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板式楼梯施工缝留设的位置在哪里？

板式楼梯施工缝留设的位置在哪里？

浏览：54次 | 提问时间： 07-03 04:01

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看著別人幸福 07-03 04:01

最普遍的做法是向上做三跑，也就是说施工缝留在上一层楼梯第三个踏步处。
　　按规范4.4.18条“宜留置在结构受剪力较小且便于施工的部位”的规定，一般应留置在楼梯踏步的上三步或下三步的位置。在现浇混凝土结构中，楼梯间两侧墙多为现浇砼墙，楼梯和墙不能同时施工，给楼梯施工缝的的留置带来困难。对楼梯施工缝的留置，提出如下几点：
　　一.框架结构或楼梯间两侧后砌隔墙的，楼梯施工缝应按规范要求留在楼梯踏步的上三步或下三步处。
二.楼梯间两侧为现浇砼墙时，楼梯的施工缝宜把楼梯梁的一半即上跑楼梯梁的全部和休息平台的1/3到1/2处，全留出不浇砼，具体要求是：
1. 下层剪力墙浇筑砼时，上跑一侧(见图一)墙上应留置楼梯梁的梁窝。
2. 下跑楼梯浇筑砼时，休息平台楼梯梁只浇到一半，上跑楼梯梁那部分不浇，而且在上跑楼梯一侧休息平台的1/3—1/2处留置施工缝(见图一)也
3. 不浇筑砼。
4. 楼面浇筑砼时，上跑楼梯梁在剪力墙的支座处须塞泡沫块留置梁窝。
5. 上跑楼梯支模时，将楼梯梁、休息平台、楼梯梁支座处的施工缝表面应剔凿清理干净露出石子。
6. 在上跑楼梯砼浇筑时，接槎处浇水湿润，下一些同砼配合比无石子砂浆细致振实，形成一体。
三. 三.如按叠合梁对待，把梁打到休息平台底或楼板底。这种做法必须严格按4.4.16条叠合面要求处理。
四. 四.板式楼梯，踏步作为受力板支在两侧剪力墙上时，可在平行于踏步板的任何位置甩施工缝。

笑忘书 07-03 04:10

你好，板式楼梯施工缝留设的位置，在钢筋混凝土结构的施工中，大多数工程师通常将梁板构件的混凝土施工缝留置在跨中的三分之一“处”，即距离支座位置三分之一跨的位置。

瞳乱心绪 07-03 04:18

1.施工缝应留置在基础的顶面、梁或吊车梁牛腿的下面、吊车梁的上面、无梁楼板柱帽的下面。
2.和楼板连成整体的大断面梁，施工缝应留置在板底面以下20mm～30mm处。当板下有梁托时，留置在梁托下部。
3.对于长宽比大于二比一的单向板，施工缝应留置在平行于板的短边的任何位置，同时施工缝应垂直留置，不能做成斜槎。
4.有主次梁的楼板，宜顺着次梁方向浇筑，施工缝应留置在次梁跨度中间1/3的范围内。
5.墙上的施工缝应留置在门洞口过梁跨中1/3范围内，也可留在纵横墙的交接处。
6.楼梯上的施工缝应留在踏步板的1/3处。楼梯的混凝土宜连续浇注。若为多层楼梯，且上一层为现浇楼板而又未浇注时，可留置施工缝；应留置在楼梯段中间的1/3部位，但要注意接缝面应斜向垂直于楼梯轴线方向。
注意事项：(施工中存在争执原因是旧规范规定了楼梯施工缝必须留置在中间1/3区段，传统施工留置在向上、下3步处，留置在梯段中间时，理论上是剪力较小，但施工时施工缝质量不好控制，二次支模时容易产生已浇筑部位形成短时“悬挑”，反而不利于构件的质量控制。

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