Continuous pouring method for prefabricated box girder

Abstract

The invention relates to the technical field of building construction, in particular to a continuous casting method of a prefabricated box girder, which comprises the following steps: casting area division: dividing the prefabricated box girder into two sides by taking a longitudinal center line of a girder body as a beam body, and arranging n casting areas on each side; pouring the chamfering area positions on the two sides of the bottom plate and the middle area position of the bottom plate; pouring grids at one ends of the two sides of the prefabricated box girder to grids at the other ends of the two sides of the prefabricated box girder in a synchronous and symmetrical layer-by-layer manner by using two movable material distributors; a web area position is poured, specifically, synchronous and symmetrical pouring is conducted from a pouring grid at one end of the two sides of the prefabricated box girder formwork to a pouring grid at the other end of the two sides of the prefabricated box girder formwork in a horizontally-layered and obliquely-segmented pouring mode; pouring flange plate area positions on the two sides: pouring the flange plates on the two sides in sequence; and pouring the middle area of the top plate. By the adoption of the method, the requirement for rapid and continuous pouring adjustment of the precast beam in a segmented and horizontally layered mode can be well met, operation continuity is guaranteed, and the method helps to improve the pouring quality of the precast beam.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precast box girder, and particularly relates to a continuous pouring method of precast box girder. BACKGROUND

[0002] The precast girder concrete pouring is a work-intensive construction, which includes the feeding of the mixing station, the feeding of the concrete to the pouring area, the measurement and control of the concrete temperature and the formwork temperature, the concrete distribution, the concrete vibration, the beam surface slurry lifting and leveling, and the like operation processes, and the precast girder concrete pouring construction has strict requirements on the continuity and integrity, and once the pouring is started, the continuous pouring and one-time forming are required, and the manual and mechanical combination is usually used due to the high construction operation intensity.

[0003] The traditional precast girder construction usually adopts the construction method of fixed platform, and the feeding of the concrete to the pouring area is usually achieved by the concrete tank truck feeding, and due to the reasons of many platforms and wide distribution area, the concrete tank truck feeding has a long feeding distance and needs to frequently walk in the production area, and if the management is not good, the concrete feeding may not be timely, and the continuous pouring of the precast box girder is affected.

[0004] In addition, after the concrete is fed to the pouring area, the distribution is required to be achieved by the distribution machine, and the traditional distribution machine is usually a fixed-point distribution machine, and according to the different construction platforms, the gantry crane needs to be continuously hoisted, positioned, installed and disassembled, and the construction operation is frequent. The common precast girder distribution machine usually has the following several forms: (1) fixed-point cantilever pump pipe pouring, and this process requires the pouring arm of the distribution machine to be long to meet the coverage of the whole pouring area, but the long pouring arm is difficult to achieve the quick response and accuracy of the distribution point positioning and the automatic control pouring; (2) concrete hopper distribution pouring, and this process usually adopts the gantry crane to hoist the hopper or the movable trolley to carry the hopper, and the hopper is controlled by the gantry crane or the trolley to realize the coverage of the pouring area, and this pouring mode has the problems of complex running track, poor pouring continuity and the like, and seriously affects the pouring quality of the precast girder. SUMMARY

[0005] In order to solve the problems in the background art, the present application provides a continuous pouring method of precast box girder.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the present application is as follows: A continuous pouring method of precast box girder, comprising the following steps: S1. Pouring area division: the cross section of the prefabricated box girder formwork is divided into 2n pouring areas, the center line of the beam width is divided into two sides, each side is provided with n pouring areas, and the length of each pouring area is 8.0-10.0m; Each pouring area is further divided into a plurality of pouring grids, the length of each pouring grid is 1 / 2 of the length of the pouring area, and the height is determined according to the vertical area position of the prefabricated box girder formwork, the vertical area position includes the chamfer region position on both sides of the bottom plate, the middle region position of the bottom plate, the web region position, the flange plate region position on both sides, and the middle region position of the top plate, wherein: The pouring grid height of the chamfer region position on both sides is 36-40cm; the pouring grid height of the bottom layer of the middle region position of the bottom plate is 26-30cm, and if the pouring grid height of the bottom layer of the middle region position of the bottom plate is exceeded, the remaining height is the pouring grid height of the second layer of the middle region position of the bottom plate; the pouring grid height of the web region position, except for the top layer, is divided into layers with an average height of 28-30cm, and the height of the top layer is controlled to be 28-30cm; the pouring grid height of the flange plate region position on both sides is equal to the height of the flange plate region position on both sides; and the pouring grid height of the middle region position of the top plate is equal to the height of the middle region position of the top plate; Meanwhile, the forward pouring area and the reverse pouring area are determined, the reverse pouring area is the pouring grid at the last end of each layer, and the forward pouring area is the other pouring grids;

[0007] S2. Pouring of the chamfer region position on both sides of the bottom plate: synchronous and symmetrical layer-by-layer pouring from one end pouring grid to the other end pouring grid on both sides of the prefabricated box girder formwork, one movable distributor and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outer side of each pouring area, and in each pouring area, the length of the movable distributor is adjusted to uniformly discharge from the front end to the rear end in the forward pouring area and to uniformly discharge from the rear end to the front end in the reverse pouring area; S3. Pouring of the middle region position of the bottom plate: synchronous and symmetrical layer-by-layer pouring from one end to the other end on both sides of the prefabricated box girder formwork, one movable distributor and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outer side of each pouring area, and in each pouring area, the length of the movable distributor is adjusted to make the discharge port of the movable distributor extend to the inner form distribution skylight for discharging; S4. Pouring of the web plate region position: respectively pouring the grid from one end of the precast box girder formwork to the other end of the grid using horizontal layering, oblique sectioning pouring method for synchronous symmetrical pouring, the precast box girder formwork is provided with one movable distributor and one belt conveyor combination device on each side, n distributor positioning points are arranged on each side, corresponding to the outside of each pouring area, in each pouring area, the cantilever length of the movable distributor is adjusted, uniform feeding from the front end to the rear end in the forward pouring area, uniform feeding from the rear end to the front end in the reverse pouring area; after each horizontal layering pouring is completed, except for the pouring grid that has reached the top layer of the web plate region, the other preceding pouring grid is one layer higher than the adjacent following pouring grid, the pouring time of the two layers cannot exceed the initial setting time of the concrete; S5. Pouring of the flange plate region position on both sides: the precast box girder formwork is provided with one movable distributor and one belt conveyor combination device on each side, the combination device on one side is started to pour from one end of the grid to the other end of the grid, n distributor positioning points are arranged on each side, corresponding to the outside of each pouring area, in each pouring area, the cantilever length of the movable distributor is adjusted, uniform feeding from the front end to the rear end in the forward pouring area, uniform feeding from the rear end to the front end in the reverse pouring area; after the pouring on one side is completed, the pouring on the other side is repeated according to the above steps; S6. Pouring of the top plate middle region position: one movable distributor and one belt conveyor combination device are arranged on one side of the precast box girder formwork, the combination device pours from one end of the grid to the other end of the grid, n distributor positioning points are arranged on one side, corresponding to the outside of each pouring area, in each pouring area, the cantilever length of the movable distributor is adjusted, the movable distributor is aligned with the center line of the beam width, uniform feeding from the front end to the rear end in the forward pouring area, uniform feeding from the rear end to the front end in the reverse pouring area.

[0008] Preferably, the movable distributor is matched with a belt conveyor with adjustable conveying length for feeding, and is controlled by the concrete automatic pouring control system; The concrete automatic pouring control system controls include: a central processing unit; a measurement control module connected with the central processing unit; a measurement module connected with the measurement control module, including a concrete temperature measurement module and a formwork temperature measurement module, the concrete temperature measurement module includes a first temperature sensor for measuring the temperature of the concrete initially entering the belt conveyor, and the formwork temperature measurement module includes a second temperature sensor for measuring the temperature of the concrete flowing out of the discharge end of the movable distributor; a data collection module connected with the measuring module and the central processor, for collecting data measured by the measuring module and feeding back to the central processor; an execution control module connected with the central processor; a concrete feeding control module connected with the execution control module and the continuous belt conveyor, for controlling the belt conveyor to feed; a concrete pouring control module connected with the execution control module and the mobile distributor, for controlling the mobile distributor to open / close and adjust the speed of pouring; a vibrating control module connected with the execution control module and the attached vibrator arranged on the box girder formwork, for controlling the attached vibrator to open / close and adjust the frequency.

[0009] Preferably, the belt conveyor comprises: a fixed section of the frame, comprising a fixed section support frame, a fixed section traveling mechanism and a fixed section belt conveying mechanism, the fixed section support frame is internally provided with a traveling channel along the conveying direction of the fixed section belt conveying mechanism, two rows of adjusting units are symmetrically and fixedly arranged on the inner side of the traveling channel, the fixed section traveling mechanism is connected to the bottom of the fixed section support frame, and the fixed section belt conveying mechanism is arranged on the top of the fixed section support frame; a movable section of the frame, which is slidably arranged in the traveling channel, comprising a movable section longitudinal beam, a movable section support column, a movable section traveling mechanism and a movable section belt conveying mechanism, the movable section longitudinal beam is symmetrically provided with two longitudinal beams, which are arranged above the two rows of adjusting units along the conveying direction of the fixed section belt conveying mechanism and can match the movable section belt conveying mechanism, the movable section support column is connected to the lower front end of the movable section longitudinal beam, the movable section belt conveying mechanism can slide forward and backward relative to the adjusting units, the movable section traveling mechanism is connected to the bottom of the movable section support column, and the movable section belt conveying mechanism is arranged below the fixed section belt conveying mechanism.

