Construction method of foundation reinforcement structure of soft soil overlaying construction waste dump

Abstract

Disclosed is a construction method of a foundation reinforcement structure of a soft soil overlaying construction waste dump to ensure construction quality of reinforcement piles and reinforcement foundations and enable the foundation reinforcement structure of the soft soil overlaying construction waste dump to be effectively implemented. The structure is constructed according to the following steps: carrying out column hammer punching on a foundation to the top of a foundation soft soil layer by using a column hammer machine; inserting vertical steel bars into the foundation soft soil layerat intervals on the circumference of column hammer holes; mixing a concrete mixed material; placing deep and long gunny bags from ground to the column hammer holes with the bottom parts being placed on the top surface of the foundation soft soil layer; filling the deep and long gunny bags with the concrete mixed material in layers, and carrying out light tamping in layers by using the column hammer until the concrete mixed material is pressed into the bottom of the soft soil foundation under the restriction of the deep and long gunny bags; filling the deep and long gunny bags with an upper tamping filler in layers, and tamping the filler by using a low-energy column hammer; filling the deep and long gunny bags with the upper tamping filler in layers, and increasing column hammer tamping energy level by level in layers until to the design height of the surface of the foundation; and laying a cushion layer on the reinforcement foundation, and constructing filling work in layers.

Description

technical field [0001] The invention relates to geotechnical engineering, in particular to a construction method for a foundation reinforcement structure of a construction waste site covered with soft soil. Background technique [0002] There are a large number of soft soil foundations distributed in coastal areas. When the soft soil foundation is used as a construction waste site and needs to be reused, this complex foundation needs to be reinforced. In engineering practice, there are cases of using bored piles for reinforcement. The existing problem is that the project investment is huge, and it is difficult for other single foundation reinforcement treatment methods to effectively deal with this complex foundation. [0003] The applicant disclosed in the patent specification ZL201110056535.7 a patent specification for a construction waste site covered with soft soil. The foundation includes an underlying hard soil layer, a soft soil layer, a construction waste layer and a...

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Problems solved by technology

[0002] There are a large number of soft soil foundations distributed in coastal areas. When the soft soil foundation is used as a construction waste site and needs to be reused, this complex foundation needs to be reinforced. In engineering practice, there are cases of using bored piles for reinforcement. The problem is that the project investment is huge, and it is difficult for other single foundation reinforcement treatment methods to effectively deal with this complex foundation.

[0004] The above-mentioned invention patent proposes to deal with the construction waste on the soft soil, but it does not involve a suitable construction method, especially how to implement the proposed concrete mixture pile in the soft soil layer is the key to the application of the present invention, because It is difficult for traditional granular materials to form piles in soft soil. In this invention patent, concrete mixture is used. Although concrete mixture is added with concrete materials, it is difficult to form an effective pile in soft soil due to its low restraint. , and is easily polluted by soft soil and even cannot form piles

In addition, under the small constraints of soft soil, the concrete mixture is easy to spread, so the amount of concrete mixture that needs to be filled is greatly increased, and its economic efficiency becomes inconspicuous or even uneconomical.

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