1. The utility model provides a goaf filling in-process thick liquids field sampling device which characterized in that: including outer tube (1), interior sleeve pipe (2), apron (5) and L shaped steel plate support (12), outer tube (1) is equipped with outer tube guide rail (3), interior sleeve pipe (2) are equipped with interior sleeve pipe slide rail (4) and spout (10), interior sleeve pipe slide rail (4) and outer tube guide rail (3) aim at, realize interior sleeve pipe (2) and insert outer tube (1), apron (5) insert spout (10), outer tube (1) are fixed through a pair of L shaped steel plate support (12) and bottom plate fixing expansion bolt (13).

2. The in-situ slurry sampling device during a goaf filling process in accordance with claim 1, wherein: the section of the outer sleeve (1) is square, the side length of the square is 200-300 mm, and the outer sleeve is processed by a thin-wall steel plate, and the thickness of the steel plate is 1-3 mm; the length of the outer sleeve (1) is determined according to the actual situation, and the outer sleeve (1) is processed by a steel plate in the length direction; a notch with the width of 20 mm-30 mm is reserved at the middle position of one side of the outer sleeve (1), the length of 300 mm-500 mm is reserved at one end of the inner side of the stope without making a notch, the end part of the inner side of the stope is sealed, the outer sleeve (1) extends out of the end part of the outer side of the stope to fill 200 mm-300 mm of the outer wall, and the end part of the outer side of the stope is completely opened.

3. The in-situ slurry sampling device during a goaf filling process in accordance with claim 1, wherein: outer tube guide rail (3) are semi-circular guide rail, and outer tube guide rail (3) welding does not establish trilateral inside intermediate position of breach in outer tube (1), and 4 ~ 6mm of outer tube guide rail (3) wall thickness, internal diameter are greater than 12mm, adopt the stainless steel pipe preparation, and the polishing treatment is done to outer tube guide rail (3) inside, and during the welding, guarantee that the guide rail is straight, be in the intermediate position, keep same complete guide rail of root on the length direction, and outer tube guide rail (3) run through whole outer tube (1).

4. The in-situ slurry sampling device during a goaf filling process in accordance with claim 1, wherein: the inner sleeve (2) is made of a thin-wall steel plate, the wall thickness is 0.5-2 mm, the inner sleeve is of a special-shaped section, three sides of the inner sleeve are the same in size and are 180-280 mm, a notch is reserved on the last side, and the size of the notch is 300-400 mm and is larger than that of the notch reserved in the outer sleeve; the steel plates on two sides of the notch of the inner sleeve are bent upwards in an inclined mode, so that after the inner sleeve (2) is installed and enters the outer sleeve (1), the highest point (11) of the inclined edge of the steel plate bent upwards in the inclined mode is in contact with the inner wall of the outer sleeve (1), and the lower point of the inclined edge is respectively machined into two sliding grooves (10) with two side edges.

5. The in-situ slurry sampling device used in the goaf filling process in the claim 4 is characterized in that: the depth of the sliding groove is 5-10 mm, and the height of the sliding groove is 1-5 mm.

6. The in-situ slurry sampling device during a goaf filling process in accordance with claim 1, wherein: the length of the inner sleeve (2) is 1m, the end part of one side of the inner sleeve (2) is welded and sealed by adopting steel plates with the same specification, the end part of the other side of the inner sleeve is open, when the inner sleeve is sealed, the cross section of the end part is ensured to be flat and smooth, the size of the end part back plate is consistent with that of a square area of the cross section, a sealing cushion layer (7) is pasted along the edge position of the cross section of the end part at two sides, bolt connecting plates are welded at four corner positions outside the square area of the cross section respectively, the thickness of each connecting plate is larger than or equal to 2.

7. The in-situ slurry sampling device during a goaf filling process in accordance with claim 1, wherein: the inner sleeve sliding rail (4) is a solid optical axis, the inner sleeve sliding rail (4) is welded at the position of the side length central line outside the square area of the section of the inner sleeve (2), the size of the optical axis is matched with that of the outer sleeve guide rail (3), when the inner sleeve (2) is inserted into the outer sleeve (1), the trilateral inner sleeve sliding rails (4) are in full contact with the outer sleeve guide rail (3), and the outer sleeve guide rail (3) is positioned at the central position of the inner sleeve sliding rail (4); the inner sleeve sliding rails (4) on one side of the same inner sleeve are made of the same optical axis, so that the optical axis is positioned at the center line position of each side and is straight; both ends of the same inner sleeve sliding rail (4) are processed into round heads and polished.

