Curves are where pipe jacking contractors lose time

Curves are where pipe jacking contractors lose time. It is hard to steer pipes through curves. You face big problems with this task. Alignment systems help keep your tunnel machine straight. Eccentric loads and contact pressure can slow you down. CEGC gives you advice and the right tools for each job.

Key Takeaways

• Curves make pipe jacking harder. Use tough pipes and good alignment systems to get through curves well.

• Watch pipe stress and pressure carefully. This stops damage and keeps your project moving.

• Plan your curve shape and pick the best tunnel machine. This helps you work faster and avoid delays.

Pipe jacking curve challenges

Alignment and navigation issues

It is hard to keep pipes straight in curves. The tunnel machine must follow the path, but curves make this tricky. You need guidance systems to help the tunnel machine go the right way. Navigation systems help you steer when you cannot see the tunnel machine. Microtunnelling Machines are smaller and more exact than big tunnel boring machines, so you have better control.

• Guidance systems help keep the tunnel machine on track in curves.

• Navigation systems let you work even if you cannot see the machine.

• Guided thrust systems help control where the tunnel machine goes.

• Clothoids make the curve change smoother and easier.

• Microtunnelling Machines are better for making curved pipes fit right.

Experts say you should use pipes that are stronger and have joints made for curves. You need to check pipe stress and pressure while jacking. These steps help you avoid mistakes and keep the tunnel machine going the right way.

Eccentric loads and pipe damage

Curves put uneven force on your pipes. Eccentric loads happen when the pipe bends and the jacking force pushes from the side. This makes some spots on the pipe get more stress and can hurt the pipe. You need to watch for joint deflection, which can make the pipe bend wrong and get extra tension.

You need strong pipes and to check them often to stop damage. Pipes with special joints and more strength work better in curves. You should look for stress spots and fix them before they get worse.

Contact pressure and stuck pipes

Curves change how pressure hits your pipes. The inside of the curve gets less pressure than the outside. Eccentric angles push the pipe out, so one side gets more stress. This uneven pressure can make pipes get stuck or break.

You need to watch pressure and stress while jacking. Pipes must be strong enough for these changes. Rules do not always cover curve problems, so you need to use your own checks and good ideas. Watching pipe-soil contact and pipe stress helps you find problems early and keep the tunnel machine moving.

Curves are where contractors lose time

Curves make pipe jacking contractors lose time. When the tunnel machine goes through a curve, there are many problems. These problems slow you down and can make your project late. You have to watch jacking rates, do more surveys, and handle friction. Every step in a curve takes longer than on a straight path. You need to know how picking the right tunnel machine and planning your project can help you finish faster.

Slower jacking rates

Curves slow down pipe jacking because the tunnel machine must move slower. You have to go slow to keep the pipes safe and stop damage. Tunnel boring machines and Microtunnelling Machines work better in curves than auger boring machines, but you still need to slow down. You must check if the pipes are straight and change the machine’s path a lot. This careful work keeps the pipes safe but makes you move less each day. With a TBM tunnel boring machine, you can go at a steady speed, but curves make you stop and check more often. You lose time every time you stop to adjust or check the pipes.

Tip: You can go faster by planning your curve shape and picking the best tunnel machine for your job.

Surveying and realignment needs

Curves make you lose time because you have to survey and fix the tunnel machine’s path a lot. You need to check where the tunnel is going and make sure the pipe follows the plan. Survey teams measure the tunnel and show the right way to go. If the pipe goes off track, you have to stop and fix the machine’s path. This takes time and can make your project late. You need good navigation systems to help steer the tunnel machine in curves. Microtunnelling Machines give you better control, but you still have to check often.

Note: Surveying and fixing the path helps you avoid mistakes, but it slows you down in curves.

Lubrication and friction management

Curves slow you down because friction gets worse in these spots. You have to control friction to keep pipes moving and stop them from getting stuck. Lubrication is very important when jacking pipes in curves. You can use thixotropic mud to make a slippery layer around the pipe. This mud lowers friction and helps the pipe slide through the curve. You have to put the mud in the right places to keep things smooth.

• Thixotropic mud makes friction lower and keeps pipes safe.

• A slurry jacket helps pipes move in curves without getting stuck.

• Good lubrication helps you guess the right jacking force.

• Good models help you plan for friction in different soils.

If you control friction well, your work goes smoother. You lower the chance of accidents and keep your project on time. Automated systems can help you do less work by hand and save time. With a TBM tunnel boring machine, you can move faster each day if you handle friction right. You have to check how much friction the pipe has to pick the right jacking force and plan your project.

You can ask CEGC for help with technical consulting and trenchless engineering support. These services help you fix curve problems and keep your project moving. Curves slow down pipe jacking contractors, but you can finish faster with good advice and the right tools.

Curves can make pipejacking take longer. They cause overcut, stress spots, and pipe bending. Advanced tunnel machines help with tough jobs and cut down overcut. Skilled workers and good planning help control pipejacking loads and stop overcut. You can ask CEGC for help with pipejacking and overcut fixes.

Curves need careful pipejacking, strong joints, and smart machine choices to stop overcut and future problems.

• Overcut makes pipejacking loads and stress spots worse.

• Pipe bending and hard jobs need advanced tunnel machines.

FAQ

Can an auger boring machine replace a Microtunnelling Machine on a sewer project?

You can use an auger boring machine for short and straight jobs. Microtunnelling Machines are better for long, curved, or tricky sewer projects.

At what project scale does a TBM tunnel boring machine become more economical than a Microtunnelling Machine?

Does CEGC offer a combined auger boring machine and Microtunnelling Machine package?

You can ask CEGC for a package with both auger boring and Microtunnelling Machines. This lets you work on many different kinds of projects.