Grouting test device for goaf
By designing a test device for simulating the grouting environment in goaf, the problem of difficult prediction of the diffusion law and diffusion radius of grouting materials is solved, and effective data acquisition and prediction of the diffusion situation of grouting materials is achieved, providing data support for goaf governance.
Patent Information
- Application Number
- CN202421115266.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-21
AI Technical Summary
When filling existing drill holes, the diffusion law and diffusion radius of grouting materials in the goaf area are difficult to effectively predict due to the influence of the gap characteristics, burial depth and grouting pressure of the goaf area.
A goaf grouting test device is designed, including a mixing bin, grouting pump, pipeline and test chamber. The test chamber is filled with gravel and a temperature and humidity sensor is buried. The test is conducted by adjusting variables such as grouting pressure, material and flow, and the gap characteristics and grouting environment of the goaf are simulated and the test data are collected.
Through the test of this device, the grouting environment of the goaf can be effectively simulated, and the test data on the diffusion law and diffusion radius of the grouting material can be obtained, providing data support for actual projects and helping to predict the diffusion of grouting materials.
Smart Images
Figure CN222913414U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of drilling grouting, and specifically relates to a goaf grouting test device. Background Art
[0002] After the underground coal seam is mined out, the direct roof rock stratum of the goaf moves and bends downward under the action of its own weight and the overlying rock stratum. When the internal tensile stress exceeds the tensile strength limit of the rock stratum, the direct roof first fractures, breaks, and then collapses successively.
[0003] Adopting drilling grouting filling is an effective means for current goaf treatment. However, the diffusion law and diffusion radius of the grouting material in the goaf are difficult to effectively predict due to the influence of various factors such as the void characteristics, burial depth, and grouting pressure of the goaf. Content of the Utility Model
[0004] The technical problem to be solved by the utility model is that during the existing drilling grouting filling, the diffusion law and diffusion radius of the grouting material in the goaf are difficult to effectively predict due to the influence of various factors such as the void characteristics, burial depth, and grouting pressure of the goaf.
[0005] To solve the above technical problem, the technical solution provided by the utility model is as follows: A goaf grouting test device proposed by the utility model includes a mixing bin, a grouting pump, pipelines, and a test box. A steel pipe is penetrated through the test box. The steel pipe is a perforated pipe with holes all over its body. The test box is filled with crushed stones, and multiple groups of temperature and humidity sensors are evenly buried in the crushed stones. The mixing bin is connected to the grouting pump through a pipeline, the grouting pump is connected to one end of the steel pipe through a pipeline, the other end of the steel pipe is connected to the mixing bin through a pipeline, a butterfly valve is provided at the end of the steel pipe connected to the mixing bin, the end of the steel pipe connected to the grouting pump is the injection end, the end of the steel pipe connected to the mixing bin is the discharge end, and a flow meter and a pressure gauge are arranged on the pipeline connecting the grouting pump and the steel pipe.
[0006] Further, the distance between adjacent two groups of the temperature and humidity sensors is 100 - 300 mm.
[0007] Further, the test box is a steel rectangular box with square end faces.
[0008] Preferably, the length, width, and height of the test box are 3 m × 2 m × 2 m.
[0009] Further, the steel pipe is arranged at the center of the test box, and both ends of the steel pipe are respectively located at the center positions of the two square faces on both sides of the test box.
[0010] Compared with the prior art, the utility model specifically has the following advantages:
[0011] The utility model can simulate the void characteristics of the goaf and the grouting environment through the gravel environment filled in the test box, and obtain test data by adjusting variables such as grouting pressure, grouting material and displacement, which can provide data support for actual projects. Brief Description of the Drawings
[0012] The drawings are used to provide a further understanding of the utility model, and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the utility model, and do not constitute a limitation to the utility model. In the drawings:
[0013] Figure 1 is a schematic diagram of the overall structure of the utility model.
[0014] In the figure: 1, mixing bin; 2, grouting pump; 3, pipeline; 4, test box; 5, steel pipe; 6, gravel; 7, temperature and humidity sensor; 8, butterfly valve; 9, flowmeter; 10, pressure gauge. Detailed Embodiments
[0015] The following will clearly and completely describe the technical solutions in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments; based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the utility model.
[0016] Embodiment 1
[0017] As Figure 1 shown, this embodiment provides a goaf grouting test device, including a mixing bin 1, a grouting pump 2, a pipeline 3 and a test box 4. A steel pipe 5 is penetrated in the test box 4. The steel pipe 5 is a perforated pipe with holes all over its body. The test box 4 is filled with gravel 6. A plurality of groups of temperature and humidity sensors 7 are uniformly buried in the gravel 6. The mixing bin 1 is connected to the grouting pump 2 through the pipeline 3. The grouting pump 2 is connected to one end of the steel pipe 5 through the pipeline 3. The other end of the steel pipe 5 is connected to the mixing bin 1 through the pipeline 3. A butterfly valve 8 is provided at the end of the steel pipe 5 connected to the mixing bin 1. The end of the steel pipe 5 connected to the grouting pump 2 is the injection end, and the end of the steel pipe 5 connected to the mixing bin 1 is the injection end. A flowmeter 9 and a pressure gauge 10 are provided on the pipeline 3 connecting the grouting pump 2 and the steel pipe 5.
