Construction method for backfilling of underground foundation pit excavation soil

A technology of backfilling and construction method, applied in filling, soil protection, infrastructure engineering and other directions, can solve the problems of high excavation and filling cost, long cycle, large excavation and filling transportation volume, etc., achieving good social and economic benefits and shortening excavation and filling. Filling time and cost, ensuring the effect of dense quality

Active Publication Date: 2015-10-07
NANTONG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The foundation pit is an earth pit excavated at the foundation design position according to the base elevation and foundation plane size. After the excavation of common underground deep foundation pits, the excavated soil needs to be transported away, and tamping and filling machines are used for backfilling. However, this method has a large amount of excavation and filling transportation, a long cycle, high cost of excavation and filling, and there are also problems such as uneven compaction quality of the backfill soil.

Method used

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  • Construction method for backfilling of underground foundation pit excavation soil

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Effect test

Embodiment 1

[0025] A construction method for backfilling excavated earth in an underground foundation pit. The method is to sort and accumulate temporary excavated earth on the ground near the deep foundation pit 1 on the site where the original deep foundation pit 1 was excavated, and then use the filling process to remove the excavated earth The soil is returned to the original deep foundation pit 1 in the form of mud. During the backfilling process, the backfilled soil is compacted by drainage, and the same layer of soil is balanced and regulated, so that it is backfilled layer by layer until the floor elevation controlled by the design So far; the specific steps of the backfill construction method are as follows:

[0026] The first step is to select the excavated soil storage site: select several temporary excavated soil storage sites 2 near the deep foundation pit 1;

[0027] The second step, excavation and excavation soil stacking: excavation of deep foundation pit earthwork, excava...

Embodiment 2

[0033] In this embodiment, on the basis of Example 1, when the excavation soil storage site 2 is selected in the first step, the excavation soil storage site is arranged at the diagonal of the deep foundation pit 1, thereby shortening the conveying distance of the mud and improving the filling efficiency; In addition, in order to ensure that the excavated soil is not easy to collapse, the excavated soil can be piled up to a height of 3-4m.

Embodiment 3

[0035] In this embodiment, on the basis of Embodiment 1, when the backfill system is preset in the third part, the mud conveying pipeline 6 adopts a rubber mud pipe with a diameter of Φ120, and the part of the mud conveying pipeline 6 located on the cement road should be equipped with The plate frame 8 protected by planks strengthens the protection of the mud delivery pipeline 6 and prolongs the service life of the mud delivery pipeline 6 .

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Abstract

The invention relates to a construction method for backfilling of underground foundation pit excavation soil. According to the method, on a site of original deep foundation pit excavation, the temporary excavation soil is stacked on the ground nearby a deep foundation pit in a sorted mode, then a filling technology is adopted for returning the excavation soil into the original deep foundation pit in a slurry mode, in the backfilling process, soil is made compact after backfilling through drainage, balanced matching and appropriate regulation and control of the same layer of soil are achieved, and in this way, backfilling is performed in a layer-by-layer mode until a design control ground elevation is reached. The construction method has the advantages that in backfilling of the underground foundation pit excavation soil, excavation and filling time of the deep foundation pit can be greatly shortened, excavation and filling costs of the deep foundation pit can be greatly lowered, and backfill resetting can be rapidly guaranteed without ramming machines.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for backfilling excavated earth in an underground foundation pit. Background technique [0002] The foundation pit is an earth pit excavated at the foundation design position according to the base elevation and foundation plane size. After the excavation of common underground deep foundation pits, the excavated soil needs to be transported away, and tamping and filling machines are used for backfilling. However, this method has the problems of large excavation and filling transportation volume, long period, high cost of excavation and filling, and uneven compaction quality of backfill soil. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method of backfilling excavated soil in underground foundation pits that can greatly shorten the time period and cost of excavating and filling deep founda...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/18E02D3/10
Inventor 韩选江张志余张爱国陈建陆海阳
Owner NANTONG INST OF TECH
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