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Combined grouting construction process of reinforcing foundation

A composite grouting and construction method technology, which is applied in basic structure engineering, soil protection, construction, etc., can solve the problems of easy loss of grout, large shrinkage of consolidated body, poor grouting effect, etc. The effect of large range and increased strength

Inactive Publication Date: 2004-04-07
GUANGDONG PROVINCIAL ACAD OF BUILDING RES GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the static pressure grouting technology to strengthen the foundation are: the controllability of the grouting grout is poor, and the phenomenon of grouting and grouting is easy to occur. Static pressure grouting can effectively control the scope of reinforcement. Chinese grouting technicians have developed sleeve valve pipe static pressure grouting method, but the controllability of depth has not been effectively solved.
[0009] The disadvantages of the high-pressure rotary jet grouting technology to strengthen the foundation are: when strengthening the foundation, the grouting slurry can only be consolidated within the limit range of the jet damage to the soil, and the diffusion range of the slurry is small, and it cannot be blocked by stones or hard objects. Reach the required range of reinforcement
At the same time, the grouting slurry is restricted by the jet fluidity, the water-cement ratio is relatively large, and the consolidation body shrinks greatly, so it is easy to be not tightly combined with the original foundation.
The grouting effect of high-pressure rotary jet grouting technology is poor for gravel foundation and humus soil containing large fibrous matter
[0010] Since the development of my country's construction industry, a large number of soft soil foundations need to be reinforced. At the same time, there are a large number of existing building foundations and new building pile foundations in my country that have quality problems and need to be reinforced. However, the above two types of grouting technologies have their inherent However, the range of strata and reinforcement objects used in foundation reinforcement is relatively small, and the reliability of grouting effect is relatively low, which cannot meet the engineering needs under various complex conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1. Project overview

[0041] The factory building of Shengcheng Leather Factory in Qingxi Town, Dongguan City is a double equal-span five-story frame structure with a construction area of ​​about 6,000 square meters. The project started construction in early 1993 and was completed at the end of the same year. Within one year after the completion of the project, it was found that the masonry of the brick wall was severely cracked, there were serious figure-eight cracks at the window corners of the outer wall, horizontal cracks appeared on the top of the window on the second floor, and the brick wall of the lower floor under the top beam of the toilet was detached. ①-②-B-C axis Severe longitudinal and transverse cracks appeared in the filling wall, so the project has not been delivered. Entrusted by the factory, the applicant used composite grouting to reinforce the foundation foundation of the factory building.

[0042] 2. The implementation of composite grouting reinf...

Embodiment 2

[0050] 1. Project overview:

[0051] The general factory building (B) of Shunde Sanzhou Real Estate Company is a four-story cast-in-place reinforced concrete frame structure, with a building height of 16.5m and a building area of ​​19280m2; area; set up three settlement joints. The project started on May 28, 1993 and was completed on May 23, 1994. In 1997, cracks appeared in the beams, slabs, columns, and outer walls of the factory building. From June to July 1997, the General Station of Quality and Safety Supervision and Inspection of Construction Projects of Guangdong Province appraised the quality of the factory building and submitted the "About the General Factory Building of Shunde Sanzhou Real Estate Company (B ) Technical Appraisal Opinions on Engineering Quality, the appraisal conclusion is: the reliability level of the plant is level four, that is, the reliability seriously does not meet the requirements of the current national standards and regulations, and it can n...

Embodiment 3

[0064] 1. Project overview

[0065] Agile Garden Buildings F19, F20, F21, F22, F23, F25, and F26 built by Zhongshan Agile Real Estate Corporation are located in Sanxiang Town, Zhongshan City. The foundations are drilled and punched cast-in-situ pile foundations, with pile diameters of 800mm, 1000mm and There are two kinds of 1200mm, the pile end is supported on slightly weathered granite, and the allowable bearing capacity of the designed single pile is 2200kN, 3500kN and 5000kN. After the pile foundation construction was completed, the Zhongshan Construction Engineering Quality Inspection Center inspected the pile foundation. All 238 engineering piles were tested by P.I.T. The test results are as follows: a total of 108 piles have weak soil layers or excessively thick sediment at the bottom of the piles, and the bottom of the piles has not reached the design bearing layer, and reinforcement treatment is required.

[0066] 2. The implementation of composite grouting reinforce...

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Abstract

The combined grouting construction process of reinforcing foundation includes the following steps: drilling grouting hole; establishing hole top grouting apparatus; high pressure rotary spraying clear water to expand hole; high pressure rotary spraying mortar and static pressure grouting. The present invention combines static pressure grouting technology and high pressure rotary spraying grouting technology with different advantages, so as to reach maximum application range, optimized reinforcing effect, and successive and safe reinforcement.

Description

Technical field [0001] The invention relates to the field of geotechnical engineering in the discipline of civil engineering, in particular to the technical field of reinforcing foundations. Background technique [0002] At present, the domestic and international grouting technologies for foundation reinforcement are mainly divided into two categories: static pressure grouting technology and high-pressure rotary jet grouting technology. [0003] 1. Static pressure grouting technology: The static pressure grouting technology uses the principles of hydraulic pressure, air pressure and electrochemistry to inject the strongly curable grout into the formation through the grouting pipe, and the grout can be filled, infiltrated, compacted and split. In other ways, the water and air in the soil particles or rock cracks are squeezed out to occupy their positions. After the slurry is consolidated, the original loose soil particles or cracks are cemented into a whole, thereby changing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D15/02E02D27/48
Inventor 韩金田刘洪波郭贱苟邓浩曹华先周新华杨平
Owner GUANGDONG PROVINCIAL ACAD OF BUILDING RES GRP CO LTD
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