Modularized support and construction method of prefabricated bottom plate

Abstract

The invention relates to the technical field of prefabricated bottom plate construction, in particular to a modular support and a construction method of a prefabricated bottom plate. The formwork supporting frame comprises a plurality of formwork supporting basic units and dumbbell pins. The formwork supporting basic unit is of a multi-layer structure; the dumbbell pins penetrate through the gourd holes of the adjacent formwork supporting basic units, and all the formwork supporting basic units are combined into a whole. The construction method comprises the steps that the prefabricated bottom plate is stably placed on the adjustable bracket of the formwork support, and the prefabricated bottom plate is lifted to a working face from the ground in the mode that the formwork support and the prefabricated bottom plate are integrally lifted. The prefabricated bottom plate is almost free of the action of bending moment in the hoisting process, and the probability that the prefabricated bottom plate cracks is greatly reduced; after the prefabricated bottom plate is hoisted to a working face, the position of the prefabricated bottom plate can be conveniently, reliably and finely adjusted by adjusting the modular formwork support, precise positioning of the prefabricated top plate is facilitated, and the construction speed is increased.

Description

TECHNICAL FIELD

[0001] The application relates to the prefabricated floor construction technology field, in particular to a modular support and a prefabricated floor construction method. BACKGROUND

[0002] The assembled composite slab is a floor structure formed by stacking a prefabricated floor and a post-poured concrete layer. The core of the construction process is to realize the industrialized construction of the floor structure through the combination of the prefabricated floor and the cast-in-place composite layer. Compared with the traditional cast-in-place floor, it has the advantages of high construction efficiency, less on-site wet work, good structural integrity, etc. The prefabricated floor is usually prefabricated in a factory to achieve a certain strength and stiffness, then transported to the construction site, hoisted to the floor formwork frame for installation, and then poured with concrete layer to form an integral floor structure together with the prefabricated floor.

[0003] The assembled composite slab floor construction follows the sequence logic of "preparation → support erection → prefabricated floor installation → adjustment, node treatment → composite layer concrete construction → maintenance and acceptance". Among them, the main process of erecting support is: measuring and laying out the position of the vertical rod → laying the bottom plate of the vertical rod → erecting the vertical rod → sweeping the ground rod → erecting the longitudinal and horizontal rods → erecting the horizontal and vertical scissors → connecting the wall piece → continuing to erect the support of the previous step → placing the adjustable support on the upper end of the vertical rod → placing the load-bearing square wood block → checking the axis and elevation → waiting for the prefabricated floor to be hoisted and installed; The traditional support material generally uses a steel pipe with a diameter of 48.

[0004] The key points of prefabricated floor hoisting and installation construction are: ① hoisting method: select appropriate lifting tools and hoisting methods according to the size and weight of the composite slab, generally use multi-point hoisting to ensure the horizontal state of the hoisting plate and the uniform stress of the plate during hoisting, uniform hoisting speed, avoid sudden start and stop, and avoid stress concentration leading to plate cracking; ② slowly lift during hoisting, check whether the lifting point is stressed uniformly and the plate body is horizontal when the plate body is 500mm away from the ground, and continue to lift if there is no inclination; ③ hoist to about 300mm above the installation position, manually assist translation to avoid collision with the support or installed components; ④ slowly lower the plate to ensure that the plate edge is aligned with the layout position, and timely adjust the position and angle of the plate to ensure that the joint seams between the plates are uniform and consistent, and meet the design requirements.

[0005] The key points of prefabricated floor installation adjustment construction are: the planar position accuracy adjustment of the prefabricated floor after installation requires secondary hoisting, repeated translation, alignment and other operations; the flatness of the plate bottom is corrected by adjusting the height of the jacking.