[0010] Preferably, the fixed section support frame comprises a fixed section top longitudinal beam, a fixed section limiting longitudinal beam, a fixed section bottom longitudinal beam and a fixed section support column, the fixed section top longitudinal beam, the fixed section limiting longitudinal beam and the fixed section bottom longitudinal beam are symmetrically provided with two longitudinal beams, the fixed section top longitudinal beam, the fixed section limiting longitudinal beam and the fixed section bottom longitudinal beam on the same side are connected through the fixed section support column arranged at intervals, the fixed section limiting longitudinal beam is internally connected with a limiting roller, the limiting roller is located between the fixed section belt conveying mechanism and the movable section belt conveying mechanism and can match the height position of the movable section belt conveying mechanism.

[0011] Preferably, the adjusting unit comprises a plurality of rollers and roller shafts arranged in matching with the rollers, one end of the roller shaft is fixedly connected with the inner side of the fixed section support frame body, the other end is rotatably connected with the rollers, the plurality of rollers are arranged in a horizontal straight line, the rollers are provided with grooves on the circumferential side, which can be matched and inserted into the movable section longitudinal beam.

[0012] Preferably, the front end of the rack fixed section is provided with a telescopic driving mechanism, the telescopic driving mechanism is located behind the movable section support column, and can drive at least one group of rollers to rotate to drive the movable section longitudinal beam to slide.

[0013] Preferably, the telescopic driving mechanism comprises a telescopic driving mechanism platform, a telescopic driving motor, a telescopic driving first speed reducer, a telescopic driving second speed reducer, a roller rotating shaft and a rotating shaft support column, the telescopic driving mechanism platform is fixed at the front end of the rack fixed section, the telescopic driving motor and the rotating shaft support column are fixed on the telescopic driving mechanism platform, the rotating shaft support column is arranged on both sides of the telescopic driving motor, the motor shaft of the telescopic driving motor is connected with the telescopic driving first speed reducer, the telescopic driving second speed reducer is sleeved on the outer circumference of the roller rotating shaft, and both ends of the roller rotating shaft pass through the rotating shaft support column and are connected with one group of rollers, and the telescopic driving second speed reducer is engaged with the telescopic driving first speed reducer. The remaining rollers are rotatably connected with one end of a roller support shaft, and the other end of the roller support shaft is connected with the fixed section support frame body.

[0014] Preferably, a limit sensor is arranged at the position close to the movable section support column of the movable section longitudinal beam, and the limit sensor is located behind the movable section support column.

[0015] Preferably, a concrete hopper is arranged above the feeding end of the fixed section belt conveying mechanism.

[0016] Preferably, the mobile distributing machine comprises: a distributing machine rack; a distributing machine walking mechanism fixed at the bottom of the distributing machine rack; a collecting tank arranged in the distributing machine rack and internally provided with a concrete pump; a first concrete conveying pipe, the lower end of which is connected with the outlet of the concrete pump, and the upper end of which extends to the top of the distributing machine rack; a first rotating mechanism fixed at the top of the distributing machine rack; a first flange connecting mechanism fixedly connected at the top of the first rotating mechanism, driven to rotate by the first rotating mechanism, and provided with a through hole in the middle, which accommodates the upper end of the first concrete conveying pipe; a second concrete delivery pipe in inverted U shape, one end of which extends into the through hole of the first flange connecting mechanism and is in sealed communication with the upper end of the first concrete delivery pipe and can rotate relative to the first concrete delivery pipe; a first rotating arm, one end of which is fixedly connected with one side of the first flange connecting mechanism and the top of which supports the second concrete delivery pipe; a second flange connecting mechanism, one side of which is fixedly connected with the other end of the first rotating arm; a second rotating mechanism, the top of which is fixedly connected with the bottom of the second flange connecting mechanism; a third flange connecting mechanism, which is connected with the bottom of the second rotating mechanism and is driven to rotate by the second rotating mechanism, a through hole being arranged in the middle of the third flange connecting mechanism to accommodate the other end of the second concrete delivery pipe extending through the second flange connecting mechanism and the second rotating mechanism; a second rotating arm, one end of which is fixedly connected with one side of the third flange connecting mechanism; a third concrete delivery pipe, one end of which extends upward into the through hole of the third flange connecting mechanism and is in sealed communication with the other end of the second concrete delivery pipe and can rotate relative to the second concrete delivery pipe, the middle of which extends along the direction of the second rotating arm and is supported by the second rotating arm, and the other end of which is used to extend to the position to be poured.

[0017] The continuous pouring method of the prefabricated box girder has the following advantages: (1) The mobile distributor is provided, which is mobile and flexible, and the time for shifting the mobile distributor is shortened, so that the continuous pouring of the prefabricated girder can be better realized.

[0018] (2) Since the mobile and flexible mobile distributor is provided, the length of each pouring area can be shortened, and the uniformity of the distribution is better ensured, and the pouring quality of the prefabricated girder is improved.

[0019] (3) The belt conveyor capable of adjusting the concrete delivery distance is further provided in combination with the mobile distributor, so that the requirements for the segmented, horizontal layered and rapid and continuous pouring adjustment of the prefabricated girder can be better met, so that the continuous pouring of the prefabricated girder from one end to the other end is realized, the continuity of the operation is ensured, and the pouring quality of the prefabricated girder is improved.

[0020] (4) The present application improves the automatic operation level of the prefabricated girder concrete continuous pouring machine, reduces the labor intensity of the operating personnel, and reduces the dependence on manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a step schematic diagram of the present application.

[0022] Figure 2The schematic diagram of the division of the pouring area.

[0023] Figure 3 The schematic diagram of the vertical section pouring grid layer division along the width direction of the standard section of the railway prefabricated box girder.

[0024] Figure 4 The schematic diagram of the vertical section pouring grid layer division along the width direction of the partition wall section of the railway prefabricated box girder.

[0025] Figure 5 The schematic diagram of the vertical section pouring grid division along the length direction of the railway prefabricated box girder (position of the chamfered area on both sides of the bottom plate, position of the web plate area, position of the flange plate area on both sides).

[0026] Figure 6 The schematic diagram of the vertical section pouring grid division along the length direction of the partition wall section of the railway prefabricated box girder (position of the middle part of the bottom plate, position of the middle part of the top plate).

[0027] Figure 7 The schematic diagram of the structure of the automatic concrete pouring control system.

[0028] Figure 8 The schematic diagram of the front view structure of the fixed section of the rack.

[0029] Figure 9 The schematic diagram of the top view structure of Figure 8 .

[0030] Figure 10 The schematic diagram of the A-A section structure of Figure 8 .

[0031] Figure 11 The schematic diagram of the B-B section structure of Figure 8 .

[0032] Figure 12 The schematic diagram of the front view structure of the movable section of the rack.

[0033] Figure 13 The schematic diagram of the top view structure of Figure 12 .

[0034] Figure 14 The schematic diagram of the C-C section structure of Figure 12 .

[0035] Figure 15 The schematic diagram of the D-D section structure of Figure 12 .

[0036] Figure 16 The schematic diagram of the front view structure of the belt conveyor.

[0037] Figure 17 The schematic diagram of the front view structure of the mobile distributor.

[0038] Figure 18 is Figure 17 a left view structural schematic diagram of the material distribution machine.

[0039] Figure 19 is Figure 18 a top view structural schematic diagram of the material distribution machine.

[0040] Figure 20 a structural schematic diagram of the material distribution machine frame, ladder and working platform.

[0041] Figure 21 a structural schematic diagram of the prefabricated beam concrete automatic pouring construction device in one implementation state.

[0042] Figure 22 a structural schematic diagram of the prefabricated beam concrete automatic pouring construction device in another implementation state.

