箱涵鋼筋施工技術交底.doc

交底內容：
1.  1. 本箱涵（K9+535.284）所用的鋼筋材料：全部鋼筋為II級鋼筋。
2.  2. 鋼筋加工：
3.  （1） 進場鋼筋必須有質保書或試驗報告單，鋼筋進場時分批抽樣做物理力學試驗。
4.  （2） 鋼筋加工的形狀、尺寸必須符合設計要求。鋼筋的表面確保潔凈，無損傷，油漬、漆污和鐵銹等在使用前清除干凈。不使用帶有顆粒狀或片狀老銹的鋼筋。
5.  （3） 鋼筋必須平直，無局部曲折。調直鋼筋時按下列規定執行：
6.       A.  采用冷拉方法調直鋼筋時，II級鋼筋的冷拉率不宜大于l%。
7.       B.  冷撥低碳鋼絲在調直機上調直后，其表面不得有明顯擦傷，抗拉強度不得低于設計要求。
8.  （4）Ⅱ級鋼筋末端需作90o或135o彎折時，Ⅱ級鋼筋的彎曲直徑D不小于鋼筋直徑d的4倍，平直部分長度按設計要求確定。
3. 鋼筋焊接：
（1） 鋼筋焊接使用焊條、焊劑的牌號、性能以及接頭中使用的鋼板和型鋼必須符合設計要求和有關規定。
（2） 鋼筋焊接前，必須根據施工條件進行試焊，合格后方可施焊。焊工必須有焊工考試合格證，并在規定的范圍內進行焊接操作。
（3） 焊接成型時，焊接處應無水銹、油漬等，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
 

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