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Method for performing freezing-method well drilling by building permanent derrick foundation in frozen circle

A technology of freezing circle and freezing method, which is applied in well sinking, shaft equipment, mining equipment, etc., can solve the problems of insurmountable influence of derrick, large amount of steel consumption, and difficult design, so as to shorten the loan repayment time, reduce the construction period, The effect of saving steel consumption

Inactive Publication Date: 2010-03-03
中煤科工集团沈阳设计研究院有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

This kind of derrick consumes a lot of steel, occupies a large area, has complex loads, and is difficult to design. Moreover, some derrick foundations are still affected by freeze-thaw deformation, especially the impact of ground subsidence caused by deep well freezing on the derrick cannot be overcome.

Method used

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  • Method for performing freezing-method well drilling by building permanent derrick foundation in frozen circle
  • Method for performing freezing-method well drilling by building permanent derrick foundation in frozen circle

Examples

Experimental program
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Embodiment Construction

[0010] 1. Calibrate the well position;

[0011] 2. Lower the freezing tube;

[0012] 3. The foundation of the permanent derrick 1 is constructed into a round platform (its longitudinal section is in an inverted convex shape) foundation 3, so that the frozen pipe 4 is located at the outer eaves of the platform. The foundation of the derrick is 2.5m deep, the inner diameter of the foundation is 4.7m, and the outer diameter is 10.1m.

[0013] 4. Construct the permanent derrick foundation in the freezing circle into an inverted circular platform (its longitudinal section is in an inverted convex shape) foundation, so that the frozen pipe is located in the circular platform foundation. With the gradual formation of the double-layer well wall, the derrick load is naturally transferred to the well wall superior. Between the derrick and the ground foundation there are diagonal braces 2 that are hinged to the foundation, and the diagonal braces generate a large horizontal thrust on t...

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Abstract

The invention provides a method for performing freezing-method well drilling by building a permanent derrick foundation in a frozen circle and solves a problem that derricks used in the prior freezing-method well drilling method of building a derrick first, then lowering a freezing pipe and finally digging a well in the frozen circle are all four-batter post frame type derricks that use a large amount of steel and occupy large areas. The key points of the method include: lowering the freezing pipe at a well position; and building a permanent derrick foundation into a foundation in an invertedcone frustum shape in the frozen circle, placing the freezing pipe in the cone-frustum foundation, mounting the permanent derrick on the inverted cone-frustum foundation, performing freezing to form the frozen circle and drilling a well by using the permanent derrick. The method has the advantages of saving land, saving steel by more than ten tons compared with the method which uses the four-batter post frame type derrick, reducing well drilling construction period, ensuring early coal output, reducing loan repayment time and increasing the economic benefits of mines.

Description

technical field [0001] The invention relates to a method for setting a coal mining permanent derrick in a freezing circle to drill a well by freezing method. Background technique [0002] The method of carrying out freezing method sinking well at present is, at first set up derrick, secondly lower freezing pipe, finally drill well in freezing circle. Said derrick all adopts the frame type derrick of four inclined columns, and the foundation of the derrick is arranged on the non-frozen soil layer in the outer circle of the frozen circle. This kind of derrick consumes a lot of steel, covers a large area, has complex loads, and is difficult to design. Moreover, some derrick foundations are still affected by freeze-thaw deformation, especially the impact of ground subsidence caused by deep well freezing on the derrick cannot be overcome. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D1/14
Inventor 郭连生张俊
Owner 中煤科工集团沈阳设计研究院有限公司
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