Ultra-high transition section precast capping beam formwork system, capping beam precasting method and installation method

Abstract

The present invention discloses a precast capping beam formwork system for a super-high transition section, a method for precasting a capping beam, and an installation method. The system includes side formworks and a bottom formwork. A structure form of clamping the bottom formwork with the side formworks is adopted between the side formworks and the bottom formwork. The bottom formwork includes a fixed bottom formwork and a movable bottom formwork which are connected left and right. The movable bottom formwork corresponds to the connection position between the bottom of the capping beam and the pier column, and its movable formwork can correspondingly adjust the inclination angle according to the change of the cross slope at the top of the capping beam, so that a wedge-shaped convex platform with an angle consistent with but opposite to the designed cross slope angle of the capping beam is formed at the connection position between the capping beam and the pier column. When the capping beam is connected to the pier column, the wedge-shaped convex platform is adjusted reversely to make the cross slope of the top surface of the capping beam consistent with the designed value, and the on-site assembly of the capping beam and the pier column is simple and fast. By adjusting the slope of the movable bottom formwork to form wedge-shaped convex platforms with different slopes at the bottom of the capping beam, the system can complete the precasting of capping beams with various cross slope angles. The fixed bottom formwork is designed according to the standard cross slope of the capping beam, so that the steel cage jig and the positioning tooling of the capping beam can be shared with the capping beam with the standard cross slope, reducing the construction cost.

Description

Technical Field

[0001] The present invention relates to a precast pier cap formwork, and particularly to a precast pier cap formwork system for a super-elevation transition section, as well as a pier cap precasting method and an installation method thereof. Background Art

[0002] At the present stage, the development of road and bridge construction in China is very rapid. In the past, the common bridge construction method was in-situ casting at the construction site. With the continuous development of cities, the construction of bridge components by in-situ casting in urban areas has been increasingly restricted by the surrounding environment requirements and construction conditions. Therefore, the fully precast production mode of bridge components has been more and more widely applied. The precast pier cap is a main precast component in the fully precast and assembled bridge. When designing a road, in order to offset the centrifugal force generated when a vehicle travels on a curved section, a single-sided cross slope needs to be set on the curved section. The transition section from the cross slope of the straight section to the cross slope of the curved section is the super-elevation transition section. The cross slope at the top of the precast pier cap in the super-elevation transition section gradually changes along with the road curve, and at the same time, the connection surface between the bottom of the precast pier cap and the pier column needs to be kept horizontal. The super-elevation transition section pier caps are divided into various types due to different cross slopes at the top, and there is only one pier cap with each non-standard cross slope even in the same super-elevation transition section or on the same road. Therefore, the formwork for the super-elevation transition section pier cap needs to match each cross slope of the pier cap. If formworks are separately processed for each cross slope of the pier cap, it will greatly increase the construction cost and occupy a large amount of formwork storage space, which does not meet the requirements of factory and batch precasting of bridge components. For precast pier caps with strict quality requirements, it is very difficult to ensure the quality of the finished products if low-cost simple formworks are used for precasting. Summary of the Invention

[0003] The purpose of the present invention is to provide a formwork system applicable to the precasting of pier caps with various cross slopes, as well as a pier cap precasting method and an installation method thereof.

[0004] The precast pier cap formwork system for the super-elevation transition section provided by the present invention includes side formworks and a bottom formwork. A structure form of clamping the bottom formwork by the side formworks is adopted between the side formworks and the bottom formwork. The bottom formwork includes a fixed bottom formwork and a movable bottom formwork which are connected left and right; the fixed bottom formwork is designed according to the standard cross slope of the pier cap; corresponding to the connection position between the bottom of the pier cap and the pier column, the movable formwork of the movable bottom formwork can adjust the inclination angle accordingly according to the change of the cross slope at the top of the pier cap.

[0005] In an implementation manner of the above technical solution, the fixed bottom formwork includes a fixed support and a fixed formwork connected to the upper end thereof.

[0006] In an embodiment of the above technical solution, the movable bottom formwork includes a fixed base, adjustable supports, adjustable sealing plates and the movable formwork. There is a vertical support platform at the tail of the fixed base. The movable formwork is located between the fixed formwork and the vertical support platform. The adjustable supports are hinged between the movable formwork and the fixed base. The left and right ends of the movable formwork can be rotatably hinged between the fixed formwork and the vertical support platform respectively. After the movable formwork rotates around the hinge at one end to adjust the inclination angle, the adjustable sealing plate is spliced at the height dislocation between the other end of the movable formwork and the corresponding structural member.

