压力隧洞复合预应力混凝土衬砌修补加固防渗结构计算分析及其施工工艺
发布时间：2018-07-31 09:12
【摘要】：复合预应力混凝土衬砌修补、加固防渗方案是在原衬砌混凝土上二次浇筑一高性能纤维混凝土薄层,在新老混凝土中间设置薄钢板,通过在老混凝土表面开槽等手段,在老混凝土与防渗层之间形成一密闭中空的环形空间。利用水泥浆通过有限的径向位移对新浇筑的薄层混凝土根据需要人为地施加某一数值与分布的均布压应力,使二次衬砌混凝土层具有一定数值的环向预压应力。通过对新衬混凝土屈曲破坏和新老混凝土联合受力的分析表明,对于大洞径,选择外加预应力法对新内衬混凝土层施加预应力,理论上是可行的,这样可以分担部分的内水压力,而使该方案具有预应力混凝土补强加固效果及复合防渗功能。其优点是不仅省去预应力筋,达到防渗加固效果,而且施工简便,损失过水断面较小。
[Abstract]:Composite prestressed concrete lining repair, reinforcement and seepage prevention scheme is to put a high performance fiber concrete thin layer on the original lining concrete, set thin steel plate in the middle of the new and old concrete, through the old concrete surface slotted, etc. A closed and hollow annular space is formed between the old concrete and the impervious layer. A numerical and distributed uniform compressive stress is applied to the newly cast thin-layer concrete by using the cement slurry through finite radial displacement, which makes the secondary lining concrete layer have a certain value of circumferential preloading stress. Through the analysis of the buckling failure of new lining concrete and the combined force of new and old concrete, it is shown that it is theoretically feasible to select the external prestress method to apply prestress to the new lining concrete layer for the large hole diameter. In this way, the internal water pressure can be shared, and the scheme has the function of reinforcing and strengthening prestressed concrete and compound seepage prevention. The advantages of this method are that it not only saves the prestressing tendons and achieves the effect of seepage prevention and reinforcement, but also has the advantages of simple construction and small loss of overwater section.
【作者单位】： 中国水利水电科学研究院;河北省水利工程局第一工程处;
【分类号】：TV554
[Abstract]:Composite prestressed concrete lining repair, reinforcement and seepage prevention scheme is to put a high performance fiber concrete thin layer on the original lining concrete, set thin steel plate in the middle of the new and old concrete, through the old concrete surface slotted, etc. A closed and hollow annular space is formed between the old concrete and the impervious layer. A numerical and distributed uniform compressive stress is applied to the newly cast thin-layer concrete by using the cement slurry through finite radial displacement, which makes the secondary lining concrete layer have a certain value of circumferential preloading stress. Through the analysis of the buckling failure of new lining concrete and the combined force of new and old concrete, it is shown that it is theoretically feasible to select the external prestress method to apply prestress to the new lining concrete layer for the large hole diameter. In this way, the internal water pressure can be shared, and the scheme has the function of reinforcing and strengthening prestressed concrete and compound seepage prevention. The advantages of this method are that it not only saves the prestressing tendons and achieves the effect of seepage prevention and reinforcement, but also has the advantages of simple construction and small loss of overwater section.
【作者单位】： 中国水利水电科学研究院;河北省水利工程局第一工程处;
【分类号】：TV554
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