Close distance caisson group sinking construction method

Abstract

The invention discloses a close distance caisson group sinking construction method. The close distance caisson group sinking construction method comprises the following steps that the minimum horizontal clear distance a between adjacent caissons in the caisson group is determined; according to the active earth pressure theory, the soil sliding surface vertical depth h<1>is calculated when the soilis in the state of ultimate pressure and the horizontal width of the soil sliding surface is a; vertical load of the caisson self-weight is regarded as local additional load, the vertical stress of the caisson self-weight diffuses downwards, and the vertical depth h<2> of the vertical stress diffusing downwards at the horizontal clear distance a is calculated; the cutting edge safe height difference H between adjacent caissons in caisson group construction is determined, wherein H<min{h<1>, h<2>}; and the adjacent caissons in the caisson group sink alternately to complete caisson sink construction and bottom sealing construction, and the cutting edge height difference of the adjacent caissons is always kept in the range of the safe height difference H. According to the construction method, through reasonable sinking sequence selection, the maximum sinkage in each stage of the caisson is controlled, mutual influence of the caissons is significantly reduced, and successful sink of the caissons in the caisson group is guaranteed.

Description

technical field [0001] The invention relates to a caisson construction technology, in particular to a close-distance caisson group sinking construction method. Background technique [0002] Caissons are widely used in various projects in coastal areas, such as pipe jacking wells and bridge foundations. During the sinking process of the caisson, it is necessary to ensure that the caisson is vertical. Generally, caissons often appear in a single quantity in a small area, and the occurrence of two caissons is relatively rare. [0003] Three adjacent caissons appear in the same small area, which we call caisson group. In the construction of caisson group, the construction of each caisson may affect other caissons. Due to the relatively few projects involving caisson groups and the complex interaction between caisson groups, there is a lack of relevant research and construction experience at home and abroad. In a small number of projects involving caisson groups, mainly based...

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Problems solved by technology

[0004] Aiming at the lack of relevant research and construction experience in the construction of caisson groups at home and abroad, and the problems of easy caisson tilting accidents and low construction efficiency in engineering, the present invention provides a close-distance caisson group sinking construction method, which can avoid group Mutual interference between well groups ensures smooth sinking of all caissons in the caisson group

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