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The main application of Trenchless construction technology of underground pipe includes pipe jacking, directional drilling and crossing technology, and large section rectangular channel tunneling technology. 

 

Underground Pipe Trenchless Construction: Pipe jacking Technology

 

Pipe jacking is a construction method for laying pipes in soft soil or water rich and soft strata. With the continuous development and maturity of pipe jacking technology, a large number of super large diameter and long distance pipe jacking projects have been sprung up. The maximum diameter of the concrete pipe jacking pipe reaches 4000mm, and the maximum distance of the first entry is 2080m. With the emergence of a large number of super long distance and super large caliber pipe jacking engineering, the corresponding new pipe jacking construction technology has also been produced.
 

 

1. to maintain the long distance jacking of the earth pressure balance, with constant jacking speed and multistage Jacking under the condition of intelligent screw machine speed unearthed construction technology; the new technology combined with the analysis to determine the soil pressure fluctuations reasonable range of parameters, to adapt to changes in the earth pressure intelligent pipe jacking machine, avoid large vibration.

 

2. a fully automatic grouting system is developed for the super large caliber and super long distance jacking process. The automatic grouting system is developed, which can allocate the grouting volume intelligently and effectively reduce the local resistance.

 

3. long distance, multi curve jacking automatic measurement and deviation prediction technology is by far the most suitable measurement system for long distance, curve jacking, the measurement system using multiple measurement robot tracking, combined with the historical data, the tool pipe direction and amplitude of the forecast, greatly improved the quality of the top in the pipeline and pipe jacking efficiency.

 

4. prestressed steel tube concrete pipe jacking (JPCCP) splicing technology, using auxiliary rail, vice top and main roof omni directional three dimensional form to adjust the joint interface, it can effectively solve the new composite pipe high precision interface splicing problem.

 

Underground Pipe Trenchless Construction: Directional Drilling Crossing Technology

 

According to the design of buried and excavated through the curve, then according to the cross curve by crossing drilling drilled the first guide hole, and then expanding treatment, after the pull back wall and lubrication pipeline with mud will have pressure test qualified prefabricated pipe to pull back, to complete the construction of pipeline laying. Its new technologies include:

 

1. measuring the location of drill bit while drilling system. The key technology of MWD is to seal the drill pipe body and seal the connection of permanent cable in the drill pipe under the premise of ensuring the strength of drill pipe.

 

2. a new rotary steering drilling system with a hole bottom motor. The system effectively solves the life problem of stator and bearing, and can rotate drilling according to the set direction.

 

3.  tunneling construction technology of large section rectangular underground passage.