Ultra-high performance concrete (UHPC) preparation device and method for extra-large bridge

Abstract

The invention discloses an extra-large bridge UHPC concrete preparation device and method, and relates to the technical field of maritime work cement, the extra-large bridge UHPC concrete preparation device comprises a preparation assembly, a collecting and transferring device is arranged below the preparation assembly, and a first feeding assembly used for feeding a powder material is arranged on the first side of the preparation assembly; a first feeding assembly used for feeding solid materials is arranged on the first side of the preparation assembly, a second feeding assembly used for feeding solid materials is arranged on the second side of the preparation assembly, a liquid feeding assembly used for conveying liquid is arranged on the third side of the preparation assembly, a material mixing assembly is arranged above the first feeding assembly, and a material vibrating assembly is arranged below the second feeding assembly; a third feeding assembly for feeding steel fibers is mounted above the preparation assembly; the first feeding assembly comprises a conveying unit and an anti-blocking unit, the conveying unit is mounted on one side of the preparation assembly, and the conveying unit is connected with the mixing assembly through the anti-blocking unit; the concrete preparation efficiency is improved, the steel fiber distribution uniformity is ensured, and the concrete preparation quality is improved.

Description

Technical Field

[0001] This invention relates to the field of marine cement technology, particularly to the field of ultra-high performance concrete (UHPC) preparation technology, and more specifically to a UHPC concrete preparation device and method for super-large bridges. Background Technology

[0002] With the rapid development of transportation infrastructure, the demand for the construction of mega-bridges is constantly increasing. Mega-bridges usually need to cross wide waters and deep valleys. The key components of mega-bridges face huge static and dynamic loads, severe environmental erosion, and durability issues under long-term service. Traditional ordinary concrete and high-performance concrete can no longer meet the comprehensive requirements of mega-bridges in terms of strength, toughness, and durability, as well as lightweight, high load-bearing capacity, ultra-long service life, and low maintenance costs.

[0003] Ultra-high performance concrete (UHPC) offers an ideal solution to the challenges faced by mega-bridges due to its ultra-high compressive strength, ultra-high flexural / tensile strength, excellent toughness, extremely low permeability, and outstanding durability. However, existing technologies for preparing UHPC suffer from problems such as uneven mixing of powder raw materials and low mixing efficiency, which affect the overall preparation efficiency and the quality of the prepared concrete. In existing technologies, steel fibers are often added directly, which leads to uneven addition of steel fibers and results in the concrete failing to meet requirements after molding. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a UHPC concrete preparation device for extra-large bridges, comprising a preparation component, a collection and transfer device disposed below the preparation component, a first feeding component for feeding powder materials disposed on a first side of the preparation component, a second feeding component for feeding solid materials disposed on a second side of the preparation component, a liquid delivery component for conveying liquid disposed on a third side of the preparation component, a mixing component disposed above the first feeding component, and a vibrating component disposed below the second feeding component; a third feeding component for feeding steel fibers is installed above the preparation component; the first feeding component includes a conveying unit and an anti-clogging unit, the conveying unit is installed on one side of the preparation component, and the conveying unit is connected to the mixing component through the anti-clogging unit.

[0005] Furthermore, the mixing assembly includes a mixing cylinder, a second support plate, and a second rotating shaft. The mixing cylinder is detachably mounted on the anti-clogging unit via the second support plate. Multiple injection cylinders are fixedly arranged in a circumferential shape at the upper end of the mixing cylinder. A valve for controlling material discharge is provided at the lower end of the mixing cylinder. A motor is coaxially fixedly mounted at the upper end of the mixing cylinder. The second rotating shaft is coaxially rotatably mounted inside the mixing cylinder and is coaxially fixedly connected to the output shaft of the fourth motor. The mixing cylinder is shaped like an inverted frustum, wider at the top and narrower at the bottom. A spiral guide ring, wider at the top and narrower at the bottom, is fixedly mounted on the second rotating shaft. The spiral guide ring is located inside the mixing cylinder and matches the mixing cylinder. Multiple stirring blades are fixedly mounted on the second rotating shaft. The length of the stirring blades decreases sequentially from top to bottom and matches the mixing cylinder. A spiral auger conveyor shaft is fixedly mounted at the lower end of the second rotating shaft.

[0006] Furthermore, the anti-blocking unit includes a third motor, an anti-blocking box, a first support plate, and a first rotating shaft. The anti-blocking box is fixedly installed on the conveying unit, and the first support plate is fixedly installed on the anti-blocking box. The first support plate is provided with a feeding channel. The mixing cylinder is detachably installed on the first support plate via a second support plate. The first valve is provided on the first support plate. The third motor is fixedly installed at one end of the anti-blocking box. The first rotating shaft is rotatably installed inside the anti-blocking box. The first rotating shaft is coaxially and fixedly connected to the output shaft of the third motor. Multiple spiral blades are evenly fixedly arranged on the first rotating shaft. The feeding channel of the first support plate is connected to the mixing cylinder via the first valve. The mixing cylinder is connected to the conveying unit via the first valve and the first support plate.

