日本欧美一区二区三区不卡视频_亚洲欧美日韩中文字幕一区二区_日韩免费视频一区二区_欧美黑人粗大猛烈18p

Guangzhou Steel tells you: construction steel materials site acceptance requirements Steel use steel, welding materials, coating materials and fasteners should have quality certificate, must meet the design requirements and existing standards. Raw m...

Guangzhou Steel tells you: assess Steel Works Welding Technology 1, the construction unit for the first time use of steel, welding materials, welding, joint type, welding position, post-weld heat treatment, a combination of various parameters and pa...

Guangzhou Steel teach you: General Provisions splicing steel engineering components 1, H-beam flange plate welded seam and web seam pitch, not less than 200mm flange plate splice length not less than 600mm;. Web splice width of not less than 300mm, ...

Guangzhou Steel teach you: construction steel components assembled provision   Assembly platform, mold, etc. should be smooth and firm, in order to ensure the accuracy of the assembly member.Necessary reference to the drawings, processes and q...

Guangzhou Steel tells you: steel blasting and painting method request Steel rust coating method and requests?[Guangzhou Steel answer] 1, rust grades should be based on the original state of the steel surface, the choice of primer, rust method used a...

Guangzhou Steel teach you: Overview of light steel structure Lightweight steel is mainly used in non-load-bearing construction to withstand large loads. Combined with Light H beam (welded or rolled; variable cross-section or the like) to make the ga...

Guangzhou Steel teach you: Steel Construction Safety Control handle Exploration With the development of society, the steel works from an economic, practical, seismic, may increasingly being recognized in the use and so on, along with the increase in...

Guangzhou Steel says: "The construction quality inspection norms steel works' quality requirements and inspection provisions (1) Guangzhou Steel Steel: The steel is one of the following conditions should be carried out sampling re-examination, re-ex...

Guangzhou Steel teach you: the coupling of steel Guangzhou Steel's steel connection: connection welds, rivets, screwed. According to the degree of automation of welding technology it is usually divided into welding, semiautomatic and automatic weldi...

Guangzhou Steel remind you: Fire principle of fireproof coatings and problems Steel as the main form of modern architecture, at room temperature with a light weight, high strength, good seismic features, short construction period, building high degr...

Guangzhou Steel tells you: the technical requirements of tall steel structure of the device which (1) Preparation: include preflight and supporting steel members, positioning axes and elevation view and anchor bolts, steel components on-site stacked...

Guangzhou Steel teach you: Preparation before the installation of steel color plate 1, primary and secondary component inspection system is Homogeneous Steel, Steel correction is completed.2. Check all bolts connecting surface groove is broken or ti...