[0007] In an embodiment of the above technical solution, the rear end of the fixed formwork and one end of the movable formwork, and between the other end of the movable formwork and the front end of the vertical support platform are respectively hinged by ear plates and pin shafts.

[0008] In an embodiment of the above technical solution, the adjustable support is a hydraulic cylinder, an electric push rod or a telescopic screw rod.

[0009] In an embodiment of the above technical solution, both splicing sides of the adjustable sealing plate are inclined planes to ensure the fitting degree between it and the splicing surfaces of the movable formwork, the fixed formwork and the vertical support platform.

[0010] The method for prefabricating a standard cross-slope capping beam by the above system provided by the present invention includes the following steps:

[0011] (1) Keep each adjustable support at the same height as the vertical support platform so that the movable formwork remains horizontal.

[0012] (2) Hinge the two ends of the movable formwork to the fixed formwork and the vertical support platform respectively.

[0013] (3) Prefabricate and cure.

[0014] The method for prefabricating a super-elevation transition section capping beam by the above system provided by the present invention includes the following steps:

[0015] I. Prefabricate the left cross-slope capping beam

[0016] (1) Hinge one end of the movable formwork to the rear end of the fixed formwork, and the other end is not hinged to the front end of the vertical support platform.

[0017] (2) According to the slope adjustment requirements, adjust the adjustable support to make the movable formwork rotate around the hinge between it and the fixed formwork, and form a right cross-slope with the same angle but opposite direction as the cross-slope of the capping beam to be prefabricated, and then lock the adjustable support.

[0018] (3) Splice the adjustable sealing plate at the height dislocation formed between the movable formwork and the front end of the vertical support platform.

[0019] (4) Prefabricate and construct to form a wedge-shaped convex platform with a higher left and a lower right at the position corresponding to the connection of the pier column at the bottom of the capping beam, which is consistent with the cross slope design angle of the capping beam top surface but in the opposite direction, and the wedge-shaped convex platform protrudes from the bottom surface of the capping beam.

[0020] II. Prefabricated capping beam with right cross slope

[0021] (1) Hinge one end of the movable formwork to the front end of the vertical support platform, and the other end is not hinged to the rear end of the fixed formwork.

[0022] (2) According to the slope adjustment requirements, adjust the adjustable support to make the movable formwork rotate around the hinge between it and the fixed formwork, and form a left cross slope that is consistent with the cross slope angle of the capping beam to be prefabricated but in the opposite direction, and then lock the adjustable support.

[0023] (3) Splice an adjustable sealing plate at the height dislocation formed between the rear end of the movable formwork and the fixed formwork.

[0024] (4) Prefabricate and construct to form a wedge-shaped convex platform with a higher right and a lower left at the position corresponding to the connection of the pier column at the bottom of the capping beam, which is consistent with the cross slope design angle of the capping beam top surface but in the opposite direction, and the wedge-shaped convex platform protrudes from the bottom surface of the capping beam.

[0025] The installation method of the above-mentioned prefabricated capping beam on the pier column provided by the present invention includes the following steps:

[0026] (1) Place the wedge-shaped convex platform at the bottom of the cross slope capping beam on the top plane of the pier column.

[0027] (2) Adjust the capping beam to make the bottom surface of the wedge-shaped convex platform in a horizontal state, so that a cross slope consistent with the slope of the wedge-shaped convex platform but in the opposite direction is formed on the top surface of the capping beam.

[0028] Between the side formwork and the bottom formwork of the present invention, a structural form of the side formwork clamping the bottom formwork is adopted, and the bottom formwork is designed into two parts, namely a fixed bottom formwork and a movable bottom formwork. The fixed bottom formwork is designed according to the standard cross slope of the capping beam, while the movable bottom formwork corresponds to the connection position between the capping beam and the pier column. Its movable formwork can adjust the inclination angle accordingly according to the change of the cross slope at the top of the capping beam, so as to form a wedge-shaped convex platform with the same angle as the designed cross slope of the capping beam but in the opposite direction at the connection position between the capping beam and the pier column. When the capping beam is connected to the pier column, through the reverse adjustment function of the wedge-shaped convex platform, the cross slope of the top surface of the capping beam is made consistent with the designed value. The structural form of the side formwork clamping the bottom formwork can form wedge-shaped convex platforms with different slopes at the bottom of the capping beam by only adjusting the slope of the movable bottom formwork, so as to complete the prefabrication of capping beams with various cross slope angles through a set of formwork systems. The applicability of the formwork system is wide, and the turnover utilization rate of the formwork is high, greatly reducing the construction cost. Based on the capping beam with the standard cross slope, the prefabrication of capping beams with various cross slope angles is realized by forming a wedge-shaped convex platform at the connection position between the capping beam and the pier column. The reinforcement cage of the capping beam is also fabricated based on the reinforcement cage of the capping beam with the standard cross slope. The reinforcement cage jig and the positioning tooling can be shared with the capping beam with the standard cross slope. The fabrication of the reinforcement cage is simple and efficient, saving the construction cost. The prefabricated finished capping beams of the super-elevation transition section with different cross slopes are easy to distinguish and store, and the assembly process of the capping beam and the pier column at the construction site is simple and fast. This formwork system is simple to operate and convenient for construction, greatly reducing the formwork processing amount and the floor area, improving the construction efficiency, and well meeting the requirements of factory prefabrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention.

