Construction method for variable cross-section structure on upper portion of auxiliary bridge in bridge engineering

Abstract

The invention provides a construction method for an upper variable cross-section structure of an auxiliary bridge in bridge engineering, and belongs to the technical field of bridge construction. Comprising the following steps: S1, surveying and paying off on a plane to draw a profile curve of the variable cross-section structure, and bending, welding and bundling reinforcing steel bars according to the drawn profile curve to manufacture a reinforcing steel bar frame; s2, multiple sets of formworks are manufactured according to the variable cross-section structure, the multiple sets of formworks are assembled and fixedly connected through fasteners, and a variable cross-section pouring formwork is formed; and S3, after the joints are closed and reinforced, the steel bar frame is placed into a variable cross-section structure cavity formed by the formworks through a pouring device. By arranging the closing assembly, the effect of controlling the flow and the flow speed of concrete is achieved, waste caused by the fact that the concrete overflows out of a pouring formwork cavity is avoided, and by arranging the supporting assembly, the two ends of the steel bar frame are supported in advance in an auxiliary mode, and the pouring machining effect of the variable-cross-section prefabricated component is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method for a variable-section structure on the upper part of an auxiliary bridge of a bridge engineering. Background Art

[0002] A bridge is generally composed of a superstructure, a substructure and ancillary structures. The superstructure mainly refers to the bridge span structure and the support system; the substructure includes abutments, piers and ground foundations. The construction of the superstructure of the bridge can be divided into many methods such as cast-in-place and prefabricated beam segment assembly. Variable cross-section is a bridge structure with novel structure and excellent performance. Its cross-sectional dimensions gradually change along the axis of the bridge, so that the deformation of the bridge is more reasonable when it is under load, thereby achieving the purpose of reducing deformation.

[0003] When the bridge superstructure is constructed by assembling prefabricated beam segments, the beam segments need to be prefabricated in the prefabrication yard. When prefabricating the beam segments, it is generally necessary to place a steel frame in the prefabricated formwork and pour concrete. When pouring the middle part of the variable cross-section structure, the total amount of concrete required and the pouring speed are different due to the difference in size between the middle and both ends of the variable cross-section structure. Therefore, the concrete pouring speed needs to be adjusted. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a construction method for the variable cross-section structure of the upper part of the auxiliary bridge of a bridge project, so as to solve the problem that when the existing bridge upper structure is constructed by assembling prefabricated beam sections, the beam sections need to be prefabricated in a prefabrication yard, and when prefabricating the beam sections, a steel frame generally needs to be placed in the prefabricated formwork and concrete is poured. When pouring the middle part of the variable cross-section structure, due to the difference in size between the middle part and the two ends of the variable cross-section structure, the total amount of concrete required for pouring and the pouring speed are different, so the concrete pouring speed needs to be adjusted.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A construction method for a variable cross-section structure on the upper part of a bridge auxiliary bridge of a bridge engineering project comprises the following steps:

[0007] S1. Measure and lay out the lines on the plane to draw the contour curve of the variable cross-section structure, and bend, weld and bundle the steel bars according to the drawn contour curve to make a steel frame;

[0008] S2, making multiple sets of templates according to the variable cross-section structure, closing the multiple sets of templates and fixing and connecting them through fasteners to form a variable cross-section casting template;

[0009] S3. After the joints are sealed and reinforced, the steel frame is placed into the variable-section structure cavity formed by the template through a pouring device, and concrete is poured into the cavity. After curing, the template is removed to form a variable-section concrete precast part.

[0010] The present invention also provides a technical solution, the casting device comprises a mounting bracket, a walking mechanism is installed at the bottom end of the mounting bracket, a control module is installed at the top of the mounting bracket, an electric push rod is installed on the inner wall of the top end of the mounting bracket, a push plate is installed at the bottom end of the electric push rod, and an electric slide rail is installed on the inner wall of the push plate, and a sliding base is sleeved on the top end of the electric slide rail, and the number of the sliding base is set to two groups, and the two groups of the sliding base are arranged on the top end of the electric slide rail on the same axis. A casting pipe is sleeved on one end of the sliding base, and a liquid level sensor is installed on one side of the surface of the casting pipe, a cylinder is installed at the bottom end of the sliding base, a ring is installed at the bottom end of the cylinder, and the inner wall of the ring is connected with the surface of the casting pipe, and also includes a trigger assembly, a trigger assembly is installed on one side of the bottom end of the sliding base, and the trigger assembly is used to trigger a closing assembly and a supporting assembly; a closing assembly, a closing assembly is installed on the bottom edge of the casting pipe, and the closing assembly is used to divert concrete sprayed from the casting pipe; a supporting assembly, a supporting assembly is installed on the surface of the casting pipe, and the supporting assembly is used to support the steel frame.