[0007] Furthermore, the vibrating assembly includes a support frame four, a motor five, a rotating rod, and a support shaft. The support frame four is disposed on one side of the assembly, the motor five is fixedly mounted on the support frame four, one end of the rotating rod is fixedly connected to the output shaft of the motor five, and the other end of the rotating rod is fixedly mounted with a connecting shaft. The support shaft is fixedly mounted on the support frame four, and both the support shaft and the output shaft of the motor five are disposed on the center line of the support frame four in the vertical direction, with the support shaft positioned above the output shaft of the motor five. The connecting rod two is coaxial. Rotatably mounted on the support shaft, one end of the connecting rod 2 is hinged to connecting rod 1 and connecting rod 3, and the other end of the connecting rod 2 is hinged to connecting rod 4. The end of connecting rod 1 away from connecting rod 2 is hinged to the connecting shaft. The end of connecting rod 3 away from connecting rod 2 is hinged to vibrating rod 2, and the end of connecting rod 4 away from connecting rod 2 is hinged to vibrating rod 1. The length of vibrating rod 2 is greater than the length of vibrating rod 1. Vibrating rod 1 and vibrating rod 2 are both slidably mounted on the support frame 4, and elastic balls are fixedly provided at the upper ends of vibrating rod 1 and vibrating rod 2.

[0008] Furthermore, the third feeding assembly includes a first feeding box, a vibrating plate, and springs. The first feeding box is detachably installed above the preparation assembly. The first feeding box includes three cavities: the upper cavity is a truncated cone, the middle cavity is rectangular, and the lower cavity is an inverted truncated cone. Supports are fixedly installed at the four corners of the lower end of the middle cavity. The vibrating plate is slidably installed in the middle cavity. Guide rods are fixedly installed at the four corners of the bottom surface of the vibrating plate. The supports and guide rods correspond one-to-one. The vibrating plate is slidably connected to the supports through the guide rods. A spring is provided between each support and the vibrating plate. Multiple dropping holes for steel fibers to pass through are evenly provided on the vibrating plate. Protective boxes are detachably installed on both sides of the top surface of the vibrating plate. Each protective box contains a vibrator for driving the vibrating plate to vibrate. The outer surface of the protective box is an arc-shaped inclined surface.

[0009] Furthermore, the preparation assembly includes a support frame, a mixing box, a feeding box, electric cylinders, a hopper door, a motor, and a stirring shaft. The mixing box is fixedly mounted on the support frame, the feeding box is detachably mounted above the mixing box, and the injection box is detachably mounted on the feeding box. Two electric cylinders are provided, each mounted on one side of the support frame. The hopper door is slidably mounted at the discharge port below the mixing box. There are two hopper doors, each connected to the piston rod of a corresponding electric cylinder. Two motors are fixedly mounted at intervals at one end of the mixing box. A stirring shaft is fixedly mounted on the output shaft of each motor. The stirring shaft is rotatably mounted inside the mixing box. Multiple stirring rods are spaced apart on each stirring shaft, and the deflection angles between the multiple stirring rods on the same stirring shaft are all different.

[0010] Furthermore, the second feeding assembly includes a second injection box and a third support frame. The third and fourth support frames are located on the same side of the first support frame. The second injection box is detachably mounted on the third support frame. A discharge box is inclinedly arranged between the second injection box and the feed box. Initially, the first and second vibrating rods are both located below the discharge box.

[0011] Furthermore, the liquid delivery assembly includes two injection rods, which are installed at intervals on the feed box. One injection rod is externally connected to an injection device one for injecting liquid water-reducing agent, and the other injection rod is externally connected to an injection device two for injecting water.

[0012] Furthermore, the conveying unit includes a feeding cylinder, a second support frame, a second motor, a belt drive assembly, and a first spiral auger conveyor shaft. The second support frame is located on the side of the first support frame away from the second filling box. Multiple second support frames are spaced apart. The feeding cylinder is detachably mounted on the second support frame and is connected to the mixing box. The second motor is fixedly mounted on the second support frame at the end of the feeding cylinder away from the first support frame. The first spiral auger conveyor shaft is rotatably mounted inside the feeding cylinder. The output shaft of the second motor is connected to the end of the first spiral auger conveyor shaft via the belt drive assembly. The feeding cylinder is connected to the discharge channel on the first support plate via an anti-blocking box. Each filling cylinder is detachably equipped with a first hopper cover. The first filling box is detachably equipped with a second hopper cover. The second filling box is detachably equipped with a third hopper cover.

[0013] This invention also discloses a method for preparing concrete using a UHPC concrete preparation device for extra-large bridges, comprising the following steps: S1. Solid raw materials are injected into the preparation component using the second feeding component for stirring and mixing. The solid raw materials and their proportions are: quartz sand 880-1000 kg / m³, ceramic aggregate 120-180 kg / m³. S2. The powdered raw materials are mixed using the mixing component and then conveyed to the formulation component by the conveying unit to be mixed with the solid raw materials again. The powdered raw materials and their proportions are: cement 680-750kg / m³, silica fume 120-160kg / m³, metakaolin 80-110kg / m³, mineral powder 100-140kg / m³, and nano calcium carbonate 8-12kg / m³. S3. Use the liquid delivery component to inject the liquid raw material into the preparation component for stirring and mixing. The liquid raw material and its ratio are: water 150-165 kg / m³, water-reducing agent 20-28 kg / m³. S4. After the steel fibers are fed into the preparation component using the third feeding component, they are finally stirred and mixed, wherein the steel fiber ratio is 140-170 kg / m³. S5. After mixing, the silo door is opened, and the concrete falls into the collection and transfer device below for collection and transfer to the curing and molding area for curing and molding.

