Tunnel rock mass grouting device for pumped storage power station

Abstract

The utility model relates to the technical field of grouting devices, in particular to a pumped storage power station tunnel rock mass grouting device which comprises a mixing drum, a drum cover, a double-shaft mixing mechanism, a feeding hopper, a grouting propelling mechanism, a flow guide mechanism and an anti-segregation mechanism. A double-shaft stirring mechanism is arranged in the stirring bin, a feeding hopper is arranged at the front end of the surface of the barrel cover, a feeding groove is formed in the feeding hopper, a propelling mechanism is arranged below the stirring barrel and comprises a propelling pipe, and a flow guide mechanism is arranged at the end, away from the stirring barrel, of the propelling pipe. The diversion mechanism comprises a diversion pipe; an anti-segregation mechanism is arranged at one end, far away from the propelling mechanism, of the diversion mechanism; by means of the staggered stirring design of the double-shaft stirring mechanism, grouting raw materials are mixed more sufficiently and evenly, the quality of grout is effectively improved, rock mass cracks can be better filled with the even grout, and the cementing quality and the anti-seepage performance of rock mass are improved.

Description

Technical Field

[0001] This utility model relates to the field of grouting device technology, and in particular to a rock mass grouting device for pumped storage power station tunnels. Background Technology

[0002] In the construction of pumped storage power stations, tunnel engineering is a crucial component, and its stability is directly related to the safe operation of the power station. After the tunnel is excavated, the surrounding rock often has cracks or loose structures, which need to be reinforced by grouting technology to improve the integrity and impermeability of the rock mass.

[0003] Existing grouting devices typically employ single-shaft mixing, which can easily lead to insufficient mixing and poor uniformity of raw materials, making it difficult to form high-quality grout. Furthermore, due to the inherent characteristics of the grout, segregation is highly likely to occur during the grouting process, affecting the grouting effect and the quality of rock mass reinforcement.

[0004] Therefore, in view of the shortcomings of the existing grouting devices, which are prone to insufficient mixing of raw materials, poor uniformity, and easy segregation, a grouting device for the rock mass of pumped storage power station tunnels can be designed. It usually adopts an interlaced biaxial mixing structure to improve the mixing effect of grout, and is combined with a flow guiding structure and an anti-segregation structure to solve the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of existing grouting devices, which are prone to insufficient mixing of raw materials, poor uniformity, and easy segregation, this utility model provides a rock mass grouting device for pumped storage power station tunnels.

[0006] The technical solution is as follows: a grouting device for the rock mass of a pumped storage power station tunnel, comprising a mixing drum, a drum cover, a twin-shaft mixing mechanism, a hopper, a grouting propulsion mechanism, a flow guiding mechanism, and an anti-segregation mechanism; the mixing drum has a mixing chamber inside, a drum cover is provided above the mixing drum, a twin-shaft mixing mechanism for mixing grout is provided inside the mixing chamber, a hopper for feeding grouting raw materials is provided at the front end of the drum cover, a hopper for feeding grouting materials is provided inside the hopper, a propulsion mechanism for propulsing grout is provided below the mixing drum, the propulsion mechanism includes a propulsion pipe, a flow guiding mechanism for guiding the grout at the end of the propulsion pipe away from the mixing drum, the flow guiding mechanism includes a flow guiding pipe, and an anti-segregation mechanism for secondary mixing to prevent segregation is provided at the end of the flow guiding mechanism away from the propulsion mechanism.

[0007] Furthermore, the dual-shaft stirring mechanism includes a first rotating shaft, a second rotating shaft on one side of the first rotating shaft, the first rotating shaft and the second rotating shaft are symmetrically arranged along the inside of the stirring chamber, two sets of drive motors are symmetrically arranged at the upper end of the cylinder cover, the upper ends of the first rotating shaft and the second rotating shaft both pass through the cylinder cover and are connected to the two sets of drive motors, and two sets of stirring holes corresponding to the first rotating shaft and the second rotating shaft are opened through the surface of the cylinder cover.

