Cast-in-place bridge deck slab bottom die supporting system and construction method thereof

Abstract

The invention relates to the technical field of bridge engineering, and particularly discloses a cast-in-place bridge deck slab bottom die supporting system and a construction method thereof, the cast-in-place bridge deck slab bottom die supporting system is used for an open type steel beam-concrete bridge, a triangular bracket is adopted for constructing a bridge deck slab wing plate of the open type steel beam-concrete bridge, and a lifting lug steel plate is welded to the included angle between a steel channel beam upper flange plate and a steel channel beam web. The triangular bracket is hung on a lifting lug steel plate through a bolt, the bracket bottom support is transversely installed at the bottom of the triangular bracket, and the bottom fulcrum of the triangular bracket is vertically supported on a steel beam web through the bottom support to bear transverse supporting force, so that compared with a traditional triangular bracket, the mounting and dismounting progress can be accelerated, and the gradient of the triangular bracket is convenient to adjust; according to the technical scheme, adverse effects on the appearance of the web of the steel channel beam can be reduced, meanwhile, the torsion resistance of the upper flange plate of the steel channel beam is enhanced through the lifting lug steel plate, further, the center joint bottom die structure is in a pocket hanging mode, the bottom die is not detached, site construction is easy, slurry leakage is avoided, a large number of support materials and labor cost are saved, and the adverse effects on under-bridge traffic caused by formwork installation and detachment are eliminated.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering, and in particular to a cast-in-place bridge deck bottom formwork support system and a construction method thereof. Background Art

[0002] The bridge deck construction of "open steel beam-concrete bridge" has two methods: prefabricated bridge deck and integral cast-in-place. Integral cast-in-place bridge deck can eliminate the construction joint of bridge deck concrete, and the structural integrity and durability are more advantageous. For cast-in-place bridge deck, the bridge deck bottom formwork system is usually supported on the steel channel beam structure, in which the bridge deck wing plate is constructed by installing a triangular bracket on the web of the steel channel beam. After the steel channel beam is installed in place, the prepared triangular bracket is welded to the web of the steel channel beam. The triangular bracket is fixed up and down, and then the distribution beam is laid on the bracket crossbeam, and then the wing plate bottom formwork is laid on the distribution beam. After the bridge deck concrete is completed, the wing plate bottom formwork, distribution beam and triangular bracket are removed with the help of crane and trolley. The bridge deck in the steel channel beam groove adopts the construction of full-height brackets in the steel channel. The full-height brackets are set up according to the spatial size of the steel channel. The small steel or rough wooden squares of the main ribs are installed on the bracket top support, and the secondary wooden squares are laid on the main ribs, and the plywood formwork is laid on the wooden squares. After the concrete of the bridge deck is completed, the personnel enter the steel channel from the reserved skylight to remove the bottom form, wooden squares, and full-height brackets. For the "open-type steel beam-concrete bridge" with multiple steel beams, the central connecting belt is usually constructed with a hanging formwork. A supporting bench higher than the concrete of the bridge deck is erected on the flange plate of the steel channel beam, and then a shoulder beam is horizontally placed on the bench. The bottom form of the central connecting belt is firmly folded under the flange plate through the shoulder beam with a hanging rod. When pouring concrete, a small hole is reserved at the appropriate position of the bridge deck, and the steel wire rope with the bottom form tied in advance is pulled from the small hole to the bridge deck. After the bridge deck is completed, the bottom form is removed using the small hole, and the bottom form of the wing plate is lowered to the ground using the steel wire rope.

[0003] The above construction technology still has some limitations:

[0004] Fixing the triangular bracket on the web of the steel channel beam above and below, especially welding on the web of the steel channel beam, is labor-intensive and requires a lot of work. It is also inconvenient to adjust the slope of the bracket. The central connecting belt of the "open-type steel beam-concrete bridge" with multiple steel beams is constructed with a hanging formwork. Due to safety requirements, it is necessary to install the wing plate bottom formwork first and then tie the steel bars. The shoulder beam and hanger installed first seriously affect the installation progress of the bridge deck steel bars. At the same time, the hanging formwork is complicated to construct, requires a lot of materials and labor, and removing the bottom formwork has a great impact on the traffic under the bridge.

