High concentration fly ash slurry grouting diffusion test device

Abstract

This utility model discloses a high-concentration fly ash slurry grouting diffusion test device, including a mixing tank, a mixing mechanism, a grouting pipe, a delivery pump, a test base plate, a viscosity gauge, and a camera. The mixing tank contains fly ash slurry material, and the mixing mechanism is used to mix the material in the mixing tank. Two viscosity gauges are provided, intersecting in a cross shape and attached to the test base plate. One end of the grouting pipe extends into the mixing tank, and the other end is located above the test base plate, directly opposite the intersection of the two viscosity gauges. The delivery pump is mounted on the grouting pipe. The camera is located above the test base plate, directly opposite the intersection of the two viscosity gauges. This utility model can test the diffusion radius of fly ash filling slurry with different water-ash ratios under different grouting times and flow rates, analyze the diffusion law, and provide important guidance for practical engineering.

Description

Technical Field

[0001] This utility model relates to the field of high-concentration fly ash slurry injection test technology, and in particular to a high-concentration fly ash slurry injection diffusion test device. Background Technology

[0002] Coal is my country's primary energy source and a crucial guarantee for the country's secure and stable power supply and economic and social development. However, the coal-fired power generation process generates a large amount of fly ash solid waste, which, if left untreated for a long time, will seriously pollute the soil, water sources, and atmosphere. Yet, fly ash can also be used as a raw material in the field of mine grouting and backfilling. In actual grouting operations, the grouting stage is divided into two phases: unpressurized and pressurized. For localized grouting, the diffusion radius of the grout in the unpressurized stage is the main focus of this experimental study. Studying this stage not only yields the time required to reach a specified thickness and begin forming support, but also provides data on the grout diffusion radius, which has important guiding significance for practical engineering applications.

[0003] Grouting is widely used in the management of various adverse geological hazards due to its simple operation and minimal disturbance to the soil and rock mass. Related fields include water conservancy and hydropower projects, transportation engineering, and underground mining engineering. The development of grouting methods relies heavily on numerous model tests, and domestic and international scholars have developed a series of experimental devices, which have promoted the development of grouting theory and provided guidance for engineering practice. However, the diffusion of grout in the injected medium is often concealed, and current technology makes it difficult to track and observe the diffusion state. Furthermore, the diffusion of grout is influenced by multiple factors, including the grouting process, the characteristics of the injected soil and rock, and the properties of the grout, causing grouting theory to lag behind engineering applications and hindering the scientific guidance of grouting projects. Therefore, there is an urgent need to explore how to further track and observe the diffusion state of grout, and thus, a grouting diffusion test device for high-concentration fly ash grout is urgently needed. Utility Model Content

[0004] The purpose of this invention is to provide a high-concentration fly ash slurry diffusion test device, which can test the diffusion radius of fly ash filling slurry with different water-ash ratios, different grouting times and flow rates, analyze the diffusion law, and provide important guidance for engineering practice.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A high-concentration fly ash slurry grouting diffusion test device includes a mixing tank, a mixing mechanism, a grouting pipe, a delivery pump, a test base plate, a sticky ruler, and a camera. The mixing tank contains fly ash slurry material, and the mixing mechanism is used to mix the material in the mixing tank. Two sticky rulers are provided and are affixed to the test base plate in a cross shape. One end of the grouting pipe extends into the mixing tank, and the other end of the grouting pipe is located above the test base plate and directly opposite the intersection of the two sticky rulers. The delivery pump is installed on the grouting pipe, and the camera is located above the test base plate and directly opposite the intersection of the two sticky rulers.

[0007] Preferably, the system further includes a support and positioning mechanism, which comprises a vertical support and a horizontal hollow tube. Two vertical supports are provided, and the two vertical supports are adjacent to opposite sides of the test base plate. The horizontal hollow tube is mounted on the upper end of the two vertical supports and is located directly above the test base plate. The side wall of the horizontal hollow tube has a through hole connecting the inside and outside, and the through hole is directly opposite the intersection of the two adhesive rulers. The grouting pipe is a soft grouting pipe, and the end of the grouting pipe away from the mixing tank enters the horizontal hollow tube and exits through the through hole.

[0008] Preferably, the support and positioning mechanism further includes a vertical extension tube, which is connected to the through hole of the horizontal hollow tube. The lower end of the vertical extension tube is directly opposite the intersection of the two adhesive rulers. The end of the grouting pipe enters into the vertical extension tube and exits from the lower end of the vertical extension tube.

[0009] Preferably, it also includes a fixing member, through which the vertical extension pipe and the grouting pipe are fixed.

