A tunnel shotcrete rebound recovery device

Abstract

This invention discloses a tunnel shotcrete rebound recovery device, which includes a transport vehicle equipped with a collection device for collecting rebounded concrete, a mixing device for thoroughly mixing the collected concrete, and a compensation device for compensating the mixed concrete with slurry. The collection device includes a collection funnel with two aggregate plates inclined to both sides, and a storage bin at the bottom of the collection funnel. The mixing device includes a mixing drum driven by a drive motor, with an inlet and an outlet at both ends of the mixing drum. A conveying mechanism is provided between the storage bin and the inlet to transport a fixed amount of concrete from the storage bin to the mixing drum. A discharge funnel is located below the outlet, and a pump is located below the discharge funnel, with a conveying pipe at the outlet end of the pump. This solution enables automated recovery and utilization of rebounded concrete, avoiding resource waste.

Description

Technical Field

[0001] This invention relates to the technical field, specifically to a tunnel shotcrete rebound recovery device and its recovery method. Background Technology

[0002] Currently, in tunnel construction, the initial support shotcrete application is usually done using the wet spraying method. The wet spraying method has the advantages of easy control of water-cement ratio, low dust content, and good safety. However, in some tunnels where the adhesion between the surrounding rock interface and the shotcrete is poor, the amount of rebound during construction is large, resulting in serious waste of resources, especially at the arch position. The problem of severe rebound of shotcrete has been difficult to solve.

[0003] In response to this phenomenon, many researchers have improved the shotcrete process, such as adjusting the spraying angle and distance, to increase concrete utilization. Other researchers have studied the mix design of shotcrete materials, such as adding fibers or other admixtures to improve the adhesion of the concrete. In short, solving the problem of severe shotcrete rebound requires comprehensive consideration of multiple factors, including process, materials, and structure. These methods can effectively alleviate concrete rebound, but they cannot fundamentally solve the problem of resource waste caused by concrete rebound. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a tunnel shotcrete rebound recovery device and its recovery method, which solves the problem of resource waste caused by severe shotcrete rebound.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] Firstly, a tunnel shotcrete rebound recovery device is provided, comprising a transport vehicle equipped with a collection device for collecting rebounded concrete, a mixing device for thoroughly mixing the collected concrete, and a compensation device for compensating the mixed concrete with slurry. The collection device includes a collection funnel, which includes two aggregate plates inclined to both sides, and a storage bin at the bottom of the collection funnel. The mixing device includes a mixing drum driven by a drive motor, with an inlet and an outlet at both ends of the mixing drum. A conveying mechanism is provided between the storage bin and the inlet for transporting a fixed amount of concrete from the storage bin to the mixing drum. A discharge funnel is provided below the outlet, and a pump is provided below the discharge funnel, with a conveying pipe at the outlet end of the pump.

[0007] Furthermore, an extension plate parallel to the aggregate plate is slidably provided on the outer side of the two aggregate plates, a support is provided on the outer side of the storage bin, and a telescopic cylinder is provided on the support. The fixed end of the telescopic cylinder is hinged to the support, and the telescopic end of the telescopic cylinder is hinged to the outer side of the extension plate.

[0008] Furthermore, the conveying mechanism includes a triangular support, a collection funnel is set on the top of the triangular support, the triangular support includes an inclined surface, a conveying track is set on the inclined surface, a feeding bin that can move along the conveying track is set on the conveying track, the top of the feeding bin located at the upper end of the conveying track is connected to the bottom of the storage bin, the feeding bin located at the lower end of the conveying track is set at the inlet, and a first electric switch door is set at the bottom of the storage bin, and a pressure sensor for measuring the weight of concrete in the storage bin is set on the first electric switch door.

[0009] Furthermore, the bottom surface of the feeding hopper is an inclined pouring surface, and a second electric switch door is provided on the side of the feeding hopper located at the lower end of the pouring surface.

[0010] Furthermore, the mixing drum is supported by two parallel rotating rods, and the side of the mixing drum is in rolling contact with the two rotating rods. The rotating rods are connected to the transmission gear, and the transmission gear is connected to the drive motor through a chain.

