Paste rapid solidification filling process and system

Abstract

The present application provides a paste quick-setting filling process and system, which includes a ground slurry preparation system and an underground accelerator injection system, the ground slurry preparation system includes a material adding device and a liquid material adding device, the liquid material adding device is used to add a first accelerator and water, the underground accelerator injection system includes an underground pipeline, a second accelerator adding device, a material distribution pipeline and a filling area connected in sequence, before the first accelerator and the second accelerator are mixed, the quick-setting time of the paste is longer than 1h, and after the first accelerator and the second accelerator are mixed, the quick-setting time of the paste is shortened to 5-30min. The present application realizes flexible control over paste quick-setting time by adding the accelerator from the ground and the underground end in batches, which can significantly save the working space in the underground and the amount of the underground accelerator used, thereby saving costs, and the control over segmented quick-setting can significantly reduce the total amount of the accelerator used, which is therefore safe, economical and easy to put into practice.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application with an application number of 202211504375.2 and an invention title of "Paste Quick-Setting Filling Process and System", which was filed on November 28, 2022, and the entire content of which is incorporated herein by reference.

[0002] This application relates to the technical field of tunnel filling, and particularly to a paste quick-setting filling process and system.

Background Art

[0003] In integrated coal mining paste filling and large cross-section short-wall filling mining, in order to ensure the safe long-distance transportation of paste, the initial slump value of the paste is generally about 250 mm, and the setting time after the paste reaches the filling area is as long as 8 - 12 h. Before filling, it is necessary to isolate and seal the filling area. Due to the good fluidity of the paste, the diffusion radius is more than 60 m. Generally, the filling volume per time is all more than 1000 m3, increasing the intensity and difficulty of filling and isolation. In the filling process, workers need to constantly monitor the integrity of the isolation holders and retaining walls, otherwise slurry leakage accidents may occur, posing safety risks to on-site workers. On the other hand, since the working time of the isolation and filling processes is as long as 20 h, the filling efficiency is reduced, restricting the improvement of the filling production capacity.

[0004] Quick-setting filling has gradually been used in underground tunnel filling. However, conventional quick-setting filling often prepares slurry in the pit and then fills it. On the one hand, it needs to occupy a large space in the pit, and it takes a lot of effort to transport equipment and materials into the pit. On the other hand, the flexibility and safety of operations in the pit are weaker than those on the ground. To achieve the quick setting of a large volume of paste, more quick-setting agents need to be added, increasing the costs of transporting and storing the additives.

[0005] Therefore, in order to ensure that the paste entering the filling area solidifies rapidly within a limited time and maximize safety and production capacity, it is necessary to provide a safe paste rapid-solidification filling process and system.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The object of the present application is to provide a paste rapid-solidification filling process and system. By adding the rapid-solidifying agent in batches from the ground and the underground end, flexible control over the paste rapid-solidification time can be achieved, and the underground working space and the usage amount of the underground rapid-solidifying agent can be significantly saved. Thereby, costs can be saved, and by controlling the segmented rapid-solidification, the total usage amount of the rapid-solidifying agent can be significantly reduced. Therefore, it has high safety and economy and is easy to put into practical use.

Means for Solving the Problems

[0007] To achieve the above object, the present application provides a paste rapid-solidification filling system. The paste rapid-solidification filling system includes a ground slurry preparation system and an underground rapid-solidifying agent injection system. The ground slurry preparation system includes an aggregate addition device and a liquid material addition device, and is used for adding a first rapid-solidifying agent and water. The underground rapid-solidifying agent injection system includes an underground pipeline, a second rapid-solidifying agent addition device, a material distribution pipeline, and a filling area connected in sequence. Before the first rapid-solidifying agent and the second rapid-solidifying agent are mixed, the rapid-solidification time of the paste is longer than 1 h. After the first rapid-solidifying agent and the second rapid-solidifying agent are mixed, the rapid-solidification time of the paste is shortened to 5 - 30 min.

[0008] Furthermore, the liquid material addition device includes a first rapid-solidifying agent storage tank, a first injection pump, a first electromagnetic valve, a first flow meter, and a water metering hopper connected in sequence. The addition amount of the first rapid-solidifying agent is controlled by the first electromagnetic valve and the first flow meter.

[0009] Furthermore, the second quick-setting agent adding device includes a second quick-setting agent storage tank, a second injection pump, a second electromagnetic valve, a second flow meter, and a pipeline-type material mixer that are connected in sequence, and the pipeline-type material mixer is provided at the connection point between the in-pit pipeline and the material distribution pipeline.

