Prestressed support for foundation pit and its construction method

Abstract

The invention discloses a prestress support used for a foundation pit. The prestress support comprises soil blocking and water stopping row piles which are arranged along the periphery of the foundation pit, an edge beam which is arranged along the soil blocking and water stopping row piles, at least one supporting assembly arranged along the edge beam and prestressed cables arranged corresponding to the supporting assemblies. Each supporting assembly comprises at least supporting rods connected to the edge beam, stand columns connected with the supporting rods, and connecting beams connecting the adjacent supporting beams. Prestressed cables corresponding to the supporting assemblies stretch across the supporting assemblies and are connected with the ends, located on the inner side of the foundation pit, of the supporting assemblies. The two ends of each prestressed cable are connected to the edge beam and exert prestress. According to the prestress support used for the foundation pit, stand columns are greatly reduced, the construction and detachment working amount for an inner support is reduced, due to the fact that the prestress support is only arranged along the periphery of the foundation pit, no inner support is arranged in the middle of the foundation pit, and earth cutting is greatly convenient.

Description

technical field [0001] The invention belongs to the field of civil engineering and construction engineering, and relates to foundation engineering, in particular to a prestressed support for foundation pits and a construction method thereof. Background technique [0002] At present, the internal support method is often used to solve the support problem of deep foundation pits in the foundation pit support project. The advantage of the internal support is that it is reliable in force, but the disadvantage is that it is expensive and requires a large investment. For large-scale foundation pits, not only internal support projects It is huge and requires a long construction time, and for multiple supports, due to the small vertical distance between each support, it makes it very difficult to excavate the earth. The excavator cannot directly load the earth on the car, and it needs to be poured several times. Digging is time-consuming and labor-intensive. In addition, during the c...

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Problems solved by technology

[0002] At present, the internal support method is often used to solve the support problem of deep foundation pits in the foundation pit support project. The advantage of the internal support is that it is reliable in force, but the disadvantage is that it is expensive and requires a large investment. For large-scale foundation pits, not only internal support projects It is huge and requires a long construction time, and for multiple supports, due to the small vertical distance between each support, it makes it very difficult to excavate the earth. The excavator cannot directly load the earth on the car, and it needs to be poured several times. Digging is time-consuming and labor-intensive. In addition, during the construction of the basement, the internal support needs to be removed, resulting in waste of materials and delays in the construction period.

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