8. The in-situ slurry sampling device during a goaf filling process in accordance with claim 1, wherein: the cover plate (5) is made of steel plates, the thickness of the cover plate is 0.5-4 mm, the width of the cover plate (5) is 189-289 mm, and the cover plate is guaranteed to be just inserted into the sliding groove (10) in the upper portion of the inner sleeve.

9. The use method of the slurry on-site sampling device in the goaf filling process as claimed in claim 1, wherein: the method comprises the following steps:

s1: leveling a field, ensuring the leveling of a bottom plate, and determining a sampling depth, a sampling depth and a sampling type according to a sampling scheme;

s2: constructing steel plate supports, manufacturing L-shaped steel plate supports (12), arranging the L-shaped steel plate supports (12) in pairs, wherein the distance between each pair of L-shaped steel plate supports (12) is the same as the size of the outer wall of the outer sleeve (1), arranging a pair of L-shaped steel plate supports (12) at intervals of 1-5 m according to the length of the outer sleeve (1), arranging the L-shaped steel plate supports (12) along a straight line in the length direction, avoiding turning, and fixing the short edges of the L-shaped steel plate supports (12) on a bottom plate by adopting bottom plate fixing expansion bolts (13);

s3: arranging outer sleeves, wherein one side of a gap of each outer sleeve is arranged at the top, the outer sleeves (1) are arranged inside each pair of L-shaped steel plate brackets (12) and welded to ensure that the outer sleeves (1) are on the same plane and kept straight, after arrangement, lubricating oil is smeared on the inner sides of outer sleeve guide rails (3), and when arrangement, the outer sleeves (1) extend out to fill the retaining walls by the length of 200-300 mm;

s4: inserting an inner sleeve, firstly smearing lubricating oil on the surface of an inner sleeve sliding rail (4), smearing demoulding oil on the inner side pipe wall of the inner sleeve, aligning the three-sided inner sleeve sliding rail (4) with an outer sleeve guide rail (3), slowly pushing the inner sleeve (1), connecting the first inner sleeve with a second inner sleeve by adopting a connecting bolt (8), connecting the closed end of the second inner sleeve with the open end of the first inner sleeve, and enabling a sealing cushion layer (7) at the end part to be stressed and extruded to be in close contact during connection so as to connect the required inner sleeve and push the outer sleeve (1), thereby ensuring that the splicing length of the inner sleeve is greater than the length of the outer sleeve;

s5: filling a stope, wherein slurry flows into the inner sleeve (2) through the outer sleeve notch and the inner sleeve notch, the inner sleeve (2) is drawn back and forth through manpower or a winch in the filling process, and the filling degree of the slurry in the inner sleeve is observed in the drawing process until the outermost inner sleeve is filled with the slurry;

s6: inserting the cover plate, and slowly pushing the cover plate (5) along the inner sleeve chute (10) until the filling height exceeds the height of the outer sleeve until the cover plate is pushed to the bottom;

s7: according to the sampling design requirement, extracting the inner sleeve before the slurry is initially set to obtain in-situ slurry; or maintaining in-situ maintenance, and after 3 days, extracting the inner sleeve to obtain the cemented filling bodies at different positions.

10. The use method of the slurry on-site sampling device in the goaf filling process in the claim 9 is characterized in that: in the step S7, when the in-situ maintenance is kept, the inner sleeve is pulled once every 6-8 hours, so that the inner sleeve is ensured to slide smoothly until the inner sleeve is finally and completely taken out.

Background

Compared with other mining methods, the filling mining method has the advantages of high recovery rate, low dilution rate, safe mining and the like, particularly has obvious advantages in the aspects of controlling ground pressure and improving environmental protection after deep mining, and related national departments give high attention to the requirement of newly-opened mines and adopt the filling mining method in principle.