[0010] Furthermore, the surface slurry preparation system further includes a material mixing device connected to the aggregate adding device and the liquid material adding device respectively, and the material mixing device is connected to the in-pit pipeline through a filling pump and a surface pipeline.

[0011] Furthermore, the filling system further includes a first quick-setting agent paste conveying capacity monitoring system for monitoring the flow velocity and flow rate of the first quick-setting agent paste in real time so as to determine the addition amount of the second quick-setting agent.

[0012] Furthermore, the filling system further includes a monitoring device for slurry state and filling level provided in the filling area for observing the flow state of the mixed paste.

[0013] A paste quick-setting filling process adopting the paste quick-setting filling system according to any one of the above items, Step S1 of mixing all the aggregates of the paste with the first quick-setting agent and water by a surface slurry preparation system to obtain a first quick-setting agent paste, and then conveying it to an in-pit pipeline; Step S2 of mixing the second quick-setting agent with the first quick-setting agent paste by a second quick-setting agent adding device, and then conveying it to a filling area through the material distribution pipeline, The addition amount of the first quick-setting agent is determined according to the flow time of the first quick-setting agent paste so as to ensure that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 260 mm, and the addition amount of the second quick-setting agent is determined according to the flow velocity and flow rate of the first quick-setting agent paste so as to ensure that the quick-setting time of the mixed paste is longer than the time for flowing from the outlet of the mixing device to the filling area.

[0014] Furthermore, the components of the first quick-setting agent and the second quick-setting agent are different. By adding them in two batches, the addition amount is controlled to achieve control over the final paste quick-setting time.

[0015] The total usage amount of the first quick-setting agent and the second quick-setting agent is 5 - 10 kg / m3. The first quick-setting agent and the second quick-setting agent are aqueous solutions composed of one or more selected from sodium aluminate, potassium hydroxide, sodium carbonate, potassium carbonate, sodium silicate, aluminum hydroxide, triethanolamine, and aluminum sulfate. Preferably, each is one of sodium aluminate and sodium sulfate.

[0016] Furthermore, based on the total length of the flow path of the first quick-setting agent paste and the diameter of the pipeline, the type and addition amount of the first quick-setting agent are designed so that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 260 mm. Based on the total length of the flow path of the mixed paste and the diameter of the pipeline, and the flow velocity and flow rate of the first quick-setting agent paste, the type and addition amount of the second quick-setting agent are determined so that the mixed paste sets within 10 minutes after entering the filling area. On the premise of satisfying the above-described constraints, the total usage amount of the first quick-setting agent and the second quick-setting agent is minimized.

Advantages of the Invention

[0017] The beneficial effects of the present application are as follows.

[0018] The paste quick-setting filling process and system according to the present application realize flexible control over the paste quick-setting time by adding the quick-setting agent in batches from the ground and the underground end, and can significantly save the underground working space and the usage amount of the underground quick-setting agent. Thereby, the cost can be saved, and by controlling the segmented quick-setting, the total usage amount of the quick-setting agent can be significantly reduced. Therefore, it has high safety and economy and is easy to put into practical use.

[0019] Based on the flow paths of the first quick-setting agent and the second quick-setting agent, the types and usage amounts of both can be controlled. As a result, the paste solidifies most quickly after entering the filling area, and the usage amount of the second quick-setting agent in the mine is minimized, thereby reducing the amount of work in the mine.

Brief Description of the Drawings

[0020] Hereinafter, in order to more clearly explain the technical solutions in the present application or the prior art, the drawings necessary for the description of the embodiments or the prior art will be briefly described. Of course, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative labor.

Figure 1

Modes for Carrying Out the Invention

[0021] In order to more clearly explain the object, technical solution and advantages of the present application, the technical solution in the present application will be clearly and completely described below. Of course, the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0022] As shown in FIG. 1, the present application provides a paste quick-setting filling system, which includes a ground slurry preparation system 10 and an in-mine quick-setting agent injection system 20. The ground slurry preparation system 10 includes an aggregate addition device (aggregate metering hopper 11 in FIG. 1) and a liquid material addition device, and is used for adding the first quick-setting agent and water. The in-mine quick-setting agent injection system 20 includes an in-mine pipeline 21, a second quick-setting agent addition device, a material distribution pipeline 27 and a filling area 28 that are connected in sequence.