[0043] In the figure, the frame fixed section 100, the fixed section belt conveying mechanism 110, the fixed section belt driven shaft 111, the fixed section belt 112, the fixed section roller 113, the fixed section belt driving shaft 114, the fixed section belt driving motor 115, the fixed section driving speed reduction unit 116, the fixed section support frame body 120, the fixed section bottom longitudinal beam 121, the fixed section support stand 122, the fixed section top longitudinal beam 123, the fixed section limiting longitudinal beam 124, the fixed section cross beam 125, the fixed section inclined brace 126, the fixed section walking mechanism 130, the limiting roller 140, the roller 150, the telescopic driving mechanism 160, the telescopic driving motor 161, the telescopic driving first speed reduction gear 162, the telescopic driving mechanism platform 163, the roller rotating shaft 164, the rotating shaft support column 165, the telescopic driving second speed reduction gear 166, the frame movable section 200, the movable section belt conveying mechanism 210, the movable section belt driven shaft 211, the movable section belt 212, the movable section roller 213, the movable section belt driving shaft 214, the movable section belt driving motor 215, the movable section motor platform 216, the movable section transmission chain 217, the movable section longitudinal beam 220, the movable section support stand 230, the movable section walking mechanism 240, the movable section longitudinal beam connecting frame 250, the limiting sensor 260, the mobile material distribution machine 300, the material distribution machine walking mechanism 301, the material distribution machine frame 302, the first concrete conveying pipe 303, the aggregate tank 304, the first rotary mechanism 305, the first flange connecting mechanism 306, the first rotating arm 307, the second concrete conveying pipe 308, the second rotary mechanism 309, the second flange connecting mechanism 310, the third flange connecting mechanism 311, the second rotating arm 312, the third concrete conveying pipe 313, the ladder 314, the working platform 315, the working platform fence 316, the prefabricated beam 400, the concrete hopper 500. DETAILED DESCRIPTION

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0045] This embodiment takes a precast railway box girder as an example, and describes a continuous casting method for precast box girders, combined with... Figure 1 As shown, it includes the following steps: S1. Casting Zone Division: The cross-section of the precast box girder formwork is divided into 2n casting zones, with the centerline of the girder width dividing them into two sides, such as... Figure 2 As shown, each side has n pouring areas, each with a length of 8.0-10.0m. In this embodiment, the precast beam is poured using a combination of a mobile placing boom 300 and a belt conveyor. The setting of these pouring areas is mainly to correspond to the positioning points of the mobile placing boom 300. At these positioning points, the cantilever of the mobile placing boom 300 can cover the concrete in the pouring area, and the length is controlled within a certain range, improving the cantilever control accuracy of the mobile placing boom 300, better ensuring the uniformity of the concrete placement, and improving the concrete pouring quality of the precast beam. Corresponding to the n positioning points, the belt conveyor changes the conveying length n times to complete one layer of pouring. In this embodiment, the precast box girder is divided into 8 pouring areas, with 4 pouring areas set on each side, namely pouring area A, pouring area B, pouring area C, pouring area D, pouring area E, pouring area F, pouring area G, and pouring area H. Each pouring area is further divided into multiple pouring grids, the length of each pouring grid is 1 / 2 of the length of the pouring area, the width is the width of the vertical area position of the prefabricated box girder formwork, and the height is determined according to the vertical area position of the prefabricated box girder formwork. The vertical area position includes the chamfer area position on both sides of the bottom plate, the middle area position of the bottom plate, the web area position, the flange plate area position on both sides, and the middle area position of the top plate. The pouring grid height of the chamfer area position on both sides is 36-40 cm. The pouring grid height of the bottom layer of the middle area position of the bottom plate is 26-30 cm. If the pouring grid height of the bottom layer of the middle area position of the bottom plate is exceeded, the remaining height is the pouring grid height of the second layer of the middle area position of the bottom plate. The pouring grid height of the web area position is 28-30 cm per layer except the top layer, and the height of the top layer is controlled to be 28-30 cm. The pouring grid height of the flange plate area position on both sides is equal to the height of the flange plate area position on both sides. The pouring grid height of the middle area position of the top plate is equal to the height of the middle area position of the top plate. The forward pouring area and the reverse pouring area are determined at the same time. The reverse pouring area is the pouring grid at the last end of each layer, and the forward pouring area is the other pouring grids. The setting of the forward pouring area and the reverse pouring area can control the pouring folding point to be in the middle of the beam. S2. Pouring of the chamfer area position on both sides of the bottom plate: synchronous and symmetric layer-by-layer pouring from one end of the prefabricated box girder formwork on both sides to the other end, one movable distributor 300 and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outside of each pouring area, and in each pouring area, the movable distributor 300 is adjusted in length to uniformly discharge from the front end to the rear end in the forward pouring area and uniformly discharge from the rear end to the front end in the reverse pouring area. S3. Pouring of the middle area position of the bottom plate: synchronous and symmetric layer-by-layer pouring from one end to the other end of the prefabricated box girder formwork, one movable distributor 300 and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outside of each pouring area, and in each pouring area, the movable distributor 300 is adjusted in length to make the discharge port of the movable distributor 300 extend to the inner form distribution skylight for discharging. S4. Pouring of the web plate region position: the pouring grids from one end of the precast box girder formwork to the other end of the pouring grids are poured by using the horizontal layering, oblique segmenting pouring method for synchronous symmetric pouring, one mobile distributor 300 and one belt conveyor combined device are arranged on each side of the precast box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outside of each pouring region, in each pouring region, the cantilever length of the mobile distributor 300 is adjusted, uniform feeding is performed from the front end to the rear end in the forward pouring area, and uniform feeding is performed from the rear end to the front end in the reverse pouring area; after each horizontal layering pouring is completed, except for the pouring grid that has reached the top layer of the web plate region, the other preceding pouring grid is one layer higher than the adjacent following pouring grid, and the pouring time of the two layers cannot exceed the initial setting time of the concrete; S5. Pouring of the flange plate region position on both sides: one mobile distributor 300 and one belt conveyor combined device are arranged on each side of the precast box girder formwork, the combined device on one side is started to pour from one end of the pouring grid to the other end of the pouring grid, n distributor positioning points are arranged on each side, corresponding to the outside of each pouring region, in each pouring region, the cantilever length of the mobile distributor 300 is adjusted, uniform feeding is performed from the front end to the rear end in the forward pouring area, and uniform feeding is performed from the rear end to the front end in the reverse pouring area; after the pouring on one side is completed, the pouring on the other side is repeated to complete the pouring according to the above steps; S6. Pouring of the top plate middle region position: one mobile distributor 300 and one belt conveyor combined device are arranged on one side of the precast box girder formwork, the combined device pours from one end of the pouring grid to the other end of the pouring grid, n distributor positioning points are arranged on one side, corresponding to the outside of each pouring region, in each pouring region, the cantilever length of the mobile distributor 300 is adjusted, the mobile distributor 300 is aligned with the center line of the precast girder width, uniform feeding is performed from the front end to the rear end in the forward pouring area, and uniform feeding is performed from the rear end to the front end in the reverse pouring area.

[0046] Taking the railway precast box girder as an example, the pouring method is specifically described as follows: S1. Pouring region division: the cross section of the precast box girder formwork is divided into 8 pouring regions, the length is 8.15m, one side is sequentially divided into pouring region A, pouring region B, pouring region C, pouring region D from front to back, and the other side is sequentially divided into pouring region E, pouring region F, pouring region G, pouring region H from front to back, in this way, the mobile distributor 300 has 4 positioning points on each side of the precast box girder formwork, and the belt conveyor changes the conveying length by 4 times to complete one layer of pouring.

[0047] Each pouring area is further divided into multiple pouring grids, the length of each pouring grid is 1 / 2 of the length of the pouring area, the width is the width of the vertical area position of the prefabricated box girder formwork, and the height is determined according to the vertical area position of the prefabricated box girder formwork. The vertical area position includes the bottom plate two side chamfer area position, the bottom plate middle area position, the web area position, the two side flange plate area position, and the top plate middle area position. Among them: the pouring grid height of the two side chamfer area position is 38.5cm, and two layers are correspondingly arranged. The pouring area A and the pouring area E correspond to 1-1, 1-2, 2-1, 2-2, four pouring grids, the pouring area B and the pouring area F correspond to 1-3, 1-4, 2-3, 2-4, four pouring grids, the pouring area C and the pouring area G correspond to 1-5, 1-6, 2-5, 2-6, four pouring grids, and the pouring area D and the pouring area H correspond to 1-7, 1-8, 2-7, 2-8, four pouring grids, a total of 32 pouring grids. Figure 3 The bottom plate middle area position is distinguished according to the railway prefabricated box girder standard section and the railway prefabricated box girder partition wall section. In the standard section, combined with Figure 4 and Figure 6As shown, the height of the middle region of the bottom plate is greater, 30.0 cm, especially the outer end of the pouring area A, the pouring area D, the pouring area E and the pouring area H, which can reach 60.0 cm, so it is divided into two layers, and thus it is divided into one layer at a position with a height of 30.0 cm and two layers at a position with a height greater than 30.0 cm, and the pouring area A, the pouring area E correspond to three pouring grids 3-1, 3-2, 4-1, the pouring area B, the pouring area F correspond to two pouring grids 3-3, 3-4, the pouring area C, the pouring area G correspond to two pouring grids 3-5, 3-6, the pouring area D, the pouring area H correspond to three pouring grids 3-7, 3-8, 4-2, a total of 20 pouring grids. It should be noted that the pouring area A and the pouring area E, the pouring area B and the pouring area F, the pouring area C and the pouring area G, the pouring area D and the pouring area H are connected together, so the pouring grids with the same label corresponding thereto are also connected together, and the pouring of the concrete is not obviously separated, and the concrete poured from both sides will mix together; the pouring grid height of the web area position is divided into layers by referring to the height of each layer, which is 30 cm on average, so the standard section is divided into 6 layers, each layer has a height of 30 cm, and the partition wall section is divided into 6 layers, except that the top layer has a height of 28.2 cm, the other layers have a height of 30 cm, so the pouring area A, the pouring area E correspond to twelve pouring grids 5-1, 5-2, 6-1, 6-2, 7-1, 7-2, 8-1, 8-2, 9-1, 9-2, 10-1, 10-2, the pouring area B, the pouring area F correspond to twelve pouring grids 5-3, 5-4, 6-3, 6-4, 7-3, 7-4, 8-3, 8-4, 9-3, 9-4, 10-3, 10-4, the pouring area C, the pouring area G correspond to twelve pouring grids 5-5, 5-6, 6-5, 6-6, 7-5, 7-6, 8-5, 8-6, 9-5, 9-6, 10-5, 10-6, the pouring area D, the pouring area H correspond to twelve pouring grids 5-7, 5-8, 6-7, 6-8, 7-7, 7-8, 8-7, 8-8, 9-7, 9-8, 10-7, 10-8, a total of 96 pouring grids; the pouring grid height of the two side flange plate region position is equal to the height of the two side flange plate region position, i.e. only one layer, the pouring area A, the pouring area E correspond to two pouring grids 11-1, 11-2, the pouring area B, the pouring area F correspond to two pouring grids 11-3, 11-4, the pouring area C, the pouring area G correspond to two pouring grids 11-5, 11-6, the pouring area D, the pouring area H correspond to two pouring grids 11-7, 11-8, a total of 16 pouring grids; combined with Figure 6As shown, the pouring grid height at the middle region of the top plate is equal to the height of the middle region of the top plate, i.e. only one layer, and the pouring area A and the pouring area E correspond to two pouring grids 12-1 and 12-2, the pouring area B and the pouring area F correspond to two pouring grids 12-3 and 12-4, the pouring area C and the pouring area G correspond to two pouring grids 12-5 and 12-6, and the pouring area D and the pouring area H correspond to two pouring grids 12-7 and 12-8.

