Prestressed concrete bridge cyclic grouting equipment

Abstract

This invention discloses a circulating grouting device for prestressed concrete bridges, comprising a frame on which a feeding cylinder, a mixing cylinder, a storage cylinder, and a grouting pump are sequentially and interconnected. A control cabinet is also installed on one side of the frame. A feed inlet is located at the upper part of the mixing cylinder, which contains a motor-driven agitator, a baffle plate, and a lifting mechanism. This invention uses a baffle plate and a lifting mechanism within the mixing cylinder. The control cabinet activates the lifting mechanism, causing the baffle plate to move up and down within the mixing cylinder. This changes the actual volume of the mixing cylinder as needed, shortening the distance air bubbles need to rise to the liquid surface, helping them to aggregate and float to the surface. This reduces the amount of air bubbles in the grout, thereby improving grouting defects caused by air bubbles during the grout solidification stage in the prestressed duct and ultimately improving grouting quality.

Description

Technical Field

[0001] This invention belongs to the technical field of grouting equipment, specifically relating to a circulating grouting equipment for prestressed concrete bridges. Background Technology

[0002] The circulating grouting equipment continuously circulates the grout within a loop consisting of prestressed pipes, a grouting machine, and a grouting pump to purge air from the pipes, promptly detect blockages, and flush out impurities by increasing pressure, thus eliminating factors that could lead to incomplete grouting. Precision sensors are installed at the grout inlet and outlet of the pipes to monitor the pressure in real time, providing feedback to the main system for analysis and judgment. The monitoring and control system adjusts the pressure according to the main system's instructions, ensuring that the prestressed pipes complete the grouting process under the constraints of important indicators such as grout quality, pressure magnitude, and pressure stabilization time required by the construction technical specifications, ensuring full and dense grouting. The main system determines pipe fullness by whether the pressure difference between the inlet and outlet remains constant within a certain period.

[0003] In actual grouting, air enters the cement grout during preparation in the high-speed mixing tank, forming numerous small-diameter suspended air bubbles under the high-speed rotation of the mixing blades. While the grout is stored in the storage tank, these suspended air bubbles gradually coalesce into larger bubbles. When the bubble volume increases to the point where the bubble's forces and surface tension are balanced, the bubble approaches its critical point of rupture. If the critical point is exceeded, the bubble ruptures; otherwise, it remains suspended in the grout. Because the viscosity of the grout gradually increases over time, the time it takes for the bubbles to aggregate and rise to the surface is relatively long, while the grout is stored in the storage tank for a short period. Therefore, a large number of suspended air bubbles remain in the grout. These bubbles cannot escape as the grout is forced into the channels. During the grout solidification process, a large number of bubbles gradually rise, forming localized voids. This results in the grout failing to fill the channels after solidification, leading to grouting quality defects. Summary of the Invention

[0004] The purpose of this invention is to provide a circulating grouting device for prestressed concrete bridges, which solves the problem that due to the presence of air bubbles and pores in the grout, a large number of air bubbles in the grout gradually rise to the surface during the grout solidification stage, forming local pores, resulting in the grout failing to fill the pores after solidification and causing grouting quality defects.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A circulating grouting device for prestressed concrete bridges includes a frame on which a feeding cylinder, a mixing cylinder, a storage cylinder, and a grouting pump are sequentially and interconnected. A control cabinet is also installed on one side of the frame. A feed inlet is provided at the upper part of the mixing cylinder. A motor-driven agitator is installed inside the mixing cylinder. A baffle is installed inside the mixing cylinder. A lifting mechanism is installed inside the mixing cylinder to push the baffle to move up and down inside the mixing cylinder.

[0007] Preferably, the motor is fixedly installed on the top of the stirring drum, the stirrer includes a drive shaft, the bottom of the motor is connected to the drive shaft, the bottom of the drive shaft is provided with a column groove, and vertical slots are provided on both sides of the column groove;

[0008] A secondary shaft is inserted into the column groove, and a spring is provided between the top wall of the column groove at the top of the secondary shaft. A locking block is fixedly provided on both sides of the secondary shaft, and the locking block is slidably connected to the locking groove. A screw cap is sleeved on the secondary shaft below the locking block, and the screw cap is threaded to the bottom outer ring of the drive shaft. A stirring blade is placed on the lower outer side of the secondary shaft.

