Construction method for penetrating through goaf deep pile foundation
A construction method and goaf technology, applied in the direction of foundation structure engineering, drilling equipment and methods, sheet pile walls, etc., can solve the problems of reducing investment, etc., and achieve the goals of accelerating construction progress, saving construction time, and fast hole formation Effect
Inactive Publication Date: 2017-01-18
NANCHANG RAILWAY ENG CO LTD OF CHINA RAILWAY 24TH BUREAU GRP CO LTD +1
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Problems solved by technology
[0005] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a kind of construction method of crossing the deep pile foundation of mined-out area, "the combined construction of rotary drilling and percussion drill" solves the construction problem of deep pile foundation of bridge in mined-out area, not only The progress of the project is guaranteed, the investment is reduced, the construction risk is greatly reduced, and the quality of the project is guaranteed
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example 1
[0041] Example 1: During the construction of the pile foundation of the Libi Bridge of Yangzuo Expressway in Shanxi Province, the above method was used for the construction of the goaf section. The Libi Bridge is a 19-span simply supported girder bridge. The substructure is pile-column type, and the pile foundation is as deep as more than 60 meters. The main reason is that there are many goafs encountered during the process, and the pile foundation has been lengthened many times. During the construction of the goaf section It has a great impact on the overall construction progress. After research, it is decided to use Ux percussion drill and rotary drill for construction, which saves construction time and achieves good results.
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The invention discloses a construction method for penetrating through a goaf deep pile foundation. During construction above a goaf roof covering layer, rapid construction is carried out by means of the characteristics of high hole forming speed and quality of rotary drilling, rotary drilling is controlled by a computer, a drilled hole can be accurately positioned, the hole verticality and drilling depth are automatically calibrated, and the drilling quality is guaranteed to the maximum extent. When a goaf roof is drilled, the goaf roof is constructed through a Wukas impact drill, the coal seam roof can be broken through rapidly by means of the gravitational potential energy of a punch hammer, the overturn accident caused by rising speed of drilling through the goaf roof in a rotary cutting mode is prevented, the construction time is shortened, and the risk in the construction process is lowered.
Description
technical field [0001] The invention relates to a construction method for a deep pile foundation passing through a goaf, and belongs to the field of pile foundation construction. Background technique [0002] With the increase of highway construction mileage in our country, there are more and more bridges crossing goafs in mountainous highways. When bridge pile foundations are located in multi-layer goafs, underground coal mining roadways and goafs are inevitable. Unfavorable factors such as subsidence and caving will be encountered during the pile foundation construction process. If the construction method is improper during construction, it will bring unexpected and disastrous consequences. [0003] Today’s pile foundation construction adopts a single construction method, such as rotary drilling, impact drilling and other mechanical holes. It is difficult to construct when encountering coal seam roadways in goaf areas. If the quality is poor, it will lead to drilling fail...
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IPC IPC(8): E02D5/36E21B7/00E21F15/00
CPCE02D5/36E02D2300/002E21B7/00E21F15/00
Inventor 张岳王均龙中皇刘占中赵君君
Owner NANCHANG RAILWAY ENG CO LTD OF CHINA RAILWAY 24TH BUREAU GRP CO LTD
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