[0030] Figure 2 is Figure 1 an exploded schematic diagram of the bottom formwork in

[0031] Figure 3 It is a structural schematic diagram of the bottom formwork when the left cross slope capping beam is prefabricated by this system.

[0032] Figure 4 It is a structural schematic diagram of the bottom formwork when the right cross slope capping beam is prefabricated by this system.

[0033] Figure 5 It is a schematic diagram of the assembled state of the prefabricated capping beam and the pier column by this system.

[0034] Figure 6 It is an enlarged schematic diagram when the bottom of the prefabricated capping beam is assembled with the pier column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] As Figure 1 shown, the prefabricated capping beam formwork system for the super-elevation transition section disclosed in this embodiment includes a side formwork 1, a fixed bottom formwork 2 and a movable bottom formwork 3, adopting a structural form of the side formwork clamping the bottom formwork, and making the movable bottom formwork 3 correspond to the connection position between the capping beam and the pier column.

[0036] As shown Figure 2 in the figure, the fixed bottom formwork 2 includes a fixed support 22 and a fixed formwork 21 connected to the upper end thereof, and the fixed bottom formwork 2 is designed according to the standard cross slope of the capping beam.

[0037] The tail end of the fixed formwork 21 is provided with a double-ear plate SEB.

[0038] Combined Figure 1 with Figure 2 it can be seen that the movable bottom formwork 3 includes a movable formwork 31, a fixed base 32, a single-ear plate DEB, a double-ear plate SEB, adjustable supports 35, and an adjustable sealing plate 36.

[0039] The tail of the fixed base 32 has a vertical support platform, and the front end of the vertical support platform is provided with a double-ear plate SEB.

[0040] There are multiple groups of adjustable supports 35, which are symmetrically arranged in the front and rear rows and connected to the front of the corresponding vertical support platforms on the fixed base 32, and the lower ends of the adjustable supports 35 are hinged to the fixed base 32.

[0041] Single-ear plates DEB are respectively arranged at the left and right ends of the movable formwork 31, and the single-ear plates at both ends can be respectively matched with the double-ear plates SEB at the tail end of the fixed formwork 21 and the front end of the vertical support platform and are rotatably hinged through a pin shaft.

[0042] The upper ends of the adjustable supports 35 are respectively hinged to the front and rear sides of the movable formwork 21.

[0043] The adjustable supports 35 can be hydraulic cylinders or adjustable screws, preferably hydraulic cylinders.

[0044] The adjustable sealing plate 36 is installed at the gap formed between the movable formwork 31 and the fixed base 32 after the movable formwork 31 rotates around its hinge with the fixed formwork to adjust the slope, or is installed at the gap formed between the movable formwork 31 and the fixed formwork 21 after the movable formwork 31 rotates around its hinge with the vertical support platform to adjust the slope, and the width of the adjustable sealing plate 36 can be replaced according to the size of the gap.

[0045] As shown Figure 1 in the figure, when prefabricating the capping beam with a standard cross slope by this system, the fixed support 22 and the fixed base 32 are connected and fixed to the prefabrication site on the left and right, so that all the adjustable supports 35 are at the same height, and the movable formwork 31 is in a horizontal state at the same height as the vertical support platform at the tail of the fixed base 32. The two ends of the movable formwork 31 are respectively hinged to the fixed formwork 21 and the vertical support platform, and the capping beam is prefabricated and assembled according to the conventional process.

[0046] As shown Figure 3As shown in the figure, when the system is used for prefabricating a left - hand cross - slope capping beam, the hinge pin between the movable formwork 31 and the vertical support platform is removed, and the hinge at the tail end of the movable formwork 31 and the fixed formwork 21 is retained. The heights of the adjustable supports 35 are adjusted respectively to make the movable formwork 31 rotate to form a right - hand cross - slope that is consistent with the cross - slope angle of the capping beam to be prefabricated but in the opposite direction, and then the adjustable supports 35 are locked. Finally, an adjustable sealing plate 36 is installed at the gap formed between the right end of the movable formwork 31 and the vertical support platform.