[0009] Preferably, the partition plate has a concave cross-section with the middle section lower than the outer section. The outer wall of the partition plate is slidably sealed to the inner wall of the mixing drum. The middle section of the partition plate has a perforation structure. The lifting mechanism includes lifting rods. Multiple lifting rods are connected to the bottom of the outer side of the partition plate. The bottom of the lifting rods is fixedly installed on the bottom wall of the mixing drum. A conveying pipe is installed at the bottom of the partition plate. The conveying pipe transports the slurry leaking from the partition plate to the storage cylinder.

[0010] Preferably, a switch post is provided in the vent hole of the partition, and multiple vent grooves are equally spaced on the outer side wall of the switch post. The vent grooves extend from the top of the switch post to the middle. The switch post is directly opposite the bottom end of the sub-shaft. The sub-shaft can push the switch post to move downward in the vent hole, so that the vent groove of the switch post connects the upper and lower spaces of the partition. The bottom of the switch post passes through the vent hole and is rotatably connected to a cover. A return spring is connected between the cover and the bottom wall of the partition.

[0011] Preferably, the bottom end of the secondary shaft is provided with a straight or cross-shaped protrusion, and the top of the switch post is provided with a groove corresponding to the shape of the protrusion, so that the secondary shaft can drive the switch post to rotate within the leakage hole.

[0012] Preferably, a vibration motor is installed on the side wall of the stirring tank.

[0013] Technical effects and advantages of the present invention: The circulating grouting equipment for prestressed concrete bridges proposed in this invention has the following advantages compared with the prior art:

[0014] 1. This invention starts the agitator inside the mixing drum under the control of the control cabinet. The motor drives the drive shaft to rotate. Because the slot inside the drive shaft cooperates with the block on the secondary shaft, the drive shaft drives the secondary shaft at the bottom to rotate. The rotation of the secondary shaft drives the agitator blades to rotate, thereby uniformly mixing the raw materials and water to obtain the slurry. Since the partition can rise and fall to change the internal volume of the mixing drum, the drive shaft and the secondary shaft are set with a telescopic structure in this invention. With the rise and fall of the partition, the height of the agitator blades on the secondary shaft can be adjusted, so that the agitator can adapt to the mixing drum after the volume changes in real time, achieving better mixing effect.

[0015] 2. This invention sets the partition plate with a structure that is low in the middle and high on the outer ring. This allows the slurry at the top to automatically concentrate in the middle of the partition plate due to the drop created on the partition plate, and then flow out through the drain hole into the conveying pipe. At the same time, the drain hole structure is located in the middle, which can prevent the slurry from entering the electric lifting rod located at the bottom edge of the partition plate, thus preventing the electric lifting rod from being affected and unable to work. The electric lifting rod can be precisely moved by the control cabinet to move the connected partition plate, thereby changing the internal volume of the mixing drum. This shortens the distance that air bubbles have to rise to the liquid surface, helps air bubbles in the slurry to gather and float out, thereby reducing the amount of air bubbles mixed in the slurry. This improves the grouting defects caused by air bubbles in the slurry during the slurry solidification stage in the prestressed pipe, thereby improving the grouting quality.

[0016] 3. This invention utilizes the upward movement of the baffle plate to reduce the volume inside the mixing drum, shortening the distance that air bubbles in the slurry need to rise to the liquid surface, thereby reducing the amount of air bubbles in the slurry. On the other hand, in conjunction with the driving action of the baffle plate on the switch column, the trough on the switch column is opened, thereby squeezing out air bubbles when the slurry is discharged, further reducing the amount of air bubbles in the slurry. The two measures work together to reduce the amount of air bubbles in the slurry to a minimum, thereby improving the grouting defects caused by air bubbles in the slurry during the slurry solidification stage in the prestressed pipe, and achieving the goal of improving the grouting quality. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the internal structure of the mixing drum.

[0019] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0020] Figure 4 for Figure 2 A magnified view of a portion of point B in the middle. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides, for example Figure 1-4 The image shows a circulating grouting device for prestressed concrete bridges.

