A static pressure subsidence construction method of a prefabricated post-cast caisson

Abstract

The invention discloses a static pressure subsidence construction method for a prefabricated post-casting caisson, which comprises the following steps: setting a reaction frame around the periphery of the caisson; Piercing jack; the first caisson is assembled at the construction site, and anchor cables are pre-embedded in the well wall of the first caisson, so that the upper end of the anchor cable passes through the beam and the pull-up jack and is anchored to form a pull-up system; A sinking jack is set between the caisson and the beam to form a sinking system; the sinking system is used to realize the sinking of the first caisson, and the pull-up system is used to realize the speed control and attitude control during the sinking process of each caisson . The advantages of the present invention are: through the vertical sectioning and horizontal sectioning of the caisson, the well wall blocks can be prefabricated in the factory, shortening the construction period of the caisson; using the reaction frame to provide sinking force and The upper pulling force can effectively control the sinking speed and attitude of the caisson to avoid sudden sinking or tilting.

Description

technical field [0001] The invention relates to the technical field of caisson construction, in particular to a static pressure sinking construction method of a prefabricated and poured caisson. Background technique [0002] The caisson is a construction method for underground engineering and deep-buried foundations. With the development of modern construction technology and construction machinery, the caisson has gradually become a common type of enclosure structure for deep-buried underground structures, and it is economical and reasonable. , Simple structure, easy to guarantee engineering quality and other advantages, it is widely used in underground structures, foundations, foundation pit support and other projects. [0003] The sinking of the caisson mainly relies on its own weight to overcome the frictional resistance between the well wall and the soil and the resistance under the blade foot to sink to the design elevation. The choice of caisson sinking construction m...

AI Technical Summary

Problems solved by technology

However, the reaction force system adopted in the current caisson construction method generally requires a large construction site, and has a relatively large adverse effect on the surrounding environment and buildings during the construction process; in addition, site leveling at the caisson construction site is required, A lot of construction sites are reserved for caisson material stacking, steel bar processing, concrete mixing, etc., which is not conducive to the construction of caissons in areas with narrow sites and dense surrounding buildings

During the caisson construction process, the caisson must be poured on site, and the operation process is complicated. It is difficult to guarantee the quality of the caisson poured on site, and after pouring, it is necessary to wait for the strength of the caisson wall to meet the requirements before sinking the caisson, and the construction period is long.

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