[0047] To ensure the surface quality of the prefabricated capping beam, the two side edges in the length direction of the adjustable sealing plate 36 are respectively set as inclined planes, so that the adjustable sealing plate 36 can fit well with the splicing surface between the movable formwork 31 and the vertical support platform.

[0048] When the capping beam is prefabricated and formed, there is a wedge - shaped convex platform 4 with a left - high - right - low slope at the connection position with the pier column. The slope is consistent with the designed cross - slope angle of the capping beam top surface but in the opposite direction, and the wedge - shaped convex platform 4 protrudes from the bottom surface of the capping beam.

[0049] When the left - hand cross - slope capping beam is assembled and fixed to the pier column at the construction site, the wedge - shaped convex platform 4 at the bottom of the capping beam is placed on the top plane of the pier column, and the capping beam is adjusted so that the bottom surface of the wedge - shaped convex platform 4 is in a horizontal state. Due to the adjustment function of the wedge - shaped convex platform 4, a left - hand cross - slope that is consistent with the slope of the wedge - shaped convex platform 4 but in the opposite direction is formed on the top surface of the capping beam, and the construction operation is convenient and efficient.

[0050] As Figure 4 shown, when prefabricating a right - hand cross - slope capping beam, the hinge pin between the movable formwork and the fixed formwork is removed, and the pin between the movable formwork and the vertical support platform is installed. Referring to the method of prefabricating a left - hand cross - slope capping beam, when the capping beam is prefabricated and formed, there is a wedge - shaped convex platform 4 with a right - high - left - low slope at its bottom. The slope is consistent with the designed cross - slope angle of the capping beam top surface but in the opposite direction, and the wedge - shaped convex platform 4 protrudes from the bottom surface of the capping beam.

[0051] As Figure 5 、 Figure 6 shown, when the right - hand cross - slope capping beam is assembled and fixed to the pier column at the construction site, the wedge - shaped convex platform 4 at the bottom of the capping beam is placed on the top plane of the pier column, and the capping beam is adjusted so that the bottom surface of the wedge - shaped convex platform 4 is in a horizontal state. Due to the adjustment function of the wedge - shaped convex platform 4, a right - hand cross - slope that is consistent with the slope of the wedge - shaped convex platform 4 but in the opposite direction is formed on the top surface of the capping beam.

[0052] Since the capping beam formwork system of the present invention adopts a structure form of side form clamping the bottom form, when prefabricating capping beams with different cross - slopes, only the slope of the movable formwork 31 needs to be adjusted and changed, and the side form 1, the fixed bottom form 2 and the fixed base 32 remain in place without adjustment.

[0053] This formwork system has the following advantages:

[0054] 1. The system forms a wedge-shaped convex platform at the connection position between the capping beam and the pier column, with an angle consistent with the designed cross slope of the capping beam but in the opposite direction. Through the reverse adjustment of the wedge-shaped convex platform during the assembly of the capping beam and the pier column, the cross slope of the capping beam top surface is made consistent with the designed value. At the same time, the capping beam formwork system of this system adopts the structural form of side formwork clamping the bottom formwork, and can form wedge-shaped convex platforms with different slopes at the bottom of the capping beam by only adjusting the slope of the movable bottom formwork, so as to complete the prefabrication of capping beams with multiple cross slope angles through a set of formwork systems.

[0055] 2. The two ends of the movable formwork of this system are respectively connected to the fixed formwork and the fixed base by means of hinges, so that the movable formwork forms a standard slope or rotates around the pin shaft at one end to form a left or right slope. It can be used for the prefabrication of capping beams with standard cross slopes and capping beams with gradually changing cross slopes on the super-elevation transition section at the same time. The applicability of the formwork system is wide, and the turnover utilization rate of the formwork is high, which greatly reduces the construction cost.

[0056] 3. When prefabricating capping beams with different cross slopes by this system, only the slope of the movable formwork needs to be adjusted, and the structures of the side formwork and the fixed bottom formwork do not need to be changed. The operation during the construction process is convenient and fast, which greatly reduces the operation working hours and the labor intensity of workers.

