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求大神说说什么时候设沉降缝？有没有人清楚？

求大神说说什么时候设沉降缝？有没有人清楚？

浏览：39次 | 提问时间： 07-21 10:02

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别再互相折磨 07-21 10:03

伸缩缝、沉降缝、变形缝的区别变形缝是为了避免建筑由于温度变化、建筑物各部分所受荷载的不同以及建筑物相邻部分结构的差异和地震的影响而使建筑物出现变形、开裂、建筑结构破坏而设置的将建筑物垂直分开的缝隙。变形缝包括伸缩缝、沉降缝、防震缝。
1、伸缩缝伸缩缝，也叫温度缝，是防止由温度影响产生变形而设置的变形缝。伸缩缝要从基础顶面开始，将墙体、楼板、屋顶全部断开。基础部分因埋置于地下，受温度影响较小，所以不必断开，如建筑屋顶采用瓦屋面，屋顶部分也无需另做伸缩缝。伸缩缝的间距与构件所用材料、结构类型、施工方法、构件所处位置和环境等均有密切的关系。
2、沉降缝沉降缝是防止因荷载、结构形式、地基能力的差异等原因而产生不均匀沉降的影响所设的变形缝。沉降缝是将建筑物垂直方向划分为若干个刚度较一致的单元，使相邻单元可以自由沉降，而不影响建筑的整体。应设置沉降缝的情况有：
（1）建筑平面的转折部位；
（2）高度差异（或荷载差异）处；
（3）长高比过大的砌体承重结构或钢筋混凝土框架结构的适当部位；
（4）地基土的压缩性有显著差异处；
（5）建筑结构（或基础）类型不同处；
（6）分期建造建筑的交界处。伸缩缝与沉降缝最显著的区别是伸缩缝只设在墙、楼地面、屋顶上，基础不设缝。沉降缝则从屋顶到基础，全部构件部位均需设缝分开。这两种缝相同之处是，都要保证缝的两侧构件均能自由伸缩而互不影响。缝的表面必须遮盖妥善，不得渗漏。一般沉降缝同时可起伸缩缝的作用，而伸缩缝不能代替沉降缝。伸缩缝的宽度一般采用20～30mm，沉降缝的缝宽与建筑的层数有关，缝宽的规定.沉降缝应有足够的宽度，缝宽可按选用

JustDot 07-21 10:12

当房屋相邻部分的高度、荷载和结构形式差别很大而地基又较弱时，房屋有可能产生不匀均沉降，致使某些薄弱部位开裂。为此，应在适当位置如复杂的平面或体形转折处、高度变化处、荷载、地基的压缩性和地基处理的方法明显不同处设置沉降缝。沉降缝与伸缩缝不同之处是除屋顶、楼板、墙身都要断开外，基础部分也要断开，使相邻部分也可以自由沉降、互不牵制。沉降缝宽度要根据房屋的层数定，五层以上时不应小于120mm。沉降缝不但应贯通上部结构，而且也应贯通基础本身。沉降缝应考虑缝两侧结构非均匀沉降倾斜和地面高差的影响。抗震缝、伸缩缝在地面以下可不设缝，连接处应加强。但沉降缝两侧墙体基础一定要分开。伸缩缝又称温度缝。其做法为：沿建筑物长度方向每隔一定距离预留缝隙，将建筑物从屋顶、墙体、楼层等地面以上构件全部断开，基础因受温度变化影响较小，不必断开。伸缩缝的宽度一般为20-30mm，缝内应填保温材料，间距在结构规范中有明确规定。

爱不曾保留 07-21 10:20

沉降缝做法规范沉降缝的施工,要求做到使缝两边的构造物能自由沉降,又能严密防止...沉降缝防水处理的方案有很多,下面就给大家介绍一种很常见的解决方案。

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求大神说说什么时候设沉降缝？有没有人清楚？