[0048] S2. Pouring at the chamfered region on both sides of the bottom plate: synchronously symmetrically pouring layer by layer from one end of the pouring grid on both sides of the prefabricated box girder formwork to the other end, one mobile distributor 300 and one belt conveyor combined device are arranged on each side of the prefabricated box girder formwork, and then pouring in the following order: 2.1 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of the pouring area A and the pouring area E, so that the discharge port of the mobile distributor 300 uniformly discharges from the front end to the rear end in the discharge area above the pouring grids 1-1 and 1-2; 2.2 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of the pouring area B and the pouring area F, so that the discharge port of the mobile distributor 300 uniformly discharges from the front end to the rear end in the discharge area above the pouring grids 1-3 and 1-4; 2.3 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of the pouring area C and the pouring area G, so that the discharge port of the mobile distributor 300 uniformly discharges from the front end to the rear end in the discharge area above the pouring grids 1-5 and 1-6; 2.4 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of the pouring area D and the pouring area H, so that the discharge port of the mobile distributor 300 uniformly discharges from the front end to the rear end in the discharge area above the pouring grid 1-7 and uniformly discharges from the rear end to the front end in the discharge area above the pouring grid 1-8; repeat the above steps 2.1-2.4 to complete the pouring of the pouring grids 2-1 to 2-8; during the above process, the mobile distributor 300 is discharged, and the corresponding position is synchronously started to automatically vibrate by the attached vibrator.

[0049] S3. Pouring of the middle region position of the bottom plate: synchronously and symmetrically pouring layer by layer from one end to the other end of the precast box girder formwork, one mobile distributor 300 and one belt conveyor combined device are arranged on each side of the precast box girder formwork, for the standard section, pouring in the following order: 3.1 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area A and pouring area E, so that the discharge port of the mobile distributor 300 is aligned with the corresponding inner form window of pouring grid 1-1, 1-2 in turn; 3.2 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area B and pouring area F, so that the discharge port of the mobile distributor 300 is aligned with the corresponding inner form window of pouring grid 1-3, 1-4 in turn; 3.3 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area C and pouring area G, so that the discharge port of the mobile distributor 300 is aligned with the corresponding inner form window of pouring grid 1-5, 1-6; 3.4 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area D and pouring area H, so that the discharge port of the mobile distributor 300 is aligned with the corresponding inner form window of pouring grid 1-7, 1-8. For the partition wall section, in addition to the above steps 3.1-3.4, it also includes: 3.5 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area A and pouring area E, so that the discharge port of the mobile distributor 300 is aligned with the corresponding inner form window of pouring grid 4-1; 3.6 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area D and pouring area H, so that the discharge port of the mobile distributor 300 is aligned with the corresponding inner form window of pouring grid 4-2. In the above process, manual paving and vibrating are assisted in the box chamber when the mobile distributor 300 discharges.

[0050] S4. Pouring of the web plate area position: respectively from the precast box girder formwork two sides of one end of the pouring grid to the other end of the pouring grid adopts horizontal stratification, oblique segmentation pouring method for synchronous symmetric pouring, precast box girder formwork each side is provided with a mobile distributor 300 and a belt conveyor combination device, pouring in the following order: 4.1 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area A and pouring area E, so that the discharge port of the mobile distributor 300 is uniformly discharged from the front end to the rear end of the pouring grid 5-1 above the discharge area; 4.2 the discharge port of the mobile distributor 300 is uniformly discharged from the front end to the rear end of the pouring grid 6-1, 5-2 above the discharge area in turn, forming oblique segmented pouring; 4.3 the discharge port of the mobile distributor 300 is uniformly discharged from the front end to the rear end of the pouring grid 7-1, 6-2 above the discharge area in turn; 5.4 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area B and pouring area F, so that the discharge port of the mobile distributor 300 is uniformly discharged from the front end to the rear end of the pouring grid 5-3 above the discharge area; 5.5 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area A and pouring area E, so that the discharge port of the mobile distributor 300 is uniformly discharged from the front end to the rear end of the pouring grid 8-1, 7-2 above the discharge area in turn; 5.6 the front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area B and pouring area F, so that the discharge port of the mobile distributor 300 is uniformly discharged from the front end to the rear end of the pouring grid 6-3, 5-4 above the discharge area in turn; referring to the above oblique pouring method, the concrete of the 10th layer of pouring grid is directly poured layer by layer; it should be noted that the pouring grid in the same column is not poured again after pouring to the top layer, and the column of pouring grid after the top layer is continued to be poured by referring to the oblique pouring method. It should be noted that when discharging the pouring grid 5-8, 6-8, 7-8, 8-8, 9-8, 10-8, it is uniformly discharged from the rear end to the front end of the pouring grid. In the above process, when the mobile distributor 300 discharges, the corresponding position of the attached vibrator is started automatically.

[0051] S5. Pouring of both side flange plate area positions: one mobile distributor 300 and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, and then poured in the following order: 5.1 The front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area A and pouring area E, so that the discharge port of the mobile distributor 300 uniformly and evenly discharges from the front end to the rear end of the pouring grid 11-1, 11-2; 5.2 The front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area B and pouring area F, so that the discharge port of the mobile distributor 300 uniformly and evenly discharges from the front end to the rear end of the pouring grid 11-3, 11-4; 5.3 The front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area C and pouring area G, so that the discharge port of the mobile distributor 300 uniformly and evenly discharges from the front end to the rear end of the pouring grid 11-5, 11-6; 5.4 The front end of the belt conveyor on both sides and the mobile distributor 300 are adjusted to the outside of pouring area D and pouring area H, so that the discharge port of the mobile distributor 300 uniformly and evenly discharges from the front end to the rear end of the pouring grid 11-7, and uniformly and evenly discharges from the rear end to the front end of the pouring grid 11-8; after pouring on one side is completed, repeat the above steps 5.1-5.4 to complete the pouring of pouring grids 2-1 to 2-8 on one side of pouring areas E-H; during the above process, the mobile distributor 300 is discharged, and the corresponding position of the attached vibrator is started automatically.

[0052] S6. Pouring in the middle area of the top plate: a mobile distributor 300 and a belt conveyor combination device are arranged on one side of the prefabricated box girder formwork, and then pouring is carried out in the following order: 2.1 The front end of the belt conveyor and the mobile distributor 300 are adjusted to the outside of pouring area A and pouring area E, the discharge port of the mobile distributor 300 is aligned with the center line of the width of the prefabricated beam, and the mobile distributor 300 is uniformly discharged at a constant speed from the front end to the rear end of the discharge area above the pouring grid 12-1, 12-2, while pouring area A and pouring area E in the middle of the top plate are poured; 2.2 The front end of the belt conveyor and the mobile distributor 300 are adjusted to the outside of pouring area B and pouring area F, the discharge port of the mobile distributor 300 is aligned with the center line of the width of the prefabricated beam, and the mobile distributor 300 is uniformly discharged at a constant speed from the front end to the rear end of the discharge area above the pouring grid 12-3, 12-4, while pouring area B and pouring area F in the middle of the top plate are poured; 2.3 The front end of the belt conveyor and the mobile distributor 300 are adjusted to the outside of pouring area C and pouring area G, the discharge port of the mobile distributor 300 is aligned with the center line of the width of the prefabricated beam, and the mobile distributor 300 is uniformly discharged at a constant speed from the front end to the rear end of the discharge area above the pouring grid 12-5, 12-6, while pouring area C and pouring area G in the middle of the top plate are poured; 2.4 The front end of the belt conveyor and the mobile distributor 300 are adjusted to the outside of pouring area D and pouring area H, the discharge port of the mobile distributor 300 is uniformly discharged at a constant speed from the front end to the rear end of the discharge area above the pouring grid 1-7, and uniformly discharged at a constant speed from the rear end to the front end of the discharge area above the pouring grid 1-8, while pouring area D and pouring area H in the middle of the top plate are poured; during the above process, the mobile distributor 300 is discharged, and the corresponding position of the attached vibrator is automatically vibrated synchronously.