One of the key factors in the mining of the filling method is the filling body strength, determines the reasonable filling body strength, and has key effects on controlling stope ground pressure, ensuring mining safety and reducing filling cost. Therefore, the strength research of the filling body becomes one of the research hotspots in the mining field at present, and is one of the core problems concerned by the large-scale mining industry. Currently, most of research on fillers is to prepare filler test pieces in a laboratory in the same proportion as the slurry filled on site and to perform maintenance under standard conditions. However, in the actual implementation of the filling method, there are many factors that affect the strength of the filling body, such as the stirring process, the conveying parameters, the stope blanking point, the stope size, and the like. After long-distance transportation, the filling slurry is often precipitated and isolated to a certain degree, and particularly after entering a stope, the filling slurry in the stope and the original proportion are changed greatly due to slow flowing and severe isolation. Therefore, the test is only carried out by means of indoor tests, the result is greatly different from the actual field, and in-situ sampling is required on the field.

At present, sampling of a field in-situ filling body is always a technical problem, and methods such as sampling by a geological drilling machine, pre-embedding a mold underground, taking a filling body and cutting the filling body in a large block are generally adopted.

The geological drilling machine has the advantages of high construction speed, flexible sampling size, large sampling depth and the like, but the filling body strength is usually low, so that the geological drilling machine is easy to break in the high-speed drilling process, and the sampling success rate is low. The underground pre-buried mould sampling has the advantages of low cost, flexibility and the like, but generally the sampling is carried out by adopting a mechanical cutting or even blasting mode after the adjacent stopes are mined to the pre-buried points, so that the filling body is extremely easy to damage, the sampling failure is caused, and meanwhile, the sampling period is long. The field is taken out of the large block of the filling body for cutting and sampling, so that the whole filling body is easily damaged and cannot be sampled.

At present, research on a filling body in-situ sampling technology is less, and the technology of the three means is mainly improved, for example, in the prior art, research on a filling body underground on-site sampling device has the advantages of simple processing, portability, high sampling speed, no damage to a filling body, high sampling success rate and the like, but the method has small sampling depth, and a sample is not representative and can not obtain on-site in-situ slurry.

Disclosure of Invention

The invention provides a slurry on-site sampling device in a goaf filling process and a using method thereof, aiming at solving the problems of high difficulty in on-site sampling of filling slurry, complex construction, low sampling success rate, insufficient sampling depth, poor representativeness, incapability of obtaining in-situ slurry and the like.

The device includes outer tube, interior sleeve pipe, apron and L shaped steel plate support, and the outer tube is equipped with the outer tube guide rail, and interior sleeve pipe is equipped with interior sleeve pipe slide rail and spout, and interior sleeve pipe slide rail aligns with the outer tube guide rail, realizes interior sleeve pipe and inserts the outer tube, and the apron inserts the spout, and the outer tube is fixed through the fixed expansion bolts of a pair of L shaped steel plate support and bottom plate.

Wherein the section of the outer sleeve is square, the side length of the square is 200 mm-300 mm, the outer sleeve is processed by thin-wall steel plates, and the thickness of the steel plates is 1 mm-3 mm; the length of the outer sleeve is determined according to the actual situation, and the outer sleeve is processed by a steel plate in the length direction; a notch with the width of 20 mm-30 mm is reserved in the middle of one side of the outer sleeve, the length of 300 mm-500 mm is reserved at one end of the inner side of the stope without making a notch, the end of the inner side of the stope is sealed, the outer sleeve extends out of the end of the outer side of the stope and fills 200 mm-300 mm of the outer wall, and the end of the outer sleeve is completely opened.

The outer sleeve guide rail is a semicircular guide rail, the outer sleeve guide rail is welded at the middle position of the three inner sides of the outer sleeve where no notch is formed, the wall thickness of the outer sleeve guide rail is 4-6 mm, the inner diameter of the outer sleeve guide rail is larger than 12mm, stainless steel pipes are adopted for manufacturing, polishing treatment is performed inside the outer sleeve guide rail, during welding, the guide rail is guaranteed to be straight and is located at the middle position, the same complete guide rail is kept in the length direction, and the outer sleeve guide rail penetrates through the whole outer sleeve.