[0011] Optionally, the trigger assembly includes a first liquid storage barrel, a piston disc 1 is slidably fitted on the inner wall of the first liquid storage barrel, a push rod 1 is installed on the bottom end of the piston disc 1, the push rod 1 is nested and installed at the bottom end of the first liquid storage barrel, and one end of the push rod 1 is connected to a ring.

[0012] Optionally, the bottom end of the first liquid storage barrel is connected to a diverter valve via a hose, and the diverter valve is fixedly installed on one side of the outer surface of the casting pipe. Both ends of the diverter valve are connected to a second liquid storage barrel via a hose. The number of the second liquid storage barrels is set to two groups, and the two groups of the second liquid storage barrels are installed on the outer surface of the casting pipe. The inner wall of the second liquid storage barrel is slidably fitted with a piston disk 2, and the bottom end of the piston disk 2 is installed with a push rod 2.

[0013] Optionally, the closing component includes a mounting ring, which is fixedly mounted on the outer surface of the casting tube, and a rotating shaft is nested on the side of the mounting ring. The number of the rotating shafts is set to multiple groups, and the multiple groups of rotating shafts are arranged at equal angles on the side of the mounting ring. A flat gear is sleeved on the outer surface of the rotating shaft, and baffles are installed at both ends of the rotating shaft, and a cutting edge is fixedly mounted on one side surface of the baffle.

[0014] Optionally, the closing assembly further comprises a limit rod, the limit rod is fixedly mounted on the surface of the casting pipe, a sliding ring is sleeved on the outer surface of the limit rod, and the top end of the sliding ring is connected to the push rod 2.

[0015] Optionally, a rack 1 is installed on the inner wall of the sliding ring, and the number of the rack 1 is set to multiple groups. The multiple groups of rack 1 are arranged at equal angles on the inner wall of the sliding ring. The rack 1 is meshed with a flat gear 1, and a rack 2 is fixedly installed on the outer surface of the sliding ring.

[0016] Optionally, the support assembly includes a support frame, which is fixedly installed on both sides of the push plate, and a flat gear 2 is installed on one side of the inner wall of the support frame. The flat gear 2 is meshed with rack 2, and one end of the flat gear 2 is connected to the bevel gear 1 through a rotating rod.

[0017] Optionally, the support assembly also includes a support box, which is fixedly mounted on the bottom of the support frame, a gear disk 1 is mounted on the bottom end of the inner wall of the support box, a transmission rod is mounted on the top of the gear disk 1, the top of the transmission rod is connected to the bottom end of the support frame, a gear disk 2 is sleeved on the outer surface of the transmission rod, and the gear disk 2 is meshed with the bevel gear 1.

[0018] Optionally, a sliding seat is nested on the side of the support box, a supporting block is installed at one end of the sliding seat, a screw is provided on the threaded sleeve on the inner wall of the sliding seat, the screw is installed on the inner wall of the support box, a bevel gear 2 is installed at one end of the screw, and the bevel gear 2 is meshed with the gear disk 1.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] In the above scheme, by setting a trigger component, cooperating with the oil conversion between the first liquid storage barrel and the second liquid storage barrel, and utilizing the oil volume difference between the first liquid storage barrel and the second liquid storage barrel, the closing component and the supporting component are triggered, and the structure is simple and easy to maintain.

[0021] By setting a closing component and utilizing the rotational cooperation among the rotating shaft, the flat gear and the baffle, a closing effect of multiple groups of baffles at the bottom end of the casting pipe is achieved, so as to achieve a blocking effect on the concrete dropped from the bottom end of the casting pipe. At the same time, when pouring concrete from bottom to top into the casting template cavity, multiple groups of baffles are gradually approached to the bottom end of the casting pipe, so as to achieve a control effect on the concrete flow and flow velocity, so as to avoid the concrete overflowing from the casting template cavity due to the large concrete flow and flow velocity when pouring to the top of the casting template cavity, so as to avoid concrete waste, thereby reducing the material cost during concrete pouring. At the same time, in conjunction with the sliding effect of the electric slide rail and the sliding base, when the casting pipe is pouring the casting template cavity, the concrete flow and flow velocity are controlled by multiple groups of baffles, so as to achieve adaptive adjustment during the pouring of variable-section prefabricated components with different size changes.