[0023] When installed in this way, since all the main slurry preparation equipment is provided on the ground , it has high safety and operational convenience, eliminating the need to transport large amounts of materials into the mine, saving labor and the working space in the mine. Mix the aggregate of the paste and some quick-setting agents (the first quick-setting agent) with water to obtain a first quick-setting agent paste with good fluidity. Before being mixed with the second quick-setting agent, the quick-setting time of the paste can meet the requirement of being longer than 1 h. More importantly, it has good fluidity before being mixed, that is, the slump value is greater than 260 mm, thereby ensuring the flow rate of the paste and preventing clogging. In actual operation, based on the length and flow rate of the conveying path of the first quick-setting agent paste, the time required for it to be mixed with the second quick-setting agent paste can be calculated, and further, the type and addition amount of the first quick-setting agent can be designed. Immediately before the first quick-setting agent paste flows to the filling area, that is, at the inlet of the material distribution pipeline 27, by adding a second quick-setting agent adding device, the remaining part of the quick-setting agent is let into the paste conveying pipeline and mixed with the first quick-setting agent paste. In order to improve the mixing uniformity, a pipeline-type material mixer 26 is provided in the pipeline to obtain a mixed paste. The type and addition amount of the second quick-setting agent are determined based on the state during the mixing of the first quick-setting agent paste so that after the first quick-setting agent and the second quick-setting agent are mixed, the quick-setting time of the mixed paste is shortened to 5 - 30 min, preferably 5 - 20 min, more preferably 5 - 15 min, and even more preferably 5 - 10 min.

[0024] In this application, the aggregate may be selected from coal gangue (or aeolian sand), fly ash, and Portland cement. The mass concentration of the paste is between 70% and 82%. The particle size of the gangue aggregate is generally 10 mm or less. In the paste, the mass ratio of coal gangue (or aeolian sand), fly ash, Portland cement, and water is about 6:1:1:2. Based on this, the first quick-setting agent and the second quick-setting agent are added.

[0025] Specifically, the liquid material adding device includes a first quick-setting agent storage tank 12, a first injection pump 13, a first electromagnetic valve 14, a first flow meter 15, and a water metering hopper 16 connected in sequence. The first electromagnetic valve 14 and the first flow meter 15 control the addition amount of the first quick-setting agent. The error of the metering system is 5 kg / m3 or less. Further, the ground slurry preparation system 10 further includes a material mixing device 17 connected to the aggregate adding device and the liquid material adding device respectively. The material mixing device 17 is connected to the underground pipeline 21 through a filling pump 18 and a ground pipeline. The first quick-setting agent is quantitatively added from the first quick-setting agent storage tank 12 to the water metering hopper 16, and the adding method is transportation by a pump pressure pipeline. The signal of the first flow meter 15 is sent to the ground filling centralized monitoring system to facilitate intelligent control of the filling process parameters.

[0026] The second quick-setting agent adding device includes a second quick-setting agent storage tank 22, a second injection pump 23, a second electromagnetic valve 24, a second flow meter 25, and a pipeline type material mixer 26 connected in sequence. The pipeline type material mixer 26 is provided at the connection point between the underground pipeline 21 and the material distribution pipeline 27. The second quick-setting agent is added to the pipeline type material mixer 26 at the end of the paste transportation main pipeline, that is, the inlet of the material distribution pipeline 27. The distance from the material discharge port of the material distribution pipeline 27 is 200 m or less, for example, one value among 100 - 180 m. The purpose is to reduce the flow time of the mixed paste, thereby preventing it from quickly setting and causing blockage. The second electromagnetic valve 24 and the second flow meter 25 are also controlled by a controller, and the metering signal is sent to the ground filling centralized monitoring system to ensure an accurate mixing ratio and a controllable quick-setting time.

[0027] In particular, the filling system further includes a first quick-setting agent paste transportation capacity monitoring system that monitors the flow rate and flow volume of the first quick-setting agent paste in real time by means of hardware monitoring and software calculation so as to determine the addition amount of the second quick-setting agent.

[0028] The filling system further includes a monitoring device for the slurry state and filling level provided in the filling area 28 to observe the flow state of the mixed paste. The monitoring device for the slurry state and filling level mainly consists of a monitoring camera, a filling level gauge, and a controller. It can intuitively monitor the flow state of the mixed paste, timely monitor the filling level of the slurry, and feedback to the ground centralized monitoring system, so as to achieve high filling rate filling.

[0029] This application further provides a paste quick-setting filling process, which adopts any of the above paste quick-setting filling systems and includes the following steps S1 and S2.

