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Method for correcting incline of deep layer drill silt squeezing and soil discharging

A building and building settlement technology, applied in construction, infrastructure engineering, etc., can solve the problems of difficulty in forming radiation wells, large soil porosity, large compression deformation, etc., and achieve obvious economic and social benefits. Thorough, low-impact effect on the environment

Active Publication Date: 2010-08-11
CHINA CONSTR SIXTH ENG DIV CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the characteristics of large porosity, large compression deformation, and large thixotropy of the soil in coastal soft soil areas, the current rectification methods include shallow soil excavation method, radiation well jetting water method, precipitation rectification method, etc., among which shallow excavation Inclination rectification by method is easy to cause structural deformation or damage to inclined buildings (structures) with poor overall rigidity; rectification by radiation well jetting water is more difficult and expensive to complete wells in areas with high surface water level; rectification by precipitation The effect of the foundation with poor water permeability is not good, and it is easy to cause large settlement on the inclined side, and the controllability is not high

Method used

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  • Method for correcting incline of deep layer drill silt squeezing and soil discharging
  • Method for correcting incline of deep layer drill silt squeezing and soil discharging
  • Method for correcting incline of deep layer drill silt squeezing and soil discharging

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The main structure of a residential building is a six-storey brick-concrete structure with a total building height of 16.8m and a building area of ​​3860m 2 , with a total length of 58.4m and a width of 10.4m, the foundation is C20 reinforced concrete strip foundation, the external wall foundation is buried at -1.65m, and the foundation is a 300mm thick stone chip cushion. Under the cushion is a soft plastic silty clay layer, the groundwater depth is -1.5m, and between -5 and 10.6m below the foundation is a highly compressed clay and silty clay soft plastic soil layer.

[0019] Observation: The building tilts 178mm to the north on average, with a tilt rate of 10.6‰, which is far greater than the specification and needs to be rectified. Adopt the present invention to carry out rectification construction to it, concrete operation is as follows:

[0020] (1) Preparatory work: Do a good job of fencing the site to prevent unrelated personnel from entering the site to interf...

Embodiment 2

[0029] A residential building was completed and put into use in December 1998. The main structure is a six-story brick-concrete structure. The total height of the building is 17.5m, the total length is 39.6m, and the width is 14.1m. The foundation is a 350mm thick reinforced concrete raft foundation. The burial depth is -1.7m, the foundation is a 100mm thick plain concrete cushion, the 500mm diameter and 10m long powder-sprayed pile composite foundation is under the cushion, the groundwater depth is -1.0m, and the height is between -5 and 10.6m below the foundation Compressed clay and silty clay soft plastic layer.

[0030]Observation: The building leans northwards by an average of 142-170 mm, with a slope rate of 8.11-9.71‰, which is far greater than the specification; the observation shows that the building is still settling, and the value of the slope is also slowly increasing, and it needs to be corrected. Adopt the inventive method to carry out rectification construction ...

Embodiment 3

[0040] An office building in Tianjin Tanggu Marine High-tech Development Zone, the building is 28.8m long, 11.7m wide and 4.5m high. The foundation is a C20 reinforced concrete raft foundation with a thickness of 250mm, and the lower part of the foundation is a C7.5 plain concrete cushion with a thickness of 100mm, and the natural foundation below it. During the decoration of the building, it was found that the maximum difference in ground elevation in the long direction (north-south direction) was 148mm. Through further observations, the building was inclined to the south at the same time, and the average inclination rate was 5.82‰. The southward inclination rate has exceeded the maximum allowable inclination value stipulated in the code. 4‰ and the slope rate is still increasing. In order to ensure the safety of the structure and reduce losses, it is necessary to rectify it in time.

[0041] Adopt the inventive method to carry out rectification construction to it, concrete ...

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Abstract

The invention discloses a method for rectifying building inclination through deep borehole silt displacement and mud removal, which comprises the following steps: (1) arranging boreholes according to the inclination condition and the structural type of a building; (2) performing jump hole boring at intervals along the arranged positions of the boreholes from the ground; and (3) discharging silt of an underlying soft soil layer in each borehole until the inclination of the inclined building tilts back to a preset inclination value. After adopting the method for rectifying building inclination,the foundation earth at the softer side can be effectively protected without destabilizing the building, even the destabilization exists, the destabilization is very low; moreover, because the borehole-cleaning operation is scattered relatively, and only deep layer soft soil is dug out, the underlay and the soil layer in certain depth below the foundation cannot be destabilized and play a role ofa protective layer for adjusting the foundation pressure; and once the inclination rectification construction is finished, the building settlement can be stable very soon.

Description

technical field [0001] The invention relates to a method for rectifying the inclination of buildings (structures), in particular to a method for rectifying the inclination of buildings (structures) by squeezing silt and discharging mud through deep drilling. Background technique [0002] Most coastal areas in my country belong to soft soil areas, with large soil porosity, large compression deformation, large changes in foundation soil thickness, and large differences in buried depth. Under the influence of various factors such as survey, design, construction, and use, it is easy to cause construction. ) buildings produce large uneven settlement, resulting in excessive inclination of buildings (structures). For the inclined building, if it is not treated and continues to be used for a long time, it will endanger the safety of the building structure and the safety of personal life; if it is abandoned, it will waste a lot and occupy a lot of land; if it is demolished and rebuilt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D35/00
Inventor 王存贵张新民张立敏
Owner CHINA CONSTR SIXTH ENG DIV CORP
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