[0005] The object of the present invention is to provide a cast-in-place bridge deck bottom formwork support system and a construction method thereof to solve the problems mentioned in the above background technology. Summary of the invention

[0006] To achieve the above-mentioned purpose, the present invention provides a cast-in-place bridge deck bottom formwork support system for an open steel beam-concrete bridge, comprising a steel channel beam structure, a wing plate bottom formwork system, a center seam bottom formwork structure, and a steel channel inner formwork system;

[0007] The steel channel beam structure includes a steel channel beam bottom plate, a steel channel beam web plate, and a steel channel beam upper flange plate. A plurality of steel channel beam web plates are distributed on the steel channel beam bottom plate. A steel channel beam upper flange plate is welded to the top of the steel channel beam web plate. A plurality of studs are evenly distributed on the top of the steel channel beam upper flange plate. The flange plate bottom formwork system is arranged on the steel channel beam web plates arranged at both ends of the steel channel beam bottom plate, and is detachably connected to the steel channel beam web plates.

[0008] The wing plate bottom formwork system includes a wing plate bottom formwork, multiple distribution beams, a lug steel plate, and a triangular bracket. A lug steel plate is welded at the angle between the top of the steel channel beam web and the upper flange plate of the steel channel beam. One side of the top of the triangular bracket is detachably connected to the lug steel plate. The bottom end of the triangular bracket is connected to the steel channel beam web through a bracket bottom bracket. Multiple distribution beam arrays are distributed at the top of the triangular bracket. The wing plate bottom formwork is installed on the top of the multiple distribution beams and connected to the ends of the adjacent upper flange plates of the steel channel beam.

[0009] The center seam bottom formwork structure is installed between two steel channel beam structures. The bottom of each center seam bottom formwork structure is supported by the formwork system in the steel channel. The center seam bottom formwork structure includes a center seam bottom formwork rib plate, a center seam bottom formwork panel, and a hook. Support bars are welded at the ends of the upper flange plates of the steel channel beam, and the two ends of the center seam bottom formwork structure are supported by the support bars. A plurality of center seam bottom formwork rib plates are welded at the bottom of the center seam bottom formwork panel, and the lap length of the end of the center seam bottom formwork panel and the support bar is reserved at both ends of the center seam bottom formwork rib plate. A plurality of hooks for lifting are provided on the top of the center seam bottom formwork panel.

[0010] As a further improvement of the present invention, the triangular bracket includes an oblique rod, a vertical rod, and a horizontal beam. One end of the horizontal beam is fixedly connected to the top of the vertical rod. The oblique rod is arranged between the angles between the horizontal rod and the vertical rod to form a triangle. The vertical rod is parallel to the web of the steel channel beam. The end of the horizontal rod near the vertical rod is detachably connected to the ear steel plate. The bottom end of the vertical rod is movably connected to the bracket bottom support, and the bracket bottom support is vertically connected to the web of the steel channel beam.

[0011] As a further improvement of the present invention, the bracket base includes a screw rod, a support nut, and an anti-fall nut. The vertical rod is composed of two oppositely arranged channel steels. A Φ48 short steel pipe is welded between the bottoms of the two channel steels. The screw rod is installed through the inner hole of the Φ48 short steel pipe. The support nut is threadedly connected to the screw rod and is used to limit the triangular bracket. The anti-fall nut is arranged on the side opposite to the support nut to prevent the base support from falling.

[0012] As a further improvement of the present invention, the cross beam is provided with a slot for connecting with the ear steel plate, and bolt holes are opened at the slots. After the slots on the cross beam are connected with the ear steel plate, they are connected and fixed by hinged bolts passing through the bolt holes. A railing socket is also provided at the end of the cross bar away from the ear steel plate.

[0013] As a further improvement of the present invention, a groove is reserved at one end of the support bar connected to the upper flange plate of the steel channel beam for overlapping the center seam bottom formwork panel. After the center seam bottom formwork panel overlaps the top surface of the support bar, its top surface is flush with the top surface of the upper flange plate of the steel channel beam, and the center seam bottom formwork panel is welded and fixed to the upper flange plate of the steel channel beam.

[0014] As a further improvement of the present invention, the formwork system in the steel trough includes multiple vertical poles, connecting rods, adjustable top supports, and adjustable bottom supports. The multiple vertical poles are connected by connecting rods. An adjustable top support is installed on the top of each vertical pole, and the main ribs of the bottom formwork are installed on the adjustable top support. Wooden squares are laid on the main ribs, and plywood formwork is laid on the wooden squares. The wooden formwork is connected to the upper flange plate of the steel trough beam, and the bottom of each vertical pole is connected to the bottom plate of the steel trough beam through an adjustable bottom support.

