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Chemical grouting material for surface pre-grouting

A chemical grouting material and pre-grouting technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of chemical grouting materials with many components, low operation safety, limited space, etc., and achieve easy Regulatory control, good penetration performance, and easy-to-operate effects

Inactive Publication Date: 2012-04-18
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical grouting materials are generally low or slightly toxic. During underground construction, due to limited space, they will cause harm to the operator's body
Chemical grouting materials have many components, and there are prominent problems such as complex procedures, harsh operating environment, high labor intensity and low operational safety when used underground.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1. Under the test conditions of 25°C, in a urea-formaldehyde resin solution with a solid content of 40%, 3 g of toughening agent NN'-methylenebisacrylamide and 57 g of acrylamide were added, mixed and stirred evenly, and used The urea-formaldehyde resin solution with a solid content of 40% was fixed to 500ml to prepare a 500ml slurry; 3g of oxalic acid with a purity of 90% and 5g of ammonium persulfate as a strengthening agent were added to water and stirred evenly to prepare a 500ml solution. The slurry of the present invention can be obtained by mixing and stirring the two slurries (liquids) at a volume ratio of 1:1. According to the basic properties and test methods of grouting materials and grout in "Anchor and Grouting Technology", the measured viscosity of the grout is 0.013Pa·s, the gel time is 49 minutes, and the 28-day compressive strength of the grout stone is 2.16MPa.

Embodiment 2

[0010] Example 2: Under the test conditions of 25°C, in urea-formaldehyde resin with a solid content of 45%, 3.75 g of toughening agent NN'-methylenebisacrylamide and 71.25 g of acrylamide were added, mixed and stirred evenly, Dilute 500ml of urea-formaldehyde resin solution with a solid content of 45% to prepare a 500ml slurry; take 4.5g of oxalic acid with a purity of 90% and 6.5g of the enhancer ammonium persulfate, add them to water and stir evenly, and prepare a 500ml solution. The slurry of the present invention can be obtained by mixing and stirring the above two slurries (liquids) evenly. According to the basic properties and test methods of grouting materials and grout in "Anchor and Grouting Technology", the measured viscosity of the grout is 0.014Pa·s, the gel time is 23 minutes, and the 28-day compressive strength of the grout stone is 2.78MPa.

Embodiment 3

[0011] Example 3: Under the test conditions of 25°C, in urea-formaldehyde resin with a solid content of 50%, 4.5 g of toughening agent NN'-methylenebisacrylamide and 85.5 g of acrylamide were added, mixed and stirred evenly, Dilute 500ml of urea-formaldehyde resin solution with a solid content of 50% to prepare a 500ml slurry; take 6g of oxalic acid with a purity of 90% and 8g of the enhancer ammonium persulfate, add them to water and stir evenly, and prepare a 500ml solution. The slurry of the present invention can be obtained by mixing and stirring the above two slurries (liquids) evenly. According to the basic properties and test methods of grouting materials and grout in "Anchor and Grouting Technology", the measured viscosity of the grout is 0.015Pa·s, the gel time is 11 minutes, and the 28-day compressive strength of the grout stone is 3.25MPa.

[0012] The degree of polymerization of the urea-formaldehyde resin in the above examples is 50-70, provided by Shandong Weifan...

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Abstract

The invention discloses a chemical grouting material for surface pre-grouting, which is prepared from solution A and solution B according to a volume ratio of 1:1, wherein the solution A consists of urea resin with solid content between 40 and 50 percent, a toughening agent NN'-methylenebisacrylamide and a formaldehyde elimination agent acrylamide; the toughening agent and the formaldehyde elimination agent are added into the urea resin, the total concentration of the toughening agent and the formaldehyde elimination agent is between 120 and 180g / L, and the concentration ratio of the toughening agent to the formaldehyde elimination agent is 1:19; and the solution B consists of a reinforcing agent ammoniumpersulfate, oxalic acid and solvent water, wherein the concentration of the oxalic acid is between 6 and 12g / L, and the concentration of the reinforcing agent is between 10 and 16g / L. The chemical grouting material has safe surface operation, and has good water plugging effect on stratums with micro cracks.

Description

Technical field: [0001] The invention relates to a chemical grouting material used in the field of coal mines, in particular to a chemical grouting material for ground pre-grouting. Background technique: [0002] In the process of wellbore grouting, in some special formations, such as small cracks, porous cracks, weak faults, etc., often due to the development of cracks and abundant water, granular materials cannot penetrate, resulting in a large amount of water gushing during excavation, which increases mine construction. cost and seriously affect the construction progress. For example, when the vertical shaft shaft of Liuzhuang Coal Mine in Xinji, Huainan was grouted through the quartz sandstone formation with small cracks, the main, auxiliary, and wind shafts all had different degrees of water gushing, and they were able to pass through the second grouting; When the vertical shaft of the inlet and return air shaft passes through the 50m thick Liujiagou sandstone, due to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/44
Inventor 赵宏伟宋雪飞周兴旺徐润高岗荣左永江周华群郑军丁振宇肖炜冯旭海吴莹马冰
Owner BEIJING CHINA COAL MINE ENG CO LTD