A construction method for the variable cross-section structure of the superstructure of a secondary bridge in a bridge engineering project

Abstract

This invention provides a construction method for a variable cross-section structure of a secondary bridge in a bridge engineering project, belonging to the field of bridge construction technology. It includes the following steps: S1, measuring and laying out the contour curve of the variable cross-section structure on a plane, and bending, welding, and binding the reinforcing bars according to the drawn contour curve to form a reinforcing steel frame; S2, fabricating multiple sets of templates according to the variable cross-section structure, assembling the multiple sets of templates and fixing them together with fasteners to form a variable cross-section casting template; S3, after sealing and reinforcing the joints, placing the reinforcing steel frame into the cavity of the variable cross-section structure formed by the template using a casting device. This invention achieves control over the concrete flow rate and velocity by setting a closing component, avoiding concrete overflow from the casting template cavity and preventing waste. By setting a support component, the two ends of the reinforcing steel frame are pre-supported to ensure the casting and processing effect of the variable cross-section pre-constructed component.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a construction method for a variable cross-section structure of a secondary bridge in a bridge project. Background Technology

[0002] Bridges generally consist of a superstructure, a substructure, and ancillary structures. The superstructure mainly refers to the bridge span structure and bearing system; the substructure includes abutments, piers, and ground foundations. The construction of the bridge superstructure can be divided into various methods such as cast-in-place and precast beam assembly. Variable cross-section is a novel and high-performance bridge structure. Its cross-sectional dimensions gradually change along the bridge axis, thereby making the deformation of the bridge more reasonable when bearing loads, thus achieving the purpose of reducing deformation.

[0003] When constructing the superstructure of a bridge using precast beam segments, the beam segments need to be precast in a prefabrication yard. During the precasting process, a steel frame is typically placed inside the precast formwork and concrete is poured. When pouring concrete for the middle section of a variable cross-section structure, the total amount of concrete required and the pouring speed differ due to the dimensional differences 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 this invention is to provide a construction method for the variable cross-section structure of the superstructure of a secondary bridge in a bridge engineering project. This method addresses the problem that, in the existing construction of bridge superstructure using precast beam segments, beam segments need to be precast in a prefabrication yard. During the precasting of beam segments, a steel frame is generally placed in a precast template and concrete is poured. However, when pouring concrete for the middle section of the variable cross-section structure, the difference in dimensions between the middle and the two ends leads to differences in the total amount of concrete required and the pouring speed, thus necessitating adjustments to the concrete pouring speed.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A construction method for the variable cross-section superstructure of a secondary bridge in a bridge engineering project includes the following steps:

[0007] S1. Measure and lay out the outline curve of the variable cross-section structure on the plane, and bend, weld and tie the steel bars according to the outline curve to make a steel frame.

[0008] S2. Make multiple sets of templates according to the variable cross-section structure, put the multiple sets of templates together and fix them together with fasteners to form a variable cross-section casting template.

[0009] S3. After sealing and reinforcing the joints, the steel frame is placed into the variable cross-section structure cavity formed by the formwork using a pouring device, and concrete is poured into the cavity. After curing, the formwork is removed to form a variable cross-section precast concrete component.

[0010] The present invention also provides a technical solution in which the pouring device includes a mounting bracket, a walking mechanism mounted at the bottom of the mounting bracket, a control module mounted at the top of the mounting bracket, an electric push rod mounted on the inner wall of the top of the mounting bracket, a push plate mounted at the bottom of the electric push rod, an electric slide rail mounted on the inner wall of the push plate, a sliding base sleeved at the top of the electric slide rail, and two sets of sliding bases arranged on the top of the electric slide rail with the two sets of sliding bases on the same axis. A pouring pipe is sleeved at one end of the sliding base, a liquid level sensor is mounted on one side of the surface of the pouring pipe, a cylinder is mounted at the bottom of the sliding base, a collar is mounted at the bottom of the cylinder, and the inner wall of the collar is connected to the surface of the pouring pipe. The device also includes a triggering component, which is mounted on one side of the bottom of the sliding base and is used to trigger a closing component and a support component. The closing component is mounted on the bottom edge of the pouring pipe and is used to guide the concrete sprayed from the pouring pipe. The support component is mounted on the surface of the pouring pipe and is used to support the reinforcing steel frame.