[0006] There are some deficiencies in the hoisting and installation technology of precast base plates, mainly including the following: ① The extra bending moment during the hoisting movement of the precast base plate is difficult to control: Precast base plates are generally large in planar dimensions, with a thickness of about 70mm, which makes them appear thin. Prestressed reinforcement is generally used in the span direction, and non-prestressed structural reinforcement is configured in the other direction. The bending resistance in the non-prestressed reinforcement direction is weak. Although the lifting points can be evenly arranged, the stress concentration in the lifting point area and the bending in the non-prestressed reinforcement direction of the precast base plate will suddenly increase during the uneven lifting movement. Under the influence of various factors, the precast base plate is easily damaged and cracks are likely to occur. ② The installation efficiency is low and the safety risks are high: First, the precast base plate is hoisted to 300mm above the installation position and the installation workers hold it by hand while contacting and directing the hoisting driver to operate the crane to make fine adjustments. This is a sign of being out of reach, reflecting low technical level, high safety risks, and low construction efficiency. Secondly, after the prefabricated base plate lands, it often needs to be lifted again to fine-tune the plane position. This fine-tuning alignment method is difficult to grasp and has low controllability. In addition, the prefabricated base plate is inevitably flattened, and the horizontal force impacts the support frame, posing a construction safety risk.

[0007] Currently, there are two main types of support frames used in prefabricated composite slab construction. The first type utilizes a support system consisting of steel pipes, fasteners, adjustable brackets, and flattened square timber planks. This system features closely spaced columns, horizontal bars, and excellent frame stability. The square timber planks serve as supports for the prefabricated baseplate after installation, resulting in good contact and stability. However, the diverse materials used for the steel pipes and fasteners contribute to the frame's poor ability to resist horizontal forces, resulting in long erection and dismantling times and high labor costs. The second type utilizes a structure with independent adjustable steel supports and metal steel beams. This system allows for wider spacing between steel columns, which increases the cross-sectional dimensions of the steel beams atop the columns, requiring longer and heavier beams. However, using the steel beams directly as supports for the prefabricated baseplate after installation results in poor contact and stability. Furthermore, the beams' poor resistance to horizontal forces, heavy weight, and inconvenient handling during erection and dismantling contribute to poor contact and stability.

[0008] Therefore, it is necessary to provide an improved technical solution to the above-mentioned deficiencies in the prior art. Summary of the Invention

[0009] The purpose of this application is to provide a construction method of a modular bracket and a prefabricated base plate to solve or alleviate the problems existing in the above-mentioned prior art.

[0010] In order to achieve the above objectives, this application provides the following technical solutions: A modular bracket includes a formwork frame, which includes a plurality of formwork basic units and dumbbell pins; the formwork basic units include edge corner nodes arranged at the corner positions of the formwork basic units, edge middle nodes arranged in the middle of the edge lines of the formwork basic units, horizontal rods and vertical rods; the edge corner nodes and edge middle nodes are both rigid nodes; the formwork basic units are multi-layer structures, the edge corner nodes and edge middle nodes of each layer are fixed by means of horizontal rod sockets, and the edge corner nodes and edge middle nodes between the upper and lower layers are respectively fixed by means of vertical rod sockets; gourd holes are provided on the sides of the edge corner nodes and edge middle nodes, and the dumbbell pins pass through the gourd holes of adjacent formwork basic units to combine all the formwork basic units into one.

[0011] Furthermore, the edge corner node includes a first short tube, two second short tubes vertically fixed on the first short tube, and a first side angle plate fixed between the first short tube and the second short tube; the two second short tubes are vertically arranged; the gourd hole includes a first gourd hole opened on the first side angle plate; The edge mid-node includes a fifth short tube, three sixth short tubes vertically fixed on the fifth short tube, and a second side angle plate fixed between the sixth short tube and the fifth short tube; the three sixth short tubes are arranged in a T shape; the gourd hole includes a second gourd hole opened on the two outer second side angle plates.

[0012] Furthermore, the ends of the first short tube, the second short tube, the fifth short tube and the sixth short tube away from the intersection point are respectively provided with a plurality of pin holes, and both ends of the vertical pole and the horizontal pole are provided with positioning holes corresponding to the pin holes, and the vertical pole and the horizontal pole are fixed to the edge corner node and the edge mid-node by socket fixing and fixing through cross pin fasteners.

[0013] Furthermore, the top of the first short tube located at the edge corner node of the non-top layer is higher than the second short tube, and the top of the fifth short tube located at the edge mid-node of the non-top layer is higher than the sixth short tube; the tops of the first short tube and the fifth short tube are respectively provided with a plurality of pin holes.

