A cave filling construction method

Abstract

This application discloses a cave filling construction method. First, the filling area is scanned to determine the location and size of the cave. Second, based on the location and size of the cave, multiple grouting pipes are inserted along the edge of the filling area, with the lower ends of the grouting pipes connected to the upper part of the cave. Double-liquid grouting is performed into the cave through the grouting pipes. The reactants of the injected double-liquid slurry gradually accumulate from the bottom of the cave to the top of the cave, forming a sealing curtain along the edge of the filling area. Finally, after the sealing curtain is formed, holes are drilled into the cave within the filling area and filling material is poured until the cave within the filling area is completely filled with the filling material. This application has the effect of reducing the amount of filling material used in cave treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of karst cave construction, in particular to a karst cave filling construction method. Background Art

[0002] Karst areas are geologically hazardous areas, with numerous underground karst caves. The geological conditions are generally complex, and the impacts and hazards they create are often significant. Therefore, when undertaking construction in karst areas, cave treatment is necessary. Currently, grouting is the common method for treating caves. However, when the distribution of caves is larger than the area to be constructed, grouting requires a large amount of cement slurry, which is costly.

[0003] Regarding the above-mentioned related technologies, the applicant believes that there are the following defects: when the distribution range of the caves is larger than the area where construction is required, the grouting volume is large and the cost is high. Summary of the Invention

[0004] In order to reduce the amount of filling materials used in cave treatment and lower the cost of cave treatment, the present application provides a cave filling construction method.

[0005] The present application provides a cave filling construction method using the following technical solutions:

[0006] A cave filling construction method comprises the following steps:

[0007] Survey the terrain: Scan the infill area to determine the location and size of the caves;

[0008] Grouting edge sealing: Based on the location and size of the cave, multiple grouting pipes are driven in at intervals along the edge of the filling area, with the lower ends of the grouting pipes connected to the upper part of the cave. Double-liquid grouting is performed into the cave through the grouting pipes, and the reactants of the injected double-liquid slurry gradually pile up from the bottom of the cave to the top of the cave, forming a circle of edge sealing curtain along the edge of the filling area;

[0009] Grouting filling: After the edge curtain is formed, holes are drilled into the cavities in the filling area and filling materials are poured until the filling materials fill the cavities in the filling area.

[0010] By adopting the above technical solution, water glass and calcium chloride solution are alternately injected into the cave by using the double-liquid grouting method, and the two solutions react rapidly to generate silica gel and calcium silicate gel, which gradually pile up under the grouting pipe until the top of the cave. While piling up, the width of the stack of silica gel and calcium silicate gel gradually increases, and finally comes into contact with the silica gel and calcium silicate gel generated by the double-liquid slurry injected by the adjacent grouting pipe, so that the double-liquid slurries injected by the adjacent grouting pipes are connected, forming a circle of edge-sealing curtain along the edge of the filling area to prevent the filling material in the filling area from leaking out. During grouting filling, only the area surrounded by the edge-sealing curtain needs to be filled, thereby reducing the amount of filling material used and reducing the treatment cost of the cave.

[0011] Preferably, after the grouting and edge sealing is completed, grouting and edge sealing are performed again on the outside of the edge sealing curtain to form an outer curtain, and then grouting holes are drilled between the outer curtain and the edge sealing curtain, and then sealing slurry is injected through the grouting holes in multiple times until the sealing slurry emerges from the upper end of the grouting hole and the liquid level is higher than the upper part of the cave for two consecutive hours.

[0012] By adopting the above technical solution, grouting is performed on the outside of the edge-sealing curtain to form an outer curtain, and grouting is performed between the outer curtain and the edge-sealing curtain. This can seal the edge-sealing curtain, improve the sealing performance of the edge-sealing curtain, and reduce the amount of filling material used in the subsequent grouting and filling steps.

[0013] Preferably, the sealing slurry is mixed with a plugging unit, and the plugging unit is suspended in the sealing slurry.