[0008] Furthermore, the outer end of the first rotating shaft is surrounded by multiple sets of first stirring blades, and the outer end of the second rotating shaft is surrounded by multiple sets of second stirring blades, with the multiple sets of first stirring blades and the multiple sets of second stirring blades arranged alternately.

[0009] Furthermore, an electric regulating valve is provided at the lower end of the mixing drum, and a connecting pipe is provided above the outer end of the propulsion pipe away from the guide pipe. The lower end of the connecting pipe is connected to the propulsion pipe, and the upper end of the connecting pipe is connected to the electric regulating valve.

[0010] Furthermore, a screw is installed inside the propulsion tube, and a propulsion motor connected to the screw is installed on the outside of the end of the propulsion tube near the mixing drum.

[0011] Furthermore, both ends of the guide tube are provided with a first connecting flange ring, and multiple sets of spiral strips are arranged around the inside of the guide tube.

[0012] Furthermore, both ends of the anti-segregation tube are provided with a second connecting flange ring corresponding to the first connecting flange ring, and a motor base is provided at the center of the upper part of the outer end of the anti-segregation tube.

[0013] Furthermore, a transmission hole is provided in the center of the motor base, a servo motor is provided above the motor base, an output shaft is provided at the lower end of the servo motor, the lower end of the output shaft extends through the transmission hole into the interior of the anti-segregation tube, a third rotating shaft is provided at the lower end of the output shaft, and three sets of third stirring blades are arranged around the outer end of the third rotating shaft.

[0014] The beneficial effects are that, compared to existing grouting devices, which are prone to insufficient mixing and poor uniformity of raw materials, and are highly susceptible to segregation, this application, through the staggered mixing design of the dual-shaft mixing mechanism, ensures more thorough and uniform mixing of grouting materials, effectively improving the quality of the grout. The uniform grout can better fill rock fissures, improve the cementation quality and impermeability of the rock mass, thereby enhancing the overall stability of the tunnel. The spiral strip of the flow guiding mechanism, combined with the secondary mixing design of the anti-segregation mechanism, effectively prevents segregation of the grout during transmission, avoiding the decline in grouting quality caused by segregation, and ensuring the consistency and reliability of the grouting effect. The screw of the propulsion mechanism, in conjunction with the propulsion motor, can stably propel the mixed grout forward. Compared to other propulsion methods, this screw propulsion method has better continuity and stability, and can precisely control the propulsion speed and pressure of the grout according to grouting requirements. Simultaneously, the spiral structure of the screw can play a certain role in stirring the grout, preventing local sedimentation or segregation during propulsion, and ensuring the uniformity of the grout during transmission. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the rock mass grouting device for a pumped storage power station tunnel according to the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the stirring cylinder and cylinder cover of this utility model;

[0017] Figure 3 This is a three-dimensional structural diagram of the dual-shaft stirring mechanism of this utility model;

[0018] Figure 4 This is a schematic cross-sectional view of the grouting propulsion mechanism of this utility model;

[0019] Figure 5 This is a three-dimensional structural diagram of the guide tube of this utility model;

[0020] Figure 6 This is a three-dimensional structural diagram of the anti-segregation mechanism of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Mixing drum; 101. Mixing chamber; 2. Drum cover; 201. Mixing hole; 3. Dual-shaft mixing mechanism; 301. First rotating shaft; 302. Second rotating shaft; 303. First mixing blade; 304. Second mixing blade; 305. Drive motor; 4. Injection hopper; 401. Injection trough; 5. Grouting propulsion mechanism; 501. Propulsion pipe; 502. Propulsion motor; 503. Connecting pipe; 504. Screw; 6. Flow guiding mechanism; 601. Flow guiding pipe; 602. First connecting flange ring; 603. Spiral strip; 7. Anti-segregation mechanism; 701. Anti-segregation pipe; 702. Second connecting flange ring; 703. Motor base; 704. Servo motor; 705. Third rotating shaft; 706. Third mixing blade; 8. Electric regulating valve. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0023] Pumped storage power stations play a vital role in the power system, including peak shaving, valley filling, frequency regulation, phase regulation, and emergency backup. As a key component of the water conveyance system of pumped storage power stations, the stability and impermeability of the rock mass in tunnels directly affect the safe operation and efficiency of the power station. Tunnel rock mass grouting is an important engineering measure. By injecting grout into the fissures and pores of the rock mass, the physical and mechanical properties of the rock mass are improved, thereby enhancing its integrity, strength, and impermeability.