[0014] Furthermore, the modular bracket also includes a plurality of adjustable brackets installed on the top of the formwork frame, and a plurality of universal wheels are provided on the bottom of the formwork frame.

[0015] The present invention also proposes a construction method for a prefabricated base plate using the aforementioned modular bracket, comprising the following steps: Step 1: Assemble a formwork frame on the ground; a plurality of adjustable brackets are provided on the top of the formwork frame; Step 2: Install the prefabricated base plate stably on the adjustable bracket, and set the slings and anti-fall cables; Step 3: Lift the prefabricated base plate and the formwork frame as a whole and place them on the working surface; Step 4: Move the formwork frame on the work surface, adjust the adjustable bracket, fine-tune the prefabricated base plate to the precise position, and use wedges to tighten the bottom of the formwork frame to fix the position of the formwork frame; Step 5. After completing the formwork task, lower the height of the adjustable support, move the formwork frame to a convenient space next to it, and remove it.

[0016] Furthermore, in the step 2, a square wooden slat is provided between the adjustable bracket and the prefabricated bottom plate, and the surface of the square wooden slat is wrapped with a rubber cushion layer.

[0017] Furthermore, in step one, the steps of assembling the formwork frame on the ground are: first assemble the formwork basic units, then place the formwork basic units in parallel and connect the gourd holes of adjacent formwork basic units with dumbbell pins; one of the formwork frames is composed of 2-4 formwork basic units, and the formwork basic units are a three-layer structure.

[0018] Furthermore, the assembly of the basic formwork unit includes the following steps: S1. Design the size of each layer's formwork basic unit after assembly based on the size of the prefabricated base plate; the shape of each layer's formwork basic unit is in the shape of a "sun"; S2. Assemble the upper bracket and the bottom bracket; the upper bracket includes 4 edge corner nodes, 2 edge mid-nodes, a layer of horizontal rods and a layer of vertical rods, and the bottom bracket includes 8 edge corner nodes, 4 edge mid-nodes, two layers of horizontal rods and a layer of vertical rods; S3. Fix the bottom end of the vertical rod of the upper bracket in the edge corner node and the edge middle node of the bottom bracket by socket insertion.

[0019] Compared with the closest prior art, the technical solution of the embodiment of the present application has the following beneficial effects: The modular bracket of the present invention has a simple material structure and low material cost. The components are mainly fixed by sockets, which is convenient for erection and disassembly. It is also convenient to adjust the size and height of the modular bracket. It can be lifted as a whole and is easy to transport, which can greatly save construction costs.

[0020] The modular brackets of the present invention are all rigid nodes, and the modular brackets do not need to be additionally provided with horizontal and vertical scissors braces after assembly; when dismantling, the basic formwork units are split by removing the dumbbell pins, and the overall height of the formwork frame is lowered by removing the cross pin fasteners of the socket vertical rods, so that the modular brackets can be separated and moved away, which is convenient and quick.

[0021] The construction method of the present invention first assembles the modular formwork frame on the ground, and then pre-installs the prefabricated base plate on the formwork frame for overall hoisting. During the hoisting process, the prefabricated base plate is almost not subjected to bending moment, which greatly reduces the probability of cracks in the prefabricated base plate. After hoisting to the working surface, the position of the prefabricated base plate can be conveniently and reliably fine-tuned by adjusting the modular formwork frame, which facilitates the precise positioning of the prefabricated top plate and speeds up the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings and descriptions that constitute part of this application are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. Among them: Figure 1 Schematic diagram of the simplified structure of the basic formwork unit according to an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the top view of the basic formwork unit according to an embodiment of the present invention.

[0024] Figure 3 2 is a side structural diagram of an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the simplified structure of the formwork frame according to an embodiment of the present invention.

[0026] Figure 5 Schematic diagram of the structure of the first corner node of an embodiment of the present invention.

[0027] Figure 6 Schematic diagram of the structure of the first node in an embodiment of the present invention.

