A support device for the construction of integral prefabricated π-shaped composite beam concrete

Abstract

The present invention relates to a support device for the construction of integral prefabricated π-shaped composite beam concrete. Existing formwork devices are not only inconvenient to install and disassemble, but also have low construction efficiency. The support device provided by the present invention includes a formwork structure, a beam grid structure and a column structure that are sequentially supported and arranged up and down. The formwork structure includes a shelf area formwork and a folding area formwork arranged on both sides of the shelf area formwork. The beam grid structure includes an auxiliary box beam and a main box beam that are supported and arranged up and down. The column structure includes two rows of foldable telescopic column groups that are arranged laterally opposite to each other. Each foldable telescopic column group includes at least two foldable telescopic columns arranged longitudinally. The two rows of foldable telescopic column groups are relatively folded and telescopic to adjust the height of the formwork structure. The present invention can reduce the width of the transverse bridge side of the entire formwork structure, so it can be directly constructed by a vertical lowering method of hoisting. At the same time, the column structure is foldable and telescopic, which can achieve rapid installation and disassembly, thereby improving construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a support device for the construction of integrally prefabricated π-shaped composite beam concrete. Background Art

[0002] During the construction of existing prefabricated π-shaped composite beam bridge decks, temporary piers are first placed between the two main beams of the π-shaped composite beam. Transverse connections are then installed between the beams to maintain stability. Steel pipe supports are then erected between the two main beams and the transverse connections. Formwork is then supported on the steel pipe supports. Rebar is then tied to the formwork, and the bridge deck concrete is poured. Once the concrete reaches sufficient strength, the formwork and steel pipe supports are completely disassembled, and the prefabricated π-shaped composite beam is moved to the next location. This cycle of setting up the support and formwork is repeated to produce the composite beam. Because the formwork and steel pipe supports are separate components and numerous in number, they are often connected using bolts and nuts, resulting in a complex installation and disassembly process. This reduces construction efficiency. Furthermore, the formwork and supports are bulky and heavy, making installation and disassembly inconvenient, and potentially posing safety risks. Furthermore, because the lower flange of the π-shaped composite beam's steel main beam is significantly wider than the upper flange, the concrete pouring formwork will intrude directly above the lower flange. Directly hoisting the support and formwork vertically is blocked by the lower flange of the steel main beam, making it impossible to lower it vertically. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to provide a support device for the construction of integral prefabricated π-shaped composite beam concrete. The support device adopts a telescopic folding structure that can be unfolded to support the composite beam before prefabrication. When it needs to be removed, it can be transported as a whole by folding and shrinking, avoiding the tediousness of disassembly and transportation. At the same time, since the template structure on the support device can be folded in the width direction so as to reduce the width of the template structure during hoisting, the support device of the present invention can also be directly hoisted and installed by vertical lowering, so as to achieve rapid erection, save time for subsequent composite beam construction, and effectively improve construction efficiency.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A support device for the construction of integral prefabricated π-shaped composite beam concrete, comprising a formwork structure, a beam lattice structure and a column structure which are sequentially supported up and down, the formwork structure comprising a shelf area formwork and a folding area formwork arranged on both sides of the shelf area formwork; the beam lattice structure comprises at least two transversely arranged auxiliary box beams and at least two longitudinally arranged main box beams which are supported up and down, at least two outer auxiliary box beams are hinged at both ends with auxiliary secondary box beams, the auxiliary box beams support the shelf area formwork, the auxiliary secondary box beams extend outward to support the folding area formwork and the shelf area formwork to be arranged on the same horizontal plane; the column structure comprises two rows of longitudinally oppositely arranged foldable telescopic column groups, each row of foldable telescopic column groups comprises at least two transversely arranged foldable telescopic columns, the bottom surface of each end of each main box beam is supported by the upper end surface of the foldable telescopic column, and the two rows of foldable telescopic column groups are longitudinally folded and telescoped relative to each other to adjust the height of the formwork structure.

[0006] Furthermore, the adjacent foldable telescopic columns in each row of the foldable telescopic column group are longitudinally connected to each other through a telescopic support rod; the foldable telescopic column comprises a supporting short section, a foldable short section group and a telescopic short section hinged up and down in sequence;

[0007] The support sub includes an upper support plate and a lower support plate arranged in parallel and spaced apart from each other. The upper support plate and the lower support plate are connected by a support tube. A threaded hole penetrating the support tube is provided at the center of the lower support plate.

[0008] The folding short section group includes at least one pair of folding short sections hinged to each other, each of the folding short sections includes a folding column, an upper folding plate is provided at the upper end of the folding column, and a lower folding plate is provided at the lower end, the pair of folding short sections are hinged to each other through the upper folding plate and the lower folding plate, and the upper folding plate at the uppermost end of the folding short section group is hinged to the lower support plate;

[0009] The telescopic short section includes a support screw, on which a support plate and an adjusting nut are sleeved. The support plate includes a support ring plate and a hollow tube connected to the lower plate surface of the support ring plate. The support plate is hinged to the lower folding plate at the lower end of the folding short section group.

[0010] When the foldable telescopic column is fully extended and erected, the end of the support screw is received in the support plate, and the adjusting nut is threadedly connected to the support screw and supports the support plate;

[0011] When the foldable telescopic column is completely folded, the end of the support screw passes through the support plate and is received in the support tube, and the lower support plate is threadedly connected to the support screw.

[0012] Furthermore, the supporting short sections of adjacent foldable telescopic columns on each row of the foldable telescopic column groups and / or the foldable short section groups and / or the telescopic short sections are all laterally connected to each other through the telescopic struts; a limiting member for limiting the movement of the main box beam is provided on the upper end of the upper support plate located on the supporting short section, and a plurality of limiting members for limiting the movement of the main box beam and the auxiliary box beam are provided on the main box beam and the auxiliary box beam.

[0013] Furthermore, a pull ring is provided on the lower support plate of at least the outermost support short section of the foldable telescopic column group; the edges of the lower support plates of adjacent support short sections on each row of the foldable telescopic column group have lugs with holes, and the lugs of adjacent lower support plates are connected by a telescopic strut;

[0014] The edges of the upper folding plates or lower folding plates of the adjacent folding short section groups on each row of the foldable telescopic column groups are provided with lugs with holes, and the lugs of the upper folding plates or lower folding plates of the adjacent folding short section groups are connected by a telescopic strut;

[0015] The edges of the support ring plates of adjacent telescopic short sections on each row of the foldable telescopic column group are provided with lugs with holes, and the lugs of adjacent support ring plates are connected by a telescopic strut.

[0016] Furthermore, the telescopic strut includes a rotating sleeve and a threaded rod threadedly connected to the two ends of the rotating sleeve, the outer ends of the threaded rod are provided with lug grooves with holes, and the lugs are embedded in the lug grooves and hinged by bolts; the internal threads at both ends of the rotating sleeve are opposite to each other, and when the rotating sleeve is rotated, the threaded rods at both ends extend or retract at the same time.

[0017] Furthermore, the upper and lower adjacent lower support plates and upper folding plates of each foldable telescopic column are hingedly connected along the longitudinal inner edges by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent lower support plates and upper folding plates along the transverse outer plate surfaces;

[0018] The upper and lower adjacent support ring plates of each foldable telescopic column are hingedly connected to the lower folding plate along the longitudinal inner edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent support ring plates and the lower folding plate along the longitudinal outer plate surface;

[0019] The upper folding plates and lower folding plates adjacent to each other on a pair of folding columns of each folding short section group are hinged on the edges along the longitudinal outer side through a hinge assembly, and a locking assembly is provided on the plate surfaces along the longitudinal inner side of the upper folding plates and lower folding plates adjacent to each other.

