It is really difficult to make a plan for this kind of earthwork excavation with tight construction face but deep foundation pit. The common scheme is island excavation, as mentioned earlier.

1. Combined with local top-down method, an excavation island is established in the middle of the foundation pit (top-down method is adopted), which can be higher than the site standard, and the normal use elevation of the structure is comprehensively considered.

2. The construction roads are built on the island and on-site roads, and the road foundation is also built by reverse method, because the roads have slopes. Basically, the pavement layer will be removed, but the vertical reverse components of the road can be arranged in combination with the structural components.

3. Establish the reverse construction foundation of vertical transportation equipment along the island, and install heavy vertical transportation equipment such as tower cranes.

4. Within a certain elevation range, excavation and transportation can be carried out by building ramps. After reaching a certain depth, you can dig at the bottom of the pit with a small excavator and transport it with elevators. Pay attention to the scheme of digging holes with excavators.

5. The top-down method should contact the design institute and review the construction scheme and load according to the structural design.

In fact, I really want to know the positive solution of this problem. If you get good content from other sources, can you send it to me? In addition, I also require a design and construction drawing of the reverse method.