[0028] Figure 7 This is a schematic structural diagram of the overall lifting of the prefabricated base plate and the formwork frame according to an embodiment of the present invention.

[0029] Description of reference numerals: 1-first corner node, 2-first middle node, 3-horizontal rod, 4-second corner node, 5-second middle node, 6-third corner node, 7-third middle node, 8-universal wheel, 9-vertical pole, 10-formwork frame, 11-formwork basic unit, 13-prefabricated bottom plate, 14-sling, 15-anti-fall steel cable, 101-first short tube, 102-second short tube, 103-third short tube, 104-first side angle plate, 105-first gourd hole, 106-fourth short tube, 107-first top angle plate, 201-fifth short tube, 202-sixth short tube, 203-seventh short tube, 204-second side angle plate, 205-second gourd hole, 206-eighth short tube, 207-second top angle plate. DETAILED DESCRIPTION

[0030] The application will be described in detail below with reference to the attached drawings and embodiments. Various examples are provided by way of explanation of the application but are not meant as a restriction of the application. In fact, it will be apparent to those skilled in the art that modifications and variations of the application can be made without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment, can be used with another embodiment to yield still a further embodiment. Thus, it is intended that this application encompass such modifications and variations of the application as come within the scope of the appended claims and their equivalents.

[0031] In the following description, the terms "first / second / third" are merely used to distinguish similar objects, and do not represent a specific order of the objects. Understandably, the "first / second / third" can be interchanged in a specific order or sequence as allowed, so that the embodiments of the application described herein can be implemented in an order other than that illustrated or described herein.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing the embodiments of the application only and is not intended to be limiting of the application.

[0033] In the description of the application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and do not require the application to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application.

[0034] As shown in Figures 1 to 7 A modular support includes a support formwork 10, the support formwork 10 includes a plurality of support formwork basic units 11 and dumbbell pins; the support formwork basic unit 11 includes an edge corner node arranged at a corner position of the support formwork basic unit 11, an edge middle node arranged at a middle position of an edge line of the support formwork basic unit 11, a horizontal rod 3 and a vertical rod 9; the edge corner node and the edge middle node are both rigid nodes; the support formwork basic unit 11 is a multi-layer structure, the edge corner nodes and the edge middle nodes of each layer are fixed by socketing through the horizontal rod 3, and the edge corner nodes and the edge middle nodes between the upper and lower layers are fixed by socketing through the vertical rod 9; the side surface of the edge corner node and the edge middle node is provided with a gourd hole, and the dumbbell pin passes through the gourd holes of adjacent support formwork basic units 11 to combine all the support formwork basic units 11 into one body.

[0035] The edge middle node and the edge corner node of the modular support frame of the present application are rigid nodes made of metal, the horizontal rods 3 and the vertical rods 9 are inserted into the edge middle node and the edge corner node and fixed by the cross pin metal pins, thereby forming a geometrically invariant three-dimensional frame unit; the size of the basic support frame unit 11 can be designed as required by setting the pin holes and the positioning holes and adjusting the length of the rod, and the basic support frame unit 11 is freely combined to form the support frame 10 as required.

[0036] As shown in Figure 2 , Figure 3 , Figure 5 , the edge corner node comprises a first short pipe 101, two second short pipes 102 vertically fixed on the first short pipe 101, a first side angle plate 104 fixed between the first short pipe 101 and the second short pipe 102, a third short pipe 103 fixed on the hypotenuse of the first side angle plate 104, a first top angle plate 107 fixed between the two second short pipes 102, and a fourth short pipe 106 fixed on the hypotenuse of the first top angle plate 107, the two second short pipes 102 are vertically arranged, the two ends of the third short pipe 103 are respectively fixed on the first short pipe 101 and the second short pipe 102, and the two ends of the fourth short pipe 106 are respectively fixed on the two second short pipes 102; the gourd hole comprises a first gourd hole 105 formed in the first side angle plate 104.

