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土建工程主体结构框架柱、剪力墙的竖向钢筋在施工中发生位移,是质量控制和检查的一个主要内容。其主要原因是浇筑梁板混凝土时,混凝土入模或振捣使钢筋歪斜。 竖筋位移的处理方案,北京市标准《建筑安装分项工程施工工艺规程(第一册)》(以下简称规程)中第5.7.1—1条提出了如图1和图2所示的两种方法。 施工单位通常采用图1的方法,但除按此法将钢筋调正后,又在其钢筋设计位置加同直径的拐筋。拐筋长度一般取40d+200mm(图3)。 我公司监理的工程中,大多数也是用拐筋加强。这种做法有施工单位自行采用的,有甲方提出要求采用的,也有设计人员建议的,目前这种方法已为质检人员接受,并有全面推广之势。
The displacement of the vertical steel bars of the main structural frame columns and shear walls of the civil engineering works during construction is a major part of quality control and inspection. The main reason for this is that when pouring slab concrete, the concrete enters the mold or vibrates to skew the reinforcement. The treatment plan for the displacement of vertical bars is described in Section 5.7.1-1 of the Beijing Standard “Construction Procedures for Construction of Sub-projects for Construction and Installation (Volume 1)” (hereinafter referred to as the “Regulations”) as shown in Figure 1 and Figure 2. Ways. The construction unit usually adopts the method shown in Fig. 1, but in addition to correcting the steel bar according to this method, it also adds a rib with the same diameter to its reinforcing bar design position. The rib length is generally 40d+200mm (Figure 3). Most of the projects in our company’s supervision are also reinforced with crutches. This practice has been adopted by the construction unit itself. It has been proposed by Party A and recommended by designers. At present, this method has been accepted by quality inspectors and has the potential for full promotion.