[0010] Preferably, the horizontal hollow tube is made of stainless steel.

[0011] Preferably, the length of the vertical support is adjustable along the height direction.

[0012] Preferably, the test base plate is a rubber test base plate.

[0013] Preferably, the test base plate is square, and side plates are provided on all four sides of the test base plate, forming a test space between the test base plate and the four side plates.

[0014] Preferably, the system further includes a connecting bracket comprising a column and a horizontal bar. The column is located on one side adjacent to the test base plate. One end of the horizontal bar is fixed to the upper end of the column, and the other end of the horizontal bar extends above the test base plate and is located directly above the intersection of the two adhesive rulers. The camera is fixed to the end of the horizontal bar away from the column.

[0015] Preferably, the delivery pump is a constant flow peristaltic pump.

[0016] Compared with the prior art, the beneficial effects of this utility model embodiment of a high-concentration fly ash slurry grouting diffusion test device are as follows:

[0017] In this invention, the stirring mechanism agitates the materials in the mixing tank to obtain a uniformly mixed fly ash slurry. Then, under the operation of the delivery pump, the fly ash slurry is transported to the test base plate through the grouting pipe. A camera records the flow direction and dominant channel changes of the fly ash slurry during its flow. Simultaneously, the readings of the viscosity gauge are used to read the slurry diffusion radius in four directions. The average value is then taken to obtain the slurry diffusion radius, ultimately revealing the growth pattern of the slurry diffusion radius. Furthermore, the high-concentration fly ash slurry grouting diffusion test device can test the diffusion radius of fly ash filling slurries with different water-ash ratios under different grouting times and flow rates, analyzing the diffusion pattern. This can be used to address the filling effect of grouting with different high-concentration fly ash slurries. Therefore, this invention not only provides the time required for the fly ash slurry to reach a specified thickness and begin forming support, but also obtains slurry diffusion radius data, thus providing important guidance for practical engineering projects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0019] In the diagram, 1. Mixing tank; 2. Mixing mechanism; 3. Grouting pipe; 4. Delivery pump; 5. Test base plate; 6. Adhesive ruler; 7. Camera; 8. Vertical support; 9. Horizontal hollow pipe; 10. Vertical extension pipe; 11. Side plate; 12. Connecting support. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] In the description of this utility model, it should be understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, parts, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts, components, and / or groups thereof. It should be understood that when we say a part is "connected" to another part, it can be directly connected to the other part, or there may be intermediate parts. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0022] like Figure 1 As shown, this utility model relates to a high-concentration fly ash slurry grouting diffusion test device, including a mixing tank 1, a mixing mechanism 2, a grouting pipe 3, a delivery pump 4, a test base plate 5, a sticky ruler 6, and a camera 7. The mixing tank 1 is used to store fly ash slurry material, and the mixing tank 1 is selected with a volume of 25L. The mixing mechanism 2 is used to mix the material in the mixing tank 1. The mixing mechanism 2 is a small mixer. There are two sticky rulers 6, which are cross-shaped and attached to the test base plate 5. The test base plate 5 is 3.5m x 3.5m. One end of the grouting pipe 3 extends into the mixing tank 1, and the other end of the grouting pipe 3 is located above the test base plate 5 and directly opposite the intersection of the two sticky rulers 6. The delivery pump 4 is installed on the grouting pipe 3. The camera 7 is located above the test base plate 5 and directly opposite the intersection of the two sticky rulers 6.

[0023] In this invention, the stirring mechanism 2 stirs the materials in the stirring tank 1 to obtain a uniformly mixed fly ash slurry. Then, under the operation of the conveying pump 4, the fly ash slurry is transported to the test base plate 5 through the grouting pipe 3. The camera 7 records the flow direction and dominant channel changes of the fly ash slurry during its flow process. Simultaneously, the readings of the viscosity gauge 6 are used to read the slurry diffusion radius in four directions. The average value is then taken to obtain the slurry diffusion radius, ultimately revealing the growth pattern of the slurry diffusion radius. Furthermore, the high-concentration fly ash slurry grouting diffusion test device can test the diffusion radius of fly ash filling slurries with different water-cement ratios under different grouting times and flow rates, analyzing the diffusion pattern. This can be used to address the filling effect of grouting different high-concentration fly ash slurries. Therefore, this invention not only provides the time required for the fly ash slurry to reach a specified thickness and begin to form a support, but also provides data on the slurry diffusion radius, thus offering important guidance for practical engineering projects.

