The pipe network where the accident occurred was the main heating network of Daxue Road DN450, which was built at 1995. Affected by this impoundment, the heating of about 370,000 square meters in the areas east of songshan road, north of Zhongyuan Road, west of Daxue Road and south of Mianfang Road was suspended, and the heating of other affected areas was gradually restored. After the explosion, a pedestrian riding an electric car accidentally fell into the road subsidence area and died. Another passer-by was burned during the rescue and has been taken to hospital for treatment. At present, the emergency repair work is being carried out intensively.
Cause of pipe explosion
1, ambient temperature is too low.
The structure of central heating pipeline is mostly cleavage crack, and the energy absorbed by it is closely related to the ambient temperature. When the ambient temperature is too low, the energy absorbed by cleavage crack propagation decreases, which is easy to cause cleavage fracture.
2, the water flow loading speed is too large.
It will not only affect the material strain influence index of central heating pipeline, but also affect the cleavage crack propagation strain. High strain rate easily leads to cleavage fracture.
3, central heating pipeline extended service.
In many areas of our country, due to the great complexity and high cost of pipeline laying, many central heating pipelines have been used for a long time, and they cannot be repaired in time when problems such as aging or failure occur, which is very likely to lead to tube explosion accidents.
4. Poor pipeline construction quality
When laying central heating pipeline, uneven or excessive settlement of ground pipe trench caused by unequal trench bottom is easy to lead to gradual damage of pipeline joints and even pipeline fracture. When workers expand the wellhead pipeline, the pressure on both sides of the pipeline will increase continuously, which greatly increases the possibility of central heating pipeline bursting.