[0020] Furthermore, the hinge assembly includes at least one pair of hinge ears and hinge ear slots, the hinge ears and hinge ear slots are nested in each other, the hinge ears and hinge ear slots are connected by bolts, and the hinge ears and hinge ear slots are staggeredly arranged on the upper and lower adjacent edges of the lower support plate and the upper folding plate, the upper and lower adjacent edges of the support ring plate and the lower folding plate, and the upper and lower adjacent edges of the upper folding plate and the lower folding plate;

[0021] The locking assembly includes at least one pair of locking pins and locking holes, and the locking pins can be embedded in or disengaged from the locking holes; the locking pins and locking holes are also staggeredly arranged on the upper and lower adjacent lower support plate and upper folding plate surfaces, the upper and lower adjacent support ring plate and lower folding plate surfaces, and the upper and lower adjacent upper folding plate and lower folding plate surfaces; when the foldable telescopic column is straightened, the locking pin is inserted into each of the locking holes, and when the foldable telescopic column is retracted, the locking pin is disengaged from the locking hole.

[0022] Furthermore, the hinged auxiliary box beam end and the auxiliary secondary box beam end are hingedly locked or separated by a rotating shear locking assembly, and the rotating shear locking assembly includes a hinge member, a shear member and a locking member, and the shear member and the locking member are both arranged on the hinge member;

[0023] The hinged member includes a secondary beam end plate provided at the end of the secondary box beam and a secondary secondary beam end plate provided at the end of the secondary box beam, and the edges of the secondary beam end plate and the secondary secondary beam end plate on one longitudinal side are both provided with hinged protrusions, and the hinged protrusions are adjacent to each other in upper and lower directions and connected by pins;

[0024] The locking member includes a pair of locking posts and locking hooks, and the locking hooks can be hung on or detached from the locking posts; the locking posts are provided on the outer plate surface of the auxiliary beam end plate and the outer plate surface of the auxiliary secondary beam end plate on one side of the hinged protrusion, and the locking hook is hung on one of the locking posts; the locking posts are provided on the end of the auxiliary beam end plate and the end of the auxiliary secondary beam end plate on the side opposite to the hinged protrusion, and the locking hook is hung on one of the locking posts;

[0025] The shear member includes a grooved shear pin and a double insertion hole engaged with the grooved shear pin. The grooved shear pin can be inserted into or out of the double insertion hole. The double insertion holes are provided through the outer end surface of the auxiliary beam end plate and the auxiliary secondary beam end plate on the side opposite to the hinge protrusion.

[0026] When the auxiliary beam end plate and the auxiliary secondary beam end plate are hingedly fitted, the grooved shear pins are inserted into the double holes and the locking hooks located on the opposite side of the hinged protrusions are hung on the locking columns so that the auxiliary secondary box beam and the auxiliary box beam are relatively connected; when the auxiliary beam end plate and the auxiliary secondary beam end plate are hingedly separated, the grooved shear pins are disengaged from the double holes and the locking hooks located on the same side of the hinged protrusions are hung on the locking columns so that the auxiliary secondary box beam and the auxiliary box beam are folded and connected.

[0027] Furthermore, the shelving area template is composed of several strip-shaped lightweight flat plates arranged adjacent to each other in sequence, and the folding area template is composed of at least one strip-shaped lightweight flat plate arranged. When the secondary box girder and the secondary box girder are folded and connected, the folding area template is set on the shelving area template.

[0028] Furthermore, the limiting component is a limiting angle steel, which is respectively arranged on the main box beam and the auxiliary box beam to limit the movement of the auxiliary box beam. The limiting angle steel on the main box beam is in contact with the two side surfaces of the auxiliary box beam, and the limiting angle steel on the auxiliary box beam is in contact with at least the opposite sides of the two main box beams; the limiting angle steel is arranged on the upper end of the upper support plate to limit the lateral movement of the main box beam, and the limiting angle steel on the upper support plate is in contact with the two side surfaces of the main box beam.

[0029] The present invention adopts the above technical solution, which has the following advantages and effects:

[0030] 1. The support device of the present invention replaces the cumbersome process of setting up and dismantling the support and formwork required for the construction of the concrete bridge deck of the traditional integral prefabricated π-shaped composite beam through an integral telescopic folding column structure and a folding beam grid structure, thereby reducing the labor intensity of workers, minimizing safety hazards, and effectively improving the efficiency of setting up and installing the support device.

[0031] 2. The column structure of the support device of the present invention is fixed by relatively folding and telescopic construction. The folding short section group of the folding telescopic column of the column structure is connected as a whole with the locking member and the hinge member passing between the supporting short section and the telescopic short section, so that the column structure can stably support the beam grid structure and the formwork structure after it is fully extended. When it is necessary to prefabricate the π-shaped composite beams in sequence, the folding short section group can be relatively folded and retracted to the inside of the telescopic short section, thereby reducing the height of the entire support device, facilitating the lateral movement of the prefabricated π-shaped prefabricated beams, and improving the construction efficiency.

[0032] 3. The beam grid structure on the support device of the present invention adopts a folding structure. The secondary box beams and the secondary box beams on both sides of the beam grid structure can be folded inward and contracted. The folding area template and the shelf area template of the template structure are overlapped and placed to reduce the longitudinal side width of the entire template structure. It will not be affected by the width of the lower flange of the steel main beam, so that the support device of the present invention can be constructed by a direct lifting and vertical lowering method. Therefore, the support device of the present invention is not restricted by the construction site and meets the needs of direct construction of prefabricated π-shaped prefabricated beams at the bridge erection site. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the stent device of the present invention in a fully folded and contracted state.

[0034] Figure 2 Schematic diagram of the structure of the foldable short section of the stent device of the present invention in the folded state.

[0035] Figure 3 This is a schematic structural diagram of the folded short section of the stent device of the present invention in a semi-extended state.

[0036] Figure 4 Schematic diagram of the structure of the stent device of the present invention in a fully extended state.

[0037] Figure 5 It is a structural schematic diagram of the template structure of the present invention.

[0038] Figure 6 It is a structural schematic diagram of the beam grillage structure of the present invention.

[0039] Figure 7 It is an enlarged structural schematic diagram of the hinged connection between the auxiliary box girder and the auxiliary secondary box girder of the present invention.

[0040] Figure 8 It is a structural schematic diagram of the column structure of the present invention.

[0041] Figure 9 It is a schematic diagram of the enlarged structure of the support pup joint of the present invention.

[0042] Figure 10 for Figure 9 Schematic diagram of the explosion structure.

[0043] Figure 11 It is a schematic diagram of the enlarged structure of the folding short section of the present invention.

[0044] Figure 12 for Figure 11 Schematic diagram of the explosion structure.

[0045] Figure 13 It is a schematic diagram of the enlarged structure of the lower folding short section of the present invention.

[0046] Figure 14It is a schematic diagram of the enlarged structure of the telescopic pup joint of the present invention.

[0047] Figure 15 for Figure 14 Schematic diagram of the explosion structure.

[0048] Figure 16 It is a schematic diagram of the enlarged structure of the telescopic support rod of the present invention.

