Construction method of a modular support and prefabricated floor

Abstract

The application relates to the technical field of prefabricated floor construction, in particular to a modular support and a construction method of a prefabricated floor; the formwork support comprises a plurality of formwork basic units and dumbbell pins; the formwork basic unit is a multilayer structure; the dumbbell pin passes through the hupu hole of adjacent formwork basic units, and all the formwork basic units are combined into an integrated whole. The construction method is that the prefabricated floor is stably placed on the adjustable support seat of the formwork support, and the prefabricated floor is lifted from the ground to a working surface in a mode that the formwork support and the prefabricated floor are integrally lifted. In the lifting process, the prefabricated floor is hardly subjected to bending moment, so that the probability of cracks generated in the prefabricated floor is greatly reduced; after being lifted to the working surface, the position of the prefabricated floor can be finely adjusted conveniently and reliably through the modular formwork support, the prefabricated floor is accurately positioned, and the construction speed is accelerated.

Description

Technical Field

[0001] This application relates to the field of precast base plate construction technology, and in particular to a modular support and a construction method for precast base plates. Background Technology

[0002] Prefabricated composite slabs are floor structures composed of precast base slabs and cast-in-place concrete layers. The core construction technology utilizes the combination of "precast base slabs + cast-in-place composite layers" to achieve industrialized construction of the floor structure. Compared to traditional cast-in-place floors, it offers advantages such as higher construction efficiency, less on-site wet work, and better structural integrity. Precast base slabs are typically prefabricated in a factory to achieve a certain strength and rigidity, then transported to the construction site, hoisted onto the floor formwork, and after some detailed operations, a concrete layer is poured, forming a unified floor structure with the precast base slab.

[0003] The construction of prefabricated composite slab floors follows a logical sequence: "preliminary preparation → support erection → precast base slab installation → adjustment and joint treatment → composite layer concrete construction → curing and acceptance." The main process for erecting supports is as follows: measuring and marking out the positions of the uprights → placing base plates at the bottom of the uprights → erecting the uprights → ground bracing → longitudinal and transverse horizontal bracing → horizontal and vertical scissor bracing → wall ties → continuing to erect the next support structure → placing adjustable supports at the top of the uprights → placing load-bearing timber joists → checking the axis and elevation → waiting for the precast base slab to be hoisted for installation; traditional support materials generally use 48mm diameter steel pipes.

[0004] The key points for lifting and installing precast base slabs are as follows: ① Lifting method: Select appropriate lifting equipment and methods according to the size and weight of the composite slab. Generally, multi-point lifting is adopted to ensure that the slab is in a horizontal state during lifting, and to ensure that the slab is evenly stressed during the lifting process. The lifting speed should be uniform to avoid sudden starts and stops, and to avoid stress concentration that could cause the slab to crack. ② Lift slowly. When the slab is 500mm off the ground, check whether the stress on the lifting points is uniform and whether the slab is horizontal. If there is no tilt, continue lifting. ③ When the slab is lifted to about 300mm above the installation position, manually assist in horizontal movement to avoid collision with supports or already installed components. ④ Lower the slab slowly to ensure that the edge of the slab is aligned with the marked position. Adjust the position and angle of the slab in time to ensure that the splice joints between the slabs are uniform and consistent and meet the design requirements.

[0005] The key points for adjusting the construction after the precast base plate is installed are as follows: the plane position accuracy adjustment after the precast base plate is installed requires a second lifting, repeated horizontal movement, alignment and other operations; the flatness of the bottom of the plate is corrected by adjusting the height of the top support.

