Assembled slurry storage device for filling underwater deep confined space and assembly method thereof

Abstract

The present invention discloses an assembled slurry storage device for filling a deep underwater enclosed space, comprising a plurality of slurry storage device units connected end to end, each of the slurry storage device units comprising: a tube body having an axially connected cavity; two plug assemblies, respectively arranged at the two ends of the cavity, each of the plug assemblies being used to close or unidirectionally open one end of the cavity. The present invention also provides an assembly method for an assembled slurry storage device for filling a deep underwater enclosed space. The advantages of the present invention include: by filling independent assembled slurry storage devices on the ground, and then connecting the assembled slurry storage devices end to end and lowering them into a hole, the contact between the slurry and the water is effectively blocked, thereby solving the problem that the slurry cannot be transported in an underwater environment.

Description

Technical Field

[0001] The invention belongs to the technical field of underground goaf management, and in particular relates to an assembled slurry storage device for filling a deep underwater enclosed space and an assembly method thereof. Background Art

[0002] Goaf refers to the mining space formed underground after underground resources are mined. Depending on the type of ore mined and the mining method, the roof of the goaf exhibits different failure modes, and the surface also produces different deformation characteristics. For example, when the full-sinking method is used for mining, the roof of the ore body will continue to collapse as the mining area expands, thus forming a collapse basin on the surface. The destruction of the surface occurs immediately after the mining of the ore body; while when the non-full-sinking method (room-and-pillar) is used for mining, the roof of the ore body is relatively stable. When the pillar is stable, the ground will not collapse. However, with the expansion of the mining area (mining height), the infiltration of groundwater, the weathering of the pillar, etc., when the pillar becomes unstable, the roof will suddenly collapse, causing a sudden collapse of the ground.

[0003] When construction activities are to be carried out in the goaf affected area, the goaf below it needs to be managed first. There are different management methods according to the depth and mining thickness of the goaf. When managing goaf with large mining area and deep mining area, grouting filling is the main means of managing goaf.

[0004] At present, the technologies in domestic and foreign filling management are relatively mature, and many advanced filling management technologies have been developed according to the different conditions of different mines. In the field of goaf management, the slurry can be divided into thin slurry and thick slurry according to the fluidity of the slurry. The thin slurry is mainly composed of fly ash and cement, and the particle size of the grouting material is small. The slurry is transported in a homogeneous flow process, which is suitable for treating areas with smaller voids; the thick slurry is mainly composed of tailings, sand, gravel, and cement. The particle size of the grouting material is large, and the slurry is transported in a non-homogeneous flow process, which is suitable for treating areas with larger voids.

[0005] At present, the treatment of underground goafs is carried out through pipelines. During the transportation process, the slurry is transported to the goaf with the help of gravity potential energy and pumping kinetic energy. The slurry is in a waterless environment during the transportation process. Only in this way can the properties of the slurry be guaranteed not to change during the transportation process. This greatly limits the scope of treatment of the goaf.

[0006] When there is water in the goaf and the slurry transportation distance is long, water will have a great impact on the properties of the slurry. For thin slurry, such as slurry composed of fine particles such as cement and fly ash, the addition of water will greatly dilute the original slurry concentration, reduce the stone rate and stone strength, and affect the grouting effect; for thick slurry, such as concrete and mortar, the addition of water will cause the slurry to segregate and cause pipe blockage, making it impossible to deliver the slurry to the area to be treated. For paste materials, water will cause the slurry to disperse directly and lose fluidity.

[0007] Therefore, when the goaf is filled with groundwater, how to transport the stirred slurry to the goaf is an urgent problem to be solved. Summary of the invention

[0008] An embodiment of the present invention provides an assembled slurry storage device for filling a deep underwater enclosed space and an assembly method thereof, which are used to solve the problems of the prior art, including:

[0009] In one embodiment, a prefabricated slurry storage device for filling a deep underwater enclosed space is provided, comprising a plurality of slurry storage devices connected end to end.

[0010] Each of the slurry storage units comprises:

[0011] A tube body having an axially communicating cavity;

[0012] Two plug assemblies are respectively arranged at two ends of the cavity, and each of the plug assemblies is used to close or unidirectionally open one end of the cavity.