[0023] The device includes a frame 1, on which a feeding cylinder 2, a mixing cylinder 3, a storage cylinder 4, and a grouting pump 5 are sequentially and interconnected. A control cabinet 6 is also installed on one side of the frame 1. A feed inlet is provided at the upper part of the mixing cylinder 3. An agitator 7 driven by a motor 9 is installed inside the mixing cylinder 3. A partition 8 is installed inside the mixing cylinder 3. A lifting mechanism is installed inside the mixing cylinder 3 to push the partition 8 up and down inside the mixing cylinder 3. In use, the raw materials are fed into the inlet through the feeding cylinder 2. Then, the raw materials and water in the mixing drum 3 are mixed in proportion and stirred at a speed of not less than 1000 rpm. The mixed slurry enters the storage cylinder 4 and is then injected into the prestressed pipe through the grouting pump 5. In order to alleviate the problem that the increased viscosity of the slurry due to the increased mixing time makes it difficult for air bubbles in the slurry to gather and float to the liquid surface, this invention sets up a baffle 8 and a lifting mechanism in the mixing drum 3. The lifting mechanism is started by the control cabinet 6, which pushes the baffle 8 to rise and fall in the mixing drum 3. The actual volume in the mixing drum 3 is changed according to the needs, which shortens the distance for air bubbles to float to the liquid surface, helps air bubbles in the slurry to gather and float, thereby reducing the amount of air bubbles mixed in the slurry. This improves the grouting defects caused by air bubbles in the slurry during the slurry solidification stage in the prestressed pipe, and achieves the purpose of improving the grouting quality.

[0024] Furthermore, the motor 9 is fixedly installed on the top of the stirring drum 3, the stirrer 7 includes a drive shaft 71, the bottom of the motor 9 is connected to the drive shaft 71, the bottom of the drive shaft 71 is provided with a column groove 72, and the two sides of the column groove 72 are provided with vertical slots 73.

[0025] A secondary shaft 74 is inserted into the groove 72, and a spring is provided between the top wall of the groove 72 and the top of the secondary shaft 74. A locking block 75 is fixedly provided on both sides of the secondary shaft 74. The locking block 75 is slidably connected to the groove 73. A screw cap 76 is sleeved on the secondary shaft 74 below the locking block 75. The screw cap 76 is threaded to the bottom outer ring of the drive shaft 71. A stirring blade 77 is arranged on the lower outer side of the secondary shaft 74. In use, the agitator 7 inside the mixing drum 3 is started under the control of the control cabinet 6. The motor 9 drives the drive shaft 71 to rotate. Since the slot 73 inside the drive shaft 71 cooperates with the block 75 on the secondary shaft 74, the drive shaft 71 will drive the secondary shaft 74 at the bottom to rotate. The rotation of the secondary shaft 74 drives the agitator blade 77 to rotate, thereby uniformly mixing the raw materials and water to obtain the slurry for pressing. Since the partition 8 will rise and fall to change the internal volume of the mixing drum 3, the drive shaft 71 and the secondary shaft 74 are set as a telescopic structure in this invention. With the rise and fall of the partition 8, the height of the agitator blade 77 on the secondary shaft 74 can be adjusted, so that the agitator 7 can adapt to the mixing drum 3 after the volume is changed in real time, achieving better mixing effect.

[0026] Specifically, when the partition 8 rises, it will contact the bottom end of the secondary shaft 74, thereby forcing the secondary shaft 74 to move upward while rotating. The top of the secondary shaft 74 compresses the spring, and the secondary shaft 74 locking block 75 moves upward along the locking groove 73. At this time, the stirring blade 77 on the secondary shaft 74 moves upward along with the secondary shaft 74 as a whole. If the partition 8 moves downward, the secondary shaft 74 and the stirring blade 77 move downward in the column groove 72 in the drive shaft 71 to achieve the purpose of adapting to the height of the partition 8.