[0011] Optionally, the triggering component includes a first liquid storage tank, a piston disc that slides against the inner wall of the first liquid storage tank, a push rod that is installed at the bottom of the piston disc, the push rod that is nested at the bottom of the first liquid storage tank, and one end of the push rod that is connected to a collar.

[0012] Optionally, the bottom of the first liquid storage tank is connected to a diversion valve through a flexible hose. The diversion valve is fixedly installed on one side of the outer surface of the casting pipe. The two ends of the diversion valve are connected to a second liquid storage tank through flexible hoses. The number of the second liquid storage tanks is set to two sets. Both sets of the second liquid storage tanks are installed on the outer surface of the casting pipe. A piston disc is slidably attached to the inner wall of the second liquid storage tank. A push rod is installed at the bottom of the piston disc.

[0013] Optionally, the closure assembly 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 rotating shafts is set to multiple sets, which 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 installed on one side of the baffle.

[0014] Optionally, the closing assembly further includes a limiting rod, which is fixedly installed on the surface of the casting pipe. A sliding ring is sleeved on the outer surface of the limiting rod, and the top end of the sliding ring is connected to the push rod.

[0015] Optionally, a rack is installed on the inner wall of the sliding ring, and the number of racks is set to multiple sets. The multiple sets of racks are arranged at equal angles on the inner wall of the sliding ring. The racks mesh with a spur gear. A rack 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. A second spur gear is installed on one side of the inner wall of the support frame. The second spur gear meshes with a second rack. One end of the second spur gear is connected to a first helical gear via a rotating rod.

[0017] Optionally, the support assembly further includes a support box, which is fixedly installed at the bottom of the support frame. A first geared disc is installed at the bottom of the inner wall of the support box, and a transmission rod is installed at the top of the first geared disc. The top of the transmission rod is connected to the bottom of the support frame. A second geared disc is sleeved on the outer surface of the transmission rod, and the second geared disc meshes with a first helical gear.

[0018] Optionally, a sliding seat is nested on the side of the support box, a support block is installed at one end of the sliding seat, a screw is threaded on the inner wall of the sliding seat, the screw is installed on the inner wall of the support box, and a helical gear II is installed at one end of the screw, which meshes with a gear disc I.

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

[0020] In the above scheme, by setting a triggering component, in conjunction with the oil conversion between the first and second liquid storage tanks, the oil volume difference between the first and second liquid storage tanks is used to trigger the closing component and the support component. The mechanism is simple and easy to maintain.

[0021] By setting up a closing component, the rotational cooperation between the rotating shaft, the flat gear, and the baffles achieves the closing effect of multiple sets of baffles at the bottom of the pouring pipe, blocking concrete falling from the bottom of the pouring pipe. Simultaneously, as concrete is poured into the pouring template cavity from bottom to top, the multiple sets of baffles gradually approach the bottom of the pouring pipe, controlling the concrete flow rate and velocity. This prevents concrete from overflowing the pouring template cavity due to excessive flow rate and velocity at the top, avoiding concrete waste and reducing material costs during concrete pouring. Furthermore, combined with the sliding effect of the electric slide rail and sliding base, the control of concrete flow rate and velocity through multiple sets of baffles during pouring allows for adaptive adjustments when pouring precast components with varying dimensions.

[0022] By setting up support components and utilizing the cooperation between sliding seats, screws, and support blocks, the two ends of the reinforcing steel frame are pre-supported when pouring at both ends of the casting template cavity. This prevents the reinforcing steel frame from shifting within the casting template cavity, which would affect the overall casting effect of the variable cross-section precast component. It also improves the cooperation accuracy between the casting template cavity and the reinforcing steel frame during casting, further ensuring the casting and processing effect of the variable cross-section precast component. Attached Figure Description

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

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

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of the casting device.

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

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

[0028] Figure 5 This is a schematic diagram of the structure of a closed component.

[0029] Figure 6 A schematic diagram of the structure of the rotating shaft, the first spur gear, the baffle, and the cutting edge;

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

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

[0032] Figure 9 for Figure 8 Enlarged diagram of A in the middle;

[0033] Figure 10 for Figure 8 Enlarged diagram of B in the diagram.