[0049] Among them, 1-formwork structure, 2-beam grid structure, 3-column structure, 011-folding area formwork, 012-shelf area formwork, 021-secondary box beam, 022-rotational shear locking assembly, 023-secondary box beam, 024-main box beam, 031-support short section, 032-folding short section, 033-telescopic support rod, 034-telescopic short section, 041-limiting angle steel, 042-pull ring, 051-locking pin, 05 2-locking hole, 061-lug, 062-lug groove, 071-hinge ear, 072-hinge ear groove, 0221-sub-beam end plate, 0222-sub-secondary beam end plate, 0223-hinge protrusion, 0224-pin, 0225-locking column, 0226-locking hook, 0227-grooved shear pin, 0228-double socket, 0311-upper support plate, 0312-support tube, 0313-lower support plate, 0321-folding column, 0322-upper folding plate, 0323-lower folding plate, 0341-support ring plate, 0342-hollow tube, 0343-adjusting nut, 0344-support screw, 0345-support base plate, 0331-rotating sleeve, 0332-threaded rod. DETAILED DESCRIPTION

[0050] The following will be described in detail with reference to the accompanying drawings to provide a clearer understanding of the objectives, features and advantages of the present invention. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0051] The present invention provides a formwork device for the construction of integrally prefabricated π-shaped composite concrete beams. The formwork device comprises a formwork structure and a support structure, which are detachably connected to each other from top to bottom. The formwork structure is supported on the upper end of the support structure in a foldable manner, and the support structure is detachably connected using a telescopic and adjustable bracket structure. This invention reduces the longitudinal width of the entire formwork structure, allowing for direct vertical lowering via hoisting. Furthermore, the detachable connection between the formwork structure and the support structure allows for rapid installation and removal, improving construction efficiency.

[0052] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4The present invention provides a support device for the construction of integral prefabricated π-shaped composite beam concrete, comprising a template structure 1, a beam lattice structure 2, and a column structure 3, which are sequentially supported from top to bottom. The template structure 2 comprises a shelf area template 012 and folding area templates 011 arranged on both sides of the shelf area template; the beam lattice structure 2 comprises at least two transversely arranged auxiliary box beams 023 and at least two longitudinally arranged main box beams 024, which are supported from top to bottom. At least two outer auxiliary box beams are hingedly connected at both ends with auxiliary secondary box beams 021. The auxiliary box beams 02 3 supports the shelving area formwork, the auxiliary secondary box beam extends outward to support the folding area formwork 011 and the shelving area formwork 012 arranged on the same horizontal plane; the column structure 3 includes two rows of foldable telescopic column groups arranged longitudinally opposite to each other, each row of foldable telescopic column groups includes at least two transversely arranged foldable telescopic columns, and the bottom surface of each end of each main box beam 024 is supported by the upper end surface of the foldable telescopic column, and the two rows of foldable telescopic column groups are relatively folded and telescoped to adjust the height of the formwork structure 1.

[0053] Specifically, the shelf area template 012 and the folding area template 011 of the template structure are arranged side by side, the shelf area template and the folding area template are detachably embedded in the beam grid structure 2, and the beam grid structure 2 is detachably embedded in the column structure 3.

[0054] In this embodiment, the lattice structure 3 includes two main box girders 024 arranged at intervals in the longitudinal direction and five transverse auxiliary box girders 023 arranged at intervals in the transverse direction. The length of the two main box girders, the number of the five auxiliary box girders, and the spacing between the auxiliary box girders are determined according to the length of the prefabricated π-shaped composite beam, and the spacing between the two main box girders is determined according to the width of the prefabricated π-shaped composite beam.

[0055] Furthermore, the shelving area template 012 is composed of several strip-shaped lightweight flat plates arranged adjacent to each other in sequence, and the folding area template 011 is composed of at least one strip-shaped lightweight flat plate arranged. When the secondary box girder 021 and the secondary box girder 023 are folded and connected, the folding area template 011 is set on the shelving area template 012.

[0056] In this embodiment, the shelving area template 012 includes four strip-shaped lightweight flat plates arranged adjacent to each other in sequence, and the folding area templates on both sides are each one strip-shaped lightweight flat plate. When the shelving area template and the folding area template are arranged on the same horizontal plane, the six strip-shaped lightweight flat plates are arranged adjacent to each other in sequence. When the folding area template is set on the shelving area template, the folding area template can be placed above the four strip-shaped lightweight flat plates of the shelving area template, and when placed, it can be preferably overlapped and placed on the strip-shaped lightweight flat plates on both sides of the shelving area template.

[0057] Furthermore, a number of limiting members are provided on the main box girder 024 and the auxiliary box girder 023 for limiting the movement of the two. The specific number and spacing of the limiting members are determined according to the position arrangement of the auxiliary box girder, and can meet the load of the precast concrete beam.

[0058] The limiting components are limiting angle steels 041, which are respectively arranged on the main box beam 024 and the auxiliary box beam 023 to limit the movement of the auxiliary box beam. A pair of limiting angle steels on the main box beam 024 fits with the two side surfaces of the auxiliary box beam, and a pair of limiting angle steels on the auxiliary box beam 023 fits with at least the opposite side surfaces of the two main box beams.

[0059] Specifically, in this embodiment, the auxiliary box beam 023 and the main box beam 024 are orthogonally embedded in each other, so a limit angle steel is set at the contact position of each main box beam and auxiliary box beam to limit the mutual movement of the two, and the two limit angle steels are arranged in a pair with relative spacing;

[0060] Specifically, five pairs of limit angles are welded to the upper surface of each main box girder 024 at regular intervals along the transverse direction to secure the five auxiliary box girders and prevent them from sliding laterally. A pair of limit angles is installed on the lower surface of each auxiliary box girder 023 where it intersects with the main box girder 024, limiting their longitudinal sliding. These limit angles are located on the opposing inner surfaces of the two main box girders. Alternatively, a pair of limit angles 041 can be installed on both sides of the lower surface of the auxiliary box girder where it intersects with each main box girder.

[0061] When the five auxiliary box girders and the two main box girders intersect and fit together up and down, the two side surfaces of each auxiliary box girder are just embedded in a pair of angle steels on the main box girder and fit together with the outer surface of the limit angle steel. The two side surfaces of the main box girder are just embedded in a pair of limit angle steels on the auxiliary box girder and fit together with the outer surface of the limit angle steel.

[0062] As a preferred embodiment, the limiting member may also be a limiting column and a limiting hole. That is, a limiting column is fixed on the upper surface of the main box girder where the main box girder 024 contacts the auxiliary box girder 023, and a limiting hole is provided on the lower surface of the auxiliary box girder where the auxiliary box girder contacts the main box girder. The limiting hole may be a blind hole. When the auxiliary box girder and the main box girder contact each other from top to bottom, the limiting column is inserted into the limiting hole.

[0063] Of course, the limiting hole can also be selected as follows: the limiting hole passes through the upper and lower surfaces of the auxiliary box beam, and the limiting column is inserted into the limiting hole, and the upper end surface of the limiting column does not exceed the upper surface of the auxiliary box beam.

[0064] Of course, another option for setting the limiting columns and limiting holes is: limiting holes can be opened on the main box girder, and the limiting columns are then set on the lower surface of the auxiliary box girder to also achieve the limiting effect.

[0065] Furthermore, the two outer ends of each auxiliary box beam 023 and the inner ends of the corresponding auxiliary secondary box beam 021 are hinged, locked or separated by a rotating shear locking assembly 022. The rotating shear locking assembly includes a hinge component, a shear component and a locking component, and the shear component and the locking component are both arranged on the hinge component.

[0066] The hinged component of the rotating shear locking assembly 022 can realize the folding and hinged connection and unfolding and straightening of the auxiliary box beam end and the auxiliary secondary box beam end in the horizontal direction. The shear component can realize the auxiliary box beam end and the auxiliary secondary box beam end being fixed as one when the auxiliary box beam end and the auxiliary secondary box beam end are unfolded and straightened in the horizontal direction, and is used to transmit the internal shear force of the auxiliary secondary box beam, that is, the shear force of the auxiliary secondary box beam in the rotating area of ​​the left and right ends of the auxiliary secondary box beam is transmitted to the middle auxiliary box beam through the shear component when the auxiliary secondary box beam is in the extended state; the locking component is used to connect and fix the auxiliary secondary box beam and the auxiliary box beam in a overlapping and docking state when the auxiliary secondary box beam is in the extended state, or to fix the auxiliary secondary box beam and the auxiliary box beam in a parallel folded state when the auxiliary secondary box beam is horizontally folded.