[0011] Furthermore, the compensation device includes a mixing chamber, above which a cement silo and a water tank are connected, and on / off control valves are installed on the connecting pipes of the mixing chamber to the cement silo and the water tank respectively. A discharge pipe extending to the inlet is provided at the bottom of the mixing chamber, and a flow control valve is installed on the discharge pipe.

[0012] Secondly, a recycling method for a tunnel shotcrete rebound recycling device is provided, which includes the following steps:

[0013] S1: Drive the transport vehicle until the collection device is moved directly below the strip crack where the shotcrete rebounds and falls, so that the rebounded concrete is collected into the storage bin through the collection funnel.

[0014] S2: A fixed quantity of concrete is transported from the storage silo to the mixing drum via a conveying mechanism;

[0015] S3: Grout compensation is performed on the concrete inside the mixing drum using a compensation device;

[0016] S4: Turn on the drive motor and mix the concrete through the mixing drum until the concrete in the mixing drum reaches the predetermined requirements.

[0017] S5: After mixing, the concrete is discharged from the outlet and then transported to the wet spraying trolley for secondary spraying via the discharge funnel, pump and delivery pipe.

[0018] Furthermore, step S1 specifically includes:

[0019] A1: Drive the transport vehicle until the collection funnel is directly below the strip-shaped slot and the opening of the collection funnel is parallel to the strip-shaped slot;

[0020] A2: Drive the telescopic cylinder to extend, and the expansion plate extends to both sides of the aggregate plate until the strip gap is located in the middle between the expansion plates on both sides.

[0021] Furthermore, step S2 specifically includes:

[0022] B1: When the concrete in the storage silo reaches the set storage capacity, the pressure sensor outputs a signal and opens the first electric door, allowing the concrete to fall into the feeding silo.

[0023] B2: Drive the feeding hopper to move along the conveying track to the inlet, open the second electric switch door, and slide the concrete in the feeding hopper into the mixing drum.

[0024] Furthermore, step S3 also includes:

[0025] C1: Sample the rebounded concrete, and determine the parameters of the slurry and the compensation amount based on the parameters of the sampling results and the amount of concrete delivered by the feeding hopper.

[0026] C2: Determine the ratio and amount of water and cement to be added to the mixing chamber based on the parameters and compensation amount of the slurry.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. This invention innovatively changes the traditional method of improving the bonding performance of concrete. Starting from the idea of ​​collecting rebound and falling concrete, it can fundamentally solve the problem of concrete rebound. Not only can the sprayed and fallen concrete be reused, but it can also be used for various purposes such as arch filling and slope protection, which has a wide range of application options and greatly improves construction efficiency and convenience.

[0029] 2. This solution expands the opening of the collection funnel by extending the expansion plate, making it easier to match the strip-shaped gaps where the shotcrete rebounds and falls, so that the rebounded shotcrete falls into the collection funnel as much as possible, achieving large-scale recycling of the rebounded concrete.

[0030] 3. This solution, through the coordination of the first electric door, pressure sensor, and feeding hopper, enables the quantitative transport of concrete from the storage hopper to the mixing drum. This facilitates the subsequent compensation device's control over the amount of concrete used for slurry compensation within the mixing drum, ensuring that the mixed concrete easily meets preset requirements. The mixed concrete is then directly used via pump and delivery pipe, eliminating the need for additional processing of the collected concrete. This achieves automatic collection, mixing, processing, transportation, and use of rebound concrete. During implementation, only the parameters need to be set in advance, and the remaining steps can be automated, thereby saving labor and improving production efficiency.

[0031] 4. This solution, through the coordination of cement silos, water tanks, and switch control valves, can achieve the adjustment and control of slurry parameters in the mixing chamber, and can achieve the adjustment and control of slurry compensation amount through flow control valves. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a tunnel shotcrete rebound recovery device.

[0033] Figure 2 This is a schematic diagram of the stirring device.

[0034] Figure 3 This is a schematic diagram of the collection device.

[0035] Figure 4 This is a schematic diagram of the transportation mechanism.

[0036] Figure 5 This is a schematic diagram of the compensation device.