[0014] The beneficial effects of this invention compared with the prior art are: (1) When mixing powder raw materials, the mixing component of this invention can use the stirring of the stirring blades to make the powder raw materials fully dispersed and fully mixed, which improves the mixing efficiency and effect. The downward vertical pressure generated by the spiral guide ring when rotating can prevent the powder material from having rat holes or bridging, so as to ensure that the material can flow out fully and quickly. At the same time, due to the rotation of the spiral auger conveyor shaft 2, it can further prevent the problem of sticking to the outlet and affecting the feeding speed; (2) This invention uses the anti-blocking unit in the first feeding component to cooperate with the mixing component, which can further disperse the mixed material, prevent the problem of sticking, and improve the feeding speed while ensuring quality; (3) The second feeding component of this invention When the component is feeding, the alternating movement of vibrating rod one and vibrating rod two can drive the elastic balls connected to each other to alternately strike the feeding box, thereby preventing the material from accumulating or sticking in the feeding box, increasing the speed at which the material in the feeding box enters the preparation component, and thus improving the overall preparation efficiency; (4) When the third feeding component of the present invention injects steel fiber, under the action of the vibration force of the vibrating plate and the uniformly arranged dropping holes on the vibrating plate, the steel fiber can enter the preparation component more evenly than the direct input in the prior art, thereby improving the uniformity of steel fiber distribution, and thus improving the quality of concrete molding. At the same time, since the outer surface of the protective box is an arc-shaped inclined surface and the protective box vibrates with the vibrating plate, it can prevent the steel fiber from remaining on the protective box when it enters. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a front view of the present invention.

[0017] Figure 3 This is a top view of the present invention.

[0018] Figure 4 This is a side view of the present invention.

[0019] Figure 5 This is a partial structural diagram of the present invention. Figure 1 .

[0020] Figure 6 This is a schematic diagram of the structure of the first feeding component and the mixing component of the present invention.

[0021] Figure 7 This is a partial structural diagram of the first feeding component and the mixing component of the present invention.

[0022] Figure 8 For the present invention Figure 7 A cross-sectional view along the AA direction.

[0023] Figure 9 This is a partial structural diagram of the mixing component of the present invention.

[0024] Figure 10 This is a partial structural diagram of the present invention. Figure 2 .

[0025] Figure 11 For the present invention Figure 10 A cross-sectional view along the BB direction.

[0026] Figure 12 For the present invention Figure 11 Enlarged structural diagram at point D.

[0027] Figure 13 This is a partial structural diagram of the present invention. Figure 3 .

[0028] Figure 14 For the present invention Figure 13 A cross-sectional view along the CC direction.

[0029] Figure 15 This is a partial structural diagram of the formulation component of the present invention.

[0030] Figure 16 This is a schematic diagram of the vibrating material assembly structure of the present invention. Figure 1 .

[0031] Figure 17 This is a schematic diagram of the vibrating material assembly structure of the present invention. Figure 2 .

[0032] Reference numerals: 101-Support frame one; 102-Battery box; 103-Feeding box; 104-Electric cylinder; 105-Hatch door; 106-Motor one; 107-Agitator shaft one; 201-Feeding cylinder; 202-Support frame two; 203-Motor two; 204-Belt drive assembly; 205-Motor three; 206-Anti-blocking box; 207-Support plate one; 208-Spiral auger conveyor shaft one; 209-Rotating shaft one; 301-Mixing cylinder; 302-Injection cylinder; 303-Motor four; 304-Support plate two; 305-Valve one; 306-Rotating shaft two; 307-Agitator blades; 308-Screw 309-Spiral auger conveyor shaft II; 401-Injection box I; 402-Vibrating plate; 403-Spring; 404-Support; 405-Guide rod; 406-Protective box; 407-Vibrator; 501-Injection box II; 502-Discharge box; 503-Support frame III; 601-Support frame IV; 602-Motor V; 603-Rotating rod; 604-Connecting shaft; 605-Connecting rod I; 606-Connecting rod II; 607-Support shaft; 608-Connecting rod III; 609-Connecting rod IV; 610-Vibrating rod I; 611-Vibrating rod II; 701-Injection rod; 702-Valve II. Detailed Implementation

[0033] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions herein are used to explain the present invention, but are not intended to limit the present invention.

[0034] Example: Figures 1-17 The UHPC concrete preparation device for a super-large bridge shown includes a preparation component, a collection and transfer device below the preparation component, a first feeding component for feeding powder materials on the first side of the preparation component, a second feeding component for feeding solid materials on the second side of the preparation component, a liquid feeding component for conveying liquids on the third side of the preparation component, a mixing component above the first feeding component, and a vibrating component below the second feeding component; a third feeding component for feeding steel fibers is installed above the preparation component; the first feeding component includes a conveying unit and an anti-blocking unit, the conveying unit is installed on one side of the preparation component, and the conveying unit is connected to the mixing component through the anti-blocking unit.