[0037] As shown in Figure 2 , Figure 3 , Figure 6 , the edge middle node comprises a fifth short pipe 201, three sixth short pipes 202 vertically fixed on the fifth short pipe 201, a second side angle plate 204 fixed between the sixth short pipe 202 and the fifth short pipe 201, a seventh short pipe 203 fixed on the hypotenuse of the second side angle plate 204, a second top angle plate 207 fixed between two adjacent sixth short pipes 202, and an eighth short pipe 206 fixed on the hypotenuse of the second top angle plate 207, the three sixth short pipes 202 are arranged in a T shape, the two ends of the seventh short pipe 203 are respectively fixed to the fifth short pipe 201 and the sixth short pipe 202, and the two ends of the eighth short pipe 206 are respectively fixed to the two vertically adjacent sixth short pipes 202; the gourd hole comprises a second gourd hole 205 formed in the outer two second side angle plates 204.

[0038] Further, as shown in Figure 2 , Figure 3 , Figure 5 , Figure 6As shown, the ends of the first short tube 101, the second short tube 102, the fifth short tube 201, and the sixth short tube 202 away from the intersection are respectively provided with a plurality of pin holes. The ends of the vertical rod 9 and the horizontal rod 3 are provided with positioning holes corresponding to the pin holes. The vertical rod 9 and the horizontal rod 3 are fixed to the edge corner nodes and the edge mid-node by means of sockets and fasteners; the pin holes are arranged in a triangular shape. The horizontal rod 3 can be sleeved on the outside of the second short tube 102 / the sixth short tube 202, or can be inserted into the second short tube 102 / the sixth short tube 202. By adjusting the overlapping length of the horizontal rod 3 and the second short tube 102 / the sixth short tube 202, the length and width of the formwork basic unit 11 can be adjusted. By adjusting the overlapping length of the vertical rod 9 and the fifth short tube 201, the floor height of the formwork basic unit 11 can be adjusted, thereby adjusting the height of the formwork basic unit 11. The cross pin fastener comprises a cross pin and a fastener detachably fixed to the end of the cross pin. For example, the cross pin can be a long bolt, and the fastener can be a hand-tightened nut matching the long bolt.

[0039] Furthermore, a plurality of adjustable supports are provided at the top of the formwork frame 10, and a plurality of universal wheels 8 are provided at the bottom of the formwork frame 10. The adjustable supports are of prior art, and include a support screw, a support fixed to the top of the support screw, and an adjusting nut threadedly connected to the support screw. The number of adjustable supports is 4-8, roughly corresponding to the positions of the four corners and the midpoints of the edges of the prefabricated base plate 13. The supports of the adjustable supports can be flat or U-shaped. Preferably, a U-shaped support is selected and matched with square wooden slats, and the surface of the square wooden slats is wrapped with a 3-5mm rubber pad. The prefabricated base plate 13 is directly supported on several adjustable supports, and the stress at each contact point is relatively concentrated. Using square wooden slats as pads between the adjustable supports and the prefabricated base plate 13 can avoid damage to the surface of the prefabricated base plate 13 that may be caused by stress concentration. During the production and transportation of the precast baseplate 13, slight warping or surface unevenness may occur. The square timber slats, with their inherent rigidity and length (matching the width of the baseplate), can span two or three adjustable supports. By adapting their deformation to minor unevenness in the baseplate, the rubber padding ensures full, gap-free contact between the baseplate and the square timber slats, evenly transferring the load to all adjustable supports and preventing single-point overload. The rubber padding cushions collisions and friction during lifting or adjustment, preventing damage to the concrete precast baseplate 13 caused by the metal supports. Furthermore, the rubber padding provides greater friction, effectively preventing the baseplate from sliding or shifting during lifting or support.