The inner sleeve is made of a thin-wall steel plate, the wall thickness of the inner sleeve is 0.5-2 mm, the inner sleeve is of a special-shaped section, the sizes of three sides of the inner sleeve are the same and are 180-280 mm, a notch is reserved on the last side, and the size of the notch is 300-400 mm and is larger than that of the notch reserved in the outer sleeve; the steel plates on two sides of the notch of the inner sleeve are bent upwards in an inclined mode, so that after the inner sleeve is installed and enters the outer sleeve, the highest point of the inclined edge of the steel plate bent upwards in the inclined mode is in contact with the inner wall of the outer sleeve, and the lower point of the inclined edge of the steel plate is respectively machined into two sliding grooves with the two side edges.

The depth of the sliding groove is 5-10 mm, and the height of the sliding groove is 1-5 mm.

The processing length of the inner sleeve is 1m, the end part of one side of the inner sleeve is welded and sealed by adopting steel plates with the same specification, the end part of the other side of the inner sleeve is open, the cross section of the end part is ensured to be flat and smooth when the inner sleeve is sealed, the size of the end part back plate is consistent with that of the square area of the cross section, the sealing cushion layer is pasted along the edge positions of the cross sections of the end parts at the two sides, bolt connecting plates are welded at four corner positions outside the square area of the cross section respectively, the thickness of the connecting plates is more than or equal to 2mm, the side length is 10-20 mm, connecting bolts are installed on the connecting plates, and the diameter of the bolt opening is 8-16 mm.

The inner sleeve sliding rails are solid optical axes, the inner sleeve sliding rails are welded at the position of the side length central line outside the square area of the section of the inner sleeve, the size of the optical axis is matched with that of the outer sleeve guide rail, when the inner sleeve is inserted into the outer sleeve, the three inner sleeve sliding rails are completely contacted with the outer sleeve guide rail, and the outer sleeve guide rail is positioned at the central position of the inner sleeve sliding rails; the inner sleeve sliding rails on one side of the same inner sleeve are made of the same optical axis, so that the optical axis is ensured to be positioned at the center line position of each side and is straight; both ends of the same inner sleeve sliding rail are processed into round heads and polished.

The cover plate is made of a steel plate, the thickness of the cover plate is 0.5-4 mm, the width of the cover plate is 189-289 mm, and the cover plate is guaranteed to be just inserted into the chute at the upper part of the inner sleeve.

The use method of the sampling device comprises the following steps:

s1: leveling a field, ensuring the leveling of a bottom plate, and determining a sampling depth, a sampling depth and a sampling type according to a sampling scheme;

s2: constructing steel plate supports, manufacturing L-shaped steel plate supports, arranging the L-shaped steel plate supports in pairs, wherein the distance between each pair of L-shaped steel plate supports is the same as the size of the outer wall of the outer sleeve, arranging the pair of L-shaped steel plate supports every 1-5 m according to the length of the outer sleeve, arranging the L-shaped steel plate supports along a straight line in the length direction, avoiding turning, and fixing the short edges of the L-shaped steel plate supports on a bottom plate by adopting bottom plate fixing expansion bolts;

s3: arranging outer sleeves, wherein one side of the gap of each outer sleeve is arranged at the top, the outer sleeves are arranged inside each pair of L-shaped steel plate brackets and welded to ensure that the outer sleeves are on the same plane and kept straight, after the outer sleeves are arranged, lubricating oil is smeared on the inner sides of guide rails of the outer sleeves, and when the outer sleeves are arranged, the outer sleeves extend out of the filled retaining walls for 200-300 mm;

s4: inserting the inner sleeve, firstly coating lubricating oil on the surface of an inner sleeve sliding rail, coating demoulding oil on the inner side pipe wall of the inner sleeve, aligning the three-sided inner sleeve sliding rail with an outer sleeve guide rail, slowly pushing the three-sided inner sleeve sliding rail into a first inner sleeve, connecting the first inner sleeve with a second inner sleeve by adopting a connecting bolt, connecting the closed end of the second inner sleeve with the open end of the first inner sleeve, and enabling a sealing cushion layer at the end part to be stressed and extruded to be in close contact with the first inner sleeve when in connection so as to connect the required inner sleeve and push the required inner sleeve into the outer sleeve, thereby;

s5: filling a stope, wherein slurry flows into the inner sleeve through the outer sleeve notch and the inner sleeve notch, the inner sleeve is drawn back and forth through manpower or a winch in the filling process, and the filling degree of the slurry in the inner sleeve is observed in the drawing process until the outermost inner sleeve is filled with the slurry;

s6: inserting the cover plate, and slowly pushing the cover plate along the inner sleeve chute until the filling height exceeds the height of the outer sleeve until the cover plate is pushed to the bottom;

s7: according to the sampling design requirement, extracting the inner sleeve before the slurry is initially set to obtain in-situ slurry; or maintaining in-situ maintenance, and after 3 days, extracting the inner sleeve to obtain the cemented filling bodies at different positions.

