CN116607770A - 一种大体积混凝土中埋入式型钢柱脚的施工方法 - Google Patents
一种大体积混凝土中埋入式型钢柱脚的施工方法 Download PDFInfo
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Abstract
本发明公开了一种大体积混凝土中埋入式型钢柱脚的施工方法属于建筑施工技术领域,具体步骤如下:(一)基础底板下层钢筋及型钢柱竖向钢筋绑扎;(二)地脚锚栓定位预埋;(三)下层混凝土浇筑;(四)安装锚固钢筋;(五)下层混凝土养护;(六)施工缝凿毛并清理;(七)型钢柱安装及高强灌浆料二次灌注;(八)基础底板上层钢筋及型钢柱竖向钢筋绑扎;(九)上层混凝土浇筑;(十)对基础表面混凝土进行压光;(十一)基础养护。本发明将混凝土分层施工,使下层混凝土提前散热,并与上层混凝土水化热峰值期错开,有效减少混凝土结构养护时间,大大降低大体积混凝土里表温差带来的开裂风险。
Description
技术领域
本发明属于建筑施工技术领域,具体涉及一种大体积混凝土中埋入式型钢柱脚的施工方法。
背景技术
在建筑施工过程中,混凝土结构墙、柱、梁等留置冷缝分多层浇筑的施工方法应用十分广泛,针对结构尺寸大、造型复杂等情况的混凝土结构施工,留置冷缝分多层浇筑的施工方法已被证明是一种施工便捷、质量可靠、效益较高的施工方法。现有大体积混凝土基础施工施工技术为一次浇筑成型,但针对大体积混凝土中的埋入式型钢柱脚的施工该技术存在以下缺点:
1、大体积混凝土厚度较大,上层钢筋绑扎对钢筋支架要求较高,存在安全性低、工期长、成本高的问题;
2、一次浇筑大体积混凝土结构厚度较大,结构水化热较大,易产生里表温差过大,导致混凝土裂缝;
3、钢柱脚位置需预留用于型钢柱安装的二次浇筑区域,二次浇筑混凝土与一次浇筑混凝土结合较差,易产生裂缝;
4、预留二次浇筑区域钢筋需预留过人洞口,型钢柱脚位置上层钢筋需留置较多接头,型钢柱脚位置结构性能较差;
5、上部钢筋已绑扎,型钢柱吊装施工难度较大,工期久。
发明内容
为解决上述问题,本发明公开了一种大体积混凝土中埋入式型钢柱脚的施工方法,通过调整分层的厚度和间隔时间,可以达到混凝土散热、混凝土结构水化热错峰的效果,大大减小了表温差过大导致混凝土裂缝的风险;型钢柱脚位置无需预留二次浇筑区域,大体积混凝土基础整体性大大增加,结构性能大大提高,不易产生裂缝。
为达到上述目的,本申请的具体技术方案如下:
一种大体积混凝土中埋入式型钢柱脚的施工方法,具体步骤如下:
(一)基础底板下层钢筋及型钢柱竖向钢筋绑扎;
(二)地脚锚栓定位预埋;
(三)下层混凝土浇筑,所述下层混凝土浇筑上表面即为施工缝;
(四)下层混凝土终凝前30min内,直接***放置安装锚固钢筋;
(五)下层混凝土养护;
(六)施工缝凿毛并清理;
(七)型钢柱安装,高强灌浆料二次灌注;
(八)基础底板上层钢筋及型钢柱竖向钢筋绑扎;
(九)上层混凝土浇筑 ;
(十)上层混凝土终凝前,对上层混凝土表面进行压光;
(十一)基础养护。
基于上述技术特征,进一步的,:步骤四中的锚固钢筋中部设置***终止标志,锚固钢筋横向等间距分布在下层混凝土中 ,锚入上下层混凝土的总长度不小于锚固钢筋所需的锚固长度。
基于上述技术特征,进一步的,步骤七中所述高强灌浆料为CGM系列高强度无收缩灌浆料,强度大于等于C40。
基于上述技术特征,进一步的,步骤七中二次灌浆采用压力灌浆。
基于上述技术特征,进一步的,步骤九与步骤三间隔时间不少于2天,实际考虑到工程进度一般间隔时间不大于7天。
基于上述技术特征,优选的,基础混凝土包括下层混凝土和上层混凝土,所述基础混凝土大于等于两层,相邻两层混凝土的厚度之和不小于1m。
基于上述技术特征,优选的,所述基础混凝土每层的分层位置均留置水平施工缝,并设置锚固钢筋。
基于上述技术特征,优选的,步骤六中施工缝无需收光。
优选的,所述基础底板下层钢筋下方设有混凝土垫层,所述混凝土层强度不小于C15。
与现有技术相比,本发明的有益效果为:
1、大体积混凝土分层施工,基础底板上层钢筋绑扎时,下层混凝土已完成施工,早绑扎基础底板上层钢筋支架时高度大大降低,安全性、经济型大大提高;
2、大体积混凝土分层施工,通过调整分层的厚度和间隔时间,可以达到混凝土散热、混凝土结构水化热错峰的效果,大大减小了表温差过大导致混凝土裂缝的风险;
3、型钢柱脚位置无需预留二次浇筑区域,施工缝位置通过锚固钢筋及凿毛处理措施,大体积混凝土基础整体性大大增加,结构性能大大提高,不易产生裂缝;
4、型钢柱脚位置无需预留过人洞口,型钢柱安装时,上层钢筋未开始绑扎,故不会出现接头集中情况,进而施工难度大大减小,工期加快,经济效益显著。
附图说明
图1为本发明一种大体积混凝土中埋入式型钢柱脚的施工方法的结构示意图;
附图标识列表:
1、基础底板下层钢筋;2、下层混凝土;3、混凝土垫层;4、防水层; 5、施工缝;6、锚固钢筋;7、上层混凝土;8、基础底板上层钢筋;9、型钢柱竖向钢筋;10、地脚锚栓;11、高强灌浆料;12、型钢柱。
实施方式
下面结合附图和具体实施方式,进一步阐明本发明,应理解下述具体实施方式仅用于说明本发明而不用于限制本发明的范围。
需要说明的是,下面描述中使用的词语 “上”、“下”、“左”、“右”、指的是附图中的方向,词语“内”和“外”分别指的是朝向或远离特定部件几何中心的方向。
