The gutter refers to the concave part between the two crotches of the roof of a building. Roof drainage is divided into organized drainage and unstructured drainage (free drainage). Organized drainage generally collects rainwater into the gutter and then drains it down by rainwater pipes. The gutter that collects rainwater is called the gutter. The gutter is divided into inner gutter and outer gutter. The inner gutter refers to the gutter within the outer wall, which generally has a parapet wall. The outer gutter is the gutter that pulls out the outer wall, and there is no parapet wall. Tiangou is made of white iron sheet or asbestos cement.
In the construction, the engineering quantity of the trench is calculated by volume according to the design size, without deducting the volume of steel bar and embedded iron parts in the component.
The shortcomings of the Inner Tiangou are as follows:
1. The construction is difficult and the requirements of anticorrosion and rust prevention are high.
2. Complex replacement process
3. Easily corroded by rainwater