[0013] In one embodiment, a method for assembling an assembled slurry storage tank for filling a deep underwater enclosed space is provided, comprising:

[0014] s1. Drill holes above the goaf as grouting channels;

[0015] s2. A plug is provided at the bottom of the slurry storage unit to seal the slurry into the cavity and the top of the cavity is sealed by the plug;

[0016] s3, the slurry storage units are connected in sequence from top to bottom;

[0017] s4, sending the connected slurry storage device into the grouting channel;

[0018] s5. Connect the grouting pipe with the top of the slurry reservoir, pour the prepared slurry into it, and under the action of the grouting pressure, the plug will be flushed open and continuous grouting will be achieved.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Solve the problem of slurry transportation in underwater environment. When there is water in the goaf and the slurry is transported over a long distance, water will have a great impact on the properties of the slurry. The addition of water will greatly dilute the original slurry concentration, reduce the stone rate and stone body strength, and even cause the slurry to separate and disintegrate during transportation, causing pipe blockage, making it impossible for the slurry to be transported to the area to be treated. The present invention effectively blocks the contact between the slurry and water by filling independent assembled slurry storage tanks on the ground, and then connects each assembled slurry storage tank end to end and lowers it into the hole, thus solving the problem that the slurry cannot be transported in an underwater environment.

[0021] 2. It solves the problems of segregation of slurry during long-distance vertical transportation, which in turn causes pipe blockage and inability to transport slurry. The assembled slurry storage tanks are relatively independent units, each about 3 meters long. During the installation process, the slurry in each unit is in a static state, which effectively solves the problem of slurry deterioration during long-distance vertical transportation.

[0022] 3. Before grouting, it is usually necessary to decide whether a steel pipe needs to be lowered into the borehole for protection based on the integrity of the borehole wall. Be careful to prevent the borehole wall from falling off when the cracks in the borehole wall are relatively developed, which may cause the borehole wall to block and cause a hole blockage accident. At the same time, the friction between the slurry and the borehole wall will increase the slurry delivery pressure and reduce the construction efficiency. The present invention uses an assembled slurry storage tank as a storage and transportation channel for the slurry, allowing the slurry to circulate in the assembled slurry storage tank. In addition to reducing the impact of the instability of the borehole wall on grouting, it effectively reduces the pipe resistance during the slurry delivery process and further improves the grouting efficiency.

[0023] 4. It solves the problem of slurry filling in underwater confined spaces. In confined underwater goaf spaces, due to the saturated state of the underground space, during the grouting process, the pressure in the goaf is relatively high, which often leads to the inability to inject slurry. This method effectively reduces the grouting pressure by constructing pressure relief holes, solving the problem of the inability to inject slurry into underwater confined spaces. At the same time, the pressure relief holes can also be used as detection and supplementary grouting holes, further improving the quality of grouting construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a structural diagram of an assembled slurry storage device used for filling a deep underwater enclosed space in one embodiment of the present application;

[0026] Figure 2A structural diagram of a slurry storage unit of an assembled slurry storage device for filling a deep underwater enclosed space in one embodiment of the present application;

[0027] Figure 3 It is a detailed longitudinal section view of a slurry storage unit of an assembled slurry storage for filling a deep underwater enclosed space in one embodiment of the present application;

[0028] Figure 4 is a structural diagram of a plug in one embodiment of the present application;

[0029] Figure 5 is a longitudinal cross-sectional view of a plug in one embodiment of the present application;

[0030] Figure 6 is a top view of a plug in one embodiment of the present application;

[0031] Figure 7 is a structural diagram of a plug in one embodiment of the present application;

[0032] Figure 8 is a longitudinal cross-sectional view of a plug in one embodiment of the present application;

[0033] Fig. 9 is a top view of a plug in one embodiment of the present application;

[0034] Fig.10 This is an assembly flow chart of an assembled slurry storage device for filling a deep underwater enclosed space in one embodiment of the present application;

[0035] Fig.11 This is a construction flow chart for filling a deep underwater confined space in one embodiment of the present application. DETAILED DESCRIPTION

[0036] The present invention will be more fully understood through the following detailed description, which should be read in conjunction with the accompanying drawings. Detailed embodiments of the present invention are disclosed herein; however, it should be understood that the disclosed embodiments are only exemplary of the present invention, which can be embodied in various forms. Therefore, the specific functional details disclosed herein should not be interpreted as limiting, but only as the basis of the claims and as a representative basis for teaching those skilled in the art to adopt the present invention in different ways in virtually any appropriate detailed embodiment.

