CN109707339B - Hole sealing method for coal pillar grouting reinforcement - Google Patents
Hole sealing method for coal pillar grouting reinforcement Download PDFInfo
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- CN109707339B CN109707339B CN201910032260.XA CN201910032260A CN109707339B CN 109707339 B CN109707339 B CN 109707339B CN 201910032260 A CN201910032260 A CN 201910032260A CN 109707339 B CN109707339 B CN 109707339B
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Abstract
The invention provides a hole sealing method for coal pillar grouting reinforcement, which comprises the following three steps: firstly, drilling a grouting hole, then laying a grouting pipeline in the grouting hole according to a certain connection sequence, then preparing grouting double liquid according to a certain proportion, and finally injecting the prepared grouting double liquid into the grouting hole through a grouting pump and a mixer, namely a grouting interval between a hole packer and a grouting hole orifice, so that when the grouting hole orifice is full of slurry, the slurry leakage prevention treatment in the grouting reinforcement process of the coal pillar is also completed. The grouting hole sealing method can ensure that the sealing performance of the orifice of the grouting hole is good, the orifice cannot leak slurry when the grouting pressure is high, and the slurry leakage frequency of the anchor rod and anchor cable hole is greatly reduced; the slurry diffusion range is enlarged, the grouting amount is more, and the reinforcing effect is obvious; the operation process is simple, the grouting work efficiency can be obviously improved, and the grouting and hole sealing effect of the coal pillar can be effectively improved by the first grouting steel pipe connected between the hole sealing device and the perforated pipe.
Description
Technical Field
The invention belongs to the technical field of grouting reinforcement hole sealing methods, and particularly relates to a hole sealing method for coal pillar grouting reinforcement.
Background
With the construction of socialist modernization, the consumption of coal energy in China is remarkably increased, the reserves of the coal energy are sharply reduced, and particularly the reserves of shallow coal mines and open coal mines are sharply reduced. In order to provide continuous coal resources for national development, deep coal mining begins to step on the stage of the era. Along with the deepening of mining, various problems come along, such as the existence of objective problems of high ground stress, large deformation of a roadway, serious floor heave and the like, and a severe test is brought to the deep mining of the coal mine.
The roadway support mode in the deep coal mine exploitation is very key, and the roadway support is adopted to keep the smoothness of the roadway and the stability of surrounding rocks, so that the method has important significance for coal mine construction and production. In order to solve the problem of roadway support, a composite support mode is developed, for example, a composite support mode of a high-stress anchor rod support-grouting modification-hydraulic fracturing pressure relief cooperative control technology is adopted for middlings Xinkuijiangdong mine.
In the process of grouting support in composite support, micro-nano inorganic-organic composite modified double-liquid grouting material is generally adopted as grouting material and a traditional grouting pipeline laying mode. The traditional laying mode is that a grouting steel pipe is connected with a hole packer in a grouting hole, and a perforated pipe is connected behind the hole packer. When the paving mode is adopted for grouting, the grouting holes, the anchor rod holes, the anchor cable holes and the coal seam have serious slurry leakage, and the grouting reinforcement efficiency is greatly reduced.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a hole sealing method for coal pillar grouting reinforcement, which at least solves the problems of serious slurry leakage, insufficient grouting amount and insufficient slurry diffusion caused by the conventional grouting mode, thereby causing low grouting reinforcement efficiency.
In order to achieve the above purpose, the invention provides the following technical scheme:
a hole sealing method for grouting reinforcement of a coal pillar comprises the following steps:
(1) laying of grouting pipelines
Drilling according to the aperture of the hole packer to form a grouting hole, and paving a grouting pipeline in the grouting hole; the connection part of the perforated pipe and the first grouting steel pipe, the connection part of the first grouting steel pipe and the hole packer and the connection part of the hole packer and the second grouting steel pipe are all provided with pipe hoops for sealing and connecting grouting pipelines;
(2) preparation of grouting slurry
After the laying of a grouting pipeline is finished, preparing two grouting liquids, namely a first grouting liquid and a second grouting liquid, wherein the two grouting liquids are respectively prepared by uniformly mixing the treated sulphoaluminate cement and water; the second slurry is prepared by mixing the treated lime and the treated gypsum to form a mixture and then uniformly mixing the mixture and water;
(3) hole sealing
After the grouting double-liquid preparation is finished, injecting prepared first slurry and second slurry into a grouting hole through a grouting pump and a mixer, wherein the section from the position of a hole packer to the position of a hole opening of a drill hole is a grouting section, grouting is carried out in the grouting section, and when the hole opening of the grouting hole is filled with the slurry, the grouting reinforcement process of the coal pillar is finished; after grouting double-liquid filling, the slurry is solidified within 2-10 min, so that the sealing effect on the grouting hole is achieved.
