Cast-in-place bridge deck slab bottom die supporting system

Abstract

The utility model 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, which are used for an open type steel beam-concrete bridge and adopt a triangular bracket to construct a bridge deck slab wing plate of the open type steel beam-concrete bridge. 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, a triangular bracket is hung on the lifting lug steel plate through bolts, a bracket bottom support is transversely installed at the bottom of the triangular bracket, and a bottom fulcrum of the triangular bracket is perpendicularly supported on the steel beam web through the bottom support to bear transverse supporting force. Compared with a traditional triangular bracket, the mounting and dismounting progress can be accelerated, the gradient of the triangular bracket can be conveniently adjusted, the adverse effect on the appearance of a steel channel beam web can be reduced, meanwhile, the anti-torsion performance of an upper flange plate of the steel channel beam is enhanced through the lifting lug steel plates, the center joint bottom die structure is in a pocket hanging type without dismounting the bottom die, site construction is easy, slurry leakage is avoided, and the construction efficiency is improved. A large amount of support materials and labor cost are saved, and the adverse effect of formwork mounting and dismounting on under-bridge traffic is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a cast-in-place bridge deck bottom formwork support system. Background Art

[0002] The bridge deck construction of the "open steel beam-concrete bridge" has two methods: prefabricated bridge deck and integral cast-in-place. The integral cast-in-place bridge deck can eliminate the construction joints of the bridge deck concrete, and has better structural integrity and durability. For cast-in-place bridge decks, the bridge deck bottom formwork system is usually supported on the steel channel beam structure, and the bridge deck wing plates are constructed by installing triangular brackets on the web of the steel channel beam. After the steel channel beam is installed in place, the prepared triangular brackets are welded to the web of the steel channel beam. The triangular brackets are fixed both above and below, and then the distribution beam is laid on the bracket crossbeam, and 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 a crane and a trolley. The bridge deck within the steel channel beam trough is constructed by erecting a full-frame scaffold within the steel channel. The full-frame scaffold is set up according to the spatial dimensions of the steel channel. Small steel or thick wooden planks for the main ribs are installed on the scaffold top supports. Secondary wooden planks are then placed on the main ribs, and plywood formwork is placed on the wooden planks. After the concrete of the bridge deck is completed, personnel enter the steel channel through a reserved skylight to remove the bottom formwork, wooden planks, and full-frame scaffold. For multi-steel beam "open-type steel beam-concrete bridges," the central connecting band is usually constructed using a hanging formwork. A supporting bench, higher than the bridge deck concrete, is erected on the upper flange plate of the steel channel beam. A shoulder beam is then placed across the bench. The bottom formwork of the central connecting band is securely held under the flange plate using a hanger through the shoulder beam. When pouring concrete, a small hole is reserved in the appropriate position of the bridge deck. A steel wire rope, pre-attached to the bottom formwork, is pulled through the small hole to the bridge deck. After the bridge deck is completed, the bottom formwork is removed through the small hole, and the flange bottom formwork is lowered to the ground using the same steel wire rope.

[0003] The existing technical support system still has some limitations:

[0004] Fixing the triangular brackets on the web of the steel channel beam above and below, especially welding them on the web of the steel channel beam, requires a lot of work and labor, and it is inconvenient to adjust the slope of the bracket. The central connecting belt of the "open steel beam-concrete" bridge with multiple center seams is constructed using a hanging formwork. Due to safety requirements, the wing plate bottom formwork needs to be installed first and then the steel bars are tied. The benches, shoulder beams, and hangers installed first seriously affect the installation progress of the bridge deck steel bars. At the same time, the hanging formwork is complicated to construct, and it uses a lot of materials and labor. Removing the bottom formwork has a great impact on the traffic under the bridge.

[0005] The purpose of the present invention is to provide a cast-in-place bridge deck bottom formwork support system to solve the problems mentioned in the above background technology. Utility Model Content

[0006] To achieve the above-mentioned purpose, the utility model 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. Multiple steel channel beam web plates are distributed on the steel channel beam bottom plate. The top of the steel channel beam web plate is welded to the steel channel beam upper flange plate. Multiple studs are evenly distributed on the top of the steel channel beam upper flange plate. The flange plate bottom formwork system is installed on the steel channel beam web plates at both ends of the steel channel beam bottom plate and is detachably connected to the steel channel beam web plates.

[0008] The flange bottom formwork system includes the flange bottom formwork, multiple distribution beams, lug steel plates, and triangular brackets. 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 of the triangular bracket is connected to the steel channel beam web via a bracket bottom bracket. Multiple distribution beams are arrayed at the top of the triangular bracket. The flange bottom formwork is installed on top of the multiple distribution beams and connected to the ends of the adjacent steel channel beam upper flange plates.

