沙朗特大桥钻孔桩基础钢筋笼制作及安装技术交底.doc
1、钢筋的存放
钢筋必须按照不同的等级、牌号、规格分批堆放,不得混杂,并且设立识别标志。钢筋在存放过程中,应避免锈蚀和污染,钢筋露天堆放时,应垫高并加覆盖。
2、钢筋笼制作前质量检验
(1)钢筋进场后,应做拉伸(抗拉强度、屈服点、伸长率)和冷弯试验。
(2)钢筋在加工之前,表面必须洁净、无油渍、漆污、水泥浆、铁锈等。
(3)钢筋应平直,无局部弯曲。
(4)加工后的钢筋,表面不应有削弱钢筋截面的伤痕。
(5)成盘的钢筋和弯曲的钢筋必须调直。用冷拉法矫直钢筋时,I级钢筋的冷拉率不大于2%,II级钢筋的冷拉率不大于1%。
3、钢筋笼制作要求
(1)钢筋焊接前,必须首先做钢筋焊接试验,合格后方可正式施焊,焊工必须持证上岗施工。
(2)设置钢筋笼加工制作的工作平台,加工场地和制作平台必须平整。制作一圆形的加强筋作业盘,统一制作钢筋笼的加强箍筋,保证钢筋笼圆形一致。
(3)钢筋笼根据设计长度分节制作安装,根据钢筋
1, steel storage
Steel must be in accordance with the different grades, grades, specifications stacked in groups, not mixed, and the establishment of identification. Reinforced during storage, corrosion and pollution should be avoided, bar open pile should be padded and increase coverage.
2, pre-production quality inspection reinforcement cage
(1) reinforcement approach, it should do stretching (tensile strength, yield point, elongation) and the cold test.
(2) before the steel in the process, the surface must be clean, no grease, paint, dirt and water, mud, rust, etc..
(3) bar should be straight, no local bending.
(4) processed steel, the surface should not weaken the steel cross-section scars.
(5) into a plate of steel and bending the steel to be straightened. Rafah with cold steel when straightening, I cold-drawn steel bar rate level is not more than 2%, II grade cold drawn steel bar rate of less than 1%.
3, steel cage production requirements
(1) steel before welding, steel welding test must be done first, before they come after passing the weld, welders must hold relevant certificates construction.
(2) manufacture of reinforced cage work platforms, processing facilities and production platforms must be formed. Production of a circular plate stiffener operations, the strengthening of unity of stirrup reinforcement cage made to ensure the consistent reinforcement cage round.
(3) the length of reinforcement cage section according to the design manufacture and installation, according to steel
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