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A remote sea calcareous sand dredging microbial weak cementation device and its construction method

A microbial and weak cementation technology, applied in fertilization devices, chemical instruments and methods, water filling and land building, etc., can solve problems such as high maintenance costs of artificial islands, dredging filling of calcareous sand, loss of fine particles of calcareous sand, etc., to achieve The effect of short training period for workers, simple construction method and low construction cost

Active Publication Date: 2020-09-15
重庆大学建筑规划设计研究总院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of expanding reefs and islands, the current dredging filling technology directly fills the calcareous sand into the shoal without treating the dredging and filling calcareous sand. On the one hand, it causes a large loss of fine particles in the calcareous sand. On the one hand, calcareous sand has no cementation after dredging, and its strength is low, which usually causes a large number of engineering problems in the dredged foundation, mainly including foundation stability and foundation settlement.
This makes artificial islands expensive to maintain

Method used

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  • A remote sea calcareous sand dredging microbial weak cementation device and its construction method
  • A remote sea calcareous sand dredging microbial weak cementation device and its construction method
  • A remote sea calcareous sand dredging microbial weak cementation device and its construction method

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Effect test

Embodiment 1

[0040]In the South China Sea, calcareous sand is mainly used to fill reefs and expand reefs to build islands. This embodiment discloses an open-sea calcareous sand dredging microbial weak cementation device. During the calcareous sand dredging process, the dredged calcareous sand is preliminarily treated to make the calcareous sand produce weak cementation during the dredging process, which can improve The strength and erosion resistance of dredger calcareous sand.

[0041] see figure 1 and image 3 , The distant sea calcareous sand dredging microbial weak cementation device includes dredging equipment and dredging equipment. A first mud bin 2, a second mud bin 3, a third mud bin 4 and microbial treatment equipment are arranged on the hull 1. The first mud bin 2, the second mud bin 3 and the third mud bin 4 are respectively used to store calcareous sand with different treatment degrees.

[0042] A mud-water separation device is installed in the first mud bin 2 . The mate...

Embodiment 2

[0053] This embodiment discloses a construction method of the offshore calcareous sand dredging microbial weak cementation device described in Embodiment 1, which includes the following steps:

[0054] 1) The distant sea calcareous sand dredging microbial weak cementation device is arranged in place, and side anchors are thrown to fix the ship's position.

[0055] 2) Lower the dredging equipment to the seabed.

[0056] 3) Excavate and absorb the seabed calcareous sand, and transport it to the first mud bin 2 for storage. Until the sandy soil is collected in this area.

[0057] 4) Move to the next area, fix the ship's position again, and repeat step 3).

[0058] 5) The first mud bin 2 separates the absorbed calcareous sand from the seawater.

[0059] 6) Take the calcareous sand to be mixed in the dry treatment of the first mud bin 2, and test the specific gravity Gs and average bulk density of the calcareous sand ρ And average water content w, calculate the average porosity...

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Abstract

The invention provides an offshore calcareous sand hydraulic reclamation microorganism weak cementing device and a construction method thereof. According to the device, one sludge bin in a traditionaldredger is added into three sludge bins, and microorganism treatment equipment is added among the sludge bins and comprises a CaCl2 solution preparation device, a microorganism culture and storage device, a urea solution preparation device and a stirring tank. Calcium sand extracted from sea is sequentially mixed with a CaCl2 solution, a microbial culture solution and a urea solution; urea hydrolysis is promoted by using microorganisms to generate CO2, CO2 generates CO3<2+> when meeting water, and the CO3<2+> reacts with Ca<2+> in a cementing solution to generate CaCO3 precipitate for cementing the sand. In addition, after sand is blown and filled, the Ca<2+> in the seawater is continuously promoted to precipitate by the microorganisms, so that the effect of continuously reinforcing the side slope is achieved. The cementing degree of the hydraulic reclamation calcium sand can be enhanced, the strength of the hydraulic reclamation sandy soil is improved, and then bank slope stability and the anti-scouring capacity are improved. The method is simple in construction, convenient to implement and small in influence on the environment, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of water conservancy engineering, in particular to a microbiological weak cementation device for offshore calcareous sand dredging. Background technique [0002] The South China Sea is an important part of China's territory, with rich fishery resources, waterway resources and oil and gas resources. The development and utilization of various resources in the South China Sea is of great significance to my country's economic development and energy strategic plan. In addition, the South China Sea is an important channel connecting my country to the Maritime Silk Road, and an important channel to strengthen my country's connection with Central and South Asian countries and African countries. [0003] The South China Sea is a vast area, spanning about 2,000 kilometers from north to south and 1,000 kilometers from east to west, with a total area of ​​about 2.5 million square kilometers. This shows that the distan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02B3/18E02F3/92C09K17/40C09K103/00
Inventor 马国梁肖杨何想肖鹏汪洋
Owner 重庆大学建筑规划设计研究总院有限公司