In S7, when maintaining in-situ maintenance, the inner sleeve is pulled once every 6-8 h to ensure smooth sliding of the inner sleeve until the inner sleeve is finally and completely taken out.

The technical scheme of the invention has the following beneficial effects:

in the above scheme, adopt disconnect-type bushing structure, can assemble according to the sample requirement in a flexible way, simple structure, the installation is rapid. The inner sleeve can be repeatedly used, the cost is reduced, and the outer sleeve is retained in the filling body and can be used as a reinforcing structure, so that the overall strength of the filling body is improved. The sampling depth is large, the typical representativeness is achieved, and the sampling success rate is high. According to production needs, the filling slurry can be taken out in situ, and the filling body can also be taken out, so that different production inspection and test requirements can be met.

Drawings

FIG. 1 is a schematic view of the overall structure of a slurry on-site sampling device in the goaf filling process;

FIG. 2 is a top view of an outer sleeve of the slurry on-site sampling device in the goaf filling process according to the present invention;

FIG. 3 is a schematic cross-sectional view taken along line C-C of FIG. 2;

FIG. 4 is a schematic cross-sectional view taken along line D-D of FIG. 2;

FIG. 5 is a cross-sectional view of an inner casing of the slurry on-site sampling device in the goaf filling process according to the present invention;

FIG. 6 is a schematic sectional view taken along line A-A in FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along line B-B in FIG. 5;

FIG. 8 is a schematic diagram of the field connection of the slurry field sampling device in the goaf filling process.

Wherein: 1-outer sleeve; 2-inner sleeve; 3-outer casing guide rails; 4-inner sleeve sliding rail; 5-cover plate; 6-the distance between the highest point of the bevel edge and the inner wall of the outer sleeve; 7-sealing the cushion layer; 8-connecting bolts; 9-inner sleeve end back plate; 10-a chute; 11-the highest point of the hypotenuse; 12-L-shaped steel plate brackets; 13-fixing the expansion bolt on the bottom plate.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides a slurry on-site sampling device in a goaf filling process and a use method thereof.

As shown in fig. 1 and 8, the device comprises an outer sleeve 1, an inner sleeve 2, a cover plate 5 and an L-shaped steel plate bracket 12, wherein the outer sleeve 1 is provided with an outer sleeve guide rail 3, the inner sleeve 2 is provided with an inner sleeve slide rail 4 and a chute 10, the inner sleeve slide rail 4 is aligned with the outer sleeve guide rail 3 to realize that the inner sleeve 2 is inserted into the outer sleeve 1, the cover plate 5 is inserted into the chute 10, and the outer sleeve 1 is fixed by a pair of L-shaped steel plate brackets 12 and a bottom plate fixing expansion bolt 13.

As shown in fig. 2, 3 and 4, the section of the outer sleeve 1 is square, the side length of the square is 200 mm-300 mm, and the outer sleeve is processed by thin-wall steel plates, and the thickness of the steel plates is 1 mm-3 mm; the length of the outer sleeve 1 is determined according to the actual situation, and in the length direction, the outer sleeve 1 is processed by a steel plate; a notch with the width of 20 mm-30 mm is reserved at the middle position of one side of the outer sleeve 1, the length of 300 mm-500 mm is reserved at one end of the inner side of the stope without making a notch, the end part of the inner side of the stope is sealed, the outer sleeve 1 extends out of the filling retaining wall at the end part of the outer side of the stope by 200 mm-300 mm, and is completely opened at the end part of the outer side of the stope.