[0014] By adopting the above technical solution, when the sealing slurry leaks from the gaps on the edge curtain and the gaps on the outer curtain, the sealing unit is suspended in the sealing slurry and flows toward the gaps, and will eventually be sealed in the gaps, preventing the sealing slurry from continuing to leak, reducing the amount of sealing slurry used, and at the same time improving the sealing efficiency of the edge curtain.

[0015] Preferably, the blocking unit comprises a plurality of blocking blocks and a net structure, the blocking blocks are installed on the net structure at intervals, and the plurality of blocking blocks are arranged at intervals.

[0016] By adopting the above technical solution, the mesh structure connects multiple blocking blocks, increasing the area of ​​the blocking unit, thereby improving the blocking efficiency; and the mutual pulling effect between the multiple blocking blocks can reduce the probability of the blocking blocks flowing out of the gap.

[0017] Preferably, the plurality of blocking blocks are of different sizes.

[0018] By adopting the above technical solution, blocking blocks of different sizes can block gaps of different sizes; and after the small blocking blocks flow out of the gaps, they will pull other blocking blocks to move into the gaps until the large blocking blocks block the gaps, thereby improving the blocking efficiency and effect of the gaps.

[0019] Preferably, when there are multiple caves stacked up and down, the bottom cave is first grouting and sealing, and then the grouting pipe is lifted to the top of the next cave below, and the next cave below is grouting and sealing, and the cycle is repeated, grouting and sealing each cave in turn upwards; the grouting filling is filled from bottom to top.

[0020] By adopting the above technical solution, construction is carried out from bottom to top, and the same grouting pipe can be used for grouting, which reduces costs; and when grouting, the gaps that may be generated after the solidification of the lower cave can be filled when filling the upper cave.

[0021] Preferably, in the grouting and edge sealing step, the grouting pipes are divided into two rows, and an inflation plate is used to assist double-liquid grouting. The upper end of the inflation plate is connected to an inflation pipe, and the inflation pipe is sleeved in the grouting pipe. The inflation pipe is provided with an inner hole for grouting, and there is a filling space between the two rows of inflation plates.

[0022] By adopting the above technical solution, a filling space is provided between the inflatable plates, and double-liquid grouting is performed into the filling space, which can reduce the amount of double-liquid grout used.

[0023] Preferably, after the air pressure inflated into the inflatable plate through the inflation tube reaches a set value, the lower end of the inflatable plate abuts the bottom of the cave, the upper end of the inflatable plate abuts the top of the cave, and the inflatable plates in the same row abut in sequence.

[0024] By adopting the above technical solution, two rows of inflatable panels and the bottom and top of the cave are surrounded to form a closed filling space, so that the double slurry injected into the filling space has better sealing with the cave wall, thereby improving the sealing of the edge curtain.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. By using the double-liquid grouting method to alternately inject water glass and calcium chloride solution into the cave, the two solutions react rapidly to form silica gel and calcium silicate gel, which gradually pile up below the grouting pipe until it reaches the top of the cave. As the stacking increases, the width of the silica gel and calcium silicate gel stack gradually increases. Finally, it will come into contact with the silica gel and calcium silicate gel generated by the double-liquid slurry injected from the adjacent grouting pipe, so that the double-liquid slurries injected from the adjacent grouting pipes are connected, forming a circle of edge-sealing curtain along the edge of the filling area, preventing the filling material in the filling area from leaking out. During grouting, only the area surrounded by the edge-sealing curtain needs to be filled, thereby reducing the amount of filling material used and lowering the cost of cave treatment;

[0027] 2. Grouting is performed on the outer side of the edge curtain to form an outer curtain, and grouting is performed between the outer curtain and the edge curtain to seal the edge curtain, improving the sealing performance of the edge curtain and reducing the amount of filling material used in the subsequent grouting and filling steps;

[0028] 3. When sealing slurry leaks from gaps in the edge curtain or the outer curtain, the sealing units float in the sealing slurry and flow toward the gaps, eventually sealing them there. This prevents further leakage, reduces slurry usage, and improves the sealing efficiency of the edge curtain. The mesh structure connects multiple sealing blocks, increasing the area of ​​the sealing units and thus improving sealing efficiency. Furthermore, the mutual pulling action between the multiple sealing blocks reduces the probability of the sealing blocks leaking from the gaps.