[0053] n distributor positioning points are arranged on each side, corresponding to the outside of each pouring area, and in each pouring area, the cantilever length of the mobile distributor 300 is adjusted to align the mobile distributor 300 with the center line of the width of the prefabricated beam, and the mobile distributor 300 is uniformly discharged from the front end to the rear end in the forward pouring area and uniformly discharged from the rear end to the front end in the reverse pouring area.

[0054] Preferably, the mobile distributor 300 is matched with a belt conveyor with adjustable conveying length, and the length of the conveying distance is changed by the belt conveyor with adjustable conveying length, so that the length of the belt conveyor conveying concrete can be adaptively adjusted after the mobile distributor 300 moves, so that the discharge end of the belt conveyor can be quickly adjusted to the outside of the corresponding pouring area to continuously supply the mobile distributor 300, without using a gantry crane or a trolley to transport the mobile distributor 300 back and forth to receive the material.

[0055] The belt conveyor feeding is matched with the mobile distributor 300 Figure 21 , Figure 22As shown in the figure, the two groups of belt conveyors and the mobile distributor 300 combination device work simultaneously in the above steps S2-S6, the discharge end of the belt conveyor and the mobile distributor 300 can be quickly adjusted from the pouring area A to the pouring area B, from the pouring area E to the pouring area F, and the horizontal layering and distribution pouring is realized, the pouring time of one precast beam is not more than 6h, which meets the requirements of one-time forming, and the continuous pouring of the precast beam 400 is well realized. Of course, the discharge end of the belt conveyor on one side and the mobile distributor 300 are adjusted to the pouring area C, the pouring area D, and the discharge end of the belt conveyor on the other side is adjusted to the pouring area G, the pouring area H, which also refers to the above-mentioned change of the length of the conveying distance, which meets the requirements of continuous feeding.

[0056] In order to improve the automation level of the precast beam pouring, the mobile distributor 300 and the belt conveyor are controlled by the concrete automatic pouring control system. Figure 7 As shown in the figure, the concrete automatic pouring control system includes a central processor, a measurement control module, a measurement module, a data collection module, a data collection module, an execution control module, a concrete feeding control module, a concrete pouring control module and a vibration control module, wherein: the measurement control module is connected with the central processor; the measurement module is connected with the measurement control module, including a concrete temperature measurement module and a formwork temperature measurement module, the concrete temperature measurement module includes a first temperature sensor for measuring the temperature of the concrete initially entering the belt conveyor, and the formwork temperature measurement module includes a second temperature sensor for measuring the temperature of the concrete flowing out of the discharge end of the distributor; the data collection module is connected with the measurement module and the central processor, and is used for collecting the data measured by the measurement module and feeding back to the central processor; the execution control module is connected with the central processor; the concrete feeding control module is connected with the execution control module and the belt conveyor, and is used for controlling the feeding of the belt conveyor; the concrete pouring control module is connected with the execution control module and the distributor, and is used for controlling the opening and closing and speed of the distributor; the vibration control module is connected with the execution control module and the attached vibrator arranged on the box girder formwork, and is used for controlling the opening and closing and frequency of the attached vibrator. The concrete automatic pouring control system is designed according to the pouring requirements, wherein the temperature control is crucial for the mass concrete precast beam, and improper control is easy to cause temperature cracks, wherein the first temperature sensor can adopt a digital probe sensor, which is installed in the concrete hopper 500 connected with the belt conveyor, and adopts RTU data acquisition and transmission. The second temperature sensor can adopt a patch type digital temperature sensor, which is installed on the back rib of the precast beam formwork, cooperates with a micro node to perform data acquisition and transmission, and mainly plays a role of measuring the concrete mold temperature.

[0057] Based on automatically collected temperature data, the central processing unit issues instructions. If the pouring requirements are met, a pouring instruction is issued; if not, a rectification instruction is issued. Each box girder to be poured is numbered. Upon issuing the pouring instruction, the concrete hopper at 500mm begins discharging. Temperature sensors installed on the hopper at 500mm re-measure the concrete's temperature upon entering the formwork. A belt conveyor circulates the concrete, and the concrete placing machine synchronizes with the conveyor, placing the concrete along a set trajectory. Simultaneously, the attached vibrator is activated, vibrating synchronously according to the pouring area, thus improving the automation level of the pouring process.

[0058] This embodiment provides a belt conveyor with adjustable conveying length, such as... Figure 16 As shown, it includes a fixed rack section 100 and a movable rack section 200, wherein: the fixed rack section 100, combined with... Figures 8-11 As shown, it includes a fixed section support frame 120, a fixed section traveling mechanism 130, and a fixed section belt conveyor mechanism 110. The fixed section support frame 120 has a traveling channel inside along the conveying direction of the fixed section belt conveyor mechanism 110. Two rows of adjusting units are symmetrically fixed at intervals on the inner side facing the traveling channel. Figure 9 and Figure 11 As shown, the fixed section support frame 120 is generally a cubic frame. The adjustment unit is symmetrical about the centerline in the width direction of the fixed section support frame 120. The bottom of the fixed section support frame 120 is connected to the fixed section traveling mechanism 130, and the top is equipped with a fixed section belt conveyor mechanism 110. The fixed section traveling mechanism 130 generally uses wheels to allow the frame fixed section 100 to move. It can be matched with a fixed section traveling mechanism drive unit, such as a motor, to drive the frame fixed section 100 to move. The fixed section belt conveyor mechanism 110 is used to transport concrete. The belt has side guards on both sides to prevent concrete from falling. The fixed section belt conveyor mechanism 110 can be set on the top section of the fixed section support frame 120, or the conveying path can be shortened and it can only be set on the front section of the fixed section support frame 120, i.e. Figure 1 The structure shown. The frame movable section 200, combined with... Figures 12-15As shown, the movable section is slidably arranged in the walking channel, including movable section longitudinal beams 220, movable section support columns 230, movable section walking mechanisms 240 and movable section belt conveying mechanisms 210, the movable section longitudinal beams 220 are symmetrically arranged in two, arranged above two rows of adjusting units along the conveying direction of the fixed section belt conveying mechanism 110, and can match the movable section belt conveying mechanism 210, the front end is connected with the movable section support column 230, the movable section belt conveying mechanism 210 can slide forward and backward relative to the adjusting unit, the bottom of the movable section support column 230 is connected with the movable section walking mechanism 240, and the movable section belt conveying mechanism 210 is arranged below the fixed section belt conveying mechanism 110; the movable section of the rack 200 mainly relies on the support of the movable section support column 230 and the adjusting unit to walk in the walking channel, and the movable section belt conveying mechanism 210 is also provided with a flange on both sides of the belt, and the concrete conveyed by the fixed section belt conveying mechanism 110 to the front end of the fixed section support frame body 120 falls to the movable section belt conveying mechanism 210, which is further transported forward by the movable section belt conveying mechanism 210. By adjusting the length of the movable section of the rack 200 extending out of the fixed section 100 of the rack, the length of the concrete transportation path can be adjusted, so that the concrete can be transported to different pouring points at close or long distances, helping to meet the requirements of fast and continuous pouring adjustment of segmented and horizontal layered prefabricated beams.

[0059] In addition, in order to facilitate the introduction of concrete into the fixed section belt conveying mechanism 110, a concrete hopper can be installed above the rear end of the fixed section belt conveying mechanism 110, and the concrete hopper can be fixed above the fixed section support frame body 120 through a fixed frame, and the bottom sides of the fixed frame are connected with the top sides of the fixed section support frame body 120.

[0060] Preferably, in order to better ensure the smooth operation of the movable section belt conveying mechanism 210, the fixed section support frame body 120 includes a fixed section top longitudinal beam 123, a fixed section limiting longitudinal beam 124, a fixed section bottom longitudinal beam 121 and a fixed section support column 122, the fixed section top longitudinal beam 123, the fixed section limiting longitudinal beam 124 and the fixed section bottom longitudinal beam 121 are all symmetrically arranged in two, arranged from top to bottom, and the fixed section top longitudinal beam 123, the fixed section limiting longitudinal beam 124 and the fixed section bottom longitudinal beam 121 on the same side are connected through the fixed section support column 122 arranged at intervals, in order to ensure the stability of the fixed section support frame body 120, the fixed section cross beam 125 can be further connected between the bottoms of the fixed section support columns 122, and the fixed section diagonal brace 126 is arranged in a triangular shape between the fixed section limiting longitudinal beam 124 and the fixed section bottom longitudinal beam 121. Combined Figure 11As shown, the inner side of the fixed section limiting longitudinal beam 124 is rolling connected with a limiting roller 140, which is also symmetrically arranged relative to the center line of the width direction of the fixed section support frame body 120, and is located between the fixed section belt conveying mechanism 110 and the movable section belt conveying mechanism 210, which can match the height position of the movable section belt conveying mechanism 210 to prevent it from deviating due to excessive floating.