[0030] S1: After mixing all the aggregates of the paste with the first quick-setting agent and water by the ground slurry preparation system 10 to obtain the first quick-setting agent paste, it is transported to the underground pipeline 21.

[0031] S2: The second quick-setting agent is transported to the inlet of the material distribution pipeline 27 by the second quick-setting agent adding device, mixed with the first quick-setting agent paste, and then transported to the filling area 28 through the material distribution pipeline 27. The type and addition amount of the first quick-setting agent are determined according to the flow time of the first quick-setting agent paste so as to ensure that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 150 mm. The type and addition amount of the second quick-setting agent are determined according to the flow rate and flow volume of the first quick-setting agent paste so as to ensure that the quick-setting time of the mixed paste is longer than the time from the inlet of the material distribution pipeline 27 to the filling area 28.

[0032] Specifically, based on the total length of the flow path of the first quick-setting agent paste and the diameter of the pipeline, design the type and dosage of the first quick-setting agent so that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 260 mm. The calculation for this process is that the addition of the first quick-setting agent affects the flow velocity of the first quick-setting agent paste and further affects its flow time. Therefore, by controlling its type and usage amount, the state when it is mixed with the second quick-setting agent can be controlled. Subsequently, based on the total length of the flow path of the mixed paste and the diameter of the pipeline, and the flow velocity and flow rate of the first quick-setting agent paste, determine the type and dosage of the second quick-setting agent so that it quick-sets within 10 minutes after the mixed paste enters the filling area 28. On the condition of satisfying the above-mentioned constraints, maximizing the usage amount of the first quick-setting agent and minimizing the usage amount of the second quick-setting agent is the optimal implementation form of quick-setting filling. Installed in this way, the usage amount of the in-pit quick-setting agent can be reduced as much as possible, thereby reducing the amount of materials transported into the pit and saving labor.

[0033] In some embodiments, the first quick-setting agent and the second quick-setting agent are different components in the formulation of the quick-setting agent. By controlling the batch mixing of each component, control over the quick-setting time of the mixed paste is achieved. For example, select the formulation of a two-component quick-setting agent. The first quick-setting agent and the second quick-setting agent are each one of the components. After the two components are mixed, the quick-setting effect is better.

[0034] The quick-setting agent of the present application is an aqueous solution composed of one or more selected from potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate, sodium silicate, aluminum hydroxide, triethanolamine, sodium aluminate, and aluminum sulfate. Preferably, it is one of sodium aluminate and sodium sulfate respectively, and at the same time, triethanolamine is added.

[0035] In one specific embodiment, the total length of the paste pipeline of the first quick-setting agent of the filling system of the present application is 2500 m, the length of the material distribution pipeline 27 is 100 m, the diameter of the pipeline is 200 mm, the conveying capacity is 120 - 150 m3 / h, the first quick-setting agent is a mixed aqueous solution composed of sodium aluminate and triethanolamine, and the second quick-setting agent is an aluminum sulfate aqueous solution. Filling is carried out by adopting the above-described filling process. The usage amount of the first quick-setting agent is 2.2 kg / m3. When the first quick-setting agent paste flows to the material distribution pipeline 27, the slump value is 260 mm. The usage amount of the second quick-setting agent is 5.8 kg / m3. After mixing, the quick-setting time is 12 min, and it can solidify within 10 min after flowing into the filling area 28.

[0036] In addition, when the quick-setting agent is directly added at one time, to reach the quick-setting time described in the present application, the total amount of the quick-setting agent added needs to reach 12 kg / m3. From this, it can be seen that the present application can reduce the in-pit usage amount of the quick-setting agent and also reduce the total usage amount by adding the quick-setting agent batch by batch and by time period, so it can be seen that the practical value is quite high.

[0037] As described above, the present application provides a refined control system for quick-setting filling, mainly for slurry preparation on the ground and supplemented by adding quick-setting agent in the pit, which can save costs, improve work safety, and can also improve the controllability and speed of quick-setting filling. And because there is a buffer time at the beginning in the process of transporting the first quick-setting paste, after being mixed with the second quick-setting agent, it can speed up solidification and save the total usage amount of the quick-setting agent, thereby reducing the influence of the quick-setting agent on the paste strength, especially the 28d compressive strength.

[0038] Finally, it should be noted that the above embodiments are merely for explaining the technical means of the present application and do not limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that they can still modify the technical means described in each of the above embodiments or equivalently replace some technical features. And these modifications or replacements do not deviate from the essence of the corresponding technical means from the spirit and scope of the technical means of each embodiment of the present application.