[0040] Further, such as Figures 1 to 7As shown, the formwork basic unit 11 is designed as three layers, and the edge corner nodes located in the upper layer, the middle layer and the lower layer are respectively denoted as the first corner node 1, the second corner node 4 and the third corner node 6; the edge middle nodes located in the upper layer, the middle layer and the lower layer are respectively denoted as the first middle node 2, the second middle node 5 and the third middle node 7. It should be noted that the calabash holes of each layer need to maintain the shape of being large at the top and small at the bottom. The second short pipe 102 of the first corner node 1 is welded and fixed at the top end or upper portion of the first short pipe 101, and the sixth short pipe 202 of the first middle node 2 is welded and fixed at the top end or upper portion of the fifth short pipe 201; in actual use, the first corner node 1 and the first middle node 2 are inserted with the support screw of the adjustable support. The second short pipe 102 of the second corner node 4 is welded and fixed at the middle upper portion of the first short pipe 101, and the part of the first short pipe 101 higher than the second short pipe 102 is denoted as a protruding section; the sixth short pipe 202 of the second middle node 5 is welded and fixed at the middle upper portion of the fifth short pipe 201, and the part of the fifth short pipe 201 higher than the sixth short pipe 202 is also denoted as a protruding section, and a plurality of pin holes corresponding to the positions of the positioning holes are arranged on the protruding section; the protruding section is arranged to facilitate the stable connection of the vertical rod 9 of the upper layer with the edge corner node or the edge middle node. Preferably, the pipe diameter of the lower end of the vertical rod 9 is larger than that of the first short pipe 101 / fifth short pipe 201, and in assembly, the protruding section is inserted into the vertical rod 9, and then connected and fixed by the cross pin fastener penetrating through the pin hole and the positioning hole. The third corner node 6 and the third middle node 7 are arranged in the lower layer and need to be installed with the universal wheel 8, the structure of the third corner node 6 is symmetrical to that of the second corner node 4, and the structure of the third middle node 7 is symmetrical to that of the second middle node 5.

[0041] The application also provides a construction method of a prefabricated floor using the aforementioned modular support, comprising the following steps: Step one, according to the size of the prefabricated floor 13, design a support 10 with a reasonable size according to relevant specifications and standards, and assemble the support 10 on the ground; the top of the support 10 is provided with a plurality of adjustable supports; Step two, the prefabricated floor 13 is previously manufactured by the factory and then transported to the project department yard by car, and the prefabricated floor 13 is smoothly transported to the adjustable supports of the support 10 assembled on the ground by the forklift / truck / crane of the project department, and the sling 14 and the anti-falling steel cable 15 are arranged, and after inspection, the whole is hoisted; the lower end of the sling 14 is hooked on the edge corner nodes of the four corners, and the anti-falling steel cable 15 is used for the anti-falling protection of the prefabricated floor 13, the upper end of the anti-falling steel cable 15 is connected to the sling 14, and the lower end of the anti-falling steel cable 15 is hooked on the prefabricated floor 13 or the support 10; preferably, in order to avoid damage caused by the direct hard contact of the adjustable support with the prefabricated floor 13, the adjustable support adopts a U-shaped support, and a square wooden block wrapped with a rubber pad layer is arranged on the adjustable support to support the prefabricated floor 13, and the square wooden block is arranged along the width direction of the prefabricated floor, and there are three square wooden blocks in total; Step three, the precast bottom plate 13 and the formwork support frame 10 are hoisted as a whole, and are hoisted to the working surface according to the hoisting procedures; Figure 7 The schematic diagram for hoisting the precast bottom plate 13 and the formwork support frame 10 as a whole; Step four, according to the design, the formwork support frame 10 is moved on the working surface, the adjustable support is adjusted, the precast bottom plate 13 is finely adjusted to the accurate position, and the wedge (such as triangular wood block, brick, concrete block, stone, etc.) is used to tightly fix the universal wheel 8 at the bottom of the formwork support frame 10 so that the position of the formwork support frame 10 is fixed; Step five, after the formwork task is completed, the height of the adjustable support or the height of the formwork support frame 10 is adjusted to be low, the wedge at the universal wheel 8 is removed, and the formwork support frame 10 is moved to the convenient space next to it and is removed.

[0042] The traditional method is to hoist the precast concrete bottom plate to the formwork system on the floor for installation. In order to change the traditional unsafe method, the formwork support frame 10 is designed as a modular support, which is assembled on the ground, and the precast bottom plate 13 is installed on the formwork support frame 10, and then the whole is hoisted to the construction floor for moving and splicing, which reduces the damage risk of the precast bottom plate 13 during hoisting and transportation, and is more safe and convenient to transport.