In the coal pillar grouting reinforcement hole sealing method, preferably, one or more first grouting steel pipes are provided, the number of the first grouting steel pipes is set according to the depth of a grouting hole, and two adjacent first grouting steel pipes are connected in a sealing manner by using pipe hoops.
In the coal pillar grouting reinforcement hole sealing method, preferably, the depth of the grouting hole is 4-10 m.
In the coal pillar grouting reinforcement hole sealing method, preferably, the lengths of the first grouting steel pipe and the second grouting steel pipe are both 1-2 m.
In the coal pillar grouting reinforcement hole sealing method, preferably, the treated sulphoaluminate cement in the step (2) is a yellow material, and the yellow material comprises 90-110 parts of sulphoaluminate cement, 1-3 parts of a water reducing agent and 0.5-1 part of an early strength agent which are uniformly mixed according to weight fraction;
preferably, the sulphoaluminate cement is milled by an air flow mill, and the particle size is D95 ≤ 10 μm.
In the coal pillar grouting reinforcement hole sealing method, preferably, the treated sulphoaluminate cement and water are uniformly mixed according to the mass ratio of 1 (0.6-1) to prepare the first slurry.
In the coal pillar grouting reinforcement hole sealing method, preferably, the treated lime and the treated gypsum in the step (2) are white materials, and the white materials comprise, by weight, 10-15 parts of lime, 85-90 parts of gypsum, 1-3 parts of a water reducing agent and 0.5-1 part of an early strength agent, which are uniformly mixed;
preferably, the lime and the gypsum are ground by an air current mill, and the particle size of the particles is D95 which is less than or equal to 10 mu m;
preferably, the mixture of the treated lime and the treated gypsum is uniformly mixed with water according to the mass ratio of 1 (0.6-1) to prepare the second slurry.
In the method for sealing the coal pillar by grouting reinforcement as described above, preferably, the amounts of the first slurry and the second slurry injected into the grouting hole in the step (3) are equal.
In the method for sealing the coal pillar by grouting reinforcement, preferably, one end of the hole packer is further provided with cotton yarns, and the end of the hole packer close to the orifice of the grouting hole is wrapped with the cotton yarns, so that grout is prevented from flowing to the deep part of the grouting hole beyond the hole packer during grouting.
In the coal pillar grouting reinforcement hole sealing method, preferably, the length of the grouting interval in the step (3) is not less than 2 m.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the hole sealing method for coal pillar grouting reinforcement adopts a novel pipeline laying mode on one hand, and performs grouting reinforcement in a grouting interval between a hole packer and a grouting hole orifice on the other hand, so that the grouting hole sealing method has the following excellent effects:
1. the grouting pipeline laying mode is different from the traditional grouting pipeline laying mode, and has the unique characteristics that the sealing performance of the orifice of a grouting hole is good, the orifice cannot leak slurry when the grouting pressure is high, and the slurry leakage frequency of the anchor rod and anchor cable hole is greatly reduced;
2. after the grouting hole sealing method is used, the diffusion range of the slurry is enlarged, the grouting amount is more, and the reinforcing effect is obvious;
3. the operation process is simple, the grouting work efficiency can be obviously improved, the first grouting steel pipe connected between the hole packer and the perforated pipe can effectively improve the grouting hole sealing effect of the coal pillar, and the grouting hole sealing effect is better when the number of the first grouting steel pipes is larger, namely the perforated pipe is farther from the orifice of the grouting hole.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 shows the manner of laying the grouting pipes in example 1 of the present invention;
FIG. 2 shows the manner of laying the grouting pipes in example 2 of the present invention;
FIG. 3 shows the manner of laying the grouting pipes according to embodiment 3 of the present invention;
FIG. 4 shows the manner of laying the grouting pipes according to comparative example 1 of the present invention;
FIG. 5 shows the manner of laying the grouting pipes according to comparative example 2 of the present invention;
FIG. 6 shows the manner of laying the grouting pipes in comparative example 3 of the present invention.
