Direct local skirt border reversing construction for central island

Abstract

A job practice of which center island is done in sequence and partial skirts done inversely, comprising the following steps : set up exterior-protected construction, purlin and steel upright columns around the foundation ditch; dig on basin pattern for the first time to the depths to structural plane of purlin, earthwork are unified dig beneath the designed to the surrounding medium plate in the foundation ditch, pour the surrounding medium plate; dig for the second time with basin pattern downwards from the position of foundation ditch medium plate to the bottom of the designed foundation ditch, pour the center island plate; after the center island plate meets the maintenance time request of plate, construct in sequence to close the medium plate, setting fetching holes; then use medium plate for support system, construct criss-cross structural upper plate and plates in inverse zones. This construction method is convenient, save labor force and resources, improves the progress of the project, shorten the construction period.

Description

technical field [0001] The invention relates to the construction technology of the semi-inverted construction method in the current construction, in particular to a construction method in which the central island is built along the side and the partial skirt is reversed. Background technique [0002] The reverse method that emerged in the 1980s is to excavate a section of earthwork downward after the surrounding enclosure, that is, the underground diaphragm wall, and then use the false corbel method to pour the concrete structure of this section, and then proceed downwards sequentially. Construction method up to the bottom. In the top-down construction process, due to the gentle soil surface, the elevation of the soil surface under the structure is generally consistent with the bottom surface of the structural beams and slabs, that is, the construction of each layer of the structure using the soil membrane method does not require the support of bent frames. [0003] This tr...

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Problems solved by technology

[0003] This traditional construction method is generally used in housing construction. The basement floor height is generally not high, and the foundation pit area is small, generally 6000m 2 Left and right, when carrying out construction, first of all, according to the structural form of the first floor of the building, the layout of the soil-borrowing hole in the reverse construction method is carried out. Generally, the area of ​​the soil-borrowing hole is small and the number of holes is small, which leads to the distance between the holes. Large, about 60-70m, so the amount of excavation of underground earthwork during construction is relatively large, the amount of secondary transfer of earthwork is also large, and the progress of the project is slow

Moreover, this kind of excavation structure is not conducive to natural ventilation. In general, it is necessary to use multiple exhaust fans and set up a dedicated ventilation system, which reduces the limited construction operation space, brings inconvenience to the entire construction process, and directly increases engineering cost

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

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