What is the cause of road disease for manhole cover instability? How to prevent the manhole cover from sinking? On the asphalt concrete pavement, inspection of the pavement cracking, glass damage, subsidence and sinking of the manhole cover around the manhole cover are common road quality problems.
Its performance is: after the road is open to traffic (a few days short, about 2a long), the asphalt pavement first occurs around the edge of the manhole cover 10-20 cm, the road ring cracks, and at the beginning, the crack width is very small. However, as time goes by, the cracks widen and the number of cracks may also increase, and the annular belt breaks into multiple pieces. Then check the road surface around the well cover for sinking. Causes the manhole cover to sink slightly; when the progress is to be developed, the road surface around the well will be broken, and the manhole cover will sink seriously (for a short period of time, no more than 2-3 months). This kind of damage to the road surface around the well mostly occurs in the range of 10-30 cm around the manhole cover, some of it exceeds 30 cm, and a few even extend to more than 50 cm of the cover edge. The occurrence of the road disease shows that the occurrence of the disease is closely related to the instability of the inspection well cover. When the inspection well cover is slightly unstable, the surrounding road surface only shows cracking; when the instability increases, the width of the pavement around the well increases. The crack teaches to increase. Settlement occurs on the manhole cover and surrounding road surface; when the instability increases again. The degree of damage to the road surface around the manhole cover increased, and the manhole cover and the surrounding road surface significantly sank. Because this road disease is mainly caused by the instability and sinking of the inspection manhole cover. It is called the common quality defect of asphalt concrete pavement manhole cover instability, and referred to as manhole cover instability road disease.
There are four ways to prevent the manhole cover from sinking:
1. If the design scale of the well cover and wellbore and the well-around structure is low, it needs backfilling around the well and no item reinforcement design for each structural layer of the well-around road surface.
2. The structural rigidity difference between the viewing well and the path around the well is large, and it must not settle due to its own weight and vehicle load.
3. Reasonable design should be carried out for planning and laying pipeline projects in the range of motorized vehicle lanes.
4. When installing the manhole cover, pay attention to the large number of heavy overloaded vehicles in urban traffic, and check the well and the surrounding area for damage.
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