Manufacturing method of open caisson

Abstract

The invention discloses a manufacturing method of an open caisson. The method comprises construction preparation work, foundation pit excavation and sand cushion layer and plain concrete cushion layermanufacturing, foundation pit excavation and sand cushion layer and plain concrete cushion layer manufacturing, open caisson first, second and third section manufacturing, open caisson first sinking,open caisson fourth and fifth section manufacturing, and open caisson second sinking. The open caisson adopts a non-drainage sinking process, the soil taking mode is air mud suction diver matching, and the sinking aiding mode is sinking by a pressing sinking method and sinking aiding by thixotropic mud resistance reduction; and the method further comprises underwater plain concrete bottom sealingof the open caisson, manufacturing of an open caisson bottom plate, and pipeline buttress, blowoff chamber and finishing construction. A five-section manufacturing method and a secondary sinking construction method are adopted; the pouring compactness is convenient to control, the pouring operation difficulty is low, the technical requirement threshold is low, the construction efficiency is high,the quality is easy to control, the construction safety factor is high, and the engineering cost is effectively reduced.

Description

Technical field [0001] The invention relates to the technical field of caisson construction, in particular to a method for manufacturing a caisson. Background technique [0002] The sinking of the caisson mainly penetrates through the soil layers, which are plain fill layer, silt layer, silty clay layer, and silty sand layer. Among them, the silt layer and the silty clay layer have low strength, low permeability, high water content, high compressibility, high sensitivity, thixotropy and rheology. Compared with the silty sand layer, the silt layer and silty clay layer have greatly reduced shaft wall friction and bearing capacity. After the caisson sinks through the silty sand layer and enters the silty clay layer, undesirable phenomena such as inclination and sudden settlement of the caisson are prone to occur, which may cause greater disturbance to the external soil, and the structure is prone to uneven settlement and deformation , Cracking and other phenomena; at the same time...

AI Technical Summary

Problems solved by technology

After the caisson sinks through the silty sand layer and enters the silty clay layer, it is prone to the unfavorable phenomenon of caisson inclination and sudden settlement, which is likely to bring great disturbance to the external soil, and the structure is prone to uneven settlement and deformation , cracking and other phenomena; at the same time, the anti-uplift coefficient of the caisson is small, and the soil bin in the well cell will be uplifted to a certain extent during the sinking process

In conventional caisson construction, when a caisson with a large volume (generally more than 6m) drains and sinks, the soil around the well is prone to obvious deformation, and the ground has a large uneven settlement; Too much water and soil pressure difference inside and outside the well will be too large, and the plastic flow of the wellside and bottom soil will develop seriously, which will bring great difficulties to deviation correction and structural positioning; large-scale structures may also be damaged in a short period of time due to weak geological conditions with unknown internal causes. A large and rapid subsidence occurs due to the layer; when the subsidence is close to the design depth, it is difficult to control the subsidence, etc.

Conventional construction methods consume a lot of manpower and material resources, and have disadvantages such as long construction period, low construction efficiency, prone to quality accidents, and high cost

Images