[0035] The mixing assembly includes a mixing cylinder 301, a second support plate 304, and a second rotating shaft 306. The mixing cylinder 301 is detachably mounted on the anti-clogging unit via the second support plate 304. Multiple injection cylinders 302 are fixedly arranged in a circumferential shape at the upper end of the mixing cylinder 301. A valve 305 for controlling material discharge is provided at the lower end of the mixing cylinder 301. A fourth motor 303 is coaxially fixedly mounted at the upper end of the mixing cylinder 301. The second rotating shaft 306 is coaxially rotatably mounted inside the mixing cylinder 301. The second rotating shaft 306 and the fourth motor 303 are connected. The output shaft is coaxially fixedly connected. The mixing cylinder 301 is shaped like an inverted frustum, which is larger at the top and smaller at the bottom. A spiral guide ring 308, which is larger at the top and smaller at the bottom, is fixedly installed on the rotating shaft 306. The spiral guide ring 308 is installed inside the mixing cylinder 301 and matches the mixing cylinder 301. Multiple stirring blades 307 are fixedly installed on the rotating shaft 306. The length of the multiple stirring blades 307 decreases from top to bottom and matches the mixing cylinder 301. A spiral auger conveyor shaft 309 is fixedly installed at the lower end of the rotating shaft 306.

[0036] The anti-blocking unit includes a motor 205, an anti-blocking box 206, a support plate 207, and a rotating shaft 209. The anti-blocking box 206 is fixedly installed on the conveying unit, and the support plate 207 is fixedly installed on the anti-blocking box 206. A material discharge channel is provided on the support plate 207. The mixing cylinder 301 is detachably installed on the support plate 207 via a support plate 304. A valve 305 is provided on the support plate 207. The motor 205 is fixedly installed at one end of the anti-blocking box 206. The rotating shaft 209 is rotatably installed inside the anti-blocking box 206. The rotating shaft 209 is coaxially and fixedly connected to the output shaft of the motor 205. Multiple spiral blades are evenly fixedly installed on the rotating shaft 209. The material discharge channel of the support plate 207 is connected to the mixing cylinder 301 via the valve 305. The mixing cylinder 301 is connected to the conveying unit via the valve 305 and the support plate 207.

[0037] The vibrating assembly includes a support frame 601, a motor 602, a rotating rod 603, and a support shaft 607. The support frame 601 is located on one side of the assembly. The motor 602 is fixedly mounted on the support frame 601. One end of the rotating rod 603 is fixedly connected to the output shaft of the motor 602, and the other end of the rotating rod 603 is fixedly mounted with a connecting shaft 604. The support shaft 607 is fixedly mounted on the support frame 601. Both the support shaft 607 and the output shaft of the motor 602 are located on the vertical centerline of the support frame 601, and the support shaft 607 is located above the output shaft of the motor 602. A connecting rod 606 is coaxially rotatably mounted on the support frame. On shaft 607, one end of connecting rod 2 606 is hinged to connecting rod 1 605 and connecting rod 3 608, and the other end of connecting rod 2 606 is hinged to connecting rod 4 609. The end of connecting rod 1 605 away from connecting rod 2 606 is hinged to connecting shaft 604. The end of connecting rod 3 608 away from connecting rod 2 606 is hinged to vibrating rod 2 611, and the end of connecting rod 4 609 away from connecting rod 2 606 is hinged to vibrating rod 1 610. The length of vibrating rod 2 611 is greater than the length of vibrating rod 1 610. Vibrating rod 1 610 and vibrating rod 2 611 are both slidably mounted on support frame 4 601. The upper ends of vibrating rod 1 610 and vibrating rod 2 611 are both fixedly provided with elastic balls.

[0038] The third feeding assembly includes a feeding box 401, a vibrating plate 402, and a spring 403. The feeding box 401 is detachably installed above the dispensing assembly. The feeding box 401 includes three cavities: the upper cavity is a truncated cone, the middle cavity is rectangular, and the lower cavity is an inverted truncated cone. Supports 404 are fixedly installed at the four corners of the lower end of the middle cavity. The vibrating plate 402 is slidably installed in the middle cavity. Guide rods 405 are fixedly installed at the four corners of the bottom surface of the vibrating plate 402. Corresponding one-to-one with the guide rod 405, the vibrating plate 402 is slidably connected to the support 404 through the guide rod 405. A spring 403 is provided between each support 404 and the vibrating plate 402. Multiple dropping holes for steel fibers to pass through are evenly provided on the vibrating plate 402. Protective boxes 406 are detachably installed on both sides of the top surface of the vibrating plate 402. A vibrator 407 for driving the vibrating plate 402 to vibrate is provided inside each protective box 406. The outer surface of the protective box 406 is an arc-shaped inclined surface.

