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sadreh - درز انبساط و درز انقطاع چیست؟

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درز انبساط و درز انقطاع چیست؟

» نوع مطلب : مقاله ها ،

 

برای جلوگیری از خرابیهای ناشی از انبساط و انقباض ساختمان بر اثر تغییر درجه حرارت محیط خارج یا جلوگیری از انتقال بار ساختمان قدیمی مجاور به ساختمانی كه جدید احداث می شود ، همچنین در مواردی كه ساختمان بزرگ است و از چند بلوك متصل به هم تشكیل می شود ، باید به كار بردن درز انبساط در محل مناسب پیش بینی شود . حداقل فاصله ای از ساختمان با اجزای ساختمانی كه باید در آن درز انبساط پیش بینی شود ، به نوع ساختمان ، تعداد طبقات ، مصالح مصرفی و آب و هوای محل احداث بستگی دارد ؛ بنابراین باید با مطالعه كافی محل اندازه آن را مهندس طراح تعیین كند. در كلیه ساختمانهای فلزی كه طول آنها بیشتر از  50  متر باشد ، باید در طول ساختمان درز انبساط پیش بینی كرد .

 

 

این طول مربوط به ساختمانهای فلزی و بدون پوشش محافظ است كه نباید از  50  متر و یا در ساختمانهایی با پوشش محافظ  و در حالات خاص نباید از یكصد متر تجاوز كند. برای پوشاندن و پر كردن فواصل درز انبساط از مواردی استفاده می كنند كه قابلیت ارتجاعی داشته باشد . باید دقت شود كه فاصله درز انبساط به هیچ وجه با مصالح بنایی یا ملات پر نگردد. اگر در هنگام استقرار اسكلت فلزی ، ستونهایی كه در مجاورت یك درز انبساط قرار دارند ، به طور موقت به وسیله قطعات فلزی متصل شده اند ، پس از استقرار ، باید این اتصالات بریده شوند تا ساختمان در محل درز انبساط به كلی از قسمت مجاور خود جدا باشد.

 

درز انقطاع  :

برای جلوگیری از خسارت و كاهش خرابی ناشی از ضزبه ساختمانهای مجاور به یكدیگر ، بویژه در زمان وقوع زلزله ، ساختمانهایی كه دارای ارتفاع بیش از  12  متر یا دارای بیش از  4  طبقه هستند ، باید به وسیله درز انقطاع از ساختمانهای مجاور جدا شوند ؛ همچنین حداقل درز انقطاع  در تراز هر طبقه برابر  100/1  ارتفاع آن تراز از روی شالوده است . این فاصله را می توان در محلهای لازم با مصالح كم مقاومت كه در هنگام زلزله در اثر برخورد دو ساختمان به آسانی مصالح مزبور خرد می شوند ، پر كرد.


نوشته شده در : سه شنبه 3 دی 1387  توسط : R.k.    نظرات() .

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