[0037] The present invention provides an assembled slurry storage device for filling a deep underwater confined space, comprising a plurality of slurry storage devices connected end to end.

[0038] Each of the slurry storage units comprises:

[0039] A tube body having an axially communicating cavity;

[0040] Two plug assemblies are respectively arranged at two ends of the cavity, and each of the plug assemblies is used to close or unidirectionally open one end of the cavity.

[0041] The plug assembly comprises:

[0042] A plug, which is fixed to the inner wall of the tube body and has a slurry inlet and outlet;

[0043] A plug matched with the plug is made of elastic material, which seals the slurry inlet and outlet and can open the slurry inlet and outlet after being subjected to a set axial pressure.

[0044] Furthermore, the two adjacent slurry storage units are connected via threads.

[0045] Furthermore, the plug is matched with the inner wall of the tube body by means of threads.

[0046] Furthermore, an annular step portion is formed around the slurry inlet and outlet, and the plug is supported on the step portion.

[0047] Furthermore, the plug includes a base supported on the step portion and a sealing portion protruding into the slurry inlet and outlet.

[0048] Furthermore, annular step portions are formed on both axial sides of the slurry inlet and outlet, and the plug can be supported on the step portions.

[0049] Furthermore, the plug is made of elastic material such as rubber or silicone.

[0050] In the above technical solution, the present invention adopts an assembled slurry storage tank, and the stirred slurry is stored in the slurry storage tank by arranging upper and lower plugs (rubber pads).

[0051] Furthermore, a retarder is added to the slurry in the slurry reservoir according to the time of filling and lowering the slurry reservoir into the borehole.

[0052] In the above technical solution, plugs are installed from bottom to top on the plug at the lower end of the lowest slurry reservoir unit so that it can withstand the groundwater pressure from the lower part of the slurry reservoir to prevent groundwater from entering the slurry reservoir. Plugs are installed on the remaining slurry reservoir units to isolate the internal slurry from the external groundwater and ensure that the pressure in the pipe is not affected by the surrounding water pressure. Retarder is added to the slurry in the slurry reservoir to prevent the slurry from solidifying in the slurry reservoir.

[0053] In the above technical scheme, the present invention connects the slurry storage unit end to end, lowers it into the bottom of the hole, connects the external grouting pipe of the grouting pump, and flushes the (plug) rubber pad under high pressure, thereby injecting the slurry into the goaf, achieving the purpose of transporting the slurry in water.

[0054] The present invention provides an assembly method of an assembled slurry storage device for filling a deep underwater enclosed space, comprising:

[0055] s1. Drill holes above the goaf as grouting channels;

[0056] s2. A plug is provided at the bottom of the slurry storage unit to seal the slurry into the cavity and the top of the cavity is sealed by the plug;

[0057] s3, the slurry storage units are connected in sequence from top to bottom;

[0058] s4, sending the connected slurry storage device into the grouting channel;

[0059] s5. Connect the grouting pipe with the top of the slurry reservoir, pour the prepared slurry into it, and under the action of the grouting pressure, the plug will be flushed open and continuous grouting will be achieved.

[0060] Furthermore, in step s1, it also includes constructing a water outlet hole connected to the goaf.

[0061] Furthermore, in step s5, while grouting is being performed in the grouting hole, groundwater automatically overflows or is pumped out of the water outlet hole by a pump.

[0062] Furthermore, in step s5, when slurry overflows from the water outlet, grouting is stopped.