[0043] The method for reducing the height of the formwork support frame 10 is to reduce the overlapping length of the vertical rod 9 and the rigid node in step one, that is, to adjust the layer height of the formwork basic unit 11 to the maximum. Then, in step five, the horizontal pin fastener of the dumbbell pin and the socket vertical rod 9 is removed from top to bottom according to the formwork basic unit 11, and the second vertical rod 9 directly falls to the rigid node, thereby reducing the layer height of the formwork basic unit 11 and the overall height of the formwork support frame 10. By this method, the height of the formwork support frame 10 is reduced, which avoids the problem that the height of the traditional formwork support frame 10 is difficult to adjust after being set up once. Through the strategy of "high first and then low", the operation space is ensured to be sufficient during the construction process, and the flexible and accurate adjustment of the structure height is realized, which significantly improves the adaptability and construction efficiency of the formwork support frame 10, and is especially suitable for building scenes with frequent changes in layer height or limited headroom.

[0044] Further, in step one, the step of assembling the formwork support frame 10 on the ground is: first, assembling the formwork basic unit 11, then placing the formwork basic unit 11 in a flat row and connecting the adjacent formwork basic units 11 through the dumbbell pin; one formwork support frame 10 is composed of 2-4 formwork basic units 11, preferably, one formwork support frame 10 is composed of 3 formwork basic units 11; the formwork basic unit 11 is a three-layer structure.

[0045] This application pre-assembles basic formwork units 11 on the ground and then quickly connects them via dumbbell pins to form an integrated formwork frame 10, achieving modular, factory-prepared assembly and improving construction safety and assembly efficiency. The design, which combines 2-4 basic units (preferably 3), balances structural stability with ease of transportation and hoisting. The three-tiered structure facilitates adaptability to the construction height of each working surface while ensuring overall rigidity and load-bearing capacity.

[0046] Furthermore, the assembly of the basic formwork unit 11 includes the following steps: S1. Design the size of each layer of formwork basic unit 11 after assembly according to the size of the prefabricated base plate 13; the shape of each layer of formwork basic unit 11 is "日" shaped; S2. Assemble the upper bracket and the bottom bracket; the upper bracket includes 4 edge corner nodes, 2 edge mid-nodes, a layer of horizontal rods 3 and a layer of vertical rods 9, and the bottom bracket includes 8 edge corner nodes, 4 edge mid-nodes, two layers of horizontal rods 3 and a layer of vertical rods 9; S3, fixing the bottom end of the vertical rod 9 of the upper bracket to the edge corner node and the edge middle node of the bottom bracket; Figure 1-Figure 3 Schematic diagram of the structure of the assembled formwork basic unit 11; This application utilizes a modular combination of standardized edge corner nodes, edge midpoint nodes, and rods (horizontal rods 3 and vertical rods 9) to achieve rapid assembly and disassembly of the formwork basic unit 11, improving construction efficiency. The split design of the upper and lower brackets facilitates transport and reuse. The socket-and-socket connection, in which the upper bracket inserts into the edge corner nodes and edge midpoint nodes of the lower bracket, facilitates installation and provides a reliable connection, effectively improving structural integrity and stability while reducing reliance on high-precision welding or bolting, thereby lowering manufacturing and maintenance costs.

[0047] The foregoing description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are readily apparent to those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A modular bracket, characterized in that: The invention comprises a formwork frame (10), wherein the formwork frame (10) comprises a plurality of formwork basic units (11) and dumbbell pins; the formwork basic units (11) comprise edge corner nodes arranged at the corner positions of the formwork basic units (11), edge mid-nodes arranged at the middle of the edge lines of the formwork basic units (11), horizontal rods (3) and vertical rods (9); the edge corner nodes and edge mid-nodes are both rigid nodes; the formwork basic units (11) are multi-layer structures, the edge corner nodes and edge mid-nodes of each layer are fixed by means of horizontal rods (3), and the edge corner nodes and edge mid-nodes between the upper and lower layers are fixed by means of vertical rods (9); gourd holes are arranged on the sides of the edge corner nodes and edge mid-nodes, and the dumbbell pins pass through the gourd holes of adjacent formwork basic units (11), thereby combining all the formwork basic units (11) into one.

