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Contaminated foundation pit supporting and rapid excavation construction method

A construction method and foundation pit support technology, applied in the field of civil engineering, can solve the problems of long repair time, short repair period, complicated procedures, etc., and achieve the effects of safe and reliable construction process, low investment and operating costs, and simple construction steps.

Active Publication Date: 2021-09-07
葛洲坝生态建设(湖北)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the remediation methods of heavy metal contaminated sites mainly include burial, phytoremediation, bioremediation, soil leaching, solidification and stabilization, and various integrated remediation technologies. Soil cover, although the method is simple to operate, it occupies land, is prone to leakage and pollutes the surrounding environment, and transfers the pollution to the landfill. Phytoremediation and bioremediation technologies mainly fix heavy metal pollutants in plants or organisms, and then reuse them Various separation techniques to extract heavy metals This method is only used for the treatment of agricultural contaminated soil, it is difficult to improve the strength of the foundation soil, and is affected by the growth cycle of plants or organisms, the restoration time is long, so it is not suitable for the restoration of urban industrial contaminated sites;
[0003] Contaminated site remediation technology can be divided into in-situ remediation technology and ex-situ remediation technology according to the remediation site. The in-situ remediation technology does not move the contaminated soil, and directly repairs the contaminated site on the spot, which has the characteristics of good effect and small secondary pollution; The in-situ remediation technology is to excavate the polluted soil and treat it in situ or after transportation. The repair period is short and the repair effect is more controllable than in-situ remediation. However, it is easy to cause secondary pollution during the excavation process. For large areas polluted soil, the cost of excavation and transportation is high;
[0004] In the Chinese invention patent application CN108746171A, this application mainly solves the existing excavation process, the process is relatively complicated, and the problem of high cost, but in the actual excavation process, no foundation pit support is added, resulting in excavation process, There are certain security risks;
[0005] In the Chinese invention patent application CN101773928A, the application discloses a treatment method for in-situ solidification and isolation of heavy metal industrial polluted sites, but this method only solidifies the pollutants in the soil inside the polluted site without changing its state or shape. As a result, there is still a greater risk of pollution;

Method used

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  • Contaminated foundation pit supporting and rapid excavation construction method
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  • Contaminated foundation pit supporting and rapid excavation construction method

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Experimental program
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Embodiment 1

[0043] see figure 1 , a polluted foundation pit support and rapid excavation construction method, comprising

[0044] Step 1: Before the excavation of the polluted foundation pit, clean up the surrounding area of ​​the polluted foundation pit, level the site, clean up the mud on the construction site, and then measure and stake out the construction site; divide the polluted foundation pit into the first work area, the second work area and the third work area;

[0045] Step 2: Set up a water retaining wall around the polluted foundation pit, which is formed by concrete pouring and arranged along the entire length of the perimeter of the polluted foundation pit; the water retaining wall formed by concrete pouring is 30cm high and 10cm thick; the polluted foundation pit is surrounded by drainage ditches Arrange a 1m by 1m by 1m water collection well every 50cm; and set a 0.3 by 0.3m intercepting ditch on the top of the polluted foundation pit at least 3m away from the excavation ...

Embodiment 2

[0053] see figure 2 , a polluted foundation pit support and rapid excavation construction method. Preferably, the soil nails are cement mortar soil nails, mainly using 16mm third-grade hot-rolled steel bars and M30 cement mortar for full-length soil nails. The construction method of inserting soil nails after grouting; prying off the pumice on the slope, cleaning the rock surface, and arranging the drilling positions; the mortar soil nails with a soil nail length less than 6m are drilled with a YT-28 hand-pneumatic drill , install soil nails after grouting; if the length of soil nails is greater than 6m, use YG80 guide rail rock drill to drill, install soil nails first and then grout; after drilling, wash the hole with high-pressure air and water, and drain the water blow out.

[0054] Among them, the permanent support soil nails that are grouted first are inserted into the soil nails immediately after the grout is filled in the borehole; the permanent support soil nails tha...

Embodiment 3

[0056] see image 3 , a polluted foundation pit support and rapid excavation construction method, preferably, in step 5, the first work area and the second work area, in the excavation process, firstly carry out the pollution boundary and the excavation boundary measurement and setting out, and then carry out multi-layer When excavating polluted soil, during the excavation process, excavation is carried out while supporting, and the excavation method adopts vertical layering, longitudinal segmentation, and branching along with excavation; after the upper layer of contaminated soil is excavated, the next layer of polluted soil The HDPE membrane is laid on the soil surface to separate, and the surrounding soil is cleaned during excavation, and the soil is tested and supported on the slope and pit wall;

[0057] The third industrial area is a heavily polluted area. First, the heavily polluted area will be closed with Larsen steel piles around it, and no excavation will be perform...

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Abstract

The invention discloses a contaminated foundation pit supporting and rapid excavation construction method. The contaminated foundation pit supporting and rapid excavation construction method comprises the steps that 1, before a contaminated foundation pit is excavated, the periphery of the contaminated foundation pit is cleaned, a site is leveled, slurry on a construction site is cleaned up, and then the construction site is subjected to surveying and setting out; and the contaminated foundation pit is divided into a first work area, a second work area and a third work area; 2, a water retaining wall is arranged on the periphery of the contaminated foundation pit, is formed through concrete pouring and is arranged along the periphery of the contaminated foundation pit in a full-length manner; and 3, in the excavation process of the foundation pit, pit wall soil of the foundation pit in the first work area, the second work area and the third work area is detected, the first work area is a heavy metal contaminated foundation pit, and the second work area is an organic contaminated foundation pit. The problems that an existing contaminated foundation pit excavation method is low in safety and low in excavation speed, the pit wall of the foundation pit cannot be detected, a reasonable construction method is formulated according to the soil contamination condition, the construction period is increased invisibly, and the construction efficiency is reduced are solved.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a polluted foundation pit support and rapid excavation construction method. Background technique [0002] At present, the remediation methods of heavy metal contaminated sites mainly include burial, phytoremediation, bioremediation, soil leaching, solidification and stabilization, and various integrated remediation technologies. Soil cover, although the method is simple to operate, it occupies land, is prone to leakage and pollutes the surrounding environment, and transfers the pollution to the landfill. Phytoremediation and bioremediation technologies mainly fix heavy metal pollutants in plants or organisms, and then reuse them Various separation techniques to extract heavy metals This method is only used for the treatment of agricultural contaminated soil, it is difficult to improve the strength of the foundation soil, and is affected by the growth cycle of plants or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04E02D5/04E02D5/76E02D15/02E02D1/00E02D33/00
CPCE02D17/02E02D17/04E02D5/04E02D5/76E02D15/02E02D1/00E02D33/00
Inventor 叶聪刘波庭陈鹏刘毅孙志伍燕超杰朱天乐
Owner 葛洲坝生态建设(湖北)有限公司