Sand-bed-free vacuum preloading and water bag heaped loading combined reinforcing device and method for soft soil foundation

Abstract

The invention discloses a sand-bed-free vacuum preloading and water bag heaped loading combined reinforcing device for a soft soil foundation. The device comprises plastic drainage plates vertically instead into the soft soil foundation, a first non-woven geotechnical cloth layer laid on the surface of the soft soil foundation, water-permeable hoses flatly laid on the first non-woven geotechnical cloth layer and peripherally covered with medium sand, plastic drainage plates connected to the water-permeable hoses, a vacuumizing device connected to the water-permeable hoses, a second non-woven geotechnical cloth layer laid on the plastic drainage plates, a sealing film laid on the second non-woven geotechnical cloth layer, a third non-woven geotechnical cloth layer laid on the sealing film, and a covering piece placed on the sealing film. According to the sand-bed-free vacuum preloading and water bag heaped loading combined reinforcing device and method for the soft soil foundation, a sand bed can be omitted, the construction speed can be increased, and construction cost can be reduced; and in addition, water bag loading is used for replacing filling loading, and the reinforcing effect of a vacuum preloading method can be further improved in regions with limited filling resources.

Description

technical field [0001] A construction auxiliary device, in particular a soft ground reinforcement device and method. Background technique [0002] With the acceleration of my country's modernization process, a large number of soft soil foundations need to be dealt with during the construction of coastal cities. Among them, the vacuum-surcharge combined preloading method is one of the commonly used treatment methods, which is developed on the basis of the vacuum preloading method and the surcharged preloading method. [0003] The vacuum preloading method uses atmospheric preloading as the load. Now lay a layer of drainage sand cushion on the ground, and then use a punching machine to insert plastic drainage boards according to the designed spacing, and then cover one to two layers of airtight sealing film on it. , and then use a vacuum pump to keep the permeable material at a high degree of vacuum, generating negative pore water pressure in the pore water of the soil, and th...

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Problems solved by technology

[0005] The vacuum-surcharge combined preloading method can quickly load after the vacuum degree reaches the design value, and the effect is better than that of simple vacuum preloading and surcharge preloading. However, the traditional vacuum-surcharge combined preloading method requires a sand cushion. Generally, it is necessary to use medium-coarse sand with a mud content of less than 5%, and the laying thickness is about 50cm; this increases the construction cost and reduces the construction efficiency

In addition, in our country, there are fewer and fewer filling resources, and it is often difficult to find filling resources, so we have to only carry out vacuum preloading, and sometimes need to carry out secondary treatment after vacuum preloading, resulting in a large waste

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