[0027] Furthermore, the partition plate 8 has a concave structure with the middle section lower than the outer section. The outer wall of the partition plate 8 is slidably sealed to the inner wall of the mixing drum 3. The middle section of the partition plate 8 is provided with a leakage hole 81 structure. The lifting mechanism includes lifting rods 82. Multiple lifting rods 82 are connected to the bottom of the outer side of the partition plate 8. The bottom of the lifting rods 82 is fixedly installed on the bottom wall of the mixing drum 3. A conveying pipe is installed at the bottom of the partition plate 8. The conveying pipe transports the slurry leaking from the partition plate 8 to the storage drum 4. In use, the baffle 8 is designed with a lower center and a higher outer ring. This allows the slurry at the top to automatically concentrate in the middle of the baffle 8 due to the drop created on the baffle 8, and then flow out through the drain hole 81 into the conveying pipe. At the same time, the drain hole 81 is located in the middle, which can prevent the slurry from entering the electric lifting rod 82 located at the bottom edge of the baffle 8, thus preventing the electric lifting rod 82 from being affected and unable to work. The electric lifting rod 82, under the control of the control cabinet 6, can precisely push the connected baffle 8 to move, thereby changing the internal volume of the mixing drum 3. This shortens the distance that air bubbles need to rise to the liquid surface, helps air bubbles in the slurry to gather and float out, thereby reducing the amount of air bubbles mixed in the slurry. This improves the grouting defects caused by air bubbles in the slurry during the slurry solidification stage in the prestressed pipe, and thus improves the grouting quality.

[0028] Furthermore, a switch post 83 is provided in the drain hole 81 of the partition 8. Multiple drain grooves 84 are equally spaced on the outer side wall of the switch post 83. The drain grooves 84 extend from the top of the switch post 83 to the middle. The switch post 83 is directly opposite the bottom end of the secondary shaft 74. The secondary shaft 74 can push the switch post 83 to move downward in the drain hole 81, so that the drain grooves 84 of the switch post 83 connect the upper and lower spaces of the partition 8. The bottom of the switch post 83 passes through the drain hole 81 and is rotatably connected to a cover 85. A return spring 86 is connected between the cover 85 and the bottom wall of the partition 8. To further reduce air bubbles in the output slurry, a switch column 83 is installed in this invention. The lifting and lowering action of the switch column 83 controls the opening and closing of the leakage hole 81 in the middle of the partition 8. Specifically, in the initial state, due to the action of the return spring 86, the bottom of the switch column 83 is pulled tight and fits against the bottom of the partition 8, thus closing the leakage hole 81 on the partition 8. At this time, the slurry above the partition 8 can be mixed under the action of the agitator 7. During the mixing process, the control cabinet 6 controls the lifting mechanism to push the partition 8 up. The lifting column on the partition 8 will contact the bottom end of the secondary shaft 74. Since the secondary shaft 74 has a space for movement within the column groove 72, the return spring 86 continues to function, and the switch column 83 remains closed. If the slurry in the mixing drum 3 is not discharged through the leak hole 81, and the control cabinet 6 controls the partition plate 8 to move to the top, the secondary shaft 74 moves into place in the column groove 72. Thus, the secondary shaft 74 and the drive shaft 71 form a whole, thereby overcoming the elastic force of the reset spring 86 at the bottom of the switch column 83. As a result, the switch column 83 is pushed down by the secondary shaft 74, and the slurry 84 opened on the outer wall of the switch column 83 extends out of the leak hole 81. Thus, the channel formed by the slurry 84 and the inner wall of the leak hole 81 is in a conductive state, and the slurry on the partition plate 8 can flow out from the conductive slurry 84. Since the diameter of the slurry 84 is much smaller than that of the slurry 85, it plays a role in pressurization. While the slurry is being squeezed out, the air bubbles are burst, which further reduces the amount of air bubbles in the slurry.

[0029] This invention utilizes the upward movement of the baffle 8 to reduce the volume inside the mixing drum 3, shortening the distance that air bubbles in the slurry need to rise to the liquid surface, thereby reducing the amount of air bubbles in the slurry. On the other hand, in conjunction with the driving action of the baffle 8 on the switch column 83, the trough 84 on the switch column 83 is opened, thereby squeezing out air bubbles when the slurry is discharged, further reducing the amount of air bubbles in the slurry. The two measures work together to reduce the amount of air bubbles in the slurry to a minimum, thereby improving the grouting defects caused by air bubbles in the slurry during the slurry solidification stage in the prestressed pipe, and achieving the goal of improving the grouting quality.