[0022] By setting up a support assembly and utilizing the cooperation between a sliding seat, a screw rod and a support block, it is possible to provide preliminary auxiliary support to both ends of the steel frame when pouring at both ends of the casting template cavity, thereby preventing the steel frame from offsetting in the casting template cavity and affecting the overall casting effect of the variable-section prefabricated component, improving the cooperation accuracy between the casting template cavity and the steel frame during pouring, and further ensuring the casting processing effect of the variable-section prefabricated component. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and to enable those skilled in the relevant art to make and use the invention.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the pouring device;

[0025] Figure 2 It is a schematic diagram of a partial cross-sectional structure of a pouring device;

[0026] Figure 3 It is a schematic diagram of the trigger component structure;

[0027] Figure 4 It is a schematic diagram of the closed component structure;

[0028] Figure 5 It is a schematic diagram of the structure of some components of the closed component;

[0029] Figure 6 It is a schematic diagram of the structure of the rotating shaft, flat gear 1, baffle and cutting edge;

[0030] Figure 7 It is a schematic diagram of the linkage structure between the trigger component and the closing component;

[0031] Figure 8 It is a schematic diagram of the supporting component structure;

[0032] Fig. 9 for Figure 8 A is an enlarged schematic diagram;

[0033] Fig.10 for Figure 8 A magnified schematic diagram of B.

[0034] Reference numerals:

[0035] 1. Mounting bracket; 2. Travel mechanism; 3. Control module; 4. Electric push rod; 40. Push plate; 41. Electric slide rail; 5. Sliding base; 6. Casting pipe; 7. Liquid level sensor; 8. Cylinder; 9. Ring; 10. Trigger assembly; 101. First liquid storage barrel; 102. Piston disc 1; 103. Push rod 1; 104. Diverter valve; 105. Second liquid storage barrel; 106. Piston disc 2; 107. Push rod 2; 11. Closing assembly; 111. Mounting ring; 112. Rotating shaft; 1 13. Flat gear one; 114. Baffle; 115. Cutting edge; 116. Limit rod; 117. Sliding ring; 118. Rack one; 119. Rack two; 12. Support assembly; 121. Support frame; 122. Flat gear two; 123. Rotating rod; 124. Bevel gear one; 125. Support box; 126. Gear disk one; 127. Transmission rod; 128. Gear disk two; 129. Sliding seat; 1210. Support block; 1211. Screw rod; 1212. Bevel gear two.

[0036] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0037] The following is a detailed description of a construction method and a method of using a variable cross-section structure of the upper part of a bridge auxiliary bridge provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternative methods to implement some known technologies; and the accompanying drawings are only for a more specific description of the embodiments, and are not intended to specifically limit the present invention.

[0038] In general, a term can be understood, at least in part, from its use in context. For example, depending, at least in part, on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending, at least in part, on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0039] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0040] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0041] like Figures 1 to 10 As shown, an embodiment of the present invention provides a construction method for a variable cross-section structure of an auxiliary bridge of a bridge engineering, comprising the following steps:

[0042] S1. Measure and lay out the lines on the plane to draw the contour curve of the variable cross-section structure, and bend, weld and bundle the steel bars according to the drawn contour curve to make a steel frame;

[0043] S2, making multiple sets of templates according to the variable cross-section structure, closing the multiple sets of templates and fixing and connecting them through fasteners to form a variable cross-section casting template;

[0044] S3. After the joints are sealed and reinforced, the steel frame is placed into the variable-section structure cavity formed by the template through a pouring device, and concrete is poured into the cavity. After curing, the template is removed to form a variable-section concrete precast part.

