A double-liquid premixed grouting device

Abstract

The utility model provides a kind of double-liquid premixing grouting device, including double-liquid pump, plunger pump and three-way valve, the first inlet of double-liquid pump is connected with cement slurry storage tank by first pipeline, second inlet is connected with the outlet b of three-way valve by second pipeline, the outlet of double-liquid pump is connected with the grouting orifice to be injected by third pipeline;The inlet of plunger pump is connected with the outlet c of three-way valve by fourth pipeline, the outlet of plunger pump is connected with the grouting orifice to be injected by fifth pipeline;The inlet a of three-way valve is connected with water magic crystal solution preparation system by sixth pipeline.The utility model is parallelly connected by design double-liquid pump and plunger pump, and the flow path of water magic crystal solution is controlled via three-way valve, when large-flow grouting, water magic crystal solution and cement slurry are mixed and transported using double-liquid pump;When small-flow grouting, then switch is by plunger pump to transport water magic crystal solution to orifice and cement slurry mixing, solve the pipeline blockage problem caused by material rapid gelation in small-flow delivery of slurry.

Description

Technical Field

[0001] This utility model relates to the field of grouting engineering technology, and in particular to a two-liquid premixed grouting device. Background Technology

[0002] In tunnel wall grouting projects, water-based crystals are often used as functional admixtures to enhance the shrinkage resistance and seepage prevention performance of the grout. Water-based crystals have rapid water absorption and release properties, forming an internal curing water source within the cement matrix. However, their water absorption capacity decreases significantly in non-pure water matrices, therefore they cannot be directly added to cement. They must be pre-dissolved in water to prepare a crystal solution of a specified concentration before being mixed with the cement slurry. Traditional processes typically involve pre-mixing the crystal solution with the cement slurry in storage tanks or pipelines. However, because water-based crystals have an extremely short setting time, losing their fluidity in just a few seconds, conventional mixing methods easily lead to premature solidification of the slurry in equipment or pipelines, resulting in a high risk of blockage.

[0003] In real-world scenarios such as grouting behind subway tunnel segments, the grouting orifices are scattered, the grouting time per orifice varies, and long-term continuous grouting is often required at flow rates of 5–15 L / min. While traditional two-component grouting systems can achieve two-component distribution, their bulky size necessitates fixed installation on a work platform, resulting in a significant distance between the mixing outlet and the actual grouting orifice on the tunnel wall. After flowing from the mixing point, the grout must travel through a long pipeline to reach the orifice. During this process, the water-based crystal material gels rapidly and is prone to solidification in the pipeline at low flow rates, leading to blockages.

[0004] Existing grouting equipment is not well-suited for low-flow, long-duration grouting tasks. Conventional dual-liquid pump systems, due to their structural limitations, cannot have a mixing point close to the borehole opening. This results in slow grout flow and prolonged residence time over long distances, which cannot match the rapid gelling characteristics of water-based grouting materials. Consequently, pipe blockages occur frequently, construction is interrupted, and the reliable application of this material in precision tunnel grouting is severely restricted. Utility Model Content

[0005] This invention proposes a dual-liquid premixed grouting device, which solves the problem that existing grouting equipment is not adaptable enough to low-flow, long-duration grouting tasks.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a dual-liquid premixed grouting device, including a dual-liquid pump, a plunger pump, and a three-way valve. The first inlet of the dual-liquid pump is connected to a cement slurry storage tank through a first pipe, and the second inlet is connected to the outlet b of the three-way valve through a second pipe. The outlet of the dual-liquid pump is connected to the grouting orifice through a third pipe. The inlet of the plunger pump is connected to the outlet c of the three-way valve through a fourth pipe, and the outlet of the plunger pump is connected to the grouting orifice through a fifth pipe. The inlet a of the three-way valve is connected to a water crystal solution preparation system through a sixth pipe.

[0007] Specifically, the sixth pipeline is equipped with a first electric valve and a flow meter.

[0008] Specifically, the water magic crystal solution preparation system includes a first storage tank for storing water magic crystal solution of a preset concentration and a second storage tank for storing water magic crystal stock solution. The first storage tank is equipped with a stirring mechanism. The outlet of the second storage tank is connected to the first inlet of the first storage tank through a seventh pipe. The seventh pipe is equipped with a self-priming pump. The second inlet of the first storage tank is connected to a water supply pipe.

[0009] Furthermore, the first storage tank is equipped with a level gauge, and the water supply pipe is equipped with a second electric valve.

[0010] Furthermore, the self-priming pump is a self-priming metering pump.

