Foldable prefabricated small box girder quick-release formwork

Abstract

The utility model relates to bridge engineering construction technical field especially relates to a collapsible prefabricated small box girder quick -detachable form, include: bottom form, side form, inner form and end form, end form is used to close the end of box girder, and side form is located bottom form both sides. Inner form is composed of left form and right form that are left -right symmetrical, and left form is composed of hinged left upper inner form and left lower inner form, and right form is composed of hinged right upper inner form and right lower inner form. The adjusting support mechanism for supporting and locking the unfolded angle is equipped on left form and right form. The connecting mechanism that can be quickly assembled and disassembled is equipped between the butt -joint edge of left upper inner form and right upper inner form and between the butt -joint edge of left lower inner form and right lower inner form. The utility model discloses through the hinged folding and quick -detachable design of inner form, realized the early whole dismantling of inner form and fast turnover, has improved construction efficiency greatly and reduced form material backlog cost.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering construction, in particular to a foldable quick-dismantling template for prefabricated small box girders. Background Art

[0002] For prefabricated small box girders used in bridge construction of supporting highway projects of pumped storage power stations, the construction speed and quality directly affect the construction of the main project of the pumped storage power station and the progress of heavy cargo transportation. In the prior art, prefabricated small box girders usually require a large number of templates, and the templates cannot be removed for reuse before the box girder concrete reaches the specified strength. The currently commonly used steel prefabricated box girder template system consists of a bottom template, side templates, end templates and an inner template. The template needs to have sufficient strength, rigidity and stability to ensure the accuracy of the dimensions of each part of the box girder and the position of embedded parts during construction, and to ensure that repeated use of the template does not affect the appearance quality of the girder body, which results in a large amount of steel being overstocked in the construction link for a long time.

[0003] At present, there are still a series of technical problems in the practical application of this type of prefabricated small box girder template system. For example: the existing steel templates have complicated operations and take a long time during installation and disassembly, making it difficult to achieve rapid turnover, resulting in low construction efficiency and affecting the overall construction progress of the supporting highway project of the pumped storage power station; the templates cannot be turned over during the curing period of box girder concrete, which causes a large amount of template materials to be retained on site, not only increasing material leasing and storage costs, but also limiting the turnover utilization rate of the templates; although traditional templates have necessary strength and rigidity, their modularization degree is low, the reassembly efficiency after disassembly is low and the precision is poor, which easily affects the dimensional accuracy and apparent quality of the girder body, especially deformation or surface damage is prone to occur after multiple uses; the templates occupy too much time in construction, which easily delays the implementation of subsequent processes and is difficult to meet the urgent requirements for construction schedule at key nodes such as the transportation of large equipment. Contents of the Utility Model

[0004] The problem to be solved by the utility model is to provide a foldable quick-dismantling template for prefabricated small box girders which is easy to operate, allows early formwork removal and greatly improves the turnover utilization rate, aiming at the above deficiencies. The technical solution is as follows: To solve the above technical problems, the technical solution proposed by the utility model is: a foldable quick-dismantling template for prefabricated small box girders, comprising a bottom template, side templates, an inner template and end templates, wherein the end templates are used for closing the ends of the box girder, and the side templates are located on both sides of the bottom template, characterized in that: The inner template is composed of a left template and a right template which are mutually mirror-symmetrical in structure; The left template is composed of an upper left inner template and a lower left inner template which are connected by hinge, the right template is composed of an upper right inner template and a lower right inner template which are connected by hinge, and the left template and the right template are provided with adjusting support mechanisms for supporting and locking the unfolding angle thereof; A quick-assembly and disassembly connection mechanism is provided between the mating edges of the upper left inner template and the upper right inner template, and between the mating edges of the lower left inner template and the lower right inner template.

[0005] In one embodiment, the adjusting support mechanism is a two-segment support plate, the two-segment support plate is provided with a plurality of connection holes, and the two-segment support plates are connected by bolts passing through the connection holes.

[0006] In one embodiment, the side template is an integral plate formwork structure including a flange plate and a side web plate, and the back of the plate formwork structure is provided with a stiffening frame.

[0007] In one embodiment, a tie rod is also included, which is used to connect and fix the side templates on both sides.

[0008] In one embodiment, the inner template is divided into multiple segments along its length, and the inner templates of adjacent segments are connected and fixed by fasteners through the connecting holes at their respective ends.

[0009] In one embodiment, the side template is divided into multiple segments along its length, and adjacent segments of the side template are connected and fixed by fasteners through the connection holes at the ends of their respective flange plates and side web plates.

[0010] In one embodiment, it further includes pressure rods, which are spaced apart on the top of the inner template, and the two ends of the pressure rods are engaged with the rigid frame of the side template.