[0039] The mixing assembly includes a support frame 101, a mixing box 102, a feeding box 103, an electric cylinder 104, a door 105, a motor 106, and a stirring shaft 107. The mixing box 102 is fixedly mounted on the support frame 101. The feeding box 103 is detachably mounted above the mixing box 102. The filling box 106 is detachably mounted on the feeding box 103. Two electric cylinders 104 are provided, one on each side of the support frame 101. The door 105 is slidably mounted on the mixing box 106. At the lower discharge port of 02, there are two hopper doors 105. Each hopper door 105 is connected to the piston rod of the corresponding electric cylinder 104. Two motors 106 are fixedly installed at intervals at one end of the batching box 102. A stirring shaft 107 is fixedly installed on the output shaft of each motor 106. The stirring shaft 107 is rotatably installed in the batching box 102. Multiple stirring rods are arranged at intervals on each stirring shaft 107, and the deflection angles between the multiple stirring rods on the same stirring shaft 107 are different.

[0040] The second feeding assembly includes a second feeding box 501 and a third support frame 503. The third support frame 503 and the fourth support frame 601 are located on the same side of the first support frame 101. The second feeding box 501 is detachably installed on the third support frame 503. A discharge box 502 is inclinedly arranged between the second feeding box 501 and the feeding box 103. Initially, the first vibrating rod 610 and the second vibrating rod 611 are both located below the discharge box 502.

[0041] The liquid delivery assembly includes two injection rods 701. The two injection rods 701 are installed at intervals on the feed box 103. One injection rod 701 is externally connected to an injection device 1 for injecting liquid water-reducing agent, and the other injection rod 701 is externally connected to an injection device 2 for injecting water.

[0042] The conveying unit includes a feeding cylinder 201, a second support frame 202, a second motor 203, a belt drive assembly 204, and a spiral auger conveyor shaft 208. The second support frame 202 is located on the side of the first support frame 101 away from the second filling box 501. Multiple second support frames 202 are spaced apart. The feeding cylinder 201 is detachably mounted on the second support frame 202 and is connected to the batching box 102. The second motor 203 is fixedly mounted on the end of the feeding cylinder 201 away from the first support frame 101. On the support frame 202, the spiral auger conveyor shaft 208 is rotatably installed inside the feeding cylinder 201. The output shaft of the motor 203 is connected to the end of the spiral auger conveyor shaft 208 through the belt drive assembly 204. The feeding cylinder 201 is connected to the discharge channel on the support plate 207 through the anti-blocking box 206. Each injection cylinder 302 is detachably equipped with a bin cover 1, the injection box 401 is detachably equipped with a bin cover 2, and the injection box 501 is detachably equipped with a bin cover 3.

[0043] This invention also discloses a method for preparing concrete using a UHPC concrete preparation device for extra-large bridges, comprising the following steps: S1. Solid raw materials are injected into the preparation component using the second feeding component for stirring and mixing. The solid raw materials and their proportions are: quartz sand 880-1000 kg / m³, ceramic aggregate 120-180 kg / m³. S2. The powdered raw materials are mixed using the mixing component and then conveyed to the formulation component by the conveying unit to be mixed with the solid raw materials again. The powdered raw materials and their proportions are: cement 680-750kg / m³, silica fume 120-160kg / m³, metakaolin 80-110kg / m³, mineral powder 100-140kg / m³, and nano calcium carbonate 8-12kg / m³. S3. Use the liquid delivery component to inject the liquid raw material into the preparation component for stirring and mixing. The liquid raw material and its ratio are: water 150-165 kg / m³, water-reducing agent 20-28 kg / m³. S4. After the steel fibers are fed into the preparation component using the third feeding component, they are finally stirred and mixed, wherein the steel fiber ratio is 140-170 kg / m³. S5. After mixing, the silo door 105 is opened, and the concrete falls into the collection and transfer device below for collection and transfer, and is then transferred to the curing and molding area for curing and molding.

[0044] When the mixing assembly is working: Valve 1 (305) is closed, and the first hopper cover on the injection cylinder 302 is opened. A fixed quantity of powdered raw materials is injected into the mixing cylinder 301 through the injection cylinder 302. The powdered raw materials and their proportions are: cement 680-750 kg / m³, silica fume 120-160 kg / m³, metakaolin 80-110 kg / m³, mineral powder 100-140 kg / m³, and nano-calcium carbonate 8-12 kg / m³. After the powdered raw materials are injected, the hopper cover is closed. The output shaft of motor 4 (303) drives shaft 2 (306) to rotate, which in turn drives the mixing blades 307 and the spiral... The rotation of the guide ring 308 and the spiral auger conveyor shaft 309, along with the stirring of the mixing blades 307, ensures that the powder raw materials are fully dispersed and mixed, improving the mixing efficiency and effect. The spiral guide ring 308 generates downward vertical pressure during rotation, which prevents the powder material from forming holes or bridging, ensuring that the material can flow out quickly and efficiently. At the same time, the rotation of the spiral auger conveyor shaft 309 further prevents the material from sticking to the discharge port and affecting the feeding speed. After stirring for the set time (1-2 minutes), valve 305 opens, and the material enters the anti-blocking box 206.