[0011] Specifically, the plunger pump is a plunger-type metering pump.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) This utility model achieves flexible switching and efficient operation of the grouting system under different working conditions by designing a dual-liquid pump and a plunger pump in parallel, and controlling the flow path of the water magic crystal solution through a three-way valve. During high-flow grouting, the dual-liquid pump is used to complete the mixing and transportation of the water magic crystal solution and cement slurry; during low-flow grouting, the plunger pump is used to transport the water magic crystal solution to the orifice to mix with the cement slurry. This structure effectively solves the problem of pipe blockage caused by rapid gelation of materials during low-flow transportation of slurry, and significantly improves the adaptability and reliability of the system in low-flow, long-duration grouting tasks; (2) This utility model integrates components such as flow meter, electric valve, level gauge, self-priming metering pump, and plunger metering pump to construct a complete metering and control system. This system can realize the automatic configuration and maintenance of water magic crystal solution concentration, accurate metering and proportion control of the flow rate of each component during grouting, and ensure metering accuracy under low flow conditions. At the same time, it can effectively diagnose abnormalities such as air intake or pipe blockage by comparing flow monitoring data, thus comprehensively improving the accuracy, stability and controllability of the grouting process. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the pipeline structure of a dual-liquid premixed grouting device according to the present invention; In the diagram: 1. Dual-liquid pump; 2. Plunger pump; 3. Three-way valve; 4. First pipeline; 5. Second pipeline; 6. Third pipeline; 7. Fourth pipeline; 8. Fifth pipeline; 9. Sixth pipeline; 10. First electric valve; 11. Flow meter; 12. First storage tank; 13. Second storage tank; 14. Stirring mechanism; 15. Seventh pipeline; 16. Self-priming pump; 17. Water supply pipe; 18. Second electric valve. Detailed Implementation

[0015] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Reference Figure 1 This utility model provides a dual-liquid premixed grouting device, including a dual-liquid pump 1, a plunger pump 2, and a three-way valve 3. The first inlet of the dual-liquid pump 1 is connected to a cement slurry storage tank through a first pipe 4, and the second inlet is connected to the outlet b of the three-way valve 3 through a second pipe 5. The outlet of the dual-liquid pump 1 is connected to the grouting orifice through a third pipe 6. The inlet of the plunger pump 2 is connected to the outlet c of the three-way valve 3 through a fourth pipe 7, and the outlet of the plunger pump 2 is connected to the grouting orifice through a fifth pipe 8. The inlet a of the three-way valve 3 is connected to a water crystal solution preparation system through a sixth pipe 9.

[0017] This invention achieves flexible switching and efficient operation of the grouting system under different working conditions by designing a dual-liquid pump 1 and a plunger pump 2 connected in parallel, and controlling the flow path of the water-based grout solution via a three-way valve 3. During high-flow grouting, the dual-liquid pump 1 is used to mix and transport the water-based grout solution with the cement slurry; during low-flow grouting, the plunger pump 2 transports the water-based grout solution to the orifice for mixing with the cement slurry. This structure effectively solves the problem of pipe blockage caused by rapid material gelation during low-flow grout transport, significantly improving the system's adaptability and reliability in low-flow, long-duration grouting tasks.

[0018] Specifically, such as Figure 1 As shown, the sixth pipe 9 is equipped with a first electric valve 10 and a flow meter 11. By installing the first electric valve 10 and the flow meter 11 on the sixth pipe 9, accurate measurement of the flow rate of the water crystal solution is achieved. This design not only allows for real-time monitoring of the amount of crystal solution added, but also, in conjunction with the setting ratio of the dual-liquid pump 1, accurately calculates the total volume of the mixed slurry, providing a guarantee for the quantitative management and quality control of the grouting process.

[0019] Specifically, such as Figure 1 As shown, the water crystal solution preparation system includes a first storage tank 12 for storing a water crystal solution of a preset concentration and a second storage tank 13 for storing the water crystal stock solution. A stirring mechanism 14 is installed on the first storage tank 12. The outlet of the second storage tank 13 is connected to the first inlet of the first storage tank 12 via a seventh pipe 15, on which a self-priming pump 16 is installed. The second inlet of the first storage tank 12 is connected to a water supply pipe 17. By constructing a water crystal solution preparation system consisting of the first storage tank 12 and the second storage tank 13, and equipping it with the stirring mechanism 14, continuous preparation of the water crystal solution from stock solution storage and concentration adjustment to uniform mixing is achieved. This integrated system ensures the stability and timely supply of the solution concentration required for grouting, guaranteeing the performance of the grouting material from the source.

[0020] Furthermore, such as Figure 1 As shown, the first storage tank 12 is equipped with a flap level gauge (not shown in the figure), and the water supply pipe 17 is equipped with a second electric valve 18. By installing a level gauge in the first storage tank 12 and a second electric valve 18 on the water supply pipe 17, a closed-loop concentration control system is constructed. Since the initial concentration of the water crystal concentrate is known, the system can automatically control the opening and closing of the second electric valve 18 to precisely adjust the water addition amount based on the real-time liquid level information monitored by the level gauge and the preset target concentration, thereby achieving automatic and precise configuration of the set concentration solution.

