箱涵钢筋施工技术交底.doc

交底内容：
1.  1. 本箱涵（K9+535.284）所用的钢筋材料：全部钢筋为II级钢筋。
2.  2. 钢筋加工：
3.  （1） 进场钢筋必须有质保书或试验报告单，钢筋进场时分批抽样做物理力学试验。
4.  （2） 钢筋加工的形状、尺寸必须符合设计要求。钢筋的表面确保洁净，无损伤，油渍、漆污和铁锈等在使用前清除干净。不使用带有颗粒状或片状老锈的钢筋。
5.  （3） 钢筋必须平直，无局部曲折。调直钢筋时按下列规定执行：
6.       A.  采用冷拉方法调直钢筋时，II级钢筋的冷拉率不宜大于l%。
7.       B.  冷拨低碳钢丝在调直机上调直后，其表面不得有明显擦伤，抗拉强度不得低于设计要求。
8.  （4）Ⅱ级钢筋末端需作90o或135o弯折时，Ⅱ级钢筋的弯曲直径D不小于钢筋直径d的4倍，平直部分长度按设计要求确定。
3. 钢筋焊接：
（1） 钢筋焊接使用焊条、焊剂的牌号、性能以及接头中使用的钢板和型钢必须符合设计要求和有关规定。
（2） 钢筋焊接前，必须根据施工条件进行试焊，合格后方可施焊。焊工必须有焊工考试合格证，并在规定的范围内进行焊接操作。
（3） 焊接成型时，焊接处应无水锈、油渍等，焊接后
Cards on the table contents:
1.1. The box culvert (K9 +535.284) materials used in steel: All steel reinforcement for the II level.
2.2. Steel processing:
3. (1) must have a quality assurance approach reinforced the book or test report sheet, reinforced sample batches to do when approaching the physical and mechanical tests.
4. (2) steel processing, shape, size must meet the design requirements. Steel surface to ensure clean, no damage, oil, paint, rust, pollution and cleaned before use. Do not use with granular or flaky old rust steel.
5. (3) bar must be straight, no local complications. Straightening iron bar, according to the following provisions:
6. A. Method of using cold-straightening iron bar, II grade cold drawn steel bar rate should be less than l%.
7. B. Cold low carbon steel wire dial up straight in the straightening machine, the surface may not have significant abrasion, tensile strength of not less than the design requirements.
8. (4) Ⅱ grade steel end of the need for bending when 90o or 135o, Ⅱ grade steel curved bar diameter D is not less than 4 times the diameter d, flat part of the design requirements determined by the length.
3. Steel welding:
(1) The use of steel welding electrodes, flux of grades, performance, and joints used in steel and steel must meet the design requirements and relevant regulations.
(2) steel welding prior to the test conditions according to the construction welding, welding facilities until they have passed. Welders must have a welder certification, and within the provisions of welding operation.
(3) welding molding, welding rust should be water, oil, etc., welding