Large-opening inverse trenching technology

Abstract

The invention supplies big opening backward practicing excavating technique. It includes the following steps: selecting unearthed cave mouth on the structure top plate; excavating. Its features are that the distance of the adjacent two borrow cave mouths is 20-40m; and their area is 600-700m2. The technique can increase excavating efficiency and speed, avoid earthwork transportation inconvenience caused by dark excavating plane, and shorten structure construction time for each construction block.

Description

technical field [0001] The invention relates to an upside-down method construction technology in current construction, in particular to a large-opening upside-down method excavation technology. Background technique [0002] Most of the unearthed and transported by the conventional upside-down method have the following characteristics: the total area of ​​the building foundation pit and the corresponding earthwork volume of the general upside-down method are not large. , combined with mechanical excavation and manual excavation, the purpose of engineering requirements can be achieved. [0003] According to the structural form of the first floor of the building, the excavation openings of the reverse construction method are arranged. Generally, the area of ​​the borrowing openings is small. When excavating, a special ventilation system must be erected, which brings many difficulties to the construction; the number of borrowing openings It is also less, resulting in a longer d...

AI Technical Summary

Problems solved by technology

[0003] According to the structural form of the first floor of the building, the excavation openings of the reverse construction method are arranged. Generally, the area of ​​the borrowing openings is small. When excavating, a special ventilation system must be erected, which brings many difficulties to the construction; the number of borrowing openings It is also less, resulting in a longer distance between the soil intakes, which increases the engineering volume of the second lightering and directly increases the project cost; and the first floor is generally not allowed to use large-scale construction transport vehicles and machinery, and the transportation must be carried out in various places. The operation surface is carried out, which greatly prolongs the construction period

[0004] Therefore, for projects with large foundation pit area and deep depth, high requirements on deformation control and structural quality, large layer height changes, fast excavation speed, and tight construction progress, the traditional reverse excavation construction technology cannot be applied