綜合管溝鋼筋工程施工技術交底.doc

交底內容：
1.  1. 本工程所用的鋼筋材料：d≤8為I級鋼筋（HPB235）， d≥10為II級鋼筋（HRB335）。
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，I級鋼筋的冷拉率不宜大于4%；II級鋼筋的冷拉率不宜大于l%。
7.       B.  冷拔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） 鋼筋的彎鉤或彎折按下列規定執行：
9.       A.  I級鋼筋末端需要作180o彎鉤，其圓弧彎曲直徑D不小于鋼筋直徑d的2.5倍，平直部分長度不小于鋼筋直徑d的3倍。
10.       B.  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。
11.       C. 箍筋的末端作成彎鉤，彎鉤形式按設計要求。
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，本工程設計要求為： I級鋼筋采用T42型焊條，Ⅱ級鋼筋采用T50型焊條。
（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，焊接后在焊接處無缺口、裂紋及較大的金屬焊瘤，用小錘敲擊時，應發出與鋼筋同樣的清脆聲。鋼筋端部的扭曲、彎折必須校直或切除。
（4） 軸心受拉和小偏心受拉桿件中的鋼筋接頭均采用焊接。普通混凝土
Cards on the table contents:
1.1. The steel used in construction materials: d ≤ 8 for the I grade steel (HPB235), d ≥ 10 for the Grade II steel (HRB335).
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 the old rust with a granular or flake reinforced.
5. (3) bar must be straight, no local complications. Straightening iron bar, according to the following provisions:
6. A. Method of using cold-drawn steel straighten when, I reinforced the cold-drawing class rate of not more than 4%; II grade cold drawn steel bar rate should be less than l%.
7. B. cold drawn low carbon steel wire straight up in the straightening machine, the surface may not have significant abrasion, tensile strength of not less than the design requirements.
8. (4) reinforcement of the hook or bent according to the following provisions:
9. A. I need to make 180o Grade Reinforced end hook, the arc bending diameter D is not less than 2.5 times the bar diameter d, the length of straight part of the bar diameter d is not less than 3 times.
10. B. Ⅱ grade steel needed for the end of 90o or 135o when bending, 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.
11. C. stirrup end of Zuocheng hook, hook form according to design requirements.
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, the design called for: I grade T42 steel welding rod used, Ⅱ grade steel welding rod with T50 .
(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., in the weld after welding without gaps, cracks and large metal welding tumor, when struck with a hammer, should be issued with the same crisp sound reinforcement. End of the twisted steel, bent or cut straight to school.
(4) axial tension and small eccentric piece of steel rod joints are welded. Ordinary concrete
 

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