[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 reinforcement plate, a center seam bottom formwork panel, and a hook. The end of the upper flange plate of the steel channel beam is welded with a support bar, and the two ends of the center seam bottom formwork structure are supported by the support bar. A plurality of center seam bottom formwork reinforcement plates are welded to the bottom of the center seam bottom formwork panel, and the overlap length of the center seam bottom formwork panel end and the support bar is left at both ends of the center seam bottom formwork reinforcement 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 angle 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 lifting 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 crossbeam is provided with a slot for connecting with the lug steel plate, and the slots are provided with bolt holes. After the slots on the crossbeam are connected with the lug 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 crossbar away from the lug steel plate.

[0013] As a further improvement of the present invention, a groove is left at one end of the support bar where it is connected to the upper flange plate of the steel channel beam for the center seam bottom formwork panel to overlap. After the center seam bottom formwork panel is overlapped with 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. The top of each vertical pole is installed with an adjustable top support. The main ribs of the bottom formwork are installed on the adjustable top support. Wooden squares are laid on the main ribs. Glued wood formwork is laid on the wooden squares. The wooden formwork is connected to the upper flange plate of 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.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model adopts triangular brackets 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 of the steel channel beam and the web of the steel channel beam, and hangs the triangular bracket on the lug steel plate by bolts, and installs a bracket bottom support transversely at the bottom of the triangular bracket to vertically support the web of the steel channel beam. The bottom support point of the triangular bracket is transversely supported on the web of the steel beam through the bracket bottom support to bear the transverse supporting force, and the construction process is simple. Compared with the traditional triangular bracket, it can speed up the installation and removal progress, facilitate the adjustment of the slope of the triangular bracket, and reduce the adverse effect on the appearance of the web of the steel channel beam. At the same time, the lug steel plate strengthens the torsional performance of the flange plate of 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, saving a lot of bracket materials and labor costs, greatly reducing construction risks, and eliminating the adverse effects of installing and removing formwork on traffic under the bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the bridge deck and bottom formwork support system of the present invention;

[0018] Figure 2 This is a schematic diagram of the bottom membrane system structure of the present utility model;

[0019] Figure 3 This is a schematic diagram of the center seam bottom mold structure of the present utility model.

[0020] In the figure: 100, web of steel channel beam; 101, upper flange plate of steel channel beam; 11, triangular bracket; 111, diagonal rod; 112, vertical rod; 113, crossbeam; 12, flange bottom formwork; 13, distribution beam; 14, lifting lug; 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; 213, hook; 22, support bar; 3. Formwork system in steel channel. DETAILED DESCRIPTION

[0021] In order to facilitate the 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.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are for the purpose of describing specific embodiments only and are not intended to limit this invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] Example 1:

[0025] See also Figure 1-3 The utility model 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 21, and a steel channel inner formwork system 3;

[0026] The steel channel beam structure includes a steel channel beam bottom plate, a steel channel beam web 100, and a steel channel beam upper flange plate 101. A plurality of steel channel beam webs 100 are distributed on the steel channel beam bottom plate. The top of the steel channel beam web 100 is welded with the 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 bottom formwork system is arranged on the steel channel beam webs 100 arranged at both ends of the steel channel beam bottom plate and is detachably connected to the steel channel beam webs 100.

[0027] The flange bottom formwork system includes a flange bottom formwork 12, multiple distribution beams 13, a lifting lug 14 steel plate, and a triangular bracket 11. The lifting lug 14 steel plate is welded at the angle between the top of the steel channel beam web 100 and the steel channel beam upper flange plate 101. The top side 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 via a bracket bottom bracket 16. Multiple distribution beams 13 are distributed in an array at the top of the triangular bracket 11. The flange bottom formwork 12 is installed on the top of the multiple distribution beams 13 and is connected to the end of the adjacent steel channel beam upper flange plate 101.

[0028] 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 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 ribs 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 212 leave a lap length between the end of the center seam bottom formwork panel 211 and the support bar 22. The top of the center seam bottom formwork panel 211 is provided with a plurality of hooks 213 for lifting.

[0029] In this embodiment, a wall-mounted triangular bracket 11 is used to construct the bridge deck flange 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 on the lug 14 steel plate to install a bolt 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 this triangular bracket 11 is hinged, and the bottom support point is laterally supported on the web plate of the steel beam through the bracket bottom bracket 16 to withstand the lateral support force. In the first step, 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 thin steel plates according to the size of the central connecting belt. One formwork corresponds to one center seam grid. A flat steel support bar 22 with a width of 3 to 5 cm and a thickness of 10 mm is welded at the end of the flange plate 101 of 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 removed. The center seam bottom formwork structure 21 is easy to install, does not leak slurry, is convenient for binding the bridge deck steel bars, speeds up the construction progress, and minimizes the impact on the traffic under the bridge.

