I. Cause Analysis and Measures

　　钢筋工程是关键控制项目在结构施工阶段,这是影响施工质量的主要因素,但其保护层控制不到位是一个常见的问题在建筑,因为它是一个隐藏的项目,容易被忽略,因此,质量控制不容乐观,目前有一个常见问题的混凝土保护层质量建设。

　　Reinforcement engineering is the key control project in the structural construction stage, which is the main factor affecting the construction quality, but the inadequate control of its protective layer is a common problem in construction, because it is a hidden project, easy to be ignored, therefore, quality control is not optimistic, there is a common problem of concrete protective layer quality construction.

　　钢筋混凝土工程在骨骼和肌肉,称为中发挥着重要作用的结构,强化层控制的一个重要因素直接影响结构的,他的有效高度的压力组件,焊接,锚,钢筋和混凝土耐久性有着直接的影响,否则会降低结构的耐久性与结构的性和使用寿命。

　　Reinforced concrete engineering plays an important role in skeleton and muscle, which is called safety structure. An important factor of strengthening layer control directly affects the safety of structure. Its effective height of pressure components, welding, anchorage, steel and concrete durability have a direct impact. Otherwise, the durability of structure and the safety and service life of structure will be reduced.

　　现浇混凝土楼板负弯矩加固在施工过程中容易被其他工种踩塌。特别是混凝土浇筑过程中的大扰动，使得混凝土保护层厚度难以控制，对混凝土保护层厚度影响较大。

　　Negative moment reinforcement of cast-in-situ concrete floor is easy to be trampled down by other types of work in the construction process. Especially in the process of concrete pouring, the large disturbance makes the thickness of concrete protective layer difficult to control, which has a great impact on the thickness of concrete protective layer.

　　1. 现状分析

　　1. Current Situation Analysis

　　为更好地了解影响底板钢筋保护层厚度的因素，并提出有效的控制方法，进行了以下研究:

　　In order to better understand the factors affecting the thickness of the protective layer of steel bars on the floor and put forward effective control methods, the following studies were carried out:

　　2. 原因分析

　　2. Cause analysis

　　主要原因如下:

　　The main reasons are as follows:

　　1. 管理者职责不明确

　　1. The responsibilities of managers are not clear.

　　检测频率低，导致缺陷无法及时改善。

　　Low detection frequency leads to the defect can not be improved in time.

　　2. 负弯矩杆在板表面垂直和水平重叠

　　2. Vertical and horizontal overlap of negative moment bar on plate surface

　　负弯矩杆的多层迭加导致钢筋骨架高度的增加。

　　The multi-layer superposition of negative moment bars leads to the increase of the height of the steel bar skeleton.

　　3.成品保护意识淡薄

　　3. Weak awareness of product protection

　　这种工种施工队伍和其他施工队伍对成品保护意识不到位，踩踏等情况时有发生。

　　This kind of work construction team and other construction teams are not aware of product protection, trampling and other situations occur from time to time.

　　4、钢箍下沉

　　4. Steel hoop sinking

　　踩踏水槽，倾斜头部，变形。

　　Step on the sink, tilt the head, deform.

　　5、马镫脱位，移动

　　5. Dislocation and movement of stirrups

　　马镫未与板筋系紧或系带不牢固。

　　The stirrups are not tightly tied to the stirrups or the tie is not firm.

　　6. 工人们不够负责任

　　6. Workers are not responsible enough

　　检查发现，部分职工处理工作不到位，责任心不强。

　　Inspection found that some workers do not handle the work in place, the sense of responsibility is not strong.

　　3.实施对策

　　3. Implementing Countermeasures

　　1. 增加检查频率，及时改善缺陷。

　　1. Increase the frequency of inspection and improve defects in time.

　　2、冷拔钢箍的质量、规格进行检验，不合格的不得使用，现场试验是否达到强度要求，或不使用。

　　2. The quality and specifications of cold-drawn steel hoops shall be inspected, and the unqualified hoops shall not be used, and whether the field test meets the strength requirements or not.

　　3、现场冷丝箍筋，扎丝少四点固定，负弯矩箍筋采用焊接固定，并减小箍筋间距，增加箍筋数量，间距为800mm。

　　3. Cold wire stirrups are fixed at least four points by wire binding. Negative moment stirrups are fixed by welding, and the spacing of stirrups is reduced, and the number of stirrups is increased. The spacing is 800 mm.

　　效果:马镫固定牢固，马镫无沉降。

　　Effect: The stirrups are firmly fixed, and there is no settling of the stirrups.

　　4. 用钢管搭建3000(长)2000(宽)300(高)的施工作业平台，防止钢筋被踩踏。

　　4. Build 3000 (long) 2000 (wide) 300 (high) construction platform with steel pipe to prevent steel bar from being trampled.

　　实施效果:了操作人员繁重作业的诸多问题，减少了对钢筋的扰动。

　　Implementing effect: It solves many problems of heavy work of operators and reduces disturbance to steel bar.

　　通过改进施工方法，实现了管理人员和操作人员的技术公开，提高了施工质量。

　　By improving the construction method, the technical disclosure of managers and operators is realized, and the construction quality is improved.