[0045] The belt drive assembly 204 includes a first pulley, a second pulley, and a belt. The first pulley is coaxially fixed on the output shaft of the second motor 203, and the second pulley is coaxially fixed on the end of the first spiral auger conveyor shaft 208. The first pulley and the second pulley are connected by a belt. During operation: the output shaft of the second motor 203 drives the first pulley to rotate, the first pulley drives the second pulley to rotate through the belt, and the second pulley drives the first spiral auger conveyor shaft 208 to rotate.

[0046] When the first feeding component is working: after the material enters the anti-blocking box 206, the output shaft of motor 3 205 drives the rotating shaft 1 209 to rotate. The multiple spiral blades on the rotating shaft 1 209 can further disperse the mixed material to prevent sticking. While ensuring quality, it also increases the feeding speed. The material enters the feeding cylinder 201. The output shaft of motor 2 203 drives the spiral auger conveyor shaft 1 208 to rotate through the belt drive assembly 204. When the spiral auger conveyor shaft 1 208 rotates, it transports the material to the mixing component for concrete mixing.

[0047] When the second feeding component is working: open the hopper cover 3 on the feeding box 2 501 and inject solid raw materials into the feeding box 2 501. The solid raw materials and their proportions are: quartz sand 880-1000kg / m³, ceramic aggregate 120-180kg / m³. After the solid raw materials are injected, they enter the mixing component through the discharge box 502 for concrete mixing.

[0048] When the vibrating assembly is working: As solid raw materials enter the mixing assembly from the feeding box 502, the output shaft of motor 5 602 drives the rotating rod 603 to rotate. The rotating rod 603 drives the connecting rod 1 605 to rotate eccentrically relative to the output shaft of motor 5 602 through the connecting shaft 604. The connecting rod 1 605 drives the connecting rod 2 606 to rotate. The connecting rod 2 606 drives the connecting rod 3 608 and the connecting rod 4 609 to rotate. The connecting rod 3 608 drives the vibrating rod 2 611 to reciprocate, and the connecting rod 4 609 drives the vibrating material... The vibrating rod 610 reciprocates, and simultaneously, as the vibrating rod 610 rises, the vibrating rod 611 falls, and as the vibrating rod 610 falls, the vibrating rod 611 rises, thus realizing the alternating movement of the vibrating rod 610 and the vibrating rod 611. This, in turn, drives the elastic balls connected to each to alternately strike the feeding box 502, thereby preventing material from accumulating or sticking inside the feeding box 502. At the same time, it increases the speed at which the material in the feeding box 502 enters the preparation component, thereby improving the overall preparation efficiency.

[0049] When the liquid delivery assembly is working: Liquid raw materials are injected into the preparation assembly using injection device one and injection device two. The liquid raw materials and their proportions are: water 150-165 kg / m³, water-reducing agent 20-28 kg / m³. Valves 702 on injection rod 701 are opened. Injection device one injects water-reducing agent into the preparation assembly, and injection device two injects water into the preparation assembly, thereby carrying out concrete preparation.

[0050] When the preparation component is in operation: after the raw materials are injected, the output shaft of motor 106 drives the stirring shaft 107 to rotate. The stirring shaft 107 drives multiple stirring rods to stir. At the same time, the stirring rods on the two stirring shafts 107 move alternately without interfering with each other, which improves the stirring efficiency while ensuring the quality of the mixing.

[0051] Once the concrete is prepared, the piston rod of each electric cylinder 104 pushes the connected chamber door 105 to move. After the chamber door 105 opens, the concrete falls into the collection and transfer device below for collection and transfer, and is then transferred to the curing and molding area for curing and molding.

[0052] When the third feeding component is working: the second cover on the first feeding box 401 is opened, and the vibrator 407 generates vibration force to drive the vibrating plate 402 and the guide rod 405 to vibrate back and forth on the support 404, injecting steel fibers into the first feeding box 401. The steel fiber ratio is 140-170 kg / m³. After the steel fibers are injected, under the action of the vibration force of the vibrating plate 402 and the uniformly arranged dropping holes on the vibrating plate 402, the steel fibers can enter the preparation component more evenly than the direct input in the prior art, thereby improving the uniformity of steel fiber distribution and thus improving the quality of concrete molding. Since the outer surface of the protective box 406 is an arc-shaped inclined surface and the protective box 406 vibrates with the vibrating plate 402, it can prevent the steel fibers from remaining on the protective box 406 when they enter.

[0053] In this embodiment, during the injection process, 70% water is injected first, followed by the water-reducing agent for mixing, and finally 30% water is injected again for mixing. In this embodiment, when injecting steel fibers, the steel fibers are injected in three batches, with an injection interval of 15 seconds between adjacent batches.

[0054] The working principle of this invention is as follows: Solid raw materials are injected into the preparation component using the second feeding component for mixing. Powdered raw materials are mixed using the mixing component and then conveyed to the preparation component by the conveying unit for further mixing with the solid raw materials. Water and water-reducing agent are injected into the preparation component using the liquid feeding component for mixing. Steel fibers are added to the preparation component using the third feeding component for final mixing. After mixing, the silo door 105 is opened, and the concrete falls into the collection and transfer device below for collection and transfer to the curing and molding area for curing and molding.