[0015] A construction method for a cast-in-place bridge deck bottom formwork support system comprises the following steps:

[0016] a. All triangular brackets, lug steel plates and support bars are prefabricated in the factory and welded with the web plate of the steel channel beam and the upper flange plate of the steel channel beam in the factory and then transported to the construction site;

[0017] b. Installation of steel channel beam structures: First, multiple steel channel beam structures are installed on the bridge piers according to the design requirements, and then the steel channel beam bottom plates are installed to form multiple center seam cells in sequence;

[0018] c. Install the wing plate bottom formwork system. Insert the slot at the end of the triangular bracket crossbar into the hanging ear steel plate and then fix them with hinged bolts. The bottom of the vertical rod of the triangular bracket is supported by the bracket bottom bracket and the outer wall of the steel channel beam web. Then install the distribution beam on the crossbar of the triangular bracket, and then install the wing plate bottom formwork on the distribution beam. The end of the crossbar away from the hanging ear steel plate is also provided with a railing socket. The wing plate bottom formwork also serves as an anti-collision guardrail and anti-falling platform.

[0019] d. Installation of the center seam bottom formwork structure: First, determine the length of the center seam bottom formwork panel according to the width between each center seam grid compartment, then weld the center seam bottom formwork rib plate at the bottom of the center seam bottom formwork panel to form a whole center seam bottom formwork, and then use a crane to hoist the center seam bottom formwork to the center seam grid compartment, one by one, and the two ends of the center seam bottom formwork panel in the center seam bottom formwork structure are seated on the support bars at the end of the upper flange plate of the steel channel beam and fixed by spot welding;

[0020] e. Installation of the formwork system in the steel channel. First, determine the length of the full-floor support pole according to the height of each steel channel. Then install an adjustable bottom bracket with adjustable height on the bottom plate of the steel channel beam. Install the poles on the adjustable bottom bracket. The distance between the poles should match the standard crossbar. Install an adjustable top bracket on the top of the pole. Install the main rib of the bottom formwork on the adjustable top bracket. Lay wooden squares on the main ribs. Lay plywood formwork on the wooden squares. The wooden formwork is flush with the upper flange plate of the steel channel beam.

[0021] f. After the bottom formwork system is completed, the bridge deck reinforced concrete construction is carried out;

[0022] g. After the bridge deck is completed, the wing plate bottom formwork system is removed, and the formwork system in the steel trough is removed according to the usual process. The personnel enter the steel trough from the reserved hole, knock the adjustable top support loose to release the force on the full-height bracket, and then pull out the wooden square and wooden formwork, and then remove the main rib and the full-height bracket in the steel trough;

[0023] h. After the construction of the anti-collision guardrail is completed, the bridge deck wing bottom template system is dismantled. First, the concrete and debris on the wing bottom template are cleaned up, and then the support nuts of the bracket bottom are loosened with the help of inspection trolleys, aerial platforms and other working platforms, so that the triangular bracket rotates a certain angle with the hinge bolts, so that the wing bottom template is emptied, and the wing bottom templates are pulled out piece by piece and stacked on the bridge deck, and then the distribution beams are dismantled one by one, and then the triangular bracket is gently lifted by the hoisting tool, and the hinge bolts are removed, and the triangular bracket is immediately separated from the lifting lug steel plate;

[0024] i. The center seam bottom formwork structure will not be removed after the bridge deck construction is completed.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention adopts a triangular bracket to construct the bridge deck wing plate of an "open steel beam-concrete" bridge, welds a lug steel plate at the angle between the flange plate on the steel channel beam and the web plate of the steel channel beam, hangs the triangular bracket on the lug steel plate by bolts, and transversely installs a bracket bottom support at the bottom of the triangular bracket to vertically support the web plate of the steel channel beam. The bottom fulcrum of the triangular bracket is transversely supported on the web plate of the steel beam through the bracket bottom support to bear the lateral supporting force. The construction process is simple and the force calculation is clear. Compared with the traditional triangular bracket, the installation and removal progress can be accelerated, the slope of the triangular bracket can be conveniently adjusted, and the adverse effect on the appearance of the web plate of the steel channel beam can be reduced. At the same time, the lug steel plate strengthens the torsional resistance of the flange plate on the steel channel beam. Furthermore, the center seam bottom formwork structure adopts a pocket-hanging type without removing the bottom formwork, which is simple to construct on site and does not leak slurry, saves a large amount of bracket materials and labor costs, greatly reduces the construction risk, and eliminates the adverse effect of installing and removing the formwork on the traffic under the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the bridge deck and bottom formwork support system of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the bottom membrane system of the present invention;

[0029] Figure 3 It is a schematic diagram of the center seam bottom mold structure of the present invention.