[0024] Pumped storage power station tunnels often traverse areas with complex geological conditions. The rock mass may have defects such as joints, fissures, and faults, resulting in poor rock mass integrity and low strength. The primary purpose of grouting is to fill these fissures and pores with grout, cementing the discrete rock mass into a whole, improving the compressive and shear strength of the rock mass, and enhancing its bearing capacity to withstand various loads during tunnel construction and operation, such as surrounding rock pressure and internal water pressure. For example, in a certain pumped storage power station, by performing consolidation grouting on the surrounding rock of the tunnel, the elastic modulus of the rock mass was increased by 30%-50%, effectively improving the mechanical properties of the rock mass and ensuring the stability of the tunnel.

[0025] Because pumped storage power stations operate under high water pressure inside the tunnels, insufficient rock impermeability can lead to significant water seepage, wasting water resources and potentially causing problems such as rising groundwater levels and mountain instability. Grouting can form a continuous impermeable curtain within the rock mass, reducing its permeability, cutting off or reducing seepage channels, preventing water from seeping out, and ensuring the normal operation of the power station and the safety of the surrounding environment. For example, during the construction of a certain power station, curtain grouting reduced the permeability coefficient of the rock mass surrounding the tunnel by two orders of magnitude, effectively solving the seepage problem.

[0026] Before grouting, a detailed geological survey of the tunnel route is required, including the rock mass structure, the degree of joint and fissure development, rock type, and groundwater conditions. This geological survey provides an accurate basis for grouting design, determining parameters such as grouting type, borehole layout, grouting pressure, and grout materials. For example, ground-penetrating radar and core drilling were used to survey the surrounding rock of a pumped-storage power station tunnel, clarifying the geological characteristics of different sections and laying the foundation for subsequent grouting construction plans. Based on the grouting design requirements, the necessary grouting materials, such as cement, admixtures, and additives, are prepared. Ordinary Portland cement with a strength grade of not less than 42.5 is generally selected. The types and amounts of admixtures and additives are determined according to specific project requirements to improve grout performance, such as fluidity, setting time, and aggregate strength. Simultaneously, the quality of the materials is rigorously inspected to ensure compliance with relevant standards and design requirements.

[0027] After grouting is completed, the grouting holes must be sealed to prevent water and air from the rock mass from entering the holes and affecting the grouting effect. The sealing material is generally cement mortar, and its strength grade is not lower than that of the lining concrete. When sealing the holes, the cement mortar is injected into the holes under pressure until grout overflows from the hole opening. Then, the cement mortar is tamped with a tamping tool to ensure that the hole is sealed tightly.

[0028] Example

[0029] like Figures 1-6As shown, the grouting device for the tunnel rock mass of a pumped storage power station includes a mixing drum 1, a drum cover 2, a twin-shaft mixing mechanism 3, a hopper 4, a grouting propulsion mechanism 5, a flow guiding mechanism 6, and an anti-segregation mechanism 7. The mixing drum 1 has a mixing chamber 101 inside, and a drum cover 2 is located above the mixing drum 1. The mixing chamber 101 contains a twin-shaft mixing mechanism 3 for mixing grout. The front end of the drum cover 2 has a hopper 4 for feeding grouting materials. The hopper 4 has a groove 401 inside. Below the mixing drum 1 is a propulsion mechanism for propelling the grout for grouting. The propulsion mechanism includes a propulsion pipe 501. At the end of the propulsion pipe 501 away from the mixing drum 1, a flow guiding mechanism 6 is provided to guide the grout flow. The flow guiding mechanism 6 includes a flow guiding pipe 601, and at the end of the flow guiding mechanism 6 away from the propulsion mechanism, an anti-segregation mechanism 7 is provided for secondary mixing to prevent segregation.