[0063] In the above technical scheme, the present invention adopts the method of constructing two boreholes s1 and s2 above the goaf (hole s1 is a borehole for grouting, serving as a channel for grouting; hole s2 is a pressure reducing hole, used to solve the problem that the slurry cannot be injected due to increased water pressure during the grouting process of hole s1), connecting the slurry storage unit end to end in hole s1, lowering it to the bottom of the hole, connecting the grouting pipe to the slurry storage unit, and then pouring the configured slurry into the well to achieve the purpose of treating deep underwater goaf.

[0064] Embodiment 1:

[0065] refer to Figure 1 , Figure 2 , Figure 3 As shown, a specific embodiment of the present application provides an assembled slurry storage device for filling a deep underwater enclosed space, including a plurality of slurry storage units connected end to end, each slurry storage unit includes a pipe body 1, a plug 2 and a plug 3, and each slurry storage unit is relatively independent and detachably threaded.

[0066] The length of the tube body 1 is about 3 meters, and it is preferably cylindrical. It is hollow inside and has a cavity with the same axial direction. The cylindrical shape is intended to fit the drilled hole and facilitate up and down movement in the drilled hole. The tube body 1 includes a first port and a second port. The inner wall of the first port of the tube body 1 is provided with an internal thread 11, and an annular boss 13 is provided below the internal thread 11. The surface of the annular boss 13 is also provided with a thread 131 to facilitate the threaded connection between the plug 2 and the tube body.

[0067] In other technical files, the plug 2 can also be fixed to the inner wall of the pipe body by welding or other methods.

[0068] An external thread 12 is provided on the outer wall of the second port of the pipe body 1 , and an annular boss is also provided on the inner wall of the pipe body above the external thread 12 for mounting the plug 2 .

[0069] The diameter of the first port of the pipe body 1 is slightly larger than the diameter of the second port, and the first port of one slurry storage pipe body can be threadedly connected with the second port of another slurry storage pipe body.

[0070] In other technical solutions, the pipe diameters and internal and external threads of the first port and the second port may be arranged alternately, as long as the threaded connection is achieved.

[0071] In other specific embodiments, the multiple slurry storage units may be detachably connected to each other by means of snaps or the like.

[0072] refer to Figure 4 , Figure 5 and Figure 6 As shown, the plug 2 is arranged at both ends of the cavity of the tube body 1. The plug 2 is hollow and round, and is provided with a slurry inlet and outlet. A thread 21 is provided on the outer wall of the plug 2, which is convenient for threaded connection with the inner boss 13 of the tube body 1. A step portion 22 is provided in an annular shape on the inner wall of the plug 2. The step portion 22 is used to support the plug 3 so that the plug 3 is engaged with the step portion 22.

[0073] refer to Figure 7 , Figure 8 and Fig. 9 As shown, the plug 3 is in an inverted T shape, including a base 31 supported on the step portion 22 and a sealing portion 32 protruding into the slurry inlet and outlet, which is compatible with the plug 2 and can be engaged with the plug 2 from above or below. The plug 3 can be made of an elastic material such as soft plastic or rubber silicone, and has a certain elasticity and telescopic force.

[0074] refer to Fig.10 , Fig.11 As shown, the present invention provides an assembly method of an assembled slurry storage device for filling a deep underwater enclosed space, comprising:

[0075] s1. Drill holes above the goaf as grouting channels;

[0076] s2. A plug is provided at the bottom of the slurry storage unit to seal the slurry into the cavity and the top of the cavity is sealed by the plug;

[0077] s3, the slurry storage units are connected in sequence from top to bottom;

[0078] s4, sending the connected slurry storage device into the grouting channel;

[0079] s5. Connect the grouting pipe with the top of the slurry reservoir, pour the prepared slurry into it, and under the action of the grouting pressure, the plug will be flushed open and continuous grouting will be achieved.

[0080] Further, a plug is installed on the plug at the lower end of the lowest slurry storage unit from bottom to top, and plugs are installed on the upper and lower ends of the remaining slurry storage units from top to bottom. Figure 1 shown.

[0081] Furthermore, in step s1, it also includes constructing a water outlet hole connected to the goaf.

