When the concrete is poured into the concrete, the formwork is lined with white tubes. What is that for?
This is a through - wall bolt sleeve that is capable of pulling out through - wall bolts after concrete placement has been completed. PVC plastic pipes are generally used for through wall bushings, and the diameter is generally larger than that of through wall bolts. The steel bar can pass through the steel bars.
Used between the inner and outer wall or column template template Rachel, concrete under the lateral pressure and other loads, ensure the spacing inside and outside the template can meet the design requirements, but also the template and its support structure fulcrum, influence of wall bolt layout integrity, the template structure stiffness and strength.
Through the wall bolts generally use both ends of the wire round bolts, also known as the pull bolts, but also useful, both ends of the flat steel stay long Kong Yong wedge iron inserted into the fixed wedge.
Early wall bolt not used in casing, after the completion of concrete pouring in concrete wall bolt, the bolt ends exposed on the outside part of the concrete cut off, it directly resulted in the increase of cost. In recent years, in order to save the construction cost, so that the wall bolt can turnover, PVC plastic pipe for the bolt rope and then placed in the corresponding position within the template, after pouring concrete and reaches a certain intensity, can be pumped out by bolt.
Note that, because the casing has a certain influence on the strength of concrete, so the use of casing, wall bolt quantity is not too much, in order to meet the conditions of use, to minimize the use of wall bolt, it can effectively reduce the influence of casing on concrete strength.