In the figure: 1. a floral tube; 2. a first grouting steel pipe; 3. a hole packer; 4. a second grouting steel pipe; 5. and (4) a pipe clamp.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The hole sealing method for coal pillar grouting reinforcement mainly comprises three steps, firstly, drilling a grouting hole, then laying a grouting pipeline in the grouting hole according to a certain connection sequence, then preparing grouting double liquid according to a certain proportion, and finally injecting the prepared grouting double liquid into the grouting hole through a grouting pump and a mixer, namely a grouting interval between a hole sealing device and a grouting hole orifice, and finishing the leakage prevention treatment in the grouting reinforcement process of the coal pillar when the grouting hole orifice is filled with grout.
The grouting reinforcement method is simple to operate, the grouting pressure and the grouting amount can be effectively improved, the grouting diffusion range is enlarged, the sealing performance of a grouting hole opening is good, grouting double liquid is filled in a grouting area from the position of a hole packer to the position of the grouting hole opening, the first grouting liquid and the second grouting liquid are solidified within 2-10 min, the sealing effect is achieved, and the grouting liquid cannot be extruded out along a drilled hole when the next grouting work is carried out. The grouting pressure is improved, and meanwhile, the slurry leakage is avoided, so that the slurry leakage frequency of the anchor rod and the anchor cable hole is greatly reduced, and the grouting reinforcement work efficiency is improved.
The invention provides a hole sealing method for coal pillar grouting reinforcement, which comprises the following steps:
(1) laying of grouting pipelines
Drilling according to the aperture of the hole packer 3 to form a grouting hole, and paving a grouting pipeline in the grouting hole; a perforated pipe 1, a first grouting steel pipe 2, a hole packer 3 and a second grouting steel pipe 4 are sequentially connected in the grouting hole from bottom to top, and pipe hoops 5 are arranged at the joint of the perforated pipe 1 and the first grouting steel pipe 2, the joint of the first grouting steel pipe 2 and the hole packer 3 and the joint of the hole packer 3 and the second grouting steel pipe 4 and used for being connected with a grouting pipeline in a sealing mode.
Preferably, there are one or more first steel pipes 2, the number of the first steel pipes 2 is set according to the depth of the grouting hole, and two adjacent first steel pipes 2 are connected and sealed by a pipe hoop 5.
Preferably, the depth of the grouting hole is 4-10 m (such as 4m, 5m, 6m, 7m, 8m, 9m, 10 m).
Preferably, the lengths of the first and second steel pipes 2 and 4 are both 1-2 m (e.g. 1m, 1.5m, 2 m).
Preferably, one end of the hole packer 3 is provided with cotton yarn, and the cotton yarn is wrapped at the end of the hole packer 3 close to the opening of the grouting hole, so that the grout is prevented from flowing to the deep part of the grouting hole beyond the hole packer 3 during grouting.
(2) Preparation of grouting slurry
After the grouting pipeline is laid, two grouting double liquids are prepared, namely a first grout and a second grout respectively, wherein the first grout is prepared by uniformly mixing the treated sulphoaluminate cement and water according to the mass ratio of 1 (0.6-1) (such as 1:0.6, 1:0.65, 1:0.7, 1:0.75, 1:0.8, 1:0.85, 1:0.9, 1:0.95 and 1: 1); the second slurry is prepared by mixing the treated lime and the treated gypsum to form a mixture, and then uniformly mixing the mixture and water according to a mass ratio of 1 (0.6-1) (such as 1:0.6, 1:0.65, 1:0.7, 1:0.75, 1:0.8, 1:0.85, 1:0.9, 1:0.95 and 1: 1);
preferably, the treated sulphoaluminate cement is a yellow material, and the yellow material comprises 90-110 parts (such as 92 parts, 94 parts, 96 parts, 98 parts, 100 parts, 102 parts, 104 parts, 106 parts and 108 parts) of sulphoaluminate cement, 1-3 parts (such as 1 part, 2 parts and 3 parts) of a water reducing agent, 0.5-1 part (such as 0.6 part, 0.7 part, 0.8 part, 0.9 part and 1 part) of an early strength agent, which are uniformly mixed according to the weight fraction; preferably, the sulphoaluminate cement is milled by an air flow mill, and the particle size is D95 less than or equal to 10 mu m.
