A high-drop vertical shaft shotcrete construction system

Abstract

The utility model discloses a high fall vertical shaft spouts concrete construction system, including the concrete chute pipe of the arrangement along the vertical shaft wall, the concrete chute pipe feed end is connected with the concrete conveying equipment, and the concrete chute pipe includes the multiple section chute pipe of flange connection in proper order, and every interval distance is provided with the buffer on the concrete chute pipe, and the discharge end of concrete chute pipe is connected with the chute of the inclined setting, and the discharge end of chute is connected to the feed hopper of compulsory mixer, and the discharge end of compulsory mixer is connected concrete injection mechanism through the conveying pipe. The application reduces the flow rate when the concrete vertical conveying through the buffer, and the spiral descending in the buffer promotes the re-mixing of aggregate and gel material, and then the concrete through the concrete chute pipe is conveyed to the compulsory mixer in the chute to carry out secondary mixing, further guarantees the full mixing of concrete material even, improves the workability of concrete, and guarantees the quality of spouts concrete.

Description

Technical Field

[0001] This utility model relates to the field of vertical shaft construction technology, specifically to a high-drop vertical shaft shotcrete construction system. Background Technology

[0002] In the construction of water conservancy and hydropower projects, anchor spraying support is a key construction link to ensure the stability of the surrounding rock. According to the construction specifications for anchor spraying support in water conservancy and hydropower projects, wet spraying concrete technology should be adopted for spraying concrete construction in water conservancy and hydropower projects to ensure construction quality.

[0003] The current conventional method for transporting shotcrete in vertical shafts in China is to use a transport and lifting system located at the shaft opening to transport the mixed finished concrete to the concrete construction surface inside the shaft via a concrete hoist. This process works well for shallower shafts, but if the shaft is too deep, the transportation time increases, and aggregate segregation can easily occur during transportation, affecting the quality of the concrete.

[0004] In recent years, the industry has gradually promoted the use of concrete chute conveying technology. In this process, concrete falls at high speed along the chute, greatly shortening the transportation time. However, new problems have arisen: due to the speed difference between the denser aggregates and the less dense cementitious materials (cement, mortar, etc.) in the concrete during vertical free fall, the concrete aggregates fall faster than the cementitious materials, which can also cause aggregate segregation quality problems. In addition, chute conveying is prone to blockage, and the post-blockage treatment is slow, costly, and poses significant safety risks. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a high-drop vertical shaft shotcrete construction system.

[0006] A high-drop vertical shaft shotcrete construction system includes a concrete chute arranged along the shaft wall. The inlet end of the concrete chute is connected to a concrete conveying device. The concrete chute includes multiple sections of chute connected by flanges in sequence. Buffers are connected to the flanges at intervals on the concrete chute. The outlet end of the concrete chute is connected to an inclined chute. The outlet end of the chute is connected to the feed hopper of a forced mixer. The outlet end of the forced mixer is connected to a concrete spraying mechanism through a conveying pipe.

[0007] A further technical solution is: the buffer includes a first connector, a first buffer chamber, a second buffer chamber and a second connector arranged sequentially from top to bottom. A first guide plate and a second guide plate are arranged in a spiral manner in the first buffer chamber and the second buffer chamber. The first guide plate and the second guide plate rotate in opposite directions, and the outlet of the first buffer chamber is connected to the inlet of the second buffer chamber.

[0008] A further technical solution is that the overall cross-sectional area of ​​the first buffer chamber and the second buffer chamber decreases from the middle to both ends along the axial direction, and the cross-sections of their inlet and outlet are square.

[0009] A further technical solution is: an observation port and a movable cover plate for opening and closing the observation port are provided on the upper side wall of the second buffer chamber. One side of the movable cover plate is hinged to the edge of the observation port by a hinge, and a locking element is provided between the other side of the movable cover plate and the upper side wall of the second buffer chamber.

[0010] A further technical solution is to install a flat vibrator on the lower side wall of the first buffer chamber.

[0011] A further technical solution is to install two support anchor rods on both sides of the flange at the connection of adjacent delivery pipes. One end of the support anchor rod is anchored to the well wall, and the other end extends horizontally to the bottom of the flange.

[0012] A further technical solution is: the concrete conveying equipment is a concrete pump truck or a concrete mixer truck, and the concrete spraying mechanism includes a concrete spraying machine and a concrete spraying robotic arm.

[0013] The beneficial effects of this utility model are: This application utilizes buffers spaced at intervals on the concrete chute to slow the vertical descent of concrete. The staggered spiral channels within the buffers agitate the concrete flow, promoting remixing of aggregates and cementitious materials. The concrete, after passing through the chute, is then conveyed via a chute to a forced mixer for secondary mixing, further ensuring thorough and uniform mixing of the concrete, improving its workability, and guaranteeing the quality of the shotcrete. The mixed concrete is then transported through a conveying pipe to the shotcrete spraying mechanism to complete the shotcrete operation.