[0030] The dual-shaft mixing mechanism 3 includes a first rotating shaft 301 and a second rotating shaft 302 on one side of the first rotating shaft 301. The first rotating shaft 301 and the second rotating shaft 302 are symmetrically arranged along the interior of the mixing chamber 101. Two sets of drive motors 305 are symmetrically arranged at the upper end of the cylinder cover 2. The upper ends of the first rotating shaft 301 and the second rotating shaft 302 pass through the cylinder cover 2 and are connected to the two sets of drive motors 305. Two sets of mixing holes 201 corresponding to the first rotating shaft 301 and the second rotating shaft 302 are opened through the surface of the cylinder cover 2. Through the cooperation of the first rotating shaft 301 and the second rotating shaft 302, staggered mixing paths can be formed in the mixing chamber 101, so that the grouting materials are fully mixed under the action of forces in different directions, effectively avoiding the mixing dead corners that are easy to occur in single-shaft mixing, and significantly improving the uniformity of material mixing.

[0031] Multiple sets of first stirring blades 303 are arranged around the outer end of the first rotating shaft 301, and multiple sets of second stirring blades 304 are arranged around the outer end of the second rotating shaft 302. The multiple sets of first stirring blades 303 and multiple sets of second stirring blades 304 are arranged alternately. The alternating arrangement of multiple sets of first stirring blades 303 and multiple sets of second stirring blades 304 greatly increases the shearing and kneading effect on the raw materials during the stirring process.

[0032] An electric regulating valve 8 is provided at the lower end of the mixing drum 1. A connecting pipe 503 is provided above the outer end of the propulsion pipe 501 away from the guide pipe 601. The lower end of the connecting pipe 503 is connected to the propulsion pipe 501, and the upper end of the connecting pipe 503 is connected to the electric regulating valve 8. The flow rate and speed of the mixed slurry flowing into the propulsion pipe 501 can be precisely controlled by the electric regulating valve 8 at the lower end of the mixing drum 1. In the grouting operation, the output of the slurry can be flexibly adjusted according to the actual needs, which can ensure the stability and controllability of the grouting process.

[0033] The inside of the propulsion tube 501 is equipped with a screw 504. The outside of the end of the propulsion tube 501 near the mixing drum 1 is equipped with a propulsion motor 502 connected to the screw 504. The screw 504 rotates under the drive of the propulsion motor 502, which can stably propel the mixed slurry forward. At the same time, the spiral structure of the screw 504 can play a certain role in stirring the slurry, preventing local sedimentation or segregation during the propulsion process.

[0034] Both ends of the guide pipe 601 are provided with a first connecting flange ring 602. Multiple sets of spiral strips 603 are arranged inside the guide pipe 601. When the slurry passes through the guide pipe 601, the multiple sets of spiral strips 603 inside the guide pipe 601 will cause the slurry to generate spiral flow. This spiral flow can further disperse the particles in the slurry and prevent the slurry from segregating due to factors such as changes in flow rate during the guiding process.

[0035] Both ends of the anti-segregation tube 701 are provided with a second connecting flange 702 corresponding to the first connecting flange 602. A motor base 703 is provided at the center of the upper part of the outer end of the anti-segregation tube 701. The second connecting flanges 702 at both ends of the anti-segregation tube 701 correspond to the first connecting flanges 602 of the guide tube 601, which facilitates the quick connection and disassembly of the anti-segregation tube 701 and the guide mechanism 6.

