Grid Steel Structure Net Work Frame Steel Structure Engineering

• Connection Form: Welded Connection
• Type: Light Section Steel
• Standard: GB, ASTM
• Trademark: Carbon Structural Steel, XHZT
• Forming: Forging Steel
• Member: Steeltruss
• Model NO.: xhst
• Type of Steel For Building Structure: High-Strength Steel
• Carbon Structural Steel: Q235
• Residential Wall Structure: Wall Support
• Application: Steel Workshop, Steel Structure Platform, Steel Fabricated House, Structural Roofing, Frame Part, Steel Walkway and Floor, Steel Structure Bridge
• After-sales Service: Offer Egineer
• Warranty: 1
• Transport Package: No
• Specification: XHST
• Origin: China
• HS Code: 7308900000
• Production Capacity: 20sets/Month

Product Description

Grid steel structure
product presentation

The network frame/Grid steel structure
 is a spatial structure formed by a number of rods connected by nodes according to a certain grid form. The basic units of the grid frame have trigonal cones, triskeles, cubes, truncated quadrangles, etc., from which the basic units can be combined into a plane shape of trilateral, quadrilateral, hexagonal, circular or any other shape. It has the advantages of space force, light weight, high stiffness, good seismic performance, etc. It can be used as the roof of the stadium, theater, exhibition hall, waiting hall, stadium stand awning, hangar, two-way large column grid structure from the workshop and other buildings. The disadvantage is that the number of rods delivered to the node is large, and the production and installation are more complicated than the plane structure
It can be divided into double-layer plate grid structure, single-layer shell grid structure and double-layer shell grid structure. The bar parts of the plate type grid frame and the double shell type grid frame are divided into the upper chord rod, the lower chord rod and the belly rod, which mainly bear the tension and pressure; In addition to tensile force and pressure, the bar of the single shell frame also bears bending moment and shear force. At present, most of the grid structure in China adopts plate type grid structure.
It can be divided into three types: the first type is composed of plane truss system, which has four forms: two orthogonal vertical grid, two orthogonal oblique grid, two oblique oblique grid and three vertical grid. The second type is composed of four pyramidal units, which have five forms: normal quadrangle grid, normal evacuation quadrangle grid, oblique quadrangle grid, checkerboard quadrangle grid and star quadrangle grid. The third type is composed of triangular pyramidal elements, and has three forms of triangular pyramidal mesh, evacuated triangular pyramidal mesh and honeycomb triangular pyramidal mesh. Shell mesh structure is divided into cylindrical shell mesh, spherical shell mesh and hyperbolic parabolic shell mesh. The grid structure is divided into steel grid, reinforced concrete grid and composite grid composed of steel and reinforced concrete according to the materials used, of which steel grid is used more.


product feature
 The bar section of the grid structure should be determined according to the strength and stability calculation. In order to reduce the calculating length of the pressure rod and increase its stability, measures such as adding a re-dividing rod and a supporting rod can be adopted. The joints of plate type grid and double shell grid made of steel mainly have three forms: cross plate joints, welded hollow ball joints and bolted ball joints. The cross plate joint is suitable for the grid structure of the shaped steel bar. The connection between the bar and the node plate is welded or connected by high strength bolts. Hollow ball joint and bolt ball joint are suitable for the steel pipe rod grid structure. The nodes of the single-layer shell grid should be able to withstand bending internal forces, and under normal circumstances, the steel consumption of the nodes accounts for 15 to 20% of the steel used in the entire steel grid structure.
The grid structure is a higher order statically indeterminate structure system. In the analysis of plate-type grid, it is generally assumed that the joints are hinged, and the external load is applied to the joints according to the principle of static equivalent, which can be calculated according to the displacement method of space truss, that is, the finite element method of hinged rod system. The internal force and displacement can also be calculated by simplified calculation methods, such as cross beam system difference analysis and pseudo-plate method. The joints of single-layer shell grid are generally assumed to be rigid-connected and should be calculated according to the finite element method of rigid-connected rod system. The double shell frame can be calculated by the hinged rod system finite element method. The simulation shell method can also be used to simplify the calculation of single and double shell type grids.


construction site
The construction and installation methods of the grid structure are divided into two categories: one is the integral lifting method, the integral lifting method and the integral lifting method assembled on the ground; The other is the method of high-altitude bulk, strip and block assembly and high-altitude slip assembly.


There are many types of grid structure, which can be classified according to different standards.
First, according to the structure of the grid itself can be divided into: single-layer grid structure, double-layer grid structure; Three layers of grid. Among them, single-layer grid and three-layer grid are suitable for a small span (not more than 30m) and a particularly large span (more than 100m), and there are few engineering applications in China.
Second, according to the construction material is divided into: steel mesh, aluminum mesh, wood mesh, plastic mesh, reinforced concrete mesh and composite mesh (such as steel mesh and reinforced concrete slab composite mesh, etc.), which steel mesh has been widely used in China, composite mesh can also be used as floor structure.
Third, according to the support can be divided into: peripheral support, four-point support, multi-point support, three-sided support, opposite side support and mixed support form.
Fourth, according to the different composition, the grid can be divided into four categories:
1, cross truss system grid;
2, pyramidal system grid;
3, quadrangular system grid;
4. Hexagonal pyramidal system grid.
Among them, the fourth classification method is a more popular one in China.

Rod design and joint construction
The bar section of the grid structure should be determined according to the strength and stability calculation. In order to reduce the calculating length of the pressure rod and increase its stability, measures such as adding a re-dividing rod and a supporting rod can be adopted. The joints of plate type grid and double shell grid made of steel mainly have three forms: cross plate joints, welded hollow ball joints and bolted ball joints. The cross plate joint is suitable for the grid structure of the shaped steel bar. The connection between the bar and the point plate of the grid structure is connected by welding or high-strength bolt. Hollow ball joint and bolt ball joint are suitable for the steel pipe rod grid structure. The nodes of the single-layer shell grid should be able to withstand bending internal forces, and under normal circumstances, the steel consumption of the nodes accounts for 15 to 20% of the steel used in the entire steel grid structure.