A new installation technology of large diameter deeply-buried caissons …
2022年7月1日 · In pneumatic caisson-sinking method, the working chamber air pressure can be controlled to balance the external hydrostatic pressure and stabilize weak floor strata, thus soil can be excavated in a dry chamber. In this method, a shaft structure can be progressively sunk in a controlled manner in low strength soils (Dhinian, 2003). However, both ...
Caisson (engineering) - Wikipedia
A caisson is sunk by self-weight, concrete or water ballast placed on top, or by hydraulic jacks. The leading edge (or cutting shoe) of the caisson is sloped out at a sharp angle to aid sinking in a vertical manner; it is usually made of steel.
Monitoring the construction of a large-diameter caisson in sand
2020年12月16日 · Large-diameter open caissons are a widely used construction solution for deep foundations, underground storage and attenuation tanks, pumping stations, and launch and reception shafts for tunnel boring machines. The sinking phase presents a number of challenges during construction, including maintaining caisson verticality, controlling the rate ...
Real-Time Monitoring of Large-Diameter Caissons
2018年8月3日 · Large-diameter open caissons are a widely-adopted solution for deep foundations, underground storage and attenuation tanks, pumping stations, and launch and reception shafts for tunnel boring machines. The sinking process presents a number of challenges including maintaining verticality of the caisson, controlling the rate of sinking, and ...
Active control method for the sinking of open caissons: A data …
2022年8月1日 · This paper proposes a key index of open caisson sinking, the sinking by earth excavation index (SEI). Then, a time series prediction model of SEI based on convolutional neural network (CNN) was established, and an active control method with a data-driven strategy was proposed based on this model.
Sinking a caisson tunnel in soft soil is new idea and this new concept could be an alternative method of tunneling in soft soil. This caisson tunneling method is proposed to reduce the use of temporary works such as propping of sheet pile walls and …
Examples of open caisson sinking in Scotland | Proceedings of …
2009年2月1日 · Open caisson-sinking techniques permit a shaft structure to be progressively sunk, either under its own weight or with the aid of caisson jacks, in a controlled manner from the surface to a predetermined depth. The technique is suited to shaft construction through weak soils, high- to extremely high-plasticity clays, silts, and sands and ...
Caisson Method - SpringerLink
2022年12月27日 · When the caisson needs to sink, open the pipeline valve in turn according to the pressure required by the construction, and the pressure is ejected from the jet hole and diffuses up along the periphery of the wellbore to form an air curtain to reduce the surrounding friction resistance and promote the wellbore to sink (Fig. 2). This method can ...
Deep Shaft Excavation: Design, Construction, and Their Challenges
2022年2月28日 · The sinking circular concrete caisson method requires highly skilled machine operators to ensure smooth sinking process. Unfavorable sinking procedure causing tilt will lead to damaged concrete walls or even misalignment of the shaft.
Caisson and shaft construction - Tunnels
2016年3月14日 · Caisson sinking typically involves constructing the first one or two rings of the shaft at ground level within a substantial reinforced concrete collar using a special cutting ring at the leading edge.