[0061] Regarding the adjusting unit, the adjusting roller and the sliding plate can be selected, but the embodiment provides a more preferred structure, which combines Figure 8 As shown, the adjusting unit includes a plurality of rollers and roller shafts matched with the rollers, one end of the roller shaft is fixedly connected with the inner side of the fixed section support frame body, and the other end is rotatably connected with the roller, and a plurality of said rollers are arranged in a horizontal straight line, and in the embodiment, the roller shaft is fixedly connected with the inner side of the fixed section support column 122. The roller has low cost and smooth sliding, and more preferably, the roller 150 is provided with a groove on the side, which can be matched with the movable section longitudinal beam 220, and the groove can be an inverted trapezoidal shape with a small lower part and a large upper part, so as to ensure that the movable section belt conveying mechanism 210 travels along the preset path of the roller 150, and in combination with the arrangement of the limiting roller 140, the movable section belt conveying mechanism 210 can be better prevented from deviating from the preset path.

[0062] Preferably, in order to facilitate the control of the adjustment of the length of the movable section 200 of the rack, the front end of the fixed section 100 of the rack is provided with a telescopic driving mechanism 160, which can drive at least one group of rollers 150 to rotate, and the rollers 150 are driven to slide the movable section longitudinal beam 220, in order to ensure the driving effect, flexible friction materials such as rubber can be arranged on the groove of the roller 150 or the bottom surface of the movable section longitudinal beam 220, so that the rack movable section 200 can be better and smoothly driven to slide, and it is worth noting that the telescopic driving mechanism 160 is located behind the movable section support column 230, so as to avoid the influence of the telescopic driving mechanism 160 on the forward movement of the movable section support column 230.

[0063] Preferably, the embodiment provides a specific telescopic driving mechanism 160, which combines Figure 10As shown, the telescopic driving mechanism 160 includes a telescopic driving mechanism platform 163, a telescopic driving motor 161, a telescopic driving first reduction gear 162, a telescopic driving second reduction gear 166, a roller rotating shaft 164 and a rotating shaft support column 165. The telescopic driving mechanism platform 163 is fixed at the front end of the fixed section 100, and can be connected to the inner side of the fixed section support column 122 at both ends, located below the movable section belt conveying mechanism 210. The telescopic driving motor 161 and the rotating shaft support column 165 are fixed on the telescopic driving mechanism platform 163. The rotating shaft support column 165 is arranged on both sides of the telescopic driving motor 161. The motor shaft of the telescopic driving motor 161 is connected with the telescopic driving first reduction gear 162. The outer periphery of the roller rotating shaft 164 is sleeved with the telescopic driving second reduction gear 166. Both ends pass through the rotating shaft support column 165 and are connected with one group of rollers 150. The telescopic driving second reduction gear 166 is engaged with the telescopic driving first reduction gear 162. The rotating shaft support column 165 is provided with a through hole and embedded with a bearing cooperating with the roller rotating shaft 164 to support the roller rotating shaft 164 through the rotating shaft support column 165. The diameter of the telescopic driving first reduction gear 162 is smaller than that of the telescopic driving second reduction gear 166 to achieve the purpose of speed reduction. The telescopic driving motor 161 rotates forward or reversely, drives the roller rotating shaft 164 through the telescopic driving first reduction gear 162 and the telescopic driving second reduction gear 166, drives the roller 150 to rotate, and then drives the movable section longitudinal beam 220 to move forward or backward. It should be noted that the group of rollers 150 can be selected according to the situation, which can be the first group, or the second group, or the third group and so on from the front end of the fixed section 100. In combination with Figure 11 As shown, the remaining rollers 150 are rotatably connected to one end of the roller support shaft, and the other end of the roller support shaft is connected to the fixed section support frame 120. As shown in the figure, it is connected to the inner side of the fixed section support column 122.

[0064] Preferably, the movable section belt conveying mechanism 210 includes a movable section driving unit arranged at the rear end of the movable section longitudinal beam 220. Figure 12 and Figure 14As shown, the inner side between the movable section longitudinal beam 220 is connected with a downward extending movable section motor platform 216, the movable section belt drive motor 215 is arranged on the movable section motor platform 216, the motor shaft sleeve of the movable section belt drive motor 215 is provided with a movable section driving gear, the movable section belt driving shaft 214 of the movable section belt conveying mechanism 210 is sleeved with a movable section driven gear, the movable section driving gear and the movable section driven gear are provided with a movable section transmission chain 217, so as to drive the movable section belt conveying mechanism 210 to work. More specifically, the movable section belt conveying mechanism 210 further comprises a movable section belt driven shaft 211, a movable section belt 212, a movable section roller 213 and a movable section belt driving shaft 214, the movable section belt driven shaft 211 is rotatably connected with the front end of the movable section longitudinal beam 220, the movable section belt driving shaft 214 is rotatably connected with the rear end of the movable section longitudinal beam 220, the movable section belt 212 is arranged between the movable section belt driven shaft 211 and the movable section belt driving shaft 214, in addition, the movable section roller 213 is arranged between the movable section belt driving shaft 214 and the movable section longitudinal beam 220, and the movable section roller 213 is rotatably connected with the movable section longitudinal beam 220, so as to support the upper surface of the movable section belt 212 to keep a better horizontal state. In addition, in order to ensure the stability of the movable section longitudinal beam 220, the U-shaped movable section longitudinal beam connecting frame 250 is connected between the front end of the movable section longitudinal beam 220, and the lower surface of the movable section longitudinal beam connecting frame 250 is connected with the movable section support column 230.

[0065] Preferably, the fixed section belt conveying mechanism 110 comprises a fixed section driving unit, which is arranged on the outer side of the middle section of the top of the fixed section support frame body 120, so as not to affect the walking of the movable section 200 of the rack, and the fixed section driving unit is connected with the fixed section belt driving motor 115 through the fixed section driving reduction unit 116, so as to drive the fixed section belt conveying mechanism 110 to work. Figure 11 As shown, the outer side of the fixed section support column 122 is provided with a fixed section support platform, and the fixed section belt driving motor 115 is fixed on the fixed section support platform, the fixed section belt driving motor 115 drives the fixed section belt driving shaft 114 of the fixed section belt conveying mechanism 110 through the fixed section driving reduction unit 116, so as to drive the fixed section belt conveying mechanism 110 to work. More specifically, the fixed section belt conveying mechanism 110 further comprises a fixed section belt driven shaft 111, a fixed section belt 112, a fixed section roller 113 and a fixed section belt driving shaft 114, the fixed section belt driving shaft 114 is rotatably connected with the front end of the fixed section top longitudinal beam 123, the fixed section belt driving shaft 114 is rotatably connected with the middle section of the fixed section top longitudinal beam 123, the fixed section belt 112 is arranged between the fixed section belt driving shaft 114 and the fixed section belt driving shaft 114, in addition, the fixed section roller 113 is arranged between the fixed section belt driving shaft 114 and the fixed section top longitudinal beam 123, and the fixed section roller 113 is rotatably connected with the fixed section top longitudinal beam 123, so as to support the upper surface of the fixed section belt 112 to keep a better horizontal state.

[0066] Preferably, the active section longitudinal beam 220 is provided with a limit sensor 260 at a position close to the active section support column 230, the limit sensor 260 is located behind and close to the active section support column 230, when the telescopic driving mechanism 160 is sensed by the limit sensor 260, a reminder or feedback can be sent to the control unit to stop the rack active section 200 from walking towards the telescopic driving mechanism 160 to avoid damaging the telescopic driving mechanism 160.

[0067] The belt conveyor described above has the following advantages: (1) The fixed section walking mechanism 130 and the active section walking mechanism 240 are provided, which is flexible to move and can walk according to needs, improving the flexibility of the belt conveyor and adjusting the conveying length flexibly according to the change of the pouring point; (2) The concrete hopper 500 can be configured to receive materials at a fixed point, simplifying the layout of the feeding device and avoiding the defect of difficult management caused by long-distance transportation of the concrete tank truck; (3) As long as the supply end is stable, the mobile telescopic belt conveyor can continuously feed to ensure the continuous pouring of the precast beam.