[0082] Furthermore, in step s5, while grouting is being performed in the grouting hole, groundwater automatically overflows or is pumped out of the water outlet hole by a pump.

[0083] Furthermore, in step s5, when slurry overflows from the water outlet, grouting is stopped.

[0084] Furthermore, depending on the time of filling and lowering the slurry reservoir into the borehole, a retarder is added to the slurry in the slurry reservoir.

[0085] The assembled slurry storage device and construction method of the present invention are aimed at the following working conditions: when the depth of the goaf to be treated is large and the groundwater level is high, the grouting pressure required during the grouting process is greater. When the goaf is a relatively closed space, the slurry may not be injected. Therefore, two boreholes s1 and s2 are constructed above the goaf (the s1 hole is a borehole for grouting, which serves as a grouting channel; the s2 hole is a pressure reducing hole, which is used to solve the problem that the slurry cannot be injected due to increased water pressure during the grouting process of the s1 hole). The slurry storage devices are connected one by one in the s1 hole and lowered into the bottom of the hole, the grouting pipe is connected to the orifice steel pipe, and then the configured slurry is poured into the well to achieve the purpose of treating the deep underwater goaf.

[0086] The specific construction method of the present invention is:

[0087] 1. Design the plan layout and drilling structure of the drilling holes in combination with the distribution characteristics of the goaf area of ​​the proposed site, the surrounding environmental conditions and the characteristics of the buildings and structures.

[0088] 2. Fill the slurry reservoir, install the plug at the lower end of the slurry reservoir from top to bottom, pour the slurry into the slurry reservoir, and then install the plug at the upper end of the slurry reservoir from top to bottom, fill the slurry reservoir that matches the designed depth of the drilling hole, install the plug at the lower part of the lowest slurry reservoir from bottom to top, and be careful to prevent groundwater from entering the slurry reservoir. According to the time of filling and lowering the slurry reservoir into the borehole, add an appropriate amount of retarder to the slurry to prevent the slurry from solidifying in the slurry reservoir.

[0089] 3. During the construction of grouting hole s1, the borehole structure is designed to change diameter 2 to 3 times from the hole mouth to the hole bottom according to the drilling depth and the strength of the rock and soil mass, that is, the borehole diameter is gradually reduced by 2 to 3 levels from top to bottom. After drilling in the soil layer and weathered rock to a certain depth below the bedrock surface, a protective pipe is inserted to prevent the hole wall from collapsing. The borehole diameter is reduced to continue to pass through the top plate of the goaf, and the drilling imaging instrument is inserted to measure the height of the goaf and the degree of cracks in the overlying rock mass of the goaf.

[0090] 4. Construct pressure relief hole s2. According to the drilling depth and the strength of the rock and soil, the drilling structure is designed to change diameter 2 to 3 times from the hole mouth to the bottom of the hole, that is, the borehole diameter is gradually reduced by 2 to 3 levels from top to bottom. After drilling to a certain depth below the bedrock surface in the soil layer and weathered rock with a large borehole, a protective pipe is inserted to prevent the hole wall from collapsing. The borehole diameter is reduced to continue to pass through the top plate of the goaf, and the drilling imaging instrument is inserted to measure the height of the goaf.

[0091] 5. Lower the slurry storage device into the s1 grouting hole one by one.

[0092] 6. Connect the grouting pipe to the slurry storage device in the lower hole, and then inject the prepared slurry into the well. During the injection process, monitor the water gushing from the S2 hole. When the injection pressure of S1 increases, place a water pump in the S2 hole to pump out water to reduce the grouting pressure of the S1 hole.

[0093] 7. When the grouting reaches the design requirements or slurry overflows from S2, stop grouting. At this time, put the drill bit into the S2 borehole to measure the remaining height of the goaf. When the pores in the goaf are large, increase the S1 grouting pressure and continue grouting to the design requirements. When the pores in the remaining mined area are small, inject cement slurry into the S2 hole through the drill pipe to the bottom of the hole, and stop grouting when cement slurry emerges from the hole mouth.