[0034] Figure label:

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

[0036] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0037] The following describes in detail, with reference to the accompanying drawings and specific embodiments, a construction method and application method for a variable cross-section superstructure of a secondary bridge provided by the present invention. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

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

[0039] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0040] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[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 a secondary bridge in a bridge engineering project, comprising the following steps:

[0042] S1. Measure and lay out the outline curve of the variable cross-section structure on the plane, and bend, weld and tie the steel bars according to the outline curve to make a steel frame.

[0043] S2. Make multiple sets of templates according to the variable cross-section structure, put the multiple sets of templates together and fix them together with fasteners to form a variable cross-section casting template.

[0044] S3. After sealing and reinforcing the joints, the steel frame is placed into the variable cross-section structure cavity formed by the formwork using a pouring device, and concrete is poured into the cavity. After curing, the formwork is removed to form a variable cross-section precast concrete component.

[0045] like Figures 1 to 10As shown, the pouring device includes a mounting bracket 1, a traveling mechanism 2 mounted at the bottom of the mounting bracket 1, a control module 3 mounted at the top of the mounting bracket 1, an electric push rod 4 mounted on the inner wall of the top of the mounting bracket 1, a push plate 40 mounted at the bottom of the electric push rod 4, an electric slide rail 41 mounted on the inner wall of the push plate 40, and a sliding base 5 sleeved on the top of the electric slide rail 41. Two sets of sliding bases 5 are arranged along the same axis at the top of the electric slide rail 41. A pouring pipe 6 is sleeved on one end of the sliding base 5, and a liquid level sensor 7 is mounted on one side of the surface of the pouring pipe 6. A cylinder 8 is installed at the bottom of the sliding base 5, and a collar 9 is installed at the bottom of the cylinder 8. The inner wall of the collar 9 is connected to the surface of the pouring pipe 6. It also includes a triggering component 10. A triggering component 10 is installed on one side of the bottom of the sliding base 5. The triggering component 10 is used to trigger the closing component 11 and the support component 12. The closing component 11 is installed on the bottom edge of the pouring pipe 6. The closing component 11 is used to guide the concrete sprayed from the pouring pipe 6. The support component 12 is installed on the surface of the pouring pipe 6. The support component 12 is used to support the steel frame.

[0046] By setting the trigger component 10, the oil volume difference between the first liquid storage tank 101 and the second liquid storage tank 105 is used to trigger the closing component 11 and the support component 12. The mechanism is simple and easy to maintain. By setting the closing component 11, the concrete flow rate and velocity can be controlled to avoid concrete overflowing into the pouring template cavity when the concrete flow rate and velocity are too large when pouring to the top of the pouring template cavity, thus avoiding concrete waste. By setting the support component 12, the two ends of the steel frame are pre-supported to ensure the pouring and processing effect of the variable cross-section precast component.

[0047] like Figure 3 and Figure 7 As shown, the triggering component 10 includes a first liquid storage tank 101. A piston disc 102 is slidably attached to the inner wall of the first liquid storage tank 101. A push rod 103 is installed at the bottom of the piston disc 102. The push rod 103 is nested at the bottom of the first liquid storage tank 101. One end of the push rod 103 is connected to the collar 9. A diversion valve 104 is connected to the bottom of the first liquid storage tank 101 through a hose. The diversion valve 104 is fixedly installed on one side of the outer surface of the casting pipe 6. A second liquid storage tank 105 is connected to both ends of the diversion valve 104 through hoses. The number of second liquid storage tanks 105 is set to two sets. Both sets of second liquid storage tanks 105 are installed on the outer surface of the casting pipe 6. A second piston disc 106 is slidably attached to the inner wall of the second liquid storage tank 105. A push rod 107 is installed at the bottom of the piston disc 106.

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

[0049] like Figures 4 to 7 As shown, the closing assembly 11 includes a mounting ring 111, which is fixedly mounted on the outer surface of the casting pipe 6. A rotating shaft 112 is nested on the side of the mounting ring 111. Multiple sets of rotating shafts 112 are arranged at equal angles on the side of the mounting ring 111. A flat gear 113 is fitted onto the outer surface of the rotating shaft 112. Baffles 114 are installed at both ends of the rotating shaft 112. A cutting edge 115 is fixedly installed on one side of each baffle 114. The closing assembly 11 also includes... It includes a limiting rod 116, which is fixedly installed on the surface of the casting pipe 6. A sliding ring 117 is sleeved on the outer surface of the limiting 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 sets. The multiple sets of racks 118 are arranged at equal angles on the inner wall of the sliding ring 117. The racks 118 mesh with the spur gear 113. A rack 2 119 is fixedly installed on the outer surface of the sliding ring 117.