[0024] In this embodiment, the high-concentration fly ash slurry grouting diffusion test device further includes a support and positioning mechanism. The support and positioning mechanism includes a vertical support 8 and a horizontal hollow tube 9. There are two vertical supports 8, and the two vertical supports 8 are adjacent to the opposite sides of the test base plate 5. The horizontal hollow tube 9 is mounted on the upper end of the two vertical supports 8 and is located directly above the test base plate 5. The side wall of the horizontal hollow tube 9 has a through hole connecting the inside and outside, and the through hole is directly opposite the intersection of the two adhesive rulers 6. The grouting pipe 3 is a soft grouting pipe 3. The end of the grouting pipe 3 away from the mixing tank 1 enters the horizontal hollow tube 9 and exits through the through hole.

[0025] By setting the horizontal hollow tube 9, the soft grouting pipe 3 can be led to the through hole through the horizontal hollow tube 9, and the end of the grouting pipe 3 is oriented towards the intersection of the two adhesive rulers 6. Therefore, the horizontal hollow tube 9 can guide and constrain the grouting pipe 3, so that the grouting pipe 3 can be easily arranged and its position can be ensured to be stable.

[0026] Preferably, the support positioning mechanism further includes a vertical extension tube 10, which is connected to the through hole of the horizontal hollow tube 9. The lower end of the vertical extension tube 10 is directly opposite the intersection of the two adhesive rulers 6. The end of the grouting pipe 3 enters into the vertical extension tube 10 and exits from the lower end of the vertical extension tube 10.

[0027] By setting the vertical extension pipe 10, the end of the grouting pipe 3 is guided downward to better face the intersection of the two adhesive rulers 6, so as to ensure the smooth progress of the test. At the same time, the end of the grouting pipe 3 away from the mixing tank 1 is located 40cm above the test base plate 5.

[0028] Furthermore, the high-concentration fly ash slurry grouting diffusion test device also includes a fixing component, and the vertical extension pipe 10 and the grouting pipe 3 are fixed together by the fixing component.

[0029] That is, by fixing the grouting pipe 3 with the fixing component, the grouting pipe 3 is prevented from shaking when the conveying pump 4 is conveying fly ash slurry, which would affect the test results.

[0030] Specifically, the fixing member can be a rope to tie and fix the end of the grouting pipe 3 to the vertical extension pipe 10. The fixing member can also be a buckle, which is set inside the vertical extension pipe 10 and locks the grouting pipe 3.

[0031] In this embodiment, the horizontal hollow tube 9 is made of stainless steel to have sufficient structural strength.

[0032] In this embodiment, the length of the vertical support 8 along the height direction is adjustable.

[0033] It should be noted that the vertical support 8 is a conventional adjustable vertical support 8 available on the market. The vertical support 8 can be multiple vertical tubes connected together in sequence, so that the length of the vertical support 8 can be adjusted when the multiple vertical tubes slide relative to each other. The vertical support 8 can also be multiple vertical tubes that can be spliced ​​together end to end, so that the length of the vertical support 8 can be adjusted according to the number of vertical tubes spliced ​​together.

[0034] In this embodiment, the test base plate 5 is a rubber test base plate 5, the test base plate 5 is square, and side plates 11 are provided on all four sides of the test base plate 5. The test base plate 5 and the four side plates 11 enclose a test space.

[0035] Therefore, by providing the side plate 11 on the outer periphery of the test base plate 5, it is possible to prevent the slurry from seeping out.

[0036] In this embodiment, the high-concentration fly ash slurry grouting diffusion test device further includes a connecting bracket 12, which includes a column and a horizontal rod. The column is located on the side adjacent to the test base plate 5. One end of the horizontal rod is fixed to the upper end of the column, and the other end of the horizontal rod extends above the test base plate 5 and is located directly above the intersection of the two adhesive rulers 6. The camera 7 is fixed to the end of the horizontal rod away from the column.

[0037] Therefore, by setting the connecting bracket 12, the camera 7 can be positioned directly above the intersection of the two adhesive rulers 6.

[0038] In this embodiment, the delivery pump 4 is a constant flow peristaltic pump, which can stably deliver the slurry, facilitate the calculation of the grouting volume, and ensure the accuracy and stability of the test. Specifically, the grouting flow rate is 100 mL / min during the test.

[0039] The test procedure of the high-concentration fly ash slurry grouting diffusion test device:

[0040] Based on the actual engineering situation, the water-cement ratio of fly ash filling slurry was 0.8:1, 0.7:1, 0.6:1, 0.5:1, and 0.4:1 for slurry flow simulation tests.