[0014] This application, by setting an observation port and a plate vibrator on the buffer, allows the movable cover plate at the observation port to be opened when concrete blockage occurs. The blockage of the internal flow channel of the buffer can be viewed through the observation port, making it easier to determine the location of the blockage. Then, by starting the plate vibrator near the blockage point, the vibration effect of the plate vibrator can be used to clear the blockage. This method is convenient, flexible, low-cost, and highly safe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of vertical transportation of shotcrete; Figure 2 This is a schematic diagram of the concrete chute layout; Figure 3 This is a schematic diagram of a buffer; Figure 4 This is a schematic diagram of the first buffer chamber; Figure 5 This is a schematic diagram of the arrangement of the supporting anchor bolts.

[0016] In the picture: 1. Concrete chute; 2. Chute; 3. Forced mixer; 4. Concrete conveying equipment; 5. Concrete spraying mechanism; 6. Concrete spraying robot arm; 7. Conveying pipe; 8. Conveying pipe; 9. Buffer; 10. Flange; 11. First joint; 12. First buffer chamber; 13. Second buffer chamber; 14. Second joint; 15. First guide plate; 16. Second guide plate; 17. Observation port; 18. Movable cover plate; 19. Locking element; 20. Plate vibrator; 21. Support anchor. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0018] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] A high-drop vertical shaft shotcrete construction system, such as Figures 1-5As shown, the system includes: a concrete chute 1 arranged along the wall of the vertical shaft; the inlet end of the concrete chute 1 is connected to a concrete conveying device 4; the concrete conveying device 4 is located on the ground at the shaft opening; the concrete chute 1 includes multiple sections of conveying pipe 8 connected by flanges in sequence; buffers 9 are installed at intervals on the concrete chute 1; the buffers 9 are flanged to the conveying pipes 8 at both ends; the outlet end of the concrete chute 1 is connected to an inclined chute 2; the outlet end of the chute 2 is connected to the feed hopper of a forced mixer 3; the forced mixer 3 is located on a support platform; the outlet end of the forced mixer 3 is connected to a concrete spraying mechanism through a conveying pipe 7; the concrete spraying mechanism is located on a concrete spraying platform; and the support platform and the concrete spraying platform are fixedly arranged inside the vertical shaft.

[0021] Specifically, the conveying pipe 8 of the concrete chute 1 is made of DN219 steel pipe and is vertically fixed to the well wall. A buffer 9 is installed every 30m. The two ends of the buffer 9 are bolted to the conveying pipe 8 through flanges.

[0022] The buffer 9 includes a first connector 11, a first buffer chamber 12, a second buffer chamber 13, and a second connector 14 arranged sequentially from top to bottom. A first guide plate 15 and a second guide plate 16 are spirally arranged in the first buffer chamber 12 and the second buffer chamber 13, so that the first guide plate 15 and the second guide plate 16 form spiral feeding channels in the first buffer chamber 12 and the second buffer chamber 13, respectively, and the outlet of the first buffer chamber 13 is connected to the inlet of the second buffer chamber 13.

[0023] The overall cross-sectional area of ​​the first buffer chamber 12 and the second buffer chamber 13 decreases from the middle to both ends along the axial direction. The cross-sections of their inlet and outlet are square. The cross-sectional dimensions of the first buffer chamber 12 and the second buffer chamber 13 are larger than the cross-sectional dimensions of the conveying pipe 8.

[0024] The first connector 11, the first buffer chamber 12, the second buffer chamber 13, and the second connector 14 are connected by flanges in sequence. The first connector 11 and the second connector 14 are made of square and round connectors. The first and second connectors are connected to the conveying pipes at both ends through transition flanges.

[0025] When the concrete material passes through the buffer 9, because the cross-sectional size of the buffer chamber 9 is larger than that of the conveying pipe 8, and due to the inclined buffer of the first and second guide plates, the concrete falls in a spiral shape within the buffer 9, which reduces the flow rate of the concrete and promotes the remixing of aggregates and gel materials.

