The jacking box method is a technique used in tunneling heavy construction where a tunnel is constructed by pushing precast concrete segments into the ground using hydraulic jacks. This method has its own set of advantages and disadvantages, which are discussed below:Pros:1. Faster construction: The jacking box method is much faster than traditional tunneling methods. This technique allows for the quick installation of precast concrete segments, which can significantly reduce the construction time
2. Minimal disturbance to the surrounding area: Because the jacking box method is a trenchless technique, it causes minimal disruption to the surrounding environment. This is particularly important in urban areas where construction activities can cause inconvenience to residents
3. Cost-effective: The jacking box method is a cost-effective technique as it reduces the need for excavation and disposal of soil. This results in significant cost savings for the project
4. Improved safety: The jacking box method is considered safer than other tunneling methods as it eliminates the need for workers to enter the tunnel during construction
Cons:1. Limited application: The jacking box method is not suitable for all types of soil conditions. This technique works best in stable soils, and it may not be effective in loose or unstable soils
2. Limited size: The size of the tunnel that can be constructed using the jacking box method is limited by the size of the precast concrete segments. This can be a disadvantage for larger projects
3. Limited access: The jacking box method requires access shafts at both ends of the tunnel, which can be a challenge in urban areas where space is limited
4. High initial cost: The jacking box method requires specialized equipment and expertise, which can result in higher initial costs compared to other tunneling methods
In conclusion, the jacking box method is a useful technique for tunneling heavy construction, but it has its own set of advantages and disadvantages. It is important to carefully evaluate the soil conditions and project requirements before deciding whether to use this technique.