[0041] Each time, a certain amount of slurry was prepared in a 25L mixing tank 1. A small experimental mixer was used to continuously stir the slurry in tank 1 at a constant speed of 300r / s to simulate the stirring of the slurry in a mixing tank, preventing slurry sedimentation and water-cement separation from affecting the injectability of the slurry. Records were kept for each batch of slurry prepared, which were used to calculate the final grouting volume at the end of the experiment and for comparison.

[0042] Before grouting, turn on the delivery pump 4 and insert the inlet of the grouting pipe 3 into the mixing tank 1. Grouting can only begin after the residual liquid in the grouting pipe 3 has been completely drained. The grouting flow rate is adjusted to 100 mL / min. The grouting time is recorded after grout begins to flow from the outlet of the grouting pipe 3.

[0043] During the grouting process, diffusion distance data is recorded every minute to 30 minutes in the early stage.

[0044] The thickness of the central part of the ash body was recorded once every 5 hours during the experiment. After the experiment, the final ash body morphology was observed, and the ash body consolidation state of fly ash slurry with different water-ash ratios was compared.

[0045] By observing the changes in the slurry flow direction and dominant channels during the slurry flow process, and comparing the ash body consolidation state of fly ash slurries with different water-ash ratios, the growth law of the slurry diffusion radius was obtained.

[0046] In summary, this invention not only provides the time required for support to begin forming once a specified thickness is reached, but also provides data on the slurry diffusion radius, which has important guiding significance for practical engineering applications.

[0047] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A high-concentration fly ash slurry grouting diffusion test device, characterized in that, The apparatus includes a mixing tank, a mixing mechanism, a grouting pipe, a delivery pump, a test base plate, a sticky ruler, and a camera. The mixing tank contains fly ash slurry. The mixing mechanism is used to mix the material in the mixing tank. Two sticky rulers are provided and are attached to the test base plate in a cross shape. One end of the grouting pipe extends into the mixing tank, and the other end of the grouting pipe is located above the test base plate and directly opposite the intersection of the two sticky rulers. The delivery pump is installed on the grouting pipe. The camera is located above the test base plate and directly opposite the intersection of the two sticky rulers.

2. The high-concentration fly ash slurry grouting diffusion test device according to claim 1, characterized in that, It also includes a support and positioning mechanism, which includes a vertical bracket and a horizontal hollow tube. There are two vertical brackets, which are located adjacent to opposite sides of the test base plate. The horizontal hollow tube is mounted on the upper end of the two vertical brackets and is located directly above the test base plate. The side wall of the horizontal hollow tube has a through hole connecting the inside and outside, and the through hole is directly opposite the intersection of the two adhesive rulers. The grouting pipe is a soft grouting pipe, and the end of the grouting pipe away from the mixing tank enters the horizontal hollow tube and exits through the through hole.

3. The high-concentration fly ash slurry grouting diffusion test device according to claim 2, characterized in that, The support and positioning mechanism also includes a vertical extension tube, which is connected to the through hole of the horizontal hollow tube. The lower end of the vertical extension tube is directly opposite the intersection of the two adhesive rulers. The end of the grouting pipe enters the vertical extension tube and exits from the lower end of the vertical extension tube.

4. The high-concentration fly ash slurry grouting diffusion test device according to claim 3, characterized in that, It also includes a fixing component, which fixes the vertical extension pipe to the grouting pipe.

5. The high-concentration fly ash slurry grouting diffusion test device according to claim 2, characterized in that, The horizontal hollow tube is made of stainless steel.

6. The high-concentration fly ash slurry grouting diffusion test device according to claim 2, characterized in that, The length of the vertical support is adjustable along the height direction.

7. The high-concentration fly ash slurry grouting diffusion test device according to claim 1, characterized in that, The test base plate is a rubber test base plate.

8. The high-concentration fly ash slurry grouting diffusion test device according to claim 7, characterized in that, The test base plate is square, and side plates are provided on all four sides of the test base plate. The test base plate and the four side plates enclose a test space.

9. The high-concentration fly ash slurry grouting diffusion test device according to claim 1, characterized in that, It also includes a connecting bracket, which includes a column and a horizontal bar. The column is located on one side adjacent to the test base plate. One end of the horizontal bar is fixed to the upper end of the column, and the other end of the horizontal bar extends above the test base plate and is located directly above the intersection of the two adhesive rulers. The camera is fixed to the end of the horizontal bar away from the column.

10. The high-concentration fly ash slurry grouting diffusion test device according to claim 1, characterized in that, The delivery pump is a constant flow peristaltic pump.

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