Shandong Ductile Iron Manhole Cover Manufacturer found that the accidents of injuring people and injuring vehicles caused by damaged manhole cover are common. Small manhole cover has become a headache for many urban road maintenance units, such as settlement of manhole cover and damage around manhole, and has become "invisible bomb" and "cannibalism trap". What are the common problems of well cover?
The traditional well cover stresses are concentrated on the brick wall, which is easy to cause root damage, well cover subsidence and peri-well damage after being rolled and compacted.
An Analysis of the Causes of the Problem
1。 Under the action of vehicle load, because of the different structural stiffness, the deformation of inspection wells is not harmonious with the surrounding pavement, resulting in sudden stress change or stress concentration, and the repeated action will cause pavement cracking。
2。 During the construction of inspection wells, symmetrical compaction is not stopped in accordance with the standard specifications, and the cap and seat of inspection wells are unstable, which does not coincide with the elevation of pavement or the longitudinal and transverse gradients of roads, thus causing vehicle jumping, which will increase the impact on the pavement around the wells。
3. Inspecting the quality problems of well cap and well cap seat or improper application will cause the disease of well cap.
How to restrain "bumping, breaking and ringing", the three major stubborn illnesses of well cover
1. Strict engineering measurement. Strengthen the work of measuring and lofting and checking in engineering to prevent the over-thick slurry setting of wellbore and cover device.
2. Strict construction process. For the construction personnel to stop the device process submission, strict implementation of the relevant construction technology requirements. Strengthen the understanding of the strength of the compacted backfill around the inspection well and enhance the compactness of the slurry of the well seat; strictly control the elevation to ensure that the elevation of the inspection well cover and the well seat coincides with the elevation of the construction design road or the longitudinal and transverse gradients of the road surface; strengthen the management and inspection mechanism of the data; and mix the ingredients manually in the field strictly according to the standard mixing ratio;
3. Strict acceptance criteria. On-site construction and supervision should do a good job of quality acceptance.
4. Strict cap selection. Because of the different material and performance of the inspection covers, it is necessary to separate and inspect the location of the covers and select the appropriate type of covers. For inspecting well covers under motor lanes, priority should be given to those with functions of anti-noise, anti-skid, anti-theft, anti-falling and anti-displacement.
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