space frame in constructions

Construction of galvanized steel space truss. Steel Structure Engineering Construction Galvanized Steel Space Truss

Construction of galvanized steel space truss. Explanation of technical details for steel structures for construction of galvanized steel space truss. Design bar and coupling steel ball button and bolt. The construction technique of wire mesh-shaped galvanized steel space frame. One of the space truss models is prevailing today. Roof space frame steel - span for the stadium normally used space frame steel hot-dip galvanized or space frame steel oil painting. Form design space frame constructed of galvanized steel is being appreciated and used extensively in the industrial structure, the stadium ...

1. Designing and constructing space of galvanized steel ball button structure bar

a. Galvanized steel space truss structure bar can use conventional section steel and thin-walled section steel. Steel pipe should be high frequency welded pipe or seamless cast steel pipe. Galvanized steel space truss construction should be constructed using thin-walled pipe sections where possible to reduce load. The steel of the space truss bars must be approved according to current national standards. Steel structure design standard "TK50017. Construction of galvanized steel space truss with bar cross-section should be calculated and determined according to current national standards. Steel structure design standard includes requirements. demand for strength and stability.

b. When determining the slender ratio of the bars, the calculated length must be approved according to the space frame construction of galvanized steel.

c. The thinness ratio of the bars should not exceed the value specified in the construction bladder of the galvanized steel space frame.

d. The minimum cross-section size should be determined by calculating the span of the structure and the space frame size. Regular cross-section steel must not be less than L50 × 3 and pipe steel not less than Φ48x3.

e. The bridge node structure distribution in galvanized steel space rig construction design ensures continuity of hardness, and the cross-section difference of continuous bars should not exceed 20%. The difference in section specification should not be more than 2 levels, and the upper and lower chord of the inverted point of the multi-point supporting iron ball-button structure should increase the cross-section according to the structure.

f. For low-stress bars and small specifications, the bar slenderness ratio should be controlled according to the bars.

g. In the structural design of the bar, officers avoid dead corners or dents that are difficult to inspect, clean, paint, and retain moisture.

2. Galvanized steel space frame construction design, steel ball structure button bolts

1. Weld the hollow ball button in the galvanized steel space rig construction.

a) Has two hemispherical spheres, which can be used without assistance in the construction of the galvanized steel space truss, and with the support, depending on the magnitude of the force, suitable for joining members steel pipe truss bars.

The steel of the hollow sphere for the production of galvanized steel space truss construction should use Q25B steel specified in national standards. Carbon jamming structural steel or Q345 steel is specified in the space truss standard Low alloy high strength structural steel. current "Welded wire mesh spherical joint".

b) To reliably transmit the force of the bar and to allow the hollow spheres to be efficiently connected to the round steel tube bars, for the hollow spheres during machining and construction of the galvanized steel space truss Welded must meet the following structural requirements:

The ratio of the outer diameter to the wall thickness of the construction of the galvanized steel space truss and the hollow sphere with double-meshed mesh should be 25-45. The ratio of the outer diameter to the wall thickness of a hollow sphere with a single insulating mesh should be 20-35; outside diameter of the hollow sphere. The diameter to outside diameter ratio of the main steel pipe should be 2.4 ~ 3.0. The ratio of the wall thickness of the hollow sphere to the wall thickness of the main steel pipe should be 1.5 ~ 2.0. The hollow spherical formation should not be less than 4mm.

The structure of the calculated load of steel must be higher than the capacity of the components and truss bars.

Welding and construction of galvanized steel space truss. Butt welding of ribbed hollow spheres and ribbed hollow balls shall meet the respective requirements for galvanized steel space truss construction. The rib of the hollow ball assist can be used as a pedestal or a boss. When covered, the height must not exceed 1mm. The steel tube bar is connected to the hollow ball, and the steel pipe must be grooved.

A certain distance should be left between the steel pipe and the hollow and penetrated ball to achieve the strength of the weld and the steel pipe. Otherwise, galvanized steel space rig construction should be calculated as a fillet weld. In order to ensure the quality of the weld line, the steel pipe end can be welded to the tube and the hollow ball. The wall thickness of the wall pipe is not less than 3mm and the length of the fillet weld is not less than 4m The foot size hf of the fillet weld must meet the following requirements: when the wall thickness of steel pipe tf≤4m, hf ≤ 1.5tf; when tf> 4m, hf≤1,2tf.

c) When determining the outer diameter of the hollow sphere, the actual distance between adjacent bars on the surface of the galvanized steel space truss construction must not be less than 10m.

d) When the diameter of the hollow ball is too large and there are too many rods, to reduce the diameter of the ball joint, part of the welding rod and the truss bars are allowed to intersect, but the following structural requirements must be met:

The axis of all converging members must go through the centerline of the ball;

a) In two converging rods, the bar with a large cross-section shall be welded entirely to the ball. When the cross-sectional area of ​​the two bars is equal, the tension is taken, and the groove of the other bar must be welded to the intersecting web bar. However, when constructing the galvanized steel space rig, make sure that 3/4 of the section is welded to the ball and reinforced with stiffened ribs.

 b) For large bearing bars, stiffening ribs can be installed, or support plates can be installed.

Note the construction of galvanized steel space truss. When the outer diameter of the hollow ball is not less than 300mm and the static load of the bar is large, the stiffening ribs can be placed in the shaft plane of the bar with greater internal force to improve the bearing capacity of the bar; when the outside diameter of the hollow ball is not less than 400mm, and when the bar with greater internal force is under pressure, the stiffening ribs can be arranged in the shaft plane of the rod with greater internal force.

When the outer diameter of the empty sphere is not less than 500mm, the stiffening ribs shall be placed in the axial plane of the bar with the higher pressure. The thickness of the cargo line when installing the galvanized steel space truss is not less than the thickness of the sphere wall.

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