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    冷拉鋼筋施工及試驗要求
    發布日期:2018-02-18       點擊數:231       

    冷拉鋼筋的施工方法:

    ?
    1.在負溫下冷拉后的鋼筋,應逐根進行外觀質量檢查,其表面不得有裂紋和局部頸縮。
    ?
    2.當溫度低于-20℃時,嚴禁對鋼筋進行冷彎操作,以避免在鋼筋彎點處發生強化,造成鋼筋脆斷。
    ?
    3.冬季在負溫條件下焊接鋼筋,應盡量安排在室內進行。如必須在室外焊接,其環境溫度不宜低于-20℃,雪天不得施焊,風力超過3級時應有擋風措施。焊后未冷卻的接頭,嚴禁碰到冰雪。
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    4.在負溫條件下使用的鋼筋,施工過程中要加強管理和檢驗,在運輸和加工過程中注意防止撞擊、刻痕。

    預應力鋼筋的冷拉試驗要求有哪些:
    ?
    (1)鋼筋冷拉可采用控制應力或控制冷拉率的方法進行,對于用作預應力的冷拉Ⅱ、Ⅲ、Ⅳ級鋼筋,宜采用控制應力的辦法。
    ?
    (2)用控制冷拉率的方法冷拉鋼筋。
    ?
    1)冷拉率必須由試驗結果確定。測定冷拉率用的冷拉應力應符合表1-88的規定。試件所用試件不宜少于4個,取其平均值作為該批鋼筋的實際冷拉率。如因鋼筋強度偏高,平均冷拉率低于1%時,仍應按I%進行冷拉。預應力鋼筋的冷拉率應由廠技術部門審定。
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    2)根據試驗確定的冷拉率,先冷拉3根鋼筋,并在3根鋼筋上分別取3根試件作機械性能試驗,合格后,方可進行成批冷拉。
    ?
    3)混爐批鋼筋不宜采用控制冷拉率的方法進行冷拉。若采用時必須逐根或逐盤測定冷拉率,然后冷拉。
    ?
    (3)用控制應力的方法冷拉鋼筋。
    ?
    1)控制應力及最大冷拉率應符合規定。
    ?
    2)冷拉力應為鋼筋冷拉時的控制應力值乘以鋼筋冷拉前的公稱截面面積。
    ?
    3)冷拉力應采用測力器控制。測力器可根據各廠具體條件和習慣,選用下列幾種:千斤頂、彈簧強力器、鋼筋測力計、電子秤、測力器、拉力表等。
    ?
    4)測力器應定期校棱,校核期限規定如下:
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    (A)使用一般,每6個月檢驗1次,
    ?
    (B)使用較頻繁的,每3個月檢驗1次。
    ?
    (C)長期不用的或檢修后,使用前必須校驗。
    ?
    (D)冷拉時,應測定鋼筋的實際伸長值,以校核冷拉壓力。
    ?
    冷拉鋼筋作業時應注意的問題:
    ?
    (1)鋼筋冷拉前,應先檢查鋼筋冷拉設備的能力和冷拉鋼筋所需的噸位值是否相適應,不允許超載冷拉。特別是用舊設備拉粗鋼筋時應特別注意。
    ?
    (2)為確保冷拉鋼筋的質量,鋼筋冷拉前,應對測力器和各項冷拉數據進行校核,并作好記錄。
    ?
    (3)冷拉鋼筋時,操作人員應站在冷拉線的側向,操作人員應在統一指揮下進行作業。聽到開車信號,看到操作人員離開危險區后,方能開車。
    ?
    (4)在冷拉過程中,應隨時注意限制信號,當看到停車信號或見到有人誤入危險區時,應立即停車,并稍微放松鋼絲繩。在作業過程中,嚴禁橫向跨越鋼絲繩或冷拉線。
    ?
    (5)冷拉鋼筋時,不論是拉緊或放松,均應緩慢和均勻地進行,絕不能時快時慢。
    ?
    (6)冷拉鋼筋時,如遇焊接接頭被拉斷,可重新焊接后再拉,但一般不得超過兩次。
    656彩票

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