[0050] By setting up the rotational cooperation between the rotating shaft 112, the flat gear 113, and the baffle 114, the multiple sets of baffles 114 achieve a closing effect at the bottom of the pouring pipe 6. Through the closure of the multiple sets of baffles 114, the concrete falling from the bottom of the pouring pipe 6 is blocked. At the same time, when pouring concrete into the pouring template cavity from bottom to top, the multiple sets of baffles 114 gradually approach the bottom of the pouring pipe 6, achieving the effect of controlling the concrete flow rate and velocity. This avoids the concrete overflowing into the pouring template cavity due to the large concrete flow rate and velocity when pouring to the top, thus avoiding concrete waste and reducing the material cost of concrete pouring. In addition, in conjunction with the sliding effect of the electric slide rail 41 and the sliding base 5, when the pouring pipe 6 is pouring into the pouring template cavity, the control effect of the multiple sets of baffles 114 on the concrete flow rate and velocity achieves adaptive adjustment when pouring precast members with different dimensions.

[0051] like Figures 8 to 10As shown, the support assembly 12 includes a support frame 121, which is fixedly installed on both sides of the mounting bracket 1. A second spur gear 122 is installed on one side of the inner wall of the support frame 121, and the second spur gear 122 meshes with a second rack 119. One end of the second spur gear 122 is connected to a first helical gear 124 through a rotating rod 123. The support assembly 12 also includes a support box 125, which is fixedly installed at the bottom of the support frame 121. A first geared disc 126 is installed at the bottom of the inner wall of the support box 125, and a transmission device is installed at the top of the first geared disc 126. The top end of the transmission rod 127 is connected to the bottom end of the support frame 121. A geared disc 128 is sleeved on the outer surface of the transmission rod 127. The geared disc 128 meshes with a helical gear 124. A sliding seat 129 is nested 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 threaded on the inner wall of the sliding seat 129. The screw 1211 is installed on the inner wall of the support box 125. A helical gear 1212 is installed at one end of the screw 1211. The helical gear 1212 meshes with a geared disc 126.

[0052] By setting up the cooperation between the sliding seat 129, the screw 1211 and the support block 1210, the two ends of the steel frame are pre-supported when pouring the two ends of the casting template cavity. This prevents the steel frame from shifting in the casting template cavity, which would affect the overall casting effect of the variable cross-section precast component. It also improves the cooperation accuracy between the casting template cavity and the steel frame during casting, and further ensures the casting and processing effect of the variable cross-section precast component.

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

[0054] The operator starts the control module 3, which in turn starts the walking mechanism 2. The walking mechanism 2 moves the installation bracket 1 to the top of the casting template. Then, the control module 3 starts the electric push rod 4, which pushes the push plate 40 to slide downwards. As the push plate 40 slides, it also drives the electric slide rail 41 and the sliding base 5 to slide downwards simultaneously. At the same time, the push plate 40 drives the steel frame to slide downwards through the support component 12 and enters the casting template cavity.

[0055] Subsequently, cylinder 8 pushes collar 9 to slide downwards. Collar 9 drives pouring pipe 6 into the bottom of the pouring template cavity. As collar 9 slides, push rod 103 slides downwards simultaneously. As push rod 103 slides, piston disc 102 slides and squeezes inside the cavity of first storage tank 101. Piston disc 102 squeezes the oil stored in first storage tank 101 through hose into diversion valve 104. Under the continuous squeezing action of piston disc 102, the oil is diverted through diversion valve 104 and enters two sets of second storage tanks 105 through hose. As oil continues to enter the second storage tanks 105, piston disc 206 slides inside the second storage tanks 105. As piston disc 206 slides, push rod 207 slides downwards.

[0056] As push rod 107 slides downward, it drives sliding ring 117 to slide downward along limit rod 116. As sliding ring 117 slides, it drives rack 118 to slide downward. As rack 118 slides, it meshes with spur gear 113, causing spur gear 113 to rotate. As spur gear 113 rotates, it drives multiple sets of rotating shafts 112 to rotate nested on the side of mounting ring 111. As multiple sets of rotating shafts 112 rotate, they drive multiple sets of baffles 114 away from the bottom of casting pipe 6.