[0067] Furthermore, the hinged component includes a secondary beam end plate 0221 arranged at the end of the secondary box beam and a secondary secondary beam end plate 0222 arranged at the end of the secondary box beam. The secondary beam end plate 0221 and the secondary secondary beam end plate 0222 are both provided with hinged protrusions 0223 on the edges on one longitudinal side. The hinged protrusions 0223 are adjacent to each other in the upper and lower parts by pins 0224 or bolts.

[0068] Specifically, in this embodiment, the auxiliary beam end plate 0221 of the hinged component is welded to the end of the auxiliary box beam, and the auxiliary secondary box beam end plate 0222 is welded to the end of the auxiliary secondary box beam. The auxiliary beam end plate and the auxiliary secondary beam end plate have the same structure. The two auxiliary beam end plates and the auxiliary secondary beam end plates are hinged by two hinged protrusions 0223 and a pin 0224 on one side of the end plate. The hinged protrusion is a steel ear plate with a hole, and the pin is a steel pin. A steel pin is welded to each end of the hinged end of the auxiliary beam end plate and the auxiliary secondary beam end plate. Ear plates, steel ear plates protrude outward from the surface of the auxiliary beam end plate and the auxiliary secondary beam end plate respectively, and the steel ear plates of the auxiliary beam end plate and the steel ear plates of the auxiliary secondary beam end plate are arranged adjacent to each other up and down, and the holes on the steel ear plates of the auxiliary beam end plate on the lower side are threaded holes, and threads are set at the lower ends of the steel pins, which can be connected to the steel ear plates of the auxiliary beam end plate through threads, so that the auxiliary secondary beam end plate can be rotated 180 degrees inward around the horizontal plane of the steel pins to fit with the auxiliary beam end plate, so that the auxiliary secondary box beam and the auxiliary box beam are connected to each other.

[0069] Furthermore, the shear member includes a grooved shear pin 0227 and a double socket 0228 that engages with the grooved shear pin 0227. The grooved shear pin can be inserted into or out of the double socket. The double socket 0228 is provided through the outer end surface of the auxiliary beam end plate 0221 and the auxiliary secondary beam end plate 0222 on the side opposite to the hinge protrusion 0223.

[0070] Specifically, in this embodiment, the shear member is arranged on the end plate surface of the other side of the hinged member on the auxiliary beam end plate 0221 and the auxiliary secondary beam end plate 0222, and the double sockets 0228 are opened on the plate surfaces of the auxiliary beam end plate and the auxiliary secondary beam end plate, and pass through the plate surfaces of both. The grooved shear pin 0227 is a Π-shaped structural pin. The grooved shear pin includes two pin columns and a groove block connected to the end of the pin column to form a Π-shaped structure. The grooved shear pin is inserted into the double socket to realize shear force transmission, that is, the shear force of the auxiliary secondary box beam in the left and right end rotation areas of the auxiliary secondary box beam in the extended state is transmitted to the auxiliary box beam in the middle section through the auxiliary secondary beam end plate-groove shear pin-auxiliary beam end plate. After the grooved shear pin is inserted into the two layers of auxiliary beam end plates and the auxiliary secondary beam end plates, there is still a certain length margin, and the grooved shear pin port has a chamfer to facilitate positioning when inserting the shear pin. The design of the Π-shaped structure is convenient for manual insertion and extraction.

[0071] Furthermore, the locking component includes a pair of locking columns 0225 and a locking hook 0226, and the locking hook 0226 can be hung and involved in or detached from the locking column 0225; the locking columns are arranged on the outer plate surface of the auxiliary beam end plate and the outer plate surface of the auxiliary secondary beam end plate on the side of the hinged protrusion 0223, and the locking hook is hung on one of the locking columns; the locking column 0225 is arranged on the end of the auxiliary beam end plate 0221 and the end of the auxiliary secondary beam end plate 0222 on the side opposite to the hinged protrusion 0223, and the locking hook 0226 is hung on one of the locking columns.

[0072] Specifically, in this embodiment, the locking components include locking posts welded to the plane of the auxiliary secondary beam end plate or the auxiliary beam end plate, and locking hooks 0226 that fit over any locking posts 0225 of the auxiliary secondary beam end plate or the auxiliary beam end plate. The locking posts are welded studs, and the locking hooks are gravity-loaded hooks. Two sets of locking components are provided on a pair of hinged auxiliary secondary beam end plates 0222 and auxiliary beam end plates 0221.

[0073] The first set of locking components is installed on the auxiliary secondary beam end plate and the auxiliary beam end plate on the same side of the hinge member, and is located below the hinge member. The first set of locking components includes a first rivet welded to the outer side of the auxiliary beam end plate on one side of the hinge member, a second rivet welded to the outer side of the auxiliary secondary beam end plate, and a first gravity hook mounted on the second rivet. When the auxiliary secondary box beam folds inward and becomes parallel to the auxiliary box beam, the first gravity hook is hooked on the first rivet to maintain the auxiliary secondary box beam in the folded 180-degree position. Under the action of gravity, the first gravity hook continuously keeps the auxiliary secondary box beam in the folded and locked state.

[0074] The second set of locking components is located on the same side of the shear member as the auxiliary beam end plate and the auxiliary secondary beam end plate, locking the auxiliary secondary box girder in its extended state. Flush with the shear member, the second set of locking components consists of a third welded stud on the end of the auxiliary secondary beam end plate on one side of the shear member, a fourth welded stud on the end of the auxiliary beam end plate, and a second gravity hook attached to the fourth weld. When the auxiliary secondary box girder extends outward to overlap and dock with the auxiliary box girder, the second gravity hook is attached to the third welded stud to maintain the auxiliary secondary box girder in its extended state. Under the action of gravity, the second gravity hook continuously maintains the extended and locked state of the auxiliary secondary box girder.

[0075] Furthermore, when the auxiliary beam end plate 0221 and the auxiliary secondary beam end plate 0222 are hingedly fitted, the grooved shear pin 0227 is inserted into the double hole 0228 and the locking hook 0226 located on the opposite side of the hinged protrusion 0223 is hung on the locking column 0225 so that the auxiliary secondary box beam 021 and the auxiliary box beam 023 are relatively connected. When the auxiliary beam end plate 0221 and the auxiliary secondary beam end plate 0222 are hingedly separated; the grooved shear pin 0227 is disengaged from the double hole 0228 and the locking hook 0226 located on the same side of the hinged protrusion 0223 is hung on the locking column 0225 so that the auxiliary secondary box beam 021 and the auxiliary box beam 023 are folded and connected.

[0076] Furthermore, adjacent foldable telescopic columns in each row of the foldable telescopic column group are laterally connected to each other via a telescopic support rod 033; the foldable telescopic column includes a support short section 031, a foldable short section group and a telescopic short section 034 that are hinged up and down in sequence.

[0077] Specifically, the column structure of this embodiment includes two rows of foldable telescopic columns, totaling four columns. The upper ends of each pair of foldable telescopic columns support the ends of a main box girder 024, and the two foldable telescopic columns are connected horizontally by telescopic struts 033. The foldable telescopic columns are divided into four parts along the height direction: from top to bottom, they are: a support pup 031, a pair of upper foldable pup sections, a foldable pup section group consisting of the upper foldable pup sections, and a telescopic pup section 034.