[0018] Embodiment 2
[0019] As Figure 1As shown in the figure, this embodiment provides a goaf grouting test device, which includes a mixing bin 1, a grouting pump 2, a pipeline 3 and a test box 4. A steel pipe 5 runs through the test box 4. The steel pipe 5 is a perforated pipe with holes all over its body. The test box 4 is filled with crushed stones 6. A plurality of groups of temperature and humidity sensors 7 are evenly buried in the crushed stones 6. The distance between adjacent two groups of temperature and humidity sensors 7 is 100-300 mm. The mixing bin 1 is connected to the grouting pump 2 through the pipeline 3. The grouting pump 2 is connected to one end of the steel pipe 5 through the pipeline 3. The other end of the steel pipe 5 is connected to the mixing bin 1 through the pipeline 3. A butterfly valve 8 is provided at the end of the steel pipe 5 connected to the mixing bin 1. The end of the steel pipe 5 connected to the grouting pump 2 is the injection end, and the end of the steel pipe 5 connected to the mixing bin 1 is the discharge end. A flow meter 9 and a pressure gauge 10 are provided on the pipeline 3 connecting the grouting pump 2 and the steel pipe 5.
[0020] Embodiment 3
[0021] As Figure 1 As shown in the figure, this embodiment provides a goaf grouting test device, which includes a mixing bin 1, a grouting pump 2, a pipeline 3 and a test box 4. The test box 4 is a steel rectangular box with square end faces, and the length, width and height of the test box 4 are 3m×2m×2m. A steel pipe 5 runs through the test box 4. The steel pipe 5 is a perforated pipe with holes all over its body. The steel pipe 5 is arranged at the center of the test box 4, and both ends of the steel pipe 5 are located at the center positions of the two square faces on both sides of the test box 4. The test box 4 is filled with crushed stones 6. A plurality of groups of temperature and humidity sensors 7 are evenly buried in the crushed stones 6. The distance between adjacent two groups of temperature and humidity sensors 7 is 100-300 mm. The mixing bin 1 is connected to the grouting pump 2 through the pipeline 3. The grouting pump 2 is connected to one end of the steel pipe 5 through the pipeline 3. The other end of the steel pipe 5 is connected to the mixing bin 1 through the pipeline 3. A butterfly valve 8 is provided at the end of the steel pipe 5 connected to the mixing bin 1. The end of the steel pipe 5 connected to the grouting pump 2 is the injection end, and the end of the steel pipe 5 connected to the mixing bin 1 is the discharge end. A flow meter 9 and a pressure gauge 10 are provided on the pipeline 3 connecting the grouting pump 2 and the steel pipe 5.
[0022] During specific use:
[0023] (1) Fill the test box 4 with crushed stones 6. The size, gradation and porosity of the crushed stones 6 are determined according to the experimental design;
[0024] (2) Connect the mixing bin 1, the grouting pump 2 and the test box 4 through the pipeline 3. Pour the grouting materials and water into the mixing bin 1 according to the experimental ratio and start stirring;
[0025] (3) Close the butterfly valve 8 at the discharge end and open the grouting pump 2 to start the grouting work;
[0026] (4) Control the experimental variables by adjusting the pressure and flow rate of the pump;
[0027] (5)Collect the data of the injection end pressure, flow rate, and the temperature and humidity sensors 7 and pressure sensors in the test chamber 4;
[0028] (6)After the experiment, turn off the grouting pump 2, open the butterfly valve 8 at the injection end, and discharge the residual grout in the steel pipe 5.
[0029] The void characteristics of the goaf and the grouting environment can be simulated through the gravel 6 environment filled in the test chamber 4. Under the action of the grouting pump 2, the grouting material in the mixing bin 1 is transported into the steel pipe 5, and the grouting material is injected between the gravel 6 through the holes on the steel pipe 5. In this utility model, experiments are carried out by adjusting variables such as grouting pressure, grouting material, and flow rate. At the same time, the numerical values of the temperature and humidity sensors 7 are collected to obtain test data, providing data support for actual projects. At the same time, in cooperation with the test of this test device, the external water seepage situation can also be monitored outside the test chamber 4.
[0030] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. A goaf grouting test device, comprising a mixing chamber (1), a grouting pump (2), a pipeline (3) and a test box (4), characterized in that: A steel pipe (5) is provided through the test box (4), and the steel pipe (5) is a flower pipe with holes all over the body. The test box (4) is filled with crushed stone (6), and a plurality of groups of temperature and humidity sensors (7) are evenly buried in the crushed stone (6). The mixing chamber (1) is connected to the grouting pump (2) through the pipeline (3), and the grouting pump (2) is connected to one end of the steel pipe (5) through the pipeline (3). The other end of the steel pipe (5) is connected to the mixing chamber (1) through the pipeline (3). A butterfly valve (8) is provided on the end of the steel pipe (5) connected to the mixing chamber (1). The end of the steel pipe (5) connected to the grouting pump (2) is the injection end, and the end of the steel pipe (5) connected to the mixing chamber (1) is the discharge end. A flow meter (9) and a pressure gauge (10) are provided on the pipeline (3) connecting the grouting pump (2) and the steel pipe (5).
2. A goaf grouting test device according to claim 1, characterized in that: The distance between two adjacent groups of the temperature and humidity sensors (7) is 100-300 mm.
3. A goaf grouting test device according to claim 2, characterized in that: The test box (4) is a steel rectangular box with two end faces being square.
4. A goaf grouting test device according to claim 3, characterized in that: The length, width and height of the test box (4) are 3m×2m×2m.
5. A goaf grouting test device according to claim 4, characterized in that: The steel pipe (5) is arranged at the center of the test box (4), and the two ends of the steel pipe (5) are respectively located at the center positions of the two side square surfaces of the test box (4).