Claims

1. A UHPC concrete preparation device for a super-large bridge, comprising a preparation component, wherein a collection and transfer device is disposed below the preparation component, characterized in that, The first side of the preparation component is provided with a first feeding component for feeding powder materials, the second side of the preparation component is provided with a second feeding component for feeding solid materials, and the third side of the preparation component is provided with a liquid feeding component for conveying liquids. A mixing component is provided above the first feeding component, and a vibrating component is provided below the second feeding component. A third feeding component for feeding steel fibers is installed above the preparation component. The first feeding component includes a conveying unit and an anti-clogging unit. The conveying unit is installed on one side of the preparation component, and the conveying unit is connected to the mixing component through the anti-clogging unit.

2. The UHPC concrete mix design device for extra-large bridges as described in claim 1, characterized in that, The mixing assembly includes a mixing cylinder (301), a second support plate (304), and a second rotating shaft (306). The mixing cylinder (301) is detachably mounted on the anti-blocking unit via the second support plate (304). Multiple injection cylinders (302) are fixedly arranged in a circumferential shape at the upper end of the mixing cylinder (301). A valve (305) for controlling material discharge is provided at the lower end of the mixing cylinder (301). A motor (303) is coaxially fixedly mounted at the upper end of the mixing cylinder (301). The second rotating shaft (306) is coaxially rotatably mounted inside the mixing cylinder (301). The second rotating shaft (306) and the motor are connected... The output shaft of (303) is coaxially fixedly connected. The mixing cylinder (301) is shaped like an inverted frustum with a larger upper part and a smaller lower part. A spiral guide ring (308) with a larger upper part and a smaller lower part is fixedly installed on the rotating shaft (306). The spiral guide ring (308) is installed inside the mixing cylinder (301) and matches the mixing cylinder (301). Multiple stirring blades (307) are fixedly installed on the rotating shaft (306). The length of the multiple stirring blades (307) decreases from top to bottom and matches the mixing cylinder (301). A spiral auger conveying shaft (309) is fixedly installed at the lower end of the rotating shaft (306).

3. The UHPC concrete mix design device for extra-large bridges as described in claim 2, characterized in that, The anti-blocking unit includes a motor (205), an anti-blocking box (206), a support plate (207), and a rotating shaft (209). The anti-blocking box (206) is fixedly installed on the conveying unit, and the support plate (207) is fixedly installed on the anti-blocking box (206). A material discharge channel is provided on the support plate (207). The mixing cylinder (301) is detachably installed on the support plate (207) via a support plate (304). The valve (305) is located on the support plate (207). The motor... The third (205) is fixedly installed at one end of the anti-blocking box (206). The first rotating shaft (209) is rotatably installed inside the anti-blocking box (206). The first rotating shaft (209) is coaxially fixedly connected to the output shaft of the third motor (205). Multiple spiral blades are evenly fixed on the first rotating shaft (209). The feeding channel of the first support plate (207) is connected to the mixing cylinder (301) through the first valve (305). The mixing cylinder (301) is connected to the conveying unit through the first valve (305) and the first support plate (207).

4. The UHPC concrete mix design device for extra-large bridges as described in claim 3, characterized in that, The vibrating assembly includes a support frame four (601), a motor five (602), a rotating rod (603), and a support shaft (607). The support frame four (601) is located on one side of the assembly. The motor five (602) is fixedly mounted on the support frame four (601). One end of the rotating rod (603) is fixedly connected to the output shaft of the motor five (602), and the other end of the rotating rod (603) is fixedly mounted with a connecting shaft (604). The support shaft (607) is fixedly mounted on the support frame four (601). The support shaft (607) and the output shaft of the motor five (602) are both located on the center line of the support frame four (601) in the vertical direction, and the support shaft (607) is located above the output shaft of the motor five (602). The connecting rod two (606) is coaxially rotatably mounted on the support shaft (607). On 07), one end of the connecting rod 2 (606) is hinged to the connecting rod 1 (605) and the connecting rod 3 (608), and the other end of the connecting rod 2 (606) is hinged to the connecting rod 4 (609). The end of the connecting rod 1 (605) away from the connecting rod 2 (606) is hinged to the connecting shaft (604). The end of the connecting rod 3 (608) away from the connecting rod 2 (606) is hinged to the vibrating rod 2 (611). The end of the connecting rod 4 (609) away from the connecting rod 2 (606) is hinged to the vibrating rod 1 (610). The length of the vibrating rod 2 (611) is greater than the length of the vibrating rod 1 (610). The vibrating rod 1 (610) and the vibrating rod 2 (611) are both slidably mounted on the support frame 4 (601). The upper ends of the vibrating rod 1 (610) and the vibrating rod 2 (611) are both fixedly provided with elastic balls.

