Classification of reverse practice in foundation pit engineering:1Full reverse approach The floor of each layer of the underground structure is used to form a horizontal support for the surrounding ground wall, and then the earth is excavated under it, and the building materials are excavated and transported into the cavity reserved on the floor. 2Partial reverse method (conjunctive method) In engineering practice, according to different requirements, we can adopt the main building first as skirt building and then reverse, skirt building first as main building and then reverse, center as peripheral reverse and so on, which become partial reverse.
Before the foundation pit was dug,First along the basement of the buildingExterior wallOr surrounding construction of underground diaphragm wall(used as a parapet) Or other supporting structures at the same timeinIntermediate supporting piles and columns are poured or laid at relevant locations inside the building to support the dead weight and construction load of the superstructure before the bottom sealing during construction. Then construction of the first floor of the beam and plate floor structure,As a support structure to bear the dead weight and construction load of the superstructure during construction , and then excavate the earth layer by layer and pour the underground structure of each layer until the bottom sealing of the floor. At the same time, because the ground floor structure has been completed, creating conditions for the construction of the superstructure, so the construction of the ground structure can be carried out at the same time. In this way, the construction above and below the ground is carried out at the same time until the end of the project.
Foundation pit engineeringThere are many different construction types of reverse construction, which can be divided into the following types according to the degree of using the underground main structure:
1Full reverse approach
The floor of each layer of the underground structure is used to form a horizontal support for the surrounding ground wall, and then the earth is excavated under it, and the building materials are excavated and transported into the cavity reserved on the floor.
2Partial reverse method (conjunctive method)
In engineering practice, according to different requirements, we can adopt the main building first as skirt building and then reverse, skirt building first as main building and then reverse, center as peripheral reverse and so on, which become partial reverse.
3, up and down the synchronous construction of the reverse approach
This construction method is to carry out the construction of the above ground main structure simultaneously with the downward inverse construction of the underground main structure.
The reverse method is also known as cover digging method, cover digging method is also the first construction of retaining piles, walls and other peripheral supporting structure, and then the first set of horizontal structure plate on the surface, the foundation pit sealed, so that the ground traffic can be restored in a short time. After the ground is sealed by cover digging, the lower construction can still adopt different construction schemes such as cover digging in advance or cover digging in reverse.
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