Preferably, the treated lime and the treated gypsum are white materials, and the white materials comprise, by weight, 10-15 parts (for example, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts and 14.5 parts) of lime, 85-90 parts (for example, 85.5 parts, 86 parts, 86.5 parts, 87 parts, 87.5 parts, 88 parts, 88.5 parts, 89 parts and 89.5 parts) of gypsum, 1-3 parts (for example, 1 part, 2 parts and 3 parts) of a water reducing agent, 0.5-1 part (for example, 0.6 part, 0.7 part, 0.8 part, 0.9 part and 1 part) of an early strength agent, and are uniformly mixed; preferably, the lime and the gypsum are ground by an air current mill, and the particle size of the particles is D95 less than or equal to 10 mu m.
The sulphoaluminate cement, lime and gypsum in the invention are all commercial products.
The water reducing agent in the invention is one of a naphthalene water reducing agent, a melamine water reducing agent and a polycarboxylic acid water reducing agent.
The early strength agent in the invention is one of inorganic salts, chlorate and sulphoaluminate, such as sodium chloride, calcium chloride, sodium sulfate, sodium metaaluminate, aluminum sulfate, sodium silicate and the like.
(3) Hole sealing
After the grouting double-liquid preparation is finished, injecting prepared first slurry and second slurry into a grouting hole through a grouting pump and a mixer, wherein the section from the position of a hole packer 3 to the position of a drill hole opening is a grouting section, grouting is carried out in the grouting section, and when the grouting hole opening is filled with the slurry, the grouting reinforcement process of the coal pillar is finished; after the grouting is filled in two liquids, the grouting liquid is solidified within 2-10 min (such as 3min, 4min, 5min, 6min, 7min, 8min and 9min), so that the sealing effect on the grouting hole is achieved.
Preferably, the amount of the first slurry and the second slurry injected into the grouting holes is equal.
Preferably, the length of the grouting interval is not less than 2 m.
Example 1
The invention provides a hole sealing method for coal pillar grouting reinforcement, which comprises the following steps:
(1) laying of grouting pipelines
Drilling according to the aperture of the hole packer 3 to form a grouting hole with the depth of 4m, and paving a grouting pipeline in the grouting hole; 1m of perforated pipes 1, 1 pipe hoop 5, 1m of first grouting steel pipes 2, 1 pipe hoop 5, 1 hole packer 3 with 0.4m, 1 pipe hoop 5 and 21 m of second grouting steel pipes 4 are sequentially connected in a 4m grouting hole from bottom to top, as shown in figure 1; one end of the hole packer 3 facing the opening direction of the grouting hole is wrapped with a certain amount of cotton yarns, and the cotton yarns are wrapped outside a pipe hoop 5 connected with the hole packer 3 and the second grouting steel pipe 4, so that the phenomenon that during grouting, grout flows to the deep part of the grouting hole beyond the hole packer 3 to cause the hole packer 3 to be incapable of playing a role is prevented.
(2) Preparation of grouting slurry
After the grouting pipeline is laid, preparing grouting double liquid, wherein the mass of the first grout and the second grout is equal, adding 25Kg of yellow material into a pneumatic stirring barrel, then adding 15Kg of water, uniformly mixing according to the mass ratio of 1:0.6, stirring for 2min, forming first grout after uniform mixing, adding 25Kg of white material into another pneumatic stirring barrel, then adding 15Kg of water, uniformly mixing according to the mass ratio of 1:0.6, stirring for 2min, and forming second grout after uniform mixing;
wherein the yellow material is sulphoaluminate cement which is milled by an air flow mill, the particle size of the particles is D95 which is less than or equal to 10 mu m, and then 100 parts of sulphoaluminate cement, 2 parts of naphthalene water reducing agent and 0.5 part of sodium metaaluminate early strength agent are used. The cement is prepared by evenly mixing, namely adding 25Kg of sulphoaluminate cement, 0.5Kg of water reducing agent and 0.125Kg of early strength agent.