[0006] There are some shortcomings in the hoisting and installation technology of precast base slabs, mainly: ① The extra bending moment during the hoisting process of precast base slabs is difficult to control: Precast base slabs are generally large in size and about 70mm thick, which is relatively thin. Prestressed tendons are generally used in the span direction, while non-prestressed structural tendons are configured in the other direction. The bending resistance in the non-prestressed tendon direction is weak. Although the hoisting points can be evenly distributed, the stress is concentrated in the hoisting point area, and the precast base slab is subjected to bending in the non-prestressed tendon direction. During uneven hoisting, the bending moment will suddenly increase. Under the influence of various factors, the precast base slab is prone to damage and cracking. ② Low installation efficiency and high safety risks: First, when the precast base slab is hoisted to 300mm above the positioning point and suspended, the installation workers have to hold it by hand while communicating and directing the hoisting driver to operate the crane for fine-tuning of the position. This is a situation where the worker's reach is limited, reflecting low technical level, high safety risks, and low construction efficiency. Secondly, after the precast base plate is placed, it often needs to be lifted again to fine-tune its plane position. This fine-tuning alignment method is difficult to grasp and has low controllability. In addition, the precast base plate inevitably undergoes flat rubbing, and the horizontal force impacts the support frame, which poses a construction safety risk.

[0007] Currently, there are two main types of support frames used for prefabricated composite slab floor construction: The first type consists of a support system composed of steel pipes, fasteners, adjustable supports, and flat-laid square timber. Its characteristics include small spacing between uprights, the presence of longitudinal and transverse horizontal bars, good frame stability, and good contact and stability when the square timber serves as the support for the prefabricated base slab after installation. However, it suffers from drawbacks such as a wide variety of steel pipes and fasteners, poor resistance to horizontal forces, long assembly and disassembly times, and high labor costs. The second type is a support system consisting of independent adjustable steel supports and metal steel beams. Its characteristics include a larger design spacing between steel uprights, resulting in larger cross-sectional dimensions of the steel beams at the top of the uprights, requiring longer and heavier individual steel beams. However, the direct use of these steel beams as supports for the prefabricated base slab after installation leads to unsatisfactory contact and stability; poor resistance to horizontal forces; and inconvenient handling during assembly and disassembly. Furthermore, the direct use of steel beams as supports for the prefabricated base slab after installation also results in unsatisfactory contact and stability.

[0008] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0009] The purpose of this application is to provide a construction method for modular supports and prefabricated base plates to solve or alleviate the problems existing in the prior art.

[0010] To achieve the above objectives, this application provides the following technical solution:

[0011] A modular support frame includes a formwork support frame, which comprises several basic formwork support units and dumbbell pins. Each basic formwork support unit includes an edge corner node located at a corner position, an edge mid-node located at the center of the edge line, a horizontal bar, and a vertical bar. The edge corner nodes and edge mid-nodes are both rigid nodes. The basic formwork support unit has a multi-layer structure; the edge corner nodes and edge mid-nodes of each layer are fixed by horizontal bars, and the edge corner nodes and edge mid-nodes between upper and lower layers are fixed by vertical bars. The sides of the edge corner nodes and edge mid-nodes are provided with gourd-shaped holes, through which the dumbbell pins pass, assembling all the basic formwork support units into a single unit.

[0012] Furthermore, the edge corner node includes a first short pipe, two second short pipes vertically fixed on the first short pipe, and a first side corner plate fixed between the first short pipe and the second short pipes; the two second short pipes are arranged vertically; the gourd hole includes a first gourd hole opened on the first side corner plate;

[0013] The edge node includes a fifth short tube, three sixth short tubes vertically fixed to the fifth short tube, and a second side corner 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 corner plates.

[0014] Furthermore, the ends of the first short pipe, the second short pipe, the fifth short pipe, and the sixth short pipe away from the intersection point are each provided with a number of pin holes. The two ends of the upright and the horizontal bar are provided with positioning holes corresponding to the pin holes. The upright and the horizontal bar are fixed to the edge corner node and the edge center node by inserting and fixing them with horizontal pin fasteners.

[0015] 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 middle 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 several pin holes.

[0016] Furthermore, the modular support also includes several adjustable supports installed on the top of the formwork support frame, and several casters are provided at the bottom of the formwork support frame.

[0017] The present invention also proposes a construction method for a precast base plate using the aforementioned modular support, comprising the following steps:

[0018] Step 1: Assemble the formwork support frame on the ground; the top of the formwork support frame is equipped with several adjustable supports;

[0019] Step 2: Install the precast base plate stably on the adjustable support, and install slings and anti-fall steel cables;

[0020] Step 3: Lift the precast floor slab and the formwork support as a whole and hoist it to the working surface for landing.