[0078] Furthermore, the support short section 031 includes an upper support plate 0311 and a lower support plate 0313 which are arranged in parallel and spaced apart from each other. The upper support plate and the lower support plate are connected by a support tube 0312, and a threaded hole is provided at the center of the lower support plate 0313 which passes through the support tube 0312; the upper end portion of the upper support plate 0311 is provided with a limiting member for limiting the lateral movement of the main box beam 024, and a pull ring 042 opposite to the limiting member is provided on the lower support plate 0313 of at least the support short section located at the outermost side of the folding telescopic column group; the limiting member is a limiting angle steel 041, and the limiting angle steel 041 is provided at the upper end portion of the upper support plate 0311 for limiting the lateral movement of the main box beam 024, and the limiting angle steel on the upper support plate 0311 is in contact with the two side surfaces of the main box beam 024.

[0079] Specifically, in this embodiment, the support tube 0312 of the support pup 031 is a circular steel tube, the limiting angle steel 041 is a pair of L-shaped structural angle steels, and the upper support plate 0311 and lower support plate 0313 are square steel plates. The side length of the square steel plates is greater than the outer diameter of the circular steel tube to allow space for the hinge assembly, locking assembly, and pull ring. The support pup is welded to the upper support plate, the lower support plate, and the support tube to form the main body. A pair of limiting angle steels is welded to the upper surface of the upper support plate of each support pup to prevent lateral sliding of the main box girder. The center of the pair of limiting angle steels is located at the center of the upper support plate and aligned with the center of the support tube cross section. When the main box girder 024 is installed on the upper support plate 0311, the pair of limiting angle steels 041 are located on both sides of the main box girder and are aligned with the two sides of the main box girder. A pull ring is welded to the outer side of the lower support plate of the support pup. The pull ring is a gate-shaped member used for temporary connection to the π-shaped main box girder. The temporary connection can control the elevation of the lower support plate at the lower end of the support short section, thereby controlling the folding degree and folding state of the entire support device.

[0080] As a preferred embodiment, the limiting members on the support pup section may also be limiting posts and limiting holes. That is, a limiting post is fixed to the upper surface of the upper support plate of the support pup section where it contacts the main box girder, and a limiting hole is provided on the lower surface of the main box girder where it contacts the upper support plate. The limiting hole may be a blind hole. When the main box girder and the upper support plate are in contact from top to bottom, the limiting post is inserted into the limiting hole.

[0081] Of course, the limiting hole can also be selected as follows: the limiting hole passes through the upper and lower surfaces of the main box beam, and the limiting column is inserted into the limiting hole, and the upper end surface of the limiting column does not exceed the upper surface of the main box beam.

[0082] Of course, another option for setting the limit columns and limit holes is: a limit hole can be provided on the upper support plate, and in this case the limit columns are provided on the lower surface of the main box beam to also achieve the limiting effect.

[0083] Furthermore, the folding short section group includes at least one pair of folding short sections 032 hinged to each other, each of the folding short sections includes a folding column 0321, the upper end of the folding column 0321 is provided with an upper folding plate 0322, and the lower end is provided with a lower folding plate 0323, and the pair of folding short sections are hinged to each other through the upper folding plate and the lower folding plate, and the upper folding plate at the uppermost end of the folding short section group is hinged to the lower support plate 0313.

[0084] Specifically, the folding pup section group of this embodiment is composed of a pair of upper folding pup sections and lower folding pup sections that are folded and hinged up and down. The upper folding pup section and the lower folding pup section both include a folding column 0321, an upper folding plate 0322 and a lower folding plate 0323. The folding column 0321 is a circular steel pipe, and the upper folding plate 0321 and the lower folding plate 0322 are square steel plates. The side lengths of the upper folding plates and the lower folding plates are greater than the outer diameter of the folding column steel pipe. The upper folding plates and the lower folding plates are welded to the upper and lower ends of the folding column respectively.

[0085] Furthermore, the telescopic short section 034 includes a support screw 0344, and the support screw 0344 is sleeved with a support plate and an adjusting nut 0343. The support plate includes a support ring plate 0341 and a hollow tube 0342 connected to the lower plate surface of the support ring plate. The support plate is hinged to the lower folding plate 0323 at the lower end of the folding short section group.

[0086] Specifically, the support screw 0344 of the telescopic sub 034 of this embodiment is a threaded tube, the hollow tube 0342 is a circular steel tube, and the support ring plate 0341 is formed by a square steel plate with a through hole in the center. The support ring plate 0341 and the hollow tube 0342 are welded together. A flange is welded to the lower end of the hollow tube 0342. The outer diameter of the flange is larger than the outer diameter of the adjustment nut to facilitate the adjustment of the nut to support the support plate. The hollow tube and the threaded tube are coaxially arranged vertically. The cross-sectional dimensions of the hollow tube are the same as those of the upper folding sub or the upper folding sub. The outer diameter of the threaded tube is smaller than the inner diameter of the hollow tube and the inner diameter of the support ring plate. The adjustment nut is a hexagonal steel plate with internal threads. The adjustment nut 0343 is sleeved onto the support screw 0344 at the lower end of the support plate. A square steel support base plate 0345 is also welded to the bottom of the support screw 0344 to increase the load-bearing area of ​​the entire device. The adjusting nut 0343 is threadedly connected to the supporting screw 0344 and can rotate and move up and down along the axis of the supporting screw to adjust the height of the entire supporting plate.

[0087] Furthermore, when the foldable telescopic column is fully extended, the end of the support screw 0344 is received in the support plate, and the adjusting nut 0343 is threadedly connected to the support screw 0344 and supports the support plate; when the foldable telescopic column is folded and contracted, the end of the support screw 0344 passes through the support plate of the telescopic short section and is received in the support tube 0312 of the support short section, and the lower support plate 0313 of the support short section is threadedly connected to the support screw 0344, and the support screw 0344 supports the lower support plate 0313.

[0088] Specifically, in this embodiment, when the foldable telescopic column is extended and the pair of foldable short sections are straightened, the top end of the support screw 0344 is received in the cavity of the hollow tube 0342, and the upper load is transferred to the flange of the hollow tube of the telescopic short section. The load is then transferred from the adjusting nut 0343 to the support screw 0344 through the flange interface extrusion contact. The height of the foldable telescopic column can be adjusted by rotating the adjusting nut 0343. When the foldable telescopic column is fully folded and a pair of folding short sections are retracted and located below the upper end surface of the telescopic short section, the end of the support screw 0344 passes through the support plate of the adjusting nut 0343 and the lower support plate of the support short section and is received in the support tube 0312 of the support short section, and the support screw 0344 is threadedly connected to the threaded hole of the lower support plate 0313 of the support short section. At this time, the upper load is transmitted to the support short section 031 at the upper end of the foldable telescopic column, and is directly transmitted to the support screw through the threaded connection between the lower support plate of the support short section and the support screw.

[0089] Furthermore, the support pup sections 031 of adjacent foldable telescopic columns in each row of foldable telescopic column groups, or the foldable pup section groups, and the telescopic pup sections 034 are all laterally interconnected via the telescopic support rod 033. The telescopic support rod 033 includes a rotating sleeve 0331 and a threaded rod 0332 threadedly connected to both ends of the rotating sleeve. The outer ends of the threaded rods are each provided with a lug groove 062 with a hole. The lugs 061 are embedded in the lug groove 062 and are hinged via pins 0224 or bolts. The internal threads at both ends of the rotating sleeve are in opposite directions. When the rotating sleeve is rotated, the threaded rods at both ends simultaneously extend or retract into the ends of the rotating sleeve.