[0057] When cylinder 8 pushes collar 9 downwards to its designated position, concrete enters the casting mold cavity through pouring pipe 6. Then, cylinder 8 drives collar 9 upwards, and as collar 9 drives pouring pipe 6 upwards, concrete continuously falls through pouring pipe 6 into the casting mold cavity. Simultaneously, liquid level sensor 7 on one side of pouring pipe 6 monitors the concrete level in the casting mold cavity in real time. As concrete continuously enters the casting mold cavity, cylinder 8 continues to drive collar 9 to slowly slide upwards, and as collar 9 slides, it drives push rod. Push rod 103 slides slowly, and while push rod 103 slides, it drives piston disc 102 to continuously and slowly draw oil into the first reservoir 101. Under the action of piston disc 102, the oil in the second reservoir 105 is drawn back into the first reservoir 101 through the hose and diverter valve 104. At the same time, piston disc 106 in the second reservoir 105 slides upward under the action of negative pressure. While piston disc 106 slides, it drives push rod 107 to slide upward synchronously along the direction of limit rod 116.

[0058] The sliding ring 117 drives the rack 118 to slide upward. While the rack 118 slides, it meshes with the spur gear 113, causing the spur gear 113 to rotate in the opposite direction. The spur gear 113 drives the rotating shaft 112 to rotate in the opposite direction, causing the multiple sets of baffles 114 to slowly approach the bottom of the pouring pipe 6 and block the concrete falling from the bottom of the pouring pipe 6. At the same time, when the concrete falls from the bottom of the pouring pipe 6, the concrete passes through and falls along the surface of the multiple sets of baffles 114. During this process, the cutting edges 115 on the surface of the multiple sets of baffles 114 cut the concrete passing through the surface of the baffles 114, preventing lumps in the concrete from directly entering the pouring formwork cavity.

[0059] When the concrete is poured to the top of both sides of the casting template cavity and reaches the required thickness, the control module 3 activates the electric slide rail 41, causing the sliding base 5 to slide along the electric slide rail 41 towards the center of the casting template cavity. Simultaneously, the sliding base 5 slides, driving the pouring pipe 6 to slide synchronously via the collar 9. At the same time, the sliding base 5 also drives the rack 119 to slide synchronously. As the rack 119 slides, it meshes with the spur gear 122, causing the spur gear 122 to rotate. Simultaneously, the rotation of the spur gear 122 drives the helical gear 124 to rotate synchronously via the rotating rod 123. 4. While rotating, the meshing gear disk 128 rotates. While the meshing gear disk 128 rotates, the meshing gear disk 126 rotates at the bottom of the inner wall of the support box 125 via the transmission rod 127. While the meshing gear disk 126 rotates, it meshes with the helical gear 1212. While the helical gear 1212 rotates, it drives the screw 1211 to rotate synchronously. Under the action of the rotation of the screw 1211, the sliding seat 129 threaded on the surface of the screw 1211 slides. While the sliding seat 129 slides nested on the side of the support box 125, it drives the support block 1210 at one end to disengage from the steel frame.

[0060] As the pouring pipe 6 slides along the sliding base 5 toward the center of the pouring template cavity, concrete continuously falls from the bottom of the pouring pipe 6, pouring concrete from both sides of the pouring template cavity toward the center of the pouring template cavity. The concrete level in the pouring template cavity is continuously monitored in real time by the liquid level sensor 7. When the thickness of the concrete in the pouring template cavity reaches the pouring standard, pouring is stopped. After the concrete has hardened and cured, the template is removed, completing the pouring of the variable cross-section concrete precast component.

