Leakage detection ditch for building protection in large-thickness collapsible loess area

Abstract

The invention provides a leakage detection ditch for building protection in a collapsible loess area. By the adoption of the leakage detection ditch, water leakage of laid drainage buried pipelines can be effectively found and eliminated. A leakage detection well is arranged every 100-120 m or so, and each leakage detection well is built close to the closest drainage inspection well or water supply valve within the range of 100-120 m and located in the downstream position. Pipeline faults can be found rapidly, and the leakage detection range is effectively shortened. The leakage detection ditch is provided with water collecting pits which are 300 mm deep, wherein each water collecting pit is arranged at the bottom of the corresponding leakage detection well with a certain slope and orientation (should be larger than 0.02), and the pits are used for collecting water leaked from the pipelines. As for an area where the water collecting pits cannot be arranged due to site condition limitation, a water fender used for blocking water flow can be arranged in the position where each water collecting pit should be arranged originally, the end face of one side of each water fender is attached to the ditch wall of the leakage detection ditch, and the interval H between the end face of the other side of each water fender and the ditch wall of the leakage detection ditch is 200-300 mm. In the leakage detection process of the leakage detection ditch, an operator can observe whether water flow exists in the notch or not from the position above the leakage detection well so as to judge whether the upstream pipeline leaks water or not.

Description

technical field [0001] The invention relates to a leak detection ditch used for building protection in collapsible loess areas, and belongs to the technical field of fixed structures. The leak detection ditch can quickly detect the leakage phenomenon of the pipeline in the leak detection ditch. Background technique [0002] In the national standard, the leak detection pipe ditch (hereinafter referred to as the leak detection ditch) is a buried water supply and drainage pipe ditch set up within the protection range of buildings in collapsible loess areas. Leakage of buried water supply and drainage pipelines within the scope, and maintenance and repair of pipelines. According to different waterproof requirements, leak detection trenches with different waterproof levels can be used, but they must not leak, must have a certain slope (preferably greater than 0.02), and must not borrow other buildings and equipment foundations, leak detection well walls, etc. as ditch walls. Th...

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Problems solved by technology

The relevant national and local codes and atlases in collapsible loess areas at this stage describe the principle of setting up leak detection wells as follows: "Leak detection wells should be set at the end of the outdoor leak detection pipe trench and along the line of the pipe trench within the protection distance of the building. The sub-section leak detection point", but the national standard does not make clear regulations on the sub-section leak detection point

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