[0021] Step 4: Move the formwork support on the working surface, adjust the adjustable support base, finely adjust the precast floor slab to the precise position, and use wedges to tightly support the bottom of the formwork support to fix the position of the formwork support.

[0022] Step 5: After completing the formwork task, lower the height of the adjustable support base, move the formwork support to a convenient space beside it, and remove it.

[0023] Further, in Step 2, a square wood lath is provided between the adjustable support base and the precast floor slab, and the surface of the square wood lath is wrapped with a rubber cushion layer.

[0024] Further, in Step 1, the steps of assembling the formwork support on the ground are as follows: First, assemble the basic formwork units, and then place the basic formwork units horizontally and connect the gourd holes of adjacent basic formwork units with dumbbell pins; one formwork support is composed of 2 - 4 basic formwork units, and the basic formwork unit is a three - layer structure.

[0025] Further, the assembly of the basic formwork unit includes the following steps:

[0026] S1: Design the size of each layer of the basic formwork unit after assembly according to the size of the precast floor slab; the shape of each layer of the basic formwork unit is "day" - shaped.

[0027] 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 and one layer of vertical bars, and the bottom support includes 8 edge corner nodes, 4 edge middle nodes, two layers of horizontal bars and one layer of vertical bars.

[0028] S3: Insert and fix the bottom ends of the vertical bars of the upper support into the edge corner nodes and edge middle nodes of the bottom support.

[0029] Compared with the closest prior art, the technical solution of the embodiment of the present application has the following beneficial effects:

[0030] The modular support of the present invention has a simple material composition and low material cost. The components are mainly fixed by socket - and - spigot connections, which is convenient for erection and disassembly, and is also convenient for adjusting the size and height of the modular support. Moreover, it can be hoisted as a whole, and the transportation is convenient, which can greatly save the construction cost.

[0031] All the joints of the modular support of the present invention are rigid joints. After the modular support is assembled, there is no need to additionally set horizontal and vertical cross braces; when disassembling, each basic formwork unit is disassembled by removing the dumbbell pins, and the overall height of the formwork support is reduced by removing the cross - pin fasteners of the socket - and - spigot vertical bars, so that the modular support can be separated and moved away conveniently and quickly.

[0032] The construction method of this invention first assembles the modular formwork frame on the ground, and then pre-installs the precast base plate on the formwork frame for overall hoisting. During the hoisting process, the precast base plate is almost not subjected to bending moment, which greatly reduces the probability of cracks in the precast base plate. After being hoisted to the working surface, the position of the precast base plate can be easily and reliably fine-tuned by adjusting the modular formwork frame, which facilitates the precise positioning of the precast top plate and speeds up the construction. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0034] Figure 1 This is a simplified structural diagram of the basic formwork unit according to an embodiment of the present invention.

[0035] Figure 2 This is a top view of the basic formwork unit according to an embodiment of the present invention.

[0036] Figure 3 This is a side view of the structure according to an embodiment of the present invention.

[0037] Figure 4 This is a simplified structural diagram of the formwork support frame according to an embodiment of the present invention.

[0038] Figure 5 This is a schematic diagram of the structure of the first corner node in an embodiment of the present invention.

[0039] Figure 6 This is a schematic diagram of the structure of the first node in an embodiment of the present invention.

[0040] Figure 7 This is a schematic diagram of the overall lifting of the precast base plate and formwork frame according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1-First corner node, 2-First middle node, 3-Horizontal bar, 4-Second corner node, 5-Second middle node, 6-Third corner node, 7-Third middle node, 8-Wheel caster, 9-Upright pole, 10-Formwork support frame, 11-Basic formwork unit, 13-Precast base plate, 14-Lifting cable, 15-Anti-fall steel cable, 101-First short pipe, 102-Second short pipe, 103-Third short pipe, 104-First side corner plate, 105-First hoist hole, 106-Fourth short pipe, 107-First top corner plate, 201-Fifth short pipe, 202-Sixth short pipe, 203-Seventh short pipe, 204-Second side corner plate, 205-Second hoist hole, 206-Eighth short pipe, 207-Second top corner plate. Detailed Implementation

[0043] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0044] In the following description, the terms "first / second / third" are used merely to distinguish similar objects and do not represent a specific order of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0045] 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 disclosure belongs. The terminology used herein is for the purpose of describing embodiments of this disclosure only and is not intended to limit this disclosure.