[0090] Specifically, in this embodiment, the rotating sleeve of each telescopic support rod is a hexagonal sleeve, and an external thread is provided at the connection part between the threaded rod and the hexagonal sleeve. The two threads are in opposite directions, and the two ends of the hexagonal sleeve have internal threads in opposite directions. By rotating the hexagonal sleeve in one direction, the threaded rods at both ends can be tightened or loosened.

[0091] Furthermore, the lower support plate edges of adjacent support pup sections 031 on each row of foldable telescopic column groups have lugs 061 with holes, and the lugs 061 of adjacent lower support plates are connected by telescopic struts 033; the opposite upper folding plate edges or lower folding plate edges of adjacent folding pup sections on each row of foldable telescopic column groups have lugs 061 with holes, and the lugs of opposite upper folding plates or lower folding plates on adjacent folding pup sections are connected by telescopic struts 033; the support ring plate edges of adjacent telescopic pup sections 034 on each row of foldable telescopic column groups have lugs 061 with holes, and the lugs of adjacent support ring plates are connected by telescopic struts 033.

[0092] Specifically, in this embodiment, the two foldable telescopic columns of each row of the foldable telescopic column group are connected into a whole in the transverse direction by three telescopic struts arranged above and below. The inner sides of the support short sections of adjacent foldable telescopic columns are connected by a telescopic strut, that is, a steel lug is longitudinally welded on the inner side of the lower support plate of each support short section, and the lugs of the two lower support plates are respectively nested in the lug grooves of the threaded rods at both ends of the telescopic strut and connected by pins or bolts.

[0093] The inner sides of the upper and lower ends of a pair of folding short sections of adjacent folding telescopic columns are connected by a telescopic strut 033, that is, a steel lug is longitudinally welded on the inner sides of the lower folding plate of the upper folding short section and the lower folding plate of the lower folding short section respectively, and the lugs 061 of the lower folding plates of the two upper folding short sections are respectively nested in the lug grooves 062 of the threaded rods at both ends of the telescopic strut and connected by pins or bolts, and the lugs of the lower folding plates of the two lower folding short sections are respectively nested in the lug grooves 062 of the threaded rods 0332 at both ends of the telescopic strut 033 and connected by pins or bolts.

[0094] As a preferred embodiment, the connection of the telescopic struts can also be selected as follows: the upper support plates or lower support plates of adjacent support short sections on each row of folding telescopic column groups, the upper folding plates or lower folding plates on the folding short section groups, and the support ring plates on the telescopic short sections can all or any group be connected laterally through the telescopic struts.

[0095] As a preferred embodiment, the connection of the telescopic struts can also be selected as follows: two telescopic struts can be set between the upper support plates or lower support plates of adjacent support short sections, between the upper folding plates or lower folding plates on the folding short section group, and between the support ring plates on the telescopic short sections. At this time, two lugs on the upper support plate or lower support plate, the upper folding plate or lower folding plate, and the support ring plate need to be provided to match the two telescopic struts, and the two telescopic struts are set parallel to each other.

[0096] Furthermore, the upper and lower adjacent lower support plates 0313 of each folding telescopic column are hinged to the upper folding plate 0322 on the longitudinal inner edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent lower support plates 0313 and the upper folding plate 0322 on the longitudinal outer plate surface; the upper and lower adjacent support ring plates 0341 of each folding telescopic column are hinged to the lower folding plate 0323 on the longitudinal inner edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent support ring plates 0341 and the lower folding plate 0323 on the longitudinal outer plate surface; a pair of upper and lower adjacent upper folding plates 0322 and the lower folding plate 0323 on each folding short section group are hinged to the upper and lower adjacent upper folding plates 0322 and the lower folding plate 0323 on the longitudinal outer edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent upper folding plates 0322 and the lower folding plate 0323 on the longitudinal inner plate surface.

[0097] Specifically, in this embodiment, in order to ensure that the two rows of foldable telescopic column groups are folded and contracted at the same time, a pair of folding short sections of the two rows of foldable telescopic column groups are folded and contracted inwardly at the same time to form a "><" shape. The hinge assembly includes three groups, and the three groups of hinge assemblies are arranged on the foldable telescopic column in sequence from top to bottom. The first group of hinge assemblies is arranged on the lower support plate of the support short section and the inner edge of the upper folding plate of the upper folding short section, the second group of hinge assemblies is arranged on the lower folding plate of the upper folding short section and the inner edge of the upper folding plate of the lower folding short section, and the third group of hinge assemblies is arranged on the lower folding plate of the lower folding short section and the inner edge of the support ring plate of the telescopic short section.

[0098] To ensure that both rows of foldable telescopic columns extend and stand upright simultaneously, the hinged support pup section 031, a pair of foldable pup sections 032, and telescopic pup section 033 are locked vertically when in the extended upright position by a locking assembly located on the other side of the hinge assembly. These locking assemblies also comprise three groups, arranged sequentially from top to bottom on the foldable telescopic columns and opposite the hinge assembly. The first group is located between the lower support plate of the support pup section and the outer surface of the upper foldable plate of the upper foldable pup section; the second group is located between the lower foldable plate of the upper foldable pup section and the outer surface of the upper foldable plate of the lower foldable pup section; and the third group is located between the lower foldable plate of the lower foldable pup section and the outer surface of the support ring plate of the telescopic pup section.

[0099] Furthermore, the hinge assembly includes at least one pair of hinge ears 071 and hinge ear slots 072, the hinge ears 071 and hinge ear slots 072 are nested in each other, the hinge ears and hinge ear slots are connected by bolts or pins, and the hinge ears 071 and hinge ear slots 072 are staggered on the edges of the upper and lower adjacent lower support plates 0313 and upper folding plates 0322, the edges of the upper and lower adjacent support ring plates 0341 and lower folding plates 0323, and the edges of the upper and lower folding plates 0322 and lower folding plates 0323; the locking assembly includes at least one pair of locking pins 051 and locking holes 052, the locking pin 051 can be embedded in or disengaged from the locking hole 052; the locking pin and the locking hole are also staggeredly arranged on the upper and lower adjacent surfaces of the lower support plate 0313 and the upper folding plate 0322, the upper and lower adjacent surfaces of the support ring plate 0341 and the lower folding plate 0323, and the upper and lower adjacent surfaces of the upper folding plate 0322 and the lower folding plate 0323; when the folding telescopic column is straightened, the locking pin is inserted into each locking hole 052, and when the folding telescopic column is contracted, the locking pin 051 is disengaged from the locking hole 052.

[0100] In this embodiment, specifically, the hinge assembly includes a pair of hinge ears 071 and a hinge ear slot 072. The hinge ear slot is welded by two spaced-apart ear plates with holes. The hinge ear 071 is an ear plate with holes. An ear plate is inserted between the two ear plates and connected by a steel pin or bolt. The hole on the ear plate on the lower side of the hinge ear slot is a threaded hole. The lower end of the pin or bolt is provided with an external thread. The pin or bolt is inserted into the hinge ear 071 and the hinge ear slot 072 and is threadedly connected to the lower side of the hinge ear slot. The hinge ear and the hinge ear slot can rotate around the pin or bolt at a maximum angle of 180 degrees.

[0101] A first hinge ear protruding outward is welded on the inner edge of the lower support plate of the support short section, and a first hinge ear groove protruding outward is welded on the inner edge of the upper folding plate of the upper folding short section. A first pin is arranged in the first hinge ear and the first hinge ear groove to form a first set of hinge components.

