Hole collapse accident treatment
Hole collapse is one of the common accidents of rotary drilling. There are many reasons for hole collapse, such as quality problems of casing; failure to replenish grout in time; quality problems of mud, or too fast lifting speed of drill bit, etc. These problems may cause hole collapse accidents.
Prevention should be the main treatment for hole collapse accidents, and effective preventive measures should be used to reduce the probability of hole collapse accidents. During the drilling construction process, first of all, the mud should be reasonably selected to ensure that the quality of the mud meets the standard requirements.
Secondly, attention should be paid to the control of the quality of the casing, and at the same time, the casing should be firmly placed in the same center as the hole. Thirdly, the timeliness of grouting should be ensured during the drilling construction process, and the grouting time should be controlled within 3 hours. Finally, the lifting speed of the drill bit should be reasonably controlled to avoid hole collapse accidents caused by lifting too fast.
These are all effective preventive measures that can reduce the probability of hole collapse accidents.
If a hole collapses during the drilling process, construction should be stopped immediately, the collapse handled immediately, and the specific cause found. If the collapse is relatively mild, backfill with high-viscosity mud. If it is serious, backfill with clay, and construction can only be continued 15 days after backfilling.
Handling of pipe-blocking accidents
Pipe blocking is also one of the more common types of accidents in applying bridge-bored pile rotary drilling and hole-forming construction technology. There are also many reasons for pipe blocking accidents, such as long pouring time leading to concrete siltation and conduit blockage; the buried depth of the conduit is too large; the airtightness of the conduit being insufficient; the pouring speed being too fast, etc.
For the prevention of pipe-blocking accidents, targeted measures should be taken in combination with the causes of pipe-blocking. For example, keep pouring concrete at a uniform speed, and pay attention to controlling the slump of concrete. Under normal circumstances, the slump should be controlled at about 20 cm.
Secondly, adding a coagulant to concrete appropriately can delay the concrete’s initial setting time and help avoid pipe blockage accidents. During the construction process, attention should be paid to monitoring the orifice conditions, and concrete should be added when the orifice is no longer slurrying. After use, the catheter should be thoroughly flushed to ensure the cleanliness of the catheter, and to avoid pipe blockage accidents caused by insufficient cleanliness of the catheter. If pipe blockage occurs, it is necessary to use steel bars to clear the upper part of the catheter.
Handling of broken pile accidents
The main reasons for broken piles are poor matching between the concrete poured successively, which makes it easy to break; the catheter is blocked, which affects the pouring and pile formation effect, and then the pile breakage accident occurs.
For the broken pile accident, prevention work should also be done well.
First of all, attention should be paid to the control of the catheter’s quality to ensure the catheter’s tensile strength At the same time, the inner diameter of the catheter should be consistent.
Secondly, the catheter should be cleaned well after it is applied. A high-pressure water gun can be used for flushing to remove debris and ensure that its inner wall is clean. Finally, the catheter should be inspected before the water tightness test is carried out to check its tightness.
For more details on specific adjustments and maintenance practices, consult another article or contact a qualified technician.
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