[0037] Among them, 1. Collection device, 11. Collection funnel, 12. Storage bin, 13. Feeding bin, 14. Telescopic cylinder, 15. Extension plate, 16. Collection plate, 17. Triangular bracket, 18. Inclined surface, 19. Transport track, 110. Support, 111. Discharge surface, 2. Compensation device, 21. Mixing bin, 22. Cement bin, 23. Water tank, 24. Switch control valve, 25. Discharge pipeline, 26. Flow control valve, 3. Mixing device, 31. Inlet, 32. Mixing drum, 33. Discharge outlet, 34. Drive motor, 35. Transmission gear, 36. Rotating rod, 4. Discharge funnel, 5. Pump, 6. Conveying pipe, 7. Transport vehicle. Detailed Implementation

[0038] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0039] Example 1

[0040] like Figure 1 and Figure 2 As shown, the tunnel shotcrete rebound recovery device of this scheme includes a transport vehicle 7, which is equipped with a collection device 1, a mixing device 3 and a compensation device 2. The collection device 1 includes a collection funnel 11, which includes two aggregate plates 16 that are inclined to both sides respectively. A storage bin 12 is provided at the bottom of the collection funnel 11.

[0041] The mixing device 3 includes a mixing drum 32, which is supported by two parallel rotating rods 36. The side of the mixing drum 32 is in rolling contact with the two rotating rods 36. The rotating rods 36 are connected to the transmission gear 35, which is connected to the drive motor 34 via a chain. The two ends of the mixing drum 32 are respectively provided with a feed inlet 31 and a discharge outlet 33.

[0042] A conveying mechanism is provided between the storage bin 12 and the inlet 31. A discharge hopper 4 is provided below the outlet 33. A pump 5 is provided below the discharge hopper 4. A conveying pipe 6 is provided at the discharge end of the pump 5.

[0043] This solution collects the rebounded concrete using a collection device 1, transports a fixed amount of concrete from the storage bin 12 to the mixing drum 32 via a conveying mechanism, and simultaneously compensates the concrete with slurry using a compensation device 2, ensuring that the mixed concrete meets the preset requirements. The mixed concrete is then transported to a wet spraying trolley via a conveying pipe 6 for secondary spraying, thereby achieving automated recycling and utilization of concrete and avoiding resource waste.

[0044] Example 2

[0045] like Figure 3As shown, this embodiment is a further limitation based on embodiment 1. An extension plate 15 parallel to the aggregate plate 16 is slidably arranged on the outer side of the two aggregate plates 16. A support 110 is arranged on the outer side of the storage bin 12. A telescopic cylinder 14 is arranged on the support 110. The fixed end of the telescopic cylinder 14 is hinged to the support 110, and the telescopic end of the telescopic cylinder 14 is hinged to the outer side of the extension plate 15. In this solution, the opening of the collection funnel 11 is enlarged by the extension of the extension plate 15, so as to match the strip-shaped gap where the shotcrete rebounds and falls, so that the rebounded shotcrete falls into the collection funnel 11 as much as possible, realizing the large-scale recycling of rebounded concrete. At the same time, the extension plate 15 can be retracted to both sides of the aggregate plate 16 to avoid the transport vehicle 7 being affected by excessive height in its movement in the tunnel.

[0046] Example 3

[0047] like Figure 4 As shown, this embodiment provides a specific scheme for the conveying mechanism based on embodiment 1. The conveying mechanism includes a triangular bracket 17, and a collecting funnel 11 is fixed to the top of the triangular bracket 17 by bolts. The triangular bracket 17 includes an inclined surface 18, and a conveying track 19 is provided on the inclined surface 18. A feeding bin 13 that can move along the conveying track 19 is provided on the conveying track 19. In the design, a drive wheel that cooperates with the conveying track 19 is provided on the feeding bin 13. The drive wheel is driven by a motor and makes the feeding bin 13 move on the conveying track 19.

[0048] The bottom of the storage hopper 12 is equipped with a first electric switch door, which is equipped with a pressure sensor. The top of the feeding hopper 13, located at the upper end of the conveying track 19, is connected to the bottom of the storage hopper 12. When the first electric switch door is opened, the concrete in the storage hopper 12 can fall into the feeding hopper 13. The feeding hopper 13, located at the lower end of the conveying track 19, is located at the inlet 31. The bottom surface of the feeding hopper 13 is an inclined pouring surface 111. A second electric switch door is provided on the side of the feeding hopper 13 located at the lower end of the pouring surface 111. When the second electric switch door is opened, the concrete in the feeding hopper 13 can automatically slide down the pouring surface 111 into the mixing drum 32.