Outer tube guide rail 3 is semi-circular guide rail, and outer tube guide rail 3 welds the trilateral inside intermediate position that no breach was established to outer tube 1, and 3 wall thickness of outer tube guide rail 4 ~ 6mm, internal diameter are greater than 12mm, adopt nonrust steel pipe preparation, and the polishing treatment is done to outer tube guide rail 3 inside, and during the welding, guarantee that the guide rail is straight, be in the intermediate position, keep same complete guide rail of root on the length direction, and outer tube guide rail 3 runs through whole outer tube 1.

As shown in fig. 5, 6 and 7, the inner sleeve 2 is made of thin-wall steel plate, the wall thickness is 0.5-2 mm, the inner sleeve is of a special-shaped section, the sizes of three sides of the inner sleeve are the same and are 180-280 mm, a notch is reserved on the last side, and the size of the notch is 300-400 mm and is larger than the notch reserved on the outer sleeve; the steel plates on the two sides of the notch of the inner sleeve are bent upwards in an inclined mode, so that after the inner sleeve 2 is installed and enters the outer sleeve 1, the highest point 11 of the inclined edge of the steel plate bent upwards in the inclined mode is in contact with the inner wall of the outer sleeve 1, and the lower points of the inclined edge and the two side edges are respectively machined into two sliding grooves 10.

The depth of the sliding groove is 5-10 mm, and the height of the sliding groove is 1-5 mm.

The processing length of the inner sleeve 2 is 1m, the end part of one side of the inner sleeve 2 is welded and sealed by adopting steel plates with the same specification, the end part of the other side of the inner sleeve is open, the cross section of the end part is ensured to be flat and smooth when the inner sleeve is sealed, the size of the end back plate is consistent with that of the square area of the cross section, a sealing cushion layer 7 is adhered to the edge position of the cross section of the end part at two sides, bolt connecting plates are welded at four corner positions outside the square area of the cross section respectively, the thickness of each connecting plate is larger than or equal to 2mm, the side length is 10 mm-20 mm, a connecting bolt 8 is installed on each connecting plate, and the diameter of each bolt opening is 8 mm-16 mm.

The inner sleeve sliding rails 4 are solid optical axes, the inner sleeve sliding rails 4 are welded at the position of the side length central line outside the square area of the section of the inner sleeve 2, the size of the optical axis is matched with that of the outer sleeve guide rails 3, and when the inner sleeve 2 is inserted into the outer sleeve 1, the trilateral inner sleeve sliding rails 4 are completely contacted with the outer sleeve guide rails 3, and the outer sleeve guide rails 3 are positioned at the central positions of the inner sleeve sliding; the inner sleeve slide rails 4 on one side of the same inner sleeve are made of the same optical axis, so that the optical axis is positioned at the center line position of each side and is straight; both ends of the same inner sleeve sliding rail 4 are processed into round heads and polished.

The cover plate 5 is made of a steel plate, the thickness of the cover plate is 0.5-4 mm, the width of the cover plate 5 is 189-289 mm, and the cover plate is guaranteed to be just inserted into the upper sliding groove 10 of the inner sleeve.

The use method of the sampling device comprises the following steps:

s1: leveling a field, ensuring the leveling of a bottom plate, and determining a sampling depth, a sampling depth and a sampling type according to a sampling scheme;

s2: constructing steel plate supports, manufacturing L-shaped steel plate supports 12, arranging the L-shaped steel plate supports 12 in pairs, wherein the distance between each pair of L-shaped steel plate supports 12 is the same as the size of the outer wall of the outer sleeve 1, arranging a pair of L-shaped steel plate supports 12 at intervals of 1-5 m according to the length of the outer sleeve 1, arranging the L-shaped steel plate supports 12 along a straight line in the length direction, and fixing the short edges of the L-shaped steel plate supports 12 on a bottom plate by adopting bottom plate fixing expansion bolts 13 without turning;

s3: arranging outer sleeves, wherein one side of the gap of each outer sleeve is arranged at the top, the outer sleeves 1 are arranged inside each pair of L-shaped steel plate brackets 12 and are welded to ensure that the outer sleeves 1 are on the same plane and keep straight, after the arrangement is finished, lubricating oil is smeared on the inner sides of outer sleeve guide rails 3, and when the arrangement is finished, the outer sleeves 1 extend out to fill the retaining walls by the length of 200-300 mm;