[0036] A transmission hole is provided in the center of the motor base 703. A servo motor 704 is installed above the motor base 703. An output shaft is provided at the lower end of the servo motor 704. The lower end of the output shaft extends through the transmission hole into the interior of the anti-segregation tube 701. A third rotating shaft 705 is provided at the lower end of the output shaft. Three sets of third stirring blades 706 are arranged around the outer end of the third rotating shaft 705. The servo motor 704 drives the third rotating shaft 705 and the third stirring blades 706 to rotate through the output shaft, performing secondary stirring before the slurry is injected into the rock mass. This secondary stirring can effectively solve the segregation problem that may occur during the slurry transmission process.

[0037] During the operation, the workers first put an appropriate amount of grouting material into the mixing chamber 101 through the hopper 4. Then, they start two sets of drive motors 305. The drive motors 305 drive the first rotating shaft 301 and the second rotating shaft 302 to rotate, so that the first stirring blade 303 and the second stirring blade 304 are stirred alternately in the mixing chamber 101 to fully mix the grouting material and form a uniform grouting slurry.

[0038] After mixing is completed, the staff opens the electric regulating valve 8 and adjusts the opening of the electric regulating valve 8 according to the actual grouting needs to control the flow rate and speed of the grout flowing into the propulsion pipe 501. The mixed grout enters the propulsion pipe 501 through the electric regulating valve 8 and the connecting pipe 503. The propulsion motor 502 drives the screw 504 to rotate, which steadily propels the grout forward.

[0039] After the slurry enters the guide pipe 601, it generates a spiral flow under the action of the spiral strip 603, which further disperses the particles in the slurry. When the slurry reaches the anti-segregation pipe 701, the servo motor 704 is started. The servo motor 704 drives the third rotating shaft 705 and the third stirring blade 706 to rotate through the output shaft, which performs secondary stirring of the slurry and prevents slurry segregation.

[0040] The grout, after being thoroughly stirred and treated to prevent segregation, is injected into the tunnel rock mass through a grouting head connected to the anti-segregation pipe 701, thus completing the grouting operation.

[0041] The working principle is as follows: In the dual-shaft mixing mechanism 3, two sets of drive motors 305 drive the first rotating shaft 301 and the second rotating shaft 302 respectively. Since the two are symmetrically arranged along the inside of the mixing chamber 101, and the first mixing blade 303 and the second mixing blade 304 are staggered, an interlaced mixing path is formed in the mixing chamber 101. The forces in different directions allow the grouting materials to be fully mixed, avoiding mixing dead corners, increasing shearing and kneading effects, and improving the mixing uniformity. The electric regulating valve 8 can accurately control the flow rate and speed of the grout flowing into the propulsion pipe 501 to meet the needs of different grouting scenarios. The propulsion motor 502 drives the screw 504 to rotate. The spiral structure of the screw 504 not only propels the slurry stably but also agitates it, preventing sedimentation or segregation during propulsion. In the flow guiding mechanism 6, the spiral strips 603 inside the flow guiding pipe 601 cause the slurry to flow in a spiral pattern as it passes through. This flow pattern increases the turbulence of the slurry, disperses the particles in the slurry, and prevents particle settling and stratification. In the anti-segregation mechanism 7, the servo motor 704 drives the third stirring blade 706 to rotate, which performs secondary agitation on the slurry about to be injected into the rock mass, further destroying any segregation structures that may form and ensuring the uniformity of the slurry.

[0042] Its beneficial effects are significant. Through the staggered mixing design of the dual-shaft mixing mechanism 3, the grouting materials are mixed more thoroughly and evenly, effectively improving the quality of the grout. The uniform grout can better fill the rock fissures, improve the cementation quality and impermeability of the rock mass, thereby enhancing the overall stability of the tunnel. Through the secondary mixing design of the spiral strip 603 of the flow guiding mechanism 6 and the anti-segregation mechanism 7, segregation of the grout during the transmission process is effectively prevented, avoiding the problem of reduced grouting quality caused by grout segregation, and ensuring the consistency and reliability of the grouting effect. Through the screw 504 of the propulsion mechanism and the propulsion motor 502, the well-mixed grout can be stably pushed forward. Compared with other propulsion methods, this screw 504 propulsion method has better continuity and stability. The propulsion speed and pressure of the grout can be precisely controlled according to the grouting requirements. At the same time, the spiral structure of the screw 504 can play a certain role in stirring the grout, preventing local sedimentation or segregation during the propulsion process, and ensuring the uniformity of the grout during the transmission process.