2. The modular bracket according to claim 1, wherein: The edge corner node comprises a first short tube (101), two second short tubes (102) vertically fixed on the first short tube (101), and a first side angle plate (104) fixed between the first short tube (101) and the second short tube (102); the two second short tubes (102) are vertically arranged; the gourd hole comprises a first gourd hole (105) opened on the first side angle plate (104); The edge mid-node comprises a fifth short tube (201), three sixth short tubes (202) vertically fixed on the fifth short tube (201), and a second side angle plate (204) fixed between the sixth short tube (202) and the fifth short tube (201); the three sixth short tubes (202) are arranged in a T-shape; and the gourd hole comprises a second gourd hole (205) opened on two outer second side angle plates (204).

3. The modular bracket according to claim 2, characterized in that: The ends of the first short tube (101), the second short tube (102), the fifth short tube (201), and the sixth short tube (202) away from the intersection point are respectively provided with a plurality of pin holes, and both ends of the vertical rod (9) and the horizontal rod (3) are provided with positioning holes corresponding to the pin holes, and the vertical rod (9) and the horizontal rod (3) are fixed to the edge corner node and the edge mid-node by socket fastening and then fixed by a transverse pin fastener.

4. The modular bracket according to claim 2, wherein: The top of the first short tube (101) located at the edge corner node of the non-top layer is higher than the second short tube (102), and the top of the fifth short tube (201) located at the edge mid-node of the non-top layer is higher than the sixth short tube (202); the tops of the first short tube (101) and the fifth short tube (201) are respectively provided with a plurality of pin holes.

5. The modular bracket according to claim 1, wherein: The modular support further comprises a plurality of adjustable brackets mounted on the top of the formwork frame (10), and a plurality of universal wheels (8) are provided at the bottom of the formwork frame (10).

6. A construction method for a prefabricated base plate using the modular support according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: assembling a formwork frame (10) on the ground; a plurality of adjustable brackets are provided on the top of the formwork frame (10); Step 2: Install the prefabricated base plate (13) stably on the adjustable bracket, and set the sling (14) and the anti-fall steel cable (15); Step 3: hoist the prefabricated base plate (13) and the formwork frame (10) as a whole and place them on the working surface; Step 4: Move the formwork support (10) on the working surface, adjust the adjustable support base, finely adjust the precast floor slab (13) to the precise position, and use a wedge to tightly hold and fix the bottom of the formwork support (10) to fix the position of the formwork support (10). Step 5: After completing the formwork task, lower the height of the adjustable support base, move the formwork support (10) to a convenient space beside, and remove it.

7. The construction method of the prefabricated base plate according to claim 6, characterized in that: In the second step, a square wood lath is provided between the adjustable support base and the precast floor slab (13), and the surface of the square wood lath is wrapped with a rubber cushion layer.

8. The construction method of the prefabricated base plate according to claim 6, characterized in that: In step 1, the steps of assembling the formwork support (10) on the ground are as follows: First, assemble the basic formwork unit (11), and then place the basic formwork units (11) horizontally and connect the calabash holes of adjacent basic formwork units (11) with dumbbell pins; one formwork support (10) is composed of 2 - 4 basic formwork units (11), and the basic formwork unit (11) is a three - layer structure.

9. The construction method of the prefabricated base plate according to claim 8, characterized in that: The assembly of the basic formwork unit (11) includes the following steps: S1: Design the size of each layer of the basic formwork unit (11) after assembly according to the size of the precast floor slab (13); the shape of each layer of the basic formwork unit (11) is "day" - shaped. S2: Assemble the upper support and the bottom support; the upper support includes 4 edge corner nodes, 2 edge middle nodes, one layer of horizontal bars (3) and one layer of vertical bars (9), and the bottom support includes 8 edge corner nodes, 4 edge middle nodes, two layers of horizontal bars (3) and one layer of vertical bars (9). S3: Insert and fix the bottom ends of the vertical bars (9) of the upper support into the edge corner nodes and edge middle nodes of the bottom support.

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