[0030] Example 2:

[0031] See also Figure 1-2The triangular bracket 11 includes an oblique rod 111, a vertical rod 112, and a horizontal beam 113. One end of the horizontal beam 113 is fixedly connected to the top of the vertical rod 112. The oblique rod 111 is arranged between the angle between the horizontal 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 horizontal 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 base 16, and the bracket base 16 is vertically connected to the web 100 of the steel channel beam.

[0032] The crossbeam 113 is provided with slots for connecting with the steel plates of the lifting ears 14, and bolt holes are provided at the slots. After the slots on the crossbeam 113 are connected with the steel plates of the lifting ears 14, they are connected and fixed by means of hinged 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 connecting with the steel plates of the lifting ears 14. The crossbeam 113 is provided with slots for connecting with the steel plates of the lifting ears 14, and the slot here is the distance between the two steel channels.

[0033] When in use, after the slots at the ends of the cross bars of the triangular bracket 11 are plugged into the lifting ear 14 steel plates on the web 100 of the steel channel beam, they are connected and fixed by hinged bolts 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 installed and disassembled quickly, but it also avoids the situation in conventional construction where the triangular bracket is directly welded to the web 100 of the steel channel beam, 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 square tubes together, which can improve the stability of the diagonal rod 111 pressure rod of the triangular bracket 11. 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 larger loads and meet the safety requirements during the construction and use of the bridge deck.

[0034] Example 3:

[0035] 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.

[0036] In this embodiment, the vertical rod 112 is configured as two channel steels installed back to back, and steel pipes are welded between the bottom ends of the channel steels to facilitate connection with the screw rod of the bracket base 16. Support nuts 167 and anti-fall nuts 166 are set on both sides of the vertical rod 112 on the screw rod to facilitate adjustment of the position of the vertical rod 112 on the screw rod and lock the screw rod to prevent it from falling off. By adjusting the position of the end of the vertical rod 112 on the screw rod, the angle of the triangular bracket 11 can be adjusted to facilitate subsequent lowering of the template for disassembly.

[0037] Example 4:

[0038] See also Figure 2-3 After the two ends of the middle seam bottom formwork 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 middle seam bottom formwork installation.

[0039] 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 strips are laid on the main ribs, and plywood formwork is laid on the wooden strips. The wooden formwork is connected to the upper flange plate 101 of 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 set on the upper and lower vertical poles to achieve support between the bridge deck and the bottom plate of the steel trough beam, thereby effectively ensuring the formwork quality of the bridge deck bottom formwork.

[0040] The above description of the present invention is illustrative 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 scope of protection of the present invention.

Claims

1. A cast-in-place bridge deck bottom formwork support system for an open steel beam-concrete bridge, characterized by: 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 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). The lifting lug (14) steel plate is welded at the angle between the top end of the steel channel beam web (100) and the steel channel beam upper flange plate (101). 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 (100) through a bracket bottom bracket (16). The 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 end of the adjacent steel channel beam upper flange plate (101). 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 reinforcement 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 formwork structure (21) are supported by the support bar (22). A plurality of center seam bottom formwork reinforcement 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 reinforcement plates (212) leave a lap length between the end of the center seam bottom formwork panel (211) and the support bar (22). The top of the center seam bottom formwork panel (211) is provided with a plurality of hooks (213) for lifting.

2. The cast-in-situ bridge deck bottom formwork support system according to claim 1, characterized in that: The triangular bracket (11) includes an oblique rod (111), a vertical rod (112), and a crossbeam (113). One end of the crossbeam (113) is fixedly connected to the top of the vertical rod (112). The oblique rod (111) is arranged between the angles between the crossbeam 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 crossbeam near the vertical rod (112) is detachably connected to the steel plate of the lug (14). The bottom end of the vertical rod (112) is movably connected to the bracket bottom support (16). The bracket bottom support (16) is vertically connected to the web of the steel channel beam (100).

3. The cast-in-situ bridge deck bottom formwork support system according to claim 2, characterized in that: The bracket bottom support (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 and is used 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 bottom support from falling.

4. The cast-in-situ bridge deck bottom formwork support system according to claim 1, characterized in that: The crossbeam (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 crossbeam (113) are plugged into the steel plate of the lifting lug (14), they are connected and fixed by means of hinged bolts (15) passing through the bolt holes. The end of the crossbar away from the steel plate of the lifting lug (14) is also provided with a railing socket (17).

5. The cast-in-situ 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) 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 formwork panel (211) and the upper flange plate (101) of the steel channel beam are welded and fixed.

6. The cast-in-situ 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, adjustable top supports and adjustable bottom supports. The plurality of vertical poles are connected by connecting rods. The top of each vertical pole is installed with an adjustable top support. The bottom formwork main ribs 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 to the upper flange plate (101) of the steel channel beam. The bottom of each vertical pole is connected to the bottom plate of the steel channel beam through the adjustable bottom support.

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