[0030] Furthermore, the bottom end of the secondary shaft 74 is provided with a straight or cross-shaped protrusion 87, and the top of the switch column 83 is provided with a groove corresponding to the shape of the protrusion 87, so that the secondary shaft 74 can drive the switch column 83 to rotate within the leakage hole 81. When the slurry is discharged, the present invention utilizes the rotation of the agitator 7 to drive the switch column 83 to rotate within the leakage hole 81, so that the leakage groove 84 channel formed on the outside of the switch column 83 is also on the rotating turntable, thereby creating a cutting effect on the air bubbles in the slurry, further reducing the amount of air bubbles in the slurry, improving grouting defects caused by air bubbles in the slurry during the slurry solidification stage in the prestressed pipe, and achieving the purpose of improving grouting quality.

[0031] Furthermore, a vibration motor 10 is installed on the side wall of the mixing drum 3. The slurry is in a vibrating state during the mixing process, which is conducive to the rise of air bubbles in the slurry, thereby further reducing the amount of air bubbles in the slurry.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility 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. Therefore, they should not be construed as limiting the invention.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A circulating grouting device for prestressed concrete bridges, comprising a frame (1), wherein a feeding cylinder (2), a mixing cylinder (3), a storage cylinder (4), and a grouting pump (5) are sequentially mounted on the frame (1), and a control cabinet (6) is also mounted on one side of the frame (1), characterized in that: The upper part of the mixing drum (3) is provided with a feed inlet. The mixing drum (3) is equipped with a stirrer (7) driven by a motor (9). The mixing drum (3) is equipped with a partition (8). The mixing drum (3) is equipped with a lifting mechanism. The lifting mechanism is used to push the partition (8) to move up and down inside the mixing drum (3). The motor (9) is fixedly installed on the top of the stirring drum (3). The stirrer (7) includes a drive shaft (71). The bottom of the motor (9) is connected to the drive shaft (71) in a transmission. The bottom of the drive shaft (71) is provided with a column groove (72). The two sides of the column groove (72) are provided with vertical slots (73). A secondary shaft (74) is inserted into the column groove (72), and a spring is provided between the top wall of the column groove (72) at the top of the secondary shaft (74). A locking block (75) is fixedly provided on both sides of the secondary shaft (74), and the locking block (75) is slidably connected to the locking groove (73). A screw cap (76) is sleeved below the locking block (75) of the secondary shaft (74), and the screw cap (76) is threaded to the bottom outer ring of the drive shaft (71). A stirring blade (77) is arranged on the lower outer side of the secondary shaft (74). The partition (8) has a concave structure with the middle part lower than the outer part. The outer wall of the partition (8) is slidably sealed to the inner wall of the mixing drum (3). The middle part of the partition (8) is provided with a leakage hole (81). The lifting mechanism includes a lifting rod (82). Multiple lifting rods (82) are connected to the bottom of the outer side of the partition (8). The bottom of the lifting rod (82) is fixedly installed on the bottom wall of the mixing drum (3). A conveying pipe is installed at the bottom of the partition (8). The conveying pipe transports the slurry leaking from the partition (8) to the storage cylinder (4). A switch post (83) is provided in the drain hole (81) of the partition (8). Multiple drain grooves (84) are equally spaced on the outer side wall of the switch post (83). The drain grooves (84) extend from the top of the switch post (83) to the middle. The switch post (83) is directly opposite the bottom end of the secondary shaft (74). The secondary shaft (74) can push the switch post (83) to move down in the drain hole (81), so that the drain grooves (84) of the switch post (83) connect the upper and lower spaces of the partition (8). The bottom of the switch post (83) passes through the drain hole (81) and is rotatably connected to a cover (85). A return spring (86) is connected between the cover (85) and the bottom wall of the partition (8).

2. The circulating grouting equipment for prestressed concrete bridges according to claim 1, characterized in that: The bottom end of the sub-shaft (74) is provided with a straight or cross-shaped protrusion (87), and the top of the switch post (83) is provided with a groove corresponding to the shape of the protrusion (87), so that the sub-shaft (74) can drive the switch post (83) to rotate in the hole (81).

3. The circulating grouting equipment for prestressed concrete bridges according to claim 2, characterized in that: A vibration motor (10) is installed on the side wall of the stirring drum (3).

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