[0030] In the figure: 100, web plate of steel channel beam; 101, upper flange plate of steel channel beam; 11, triangular bracket; 111, diagonal rod; 112, vertical rod; 113, cross beam; 12, wing plate bottom formwork; 13, distribution beam; 14, lifting ear; 15, hinge bolt; 16, bracket bottom support; 165, Φ48 short steel pipe; 166, anti-fall nut; 167, support nut; 17, railing socket; 21, center seam bottom formwork structure; 211, center seam bottom formwork panel; 212, center seam bottom formwork rib plate; 213, hook; 22, support bar; 3, formwork system inside steel channel. DETAILED DESCRIPTION

[0031] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] Embodiment 1:

[0035] See also Figure 1-3 , the present invention provides a cast-in-place bridge deck bottom formwork support system for an open steel beam-concrete bridge, including a steel channel beam structure, a wing plate bottom formwork system, a center seam bottom formwork structure 21, and a steel channel inner formwork system 3;

[0036] The steel channel beam structure includes a steel channel beam bottom plate, a steel channel beam web plate 100, and a steel channel beam upper flange plate 101. A plurality of steel channel beam web plates 100 are distributed on the steel channel beam bottom plate. The top of the steel channel beam web plate 100 is welded with a steel channel beam upper flange plate 101. A plurality of studs are evenly distributed on the top of the steel channel beam upper flange plate 101. The flange plate bottom formwork system is arranged on the steel channel beam web plates 100 arranged at both ends of the steel channel beam bottom plate, and is detachably connected to the steel channel beam web plates 100.

[0037] The flange bottom template system includes a flange bottom template 12, a plurality of distribution beams 13, a lifting lug 14 steel plate, and a triangular bracket 11. A lifting lug 14 steel plate is welded at the angle between the top of the steel channel beam web 100 and the upper flange plate 101 of the steel channel beam. One side of the top of the triangular bracket 11 is detachably connected to the lifting lug 14 steel plate. The bottom end of the triangular bracket 11 is connected to the steel channel beam web 100 through a bracket bottom bracket 16. A plurality of distribution beams 13 are distributed in an array at the top of the triangular bracket 11. The flange bottom template 12 is installed on the top of the plurality of distribution beams 13 and connected to the ends of the adjacent upper flange plates 101 of the steel channel beam.

[0038] The center seam bottom formwork structure 21 is installed between two steel channel beam structures. The bottom of each center seam bottom formwork structure 21 is supported by the steel channel inner formwork system 3. The center seam bottom formwork structure 21 includes a center seam bottom formwork rib plate 212, a center seam bottom formwork panel 211, and a hook 213. The end of the steel channel beam upper flange plate 101 is welded with a support bar 22, and the two ends of the center seam bottom formwork structure 21 are supported by the support bar 22. A plurality of center seam bottom formwork rib plates 212 are welded to the bottom of the center seam bottom formwork panel 211, and the two ends of the center seam bottom formwork rib plates 212 leave a lap length between the end of the center seam bottom formwork panel 211 and the support bar 22. A plurality of hooks 213 for lifting are provided on the top of the center seam bottom formwork panel 211.

[0039] In this embodiment, a wall-mounted triangular bracket 11 is used to construct the bridge deck wing plate bottom template 12 of an open steel beam-concrete bridge, a lug 14 steel plate is welded at the angle between the upper flange plate 101 of the steel channel beam and the web plate 100 of the steel channel beam, a bolt hole is opened in the lug 14 steel plate and a bolt is installed to hang the triangular bracket 11 on the lug 14 steel plate, a bracket bottom bracket 16 is installed horizontally at the bottom of the triangular bracket 11 to vertically support the web plate 100 of the steel channel beam, one end of the triangular bracket 11 is hinged, and the bottom fulcrum is horizontally supported on the web plate of the steel beam through the bracket bottom bracket 16 to bear the lateral support force, which belongs to a wall-mounted triangular bracket, and the construction process is simple. Simple, the force calculation is clear and straightforward. Furthermore, the center seam bottom formwork structure 21 adopts a hanging type without dismantling the bottom formwork to construct the central connecting belt bridge deck of the multi-box steel-concrete composite beam bridge. The center seam bottom formwork is processed with a thin steel plate referring to the size of the central connecting belt. One formwork corresponds to one center seam grid. A 3-5cm wide and 10mm thick flat steel support bar 22 is welded at the end of the flange plate 101 on the steel channel beam. The support bar 22 can directly hold the center seam bottom formwork structure 21. After the bridge deck is cast, the center seam bottom formwork is not dismantled. The center seam bottom formwork structure 21 is easy to install, does not leak slurry, is convenient for the steel bar binding of the bridge deck, speeds up the construction progress, and minimizes the impact on the traffic under the bridge.

