I. Cause Analysis and Measures

　　鋼筋工程是關鍵控制項目在結構施工階段,這是影響施工質量的主要因素,但其保護層控制不到位是一個常見的問題在建筑,因為它是一個隱藏的項目,容易被忽略,因此,質量控制不容樂觀,目前有一個常見問題的混凝土保護層質量建設。

　　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.

　　鋼筋混凝土工程在骨骼和肌肉,稱為中發揮著重要作用的結構,強化層控制的一個重要因素直接影響結構的,他的有效高度的壓力組件,焊接,錨,鋼筋和混凝土耐久性有著直接的影響,否則會降低結構的耐久性與結構的性和使用壽命。

　　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.

　　現澆混凝土樓板負彎矩加固在施工過程中容易被其他工種踩塌。特別是混凝土澆筑過程中的大擾動，使得混凝土保護層厚度難以控制，對混凝土保護層厚度影響較大。

　　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. 現狀分析

　　1. Current Situation Analysis

　　為更好地了解影響底板鋼筋保護層厚度的因素，并提出有效的控制方法，進行了以下研究:

　　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. 管理者職責不明確

　　1. The responsibilities of managers are not clear.

　　檢測頻率低，導致缺陷無法及時改善。

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

　　2. 負彎矩桿在板表面垂直和水平重疊

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

　　負彎矩桿的多層迭加導致鋼筋骨架高度的增加。

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

　　3.成品保護意識淡薄

　　3. Weak awareness of product protection

　　這種工種施工隊伍和其他施工隊伍對成品保護意識不到位，踩踏等情況時有發生。

　　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、鋼箍下沉

　　4. Steel hoop sinking

　　踩踏水槽，傾斜頭部，變形。

　　Step on the sink, tilt the head, deform.

　　5、馬鐙脫位，移動

　　5. Dislocation and movement of stirrups

　　馬鐙未與板筋系緊或系帶不牢固。

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

　　6. 工人們不夠負責任

　　6. Workers are not responsible enough

　　檢查發現，部分職工處理工作不到位，責任心不強。

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

　　3.實施對策

　　3. Implementing Countermeasures

　　1. 增加檢查頻率，及時改善缺陷。

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

　　2、冷拔鋼箍的質量、規格進行檢驗，不合格的不得使用，現場試驗是否達到強度要求，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、現場冷絲箍筋，扎絲少四點固定，負彎矩箍筋采用焊接固定，并減小箍筋間距，增加箍筋數量，間距為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:馬鐙固定牢固，馬鐙無沉降。

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

　　4. 用鋼管搭建3000(長)2000(寬)300(高)的施工作業平臺，防止鋼筋被踩踏。

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

　　實施效果:了操作人員繁重作業的諸多問題，減少了對鋼筋的擾動。

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

　　通過改進施工方法，實現了管理人員和操作人員的技術公開，提高了施工質量。

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