[0026] An observation port 17 and a movable cover plate 18 for opening and closing the observation port 17 are provided on the upper side wall of the second buffer chamber 13. One side of the movable cover plate 18 is hinged to the edge of the observation port 17, and a locking element 19 is provided between the other side of the movable cover plate 18 and the side wall of the upper chamber 17. The locking element 19 is used to lock the movable cover plate 18 to close the observation port 17. When it is found that the concrete chute 1 is not flowing smoothly and there is a blockage, the movable cover plate 18 of the buffer 9 can be opened, and the concrete material blockage inside the buffer 9 can be viewed through the observation port 17 to quickly determine the location of the blockage. After the observation is completed, the movable cover plate 18 is closed and fixed by the locking element 19. The size of the observation port 17 is set to facilitate observation of the size of the second buffer chamber 13. In one embodiment, the locking element 19 adopts a spring pin connection form, including a pin and a sleeve that interlock. The pin is fixed on the movable cover plate 18, and the sleeve is fixed on the upper side wall of the second buffer chamber 13. In another embodiment, the locking member 19 may also be a spring-loaded latch connection.

[0027] A plate vibrator 20 is installed on the lower side wall of the second buffer chamber 12. The base of the plate vibrator 20 is welded and fixed to the side wall of the second buffer chamber 12. The power supply of the plate vibrator 20 is directly connected through the vertical shaft power supply system arranged on the shaft wall. After the blockage point is determined, the plate vibrator 20 near the blockage point is activated. The vibration effect of the plate vibrator 20 is used to clear the concrete material, prevent long-term pipe blockage, and ensure the normal delivery of concrete material.

[0028] The concrete chute 1 is fixed by welding a bracket to the embedded parts in the well wall and using clamps for positioning. To further increase the overall structural stability of the concrete chute 1, two support anchor rods 21 are installed on both sides of the flange 10 at the connection of two adjacent conveying pipes 8. One end of the support anchor rod 21 is anchored to the well wall, and the other end extends horizontally to the bottom of the flange 10 to provide support. The support anchor rods 21 can effectively distribute the impact load generated at the pipe connection when concrete is vertically conveyed, reduce the concentrated stress on the flange 10 at the connection of the conveying pipes 8, and improve the stability of the entire concrete conveying pipeline.

[0029] Concrete conveying equipment 4 is a concrete pump truck or a concrete mixer truck. During use, workers are specifically assigned to release the material at the wellhead, and the release speed is strictly controlled. If pipe blockage occurs, the upper level is notified immediately to stop releasing material.

[0030] The concrete spraying mechanism includes a concrete spraying machine 5 and a concrete spraying robotic arm 6. The concrete material mixed by the forced mixer 3 is transported to the concrete spraying machine 5 through the conveying pipe 7, and then the concrete spraying machine 5 is transported to the concrete spraying robotic arm 6 through the spraying pipe to complete the concrete spraying operation.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-drop vertical shaft shotcrete construction system, characterized in that, It includes a concrete chute arranged along the wall of a vertical shaft. The inlet end of the concrete chute is connected to a concrete conveying device. The concrete chute consists of multiple sections of chute connected by flanges in sequence. A buffer is connected to the flange at intervals on the concrete chute. The outlet end of the concrete chute is connected to an inclined chute. The outlet end of the chute is connected to the feed hopper of a forced mixer. The outlet end of the forced mixer is connected to a concrete spraying mechanism through a conveying pipe.

2. The high-drop vertical shaft shotcrete construction system according to claim 1, characterized in that, The buffer includes a first connector, a first buffer chamber, a second buffer chamber, and a second connector arranged sequentially from top to bottom. A first guide plate and a second guide plate are spirally arranged in the first buffer chamber and the second buffer chamber respectively, and the outlet of the first buffer chamber is connected to the inlet of the second buffer chamber.

3. The high-drop vertical shaft shotcrete construction system according to claim 2, characterized in that, The overall cross-sectional area of ​​the first and second buffer chambers decreases from the middle to both ends along the axial direction, and the inlet and outlet sections are square.

4. A high-drop vertical shaft shotcrete construction system according to claim 2, characterized in that, An observation port and a movable cover for opening and closing the observation port are provided on the upper side wall of the second buffer chamber. One side of the movable cover is hinged to the edge of the observation port, and a locking element is provided between the other side of the movable cover and the upper side wall of the second buffer chamber.

5. A high-drop vertical shaft shotcrete construction system according to claim 4, characterized in that, A flat vibrator is installed on the lower side wall of the first buffer chamber.

6. The high-drop vertical shaft shotcrete construction system according to claim 1, characterized in that, Two support anchor rods are installed on both sides of the flange at the connection of adjacent delivery pipes. One end of the support anchor rod is anchored to the well wall, and the other end extends horizontally to the bottom of the flange.

7. A high-drop vertical shaft shotcrete construction system according to claim 1, characterized in that, The concrete conveying equipment is a concrete pump truck or a concrete mixer truck, and the concrete spraying mechanism includes a concrete spraying machine and a concrete spraying robotic arm.

Images