[0045] like Figures 1 to 10As shown, the pouring device includes a mounting bracket 1, a walking mechanism 2 is installed at the bottom of the mounting bracket 1, a control module 3 is installed at the top of the mounting bracket 1, an electric push rod 4 is installed on the inner wall of the top of the mounting bracket 1, a push plate 40 is installed at the bottom of the electric push rod 4, an electric slide rail 41 is installed on the inner wall of the push plate 40, a sliding base 5 is sleeved on the top of the electric slide rail 41, the number of the sliding bases 5 is set to two groups, the two groups of sliding bases 5 are arranged on the same axis at the top of the electric slide rail 41, one end of the sliding base 5 is sleeved with a pouring pipe 6, and a liquid level sensor 7 is installed on one side of the surface of the pouring pipe 6 A cylinder 8 is installed at the bottom end of the sliding base 5, a collar 9 is installed at the bottom end of the cylinder 8, the inner wall of the collar 9 is connected to the surface of the casting pipe 6, and also includes a trigger component 10. A trigger component 10 is installed on one side of the bottom end of the sliding base 5, and the trigger component 10 is used to trigger the closing component 11 and the supporting component 12; the closing component 11 is installed at the bottom edge of the casting pipe 6, and the closing component 11 is used to divert the concrete sprayed out of the casting pipe 6; the supporting component 12 is installed on the surface of the casting pipe 6, and the supporting component 12 is used to support the steel frame.

[0046] By setting the trigger component 10 and utilizing the oil volume difference between the first liquid storage barrel 101 and the second liquid storage barrel 105, the closing component 11 and the supporting component 12 are triggered. The structure is simple and easy to maintain. By setting the closing component 11, the control effect of the concrete flow rate and flow velocity is achieved to avoid the concrete overflowing from the casting template cavity due to the large concrete flow rate and flow velocity when pouring to the top of the casting template cavity, thereby avoiding concrete waste. By setting the supporting component 12, the two ends of the steel frame are pre-supported to ensure the casting processing effect of the variable-section prefabricated component.

[0047] like Figure 3 and Figure 7 As shown, the trigger assembly 10 includes a first liquid storage barrel 101, a piston disc 102 is slidably fitted on the inner wall of the first liquid storage barrel 101, a push rod 103 is installed at the bottom of the piston disc 102, the push rod 103 is nested and installed at the bottom of the first liquid storage barrel 101, one end of the push rod 103 is connected to the ring 9, the bottom of the first liquid storage barrel 101 is connected with a diverter valve 104 through a hose, the diverter valve 104 is fixedly installed on one side of the outer surface of the casting pipe 6, and the two ends of the diverter valve 104 are connected with a second liquid storage barrel 105 through a hose, the number of the second liquid storage barrels 105 is set to two groups, the two groups of second liquid storage barrels 105 are installed on the outer surface of the casting pipe 6, the inner wall of the second liquid storage barrel 105 is slidably fitted with a piston disc 106, and a push rod 107 is installed at the bottom of the piston disc 106.

[0048] By setting up oil conversion between the first liquid storage barrel 101 and the second liquid storage barrel 105 and utilizing the oil volume difference between the first liquid storage barrel 101 and the second liquid storage barrel 105, the closing component 11 and the supporting component 12 are triggered, and the mechanism is simple and easy to maintain.

[0049] like Figures 4 to 7 As shown, the closing component 11 includes a mounting ring 111, which is fixedly mounted on the outer surface of the pouring pipe 6, and a rotating shaft 112 is nested on the side of the mounting ring 111. The number of the rotating shafts 112 is set to multiple groups, and the multiple groups of rotating shafts 112 are arranged at equal angles on the side of the mounting ring 111. A flat gear 113 is sleeved on the outer surface of the rotating shaft 112, and baffles 114 are installed at both ends of the rotating shaft 112. A cutting edge 115 is fixedly mounted on one side of the baffle 114. The closing component 11 also includes A limit rod 116 is included, which is fixedly installed on the surface of the casting pipe 6. A sliding ring 117 is sleeved on the outer surface of the limit rod 116. The top of the sliding ring 117 is connected to the push rod 107. A rack 118 is installed on the inner wall of the sliding ring 117. The number of racks 118 is set to multiple groups. The multiple groups of racks 118 are arranged at equal angles on the inner wall of the sliding ring 117. The rack 118 is meshed with the flat gear 113. A rack 2 119 is fixedly installed on the outer surface of the sliding ring 117.

