Construction method for managing underground mined-out area or cavity

A construction method and goaf technology, which are applied in mining equipment, earthwork drilling, filling and other directions, can solve the problems of low filling saturation, complexity and high cost

Active Publication Date: 2012-03-21
刘清洁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of grouting is large, the construction period is long, and the cost is high
In addition, due to the complexity of underground mined-out areas or cavities and low filling saturation, it is difficult to achieve the effect of ensuring that mined-out areas or cavities do not collapse
Hidden dangers ambush for ground engineering construction
Especially for railway and highway projects, often the area of ​​underground mined-out area or cavity is large, and the purpose of reinforcement along the subgrade line cannot be achieved by using the grouting scheme

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The general situation of this embodiment is: a power plant is proposed to be built, and it is found during the geological survey that the ground is a goaf formed by manual coal excavation. Weakly weathered rock formation, 10-20m. The height of the cavity formed by coal mining is 3-6m, and the area of ​​the goaf is 1500m×300m=450,000m 2 , the volume of the mined-out cavity is about 1.57 million cubic meters, and the water height in the cave is 1.0-1.5m. If the grouting scheme is adopted, the estimated cost is 390 million yuan, and the construction period is one year. Now the construction method of the present invention is adopted, and the final account cost is 80 million yuan , and the construction period is three months.

[0021] The concrete implementation method of embodiment one is:

[0022] First, drill holes from the ground until the top surface of the hole is drilled, and the diameter of the hole is 150mm;

[0023] Second, a steel pipe with a length of 7m and a...

Embodiment 2

[0026] The overview of this embodiment is: there are 8 residential buildings in a residential area, with 30 floors above the ground and one floor underground, and the floor area of ​​each building is 840m2 2 , each building is designed with 178 perforated piles with a diameter of Φ700 and a pile length of 12m. The geological situation is as follows: ①silty clay layer with an average thickness of 8m at the bottom of the foundation pit; ②strongly weathered rock layer with an average thickness of 2m; ③Medium weathered and weakly weathered rock formation with an average thickness of 10m. ④The lower part is a cavity with a height of 2-7m. The underground cavity area is about 80,000 square meters, and the cavity volume is about 480,000 cubic meters. If the overall cavity grouting scheme is adopted, Its cost is about 120 million yuan, which is not feasible for this project. After adopting the construction method of the present invention, its design scheme is to arrange a concrete cir...

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PUM

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Abstract

The invention discloses a construction method for managing an underground mined-out area or a cavity, which comprises the following steps of: firstly, drilling a hole from the ground till drilling through the top surface of the mined-out area or the cavity; secondly, putting a steel pipe into the drilled hole with vertical traction of a rope till the bottom of the mined-out area or the cavity; and finally, pouring concrete layer by layer from the drilled hole, namely pouring the concrete to the bottom of the mined-out area or the cavity layer by layer through the steel pipe in the drilled hole till a concrete cone rises to the top surface of the mined-out area or the cavity. The arrangement of the concrete cone can greatly reduce the filling amount of the filler, save the cost and shorten the construction period; and the reinforced effect is greatly superior to that of the grouting scheme in the prior art.

Description

technical field [0001] The invention relates to a construction method for controlling underground goafs or cavities, that is, constructing a concrete circular platform in the underground goafs or cavities to support the top of the gobs or cavities, which can effectively prevent the gobs or cavities from collapsing, Cause damage to structures on the ground. Background technique [0002] With the continuous development of industrial and civil buildings, railways, and highways, the proposed site often encounters underground goafs or cavities, which brings hidden dangers to the construction of ground buildings. Because the underground is gobs or cavities, ground subsidence often occurs Already built structures wreak havoc. Railway and highway construction also often encounter underground mined-out areas or cavities. In the prior art, the treatment of underground mined-out areas or cavities generally adopts a grouting scheme or for small-volume cavities, an integral cavity pour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F15/00
Inventor 刘清洁
Owner 刘清洁
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