[0102] A second hinged ear protruding outward is welded to the inner edge of the lower folding plate of the upper folding short section, and a second hinged ear groove protruding outward is welded to the inner edge of the upper folding plate of the lower folding short section. A second pin is arranged in the second hinged ear and the second hinged ear groove to form a second set of hinged components.

[0103] A third hinged ear protruding outward is welded on the inner edge of the lower folding plate of the lower folding short section, and a third hinged ear groove protruding outward is welded on the inner edge of the supporting ring plate of the telescopic short section. A third pin is arranged in the third hinged ear and the third hinged ear groove to form a third set of hinged components.

[0104] Specifically, in this embodiment, the locking assembly comprises a pair of locking pins 051 and locking holes 052, each positioned opposite the hinge assembly. The locking pins 051 are a pair of circular steel posts with hexagonal heads, while the locking holes 052 are a pair of through-holes formed in the corresponding panels. When the upper and lower panels are aligned, the locking pins are coaxial with the corresponding through-holes, allowing for sufficient length for insertion. The ends of the locking pins are chamfered to facilitate positioning during insertion.

[0105] A first locking pin that passes through the lower support plate is provided on the outer plate surface of the lower support plate 0313 of the support short section 031, and a pair of through first locking holes are opened on the outer plate surface of the upper folding plate 0322 of the upper folding short section. When the lower support plate 0313 and the upper folding plate 0322 are fitted together, the first locking pin is inserted into the first locking hole to form a first group of locking components, and the first group of locking components is arranged opposite to the first hinge component.

[0106] A second locking pin that passes through the lower support plate is provided on the outer plate surface of the lower folding plate 0323 of the upper folding short section, and a pair of second locking holes that pass through are opened on the outer plate surface of the upper folding plate 0322 of the lower folding short section. When the lower folding plate and the upper folding plate are attached, the second locking pin is inserted into the second locking hole to form a second group of locking components, and the second group of locking components is arranged opposite to the second hinge component.

[0107] A third locking pin that passes through the lower support plate is provided on the outer plate surface of the lower folding plate 0323 of the lower folding short section, and a pair of through third locking holes are opened on the outer plate surface of the support ring plate 0341 of the telescopic short section. When the lower folding plate and the support ring plate are in contact with each other, the third locking pin is inserted into the third locking hole to form a third group of locking components. The third group of locking components is arranged opposite to the third hinge component.

[0108] As a preferred embodiment, the locking assembly may further include: locking holes formed through the surfaces of the upper and lower support plates 0313 and upper folding plates 0322, the upper and lower support ring plates and lower folding plates, and the upper and lower folding plates; when the foldable telescopic column is extended, a locking pin is inserted into each locking hole; when the foldable telescopic column is retracted, the locking pin is released from the locking hole. After assembly, the locking assembly of this structure secures the upper plate surface without removal, whether in the extended or folded state. Specifically, a pair of through-going first locking holes are formed on the outer surfaces of the lower support plate of the support stub and the upper folding plate of the upper folding stub, and a first locking pin is inserted into the first locking hole to form a first locking assembly. The first locking assembly is disposed opposite the first hinge assembly. A pair of through-going second locking holes are formed on the outer surfaces of the lower folding plate of the upper folding stub and the upper folding plate of the lower folding stub, and a second locking pin is inserted into the second locking hole to form a second locking assembly. The second locking assembly is disposed opposite the second hinge assembly. A pair of through third locking holes are opened on the outer plate surface of the lower folding plate of the lower folding short section and the supporting ring plate of the telescopic short section, and the third locking pins are inserted into the third locking holes to form a third group of locking components. The third group of locking components is arranged opposite to the third hinge component.

[0109] When the support device of the present invention is in operation, the construction operation process of the support device from being fully folded to being fully extended includes the following steps:

[0110] 1) First, install the two main box girders of the π-shaped composite beam on the temporary pier.

[0111] 2) Assemble the column structure, beam grid structure and formwork structure of the support device in the designated position in sequence; at this time, the column structure remains completely folded, the telescopic support rods are tightened, the secondary box beams are retracted, and the folding area formwork is moved to the shelf formwork and placed. At this time, the top of the formwork structure is lower than the height of the temporary pier.

[0112] 3) Temporarily connect the two main beams of the gate-shaped pull ring of the column structure and the π-shaped composite beam; pull and lift the extension template structure and the beam grid structure through the temporary connection, and at the same time rotate the adjusting nut at the lower end of the foldable telescopic column until the top of the support screw is stored in the upper hollow tube.

[0113] 4) Continue to use temporary connections to pull and lift the formwork structure and the beam grid structure, and gradually unfold the pair of folding short sections in the middle of the vertical folding telescopic column to the extended state.

[0114] 5) Use the locking pin of the locking assembly to fix it on the locking hole to make the column structure reach the extended state.

[0115] 6) Unlock the rotating secondary box girder and rotate it horizontally to the extended state and lock it through the locking component.

[0116] 7) Move the folding area template to the auxiliary box girder and align it with the shelving area template. Fine-tune the length of the telescopic short section to adjust the height of the column structure to the specified elevation. At the same time, remove the temporary connection of the door-type pull ring.

[0117] 8) Carry out relevant work such as pouring bridge deck concrete on the formwork structure. Once the concrete reaches the design strength, the formwork structure can be removed.

[0118] The construction process of the support device of the present invention from fully extended to fully folded includes the following steps:

[0119] 1) Fine-tune the length of the telescopic short section to slightly lower the formwork structure and separate the formwork structure from the concrete.

[0120] 2) Move the folding area template and place it on the adjacent shelf area template.

[0121] 3) Unlock the secondary box girder of the rotating section and rotate it horizontally to the retracted state and lock it through the locking component.

[0122] 4) Pull out the locking pin of the extended column structure.

[0123] 5) The gate-shaped pull ring of the column structure and the two main box beams of the π-shaped composite beam are temporarily connected.

[0124] 6) Under the traction of the temporary connection, a pair of folding short sections of the column structure are controllably folded gradually to a fully folded state.

[0125] 7) Cooperate with the temporary connection traction and rotate the adjusting nut of the telescopic pup joint at the same time, so that the formwork structure and the beam grillage structure continue to descend until the top of the supporting screw of the telescopic pup joint is screwed into the threaded hole of the lower supporting plate of the supporting pup joint and is received in the supporting tube of the supporting pup joint. At this time, the top surface of the formwork structure is lower than the top surface of the temporary pier.

[0126] 8) Remove the temporary connection, move the prefabricated π-shaped beam sideways, and transport it away using a beam transport vehicle.

[0127] The support device of the present invention only needs to repeat the above two construction processes when prefabricating the next round of π-shaped composite beams.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A support device for the construction of integrally prefabricated π-shaped composite beam concrete, comprising a template structure, a beam grid structure, and a column structure arranged in sequence, characterized in that: The template structure includes a shelf area template and a folding area template arranged on both sides of the shelf area template; the beam grid structure includes at least two transversely arranged auxiliary box beams and at least two longitudinally arranged main box beams supported by upper and lower supports, and at least two ends of the auxiliary box beams on the two outer sides are hinged with auxiliary secondary box beams, the auxiliary box beams support the shelf area template, and the auxiliary secondary box beams extend outward to support the folding area template and the shelf area template to be arranged on the same horizontal plane; the column structure includes two rows of folding telescopic column groups arranged longitudinally opposite to each other, each row of folding telescopic column groups includes at least 2 transversely arranged folding telescopic columns, and the bottom surface of each end of each main box beam is supported by the upper end surface of the folding telescopic column, and the two rows of folding telescopic column groups are longitudinally folded and telescoped relative to each other to adjust the height of the template structure.