[0050] By setting the rotational cooperation among the rotating shaft 112, the flat gear 113 and the baffle 114, the closing effect of the multiple groups of baffles 114 at the bottom end of the casting tube 6 is achieved. Through the closing between the multiple groups of baffles 114, the concrete falling from the bottom end of the casting tube 6 is blocked. At the same time, when pouring concrete into the casting template cavity from bottom to top, the multiple groups of baffles 114 gradually approach the bottom end of the casting tube 6, so as to achieve the control effect of the concrete flow and flow rate, so as to avoid the concrete overflowing from the casting template cavity due to the large concrete flow and flow rate when pouring to the top of the casting template cavity, so as to avoid concrete waste, thereby reducing the material cost during concrete pouring. At the same time, with the sliding effect of the electric slide rail 41 and the sliding base 5, when the casting tube 6 pours the casting template cavity, the control effect of the concrete flow and flow rate by the multiple groups of baffles 114 is achieved, so as to achieve adaptive adjustment during the casting of variable-section prefabricated components with different size changes.

[0051] like Figures 8 to 10As shown, the support assembly 12 includes a support frame 121, the support frame 121 is fixedly mounted on both sides of the mounting bracket 1, a flat gear 122 is mounted on one side of the inner wall of the support frame 121, the flat gear 122 is meshed with the rack 119, one end of the flat gear 122 is connected to a bevel gear 124 through a rotating rod 123, and the support assembly 12 also includes a support box 125, the support box 125 is fixedly mounted on the bottom of the support frame 121, a toothed disc 126 is mounted on the bottom end of the inner wall of the support box 125, and a transmission disc 126 is mounted on the top of the toothed disc 126. Rod 127, the top of the transmission rod 127 is connected to the bottom of the support frame 121, the outer surface of the transmission rod 127 is sleeved with a gear plate 128, the gear plate 128 is meshed with the bevel gear 124, a sliding seat 129 is nested and installed on the side of the support box 125, a support block 1210 is installed at one end of the sliding seat 129, a screw 1211 is threadedly sleeved on the inner wall of the sliding seat 129, the screw 1211 is installed on the inner wall of the support box 125, a bevel gear 1212 is installed at one end of the screw 1211, and the bevel gear 1212 is meshed with the gear plate 126.

[0052] By setting the cooperation between the sliding seat 129, the screw 1211 and the supporting block 1210, it is possible to provide preliminary auxiliary support to the two ends of the steel frame when pouring at both ends of the casting template cavity, thereby preventing the steel frame from offsetting in the casting template cavity and affecting the overall casting effect of the variable-section prefabricated component, improving the cooperation accuracy between the casting template cavity and the steel frame during pouring, and further ensuring the casting processing effect of the variable-section prefabricated component.

[0053] The working principle of the technical solution provided by the present invention is as follows:

[0054] The operator starts the control module 3, and the control module 3 starts the walking mechanism 2. The walking mechanism 2 drives the mounting bracket 1 to move as a whole to the top of the casting template. Then the control module 3 starts the electric push rod 4, and the electric push rod 4 pushes the push plate 40 to slide downward. When the push plate 40 slides, it drives the electric slide rail 41 and the sliding base 5 to slide downward synchronously. At the same time, the push plate 40 drives the steel frame to slide downward through the support assembly 12 and enters the casting template cavity;

[0055] Then, the cylinder 8 pushes the collar 9 to slide downward, and the collar 9 drives the pouring tube 6 to enter the bottom of the pouring template cavity. While the collar 9 slides, it drives the push rod 103 to slide downward synchronously. While the push rod 103 slides, it drives the piston disc 102 to slide and squeeze in the internal cavity of the first liquid storage barrel 101. The piston disc 102 squeezes the oil stored in the first liquid storage barrel 101 into the diverter valve 104 through the hose. Under the continuous squeezing action of the piston disc 102, the oil is diverted through the diverter valve 104 and enters the two groups of second liquid storage barrels 105 through the hose. After the oil continues to enter the second liquid storage barrel 105, it drives the piston disc 2 106 to slide in the second liquid storage barrel 105. While the piston disc 2 106 slides, it drives the push rod 2 107 to slide downward.

[0056] When the push rod 107 slides downward, it drives the sliding ring 117 to slide downward along the direction of the limit rod 116. When the sliding ring 117 slides, it drives the rack 118 to slide downward. When the rack 118 slides, it engages with the flat gear 113, so that the flat gear 113 rotates. When the flat gear 113 rotates, it drives multiple sets of rotating shafts 112 to rotate in the side of the mounting ring 111. When the multiple sets of rotating shafts 112 rotate, they drive multiple sets of baffles 114 away from the bottom end of the pouring pipe 6.