[0029] 4. The two rows of inflatable panels and the bottom and top of the cave form a closed filling space, which makes the double slurry injected into the filling space and the cave wall more tightly sealed, thereby improving the sealing performance of the edge curtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a flowchart of a cave filling construction method according to Example 1 of the present application.

[0031] Figure 2 It is a schematic diagram of the distribution of grouting pipes for grouting edge sealing and secondary edge sealing in Example 1 of the present application.

[0032] Figure 3 It is a structural schematic diagram of the grouting edge sealing and secondary edge sealing of Example 1 of the present application.

[0033] Figure 4 It is a structural schematic diagram of the blocking unit of the present application.

[0034] Figure 5 It is a structural diagram of the auxiliary device of this application.

[0035] Description of reference numerals:

[0036] 1. Grouting pipe; 2. Cave; 3. Edge sealing curtain; 4. Outer curtain; 5. Sealing slurry; 6. Grouting hole; 7. Sealing unit; 71. Net structure; 72. Sealing block; 8. Auxiliary device; 81. Inflatable plate; 82. Inflatable pipe; 83. Air nozzle; 84. Inner hole. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-5 This application is described in further detail.

[0038] The embodiment of the present application discloses a cave filling construction method.

[0039] Example 1

[0040] Reference Figure 1 A cave filling construction method comprises the following steps:

[0041] Survey the terrain: Scan the filled area to determine the location, depth and size of Cave 2.

[0042] Grouting edge sealing: refer to Figure 2 and Figure 3 Based on the location, depth, and size of cave 2, a circle of spaced grouting pipes 1 are driven along the edge of the filling area. The distance between adjacent grouting pipes 1 is 0.5m, and the lower ends of the grouting pipes 1 are connected to the upper part of cave 2. Two-liquid grouting is performed into cave 2 through the grouting pipes 1. The reactants of the injected two-liquid slurry gradually rise from the bottom of cave 2 to the top of cave 2, forming a sealing curtain 3 along the edge of the filling area. The two-liquid grouting rate is 5 liters per minute. When the liquid level of the injected two-liquid slurry stabilizes in the grouting pipe, it indicates that the reactants of the two-liquid slurry have reached the top of cave 2.

[0043] Secondary edge banding: refer to Figure 2 and Figure 3 , two meters outside the edge curtain 3, the grouting pipe 1 and grouting edge sealing operations are carried out again to form the outer curtain 4, and then the grouting hole 6 is drilled between the outer curtain 4 and the edge curtain 3, and then the sealing slurry 5 is injected through the grouting hole 6 in multiple times. The interval time for each injection of the sealing slurry 5 is half an hour, and the amount of sealing slurry 5 injected each time is 20 cubic meters. Until the sealing slurry 5 emerges from the upper end of the grouting hole 6, and the liquid level of the sealing slurry 5 is higher than the upper part of the cave 2 for two consecutive hours, the injection of the sealing slurry 5 is stopped. At this time, the outer curtain 4, the edge curtain 3 and the sealing slurry 5 form a circle of water retaining structure in the cave 2 at the edge of the filling area, surrounding the cave 2 in the filling area.

[0044] Grouting filling: After the sealing slurry 5 solidifies, drill holes into the cave 2 in the filling area and pour filling material into it until the cave 2 is filled with the filling material. The filling material is the cement slurry commonly used to fill the cave 2.