The white material is lime and gypsum which are milled by an air flow mill, the particle size of the particles is D95 which is less than or equal to 10 mu m, and then the white material is prepared by evenly mixing 12.5 parts of lime, 87.5 parts of gypsum, 2 parts of naphthalene water reducing agent and 0.5 part of sodium metaaluminate early strength agent, namely adding 3.125Kg of lime, 21.875Kg of gypsum, 0.5Kg of water reducing agent and 0.125Kg of early strength agent.
(3) Hole sealing
After the grouting double-liquid preparation is finished, injecting prepared first slurry and second slurry into a grouting hole through a grouting pump and a mixer, wherein the section from the position of a hole packer 3 to the position of a hole opening of a drill hole is a grouting section, the grouting section is 2m in the embodiment, grouting is performed in the grouting section, and when the hole opening of the grouting hole is filled with slurry, the grouting reinforcement process of the coal pillar is finished, and grouting is stopped; after the grouting slurry is filled, the grouting slurry is solidified within 8min, so that the sealing effect on the grouting hole is achieved, and the slurry leakage prevention treatment in the grouting reinforcement process of the coal pillar is completed.
Example 2
(1) Laying of grouting pipelines
Drilling according to the aperture of the hole packer 3 to form a grouting hole with the depth of 5m, and paving a grouting pipeline in the grouting hole; 1m of perforated pipes 1, 1 pipe hoop 5, 21 m of first grouting steel pipes 2, 1 pipe hoop 5, 1 0.4m hole packer 3, 1 pipe hoop 5 and 21 m of second grouting steel pipes 4 are sequentially connected in the 5m grouting holes from bottom to top, as shown in FIG. 2; one end of the hole packer 3 facing the opening direction of the grouting hole is wrapped with a certain amount of cotton yarns, and the cotton yarns are wrapped outside a pipe hoop 5 connected with the hole packer 3 and the second grouting steel pipe 4, so that the phenomenon that during grouting, grout flows to the deep part of the grouting hole beyond the hole packer 3 to cause the hole packer 3 to be incapable of playing a role is prevented.
(2) Preparation of grouting slurry
After the grouting pipeline is laid, preparing grouting double liquid, wherein the mass of the first grout and the second grout is equal, adding 25Kg of yellow material into a pneumatic stirring barrel, then adding 15Kg of water, uniformly mixing according to the mass ratio of 1:0.6, stirring for 2min, forming first grout after uniform mixing, adding 25Kg of white material into another pneumatic stirring barrel, then adding 15Kg of water, uniformly mixing according to the mass ratio of 1:0.6, stirring for 2min, and forming second grout after uniform mixing;
wherein the yellow material is prepared by grinding sulphoaluminate cement by an airflow mill, the particle size of the particles is D95 which is less than or equal to 10 mu m, and then uniformly mixing 100 parts of sulphoaluminate cement, 1 part of melamine water reducing agent and 0.5 part of aluminum sulfate early strength agent, namely adding 25Kg of sulphoaluminate cement, 0.25Kg of water reducing agent and 0.125Kg of early strength agent.
The white material is prepared by grinding lime and gypsum through an air flow mill, wherein the particle size of the particles is D95 which is less than or equal to 10 mu m, and then evenly mixing 12.5 parts of lime, 87.5 parts of gypsum, 1 part of melamine water reducing agent and 0.5 part of aluminum sulfate early strength agent, namely adding 3.125Kg of lime, 21.875Kg of gypsum, 0.25Kg of water reducing agent and 0.125Kg of early strength agent.
(3) Hole sealing
After the grouting double-liquid preparation is finished, injecting prepared first slurry and second slurry into a grouting hole through a grouting pump and a mixer, wherein the section from the position of a hole packer 3 to the position of a hole opening of a drill hole is a grouting section, the grouting section is 2m in the embodiment, grouting is performed in the grouting section, and when the hole opening of the grouting hole is filled with slurry, the grouting reinforcement process of the coal pillar is finished, and grouting is stopped; after the grouting slurry is filled, the grouting slurry is solidified within 7min, so that the sealing effect on the grouting hole is achieved, and the slurry leakage prevention treatment in the grouting reinforcement process of the coal pillar is completed.