[0057] When the cylinder 8 pushes the collar 9 to slide downward into place, the concrete enters the casting template cavity through the casting tube 6, and then the cylinder 8 drives the collar 9 to slide upward. While the collar 9 drives the casting tube 6 to slide upward, the concrete continues to fall into the casting template cavity through the casting tube 6. At the same time, the liquid level sensor 7 on one side of the casting tube 6 monitors the concrete liquid level in the casting template cavity in real time. As the concrete continues to enter the casting template cavity, the cylinder 8 continues to drive the collar 9 to slide slowly upward, and the collar 9 slides while driving the push rod The first push rod 103 slides slowly, and the push rod 103 slides while driving the piston disc 102 to continue to slowly suck in the first liquid storage barrel 101. Under the action of the piston disc 102, the oil in the second liquid storage barrel 105 is re-sucked into the first liquid storage barrel 101 through the hose and the diverter valve 104. At the same time, the piston disc 2 106 in the second liquid storage barrel 105 slides upward in the second liquid storage barrel 105 under the action of negative pressure. The piston disc 2 106 slides while driving the push rod 2 107 to slide upward synchronously along the direction of the limit rod 116;

[0058] The sliding ring 117 drives the rack 118 to slide upward, and the rack 118 engages with the flat gear 113 while sliding, so that the flat gear 113 rotates in the opposite direction, and the flat gear 113 drives the rotating shaft 112 to rotate in the opposite direction, so that the multiple groups of baffles 114 slowly approach the bottom end of the pouring pipe 6, and block the concrete falling from the bottom end of the pouring pipe 6. At the same time, when the concrete falls from the bottom end of the pouring pipe 6, the concrete passes through and falls along the surface of the multiple groups of baffles 114. In this process, the cutting edges 115 on the surface of the multiple groups of baffles 114 cut the concrete passing through the surface of the baffles 114, so as to prevent the lumps in the concrete from directly entering the casting template cavity;

[0059] When concrete is poured to the top of both sides of the casting template cavity and reaches the required thickness of pouring, the control module 3 starts the electric slide rail 41 to make the sliding base 5 slide along the electric slide rail 41 toward the middle of the casting template cavity. When the sliding base 5 slides, it drives the casting pipe 6 to slide synchronously through the sleeve ring 9. At the same time, when the sliding base 5 slides, it drives the rack 2 119 to slide synchronously. When the rack 2 119 slides, it meshes with the flat gear 2 122, so that the flat gear 2 122 rotates. When the flat gear 2 122 rotates, it drives the bevel gear 1 124 to rotate synchronously through the rotating rod 123. The bevel gear 12 4 rotates while engaging the second gear plate 128 to rotate, while the second gear plate 128 rotates, the gear plate 126 is driven to rotate at the bottom end of the inner wall of the support box 125 through the transmission rod 127, while the gear plate 126 rotates, the second bevel gear 1212 is engaged to rotate, while the bevel gear 1212 rotates, the screw rod 1211 is driven to rotate synchronously, under the rotation of the screw rod 1211, the sliding seat 129 threadedly sleeved on the surface of the screw rod 1211 slides, and the sliding seat 129 is nested and slid on the side of the support box 125, while driving the support block 1210 at one end to be out of contact with the steel frame;

[0060] When the pouring tube 6 follows the sliding base 5 to slide toward the middle of the casting template cavity, concrete continues to fall from the bottom of the pouring tube 6, and concrete is poured from both sides of the casting template cavity to the middle of the casting template cavity. The concrete liquid level in the casting template cavity is continuously monitored in real time through the liquid level sensor 7. When the concrete thickness in the casting template cavity reaches the pouring standard, the pouring is stopped and after the concrete is hardened and cured, the template is removed to complete the pouring of the variable-section concrete precast parts.

[0061] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0062] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A construction method for a variable cross-section structure on the upper part of a secondary bridge of a bridge project, characterized in that: The steps include: S1. Measure and lay out the lines on the plane to draw the contour curve of the variable cross-section structure, and bend, weld and bundle the steel bars according to the drawn contour curve to make a steel frame; S2, making multiple sets of templates according to the variable cross-section structure, closing the multiple sets of templates and fixing and connecting them through fasteners to form a variable cross-section casting template; S3. After the joints are sealed and reinforced, the steel frame is placed into the variable-section structure cavity formed by the template through a pouring device, and concrete is poured into the cavity. After curing, the template is removed to form a variable-section concrete precast part.