[0094] 8. Mark the drilling position. After the slurry solidifies, the S2 borehole can be used as a test hole to conduct core sampling tests on samples in the goaf.

[0095] Example 2

[0096] In this embodiment, the plug assembly adopts a one-way valve, through which the slurry can only be poured into the goaf from the outside, while preventing the groundwater in the goaf from infiltrating into the pipe.

[0097] The outer side of the one-way valve is provided with an external thread surface which is rotatably matched with the plug. The external thread surface can be formed on an annular sleeve body which is sleeved and fixed on the outer side of the one-way valve.

[0098] The outer thread surface of the sleeve body can be rotationally matched with the plug 2, or can be directly rotationally matched with the inner wall surface of the tube body.

[0099] The one-way valve can be purchased directly on the market, and its principle and structure will not be described in detail.

[0100] Although the present invention has been described with reference to illustrative embodiments, it will be appreciated by those skilled in the art that various other changes, omissions and / or additions may be made without departing from the spirit and scope of the present invention and that the elements of the embodiments may be replaced by substantial equivalents. In addition, many modifications may be made without departing from the scope of the present invention to adapt specific circumstances or materials to the teachings of the present invention. Therefore, it is not intended herein to limit the present invention to the disclosed specific embodiments for performing the present invention, but it is intended that the present invention will include all embodiments within the scope of the appended claims. In addition, unless specifically stated, any use of the terms first, second, etc. does not indicate any order or importance, but rather uses the terms first, second, etc. to distinguish one element from another.

Claims

1. An assembled slurry storage tank for filling a deep underwater enclosed space, characterized in that: It includes multiple slurry storage units connected end to end. Each of the slurry storage units comprises: A tube body having an axially communicating cavity; Two plug assemblies are respectively arranged at two ends of the cavity, and each of the plug assemblies is used to close or unidirectionally open one end of the cavity; The plug assembly comprises: A plug, which is fixed to the inner wall of the tube body and has a slurry inlet and outlet; a plug matched with the plug, the plug is made of elastic material, seals the slurry inlet and outlet, and opens the slurry inlet and outlet after receiving a set axial pressure; Two adjacent slurry storage units are connected by threads; The stirred slurry is stored in the slurry storage tank by setting a plug, the slurry storage tank unit is connected end to end, lowered into the bottom of the hole, connected to the external grouting pipe, and the plug is flushed open under the grouting pressure, so that the slurry is injected into the goaf, achieving the purpose of transporting the slurry in water.

2. The assembled slurry storage device for filling a deep underwater enclosed space according to claim 1, characterized in that: An annular step portion is formed around the slurry inlet and outlet, and the plug is supported on the step portion.

3. The assembled slurry storage device for filling a deep underwater enclosed space according to claim 2, characterized in that: The plug includes a base supported on the step portion and a sealing portion protruding into the slurry inlet and outlet.

4. The assembled slurry storage device for filling a deep underwater enclosed space according to claim 1, characterized in that: Annular step portions are respectively formed on both axial sides of the slurry inlet and outlet, and the plug is supported on the step portions.

5. The assembled slurry storage device for filling a deep underwater enclosed space according to claim 1, characterized in that: The plug is matched with the inner wall of the tube body by means of threads.

6. The assembled slurry storage device for filling a deep underwater enclosed space according to claim 1, characterized in that: The plug is a one-way valve.

7. An assembly method of an assembled slurry storage device for filling an underwater deep enclosed space according to any one of claims 1 to 6, characterized in that: include: s1. Drill holes above the goaf as grouting channels; s2. A plug is provided at the bottom of the slurry storage unit to seal the slurry into the cavity and the top of the cavity is sealed by the plug; s3, the slurry storage units are connected in sequence from top to bottom; s4, sending the connected slurry storage device into the grouting channel; s5. Connect the grouting pipe with the top of the slurry reservoir, pour the prepared slurry into it, and under the action of the grouting pressure, the plug will be flushed open and continuous grouting will be achieved.

8. The method for assembling an assembled slurry storage device for filling an underwater deep enclosed space according to claim 7, characterized in that: In s1, it also includes the water outlet hole connected with the goaf during construction.

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