Curing and backfilling construction method for waste mud of deep foundation pit building

Abstract

The invention discloses a curing and backfilling construction method for waste mud of a deep foundation pit building. The curing and backfilling construction method comprises the following steps that S1, the waste mud is conveyed to a backfilling construction site; s2, the waste slurry is pretreated, and the density ratio of the slurry to water is 1.4-1.6; s3, respectively conveying the pretreated slurry and a curing agent into a mechanical stirrer to obtain a mixture, and fully stirring and mixing the mixture to obtain a reinforcing material; wherein the curing agent comprises a mineral-based cementing material, and the mineral-based cementing material comprises an inorganic cementing material, cement and iron ore micro powder.

Description

technical field [0001] The present application relates to the technical field of construction, and more specifically, to a construction method for solidifying and backfilling construction waste mud of deep foundation pits. Background technique [0002] During the construction process, more and more underground projects use bored piles, underground diaphragm walls, shield tunneling and other construction techniques. These construction techniques will generate a large amount of waste mud, which will pollute the environmental soil and water quality. The traditional treatment method is to use tank trucks to pull the garbage to the centralized treatment site, and then let it dry naturally. As the requirements for environmental protection become higher and higher, the traditional treatment method is gradually eliminated. The new treatment method is to use a mud processor to dehydrate the mud, and after dehydration, it becomes solid mud and then transported. However, the treatment ...

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Problems solved by technology

As the requirements for environmental protection become higher and higher, the traditional treatment method is gradually eliminated. The new treatment method is to use a mud processor to dehydrate the mud, and after dehydration, it becomes solid mud and then transported. However, the treatment process is complicated and the cost is high.

[0003]As the land for urban construction becomes more and more tense, underground engineering gradually develops in a deep and large direction, and the construction time is required to be shorter and shorter. And the underground space is getting smaller and smaller, resulting in the backfill soil not being dense, which in turn affects the construction quality of the waterproof membrane outside the basement

In recent years, due to the failure of waterproofing in underground projects, water leakage has emerged in an endless stream, which has become a common quality problem. The backfill soil is not dense, causing subsidence and damage to buildings, pipelines, and access roads, and accidents that lose their use functions occur from time to time. It also brings harm to the seismic performance of high-rise buildings.

The technology of backfilling with plain soil or lime soil has been difficult to meet the actual engineering requirements. In order to ensure the quality of backfilling, plain concrete or foam concrete has to be used for backfilling. The cost of backfilling is high, and the strength of concrete also brings problems for later maintenance.

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