Path of steel prices rebound at the end of last month's immediate death, start the steel from the raw material market shelf obviously does not have continuity; May Day after frame tube, steel price originally want to borrow continued upside apparently failed to achieve the purpose of the study, in the downstream demand is not willing to support the case, return to weak shock interval, the market steady dark drop shipping operation more and more.

Even under the led of the iron ore price elasticity, black metal futures continued to pull up, but failed to drive the spot market sentiment; The weakness of the economy, downstream demand sheepishly, makes the steel price rise to rise.

(1) to heavy scaffold should have a clear understanding, generally if the thickness of the floor more than 300 mm, should consider the design according to the heavy scaffolding, scaffolding tube load more than 15 kn/was, should organize expert argumentation.

To separate the parts of the steel tube length changes on bearing, for the upper free length should be considered a form scaffolding should not be too long, generally less than 500 mm advisable (in the new specifications may be revised), poling calculation generally on the top step and the largest stress at the bottom step, should be regarded as the main computing point. When required by the bearing capacity of discontent group should add stud reduce interval.

(2) the present domestic scaffolding tube common materials such as steel, fasteners, jacking and tap to be of poor quality, in the actual construction failed to consider the theoretical calculation. The construction of the lever is missing, not connected, sweeping stem from two vertical and horizontal distance is too big or too small, etc.;