2. A support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 1, characterized in that: Adjacent foldable telescopic columns in each row of the foldable telescopic column group are laterally connected to each other via telescopic struts; the foldable telescopic column comprises a support short section, a foldable short section group, and a telescopic short section hinged in sequence up and down; the support short section comprises an upper support plate and a lower support plate arranged parallel to each other and spaced apart, the upper support plate and the lower support plate being connected by a support tube, the center of the lower support plate being provided with a threaded hole penetrating the support tube; The folding short section group includes at least one pair of folding short sections hinged to each other, each of the folding short sections includes a folding column, an upper folding plate is provided at the upper end of the folding column, and a lower folding plate is provided at the lower end, the pair of folding short sections are hinged to each other through the upper folding plate and the lower folding plate, and the upper folding plate at the uppermost end of the folding short section group is hinged to the lower support plate; The telescopic short section includes a support screw, a support plate and an adjusting nut are sleeved on the support screw, the support plate includes a support ring plate and a hollow tube connected to the lower plate surface of the support ring plate, and the support plate is hinged to the lower folding plate at the lower end of the folding short section group; when the folding telescopic column is fully extended and upright, the end of the support screw is received in the support plate, and the adjusting nut is threadedly connected to the support screw and supports the support plate; when the folding telescopic column is fully folded, the end of the support screw passes through the support plate and is received in the support tube, and the lower support plate is threadedly connected to the support screw.

3. A support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 2, characterized in that: The supporting short sections of adjacent folding telescopic columns on each row of the folding telescopic column groups, or the folding short section groups, or the telescopic short sections are all laterally connected to each other through the telescopic struts; a limiting member for limiting the movement of the main box beam is provided on the upper end of the upper support plate located on the supporting short section, and a plurality of limiting members for limiting the movement of the main box beam and the auxiliary box beam are provided on the main box beam and the auxiliary box beam.

4. A support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 3, characterized in that: A pull ring is provided on the lower support plate of at least the outermost support short section of the foldable telescopic column group; the edges of the lower support plates of adjacent support short sections on each row of the foldable telescopic column group have lugs with holes, and the lugs of adjacent lower support plates are connected by telescopic struts; the edges of the opposite upper folding plates or lower folding plates on adjacent folding short section groups on each row of the foldable telescopic column group have lugs with holes, and the lugs of the opposite upper folding plates or lower folding plates on adjacent folding short section groups are connected by telescopic struts; the edges of the support ring plates of adjacent telescopic short sections on each row of the foldable telescopic column group have lugs with holes, and the lugs of adjacent support ring plates are connected by telescopic struts.

5. The support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 4, characterized in that: The telescopic strut includes a rotating sleeve and a threaded rod threadedly connected to the two ends of the rotating sleeve. The outer ends of the threaded rods are provided with lug grooves with holes, and the lugs are embedded in the lug grooves and hinged by bolts; the internal threads at both ends of the rotating sleeve are opposite to each other, and when the rotating sleeve is rotated, the threaded rods at both ends extend or retract at the same time.

6. The support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 5, characterized in that: The upper and lower adjacent lower support plates of each of the folding telescopic columns are hinged to the upper folding plate on the longitudinal inner edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent lower support plates and the upper folding plate along the longitudinal outer plate surface; the upper and lower adjacent support ring plates of each of the folding telescopic columns are hinged to the lower folding plate on the longitudinal inner edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent support ring plates and the lower folding plate along the longitudinal outer plate surface; the upper and lower adjacent upper folding plates and the lower folding plate on each of the folding short section groups are hinged to the upper and lower adjacent lower folding plates on the longitudinal outer edge by a hinge assembly, and a locking assembly is provided on the upper and lower adjacent upper folding plates and the lower folding plate along the longitudinal inner plate surface.

7. The support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 6, characterized in that: The hinge assembly includes at least one pair of hinge ears and hinge ear grooves, the hinge ears and hinge ear grooves are nested up and down, the hinge ears and hinge ear grooves are connected by bolts, the hinge ears and hinge ear grooves are respectively staggered between the upper and lower adjacent edges of the lower support plate and the upper folding plate, the upper and lower adjacent edges of the support ring plate and the lower folding plate, and the upper and lower adjacent edges of the upper folding plate; the locking assembly includes at least one pair of locking pins and locking holes, the locking pins can be embedded in or disengaged from the locking holes; the locking pins and locking holes are also staggered between the upper and lower adjacent lower support plate and the upper folding plate surface, the upper and lower adjacent support ring plate and the lower folding plate surface, and the upper and lower adjacent upper folding plate and the lower folding plate surface; when the folding telescopic column is straightened, the locking pin is inserted into each of the locking holes, and when the folding telescopic column is retracted, the locking pin is disengaged from the locking hole.

8. The support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 7, characterized in that: The hinged auxiliary box beam end and the auxiliary secondary box beam end are hinged, locked or separated by a rotating shear locking assembly. The rotating shear locking assembly includes a hinge component, a shear component and a locking component. The shear component and the locking component are both arranged on the hinge component. The hinge component includes an auxiliary beam end plate arranged at the auxiliary box beam end and an auxiliary secondary beam end plate arranged at the auxiliary secondary box beam end. The auxiliary beam end plate and the auxiliary secondary beam end plate are both provided with hinge protrusions on the edges on one longitudinal side. The hinged protrusions are adjacent to each other above and below and are connected by pins; the locking component includes a pair of locking columns and locking hooks, and the locking hooks can be hung to be involved in or detached from the locking columns; the locking columns are provided on the outer plate surface of the auxiliary beam end plate and the outer plate surface of the auxiliary secondary beam end plate on one side of the hinged protrusion, and the locking hook is hung on one of the locking columns; the end of the auxiliary beam end plate and the end of the auxiliary secondary beam end plate on the side opposite to the hinged protrusion are provided with locking columns, and the locking hook is hung on one of the locking columns; the shear member includes a grooved shear pin and a double jack plugged into the grooved shear pin, and the groove The grooved shear pin can be inserted into or disengaged from the double holes, and the double holes are provided on the outer end surfaces of the auxiliary beam end plate and the auxiliary secondary beam end plate on the side opposite to the hinge protrusion; when the auxiliary beam end plate and the auxiliary secondary beam end plate are hingedly fitted, the grooved shear pin is inserted into the double holes and the locking hook located on the opposite side of the hinge protrusion is hung on the locking column so that the auxiliary secondary box beam and the auxiliary box beam are relatively connected; when the auxiliary beam end plate and the auxiliary secondary beam end plate are hingedly separated, the grooved shear pin is disengaged from the double holes and the locking hook located on the same side of the hinge protrusion is hung on the locking column so that the auxiliary secondary box beam and the auxiliary box beam are folded and connected.

9. The support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 8, characterized in that: The shelving area template is composed of several strip-shaped lightweight flat plates arranged adjacent to each other in sequence, and the folding area template is composed of at least one strip-shaped lightweight flat plate arranged. When the secondary box girder and the secondary box girder are folded and connected, the folding area template is set on the shelving area template.

10. The support device for the construction of integrally prefabricated π-shaped composite beam concrete according to claim 9, characterized in that: The limiting components are limiting angle steels, which are respectively arranged on the main box girder and the auxiliary box girder to limit the movement of the auxiliary box girder. The limiting angle steels on the main box girder are in contact with the two side surfaces of the auxiliary box girder, and the limiting angle steels on the auxiliary box girder are in contact with at least the opposite sides of the two main box girders; the limiting angle steels are arranged on the upper end of the upper support plate to limit the lateral movement of the main box girder, and the limiting angle steels on the upper support plate are in contact with the two side surfaces of the main box girder.

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