[0045] Reference Figure 4, the sealing slurry 5 is made of cement and sand. The sealing slurry 5 is mixed with a sealing unit 7, and the sealing unit 7 is suspended in the sealing slurry 5. The sealing unit 7 includes a plurality of sealing blocks 72 of different sizes and a net structure 71. The net structure 71 is made of a fishing net. The sealing blocks 72 are tied to the net structure 71 at intervals, and the plurality of sealing blocks 72 are arranged at intervals. The sealing blocks 72 are made of hollow balls. The density of the side walls of the hollow balls is basically the same as the density of the sealing slurry 5. A plurality of holes are opened in the side walls of the hollow balls. After the hollow balls enter the sealing slurry 5, the sealing slurry 5 enters the hollow balls through the holes on its wall and keeps the hollow balls suspended in the sealing slurry 5. When the sealing slurry 5 leaks from the gaps on the edge curtain 3 and the gaps on the outer curtain 4, the sealing unit 7 is suspended in the sealing slurry 5 and flows to the gaps, and will eventually be blocked in the gaps to prevent the sealing slurry 5 from continuing to leak. The blocking units 7 may also be some debris such as leaves, branches, etc. suspended or floating in the sealing slurry 5 .

[0046] It should be noted that when there are multiple caves 2 stacked up and down, the lowest cave 2 is first grout-sealed, and then the grouting pipe 1 is lifted to the top of the next cave 2 below, and the next cave 2 is grout-sealed. This cycle is repeated, and each cave 2 is grout-sealed in turn. Similarly, grouting is also carried out from bottom to top.

[0047] The implementation principle of a cave filling construction method in the embodiment of the present application is as follows: utilizing the rapid solidification property of double-liquid grouting, a circle of edge-sealing curtain 3 is first formed along the edge of the filling area to enclose the cave 2 in the filling area, and then a circle of outer curtain 4 is constructed, and sealing slurry 5 is filled between the outer curtain 4 and the edge-sealing curtain 3 to seal the gap in the edge-sealing curtain 3 and improve the sealing performance of the edge-sealing curtain 3, thereby forming a circle of sealing structure surrounding the cave 2 in the filling area. Finally, when filling the cave 2 in the filling area with cement slurry, the edge-sealing enclosure can prevent the filled cement slurry from leaking out, so that the filled cement slurry can all be used to fill the cave 2 in the filling area, thereby reducing the amount of filled cement slurry used and reducing the treatment cost of the cave 2.

[0048] Example 2

[0049] Reference Figure 5, which is different from the first embodiment, in that, during the grouting and edge sealing step, the grouting pipes 1 are divided into two rows, and the two rows of grouting pipes 1 are aligned with each other. An auxiliary device 8 is used to assist the double-liquid grouting. The auxiliary device 8 includes an inflation plate 81. The upper end of the inflation plate 81 is connected to an inflation pipe 82. The inflation pipe 82 is sleeved inside the grouting pipe 1. The inflation pipe 82 is provided with an inner hole 84 for grouting. The inner hole 84 and the inflation plate 81 are staggered in the vertical direction, and there is a filling space between the two rows of inflation plates 81. The side walls of the inflation plate 81 and the inflation pipe 82 are provided with a connected inflation cavity. The upper end of the inflation pipe 82 is provided with a gas nozzle 83 connected to the inflation cavity, and the gas nozzle 83 can be used to inflate the inflation cavity. When the air pressure inflated into the inflatable plate 81 through the inflatable tube 82 reaches the set value, the lower end of the inflatable plate 81 abuts the bottom of the cave 2, and the upper end of the inflatable plate 81 abuts the top of the cave 2. The inflatable plates 81 in the same row abut in sequence. The inflatable plates 81 are made of rubber and are retractable. The height of the inflatable plate 81 is set according to the height of the cave 2 below the grouting pipe 1.

