, install the special ground anchor and pre-tensioning the steel strand:

(5) Equipment debugging of hydraulic synchronous lifting system;

(6) grading loading (trial lifting) until the steel space frame structure is completely off the ground (tire rack);

(7) Off-ground inspection:

(8) Formal promotion;

(9) The suspension in the air during the lifting process, the overall lift of the grid to a certain height, the installation of temporary support, the installation of the lower truss, the replacement of the truss hanging point;

(10) Lift the space frame to the top;

(11) Measurement control and fine tuning;

(12) the space frame is closed, and the roof steel space frame column top support and surrounding rods are installed;

(13) unloading, hydraulic synchronous lifting system equipment down operation, until the steel strand is completely relaxed, so that the roof steel space frame overall position to the concrete column;

(14) Removal of hydraulic synchronous lifting system equipment and other temporary lifting facilities;

(15) The overall installation of the roof steel space frame is completed.