Example 3
(1) Laying of grouting pipelines
Drilling according to the aperture of the hole packer 3 to form a grouting hole with the depth of 6m, and paving a grouting pipeline in the grouting hole; 1m of perforated pipes 1, 1 pipe hoop 5, 3 1m of first grouting steel pipes 2, 1 pipe hoop 5, 1 0.4m of hole packer 3 and 21 m of second grouting steel pipes 4 are sequentially connected in the 6m grouting holes from bottom to top, as shown in FIG. 3; one end of the hole packer 3 facing the opening direction of the grouting hole is wrapped with a certain amount of cotton yarns, and the cotton yarns are wrapped outside a pipe hoop 5 connected with the hole packer 3 and the second grouting steel pipe 4, so that the phenomenon that during grouting, grout flows to the deep part of the grouting hole beyond the hole packer 3 to cause the hole packer 3 to be incapable of playing a role is prevented.
(2) Preparation of grouting slurry
After the grouting pipeline is laid, preparing grouting double liquid, wherein the mass of the first slurry is equal to that of the second slurry, adding 25Kg of yellow material into a pneumatic stirring barrel, then adding 25Kg of water, uniformly mixing according to the mass ratio of 1:1, stirring for 2min, uniformly mixing to form first slurry, adding 25Kg of white material into another pneumatic stirring barrel, uniformly mixing according to the mass ratio of 1:1, stirring for 2min, and uniformly mixing to form second slurry;
the yellow material is prepared by grinding sulphoaluminate cement by an airflow mill, wherein the particle size of the particles is D95 which is less than or equal to 10 mu m, and then uniformly mixing 100 parts of sulphoaluminate cement, 2 parts of polycarboxylic acid water reducing agent and 1 part of aluminum sulfate early strength agent, namely adding 25Kg of sulphoaluminate cement, 0.5Kg of water reducing agent and 0.25Kg of early strength agent.
The white material is prepared by grinding lime and gypsum through an air flow mill, wherein the particle size of the particles is D95 which is less than or equal to 10 mu m, and then evenly mixing 12.5 parts of lime, 87.5 parts of gypsum, 2 parts of polycarboxylic acid water reducing agent and 1 part of aluminum sulfate early strength agent, namely adding 3.125Kg of lime, 21.875Kg of gypsum, 0.5Kg of water reducing agent and 0.25Kg of early strength agent.
(3) Hole sealing
After the grouting double-liquid preparation is finished, injecting prepared first slurry and second slurry into a grouting hole through a grouting pump and a mixer, wherein the section from the position of a hole packer 3 to the position of a hole opening of a drill hole is a grouting section, the grouting section is 2m in the embodiment, grouting is performed in the grouting section, and when the hole opening of the grouting hole is filled with slurry, the grouting reinforcement process of the coal pillar is finished, and grouting is stopped; after the grouting slurry is filled, the grouting slurry is solidified within 10min, so that the sealing effect on the grouting hole is achieved, and the slurry leakage prevention treatment in the grouting reinforcement process of the coal pillar is completed.
Example 4
Example 4 differs from example 2 in that the grouting pipe is laid in step (1) as follows: 1-meter perforated pipe 1, 1 pipe hoop 5, 1 first grouting steel pipe 2 with 2 meters, 1 pipe hoop 5, 1 hole packer 3 with 0.4 meter, 1 pipe hoop 5 and 1 second grouting steel pipe 4 with 2 meters are sequentially connected in a grouting hole with 5 meters from bottom to top; other steps are the same as those in embodiment 2, and are not described herein again.
Example 5
Example 5 differs from example 3 in that the grouting pipe is laid in step (1) as follows: 1-meter perforated pipe 1, 1 pipe hoop 5, 1 first grouting steel pipe 2 with 2 meters, 1 pipe hoop 5, 1 first grouting steel pipe 2 with 1 meter, 1 hole packer 3 with 0.4 meter, 1 pipe hoop 5 and 1 second grouting steel pipe 4 with 2 meters are sequentially connected in a grouting hole with 6 meters from bottom to top; other steps are the same as those in embodiment 3, and are not described herein again.