[0057] 4. This system is based on the capping beam with a standard cross slope, and realizes the prefabrication of capping beams with multiple cross slope angles by forming a wedge-shaped convex platform at the connection position between the capping beam and the pier column. The capping beam reinforcement cage is also made based on the capping beam reinforcement cage with a standard cross slope. The reinforcement cage jigs and positioning tools can be shared with the capping beam with a standard cross slope. The production of the reinforcement cage is simple and efficient, saving the construction cost.

[0058] 5. The finished capping beams with different cross slopes prefabricated by this system are easy to distinguish and store, and the assembly process of the capping beam and the pier column at the construction site is simple and fast.

[0059] This capping beam formwork system is simple to operate and convenient for construction, greatly reducing the formwork processing volume and floor area, improving the construction efficiency, and well meeting the requirements of factory prefabrication.

Claims

1. A method for prefabricating a super-elevated transition section pier cap using a prefabricated pier cap formwork system for the super-elevated transition section, characterized in that: The precast capping beam formwork system for the super-elevated transition section includes side formwork and bottom formwork. The side formwork and the bottom formwork adopt a structural form where the side formwork clamps the bottom formwork. The bottom formwork includes a fixed bottom formwork and a movable bottom formwork that are connected left and right. The fixed bottom formwork is designed according to the standard cross slope of the capping beam. The movable bottom formwork corresponds to the connection position between the bottom of the capping beam and the pier column, and its movable formwork can adjust the inclination angle accordingly according to the change of the cross slope at the top of the capping beam. The fixed bottom formwork includes a fixed support and a fixed formwork connected to its upper end. The movable bottom formwork includes a fixed base, an adjustable support, an adjustable sealing plate, and the movable formwork. There is a vertical support platform at the tail of the fixed base. The movable formwork is located between the fixed formwork and the vertical support platform. The adjustable support is hinged between the movable formwork and the fixed base. The left and right ends of the movable formwork can be respectively rotatably hinged between the fixed formwork and the vertical support platform. After the movable formwork rotates around the hinge at one end to adjust the inclination angle, the adjustable sealing plate is spliced at the height misalignment between the other end of the movable formwork and the corresponding structural member. The method for precasting the super-elevated transition section capping beam includes the following steps: I. Precast the capping beam with a leftward cross slope (1) Hinge one end of the movable formwork to the rear end of the fixed formwork, and the other end is not hinged to the front end of the vertical support platform. (2) According to the slope adjustment requirement, adjust the adjustable support to make the movable formwork rotate around the hinge between it and the fixed formwork, and form a rightward cross slope that is the same as the cross slope angle of the capping beam to be precast but in the opposite direction, and then lock the adjustable support. (3) Splice the adjustable sealing plate at the height misalignment formed between the movable formwork and the front end of the vertical support platform. (4) During the precast construction, make a wedge-shaped convex platform with a left-high and right-low shape that is the same as the cross slope design angle of the capping beam top surface but in the opposite direction at the connection position between the bottom of the capping beam and the pier column, and the wedge-shaped convex platform protrudes from the bottom surface of the capping beam. II. Precast the capping beam with a rightward cross slope (1) Hinge one end of the movable formwork to the front end of the vertical support platform, and the other end is not hinged to the rear end of the fixed formwork. (2) According to the slope adjustment requirement, adjust the adjustable support to make the movable formwork rotate around the hinge between it and the fixed formwork, and form a leftward cross slope that is the same as the cross slope angle of the capping beam to be precast but in the opposite direction, and then lock the adjustable support. (3) Splice the adjustable sealing plate at the height misalignment formed between the movable formwork and the rear end of the fixed formwork. (4) During the precast construction, make a wedge-shaped convex platform with a right-high and left-low shape that is the same as the cross slope design angle of the capping beam top surface but in the opposite direction at the connection position between the bottom of the capping beam and the pier column, and the wedge-shaped convex platform protrudes from the bottom surface of the capping beam.

2. The method for prefabricating a super high transition section capping beam by using a prefabricated formwork system for a super high transition section capping beam according to claim 1, wherein: The rear end of the fixed formwork and one end of the movable formwork, and the other end of the movable formwork and the front end of the vertical support platform are respectively hinged through ear plates and pin shafts.

3. The method for prefabricating a super high transition section pier cap using the prefabricated formwork system for super high transition section pier caps as claimed in claim 1, wherein: The adjustable support is a hydraulic cylinder, an electric push rod, or a telescopic screw rod.

4. The method for prefabricating a super high transition section capping beam by using a prefabricated super high transition section capping beam formwork system according to claim 1, characterized in that: Both splicing sides of the adjustable sealing plate are inclined surfaces to ensure the fitting degree between it and the splicing surfaces of the movable formwork, the fixed formwork, and the vertical support platform.

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