[0046] In the description of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and do not require this application to be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0047] like Figures 1 to 7 As shown, a modular support includes a formwork frame 10, which comprises several basic formwork units 11 and dumbbell pins. Each basic formwork unit 11 includes an edge corner node located at a corner, an edge center node located in the middle of the edge line, a horizontal bar 3, and a vertical bar 9. Both the edge corner nodes and the edge center nodes are rigid nodes. The basic formwork unit 11 has a multi-layer structure; the edge corner nodes and edge center nodes of each layer are fixed by the horizontal bar 3, and the edge corner nodes and edge center nodes between upper and lower layers are fixed by the vertical bar 9. The sides of the edge corner nodes and edge center nodes are provided with gourd-shaped holes, through which the dumbbell pins pass, combining all the basic formwork units 11 into a single unit.

[0048] The modular support frame of the present invention has rigid metal nodes at the edge center and edge corner. The horizontal bar 3 and the vertical bar 9 are inserted into the edge center and edge corner nodes and fixed by the horizontal metal pin to form a geometrically invariant three-dimensional frame unit. By setting pin holes and positioning holes and adjusting the length of the rods, the size of the basic support unit 11 can be designed as needed. The basic support unit 11 can be freely combined as needed to form the support frame 10.

[0049] like Figure 2 , Figure 3 , Figure 5 As shown, the edge corner node includes a first short pipe 101, two second short pipes 102 vertically fixed to the first short pipe 101, a first side corner plate 104 fixed between the first short pipe 101 and the second short pipes 102, a third short pipe 103 fixed on the inclined side of the first side corner plate 104, a first top corner plate 107 fixed between the two second short pipes 102, and a fourth short pipe 106 fixed on the inclined side of the first top corner plate 107. The two second short pipes 102 are arranged vertically. The two ends of the third short pipe 103 are respectively fixed to the first short pipe 101 and the second short pipe 102, and the two ends of the fourth short pipe 106 are respectively fixed to the two second short pipes 102. The gourd hole includes a first gourd hole 105 opened on the first side corner plate 104.

[0050] like Figure 2 , Figure 3 , Figure 6 As shown, the edge node includes a fifth short tube 201, three sixth short tubes 202 vertically fixed to the fifth short tube 201, a second side corner plate 204 fixed between the sixth short tube 202 and the fifth short tube 201, a seventh short tube 203 fixed on the hypotenuse of the second side corner plate 204, a second top corner plate 207 fixed between two adjacent sixth short tubes 202, and an eighth short tube 206 fixed on the hypotenuse of the second top corner plate 207. The three sixth short tubes 202 are arranged in a T-shape. The two ends of the seventh short tube 203 are respectively fixed to the fifth short tube 201 and the sixth short tube 202, and the two ends of the eighth short tube 206 are respectively fixed to two vertically adjacent sixth short tubes 202. The gourd-shaped hole includes a second gourd-shaped hole 205 opened on the two outer second side corner plates 204.

[0051] Furthermore, such as Figure 2 , Figure 3 , Figure 5 , Figure 6As shown, the ends of the first short pipe 101, the second short pipe 102, the fifth short pipe 201, and the sixth short pipe 202 away from the intersection point each have several pin holes. The ends of the upright 9 and the horizontal rod 3 are provided with positioning holes corresponding to the pin holes. The upright 9 and the horizontal rod 3 are fixed to the edge corner nodes and edge center nodes by insertion and then secured with horizontal pin fasteners. The pin holes are arranged in a triangular pattern. The horizontal rod 3 can be sleeved on the outside of the second short pipe 102 / sixth short pipe 202 or inserted into the second short pipe 102 / sixth short pipe 202. The length and width of the formwork basic unit 11 can be adjusted by adjusting the overlap length between the horizontal rod 3 and the second short pipe 102 / sixth short pipe 202. The layer height of the formwork basic unit 11 can be adjusted by adjusting the overlap length between the upright 9 and the fifth short pipe 201, thereby adjusting the height of the formwork basic unit 11. A cross pin fastener includes a cross pin and a fastener that is detachably fixed to the end of the cross pin. For example, the cross pin may be a long bolt, and the fastener may be a hand-tightening nut that matches the long bolt.