s4: inserting the inner sleeve, firstly coating lubricating oil on the surface of an inner sleeve sliding rail 4, coating demoulding oil on the inner side pipe wall of the inner sleeve, then aligning the three-sided inner sleeve sliding rail 4 with an outer sleeve guide rail 3, slowly pushing the first inner sleeve 1, connecting the first inner sleeve with a second inner sleeve by adopting a connecting bolt 8, connecting the closed end of the second inner sleeve with the open end of the first inner sleeve, and enabling a sealing cushion layer 7 at the end part to be pressed and tightly contacted in a connecting way so as to connect the required inner sleeve and push the inner sleeve into the outer sleeve 1, thereby ensuring that the splicing length of the inner sleeve is greater than the length of the outer sleeve;

s5: filling a stope, wherein slurry flows into the inner sleeve 2 through the outer sleeve notch and the inner sleeve notch, the inner sleeve 2 is drawn back and forth through manpower or a winch in the filling process, and the filling degree of the slurry in the inner sleeve is observed in the drawing process until the outermost inner sleeve is filled with the slurry;

s6: inserting the cover plate, and slowly pushing the cover plate 5 along the inner sleeve chute 10 until the filling height exceeds the height of the outer sleeve until the cover plate is pushed to the bottom;

s7: according to the sampling design requirement, extracting the inner sleeve before the slurry is initially set to obtain in-situ slurry; or maintaining in-situ maintenance, and after 3 days, extracting the inner sleeve to obtain the cemented filling bodies at different positions.

In S7, when maintaining in-situ maintenance, the inner sleeve is pulled once every 6-8 h to ensure smooth sliding of the inner sleeve until the inner sleeve is finally and completely taken out.

The following description is made with reference to specific embodiments.

First, the device design is performed.

The device comprises three parts, namely an outer sleeve, an inner sleeve and a cover plate.

(1) Description of the outer casing

The outer sleeve is processed into a square section shape with the side length of 200-300 mm, and is processed by adopting a thin-wall steel plate with the thickness of 1-3 mm. According to the sampling design requirement, the outer sleeve can be processed into different lengths, the outer sleeve can be processed by adopting the same steel plate in the length direction, if a plurality of steel plates have to be spliced, welding is adopted, and the flatness of the inner side of the outer sleeve is ensured.

During processing, a notch with the length of 20 mm-30 mm is reserved at the middle position of one side of the outer sleeve, but a notch with the length of 300 mm-500 mm is reserved at one end of the inner side of the stope, and the end part is sealed. The outer side end of the stope extends out of the filling retaining wall by 200-300 mm, and the end is completely opened. In the course of working, respectively in all the other trilateral intermediate positions welding semicircular guide rail, 4 ~ 6mm of guide rail wall thickness, the internal diameter is greater than 12mm, adopts nonrust steel pipe preparation, and inside should do polishing treatment, during the welding, should guarantee that the guide rail is straight, is in the intermediate position, should keep same root guide rail on the length direction, if have to adopt the concatenation of multistage guide rail, should guarantee the level and smooth, continuous and smooth of concatenation department, avoid appearing unsmooth undulation. The semicircular guide rail penetrates through the whole outer sleeve.

(2) Inner sleeve

The inner sleeve is made of a thin-wall steel plate, the wall thickness is 0.5-2 mm, and the section of the inner sleeve is irregular. Wherein the three sides have the same size and are 180-280 mm. The last edge is provided with a notch with the size of 300 mm-400 mm, and the size of the notch is larger than the notch reserved on the outer sleeve. The steel plates on the two sides of the notch are bent upwards in an inclined mode, and the highest point of the inclined edge is in contact with the inner wall of the outer sleeve after the inner sleeve is installed into the outer sleeve. The bevel edge low points and the two side edges are respectively processed into two sliding grooves, the depth of each sliding groove is 5-10 mm, and the height of each sliding groove is 1-5 mm.

The processing length of the inner sleeve is 1m, one end part of the inner sleeve is welded and closed by adopting a steel plate with the same specification, and the other end part of the inner sleeve is opened. When the sealing device is closed, the end part cross section is ensured to be flat and smooth, the size of the end part back plate is consistent with that of the square area of the cross section, and sealing rubber is pasted along the edge positions of the end part cross sections at two sides. And respectively welding bolt connecting plates at four corner positions outside the square area of the cross section, wherein the thickness of each connecting plate is more than or equal to 2mm, the side length is 10-20 mm, and the diameter of a bolt opening is 8-16 mm.