[0011] In one embodiment, the quick-release connection mechanism is a connecting plate.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows: The hinged folding and clamping plate connection design of the inner formwork enables rapid overall demolding and removal, significantly improving the turnover efficiency of a single set of formwork; the adjustable two-section support plate locks the angle of the inner formwork, replacing the traditional full-span internal support, making operation simple and easy to assemble and disassemble; the side formwork adopts an integrated plate formwork and rigid frame structure, effectively solving the problems of numerous joints, easy grout leakage, and poor surface quality of assembled formwork; this formwork system allows for early removal of the inner formwork, greatly reducing the on-site accumulation of formwork materials, lowering storage and management costs, and creating conditions for the early commencement of subsequent processes, significantly shortening the overall construction cycle. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a foldable prefabricated small box girder quick-release template structure according to one embodiment.

[0015] Figure 2 This is a schematic diagram of the inner formwork structure of a foldable precast small box girder quick-release formwork according to one embodiment.

[0016] Figure 3 This is a schematic diagram of the removal of the inner formwork of a foldable precast small box girder quick-release formwork according to one embodiment.

[0017] Figure 4 This is a schematic diagram of the side formwork structure and inner formwork pressure bar of a foldable precast small box girder quick-release formwork according to one embodiment.

[0018] Figure 5 This is a schematic diagram of a foldable precast small box girder quick-release formwork lifting device according to one embodiment.

[0019] Reference numerals: 101: Upper left inner template; 102: Lower left inner template; 103: Upper right inner template; 104: Lower right inner template; 105: Two-section support plate; 106: Connecting plate; 107: Inner template connecting bolt hole; 108: Support plate connecting bolt; 201: Rigid frame; 202: Tie rod; 203: Flange plate; 204: Side web plate; 205: Side template connecting bolt hole; 206: Pressure bar; 301: Lifting tool main frame; 302: Lifting tool template hook. Detailed Implementation

[0020] To facilitate understanding of this utility model, the following description will be provided in more comprehensive and detailed manner with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0021] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0022] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0023] Please see Figure 1-5One embodiment of the foldable precast small box girder quick-release formwork mainly includes: a bottom formwork, side formwork, inner formwork, and end formwork. The end formwork is used to close the ends of the box girder, and the side formwork is located on both sides of the bottom formwork. The inner formwork consists of a left formwork and a right formwork that are structurally mirror-symmetrical. The left formwork consists of a hinged upper left inner formwork 101 and a lower left inner formwork 102, and the right formwork consists of a hinged upper right inner formwork 103 and a lower right inner formwork 104. Adjustable support mechanisms are also provided on the left and right formwork to support and lock their unfolded angle. Quick-release connection mechanisms are provided between the mating edges of the upper left inner formwork 101 and the upper right inner formwork 103, and between the mating edges of the lower left inner formwork 102 and the lower right inner formwork 104.

[0024] Specifically, the adjustable support mechanism consists of two-section support plates 105. The two-section support plates 105 are provided with multiple connection holes, and the two-section support plates 105 are connected by support plate connecting bolts 108 passing through the connection holes. This connection method can adjust the overall connection length of the two-section support plates 105 to achieve support for the inner template at different heights.

[0025] Specifically, the upper left inner template 101, lower left inner template 102, upper right inner template 103, and lower right inner template 104 are divided into multiple segments along the length direction. Adjacent segments are connected and fixed with fasteners through the connecting holes at their respective ends, thereby achieving length extension. In one specific embodiment, the connecting holes at the ends are inner mold connecting bolt holes 107, and the fasteners are bolts.

[0026] Specifically, the side formwork is an integral plate formwork structure including flange plate 203 and side web plate 204. The back of the plate formwork structure is provided with a stiffening frame 201 to enhance the overall rigidity and stability of the side formwork.

[0027] Furthermore, the side formwork is divided into multiple segments. Adjacent side formwork segments are connected and fixed with fasteners through the connection holes at the ends of their respective flange plates 203 and side web plates 204. This segmented design enhances the adaptability of the formwork to box girders of different lengths, facilitating transportation and turnover. In one specific embodiment, the connection holes on the flange plates 203 and side web plates 204 are side formwork connection bolt holes 205, and the fasteners are bolts. By fixing adjacent side formwork segments with bolts, a stable and detachable connection between each segment of the side formwork is achieved.

[0028] Specifically, it also includes tie rods 202, which connect and fix the side templates on both sides to ensure the overall stability of the template system.

[0029] Specifically, it also includes pressure bars 206, which are spaced apart at the top of the inner formwork. The two ends of the pressure bars 206 are engaged with the rigid frame 201 of the side formwork to prevent the inner formwork from floating during concrete pouring.

