Construction method of domed square light caisson and pile foundation combined type deepwater breakwater

Abstract

The invention relates to a construction method of a domed square light caisson and pile foundation combined type deepwater breakwater. The breakwater comprises a caisson and a pile foundation, whereinthe caisson is a domed square caisson formed on the basis of pouring a combined steel template. The construction method comprises the steps that the combined steel template is utilized, the domed square caisson is poured in a layered and step-by-step mode and in the sequence of a bottom plate, a vertical plate and a rib plate, two upright wall parts and a dome part, wherein when the vertical plate and the rib plate are integrally prefabricated, a sleeve pipe is embedded in advance at the intersection part between the vertical plate and the rib plate, so that a mounting hole of the pile foundation is formed, and the pile foundation is prefabricated; water is injected into the caisson at the construction site through an opening of the dome part of the caisson, and the caisson is sunk and submersed to a designated position; the pile foundation is driven into a specified depth; and cement paste is injected the gap between the pile foundation and the pile foundation mounting hole wall. Theconstruction method has the advantages of being suitable for soft soil foundation and deep water conditions, the construction is convenient, the arrangement of a riprap foundation bed is not needed,the offshore operation time is short, and the caisson and the breakwater are capable of being repeatedly used.

Description

technical field [0001] The invention relates to a combination breakwater of a caisson and a pile foundation. Background technique [0002] Semicircular breakwater (such as: a kind of semicircular breakwater, publication number is CN 206736844 U) is a kind of novel light gravity type breakwater structure that adapts to soft soil foundation, and its main feature is that its top surface is a semicircular wave retaining structure , compared with the straight wall wave retaining structure, the wave force acting on the semicircular breakwater is smaller, and the anti-sliding stability is better; at the same time, the wave pressure acting on the semicircular embankment passes through the center of the circle, and the stress distribution of the foundation is relatively uniform, but its The arc radius is usually 4-10m, and the water depth range that the semicircular breakwater structure can adapt to is small; the square caisson breakwater (such as: a kind of open-hole caisson vertica...

AI Technical Summary

Problems solved by technology

[0002] Semicircular breakwater (such as: a kind of semicircular breakwater, publication number is CN 206736844 U) is a kind of novel light gravity type breakwater structure that adapts to soft soil foundation, and its main feature is that its top surface is a semicircular wave retaining structure , compared with the straight wall wave retaining structure, the wave force acting on the semicircular breakwater is smaller, and the anti-sliding stability is better; at the same time, the wave pressure acting on the semicircular embankment passes through the center of the circle, and the stress distribution of the foundation is relatively uniform, but its The arc radius is usually 4-10m, and the water depth range that the semicircular breakwater structure can adapt to is small; the square caisson breakwater (such as: a kind of open-hole caisson vertical breakwater, the publication number is CN 106592516 A) is a vertical breakwater, It can be used in deep water conditions, sand and gravel can be backfilled in the caisson, and the wave force can be resisted by its own weight. Because the wave force on the straight wall is large, the self-weight of the structure is also large, and the square caisson breakwater is usually not suitable for soft ground; the existing semicircular When constructing shaped or square caisson breakwaters, the walls are placed on the riprap foundation bed, because a large amount of stone needs to be mined to build the riprap foundation bed, and the mining of stone materials will destroy the ecological environment, and the setting of the riprap foundation bed not only increases the cost At the same time, it causes an additional burden to the bearing capacity of the foundation, and it is easy to cause the breakwater to sink and fail. In addition, the anti-sliding stability of both the semicircular caisson and the square caisson is provided by the friction between the bottom of the caisson and the top of the riprap foundation bed. Yes, when the water is deep and the waves are large, in order to maintain the anti-sliding stability of the breakwater, it is necessary to fill more sand and gravel in the caisson, resulting in an increase in the self-weight of the structure, thereby threatening the bearing capacity of the foundation. Therefore, the anti-sliding safety of the traditional caisson breakwater The increase of the factor reduces the safety factor of its vertical bearing capacity, thereby limiting the application of this structure in deep water breakwaters, and the construction time is increased due to rock-ripening operations

Images