Claims

1. A device for grouting the rock mass of a tunnel of a pumped storage power station, comprising a mixing drum (1); characterized in that, It also includes a cylinder cover (2), a twin-shaft stirring mechanism (3), a hopper (4), a grouting propulsion mechanism (5), a flow guiding mechanism (6), and an anti-segregation mechanism (7); the mixing cylinder (1) has a mixing chamber (101) inside, a cylinder cover (2) is provided above the mixing cylinder (1), a twin-shaft stirring mechanism (3) for stirring grouting is provided inside the mixing chamber (101), a hopper (4) for feeding grouting raw materials is provided at the front end of the surface of the cylinder cover (2), a trough (401) is provided inside the hopper (4), a propulsion mechanism for propulsing grout is provided below the mixing cylinder (1), the propulsion mechanism includes a propulsion pipe (501), a flow guiding mechanism (6) for guiding the grout is provided at the end of the propulsion pipe (501) away from the mixing cylinder (1), the flow guiding mechanism (6) includes a flow guiding pipe (601), and an anti-segregation mechanism (7) for secondary stirring to prevent segregation is provided at the end of the flow guiding mechanism (6) away from the propulsion mechanism.

2. The device according to claim 1, characterized in that, The dual-shaft stirring mechanism (3) includes a first rotating shaft (301), and a second rotating shaft (302) is provided on one side of the first rotating shaft (301). The first rotating shaft (301) and the second rotating shaft (302) are symmetrically arranged along the inside of the stirring chamber (101). Two sets of drive motors (305) are symmetrically arranged at the upper end of the cylinder cover (2). The upper ends of the first rotating shaft (301) and the second rotating shaft (302) pass through the cylinder cover (2) and are connected to the two sets of drive motors (305). Two sets of stirring holes (201) corresponding to the first rotating shaft (301) and the second rotating shaft (302) are opened through the surface of the cylinder cover (2).

3. The device according to claim 2, characterized in that, The outer end of the first rotating shaft (301) is surrounded by multiple sets of first stirring blades (303), and the outer end of the second rotating shaft (302) is surrounded by multiple sets of second stirring blades (304). The multiple sets of first stirring blades (303) and multiple sets of second stirring blades (304) are arranged alternately.

4. The device according to claim 1, characterized in that, An electric regulating valve (8) is provided at the lower end of the mixing drum (1). A connecting pipe (503) is provided above the outer end of the propulsion pipe (501) away from the guide pipe (601). The lower end of the connecting pipe (503) is connected to the propulsion pipe (501), and the upper end of the connecting pipe (503) is connected to the electric regulating valve (8).

5. The device according to claim 4, characterized in that, The inside of the propulsion tube (501) is provided with a screw (504), and the outside of the end of the propulsion tube (501) near the stirring tank (1) is provided with a propulsion motor (502) connected to the screw (504).

6. The device according to claim 1, characterized in that, Both ends of the guide tube (601) are provided with a first connecting flange ring (602), and multiple sets of spiral strips (603) are arranged around the inside of the guide tube (601).

7. The device according to claim 2, characterized in that, Both ends of the anti-segregation tube (701) are provided with a second connecting flange ring (702) corresponding to the first connecting flange ring (602), and a motor base (703) is provided at the center of the upper part of the outer end of the anti-segregation tube (701).

8. The device according to claim 7, characterized in that, A transmission hole is provided in the center of the motor base (703). A servo motor (704) is provided above the motor base (703). An output shaft is provided at the lower end of the servo motor (704). The lower end of the output shaft extends through the transmission hole into the interior of the anti-segregation tube (701). A third rotating shaft (705) is provided at the lower end of the output shaft. Three sets of third stirring blades (706) are arranged around the outer end of the third rotating shaft (705).

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