Grouting combined prestressed anchor rod static pressure pile rectification and reinforcement method

An anchor static pressure pile and prestressing technology, applied in the field of correction and reinforcement, can solve the problems of long time, high load requirements, unsatisfactory correction effect, etc., and achieve the effect of small quantity, technical feasibility and short consolidation time

Active Publication Date: 2017-03-22
GUANGZHOU CHEM GROUTING CO LTD CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solidification of grout made of inorganic materials such as cement takes a long time. Once the grouting stops, the building will sink again as the excess pore pressure dissipates.
Therefore, the traditional method of pressure grouting to

Method used

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  • Grouting combined prestressed anchor rod static pressure pile rectification and reinforcement method
  • Grouting combined prestressed anchor rod static pressure pile rectification and reinforcement method
  • Grouting combined prestressed anchor rod static pressure pile rectification and reinforcement method

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Embodiment 1

[0039] Such as figure 1 As shown, the present invention discloses a deflection correction and strengthening method for grouting combined with prestressed anchor static pressure piles. Pile 1.

[0040] Grouting lifts the building using a special cement-based composite chemical grouting material, which is poured into the foundation soil through the grouting pipe to form excess pore pressure in the foundation soil. Due to the three-dimensional stress state of the soil, the foundation soil will deform upwards, and the building Under the action of the excess pore pressure of the foundation soil, it also rises upwards. The special cement-based composite chemical grouting material can be solidified in about 15s, and has a certain degree of expansion, which is beneficial to lift the building, but the time for the consolidated body to form strength is about 4h to 6h, and the time for the consolidated body to form strength Before, once the grouting is stopped, the excess pore pressure...

Embodiment 2

[0057] Such as Figure 1 to Figure 4 As shown, the specific implementation process of the deviation correction reinforcement method provided by the present invention is as follows:

[0058] 1. Construction preparation

[0059] 1) Before construction, the location of the largest settlement and the direction of inclination should be determined according to the building deformation appraisal report, and the best location for chemical grouting and anchor static pressure pile 1 should be determined. Pile placement and grouting at the position where the settlement is large and the settlement deformation rate is the largest can achieve the effect of four or two.

[0060] 2) Before construction, pay attention to investigate the pipeline conditions around the building, and take protective measures to avoid pipeline damage or blockage caused by grouting during grouting.

[0061] 2. Construction of anchor static pressure pile 1

[0062] 1) Holes are drilled around the foundation of th...

Embodiment 3

[0075] Regarding the cement-based composite chemical grouting material provided by the present invention, the grouting material mainly includes cement, early-strength agent and water glass; wherein the main agent is cement, and the early-strength agent and cement of 1% of the cement weight are mixed in by weight percentage 20% of the weight of water glass is compounded, and the water glass is based on 45 Baume degrees, that is, when 1 ton of cement is used, 10kg of early strength agent and 200kg of water glass need to be mixed.

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Abstract

The invention discloses a grouting combined prestressed anchor rod static pressure pile rectification and reinforcement method. Firstly, the maximum settling position and the inclined direction of a building are determined; grouting holes are excavated; prestressed anchor rod static pressure piles are arranged; prestress devices are mounted on the static pressure piles; the building is connected with the static pressure piles through the prestress devices; then, cement base composite chemical grouting materials are mixed; the grouting materials are filled in a foundation through grouting pipes, and generate the excess pore pressure in the grouting holes to upwards deform soil of the foundation; the building is upwards hoisted under the effect of the excess pore pressure of the soil of the foundation; finally, proper prestress is applied to the static pressure piles, so that the building is suffered from upward support force to stop settling after grouting; and after grouting material induration forms strength, the next grouting operation can be performed. The rectification and reinforcement method has the advantages of simple operation, low risk, safety, reliability and capability of effectively slowing down dissipation of the excess pore pressure.

Description

technical field [0001] The invention relates to the technical field of deviation correction and reinforcement of existing building structures, in particular to a method for correcting deviation and strengthening of building structures by using grouting combined with prestressed anchor static pressure piles. Background technique [0002] With the acceleration of urban construction and development, more and more engineering projects are carried out in urban construction-intensive areas. Carrying out engineering construction projects in densely built urban areas, especially foundation pit engineering, can easily cause impacts such as settlement and inclination on surrounding buildings where the engineering project is located. [0003] Due to the settlement and inclination of surrounding houses and buildings caused by engineering construction, the original buildings must be rectified and reinforced. [0004] Among the traditional construction techniques for building reinforceme...

Claims

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Application Information

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IPC IPC(8): E02D35/00
CPCE02D35/00
Inventor 薛炜古伟斌张文超胡文东李世添杨元龙曹建胜于方
Owner GUANGZHOU CHEM GROUTING CO LTD CAS
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