[0068] The embodiment also provides a specific mobile distributor 300, wherein the mobile distributor 300 comprises a material collecting tank 304 which can be matched and moved to below the front end of the active section belt conveying mechanism 210. Figure 21 And Figure 22 The concrete is put into the concrete hopper 500, the concrete hopper 500 flows into the fixed section belt conveying mechanism 110, the concrete at the front end of the fixed section belt conveying mechanism 110 enters the active section belt conveying mechanism 210, and then is conveyed to the front end of the active section belt conveying mechanism 210, introduced into the material collecting tank 304, and then poured into the precast beam 400. By adjusting the extension length of the active section belt conveying mechanism 210 relative to the fixed section belt conveying mechanism 110, the fixed section belt conveying mechanism 110 can walk to different area positions of the precast beam 400, and continuous feeding by the belt conveyor and cooperation of the mobile distributor 300 with the belt conveyor to quickly move to the specified pouring point can meet the requirements of fast and continuous pouring adjustment of the precast beam 400 in the embodiment. And by providing the belt conveyor capable of transporting concrete for a long distance, the pouring arm of the distributor can be shortened, so that the responsiveness of the positioning and movement of the pouring arm can be improved, and the pouring point positioning is more accurate.

[0069] Preferably, the embodiment provides a specific mobile distributor 300, which is combined with Figures 14-16As shown, the mobile distributor 300 comprises a distributor frame 302, a distributor traveling mechanism 301, a collecting hopper 304, a first concrete delivery pipe 303, a first rotating mechanism 305, a first flange connecting mechanism 306, a second concrete delivery pipe 308, a first rotating arm 307, a second flange connecting mechanism 310, a second rotating mechanism 309, a third flange connecting mechanism 311, a second rotating arm 312 and a third concrete delivery pipe 313, wherein: the distributor frame 302 is generally a cubic frame structure; the distributor traveling mechanism 301 is fixed at the bottom of the distributor frame 302 to facilitate moving the whole mobile distributor 300, generally adopts traveling wheels, and can be equipped with a distributor traveling driving unit such as a motor to drive the distributor traveling mechanism 301 to move through a reduction mechanism, automatically enters and exits a working point, has high flexibility, and can lock the traveling wheels to ensure the safety of the work; the collecting hopper 304 is arranged in the distributor frame 302 and is internally provided with a concrete pump, and the concrete delivered by a belt conveyor enters the collecting hopper 304 and then is distributed; the lower end of the first concrete delivery pipe 303 is connected with the outlet of the concrete pump, and the upper end extends to the top of the distributor frame 302; the first rotating mechanism 305 is fixed at the top of the distributor frame 302 and can be connected with a fixed platform arranged at the top of the distributor frame 302; the first flange connecting mechanism 306 is fixedly connected at the top of the first rotating mechanism 305 and is driven to rotate by the first rotating mechanism 305, and a through hole is arranged in the middle to accommodate the upper end of the first concrete delivery pipe to extend into; the second concrete delivery pipe 308 is in an inverted U shape, one end of which extends into the through hole of the first flange connecting mechanism 306 and is in sealed communication with the upper end of the first concrete delivery pipe 303, and the second concrete delivery pipe 308 can rotate relative to the first concrete delivery pipe 303, thus, a sealing ring needs to be arranged at the position where the first concrete delivery pipe 303 and the second concrete delivery pipe 308 contact to prevent concrete from leaking out, and the sealing ring can be used in connection with a connecting sleeve which is commonly used at the position where the concrete pump truck connects the pipe, and will not be described here in detail, and the through hole of the first rotating mechanism 305 is preferably larger than the outer diameter of the first concrete delivery pipe 303 and the second concrete delivery pipe 308 to accommodate the sealing ring and the connecting sleeve and facilitate observing the butt joint condition; the first rotating arm 307 is fixedly connected at one end with one side of the first flange connecting mechanism 306 and supports the second concrete delivery pipe 308 at the top, and the second flange connecting mechanism 310 is fixedly connected at one end with the other side of the first flange connecting mechanism 306 and supports the second rotating mechanism 309 at the top, and the third flange connecting mechanism 311 is fixedly connected at one end with the second rotating mechanism 309 and supports the second rotating arm 312 at the top, and the second rotating arm 312 is fixedly connected at one end with the third flange connecting mechanism 311 and supports the third concrete delivery pipe 313 at the top. Figure 15As shown, in this embodiment, the first rotating arm 307 is welded with the first flange connecting mechanism 306, of course, bolt connection can also be used according to the situation, the first rotating arm 307 is fixed with a connecting piece thereon to realize the fixation of the second concrete conveying pipe 308; the first flange connecting mechanism 306 is driven to rotate by the first rotating mechanism, and then the first rotating arm 307 and the second concrete conveying pipe 308 are driven to rotate to change the direction of the second concrete conveying pipe 308. The second flange connecting mechanism 310 is fixedly connected with the other end of the first rotating arm 307 on one side, and the connection mode can refer to the connection mode of the one end of the first rotating arm 307 and the first flange connecting mechanism 306; the second rotating mechanism 309 is fixedly connected with the bottom of the second flange connecting mechanism 310 on the top; the third flange connecting mechanism 311 is connected with the bottom of the second rotating mechanism 309 and is driven to rotate by the second rotating mechanism 309, a through hole is arranged in the middle to accommodate the other end of the second concrete conveying pipe 308 extending into the second flange connecting mechanism 310 and the second rotating mechanism 309; the second rotating arm 312 is fixedly connected with one side of the third flange connecting mechanism 311 on one end; the third concrete conveying pipe 313 is extended upward into the through hole of the third flange connecting mechanism 311 on one end, is in sealed communication with the other end of the second concrete conveying pipe, is extended along the direction of the second rotating arm 312 in the middle and is fixedly supported by the second rotating arm 312, and the other end is used to extend to the position to be poured, the one end of the third concrete conveying pipe 313 is in sealed communication with the other end of the second concrete conveying pipe 308, and the third concrete conveying pipe 313 can rotate relative to the second concrete conveying pipe 308, a sealing ring needs to be arranged at the contact position to prevent concrete from leaking out, the sealing ring can be matched with a connecting sleeve, which is commonly used at the position of the concrete pump truck, and details are not described here, the through hole of the second rotating mechanism 309 is preferably larger than the outer diameters of the second concrete conveying pipe 308 and the third concrete conveying pipe 313 to accommodate the sealing ring and the connecting sleeve and facilitate observation of the butt joint condition; the second rotating mechanism 309 drives the third flange connecting mechanism 311 to rotate, and then drives the second rotating arm 312 and the third concrete conveying pipe 313 to rotate to adjust the angle of the third concrete conveying pipe 313. By adjusting the angles of the second concrete conveying pipe 308 and the third concrete conveying pipe 313, the position of the mobile distributor 300 can be adjusted to realize more accurate positioning of the distribution.

[0070] Preferably, the distributor frame 302 is provided with a ladder 314 in the height direction, and a work platform 315 is arranged on the top, and a work platform fence 316 is arranged on one side of the work platform 315, and the work platform fence 316 is generally installed on one side where the first rotating arm 307 is not arranged to avoid the rotation of the first rotating arm 307. Through the ladder 314 and the work platform fence 316, the maintenance work of the equipment can be facilitated, and the safety of the construction personnel can be ensured.

Claims

1. A continuous casting method of a precast box girder, characterized by The method comprises the following steps: S1. Pouring area division: the cross section of the prefabricated box girder formwork is divided into 2n pouring areas, which are divided into two sides by the center line of the beam body width, and n pouring areas are arranged on each side, and the length of each pouring area is 8.0-10.0 m; each pouring area is further divided into a plurality of pouring grids, the length of each pouring grid is 1 / 2 of the length of the pouring area, and the height is determined according to the vertical area position of the prefabricated box girder formwork, wherein the vertical area position comprises the chamfer area position on both sides of the bottom plate, the middle area position of the bottom plate, the web area position, the flange plate area position on both sides, and the middle area position of the top plate, and wherein: the pouring grid height of the chamfer area position on both sides is 36-40 cm; the pouring grid height of the bottom layer of the middle area position of the bottom plate is 26-30 cm, and if the pouring grid height of the bottom layer of the middle area position of the bottom plate is exceeded, the remaining height is the pouring grid height of the second layer of the middle area position of the bottom plate; the pouring grid height of the web area position is divided into layers by referring to the height of each layer, and the height of the top layer is controlled to be 28-30 cm; the pouring grid height of the flange plate area position on both sides is equal to the height of the flange plate area position on both sides; and the pouring grid height of the middle area position of the top plate is equal to the height of the middle area position of the top plate; the forward pouring area and the reverse pouring area are determined at the same time, the reverse pouring area is the pouring grid at the last end of each layer, and the forward pouring area is the other pouring grids; S2. Pouring of the chamfer area position on both sides of the bottom plate: synchronous and symmetrical layer-by-layer pouring is performed from one end pouring grid to the other end pouring grid on both sides of the prefabricated box girder formwork, one movable distributor and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outer side of each pouring area, and in each pouring area, the length of the movable distributor is adjusted, so that the movable distributor discharges uniformly from the front end to the rear end in the forward pouring area and uniformly from the rear end to the front end in the reverse pouring area; S3. Pouring of the middle area position of the bottom plate: synchronous and symmetrical layer-by-layer pouring is performed from one end to the other end on both sides of the prefabricated box girder formwork, one movable distributor and one belt conveyor combination device are arranged on each side of the prefabricated box girder formwork, n distributor positioning points are arranged on each side, corresponding to the outer side of each pouring area, and in each pouring area, the length of the movable distributor is adjusted, so that the movable distributor discharges uniformly from the front end to the rear end in the forward pouring area and uniformly from the rear end to the front end in the reverse pouring area; S4. Pouring of the web plate area position: Pouring grids from one end of the precast box girder formwork to the other end of the pouring grid uses horizontal layering, oblique sectioning, and synchronous symmetric pouring. Each side of the precast box girder formwork is provided with a mobile distributor and a belt conveyor combination device. n distributor positioning points are provided on each side, corresponding to the outside of each pouring area. In each pouring area, the cantilever length of the mobile distributor is adjusted to uniformly discharge from the front end to the rear end in the forward pouring area and uniformly discharge from the rear end to the front end in the reverse pouring area. After each horizontal layering pouring is completed, except for the pouring grid that has reached the top layer of the web plate area, the other preceding pouring grid is one layer higher than its adjacent following pouring grid. The pouring time of the two layers cannot exceed the initial setting time of the concrete. S5. Pouring of the flange plate area position on both sides: Each side of the precast box girder formwork is provided with a mobile distributor and a belt conveyor combination device. The combination device on one side is started to pour from one end of the pouring grid to the other end of the pouring grid. n distributor positioning points are provided on each side, corresponding to the outside of each pouring area. In each pouring area, the cantilever length of the mobile distributor is adjusted to uniformly discharge from the front end to the rear end in the forward pouring area and uniformly discharge from the rear end to the front end in the reverse pouring area. After pouring on one side is completed, the other side repeats the above steps to complete pouring. S6. Pouring of the top plate middle area position: One side of the precast box girder formwork is provided with a mobile distributor and a belt conveyor combination device. The combination device pours from one end of the pouring grid to the other end of the pouring grid. n distributor positioning points are provided on one side, corresponding to the outside of each pouring area. In each pouring area, the cantilever length of the mobile distributor is adjusted to align the mobile distributor with the center line of the beam width, uniformly discharge from the front end to the rear end in the forward pouring area, and uniformly discharge from the rear end to the front end in the reverse pouring area.

