Prefab Steel Workshop Buildings
prefab steel steel workshop buildings,modular workshop also named as prefab workshop , it mostly made of steel using the steel column ,beam ,purlin, steel panel , and other support systems . Usually we design the prefab workshop one span at most 30m , it is most enconomic dessign.
Steel structure engineering project is the steel structure, mainly made of steel and steel beam, steel column, steel truss and other artifacts, weld is required between each components or parts, bolt, or rivet connection, is one of the main building structure types. Because of its weight is lighter, and the construction is simple, widely used in large factory buildings, Bridges, stadiums, high-rise, etc.
China testing standard:
1. Steel frame structure
（1） steel bar slenderness ratio of the detection and calculation, according to the provisions of section 6.4 of this chapter to determine bar size, should calculate bar with actual size of slenderness ratio.
（2）steel structure supporting system connection, according to the provisions of section 6.3 of this chapter detection; The size of the support system component, can determine the provisions of section 6.4 of this chapter; Should according to the design drawings or relevant design code for verification or evaluation.
Generous than 1.3 section steel structure components, according to the provisions of section 6.4 of this chapter to determine component section size, and conduct business accounting, should according to the design drawings and related specifications were assessed.
（1） the quality of the protective coating of steel structure, should according to the current national relevant regulations of the product standard for coating quality.
（2） steel surface descaling grade, available to the current national standard "steel surface before coating corrosion level and descaling grade GB8923 image contrast observation to determine.
（3）different types of paint coating thickness, should adopt the following methods:
①. film thickness, film thickness gauge testing are available, and the number of sampling observation components should not be less than the standard of class A test sample in table 3.3.13 minimum capacity, also should not be less than 3 pieces;5 each test, the value of each of three point dry film thickness of 50 mm apart the average.
②. fire retardant coating for thin film thickness, coating thickness tester can be used to detect and measure method shall comply with the technical specification for steel structure fire retardant coating CECS24 rules.
③. type of thick fireproofing coating thickness, needle and steel rule should be adopted for the detection, measurement methods should be consistent with the technical specification for steel structure fire retardant coating CECS24 rules. Coating thickness values and deviation values should be in accordance with the "construction quality acceptance of steel structure engineering GB50205 rules were assessed.6.7.4 coating appearance quality, according to different materials according to the construction quality acceptance of steel structure engineering GB50205 rules for testing and evaluation.
3. Steel grids
（1）steel space frame detection can be divided into the bearing capacity of the node of bar, weld, size and deviation, not straightness and the deflection of steel rack and so on.
（2）steel space frame welding and bolt ball ball node of the bearing capacity of inspection, should according to the engineering quality inspection evaluation standard of the spatial grid structure JGJ78 requirements.For existing bolt ball node network frame, can be removed in the structure of the ultimate bearing capacity of the node to node.In the interception of bolt ball nodes, the measures should be taken to ensure the structure safety.
（3） welds in the steel space frame, can adopt the method of ultrasonic flaw detection test, test operation and evaluation should be according to the welding of steel ball node network frame of weld ultrasonic testing and quality classification act JG/T3034.1 or the bolt ball node of steel space frame weld ultrasonic testing and quality classification method of "JG/T3034.2 requirements.
（4） the appearance of weld quality in the steel space frame, should be in accordance with the "construction quality acceptance of steel structure engineering GB50205 requirements for testing.
（5）welding ball, bolt, high strength bolt and bar deviation detection, detection method and the deviation value should be according to the engineering quality inspection evaluation standard of the spatial grid structure JGJ78 provisions.
（6）steel rack of bar steel pipe wall thickness, can use ultrasonic thickness gauge testing, act the role of the surface shall be removed before testing.
（7）steel bar in the rack of axis straightness, pull methods are available, and its not straightness shall not be less than one over one thousand of the length of the bar.
（8） the deflection of steel space frame, can use laser range finder or level detection, every half across a range of private points should not be less than three, and have a point across, the end point of end bearing should not be greater than 1 m.