Backfill compaction method in narrow area of ​​foundation pit

Abstract

The invention discloses a backfill compacting method of a narrow region of a foundation pit, aiming at achieving backfill material compactness required by design and specification and improving the backfilling efficiency of the foundation pit. The backfill compacting method of the narrow region of the foundation pit provided by the invention comprises the following steps of arranging an irrigation and drainage system, paving the backfill material, irrigating and permeating, and vibrating by using a vibrating spear. Compared with the prior art, the backfill compacting method of the narrow region of the foundation pit provided by the invention is characterized in that the insertion type vibrating spear is capable of going deep into the backfill material for vibrating, so that the thickness of each single layer of the backfill material can be greatly increased and can be in the range from 1.0 m to 1.5m, the construction efficiency is greatly improved, and the backfill quality is effectively controlled by the method of increasing vibrating times and reducing the space between vibrating points; the backfill compacting method has the advantages of convenience in construction, short construction period, high efficiency and easy guarantee of quality.

Description

technical field [0001] The invention relates to a building construction method, in particular to a method for backfilling and compacting building foundation pits. Background technique [0002] Due to the shortage of urban land resources and the rapid rise of high-rise buildings, building foundation pits are getting deeper and deeper, and building buildings with 2 to 3 floors of basements are commonplace. Restricted by the construction site, the backfilling space of the foundation pit is narrow, which limits the use of large machinery and equipment, and brings unprecedented difficulties to the backfilling of the foundation pit. Therefore, there have been a lot of backfill quality problems such as obvious settlement after backfilling of the foundation pit, cracking, hollowing, and subsidence of the outdoor floor, which have seriously affected the beauty of the surrounding environment of the building, and have also caused deformation of buried underground pipelines in some back...

AI Technical Summary

Problems solved by technology

Due to the limitation of the construction site, the backfilling space of the foundation pit is narrow, which limits the use of large machinery and equipment, and brings unprecedented difficulties to the backfilling of the foundation pit

Therefore, there have been a lot of backfill quality problems such as obvious settlement after backfilling of the foundation pit, cracking, hollowing, and subsidence of the outdoor floor, which have seriously affected the beauty of the surrounding environment of the building, and have also caused deformation of buried underground pipelines in some backfill areas. broken problem

[0003] The foundation pit backfilling method in the prior art usually adopts compaction or tamping construction technology. The technology or specification requires layered backfill materials, layered compaction (or tamping), layered detection, and the thickness of each layer is 0.2m~0.3m , when the layer thickness is too large, the required degree of compaction cannot be achieved, therefore, the backfill efficiency is very low

When the depth of the foundation pit is large and the working space is narrow, it is difficult to achieve the technically required layered backfill material and layered compaction, and the backfill material cannot reach the 94% compaction degree required by the usual design

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