[0050] The implementation principle of the above embodiment is: when in use, the inflation plate 81 is first rolled into a rod shape, and then passed into the cave 2 from the grouting pipe 1. The inflation pipe 82 is arranged in the grouting pipe 1, and then the inflation plate 81 is inflated through the inflation pipe 82. The inflation pressure is 1.1 standard atmospheric pressures. The inflation plate 81 unfolds and expands. When it is impossible to continue to inflate the inflation plate 81, pull the inflation pipe 82 upward to drive the inflation plate 81 to move upward so that the upper end of the inflation plate 81 abuts against the upper wall of the cave 2. Then, gas with a pressure of 1.5 standard atmospheres is filled into the inflatable plate 81 through the inflation tube 82, so that the inflatable plate 81 continues to expand. Finally, the lower end of the inflatable plate 81 abuts against the bottom of the cave 2, and the two side edges of the inflatable plate 81 abut against the inflatable plates 81 on both sides of the same row. The two rows of inflatable plates 81 and the upper and lower walls of the cave 2 form a sealed space. The double-liquid slurry is injected into the sealed space through the inner hole 84. The double-liquid slurry can fill the sealed space, forming a sealing curtain 3 with better sealing effect.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A cave filling construction method, characterized in that: The steps include: Survey the terrain: Scan the filled area to determine the location and size of the cave (2); Grouting edge sealing: according to the position and size of the cave (2), a plurality of grouting pipes (1) are installed at intervals along the edge of the filling area, and the lower ends of the grouting pipes (1) are connected to the upper part of the cave (2); double liquid grouting is performed into the cave (2) through the grouting pipes (1), and the reactants of the injected double liquid slurry are gradually piled up from the bottom of the cave (2) to the top of the cave (2), forming a circle of edge sealing curtain (3) along the edge of the filling area; Grouting filling: After the edge curtain (3) is formed, holes are drilled into the cavities (2) in the filling area and filling materials are poured until the cavities (2) in the filling area are filled with the filling materials; In the grouting and edge sealing step, the grouting pipe (1) is divided into two rows, and an inflation plate (81) is used to assist double-liquid grouting, the upper end of the inflation plate (81) is connected to an inflation pipe (82), the inflation pipe (82) is sleeved in the grouting pipe (1), the inflation pipe (82) is provided with an inner hole (84) for grouting, a filling space is provided between the two rows of the inflation plates (81), the inner hole (84) and the inflation plates (81) are staggered in the vertical direction, and the side walls of the inflation plates (81) and the inflation pipe (82) are provided with a communicating inflation cavity; After the air pressure inflated into the inflation plate (81) through the inflation tube (82) reaches a set value, the lower end of the inflation plate (81) abuts against the bottom of the karst cave (2), and the upper end of the inflation plate (81) abuts against the top of the karst cave (2), and the inflation plates (81) in the same row abut against each other in sequence.

2. A cave filling construction method according to claim 1, characterized in that: After the grouting and edge sealing is completed, grouting and edge sealing are performed again on the outer side of the edge sealing curtain (3) to form an outer curtain (4), and then a grouting hole (6) is drilled between the outer curtain (4) and the edge sealing curtain (3), and then the sealing slurry (5) is injected through the grouting hole (6) until the sealing slurry (5) emerges from the upper end of the grouting hole (6) and the liquid level is higher than the upper part of the cave (2) for two consecutive hours.

3. A cave filling construction method according to claim 2, characterized in that: The sealing slurry (5) is mixed with a plugging unit (7), and the plugging unit (7) is suspended in the sealing slurry (5).

4. A cave filling construction method according to claim 3, characterized in that: The blocking unit (7) comprises a plurality of blocking blocks (72) and a net structure (71); the blocking blocks (72) are installed on the net structure (71) at intervals; and the plurality of blocking blocks (72) are arranged at intervals.

5. A cave filling construction method according to claim 4, characterized in that: The sizes of the plurality of blocking blocks (72) are different.

6. A cave filling construction method according to claim 1, characterized in that: When there are multiple karst caves (2) stacked up and down, the lowest karst cave (2) is first grouting-sealed, and then the grouting pipe (1) is lifted to the top of the next lower karst cave (2), and the next lower karst cave (2) is grouting-sealed. This cycle is repeated, and each karst cave (2) is grouting-sealed in turn upwards; the grouting filling is sequentially filled from bottom to top.

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