Explanation of Reference Numerals

[0039] 10: Ground slurry preparation system 11: Aggregate metering hopper 12: First quick-setting agent storage tank 13: First injection pump 14: First solenoid valve 15: First flow meter 16: Water metering hopper 17: Material mixing device 18: Filling pump 20: In-pit quick-setting agent injection system 21: In-pit pipeline 22: Second quick-setting agent storage tank 23: Second injection pump 24: Second solenoid valve 25: Second flow meter 26: Pipeline-type material mixer 27: Material distribution pipeline 28: Filling area

Claims

1. A paste quick-setting filling system, including a ground slurry preparation system and an in-pit quick-setting agent injection system, The ground slurry preparation system includes an aggregate addition device and a liquid material addition device, and is used for adding a first quick-setting agent and water, The in-pit quick-setting agent injection system includes an in-pit pipeline, a second quick-setting agent addition device, a material distribution pipeline, and a filling area connected in sequence, Before the first quick-setting agent and the second quick-setting agent are mixed, the quick-setting time of the paste is longer than 1 h. After the first quick-setting agent and the second quick-setting agent are mixed, the quick-setting time of the paste is shortened to 5 - 30 min. The liquid material addition device includes a first quick-setting agent storage tank, a first injection pump, a first solenoid valve, a first flow meter, and a water metering hopper connected in sequence. The addition amount of the first quick-setting agent is controlled by the first solenoid valve and the first flow meter. The second quick-setting agent addition device includes a second quick-setting agent storage tank, a second injection pump, a second solenoid valve, a second flow meter, and a pipeline-type material mixer connected in sequence. The pipeline-type material mixer is provided at the connection point between the in-pit pipeline and the material distribution pipeline. The filling system further includes a first quick-setting agent paste conveying capacity monitoring system for monitoring the flow velocity and flow rate of the first quick-setting agent paste in real time so as to determine the addition amount of the second quick-setting agent. The filling system further includes a monitoring device for observing the flow state of the mixed paste, including a slurry state and a filling level, provided in the filling area. The monitoring device for the slurry state and the filling level is composed of a monitoring camera, a filling level meter, and a controller. A paste quick-setting filling system, characterized in that.

2. The ground slurry preparation system further includes a material mixing device connected to the aggregate adding device and the liquid material adding device respectively, and the material mixing device is connected to the in-pit pipeline through a filling pump and a ground pipeline. The paste quick-setting filling system according to claim 1 is characterized in that.

3. A paste quick-setting filling process adopting the paste quick-setting filling system according to claim 1 or 2, After mixing all the aggregates of the paste, the first quick-setting agent and water by the ground slurry preparation system to obtain the first quick-setting agent paste, and then transporting it to the in-pit pipeline in step S1; After mixing the second quick-setting agent with the first quick-setting agent paste by the second quick-setting agent adding device, and then transporting it to the filling area through the material distribution pipeline in step S2. The addition amount of the first quick-setting agent is determined by calculating the time required for it to be mixed with the second quick-setting agent paste based on the length and flow rate of the conveying path of the first quick-setting agent so as to ensure that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 260 mm. The addition amount of the second quick-setting agent is determined according to the flow rate and flow volume of the first quick-setting agent paste so as to ensure that the quick-setting time of the mixed paste is longer than the time for flowing from the outlet of the mixing device to the filling area. The paste quick-setting filling process.

4. The components of the first quick-setting agent and the second quick-setting agent are different, and by adding them in two batches, the addition amount is controlled to realize the control of the final paste quick-setting time. The paste quick-setting filling process according to claim 3 is characterized in that.

5. The total usage amount of the first quick-setting agent and the second quick-setting agent is 5-10 kg / m3. The paste quick-setting filling process according to claim 3 is characterized in that.

6. Based on the total length of the flow path of the first quick-setting agent paste and the diameter of the pipeline, design the type and addition amount of the first quick-setting agent so that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 260 mm. Based on the total length of the flow path of the mixed paste and the diameter of the pipeline, and the flow velocity and flow rate of the first quick-setting agent paste, determine the type and addition amount of the second quick-setting agent so that the mixed paste quick-sets within 10 minutes after entering the filling area. The total usage amount of the first quick-setting agent and the second quick-setting agent is minimized on the condition that the slump value before the first quick-setting agent paste and the second quick-setting agent are mixed is greater than 260 mm and the mixed paste quick-sets within 10 minutes after entering the filling area. The paste quick-setting filling process according to claim 4, characterized in that.

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