[0040] Embodiment 2:

[0041] See also Figure 1-2The triangular bracket 11 includes an oblique rod 111, a vertical rod 112, and a cross beam 113. One end of the cross beam 113 is fixedly connected to the top of the vertical rod 112. The oblique rod 111 is arranged between the angles between the cross rod and the vertical rod 112 to form a triangle. The vertical rod 112 is parallel to the web 100 of the steel channel beam. The end of the cross rod near the vertical rod 112 is detachably connected to the steel plate of the lifting ear 14. The bottom end of the vertical rod 112 is movably connected to the bracket bottom support 16, and the bracket bottom support 16 is vertically connected to the web 100 of the steel channel beam.

[0042] The crossbeam 113 is provided with slots for plugging into the steel plates of the lifting ears 14, and bolt holes are opened at the slots. After the slots on the crossbeam 113 are plugged into the steel plates of the lifting ears 14, they are connected and fixed by means of hinge bolts 15 passing through the bolt holes. A railing socket 17 is also provided at the end of the crossbar away from the steel plates of the lifting ears 14. The crossbeam 113 is composed of two channel steels arranged back to back. The two channel steels are welded to the vertical rod 112, and the distance between the two channel steels is 1 mm wider than the thickness of the steel plates of the lifting ears 14, which is convenient for plugging into the steel plates of the lifting ears 14. The crossbeam 113 is provided with slots for plugging into the steel plates of the lifting ears 14, and the slot here is the distance between the two steel channels.

[0043] When in use, after the slot at the end of the cross bar of the triangular bracket 11 is plugged into the ear 14 steel plate on the web 100 of the steel channel beam, it is connected and fixed by the hinge bolt 15, and the bracket bottom support 16 is connected to the outer wall of the web 100 of the steel channel beam at the bottom of the vertical rod 112 for support. Not only can the triangular bracket be quickly installed and disassembled, but it also avoids the situation in which the triangular bracket is directly welded to the web 100 of the steel channel beam in conventional construction, which causes great damage to the web 100 of the steel channel beam during disassembly and is laborious and time-consuming. In this embodiment, the diagonal rod 111 is composed of two channel steels, and the two channel steels are processed into a square tube together, which can improve the stability of the triangular bracket 11. The square tube shape has better torsion and bending resistance, can withstand forces from different directions, and ensure the stable support of the bridge deck. The square tube formed by the two channel steels has a larger cross-sectional area and moment of inertia, thereby enhancing the bearing capacity of the bracket. This design enables the bracket to withstand a larger load and meet the safety requirements during the construction and use of the bridge deck.

[0044] Embodiment three:

[0045] See also Figure 1-2 The bracket base 16 includes a screw rod, a support nut 167, and an anti-fall nut 166. The vertical rod 112 is composed of two oppositely arranged channel steels. A Φ48 short steel pipe 165 is welded between the bottoms of the two channel steels. The screw rod is installed through the inner hole of the Φ48 short steel pipe 165. The support nut 167 is threadedly connected to the screw rod to limit the triangular bracket 11. The anti-fall nut 166 is arranged on the side opposite to the support nut 167 to prevent the base from falling.

[0046] In this embodiment, the vertical rod 112 is arranged to be two, mounted back to back on the channel steel, and a steel pipe is welded between the bottom ends of the channel steel, which is convenient for connection with the screw rod of the bracket base 16. Support nuts 167 and anti-fall nuts 166 are arranged on both sides of the vertical rod 112 on the screw rod, which is convenient for adjusting the position of the vertical rod 112 on the screw rod and locking the screw rod to prevent it from falling off. The angle of the triangular bracket 11 can be adjusted by adjusting the position of the end of the vertical rod 112 on the screw rod, which is convenient for subsequent lowering of the template for disassembly.

[0047] Embodiment 4:

[0048] See also Figure 2-3 The end where the support bar 22 is connected to the upper flange plate 101 of the steel channel beam has a groove for overlapping the center seam bottom mold panel 211. After the center seam bottom mold panel 211 is overlapped with the top surface of the support bar 22, its top surface is flush with the top surface of the upper flange plate 101 of the steel channel beam, and the center seam bottom mold panel 211 is welded and fixed to the upper flange plate 101 of the steel channel beam. The set groove can facilitate the subsequent installation of the center seam bottom mold structure 21. The center seam bottom mold panel 211 is flush with the top surface of the upper flange plate 101 of the steel channel beam. At the same time, the setting of the groove can also play a positioning role for the two ends of the center seam bottom mold panel 211 during installation. The groove design can also limit the center seam bottom mold structure 21 to prevent it from detaching. After the two ends of the center seam bottom mold panel 211 are overlapped with the support bar 22, they are welded and fixed. This design can avoid leakage during pouring and improve the stability of the center seam bottom mold installation.

