space frame in constructions

Construction of large span steel space truss for gymnasium, stadium, factory

Space frame structures examples. Construction of steel space truss. Structural design and construction of steel space truss , structural steel structure prestressed large span steel space truss for gymnasium , stadium, factory system, or tram station system. The prestressed steel structure is a new star in industrial and civil steel space frame construction. In recent years, post-tensioned steel structures have sprung up all over the world and are widely used at home and abroad.

Steel space truss construction characteristics . The space frame structures examples. Starting from the analysis of the characteristics of prestressed steel structure, which TINTA record entries this classification systems steel structure space truss in Prestressed, and on this basis. Discuss some issues in the design and construction of steel space truss prestressed steel structure nodes of different types of structures. Finally, combined with personal experience, proposals are made for the development of the prestressed steel structure.

Main feature of large span steel structure for post-tensioning projects

The main feature of the construction of the pre-stressed steel structural steel space truss is to take advantage of the steel's elastic potential, thereby increasing the bearing capacity of the structure, improving the stress state of the structure, saving steel. Compared to traditional pre stressed steel structures, modern innovative structural steel space truss construction systems (such as cable arches and cable membrane structures, etc.) perform better in terms of material savings .

Due to the large amount of post-tensioning, bending and compression are eliminated. The truss bars, together with the application of the steel space frames and truss construction gantry structure and the roof are light and durable (such as profiles steel plates and composite film materials, etc.). The system consisting of a bearing structure becomes very light and the self-weight of the structure is doubled or reduced several times. On the other hand, the construction of the prestressed steel space frame can improve the rigidity and stability of the structure and adjust its dynamic performance.

Design and construction of steel space frame prestressed steel structure button

Steel space rig construction design with joints is an important link in the design of prestressed steel structures, and it is also the key to its structural functions. The stiffness of the button is the factor affecting the deterioration of the structure, whether the button can be rotated, adjustable, ...

It affects the overall hardness of the structure and construction of the steel space truss with the distribution of prestressing grades, and the geometry. of the structure, whether the structure can be successfully completed in the state of formation, etc. The important factor in aspect.

Design of the ball-head button, bolt, sleeve, and truss of the prestressed insulated shell structure

For common joints in the construction of dome steel space truss with pre-stressed insulation, when the bar is round tube, the hinge joint is usually a screwed spherical joint, and the hardware joint. the large is the welded hollow spherical joint; when a cross-section steel bar is used, plate joints may be used.

Fabrication of steel space rig construction details . A pre-stressed joint is a specially made joint with welded hollow spheres. The support node must adapt to the application of the prestressing and meet the assumptions of the calculation scheme. For extremely large span pre-stressed insulating sheath structures, the following joints are mainly introduced and discussed in conjunction with their properties.

1) Iron ball bolt with bolt: Iron ball bolt joint has clear force, easy installation, the structure is not too complicated and can be widely used in mass production for steel space rig construction easy big beat .

2) Prestressed joint: is the anchor connection for the prestressed high-tensile steel cable, the most important part of the pre-stressed insulation.

3) Flanged drum plugs: According to the space truss and conventional steel space frames in construction design , the nodes of giant structural systems must be "extremely large" and "super large", and very difficult to install at high altitudes. However, flanged drum joints not only have the advantage of low consumption, lightweight, and easy expansion to weld hollow ball joints but also has the feature of a screwball joint that does not require welding in place, quality. high. and quick installation, and change the original bar and joint to a single bolt. The connection is allocated, avoiding the problem of new oversized bolts developing.

4) Rubber-bearing button: The rubber ball bearing not only has a high bearing capacity, simple structure, and good shock resistance performance but also can adapt to the expansion and rotation of multidirectional construction steel dome mesh space truss.

Design of the bolt link bridge in the construction of the steel space truss of the suspended structure

The iron ball nodes of the steel space truss construction structure are divided into the upper node of the cable and the lower node of the cable. According to the different types of cable anchors used, the regular type anchors are used for cold cast anchors, and the lug plate connection is often used for hot cast anchors. Because the top node often has many crossed cables, the structure is complex and has a large force, so it is often used cast steel buttons, while the lower button is a cast steel button or the button of the lugs depending on the complexity of the steel structure at the node and space frame structures examples.

The main nodes of the beam chain structure include: 1) support nodes; 2) bracing buttons and lower chord cable buttons; 3) bracing button and upper chord member button. The structure of the above three types of nodes is described below in combination with construction projects of large span steel space truss.

Design of bridge joints and bolts of chain beam steel space truss construction structure

1) Bearing plug: In order to ensure self-balancing of the prestress of the structure and construction of the steel space truss, partial release of temperature stress, the hinge support at both ends of the girder chain structure is usually designed as a tubular support beam with a fixed end and a horizontal slide. Usually the supports at both ends of the wire beam are supported on the surrounding structures, but for horizontal anti-slip columns it is also done by setting up a herringbone swivel column.

2) Connection between the strut and the lower roof cable when constructing the steel space truss : between the strut and the lower chord cable. The node structure must be designed according to the calculation and analysis diagram. For beam structures with only longitudinal struts, the lower bracing must be fixed between tension joints and the strut bar. Therefore, the knot-construction must ensure that the cables are fastened and cannot be slipped.

3) Strut and button member of the strut out: beyond the plane of the chord sound rigs under No rack up the middle button struts and structures of chords on often designed construction space frame steel is Button structures can rotate in the plane and restrict outward rotation.

See the next section on steel space rig construction.

See part 1: about  steel space frame construction .

See part 2: Construction of large span steel space truss .

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