Caisson structure and method for smoothly and accurately sinking caisson structure into earth surface

Abstract

The invention provides a well sinking structure, which comprises a closed shaft wall, wherein the shaft wall is provided with inner wall surfaces and outer wall surfaces which are opposite to the inner wall surfaces; a plurality of frame beams which are mutually staggered inside the horizontal surface and the vertical surface and underframe beams which are close to the lowest end of the shaft wall are arranged between the inner wall surfaces; a plurality of constant-height inner supporting blocks are formed on the inner wall surfaces; a plurality of constant-height outer supporting blocks are arranged on the outer wall surfaces; the outer supporting blocks are higher than the inner supporting blocks; bottom surfaces of the underframe beams are planes which are provided with no shoe; and a shoe provided with a bevel is formed on the lowest end of the shaft wall. The invention simultaneously provides a method for accurately settling down the well sinking structure into the ground. The method can accurately guarantee gradual settlement of a sinking well by the controllable method, and is accurate in final settlement, so as to avoid significant safety and quality accidents such as sudden settlement, super-settlement, off-centering, plane revolution, vertical inclined settlement, deformation and fracture, water inflow inside a well and sinking outside the well in the prior construction method.

Description

technical field [0001] The invention relates to a building structure and a construction method, in particular to a caisson structure and a construction method for stably sinking the caisson structure into the ground and finally sinking accurately. Background technique [0002] As a structure for underground space structures or deep foundations of high-rise buildings or deep foundation pit support construction, caissons have their unique scope of engineering application conditions. For example, generally under good hard soil geological conditions, caisson technology may not be used, but it is more convenient and economical to use other foundation pit construction techniques. However, in soft soil areas, due to the loose soil and poor stability, the use of general foundation pit support structures will lead to high support costs, and at the same time lead to a longer construction period. In addition, the risk of construction is also greater. [0003] Therefore, caissons are w...

AI Technical Summary

Problems solved by technology

However, caissons are constructed and applied under soft soil foundation conditions. If the design and construction operations are improper, sudden settlement, over-sinking, center deviation, plane rotation, vertical skew settlement, deformation and fracture, earth gushing in the well, and subsidence outside the well are prone to occur. Major safety and quality accidents

This is mainly caused by the inherent insufficiency of the vertical plane stiffness (or the minimum vertical section torsional stiffness) of some parts of the caisson (such as the diagonal of the rectangular caisson); it is also due to the current structure of the caisson and the corresponding construction The method cannot guarantee the smooth sinking and accurate final sinking of the caisson in the engineering sense.

Therefore, in the actual construction process, most of the caissons are swaying and sinking unsteadily, and construction dangers are very easy to occur. The difficulty of construction increases, the construction period is extended, and the cost continues to rise

The disadvantages of these traditional technologies are technical problems that need to be solved for a long time but have not been solved in caisson construction.

[0004] Using the caisson construction method to carry out the construction of foundation pit support is one of the research directions in the engineering field, but at present the largest caisson can only meet the construction of small and medium-sized foundation pits

However, it is extremely difficult in the engineering field to make caissons with larger plane areas, larger circular diameters or larger rectangular unilateral lengths, larger inner grid sizes, and more complex special-shaped and asymmetrical planar shapes.

This is determined by the lack of rigidity of the caisson itself and the characteristics that it cannot sink smoothly and accurately, which limits the development speed of the caisson towards a larger area, more complex plane, and more economical cost. Limits the expansion of the use of caissons; this is also a long-standing problem in the design and application of caissons

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