2. The continuous pouring method of the precast box girder according to claim 1, characterized in that: The mobile distributor is matched with a belt conveyor with adjustable conveying length for feeding, and is controlled by the concrete automatic pouring control system; The concrete automatic pouring control system control includes: a central processing unit; a measurement control module connected with the central processing unit; a measurement module connected with the measurement control module, including a concrete temperature measurement module and a formwork temperature measurement module, the concrete temperature measurement module including a first temperature sensor for measuring the temperature of the concrete initially entering the belt conveyor, and the formwork temperature measurement module including a second temperature sensor for measuring the temperature of the concrete flowing out of the discharge end of the mobile distributor; a data collection module connected with the measurement module and the central processing unit, for collecting data measured by the measurement module and feeding back to the central processing unit; an execution control module connected with the central processing unit; a concrete feeding control module connected with the execution control module and the belt conveyor, for controlling the feeding of the belt conveyor. A concrete pouring control module connected with the execution control module and the mobile distributor, used to control the opening and closing and speed of the mobile distributor; A vibrating control module connected with the execution control module and the attached vibrator arranged on the box girder form, used to control the opening and closing and frequency of the attached vibrator.

3. The continuous pouring method of the prefabricated box girder according to claim 1, characterized in that: The belt conveyor comprises: The fixed section of the frame comprises a fixed section support frame, a fixed section traveling mechanism and a fixed section belt conveying mechanism, a traveling channel is arranged inside the fixed section support frame along the conveying direction of the fixed section belt conveying mechanism, two rows of adjusting units are symmetrically and fixedly arranged on the inner side of the traveling channel, the fixed section traveling mechanism is connected to the bottom of the fixed section support frame, and the fixed section belt conveying mechanism is arranged on the top of the fixed section support frame; The movable section of the frame is slidably arranged in the traveling channel, comprises a movable section longitudinal beam, a movable section support column, a movable section traveling mechanism and a movable section belt conveying mechanism, two movable section longitudinal beams are symmetrically arranged and are arranged above the two rows of adjusting units along the conveying direction of the fixed section belt conveying mechanism and can match the movable section belt conveying mechanism, the movable section support column is connected to the lower front end of the movable section longitudinal beam, the movable section belt conveying mechanism can slide forward and backward relative to the adjusting units, the movable section traveling mechanism is connected to the bottom of the movable section support column, and the movable section belt conveying mechanism is arranged below the fixed section belt conveying mechanism.

4. The continuous pouring method of the prefabricated box girder according to claim 3, characterized in that: The fixed section support frame comprises a fixed section top longitudinal beam, a fixed section limiting longitudinal beam, a fixed section bottom longitudinal beam and a fixed section support column, two fixed section top longitudinal beams, two fixed section limiting longitudinal beams and two fixed section bottom longitudinal beams are symmetrically arranged, the fixed section top longitudinal beam, the fixed section limiting longitudinal beam and the fixed section bottom longitudinal beam on the same side are connected through the fixed section support column arranged at intervals, a limiting roller is rollingly connected to the inner side of the fixed section limiting longitudinal beam, the limiting roller is located between the fixed section belt conveying mechanism and the movable section belt conveying mechanism and can match the height position of the movable section belt conveying mechanism.

5. The continuous pouring method of the prefabricated box girder according to claim 3, characterized in that: The adjusting unit comprises a plurality of rollers and roller shafts arranged in matching with the rollers, one end of the roller shaft is fixedly connected to the inner side of the fixed section support frame, the other end is rotationally connected to the roller, the plurality of rollers are arranged in a horizontal straight line, the roller is provided with a groove on the side, and the groove can match the movable section longitudinal beam.

6. The continuous pouring method of the prefabricated box girder according to claim 5, characterized in that: The front end of the fixed section of the frame is provided with a telescopic driving mechanism, the telescopic driving mechanism is located behind the movable section support column and can drive at least one group of rollers to rotate to drive the movable section longitudinal beam to slide.

7. The continuous pouring method of the prefabricated box girder according to claim 6, characterized in that: The telescopic driving mechanism comprises a telescopic driving mechanism platform, a telescopic driving motor, a telescopic driving first reduction gear, a telescopic driving second reduction gear, a roller rotating shaft and a rotating shaft support column, the telescopic driving mechanism platform is fixed at the front end of the frame fixed section, the telescopic driving motor and the rotating shaft support column are fixed on the telescopic driving mechanism platform, the rotating shaft support column is arranged on both sides of the telescopic driving motor, the motor shaft of the telescopic driving motor is connected with the telescopic driving first reduction gear, the outer periphery of the roller rotating shaft is sleeved with the telescopic driving second reduction gear, both ends of the roller rotating shaft pass through the rotating shaft support column and are connected with one group of the rollers, and the telescopic driving second reduction gear is engaged with the telescopic driving first reduction gear. The remaining rollers are rotatably connected with one end of a roller support shaft, and the other end of the roller support shaft is connected with the fixed section support frame body.

8. The continuous pouring method of the prefabricated box girder according to claim 3, characterized in that: A limit sensor is arranged at the position of the movable section longitudinal beam close to the movable section support column, and the limit sensor is located behind the movable section support column.

9. The continuous pouring method of the prefabricated box girder according to claim 3, characterized in that: A concrete hopper is arranged above the feeding end of the fixed section belt conveying mechanism.

10. The continuous pouring method of the prefabricated box girder according to any one of claims 1-9, characterized in that: The mobile distributor comprises: a distributor frame; a distributor traveling mechanism fixed at the bottom of the distributor frame; a material collecting tank arranged in the distributor frame and internally provided with a concrete pump; a first concrete conveying pipe, the lower end of which is connected with the outlet of the concrete pump, and the upper end of which extends to the top of the distributor frame; a first rotating mechanism fixed at the top of the distributor frame; a first flange connecting mechanism fixedly connected at the top of the first rotating mechanism, driven to rotate by the first rotating mechanism, and provided with a through hole in the middle, which accommodates the upper end of the first concrete conveying pipe; a second concrete conveying pipe in the shape of an inverted U, one end of which extends into the through hole of the first flange connecting mechanism, and is in sealed communication with the upper end of the first concrete conveying pipe and can rotate relative to the first concrete conveying pipe; a first rotating arm, one end of which is fixedly connected with one side of the first flange connecting mechanism, and the top of which fixedly supports the second concrete conveying pipe; a second flange connecting mechanism, one side of which is fixedly connected with the other end of the first rotating arm; a second rotating mechanism, the top of which is fixedly connected with the bottom of the second flange connecting mechanism; a third flange connecting mechanism connected with the bottom of the second rotating mechanism, driven to rotate by the second rotating mechanism, and provided with a through hole in the middle, which accommodates the other end of the second concrete conveying pipe extending through the second flange connecting mechanism and the second rotating mechanism; a second rotating arm, one end of which is fixedly connected with one side of the third flange connecting mechanism. A third concrete delivery pipe, one end of which extends upwardly into the through hole of the third flange connecting mechanism, is in sealed communication with the other end of the second concrete delivery pipe and can rotate relative to the second concrete delivery pipe, the middle part of which extends along the direction of the second rotating arm and is fixedly supported by the second rotating arm, and the other end of which is used to extend to the position to be poured.

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