The scaffold is easy to be disassembled and put up flexibly. Because the length of the steel tube is easy to adjust and the fastener is easy to connect, it can be adapted to various planes, facades of buildings and structures with scaffolding.
Scaffold bearing capacity is larger. When the geometrical dimension and the construction of the scaffold conform to the requirements of the specification, Scaffolding the bearing capacity of the single pipe column of the scaffold is usually very large.
Scaffolding is more economical. Processing is simple, the cost of one investment is lower; if the scaffold geometry is carefully designed and the working rate of the steel pipe is improved, Scaffolding the material dosage can also achieve better economic effect. The steel pipe frame of fastener is equivalent to 15 kg per square metre.
Different types of engineering construction use scaffolding and formwork support for different purposes. Scaffolding The bridge support frame uses the majority of the bowl buckle scaffold, also has the use gate type scaffold. The main structure of the construction of the scaffold using the fastener scaffolding, the scaffolding vertical bar is generally 1.2~1.8m; the transverse distance is generally 0 aged. 5m.
Scaffolding Compared with the general structure, the working conditions of scaffold have the following characteristics:
1, the load variability is large;
2, the Fastener connection node belongs to the semi-rigid, and the node rigidity size is related to the fastener quality, the installment quality, the node performance has the big variation;
3, the scaffold structure, the member has the initial flaw, such as the pole piece's initial bending, the corrosion, the erection size error, Scaffolding the load eccentricity and so on are big;
4, the connection point with the wall, the constraint variation of the scaffold is larger. The study of the above problems lacks the system accumulation and statistic data, does not have the condition of independent probability analysis, so the value of the adjustment coefficient of the structural resistance times less than 1 is determined by the safety factor of the previous use. Therefore, Scaffolding the design method adopted in this specification is in fact half probability and half experience. The construction requirement of scaffold to meet the requirements of this specification is the basic condition of design calculation.
Scaffold Construction Material request main points:
1) Choose Φ48.3x3 6mm steel pipe, steel pipe thickness should not be less than 3.24mm (there should be no serious corrosion, bending, flattening or crack); Scaffolding the old steel pipe surface corrosion depth should conform to the "Construction construction fastener-type steel pipe scaffold safety Technical Code" JGJ130-2011 provisions. Three root of corroded steel pipe is extracted, and the sampling inspection is cut crosswise at the worst part of each corrosion, Scaffolding and the rust depth exceeds the specified value. In addition to the entry of the steel pipe should also carry out a sampling retest, eligible to be used.
2 Fastener Warranty Information should be complete, Scaffolding after entering the scene should be sampling retest, technical performance should be in line with the "Steel Pipe scaffold fastener" GB15831 of the provisions of the use should be selected before, there are cracks, deformation, Scaffolding bolts appear sliding wire prohibited use.
3 The bamboo-foot hand made of Phyllostachys pubescens or bamboos is used.
4 The safety net uses the dense mesh green NET, the safety net flame-retardant standard executes the GB, and the safety net flame-retardant performance detection for the lighter to ignite the net piece 12 seconds, Scaffolding leaves the fire source, the flame-retardant, continues to burn does not surpass 4S. Safety NET application 9MM rope, rope, nylon rope woven, each net should be able to withstand the national standard 1.6KN Impact test.
5 The Cantilever scaffold uses the I20 number I-beam, the material should conform to the current national standard "carbon cable structural steel" gb/t700 or "low alloy high-strength Structural steel" GB/t 1591 stipulation.
6. The U-shaped steel bar pull ring of the fixed steel cantilever beam adopts 16mm round steel, Scaffolding the material should conform to the existing national standard "reinforced concrete steels part 1th: hot-rolled light round steel bar" GB 1499, 1 in HPB235 grade steel bar provisions.