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Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2
Guiyang Longdongbao Airport Terminal 2

Guiyang Longdongbao Airport Terminal 2

Guiyang Longdongbao Airport Terminal 2

The Guiyang Longdongbao International Airport Terminal project is a key project of the country’s western development, with a total construction area of 110,000 ㎡.
(1) The steel structure airport includes the main terminal building in Area B, the corridor in Area C, the corridor in Area D and the corridor in Area E.
(2) The main structure of the first underground floor and the first floor above ground is a cast-in-place concrete frame structure.
(3) The main structure of the main airport terminal building in Area B on the 2nd floor above ground is a steel structure quadtree-shaped column and a large-span curved space frame roof structure on top of the Y-shaped column;
(4) The main structure of the corridors in C, D, and E areas is a roof structure with a square pyramid double-layer plane space frame placed on top of conventional steel structure columns.(5)The space-frame roof of the terminal building adopts a high-altitude bulk method combining sliding scaffolding and partial full-room scaffolding.

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Standard: GB Grade: Steel
Application: steel structure airport Type: Light steel
Processing Service: Bending, Welding, Decoiling, Cutting, Punching Tolerance: 10%
Paint Color: Light Grey Installation: Supervision
Finishing Treatment: Hot-dip Galvanization or Paint Connection Type: Bolt Ball Connection
Steel Material: Q235, or Q355 Design life:   50 year

The steel roof truss of the Guiyang Longdongbao International Airport T2 terminal is a large span curved space truss structure with complex quadtree shaped columns in the middle and Y shaped columns on both sides, the top of the column is connected by anti-seismic radial joint bearing. The structure is complex, the technical requirement is high, and the construction is difficult. According to the engineering structure characteristics and site conditions, the space frame roof adopts a high-altitude bulk loading scheme which combines sliding scaffolding and local full-hall truss.

Unique space truss stress system in area B

(1) the plane projection size of the roof structure of Terminal B is 255m × 147.6m.

(2) large-span curved space frame is adopted, the space frame size is 4m × 4m and the space frame thickness is about 3.2 m.

(3) in order to meet the requirements of energy-saving, natural lighting and aesthetic appearance, 15 shuttle-shaped skylights are formed by hollowing out some of the rods at the crest of the wave in the span direction of the roof (see Fig. 1) . Each skylight is provided with 3 pieces of inverted triangle roof truss which is rigidly connected with the original space truss roof in order to enhance the overall mechanical performance and out-of-plane stability of the 15 individually formed slender space truss, forming a unique space truss stress system.

(4) the maximum span of the whole space truss is 32.7 m, and the maximum span of the hollowed part of the space truss is 93 m.

Force system of space truss

Fig. 1 Steel Structure in area B

Complex roof support system

(1) in the middle of the main terminal building of Area B, there are 16 quadrilateral tree-shaped columns, the distance between the middle columns is 45m, and the distance between the left and right columns is 30m.

(2) vertical steel tubular column (1300×60) in lower section and shuttle steel tubular column (900x 25 ~ 300x 25) in upper section.

(3) there are 28 y-shaped columns on the east and west sides, the distance between the columns is 15m.

(4) the lower segment of the y-shaped column is a vertical steel pipe column (750×25) and the upper segment is a branch steel pipe column (600×25) .

(5) the bottom of the y-shaped column is provided with a basin-type support. Quad tree-shaped columns and Y-shaped column tops are connected to the joints by aseismic radial joint bearings  .

(6) the east side middle and the north-south two ends adopt the concrete structure column, the column top is the rubber bearing.

Installation idea

 

Taking into account the structural stress characteristics of the project, the actual conditions of the construction site, and the requirements of the total construction period, the construction scheme of the steel structure project is determined.

1) the Y-shaped column is assembled on the ground and lifted by a 50t truck crane. Because of the particularity of the site, the steel casting of the middle quadtree-shaped column joint and the shuttle-shaped column of the upper section (diagonal bracing) are assembled in bulk at high altitude by setting up a temporary bracing frame. When the quadtree-shaped column is installed, the Crawler crane can only walk on the west side of the structure of Area B, so the hoisting machine adopts a 350T Crawler crane.

2) the space frame structure adopts the construction scheme of sliding scaffold and partial shelter position, full-space scaffold combined with high-altitude bulk assembling. The sliding scaffold is set up according to 2 spans, one span is used for assembling, welding, and one span is used for painting operation. For each unit assembled, the sliding scaffold moves forward one span to begin the new unit assembly. 3) the installation of steel pipe column and  space frame structure in Zone B is symmetrical from the middle to the two sides, and the construction of Part B 1 needs to be finished because of the influence of the construction period of the viaduct. To ensure the mechanical performance of the structure, according to the computer simulation analysis, the temporary support frame of the quadtree-shaped column can not be removed until the top  space frame structure of the previous quadtree-shaped column is installed, and the temporary support frame of the quadtree-shaped column ZC1 can not be removed until the corresponding position structure of the B1 part is installed.

high-altitude bulk

4) a 100 t Crawler crane is responsible for lifting the material from the ground to the 8.000 m high floor, and four 12 t truck cranes are installed on the space frame at the 8.000 m high floor.

 

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