Method for performing construction operation on large-area ultra-soft soil site and steel frame system used by same

Abstract

The invention relates to a method for performing construction operation on a large-area ultra-soft soil site and a steel frame system used by same. The method comprises the following steps: 1) laying a layer of geotextile (3) on a construction site; 2) laying a layer of geo grid (2) on the laid geotextile (3); 3) laying a steel frame system (1) on the geo grid (2); and laying a layer of wood board (5) on the steel frame system (1) after the step 3). The method is suitable for the construction operation on the large-area ultra-soft soil site, and is particularly suitable for dredger fill and lately alluvial ultra-soft soil. The combination of the steel frame system and the geo grid and the geotextile enables the construction operation on the large-area ultra-soft soil site to become possible. The steel frame system comprises circular hollow steel pipes or hollow steel pipes of which the section has two semicircular sides and a rectangular middle, joints and joint translation limit rings; and the system can realize large-scale finished products, has simple laying mode and convenient and quick operation, can be recycled after the construction ends, and has the unique advantages of short construction period, low material consumption, economy and conservation, environmental protection and the like.

Description

technical field [0001] The invention relates to a construction method on a large-area ultra-soft soil site and a steel frame system used, and belongs to the transformation technology of the construction operation method on a large-area ultra-soft soil site and the steel frame system used. Background technique [0002] As our country stimulates the economy and expands domestic demand, a large number of infrastructure construction projects are launched. It is very common to reclaim land from the sea or blow mud from the sea for filling. This will face the difficulty of construction operations on ultra-soft soil sites. The ultra-soft soil site is generally a silt site. The untreated silt is in a flow-plastic shape, with high water content, large void ratio, and extremely low bearing capacity. Machinery cannot directly go up to perform related operations. At present, there are three methods for entering construction operations on flow-plastic silt soil: [0003] 1. Sand layer l...

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Problems solved by technology

[0005] (1) Drainage sand cushions need to be laid. Generally, medium-coarse sand with a mud content of less than 5% must be strictly used, and the thickness of the laying shall be 50cm to 100cm. In areas where the price of sand is low, it is still not feasible to use the sand filling operation method, because the ultra-soft soil has the characteristics of ultra-high water content, flow-plastic shape, and low permeability coefficient. When filling the ultra-soft soil site with medium-coarse sand, The construction cannot be continued due to the muddying of the site, and it is necessary to fill the site with sand after a long period of bleeding, so that the construction process is many, the process is complicated, and the construction period is long; when the processing site is located in an area where sand sources are scarce, even if the ultra-soft soil site is used for a long time Sand filling can be carried out after bleeding, but the cost will be greatly increased due to the high price of sand and the high cost of sand filling

[0006] (2) There are too many layers of geotextiles, and the consumables are large, and this laying method cannot fully utilize the friction between the geotextiles and the underlying silt

[0007] (3) The laying area of ​​the geotextile-sand layer method is as large as the site. When the site is relatively large, the sand source and its transportation will become problems, which will cause the extension of the construction period

[0011] The geotextile-bamboo sheet paving method also faces the problems of large consumables, difficult transportation, high price and non-recyclability, and the bamboo poles are non-rigid poles, so the effectiveness of spreading loads is not high

[0012] Due to the above-mentioned many disadvantages of the traditional method of construction on flow-plastic silt soil, it has long been unable to meet the needs of the existing national production, and it cannot be used on a large scale.

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