The solid optical axis is welded at the middle line position of the side length of the square area of the section of the inner sleeve to serve as a sliding rail, the size of the optical axis is matched with the semicircular guide rail at the inner side of the outer sleeve, the diameter of the optical axis is smaller than the inner diameter of the semicircular guide rail, and when the inner sleeve is inserted into the outer sleeve, the trilateral guide rails are in full contact with the semicircular guide rails and are located at the center of the sliding rail. The slide rail on one side of the same inner sleeve pipe is manufactured by adopting the same optical axis, so that the optical axis is ensured to be positioned at the central line position of each side and is required to be straight. The two ends of the same sliding rail are processed into round heads and polished.

(3) Cover plate

The cover plate is made of a steel plate, and the thickness of the cover plate is 0.5-4 mm. The width of the cover plate is 189-289 mm, and the cover plate can be just inserted into the sliding groove in the upper part of the inner sleeve.

Secondly, the device has the following specific application method:

leveling a field, cleaning pumice of a bottom plate, and ensuring that the bottom plate is level and firm as much as possible; and designing a sampling scheme, and determining the sampling depth, the sampling time and the sampling type.

Constructing a steel plate bracket. The L-shaped steel plate bracket is made of steel plates, the thickness of each steel plate is larger than 4mm, the length of a long side is 1-2 m, and the length of a short side is 100-200 mm. The L-shaped steel plate brackets are arranged in pairs, and the distance between each pair of brackets is the same as the size of the outer wall of the outer sleeve. According to the length of the outer sleeve, a pair of supports are arranged at intervals of 1-5 m, the supports are arranged along a straight line in the length direction, and the turning phenomenon cannot occur. The short side is fixed on the bottom plate by adopting a bottom plate fixing expansion bolt, the expansion bolt is selected from the specification of M20-M30, and the length is 300 mm-400 mm.

Arranging an outer sleeve. One side of the outer sleeve notch is positioned at the top, the outer sleeve is arranged inside each pair of steel plate supports and is in welded connection with the supports, and the height is flexibly adjusted according to sampling design requirements and the height of the supports. During welding, the outer sleeve pipe must be ensured to be in the same plane and kept straight. And after the arrangement is finished, coating lubricating oil on the inner side of the sliding rail. When the retaining wall is arranged, the outer sleeve extends out of the retaining wall by the length of 200 mm-300 mm.

Fourthly, inserting the inner sleeve. Firstly, lubricating oil is smeared on the surface of a slide rail on the outer side of an inner sleeve, demoulding oil is smeared on the inner side pipe wall of the inner sleeve, then the slide rails on the three sides are aligned with a guide rail in an outer sleeve, the slide rails are slowly pushed into a first inner sleeve, then the slide rails are connected with a second inner sleeve by bolts, the closed end is connected with the open end, and the slide rails are screwed down when the slide rails are connected, so that a sealing cushion layer made of sealing rubber at the end part is extruded and tightly contacted. Therefore, the required inner sleeves are connected and pushed into the outer sleeve, and finally the splicing length of the inner sleeves is at least 200mm greater than that of the outer sleeve.

And fifthly, filling the stope, wherein the slurry flows into the inner sleeve through the notch, and in the filling process, the inner sleeve is drawn forwards and backwards through manpower or a winch, wherein the drawing amplitude is 300-500 mm and is smaller than the sealing length of the end part at the inner side of the outer sleeve. And observing the filling degree of the slurry in the inner sleeve in the pumping process until the outermost inner sleeve is filled with the slurry.

Inserting cover plate. And after the filling height exceeds the height of the outer sleeve, slowly pushing the cover plate along the inner sleeve chute until the cover plate is pushed to the bottom.

Seventhly, taking out the inner sleeve

Depending on the sampling design requirements, the inner casing can be withdrawn prior to the initial setting of the slurry to obtain an in situ slurry. And maintaining in-situ maintenance, and after 3 days, drawing out the inner sleeve to obtain cemented filling bodies at different positions, wherein the inner sleeve is drawn out once every 6-8 h during in-situ maintenance to ensure smooth sliding of the inner sleeve until the inner sleeve is finally and completely taken out.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.