2. A casting device applied to the construction method of the variable cross-section structure on the auxiliary bridge of the bridge engineering according to claim 1, characterized in that: The pouring device comprises a mounting bracket, a walking mechanism is mounted on the bottom end of the mounting bracket, a control module is mounted on the top end of the mounting bracket, an electric push rod is mounted on the inner wall of the top end of the mounting bracket, a push plate is mounted on the bottom end of the electric push rod, an electric slide rail is mounted on the inner wall of the push plate, a sliding base is sleeved on the top end of the electric slide rail, the number of the sliding bases is set to two groups, the two groups of sliding bases are arranged on the top end of the electric slide rail in the same axis, a casting pipe is sleeved on one end of the sliding base, a liquid level sensor is mounted on one side of the surface of the casting pipe, a cylinder is mounted on the bottom end of the sliding base, a collar is mounted on the bottom end of the cylinder, and the inner wall of the collar is connected to the surface of the casting pipe; It also includes a trigger assembly, which is installed on one side of the bottom end of the sliding base and is used to trigger the closing assembly and the supporting assembly; A closing component is installed at the bottom edge of the pouring pipe, and the closing component is used to guide the concrete sprayed out of the pouring pipe; A support assembly is installed on the surface of the casting pipe, and the support assembly is used to support the steel bar frame.

3. The pouring device according to claim 2, characterized in that: The trigger assembly includes a first liquid storage barrel, a piston disc 1 is slidably fitted on the inner wall of the first liquid storage barrel, a push rod 1 is installed at the bottom end of the piston disc 1, the push rod 1 is nested and installed at the bottom end of the first liquid storage barrel, and one end of the push rod 1 is connected to a ring.

4. The pouring device according to claim 3, characterized in that: The bottom end of the first liquid storage barrel is connected with a diverter valve through a hose, and the diverter valve is fixedly installed on one side of the outer surface of the casting pipe. Both ends of the diverter valve are connected with the second liquid storage barrel through a hose. The number of the second liquid storage barrels is set to two groups, and the two groups of the second liquid storage barrels are installed on the outer surface of the casting pipe. The inner wall of the second liquid storage barrel is slidably fitted with a piston disk 2, and the bottom end of the piston disk 2 is installed with a push rod 2.

5. The pouring device according to claim 2, characterized in that: The closing component includes a mounting ring, which is fixedly mounted on the outer surface of the casting pipe. A rotating shaft is nested on the side of the mounting ring. The number of the rotating shafts is set to multiple groups, and the multiple groups of rotating shafts are arranged at equal angles on the side of the mounting ring. A flat gear is sleeved on the outer surface of the rotating shaft. Baffles are installed at both ends of the rotating shaft, and a cutting edge is fixedly mounted on one side surface of the baffle.

6. The pouring device according to claim 2, characterized in that: The closing assembly also includes a limit rod, which is fixedly mounted on the surface of the casting pipe. A sliding ring is sleeved on the outer surface of the limit rod, and the top end of the sliding ring is connected to the second push rod.

7. The pouring device according to claim 6, characterized in that: A rack 1 is installed on the inner wall of the sliding ring. The number of the racks 1 is set to multiple groups. The multiple groups of racks 1 are arranged at equal angles on the inner wall of the sliding ring. The rack 1 is meshed with a flat gear 1. A rack 2 is fixedly installed on the outer surface of the sliding ring.

8. The pouring device according to claim 2, characterized in that: The support assembly includes a support frame, which is fixedly installed on both sides of the push plate. A flat gear 2 is installed on one side of the inner wall of the support frame. The flat gear 2 is meshed with a rack 2, and one end of the flat gear 2 is connected to a bevel gear 1 through a rotating rod.

9. The pouring device according to claim 2, characterized in that: The support assembly also includes a support box, which is fixedly installed at the bottom of the support frame. A gear disk 1 is installed at the bottom end of the inner wall of the support box, and a transmission rod is installed at the top end of the gear disk 1. The top end of the transmission rod is connected to the bottom end of the support frame. A gear disk 2 is sleeved on the outer surface of the transmission rod, and the gear disk 2 is meshed with the bevel gear 1.

10. The pouring device according to claim 9, characterized in that: A sliding seat is nested and installed on the side of the support box, a supporting block is installed at one end of the sliding seat, a screw is provided on the threaded sleeve on the inner wall of the sliding seat, the screw is installed on the inner wall of the support box, a bevel gear 2 is installed on one end of the screw, and the bevel gear 2 is meshed with the gear disk 1.

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