[0030] Specifically, the quick-release connection mechanism is the connection plate 106, which enables quick assembly and disassembly.

[0031] Specifically, it also includes a dedicated lifting device for the overall hoisting of the side formwork. The lifting device consists of a main frame 301 and formwork hooks 302. During hoisting, the formwork hooks 302 are attached to the rigid frame 201 on the outer edge of the side formwork, allowing the entire side formwork to be lifted off by a lifting device. This lifting device is a separate, detachable design, and does not interfere with formwork operations during pouring; it is only used during formwork removal.

[0032] The above-mentioned foldable precast small box girder quick-release formwork is used as follows: First, install the bottom formwork on the precast platform. Then, hoist the side formwork to both sides of the bottom formwork. Connect and fix the side formwork on both sides with tie rods 202 to ensure the overall stability of the formwork system. The side formwork adopts an integrated plate formwork structure including flange plates 203 and side web plates 204. The back of the plate formwork structure is provided with a stiffening frame 201. Each section of the side formwork is bolted together through the side formwork connecting bolt holes 205 on its side web plates 204 to form a continuous formwork surface. Then, hoist the inner formwork into the installed outer formwork cavity. Each section of the inner formwork is bolted together through the inner formwork connecting bolt holes 107 at its respective ends. Next, connect the two sections of support plates 105 by selecting different bolt holes to adjust their effective length and lock the angle of the inner formwork. Finally, tighten the bolts to fix it, so that the inner formwork forms a complete and stable box chamber structure. Finally, install the end formwork to complete the assembly of the entire formwork system. Before concrete pouring, several pressure bars 206 are installed at intervals. The ends of the pressure bars 206 are fixed to the rigid frame 201 of the side formwork via slots, forming a vertical constraint and effectively preventing the inner formwork from floating during concrete pouring. After the concrete pouring is completed and reaches basic forming strength, the formwork is dismantled in reverse order: first, the pressure bars 206 and end formwork are removed; then, the connecting bolts of the two-section support plates 105 are loosened, and the connecting plates 106 are removed, allowing the inner formwork to shrink as a whole. Finally, a winch is used to pull the shrunken inner formwork out of the box chamber. After releasing the tie rods 202, a special lifting tool is used. The lifting tool hooks 302 hook the rigid frame 201 of the outer edge of the side formwork, and the entire side formwork, including the flange plates 203 and the side web plates 204, is lifted off the platform as a whole using a lifting device. Because the side formwork is an integrated structure, this lifting method is efficient and quick. Finally, the side formwork removal operation is completed. After the box girder has cured on the pier and reached its full design strength, a large crane will be used to lift and transport the box girder away.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A foldable precast small box girder quick-release formwork, comprising a bottom formwork, side formwork, inner formwork, and end formwork, wherein the end formwork is used to close the ends of the box girder, and the side formwork is located on both sides of the bottom formwork, characterized in that: The inner template consists of a left template and a right template that are mirror images of each other; The left template is composed of a hinged upper left inner template and a hinged lower left inner template, and the right template is composed of a hinged upper right inner template and a hinged lower right inner template. The left and right templates are provided with an adjustment support mechanism for supporting and locking their unfolding angle. A quick-assembly and disassembly connection mechanism is provided between the mating edges of the upper left inner template and the upper right inner template, and between the mating edges of the lower left inner template and the lower right inner template.

2. The foldable precast small box girder quick-release formwork according to claim 1, characterized in that: The adjusting support mechanism consists of two-section support plates, each with multiple connection holes, and the two support plates are connected by bolts passing through the connection holes.

3. The foldable precast small box girder quick-release formwork according to claim 1, characterized in that: The side template is an integral plate formwork structure including a flange plate and a side web plate, and the back of the plate formwork structure is provided with a stiffening frame.

4. The foldable precast small box girder quick-release formwork according to claim 1, characterized in that: It also includes tie rods, which are used to connect and fix the side templates on both sides.

5. The foldable precast small box girder quick-release formwork according to claim 1, characterized in that: The inner template is divided into multiple segments along its length, and the inner templates of adjacent segments are connected and fixed with fasteners through the connecting holes at their respective ends.

6. The foldable precast small box girder quick-release formwork according to claim 3, characterized in that: The side template is divided into multiple segments along its length, and adjacent segments are connected and fixed by fasteners through the connection holes at the ends of their respective flange plates and side web plates.

7. The foldable precast small box girder quick-release formwork according to claim 1, characterized in that: It also includes pressure bars, which are spaced apart at the top of the inner template, and the two ends of the pressure bars are snapped onto the rigid frame of the side template.

8. The foldable precast small box girder quick-release formwork according to claim 1, characterized in that: The quick-release connection mechanism is a connecting plate.

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