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Introduction To Non-cushion Sand Layer Vacuum Preloading Method

The method relates to a large area soft ground treatment method, in particular to a vacuum preloading method without a drainage sand layer. 

Non-cushion sand layer it includes the following main steps: 

1) laying drainage plates on the treatment site according to the plum pile type; 

2) arranging the horizontal drainage system to replace the medium coarse sand cushion used in the previous vacuum preloading construction, two kinds of laying can be used One of the ways; 

3) Connect the main pipe of the horizontal drainage system to the vacuuming device, and then vacuum the construction after filming. 

The vacuum preloading method for the non-drained sand cushion of the invention is suitable for the reinforcement of large-area soft soil foundation, especially for the dredger fill and the newly deposited ultra-soft soil, and the utility model saves a large investment of laying the sand cushion layer. The vacuum transmission effect is good, and the horizontal drainage system of the wire spring tube + tube plate connector + drainage plate can realize large-scale finished product and normalized construction, and the laying time is short, and can be recycled and reused. The construction period is short and the unique advantage of economic saving.

The main purpose of the dredging projects

The main purpose of the dredging project is to excavate the harbor basin, the inbound waterway, etc., to fill the land to build the dock, the port area and the port industrial zone, the coastal city land and recreational land and land reclamation, the shore beach maintenance, the water conservancy and flood control and the reservoir area. Improvement of water environment such as dredging, rivers, lakes and seas, ecological restoration, construction and landfill of various underwater pipelines. The role of dredging projects in human social progress, environmental improvement and economic development is very important.

Use dredging methods to dig shallow sections of deep rivers or bays to improve navigation or flood discharge capacity; an economically viable primary method of landfilling dredged soils in excavation channels or harbor basins into nearby low-lying areas for land reclamation . 

Dredging has traditionally been treated in a manner that is abandoned or dumped in the waters adjacent to the project. The dredging project has created a new way of turning waste into treasure and comprehensively processing it, and then developed it into the use of dredged soil as building materials and materials for building buildings. The dredging project is also extended to excavate the bottom of the river or the bottom of the sea to bury the river or cross-sea pipeline (water pipes, oil pipes, transmission cables, communication cables, etc.); remove the sand and stone for hydraulic engineering with strong underwater displacement capacity. Material foundation and soft ground improvement; blowing sand to protect the beach and so on.

In the past few decades, human beings have increasingly demanded environmental standards. Preventing and reducing the pollution of waters and land by dredging activities has become an important issue that must be considered in dredging projects. Dredging methods are used to excavate underwater contaminated soils and carry out engineering. Processing has also become an important part of dredging projects.

What is Dredging and Its Application

Dredging is to dredge, widen or dig deep waters such as deep rivers and lakes, and use manmade power or machinery to carry out underwater earthwork or excavation works.

The generalized dredging includes the reef and the fried beach, which are carried out by the blasting method under water. A small river that is constructed by artificially breaking the flow. Various dredgers are widely used in mechanical construction, and onshore construction machinery such as rope shovel is sometimes used.

About the dreging history, the mechanical dredging began in 1600, and the prototype of the chain bucket dredger appeared in the construction of the port of Rotterdam, the Netherlands. China began construction of dredgers in the Huangpu River in 1889. In 1929, the Jiangnan Shipyard caused a chain bucket dredger. In the early 1980s, China had an annual capacity of about 300 million cubic meters of mechanical dredging.

Dredging works are widely used: 1, to excavate new waterways, ports and canals. 2, Deep, widen and clean up existing waterways and ports. 3, dredge the rivers, channels, and dredging of the reservoir. 4, Excavation of foundation pits for hydraulic structures such as docks, docks and ship locks. 5, Combine dredging to carry out landfilling, reclamation and other projects. 6, Clear underwater obstacles.