如图1 所示,一种大体积混凝土中埋入式型钢柱脚的施工方法, 包括以下步骤:
(一)基础底板下层钢筋1及型钢柱竖向钢筋9绑扎;优选的,所述基础底板钢筋1;下方还设有混凝土垫层3,所述混凝土垫层3的强度不小于C15;
(二)地脚锚栓10定位预埋;
(三)下层混凝土2浇筑:从左边向另右边推移,均匀分层浇筑,所述下层混凝土2上层即为施工缝5,所述施工缝5呈水平状态;
(四)下层混凝土2终凝前,直接***安装锚固钢筋6,所述锚固钢筋6中部设置***终止标志;锚固钢筋6钢筋的直径及横向布置间距由实际施工情况确定,锚入上下层混凝土的长度不小于锚固钢筋6所需的锚固长度La;施工缝5无需收光;
(五)下层混凝土2养护;
(六)施工缝5凿毛处理并清理;
(七)型钢柱12安装,高强灌浆料11二次灌注,优选的,所述高强灌浆料11为CGM系列高强度无收缩灌浆量,强度大于等于C40,并采用压力灌浆;
(八)基础底板上层钢筋8及型钢柱竖向钢筋9绑扎;
(九)上层混凝土7浇筑:从左边向另右边推移,均匀分层浇筑;
(十)上层混凝土7终凝前,对上层混凝土7表面进行压光;
(十一)基础养护。
需要说明的是,步骤三与步骤九浇筑方式均为水平分层浇筑,从一边向另一半推移。步骤九与步骤三间隔时间不少于2天,考虑到实际工程的进度,一般间隔时间不大于7天,以防耽误工期。
基础混凝土包括下层混凝土和上层混凝土,但不仅限于只包含所述下层混凝土和上层混凝土;基础混凝土大于等于两层,且相邻两层混凝土的厚度之和不小于1m,优选的,每一层混凝土不小于0.5m。每一层的分层位置均留置水平施工缝,并等间距设置锚固钢筋。
综上所述本发明可以将大体积混凝土中埋入式型钢柱脚施工分解,有效降低施工难度、提高安全性;混凝土分层施工,可以使下层混凝土提前散热,并与上层混凝土水化热峰值期错开,有效减少混凝土结构养护时间,大大降低大体积混凝土里表温差带来的开裂风险;施工缝处设置锚固钢筋并凿毛处理,可保障上下层混凝土的整体性;钢筋分层绑扎,可降低型钢柱脚安装难度,减小钢筋支架高度,实现降本增效。
需要说明的是,附图仅仅说明了本发明的技术思想,不能以此形状限定本发明的保护范围,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰均落入本发明权利要求书的保护范围之内。
Claims (10)
1.一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:包括以下步骤:
(一)基础底板下层钢筋(1)及型钢柱竖向钢筋(9)绑扎;
(二)地脚锚栓(10)定位预埋;
(三)下层混凝土(2)浇筑,所述下层混凝土(2)浇筑上表面即为施工缝(5);
(四)下层混凝土(2)终凝前30min内,直接***放置安装锚固钢筋(6);
(五)下层混凝土(2)养护;
(六)施工缝(5)凿毛并清理;
(七)型钢柱(12)安装,高强灌浆料(11)二次灌注;
(八)基础底板上层钢筋(8)及型钢柱竖向钢筋(9)绑扎;
(九)上层混凝土(7)浇筑;
(十)上层混凝土(7)终凝前,对上层混凝土(7)表面进行压光;
(十一)基础养护。
2.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:步骤四中的锚固钢筋(6)中部设置***终止标志,锚固钢筋(6)横向等间距分布在下层混凝土中,锚入上下层混凝土的总长度不小于锚固钢筋所需的锚固长度。
3.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:步骤七中所述高强灌浆料(11)为CGM系列高强度无收缩灌浆料,强度大于等于C40。
4.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:步骤中七二次灌浆采用压力灌浆。
5.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:步骤九与步骤三间隔时间不少于2天。
6.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:基础混凝土包括下层混凝土(2)和上层混凝土(7),所述基础混凝土大于等于两层,相邻两层混凝土的厚度之和不小于1m。
7.根据权利要求6所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:所述基础混凝土每层的分层位置均留置水平施工缝,并设置锚固钢筋。
8.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:步骤六中施工缝(5)无需收光。
9.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于:所述基础底板下层钢筋(1)下方设有混凝土垫层(3),所述混凝土层(3)强度不小于C15。
10.根据权利要求1所述的一种大体积混凝土中埋入式型钢柱脚的施工方法,其特征在于步骤三与步骤九浇筑方式为水平分层浇筑,从一边向另一半推移。
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