[0052] Furthermore, the top of the formwork support frame 10 is provided with several adjustable supports, and the bottom of the formwork support frame 10 is provided with several casters 8. The adjustable supports are existing technology, including a support screw, a support fixed to the top of the support screw, and an adjusting nut threaded onto the support screw. The number of adjustable supports is 4-8, roughly corresponding to the four corners and the midpoint of the edge of the precast base plate 13. The supports of the adjustable supports can be flat or U-shaped. Preferably, U-shaped supports are used, matched with square timber, the surface of which is covered with a 3-5mm rubber pad. The precast base plate 13 is directly supported on several adjustable supports, and the stress at each contact point is relatively concentrated. Using square timber pads between the adjustable supports and the precast base plate 13 can avoid damage to the surface of the precast base plate 13 that may be caused by stress concentration. During the production and transportation of the precast base slab 13, slight warping or surface unevenness may occur. The square timber itself has a certain rigidity and length (the length of the square timber matches the width of the base slab), and can span 2-3 adjustable supports. Through the deformation of the square timber itself and the rubber pad layer matching the slight unevenness of the base slab, "full contact and no gaps" between the base slab and the square timber is ensured, thereby evenly transferring the load to all adjustable supports and avoiding single-point overload. The rubber pad layer can buffer collisions and friction during hoisting or adjustment, preventing damage to the concrete precast base slab 13 caused by metal supports; at the same time, the rubber pad layer has greater friction, which can effectively prevent the base slab from sliding or shifting during hoisting or support.

[0053] Furthermore, such as Figures 1 to 7As shown, the basic support unit 11 is designed with three layers. The corner nodes located in the upper, middle, and lower layers are designated as the first corner node 1, the second corner node 4, and the third corner node 6, respectively. The middle nodes located in the upper, middle, and lower layers are designated as the first middle node 2, the second middle node 5, and the third middle node 7, respectively. Note that the gourd-shaped holes in each layer must maintain a shape that is larger at the top and smaller at the bottom. The second short pipe 102 of the first corner node 1 is welded and fixed to the top or upper part of the first short pipe 101, and the sixth short pipe 202 of the first middle node 2 is welded and fixed to the top or upper part of the fifth short pipe 201. In actual use, adjustable support screws are inserted into the first corner node 1 and the first middle node 2. The second short pipe 102 of the second corner node 4 is welded and fixed to the upper middle part of the first short pipe 101. The part of the first short pipe 101 that is higher than the second short pipe 102 is called the exposed section. The sixth short pipe 202 of the second middle node 5 is welded and fixed to the upper middle part of the fifth short pipe 201. The part of the fifth short pipe 201 that is higher than the sixth short pipe 202 is also called the exposed section. The exposed section is provided with several pin holes corresponding to the positions of the positioning holes. The exposed section is designed to facilitate the stable connection between the upper upright 9 and the edge corner node or edge middle node. Preferably, the diameter of the lower end of the upright 9 is larger than the first short pipe 101 / fifth short pipe 201. During assembly, the exposed section is inserted into the upright 9 and then connected and fixed by a horizontal pin fastener that passes through the pin hole and the positioning hole. The third corner node 6 and the third middle node 7 are set on the lower layer and require the installation of casters 8. The structure of the third corner node 6 is symmetrical to the second corner node 4, and the structure of the third middle node 7 is symmetrical to the structure of the second middle node 5.

[0054] The present invention also provides a construction method for a precast base plate using the aforementioned modular support, comprising the following steps:

[0055] Step 1: According to the dimensions of the precast base plate 13 and in accordance with relevant specifications and standards, design a formwork support frame 10 of reasonable dimensions, and assemble the formwork support frame 10 on the ground; the top of the formwork support frame 10 is provided with several adjustable supports;

