Emergency Countermeasures for Pipe Jacking Construction

Summary

The video script discusses the pipe jacking construction method, highlighting challenges such as Machine Head retreat and sinking. It offers solutions like welding contact surfaces, using extension rails, adjusting jacking force, and employing steering cylinders to correct deviations. The script also addresses the importance of expert consultation when standard measures fail, ensuring construction quality and safety.

Takeaways

• 🚧 The pipe jacking method is increasingly preferred for laying underground pipelines due to its efficiency.
• 🔨 Improper pipe jacking construction can significantly impact the quality of the construction.
• 🔙 Machine Head retreating can occur due to increased soil pressure when the pipeline is buried deeply.
• 🔧 To address retreating, electric welding can be used to secure the Machine Head to the rail before retracting the lifting jack.
• 🔗 When the Machine Head enters the hole, it should be connected and fastened with a transition ring and the first pipe section.
• 🛠️ An extension rail can be installed at the bottom to prevent the Machine Head from sinking and the tail from rising.
• 🔄 Increasing the number of slurry holes and adjusting the lubricating slurry can manage increased jacking force over longer distances.
• 💡 Adding grouting equipment in the middle of the pipe can help stabilize the jacking process as the distance extends.
• ⚙️ Deviation of the Machine Head can be corrected using the steering cylinder and adjusting the pressure in the soil tank.
• 🗜️ Increasing the torque of the cutter head can be achieved by grouting at the cutter head to improve soil strength.
• ⚠️ If issues like excessive head rotation persist, immediate cessation of jacking and consultation with experts is necessary.

Q & A

What is the primary reason for the popularity of the pipe jacking construction method?

The pipe jacking construction method has become the first choice for many construction parties due to its efficiency in laying underground pipelines.

What can happen if pipe jacking construction is performed improperly?

If pipe jacking construction is not performed correctly, the construction quality can be greatly compromised.

Why does the Machine Head retreat after entering the hole during pipe jacking?

The Machine Head retreats due to the increased soil pressure from the deep burial of the pipeline, which exerts pressure on the Machine Head.

What is the solution for the Machine Head retreating during pipe jacking?

To prevent the Machine Head from retreating, electric welding can be used to firmly weld the contact surface between the Machine Head and the rail.

How can the transition ring and the first pipe section be secured during pipe jacking?

The transition ring and the first pipe section should be connected and fastened with a screw to ensure stability.

What can be done to prevent the Machine Head from sinking and the tail from rising when entering the hole?

An extension rail can be installed at the bottom, and the tool pipe and the rail should be firmly welded to prevent this phenomenon.

How can the jacking force be managed as the jacking distance increases?

As the jacking distance increases, the number of slurry holes in the pipe section can be increased, the proportion of lubricating slurry can be changed, and a set of grouting equipment can be added in the middle of the pipe.

What measures can be taken if the Machine Head deviates during a long jacking distance?

The steering cylinder can be started to correct the deviation, and other measures such as pressing back the counterweight inside the Machine Head or increasing the pressure in the soil tank can be taken.

What can be done to address the problem of excessive head rotation during pipe jacking?

The steering of the cutter head can be used to correct the rotation, and increasing the pressure in the soil tank can help increase the torque of the cutter head.

What should be done if the above measures do not solve the problem during pipe jacking?

If the problem persists despite the measures taken, the jacking should be stopped immediately, and the issue should be reported to an expert group for further study and solution.

Why is it important to address issues like Machine Head retreating or sinking during pipe jacking?

Addressing these issues is crucial to ensure the construction quality and safety of the underground pipeline project.