[0049] This solution, through the cooperation of the first electric door, pressure sensor, and feeding hopper 13, enables the quantitative transport of concrete from the storage hopper 12 to the mixing drum 32. This facilitates the subsequent control of the amount of concrete used by the compensation device 2 when compensating for slurry in the mixing drum 32, making it easier for the mixed concrete to meet the preset requirements. The mixed concrete is then directly put into use via pump 5 and conveying pipe 6, eliminating the need for additional processing of the collected concrete. This achieves automatic collection, mixing, processing, transportation, and use of rebound concrete. During implementation, only the parameters need to be set in advance, and the remaining steps can be automated, thereby saving labor and improving production efficiency.

[0050] Example 4

[0051] like Figure 5 As shown, this embodiment, based on embodiment 1, provides a specific scheme for the compensation device 2. The compensation device 2 includes a mixing chamber 21, with a cement silo 22 and a water tank 23 connected to the top of the mixing chamber 21. Switch control valves 24 are installed on the connecting pipes of the mixing chamber 21 to the cement silo 22 and the water tank 23, respectively. A discharge pipe 25 extending to the inlet 31 is provided at the bottom of the mixing chamber 21, and a flow control valve 26 is installed on the discharge pipe 25. Through the cooperation of the cement silo 22, the water tank 23 and the switch control valve 24, the parameters of the slurry in the mixing chamber 21 can be adjusted and controlled, and the amount of slurry compensation can be adjusted and controlled through the flow control valve 26.

[0052] Specifically, the control switch of the compensation device 2 is set on the conveying track 19. When the feeding bin 13 reaches the feed inlet 31, the control switch of the compensation device 2 is triggered, thereby realizing automatic compensation of the slurry.

[0053] In conjunction with embodiments 1-4 above, this solution also provides a recycling method for a tunnel shotcrete rebound recycling device, which includes the following steps:

[0054] S1: Drive the transport vehicle 7 until the collection device 1 is moved directly below the strip-shaped leak where the shotcrete rebounds and falls, so that the rebounded concrete is collected through the collection funnel 11 into the storage bin 12, specifically including:

[0055] A1: Drive the carrier vehicle 7 until the collection funnel 11 is directly below the strip-shaped slot and the opening of the collection funnel 11 is parallel to the strip-shaped slot;

[0056] A2: Drive the telescopic cylinder 14 to extend, and the extension plate 15 extends to both sides of the collection plate 16 until the strip-shaped slit is located in the middle between the extension plates 15 on both sides, so that the concrete falling from the strip-shaped slit can slide down the extension plate 15 into the collection funnel 11.

[0057] S2: The concrete quantity stored in the storage silo 12 is transported to the mixing drum 32 by the conveying mechanism, which specifically includes:

[0058] B1: When the concrete in storage silo 12 reaches the set storage amount, the pressure sensor outputs a signal and opens the first electric switch door, and the concrete falls into the feeding silo 13.

[0059] B2: Drive the feeding bin 13 to move along the conveying track 19 to the inlet 31, open the second electric switch door, and let the concrete in the feeding bin 13 slide into the mixing drum 32.

[0060] S3: The concrete inside the mixing drum 32 is compensated with grout through the compensation device 2, which specifically includes:

[0061] C1: Sample the rebounded concrete, and determine the parameters of the slurry and the compensation amount based on the parameters of the sampling results and the amount of concrete transported by the feeding hopper 13.

[0062] C2: Determine the ratio and amount of water and cement to be added to the mixing chamber 21 based on the parameters and compensation amount of the slurry.

[0063] S4: Turn on the drive motor 34 to mix the concrete through the mixing drum 32 until the concrete in the mixing drum 32 reaches the predetermined requirements.

[0064] S5: After mixing, the concrete is discharged from the discharge port 33 and then transported to the wet spraying trolley for secondary spraying through the discharge funnel 4, pump 5 and conveying pipe 6.