[0056] Step 2: The precast base slab 13 is prefabricated in the factory and transported by truck to the project site. The project team uses a forklift / loader / crane to smoothly transport the precast base slab 13 onto the adjustable support of the formwork frame 10 assembled on the ground. Lifting slings 14 and anti-fall steel cables 15 are installed. After inspection, it awaits overall hoisting. The lower end of the lifting slings 14 is hooked to the corner nodes at the four corners. The anti-fall steel cables 15 are used to protect the precast base slab 13 from falling. The upper end of the anti-fall steel cables 15 is connected to the lifting slings 14, and the lower end of the anti-fall steel cables 15 is hooked to the precast base slab 13 or the formwork frame 10. Preferably, in order to avoid damage caused by direct hard contact between the adjustable support and the precast base slab 13, the adjustable support adopts a U-shaped support, and square timber wrapped with rubber pads is set on it to support the precast base slab 13. Three square timbers are set along the width direction of the precast floor slab.

[0057] Step 3: Lift the precast base plate 13 and the formwork support 10 as a whole, and place them on the working surface in accordance with the lifting procedures; Figure 7 Schematic diagram of the overall lifting of the precast base plate 13 and the formwork support 10;

[0058] Step 4: According to the design, move the formwork support 10 on the working surface, adjust the adjustable support, fine-tune the precast base plate 13 to the precise position, and use wedges (such as triangular wooden blocks, bricks, concrete blocks, stones, etc.) to tighten and fix the universal wheels 8 at the bottom of the formwork support 10 so that the position of the formwork support 10 is fixed.

[0059] Step 5: After completing the formwork support task, lower the height of the adjustable support or reduce the height of the formwork support frame 10, remove the wedges at the casters 8, move the formwork support frame 10 to a convenient space to the side, and remove it.

[0060] The traditional method involves hoisting the precast concrete base slab separately onto the formwork system of the floor for installation. To change this unsafe practice, this application designs the formwork frame 10 as a modular support. After assembling it on the ground, the precast base slab 13 is installed on the formwork frame 10 and then hoisted as a whole to the construction floor for moving and splicing. This reduces the risk of damage to the precast base slab 13 during hoisting and is safer and more convenient to transport.

[0061] The method for reducing the height of the formwork support 10 is as follows: In Step 1, reduce the overlapping length of the vertical poles 9 and the rigid joints, that is, adjust the floor height of the basic formwork unit 11 to the maximum. Then, in Step 5, remove the dumbbell pins and the transverse pin fasteners for inserting the vertical poles 9 from top to bottom according to the basic formwork unit 11. The second vertical pole 9 directly falls onto the rigid joint, reducing the floor height of the basic formwork unit 11 and the overall height of the formwork support 10. By using this method to reduce the height of the formwork support 10, the problem that it is difficult to adjust the height after the traditional formwork support 10 is erected at one time is avoided; through the strategy of "first high and then low", it not only ensures sufficient operating space during the construction process, but also realizes flexible and precise adjustment of the structural height, significantly improving the adaptability and construction efficiency of the formwork support 10, especially suitable for building scenarios with frequent floor height changes or limited clear height.

[0062] Further, in Step 1, the steps for 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 gourd holes of adjacent basic formwork units 11 with dumbbell pins; one formwork support 10 is composed of 2 - 4 basic formwork units 11. Preferably, one formwork support 10 is composed of 3 basic formwork units 11; the basic formwork unit 11 is a three-layer structure.

[0063] In this application, the basic formwork unit 11 is pre-assembled on the ground and then quickly connected by dumbbell pins to form an integral formwork support 10, realizing modular and factory pre-assembly, and improving construction safety and assembly efficiency. The design of combining 2 - 4 basic units (preferably 3) takes into account both structural stability and the convenience of transportation and hoisting; the three-layer structure design is convenient for adapting to the construction height of each working surface and also ensures the overall stiffness and bearing capacity.