[0021] Furthermore, the self-priming pump 16 is a self-priming metering pump. By using a self-priming metering pump as the raw material delivery unit, not only is a stable delivery of the water crystal raw material from the second storage tank 13 to the first storage tank 12 achieved, but the volume of the pumped raw material can also be accurately measured. This metering data provides a key basis for the system to calculate and control the replenishment amount, thereby more accurately maintaining the stability of the solution concentration in the first storage tank 12.

[0022] Specifically, the plunger pump 2 is a plunger-type metering pump, which provides higher metering accuracy under low flow conditions. The pump's precise flow data can be cross-referenced with the reading of the flow meter 11 on the main pipeline, helping the system to promptly detect and assess abnormalities such as air intake or pipeline blockage. Simultaneously, its high-precision metering characteristics further improve the accuracy of grouting ratios during low-flow grouting.

[0023] The working process of the grouting device in this embodiment is as follows: When the grouting flow demand is large, the control system adjusts the three-way valve 3, allowing the water crystal solution to flow through outlet b to the second inlet of the dual-liquid pump 1. Simultaneously, cement slurry is pumped from the cement slurry storage tank into the first inlet of the dual-liquid pump 1. After the two slurries are mixed in a set ratio inside the dual-liquid pump 1, they are transported to the grouting orifice through the third pipe 6 for injection.

[0024] When the grouting flow rate is low and the grouting time is long, the system switches to the plunger pump 2 grouting mode to avoid the risk of pipe blockage. At this time, the three-way valve 3 switches the passage, allowing the water-based grout solution to flow to the plunger pump 2 through outlet c. The plunger pump 2 pumps the water-based grout solution directly to the grouting orifice through the fifth pipe 8; at the same time, the dual-liquid pump 1 only delivers cement slurry (with no grout solution input at its second inlet) to the same grouting orifice. The two slurries mix instantaneously at the orifice, avoiding the mixed slurry being delivered in the pipe at a low flow rate, fundamentally solving the blockage problem under low flow conditions.

[0025] The system monitors the solution volume in real time through the level gauge in the first storage tank 12, and controls the start and stop of the self-priming metering pump and the flow rate of the second electric valve 18 based on the known concentration of the water crystal stock solution and the preset target concentration, so as to automatically complete the replenishment of the stock solution and the addition of clean water, thereby achieving precise, automatic configuration and continuous supply of the set concentration solution.

[0026] Throughout the grouting process, flow meter 11 continuously monitors the total flow rate of the water crystal solution. Especially in low-flow mode, the high-precision flow data from the plunger metering pump can be compared with the readings of flow meter 11. If the deviation between the two exceeds the preset range, the system can promptly issue an early warning of air intake or pipeline blockage, reminding the operator to intervene.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A two-liquid premixed grouting device, characterized in that, The system includes a dual-liquid pump (1), a plunger pump (2), and a three-way valve (3). The first inlet of the dual-liquid pump (1) is connected to the cement slurry storage tank through a first pipe (4), and the second inlet is connected to the outlet b of the three-way valve (3) through a second pipe (5). The outlet of the dual-liquid pump (1) is connected to the grouting hole through a third pipe (6). The inlet of the plunger pump (2) is connected to the outlet c of the three-way valve (3) through a fourth pipe (7), and the outlet of the plunger pump (2) is connected to the grouting hole through a fifth pipe (8). The inlet a of the three-way valve (3) is connected to the water crystal solution preparation system through a sixth pipe (9).

2. The dual-liquid premixed grouting device as described in claim 1, characterized in that, The sixth pipe (9) is equipped with a first electric valve (10) and a flow meter (11).

3. The dual-liquid premixed grouting device as described in claim 1, characterized in that, The water crystal solution preparation system includes a first storage tank (12) for storing water crystal solution of a preset concentration and a second storage tank (13) for storing water crystal stock solution. The first storage tank (12) is equipped with a stirring mechanism (14). The outlet of the second storage tank (13) is connected to the first inlet of the first storage tank (12) through a seventh pipe (15). The seventh pipe (15) is equipped with a self-priming pump (16). The second inlet of the first storage tank (12) is connected to a water supply pipe (17).

4. The dual-liquid premixed grouting device as described in claim 3, characterized in that, The first storage tank (12) is equipped with a level gauge, and the water supply pipe (17) is equipped with a second electric valve (18).

5. A two-liquid premixed grouting device as described in claim 4, characterized in that, The self-priming pump (16) is a self-priming metering pump.

6. The dual-liquid premixed grouting device as described in claim 1, characterized in that, The plunger pump (2) is a plunger-type metering pump.

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