[0061] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0062] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A construction method for the variable cross-section superstructure of a secondary bridge in a bridge engineering project, characterized in that, Includes the following steps: S1. Measure and lay out the outline curve of the variable cross-section structure on the plane, and bend, weld and tie the steel bars according to the outline curve to make a steel frame. S2. Make multiple sets of templates according to the variable cross-section structure, put the multiple sets of templates together and fix them together with fasteners to form a variable cross-section casting template. S3. After sealing and reinforcing the joint, the steel frame is placed into the variable cross-section structure cavity formed by the formwork using a pouring device, and concrete is poured into the cavity. After curing, the formwork is removed to form a variable cross-section concrete precast component. The pouring device includes a mounting bracket, an electric push rod is installed on the inner wall of the top of the mounting bracket, a push plate is installed at the bottom of the electric push rod, an electric slide rail is installed on the inner wall of the push plate, a sliding base is sleeved on the top of the electric slide rail, a pouring pipe is sleeved on one end of the sliding base, a cylinder is installed at the bottom of the sliding base, a collar is installed at the bottom of the cylinder, and the inner wall of the collar is connected to the surface of the pouring pipe. It also includes a triggering component. A triggering component is installed on one side of the bottom of the sliding base. The triggering component includes a first liquid storage tank. A piston disc is slidably attached to the inner wall of the first liquid storage tank. A push rod is installed at the bottom of the piston disc. A diversion valve is connected to the bottom of the first liquid storage tank through a hose. The diversion valve is fixedly installed on one side of the outer surface of the casting pipe. A second liquid storage tank is connected to both ends of the diversion valve through hoses. A piston disc 2 is slidably fitted to the inner wall of the second liquid storage tank, and a push rod 2 is installed at the bottom end of the piston disc 2; A closing assembly is installed at the bottom edge of the casting pipe. The closing assembly includes an installation ring. A rotating shaft is nested on the side of the installation ring. A flat gear is sleeved on the outer surface of the rotating shaft. Baffles are installed at both ends of the rotating shaft. The closing assembly also includes a limiting rod, a sliding ring is sleeved on the outer surface of the limiting rod, and a rack is installed on the inner wall of the sliding ring, the rack meshing with a spur gear. One end of the push rod is connected to the collar, and the top end of the sliding ring is connected to the push rod.

2. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering according to claim 1, characterized in that, A walking mechanism is installed at the bottom of the mounting bracket, and a control module is installed at the top of the mounting bracket. The number of sliding bases is set to two sets, and the two sets of sliding bases are arranged on the top of the electric slide rail with the same axis. A liquid level sensor is installed on one side of the surface of the pouring pipe. The triggering component is used to trigger the closing component and the support component. The closing component is used to guide the concrete sprayed from the pouring pipe. The support component is installed on the surface of the pouring pipe and is used to support the steel frame. The push rod is nested and installed at the bottom of the first liquid storage tank.

3. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering according to claim 1, characterized in that, The number of the second liquid storage tanks is set to two sets, and both sets of the second liquid storage tanks are installed on the outer surface of the pouring pipe.

4. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering according to claim 1, characterized in that, The mounting ring is fixedly installed on the outer surface of the casting pipe. The number of the rotating shafts is set to multiple sets, and the multiple sets of rotating shafts are arranged at equal angles on the side of the mounting ring. A cutting edge is fixedly installed on one side surface of the baffle.

5. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering according to claim 1, characterized in that, The limiting rod is fixedly installed on the surface of the casting pipe.

6. The construction method for the variable cross-section superstructure of a secondary bridge in a bridge engineering project according to claim 1, characterized in that, The number of racks is set to multiple sets, and the multiple sets of racks are arranged at equal angles on the inner wall of the sliding ring. Racks are fixedly installed on the outer surface of the sliding ring.

7. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering 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 second spur gear is installed on one side of the inner wall of the support frame. The second spur gear meshes with a second rack. One end of the second spur gear is connected to a first helical gear through a rotating rod.

8. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering according to claim 7, characterized in that, The support assembly also includes a support box, which is fixedly installed at the bottom of the support frame. A first geared disc is installed at the bottom of the inner wall of the support box, and a transmission rod is installed at the top of the first geared disc. The top of the transmission rod is connected to the bottom of the support frame. A second geared disc is sleeved on the outer surface of the transmission rod, and the second geared disc meshes with a first helical gear.

9. The construction method for the variable cross-section superstructure of a secondary bridge in bridge engineering according to claim 8, characterized in that, A sliding seat is nested on the side of the support box. A support block is installed at one end of the sliding seat. A screw is threaded onto the inner wall of the sliding seat. The screw is installed on the inner wall of the support box. A helical gear II is installed at one end of the screw. The helical gear II meshes with a gear disc.

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