Example 6
Example 6 differs from example 3 in that the grouting pipe is laid in step (1) as follows: 1-meter perforated pipe 1, 1 pipe hoop 5, 1 first grouting steel pipe 2 with 2 meters, 1 pipe hoop 5, 1 first grouting steel pipe 2 with 1 meter, 1 hole packer 3 with 0.4 meter, 1 pipe hoop 5 and 2 second grouting steel pipes 4 with 1 meter are sequentially connected in a grouting hole with 6 meters from bottom to top; other steps are the same as those in embodiment 3, and are not described herein again.
Comparative example 1
Comparative example 1 differs from example 1 in that the grouting pipe is laid in step (1) as follows: 3 pieces of 1m perforated pipes 1, 1 pipe hoop 5, 1 piece of hole packer 3 with 0.4m, 1 piece of pipe hoop 5 and 1 piece of 1m second grouting steel pipe 4 are sequentially connected in the 4m grouting holes from bottom to top, as shown in figure 4; in addition, the hole sealing grouting reinforcement treatment in the step (3) is omitted; other steps are the same as those in embodiment 1, and are not described herein again.
Comparative example 2
Comparative example 2 differs from example 2 in that the grouting pipe is laid in step (1) as follows: 4 pieces of 1m perforated pipes 1, 1 pipe hoop 5, 1 piece of hole packer 3 with 0.4m, 1 piece of pipe hoop 5 and 1 piece of 1m second grouting steel pipe 4 are sequentially connected in the 5m grouting holes from bottom to top, as shown in figure 5; in addition, the hole sealing grouting reinforcement treatment in the step (3) is omitted; other steps are the same as those in embodiment 2, and are not described herein again.
Comparative example 3
Comparative example 3 differs from example 3 in that the grouting pipe is laid in step (1) as follows: 5 pieces of 1m perforated pipes 1, 1 pipe hoop 5, 1 piece of hole packer 3 with 0.4m, 1 piece of pipe hoop 5 and 1 piece of 1m second grouting steel pipe 4 are sequentially connected from bottom to top in a grouting hole with the length of 6m, as shown in figure 6; in addition, the hole sealing grouting reinforcement treatment in the step (3) is omitted; other steps are the same as those in embodiment 3, and are not described herein again.
After the grouting pipes of examples 1 to 3 and comparative examples 1 to 3 were laid, and the grout for grouting reinforcement of examples 1 to 3 was solidified, the grouting pipes were grouted by a grouting pump and a mixer, and the grouting time, the grouting frequency, the grouting amount, and the grouting pressure were recorded, and the grout diffusion radius was measured, and the results are shown in table 1 below.
TABLE 1 reinforcing effect after grouting of different examples and comparative examples
As can be seen from the data in table 1, the grouting and hole sealing methods of embodiments 1 to 3 of the present invention can greatly reduce the frequency of slurry leakage, significantly increase the grouting amount, enlarge the slurry diffusion radius, and increase the grouting pressure in the same grouting time. The slurry leakage frequency of the three groups of grouting holes is reduced by 80%, 93% and 93% in sequence, the grouting amount is improved by 200%, 233% and 257% in sequence, and the diffusion radius is increased by 20%, 43% and 50% in sequence.
In summary, the following steps: the grouting pipeline laying mode and the hole sealing method can obviously improve the grouting effect, and the grout can not be extruded along the drilled hole in the grouting process of the grouting pipeline. The grouting pressure is improved, and meanwhile, the slurry leakage is avoided, so that the slurry leakage frequency of the anchor rod and the anchor cable hole is greatly reduced, and the grouting reinforcement work efficiency is improved.