5. The UHPC concrete mix design device for extra-large bridges as described in claim 4, characterized in that, The third feeding assembly includes a feeding box (401), a vibrating plate (402), and a spring (403). The feeding box (401) is detachably installed above the dispensing assembly. The feeding box (401) includes three cavities: the upper cavity is a frustum conical shape, the middle cavity is rectangular, and the lower cavity is an inverted frustum conical shape. Supports (404) are fixedly installed at the four corners of the lower end of the middle cavity. The vibrating plate (402) is slidably installed in the middle cavity. Guide rods (405) are fixedly installed at the four corners of the bottom surface of the vibrating plate (402). The supports (404) and guide rods (405) are fixedly installed at the four corners of the bottom surface of the vibrating plate (402). The rods (405) correspond one-to-one. The vibrating plate (402) is slidably connected to the support (404) through the guide rod (405). A spring (403) is provided between each support (404) and the vibrating plate (402). Multiple dropping holes for steel fibers to pass through are evenly provided on the vibrating plate (402). Protective boxes (406) can be detachably installed on both sides of the top surface of the vibrating plate (402). A vibrating machine (407) for driving the vibrating plate (402) to vibrate is provided in each protective box (406). The outer surface of the protective box (406) is an arc-shaped inclined surface.

6. The UHPC concrete mix design device for extra-large bridges as described in claim 5, characterized in that, The preparation assembly includes a support frame (101), a mixing box (102), a feeding box (103), an electric cylinder (104), a hopper door (105), a motor (106), and a stirring shaft (107). The mixing box (102) is fixedly mounted on the support frame (101). The feeding box (103) is detachably mounted above the mixing box (102). The injection box (401) is detachably mounted on the feeding box (103). There are two electric cylinders (104), which are respectively mounted on both sides of the support frame (101). The hopper door (105) is slidably mounted. At the discharge port below the mixing box (102), there are two doors (105). Each door (105) is connected to the piston rod of the corresponding electric cylinder (104). Two motors (106) are fixedly installed at intervals at one end of the mixing box (102). A stirring shaft (107) is fixedly installed on the output shaft of each motor (106). The stirring shaft (107) is rotatably installed in the mixing box (102). Multiple stirring rods are arranged at intervals on each stirring shaft (107), and the deflection angles between the multiple stirring rods on the same stirring shaft (107) are all different.

7. The UHPC concrete mix design device for extra-large bridges as described in claim 6, characterized in that, The second feeding assembly includes a second feeding box (501) and a third support frame (503). The third support frame (503) and the fourth support frame (601) are located on the same side of the first support frame (101). The second feeding box (501) is detachably installed on the third support frame (503). A discharge box (502) is inclinedly arranged between the second feeding box (501) and the feed box (103). Initially, the first vibrating rod (610) and the second vibrating rod (611) are both located below the discharge box (502).

8. The UHPC concrete mix design device for extra-large bridges as described in claim 7, characterized in that, The liquid delivery assembly includes two injection rods (701). The two injection rods (701) are installed at intervals on the feed box (103). One of the injection rods (701) is externally connected to an injection device one for injecting liquid water-reducing agent, and the other injection rod (701) is externally connected to an injection device two for injecting water.

9. A UHPC concrete mix design device for extra-large bridges as described in claim 8, characterized in that, The conveying unit includes a feeding cylinder (201), a second support frame (202), a second motor (203), a belt drive assembly (204), and a spiral auger conveying shaft (208). The second support frame (202) is located on the side of the first support frame (101) away from the second filling box (501). Multiple second support frames (202) are spaced apart. The feeding cylinder (201) is detachably mounted on the second support frame (202). The feeding cylinder (201) is connected to the mixing box (102). The second motor (203) is fixedly mounted on the feeding cylinder (201) away from the first support frame (101). 1) On one end of the support frame two (202), the spiral auger conveying shaft one (208) is rotatably installed in the feeding cylinder (201). The output shaft of the motor two (203) is connected to the end of the spiral auger conveying shaft one (208) through the belt drive assembly (204). The feeding cylinder (201) is connected to the discharge channel on the support plate one (207) through the anti-blocking box (206). Each of the injection cylinders (302) is detachably provided with a bin cover one. The injection box one (401) is detachably provided with a bin cover two. The injection box two (501) is detachably provided with a bin cover three.

10. A method for preparing concrete using the UHPC concrete mixing device for extra-large bridges as described in claim 9, characterized in that, Includes the following steps: S1. Solid raw materials are injected into the preparation component using the second feeding component for stirring and mixing. The solid raw materials and their proportions are: quartz sand 880-1000 kg / m³, ceramic aggregate 120-180 kg / m³. S2. The powdered raw materials are mixed using the mixing component and then conveyed to the formulation component by the conveying unit to be mixed with the solid raw materials again. The powdered raw materials and their proportions are: cement 680-750kg / m³, silica fume 120-160kg / m³, metakaolin 80-110kg / m³, mineral powder 100-140kg / m³, and nano calcium carbonate 8-12kg / m³. S3. Use the liquid delivery component to inject the liquid raw material into the preparation component for stirring and mixing. The liquid raw material and its ratio are: water 150-165 kg / m³, water-reducing agent 20-28 kg / m³. S4. After the steel fibers are fed into the preparation component using the third feeding component, they are finally stirred and mixed, wherein the steel fiber ratio is 140-170 kg / m³. S5. After mixing, the silo door (105) is opened, and the concrete falls into the collection and transfer device below for collection and transfer, and is transferred to the curing and molding area for curing and molding.

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