[0049] The formwork system 3 in the steel trough includes multiple vertical poles, connecting rods, adjustable top supports, and adjustable bottom supports. The multiple vertical poles are connected by connecting rods. The adjustable top support is installed on the top of each vertical pole, and the main ribs of the bottom formwork are installed on the adjustable top support. Wooden squares are laid on the main ribs, and plywood formwork is laid on the wooden squares. The wooden formwork is connected to the flange plate 101 on the steel trough beam. The bottom of each vertical pole is connected to the bottom plate of the steel trough beam through an adjustable bottom support. The steel trough formwork system 3 is adopted, and the adjustable top support and adjustable bottom support are respectively arranged on the upper and lower parts of the vertical poles to achieve support between the bridge deck and the bottom plate of the steel trough beam, thereby effectively ensuring the mold installation quality of the bridge deck bottom formwork.

[0050] A construction method for a cast-in-place bridge deck bottom formwork support system comprises the following steps:

[0051] a. All triangular brackets 11, lifting lugs 14 steel plates and support bars 22 are prefabricated in the factory and welded with the steel channel beam web 100 and the steel channel beam upper flange plate 101 in the factory and then transported to the construction site;

[0052] b. Installation of steel channel beam structures: First, multiple steel channel beam structures are installed on the bridge piers according to the design requirements, and then the steel channel beam bottom plates are installed to form multiple center seam cells in sequence;

[0053] c. Install the wing plate bottom template system. Insert the slot at the crossbar end of the triangular bracket 11 into the steel plate of the lifting ear 14 and then connect and fix them through the hinge bolts 15. The bottom of the vertical rod 112 of the triangular bracket 11 is supported by the bracket bottom bracket 16 and the outer wall of the steel channel beam web 100. Then install the distribution beam 13 on the crossbar of the triangular bracket 11, and then install the wing plate bottom template 12 on the distribution beam 13. The end of the crossbar away from the steel plate of the lifting ear 14 is also provided with a railing socket 17. The wing plate bottom template 12 also serves as an anti-collision guardrail and anti-falling platform;

[0054] d. Installation of the center seam bottom formwork structure 21. First, determine the length of the center seam bottom formwork panel 211 according to the width between each center seam grid compartment. Then, weld the center seam bottom formwork rib 212 at the bottom of the center seam bottom formwork panel 211 to form a whole center seam bottom formwork. Then, use a crane to hoist the whole center seam bottom formwork to the center seam grid compartment. The two ends of the center seam bottom formwork panel 211 in the center seam bottom formwork structure 21 are seated on the support bars 22 at the ends of the upper flange plate 101 of the steel channel beam and fixed by spot welding.

[0055] e. Installation of formwork system 3 in steel channel: first determine the length of the full-floor support pole according to the height of each steel channel, then install an adjustable bottom bracket with adjustable height on the bottom plate of the steel channel beam, install the poles on the adjustable bottom bracket, the pole spacing should match the standard crossbar, install an adjustable top bracket on the top of the pole, install the bottom formwork main rib on the adjustable top bracket, lay wooden squares on the main ribs, lay plywood formwork on the wooden squares, and the wooden formwork should be flush with the upper flange plate of the steel channel beam;

[0056] f. After the bottom formwork system is completed, the bridge deck reinforced concrete construction is carried out;

[0057] g. After the bridge deck is completed, the wing plate bottom formwork system is removed, and the formwork system 3 in the steel trough is removed according to the usual process. The personnel enter the steel trough from the reserved hole, knock off the adjustable top support to release the force on the full-height bracket, and then pull out the wooden square and wooden formwork, and then remove the main rib and the full-height bracket in the steel trough;

[0058] h. After the construction of the anti-collision guardrail is completed, the bridge deck wing plate bottom formwork system is dismantled. First, the concrete and debris on the wing plate bottom formwork 12 are cleaned up, and then the support nut 167 of the bracket bottom bracket 16 is loosened with the help of a working platform such as a testing trolley or a climbing vehicle, so that the triangular bracket 11 rotates a certain angle with the hinge bolt 15, so that the wing plate bottom formwork 12 is emptied, and the wing plate bottom formwork 12 is pulled out piece by piece and stacked on the bridge deck, and then the distribution beams 13 are dismantled one by one, and then the triangular bracket 11 is gently lifted by the hoisting device, and the hinge bolts 15 are removed, and the triangular bracket 11 is immediately separated from the lifting ear 14 steel plate;

[0059] i. The center seam bottom formwork structure 21 is not removed after the bridge deck construction is completed.