[0064] Further, the assembly of the basic formwork unit 11 includes the following steps:

[0065] 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;

[0066] 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 poles 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 poles 9;

[0067] S3. Insert and fix the bottom ends of the vertical poles 9 of the upper support into the edge corner nodes and edge middle nodes of the bottom support; Figures 1-3 It is a schematic structural diagram of the assembled basic formwork unit 11;

[0068] This application achieves rapid assembly and disassembly of the basic formwork unit 11 through a modular combination of standardized edge corner nodes, edge mid-nodes, and members (horizontal bar 3, vertical bar 9), improving construction efficiency. The separate design of the upper and lower supports facilitates transportation and reuse; the socket-type connection method of the upper support inserting into the edge corner nodes and edge mid-nodes of the lower support makes installation simple and the connection reliable, effectively improving the overall structure and stability, while reducing reliance on high-precision welding or bolt connections, thus reducing manufacturing and maintenance costs.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A construction method for a precast base slab using modular supports, characterized in that, It includes the following steps: Step 1: The modular support includes a formwork support (10), and assemble the formwork support (10) on the ground; the formwork support (10) includes several formwork basic units (11) and dumbbell pins; the formwork basic unit (11) includes edge corner nodes arranged at the corner positions of the formwork basic unit (11), edge middle nodes arranged in the middle of the side line of the formwork basic unit (11), horizontal bars (3) and vertical bars (9); both the edge corner nodes and the edge middle nodes are rigid nodes; the formwork basic unit (11) is a multi-layer structure, and the edge corner nodes and edge middle nodes of each layer are fixedly connected by socketing with the horizontal bars (3), and the edge corner nodes and edge middle nodes between the upper and lower layers are respectively fixedly connected by socketing with the vertical bars (9); gourd holes are arranged 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 (11) to combine all the formwork basic units (11) into one body; several adjustable supports are arranged at the top of the formwork support (10); Step 2: Stably install the precast floor slab (13) on the adjustable supports, and arrange suspension ropes (14) and anti-falling steel cables (15); Step 3: Lift the precast floor slab (13) and the formwork support (10) as a whole and hoist it to the working surface for landing; Step 4: Move the formwork support (10) on the working surface, adjust the adjustable supports, finely adjust the precast floor slab (13) to the accurate position, and use wedges to tightly wedge 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 supports, move the formwork support (10) to the convenient space beside and remove it.

2. The construction method for the precast base slab according to claim 1, characterized in that: In Step 2, a square wood lath is padded between the adjustable support and the precast floor slab (13), and the surface of the square wood lath is wrapped with a rubber cushion layer.

3. The construction method for the precast base slab according to claim 1, characterized in that: In Step 1, the step of assembling the formwork support (10) on the ground is: first assemble the formwork basic unit (11), and then place the formwork basic units (11) horizontally and connect the gourd holes of adjacent formwork basic units (11) with dumbbell pins; one formwork support (10) is composed of 2 - 4 formwork basic units (11), and the formwork basic unit (11) is a three-layer structure.

4. The construction method of the precast base slab according to claim 1, characterized in that: The assembly of the formwork basic unit (11) includes the following steps: S1: Design the size of each layer of the formwork basic unit (11) after assembly according to the size of the precast floor slab (13); the shape of each layer of the formwork basic 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: Socket and fix the bottom ends of the vertical bars (9) of the upper support in the edge corner nodes and edge middle nodes of the bottom support.

5. The construction method for the precast base slab according to claim 1, characterized in that: The edge corner node includes a first short pipe (101), two second short pipes (102) vertically fixed on the first short pipe (101), and a first side corner plate (104) fixed between the first short pipe (101) and the second short pipes (102); the two second short pipes (102) are arranged vertically; the gourd hole includes a first gourd hole (105) opened on the first side corner plate (104). The edge node includes a fifth short tube (201), three sixth short tubes (202) vertically fixed on the fifth short tube (201), and a second side corner 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; the gourd hole includes a second gourd hole (205) opened on the two outer second side corner plates (204).

6. The construction method for the precast base slab according to claim 5, 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 have several pin holes. The two ends of the upright (9) and the horizontal rod (3) are provided with positioning holes corresponding to the pin holes. The upright (9) and the horizontal rod (3) are fixed by the edge corner node and the edge center node after being inserted and fixed by the horizontal pin fastener.

7. The construction method for the precast base slab according to claim 5, characterized in that: 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 middle node of the non-top layer is higher than the sixth short tube (202); the top of the first short tube (101) and the fifth short tube (201) are respectively provided with a number of pin holes.

8. The construction method for the precast base slab according to claim 1, characterized in that: The modular support also includes several adjustable supports installed on the top of the formwork support frame (10), and several casters (8) are provided at the bottom of the formwork support frame (10).

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