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Method for calking exploratory hole by intermittent high-pressure rotary jet grouting

A high-pressure rotary spraying and grouting technology, which is applied in the fields of soil protection, construction, and infrastructure engineering, etc., can solve problems such as difficulty in ensuring the quality of plugging, and achieve the effect of saving engineering cost, low cost, and ensuring plugging quality

Inactive Publication Date: 2011-05-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of clay ball backfilling technology is that the construction is simple and convenient, and the cost is low; the disadvantage is that the plugging quality is often difficult to guarantee

Method used

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  • Method for calking exploratory hole by intermittent high-pressure rotary jet grouting
  • Method for calking exploratory hole by intermittent high-pressure rotary jet grouting
  • Method for calking exploratory hole by intermittent high-pressure rotary jet grouting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The foundation pit project of a subway station is 190.0m long and 20.7m wide. It is constructed by the open cut method. The supporting structure is ground connection wall and inner support. The depth of the foundation pit is 14.070m. Five survey holes were left in the pit, and the survey holes revealed the silt confined aquifer at the bottom of the pit at 5-7m. The water head of the confined aquifer is buried at a depth of about 1m, which poses a risk of inrush for the excavation of the foundation pit. Poorly sealed survey holes are the safety weak points that cause inrush accidents in foundation pit engineering. In order to eliminate the potential safety hazards in inrush, 5 survey holes in the pit were re-sealed before the design of precipitation. According to the geotechnical engineering investigation report, it is judged that there is a confined aquifer with a thickness of about 2-4m below the pit bottom 5-7m, so the high-pressure rotary jet grouting reinforcement te...

Embodiment 2

[0025] The excavation area of ​​a large-scale transportation hub foundation pit project is 20,000 m 2 , the excavation depth is 32.5m, and the construction is carried out by cover-excavation method. The preliminary engineering survey needs to leave 23 exploration holes in the excavation range of the foundation pit. These holes will connect various aquifers within the excavation range of the foundation pit, which will pose a potential threat to the safety of the foundation pit project, and the project uses It is extremely difficult to take emergency remedial measures in the event of a sudden dangerous situation due to the construction method of cover and excavation. After the exploration work of the exploratory hole is completed, the top of the two silt confined aquifers at the buried depth of 41-45m and 21-24m respectively and the bottom of the foundation pit at the buried depth of 32.5m exposed by the exploratory hole shall be reinforced by high-pressure jet grouting Three d...

Embodiment 3

[0027] A foundation pit project has a depth of 12.6m and an excavation area of ​​15,000m 2, using the open-cut method, threatened by the inrush of a silt confined aquifer that is widely distributed below the pit bottom 7m and about 3m thick, 5 of the 18 survey holes in the pit have serious hole collapse at the bottom of the pit. The length of the collapsed hole ranges from 1 to 2 meters. For each survey hole that has not collapsed, three disk-shaped reinforcements with a diameter of 2.0m and a height of 0.3m are formed at a depth of 19 meters by using high-pressure jet grouting reinforcement technology, and the distance between the disk-shaped reinforcements is 2.0 meters. The remaining space in the hole is backfilled with air-dried clay balls with a diameter of 23mm and compacted in layers. For the five reconnaissance holes where collapsed holes occurred, a short column with a diameter of 2.0 m and a height of 1.5 m was formed between the top and bottom of the collapsed posi...

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Abstract

The invention discloses a method for calking an exploratory hole by intermittent high-pressure rotary jet grouting, which comprises the following steps: (a) determining the depth of the exploratory hole, the soil quality and the thickness of various soil layers of the exploratory hole, and the groundwater level burial depth; (b) determining the position of confined aquifer and the position with severe collapse in the exploratory hole as reinforced regions, and taking the position positioned outside the reinforced regions in the exploratory hole as a backfill air-drying clay mud ball region; and (c) treating the reinforced regions and the backfill air-drying clay mud ball region determined in the step (b) from the bottom to the top of the exploratory hole respectively until the exploratoryhole is calked to the ground surface. The method adopts rotary jet grouting on confined aquifer roof plates exposed by the exploratory hole and the regions with severe collapse and still adopts a calking method of clay ball backfill compaction in other regions, so that the method can guarantee the calking quality, avoid the water burst phenomenon, and greatly save the engineering manufacturing cost.

Description

technical field [0001] The invention relates to a method for plugging survey holes or other holes in the stratum, in particular to a method of forming interval grouting short columns by high-pressure rotary jet grouting to seal the survey holes in the stratum, which is suitable for surveying the existence of strata. When there are holes or other geological defects, plugging measures need to be taken to prevent engineering accidents such as hole collapse or water gushing. It can be mainly used in the field of foundation pit engineering, and other fields such as tunnel engineering and foundation treatment engineering. Background technique [0002] With the development of construction projects in the two directions of "high building height and deep foundation burial", the construction depth of underground engineering such as foundation pit engineering is increasing day by day, often involving the confined aquifer below the underground aquifer, facing inrush, quicksand , Piping ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12E02D19/16
Inventor 郑刚杨建民
Owner TIANJIN UNIV
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