[0060] The above is an exemplary description of the present invention in combination with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A cast-in-place bridge deck bottom formwork support system for an open steel beam-concrete bridge, characterized in that: It includes a steel channel beam structure, a flange bottom formwork system, a center seam bottom formwork structure (21), and a steel channel inner formwork system (3); The steel channel beam structure comprises a steel channel beam bottom plate, a steel channel beam web plate (100), and a steel channel beam upper flange plate (101); a plurality of steel channel beam web plates (100) are distributed on the steel channel beam bottom plate; a steel channel beam upper flange plate (101) is welded to the top of the steel channel beam web plate (100); a plurality of studs are evenly distributed on the top of the steel channel beam upper flange plate (101); a flange plate bottom formwork system is arranged on the steel channel beam web plates (100) arranged at both ends of the steel channel beam bottom plate, and is detachably connected to the steel channel beam web plates (100); The wing plate bottom formwork system comprises a wing plate bottom formwork (12), a plurality of distribution beams (13), a lifting lug (14) steel plate, and a triangular bracket (11); a lifting lug (14) steel plate is welded at the angle between the top end of the steel channel beam web plate (100) and the upper flange plate (101) of the steel channel beam; one side of the top end of the triangular bracket (11) is detachably connected to the lifting lug (14) steel plate; the bottom end of the triangular bracket (11) is connected to the steel channel beam web plate (100) through a bracket bottom bracket (16); a plurality of distribution beams (13) are arrayed and distributed at the top end of the triangular bracket (11); the wing plate bottom formwork (12) is installed on the top of the plurality of distribution beams (13) and is connected to the ends of the adjacent upper flange plates (101) of the steel channel beams; The center seam bottom formwork structure (21) is installed between two steel channel beam structures. The bottom of each center seam bottom formwork structure (21) is supported by a steel channel inner formwork system (3). The center seam bottom formwork structure (21) comprises a center seam bottom formwork rib plate (212), a center seam bottom formwork panel (211), and a hook (213). The end of the steel channel beam upper flange plate (101) is welded with a support bar (22). The two ends of the center seam bottom membrane structure (21) are supported by the support bar (22). A plurality of center seam bottom formwork rib plates (212) are welded at the bottom of the center seam bottom formwork panel (211). The two ends of the center seam bottom formwork rib plates (212) leave a lap length for the end of the center seam bottom formwork panel (211) and the support bar (22). A plurality of hooks (213) for hoisting are provided at the top of the center seam bottom formwork panel (211).

2. A cast-in-place bridge deck bottom formwork support system according to claim 1, characterized in that: The triangular bracket (11) comprises an oblique rod (111), a vertical rod (112), and a cross beam (113). One end of the cross beam (113) is fixedly connected to the top end of the vertical rod (112). The oblique rod (111) is arranged between the angles between the cross rod and the vertical rod (112) to form a triangle. The vertical rod (112) is parallel to the web of the steel channel beam (100). The end of the cross rod close to the vertical rod (112) is detachably connected to the steel plate of the hanging ear (14). The bottom end of the vertical rod (112) is movably connected to the bracket bottom bracket (16). The bracket bottom bracket (16) is vertically connected to the web of the steel channel beam (100).

3. A cast-in-place bridge deck bottom formwork support system according to claim 2, characterized in that: The bracket bottom support (16) comprises a screw rod, a support nut (167), and an anti-falling nut (166). The vertical rod (112) is composed of two oppositely arranged channel steels. A Φ48 short steel pipe (165) is welded between the bottoms of the two channel steels. The screw rod is installed through the inner hole of the Φ48 short steel pipe (165). The support nut (167) is threadedly connected with the screw rod and is used to limit the triangular bracket (11). The anti-falling nut (166) is arranged on a side opposite to the support nut (167) to prevent the bottom support from falling.

4. The cast-in-place bridge deck bottom formwork support system according to claim 1, characterized in that: The cross beam (113) is provided with a slot for plugging into the steel plate of the lifting lug (14), and bolt holes are provided at the slots. After the slots on the cross beam (113) are plugged into the steel plate of the lifting lug (14), they are connected and fixed by passing hinge bolts (15) through the bolt holes. The end of the cross bar away from the steel plate of the lifting lug (14) is also provided with a railing socket (17).