Claims

1. A tunnel shotcrete rebound recovery device, characterized in that, It includes a transport vehicle, which is equipped with a collection device for collecting rebounded concrete, a mixing device for thoroughly mixing the collected concrete, and a compensation device for compensating the mixed concrete with slurry. The collecting device includes a collecting funnel, which includes two collecting plates that are inclined to both sides. A storage bin is provided at the bottom of the collecting funnel. The mixing device includes a mixing drum that is driven to rotate by a drive motor. An inlet and an outlet are provided at both ends of the mixing drum. A conveying mechanism for transporting a fixed amount of concrete in the storage bin to the mixing drum is provided between the storage bin and the inlet. A discharge funnel is provided below the outlet, and a pump is provided below the discharge funnel. A conveying pipe is provided at the discharge end of the pump. The conveying mechanism includes a triangular support, the collecting funnel is disposed on the top of the triangular support, the triangular support includes an inclined surface, a conveying track is disposed on the inclined surface, a feeding bin that can move along the conveying track is disposed on the conveying track, the top of the feeding bin located at the upper end of the conveying track is connected to the bottom of the storage bin, the feeding bin located at the lower end of the conveying track is disposed at the inlet, and a first electric switch door is disposed at the bottom of the storage bin, and a pressure sensor for measuring the weight of concrete in the storage bin is disposed on the first electric switch door; The compensation device includes a mixing chamber, above which a cement silo and a water tank are connected. Each of the connecting pipes between the mixing chamber and the cement silo and the water tank is equipped with a switch control valve. At the bottom of the mixing chamber, a discharge pipe extending to the inlet is provided, and a flow control valve is provided on the discharge pipe.

2. The tunnel shotcrete rebound recovery device according to claim 1, characterized in that, An extension plate parallel to the collection plate is slidably arranged on the outer side of the two collection plates. A support is provided on the outer side of the storage bin. A telescopic cylinder is provided on the support. The fixed end of the telescopic cylinder is hinged to the support, and the telescopic end of the telescopic cylinder is hinged to the outer side of the extension plate.

3. The tunnel shotcrete rebound recovery device according to claim 2, characterized in that, The bottom surface of the feeding hopper is an inclined pouring surface, and a second electric switch door is provided on the side of the feeding hopper located at the lower end of the pouring surface.

4. The tunnel shotcrete rebound recovery device according to claim 3, characterized in that, The stirring drum is supported by two parallel rotating rods, and the side of the stirring drum is in rolling contact with the two rotating rods. The rotating rods are connected to a transmission gear, and the transmission gear is connected to a drive motor via a chain.

5. The recovery method of the tunnel shotcrete rebound recovery device according to claim 4, characterized in that, Includes the following steps: S1: Drive the transport vehicle until the collection device is moved directly below the strip crack where the shotcrete rebounds and falls, so that the rebounded concrete is collected into the storage bin through the collection funnel. S2: A fixed quantity of concrete is transported from the storage silo to the mixing drum via a conveying mechanism; S3: Grout compensation is performed on the concrete inside the mixing drum using a compensation device; S4: Turn on the drive motor and mix the concrete through the mixing drum until the concrete in the mixing drum reaches the predetermined requirements. S5: After mixing, the concrete is discharged from the outlet and then transported to the wet spraying trolley for secondary spraying via the discharge funnel, pump and delivery pipe.

6. The recycling method according to claim 5, characterized in that, Step S1 specifically includes: A1: Drive the transport vehicle until the collection funnel is directly below the strip-shaped slot and the opening of the collection funnel is parallel to the strip-shaped slot; A2: Drive the telescopic cylinder to extend, and the expansion plate extends to both sides of the aggregate plate until the strip gap is located in the middle between the expansion plates on both sides.

7. The recycling method according to claim 6, characterized in that, Step S2 specifically includes: B1: When the concrete in the storage silo reaches the set storage capacity, the pressure sensor outputs a signal and opens the first electric door, allowing the concrete to fall into the feeding silo. B2: Drive the feeding hopper to move along the conveying track to the inlet, open the second electric switch door, and slide the concrete in the feeding hopper into the mixing drum.

8. The recycling method according to claim 7, characterized in that, Step S3 also includes: C1: Sample the rebounded concrete, and determine the parameters of the slurry and the compensation amount based on the parameters of the sampling results and the amount of concrete delivered by the feeding hopper. C2: Determine the ratio and amount of water and cement to be added to the mixing chamber based on the parameters and compensation amount of the slurry.

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