In addition, the longer the effective distance of slip casting hole sealing, the better the hole sealing effect, the effective hole sealing depth of slip casting interval more than or equal to 2m promptly, the slip casting hole drill way can not leak during the slip casting, the slip casting interval is big more, and second slip casting steel pipe quantity is more, and the hole sealing effect is better. The first slip casting steel pipe of being connected between hole packer and the floral tube also can effectively improve the slip casting hole sealing effect of coal pillar, and first slip casting steel pipe quantity is more, and the floral tube is far away from the slip casting hole drill way promptly, and the slip casting is consolidated the effect better.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A hole sealing method for grouting reinforcement of a coal pillar is characterized by comprising the following steps:
(1) laying of grouting pipelines
Drilling according to the aperture of the hole packer to form a grouting hole, wherein the depth of the grouting hole is 5-10 m, and a grouting pipeline is laid in the grouting hole; the connection part of the perforated pipe and the first grouting steel pipe, the connection part of the first grouting steel pipe and the hole packer and the connection part of the hole packer and the second grouting steel pipe are all provided with pipe hoops for sealing and connecting grouting pipelines; the number of the floral tubes is one, and the length of the floral tubes is 1 m; the lengths of the first grouting steel pipe and the second grouting steel pipe are both 1-2 m;
one or more first grouting steel pipes are arranged, the number of the first grouting steel pipes is set according to the depth of the grouting holes, and two adjacent first grouting steel pipes are connected in a sealing mode through pipe hoops; adjusting and increasing the number of the first grouting steel pipes according to the depth of the grouting holes, and increasing the number of the first grouting steel pipes so as to improve the grouting amount and the grouting pressure, enlarge the diffusion radius of the grout and reduce the frequency of grout leakage;
(2) preparation of grouting slurry
After the laying of a grouting pipeline is finished, preparing two grouting liquids, namely a first grouting liquid and a second grouting liquid, wherein the two grouting liquids are respectively prepared by uniformly mixing the treated sulphoaluminate cement and water; the second slurry is prepared by mixing the treated lime and the treated gypsum to form a mixture and then uniformly mixing the mixture and water;
the treated sulphoaluminate cement is a yellow material, and the yellow material comprises 90-110 parts of sulphoaluminate cement, 1-3 parts of a water reducing agent and 0.5-1 part of an early strength agent which are uniformly mixed according to weight fraction;
the treated lime and the treated gypsum are white materials, and the white materials comprise, by weight, 10-15 parts of lime, 85-90 parts of gypsum, 1-3 parts of a water reducing agent and 0.5-1 part of an early strength agent, which are uniformly mixed;
(3) hole sealing
After the grouting double-liquid preparation is finished, injecting prepared first slurry and second slurry into a grouting hole through a grouting pump and a mixer, wherein the section from the position of a hole packer to the position of a hole opening of a drill hole is a grouting section, grouting is carried out in the grouting section, and when the hole opening of the grouting hole is filled with the slurry, the grouting reinforcement process of the coal pillar is finished; after grouting double-liquid filling, solidifying within 2-10 min, thereby playing a role in sealing the grouting hole;
the length of the grouting interval is 2 m.
2. The coal pillar grouting reinforcement hole sealing method according to claim 1, wherein the sulphoaluminate cement is milled by an air flow mill, and the particle size is D95 ≤ 10 μm.
3. The coal pillar grouting reinforcement hole sealing method according to claim 1 or 2, wherein the treated sulphoaluminate cement and water are uniformly mixed according to a mass ratio of 1 (0.6-1) to prepare the first slurry.
4. The method for sealing the coal pillar through grouting reinforcement according to claim 1, wherein the lime and the gypsum are ground by an air current mill, and the particle size of the lime and the gypsum is D95 ≤ 10 μm.
5. The coal pillar grouting reinforcement hole sealing method according to claim 4, wherein a mixture of the treated lime and the treated gypsum is uniformly mixed with water according to a mass ratio of 1 (0.6-1) to prepare the second slurry.
6. The method for sealing coal pillar grouting reinforcement according to claim 1, wherein the amount of the first slurry and the second slurry injected into the grouting holes in the step (3) is equal.
7. The method for sealing the coal pillar by grouting reinforcement according to claim 1, wherein one end of the hole packer is further provided with cotton yarn, and the cotton yarn is wrapped at the end of the hole packer close to the opening of the grouting hole to prevent the grout from flowing to the deep part of the grouting hole beyond the hole packer during grouting.
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| CN113266302B (en) * | 2021-05-31 | 2022-11-18 | 国能神东煤炭集团有限责任公司 | Double-liquid grouting hole packer |
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