5. The cast-in-place bridge deck bottom formwork support system according to claim 1, characterized in that: One end of the support bar (22) connected to the upper flange plate (101) of the steel channel beam is provided with a groove for overlapping the center seam bottom formwork panel (211). After the center seam bottom formwork panel (211) overlaps the top surface of the support bar (22), its top surface is flush with the top surface of the upper flange plate (101) of the steel channel beam, and the center seam bottom formwork panel (211) and the upper flange plate (101) of the steel channel beam are welded and fixed.

6. The cast-in-place bridge deck bottom formwork support system according to claim 1, characterized in that: The steel channel inner formwork system (3) comprises a plurality of vertical poles, connecting rods, an adjustable top support and an adjustable bottom support. The plurality of vertical poles are connected by connecting rods. The top of each vertical pole is equipped with an adjustable top support. The main ribs of the bottom formwork are installed on the adjustable top support. The main ribs are paved with wooden planks. The wooden planks are paved with glued wood formwork. The wooden formwork is connected with the upper flange plate (101) of the steel channel beam. The bottom of each vertical pole is connected with the bottom plate of the steel channel beam through the adjustable bottom support.

7. A construction method for a cast-in-place bridge deck bottom formwork support system, characterized in that: The following steps are included: a. All triangular brackets (11), lifting lugs (14) steel plates and support bars (22) are prefabricated in the factory and welded with the steel channel beam web plate (100) and the steel channel beam upper flange plate (101) in the factory and then transported to the construction site; b. Installation of steel channel beam structures: First, multiple steel channel beam structures are installed on the bridge piers according to the design requirements, and then the steel channel beam bottom plates are installed to form multiple center seam cells in sequence; c. Install the wing plate bottom template system, insert the slot at the cross bar end of the triangular bracket (11) into the steel plate of the lifting ear (14) and then connect and fix them by hinge bolts (15), the bottom of the vertical rod (112) of the triangular bracket (11) is supported by the bracket bottom support (16) and the outer wall of the steel channel beam web (100), then the distribution beam (13) is installed on the cross bar of the triangular bracket (11), and then the wing plate bottom template (12) is installed on the distribution beam (13), and the end of the cross bar away from the steel plate of the lifting ear (14) is also provided with a railing socket (17), and the wing plate bottom template (12) also serves as an anti-collision guardrail and anti-falling platform; d. Installing the center seam bottom formwork structure (21), firstly determining the length of the center seam bottom formwork panel (211) according to the width between each center seam lattice compartment, then welding the center seam bottom formwork rib plate (212) at the bottom of the center seam bottom formwork panel (211) to form a whole center seam bottom formwork, then hoisting the whole center seam bottom formwork to the center seam lattice compartment with the aid of a crane, one-to-one correspondingly, the two ends of the center seam bottom formwork panel (211) in the center seam bottom formwork structure (21) are seated on the support bars (22) at the ends of the upper flange plate (101) of the steel channel beam, and fixed by spot welding; e. Installation of the formwork system (3) in the steel channel. First, determine the length of the full-floor support pole according to the height of each steel channel. Then, install an adjustable bottom bracket with adjustable height on the bottom plate of the steel channel beam. Install the poles on the adjustable bottom bracket. The distance between the poles should match the standard crossbar. Install an adjustable top bracket on the top of the pole. Install the main rib of the bottom formwork on the adjustable top bracket. Lay wooden planks on the main ribs. Lay plywood formwork on the wooden planks. The wooden formwork is flush with the upper flange plate of the steel channel beam. f. After the bottom formwork system is completed, the bridge deck reinforced concrete construction is carried out; g. After the bridge deck is completed, the wing plate bottom formwork system is removed, and the steel channel inner formwork system (3) is removed according to the usual process. The personnel enter the steel channel through the reserved hole, knock the adjustable top support loose to release the force on the full-height bracket, and then pull out the wooden square and wooden formwork, and then remove the main rib and the full-height bracket in the steel channel; h. After the construction of the anti-collision guardrail is completed, the bridge deck wing plate bottom formwork system is removed. First, the concrete and debris on the wing plate bottom formwork (12) are cleaned up, and then the support nut (167) of the bracket bottom support (16) is loosened with the help of a working platform such as an inspection trolley or a climbing vehicle, so that the triangular bracket (11) rotates a certain angle with the hinge bolt (15), so that the wing plate bottom formwork (12) is emptied, and the wing plate bottom formwork (12) is pulled out piece by piece and stacked on the bridge deck, and then the distribution beams (13) are removed one by one, and then the triangular bracket (11) is gently lifted by the lifting device, and the hinge bolts (15) are removed, and the triangular bracket (11) is immediately separated from the lifting ear (14) steel plate; i. The center seam bottom formwork structure (21) is not removed after the bridge deck construction is completed.

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