A kind of laminated slab cast-in-place slab formwork reinforcing node and construction method

Abstract

The application discloses a kind of cast-in-situ slab template reinforcing node of laminated slab and construction method, including two symmetrical laminated slab bodies, the through hole is prefabricated on the laminated slab body, the through hole is opened along the thickness direction of laminated slab body, and node reinforcing ware is movably inserted on the through hole;The application relates to the technical field of building construction, the beneficial effects of the application are that by prefabricating through hole on laminated slab and cooperating with the use of node reinforcing ware, construction personnel can adjust the perpendicularity of node reinforcing ware without damaging laminated slab and node reinforcing, and realize the sealing of through hole, avoid pouring leakage and joint cracking problem, while reducing the requirement for laminated slab prefabrication accuracy, simplifying production process, reducing the difficulty of deviation correction in construction process, ensuring the overall stress performance of laminated slab and cast-in-situ layer, and ensuring the construction quality of floor slab.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a composite slab cast-in-place slab reinforced with formwork and its construction method. Background Technology

[0002] Composite slab systems, as one of the main forms of floor slabs in prefabricated buildings, combine precast composite slabs with a cast-in-place upper concrete layer to jointly bear the load. This system combines the advantages of high-quality industrial production and fast construction speed of precast concrete components with the good integrity and adaptability to complex shapes of cast-in-place structures, and has become a widely used floor slab technology in modern buildings.

[0003] In the construction of precast composite slabs and cast-in-place strips, cast-in-place strips are usually set between adjacent precast composite slabs. The design of reinforcement and installation nodes for the cast-in-place strip formwork is a key technical aspect of the construction of composite slab systems, and the existing technologies involved include:

[0004] 1. CN109707090B A pre-embedded anti-misalignment structure under the reinforcing strip of a composite slab includes a cast-in-place concrete formwork. Precast composite slabs are respectively provided on both sides of the top width direction of the cast-in-place concrete formwork. Several pre-embedded bolts are provided on the precast composite slabs along their length direction. The pre-embedded bolts include hook bolts that pass through the precast composite slabs. One end of the hook bolt that passes through the precast composite slab is bent, and the other end penetrates the precast composite slab and approaches the cast-in-place concrete formwork. The pre-embedded bolts also include a fastening nut that is detachably connected to the end of the hook bolt that approaches the cast-in-place concrete formwork. A threaded rod is provided in the cast-in-place concrete formwork and is connected to the fastening nut through the cast-in-place concrete formwork.

[0005] 2. CN216042609U A composite slab post-cast strip structure based on aluminum formwork system assembly, comprising a composite layer structure, composite slabs, a template structure, and a support structure. The template structure is disposed on top of the spaced-apart support structure, and the composite layer structure and composite slabs are disposed on the template structure. The composite slabs are spaced-apart, and a post-cast strip structure is provided between adjacent composite slabs. The composite slabs are provided with tongue and groove, and the tongue and groove are located on both sides of the post-cast strip structure.

[0006] Including but not limited to the aforementioned existing technologies, internal threaded sleeves or screws are usually embedded in precast composite slabs. Therefore, it is necessary to accurately adjust the verticality of the embedded parts during the production stage of the composite slab. Once a deviation occurs during the embedding process, since the embedded parts are already solidified with the concrete, it is difficult to adjust the verticality of the embedded parts and the components installed on them on the construction site. Construction workers usually use non-standard methods such as forcefully hitting the embedded parts to correct the deviation, which not only affects the load-bearing performance of the connection nodes, but may also damage the precast composite slab or the embedded parts themselves. Furthermore, insufficient verticality of the embedded parts will directly lead to poor fixing effect of the formwork and the main and secondary keels, and may even lead to grout leakage and misalignment at the joint between the composite slab and the cast-in-place layer, affecting the overall quality of the floor slab. In view of this, this case was developed after in-depth research on the above problems. Summary of the Invention

[0007] The purpose of this invention is to solve the above-mentioned problems by designing a reinforced joint for precast composite slabs with formwork and a construction method. This addresses the issue that in existing technologies, internally threaded sleeves or bolts are typically embedded during the precast composite slab production process. Therefore, precise verticality adjustment of the embedded parts is required during the composite slab production stage. If deviation occurs during the embedding process, it is difficult to adjust the verticality of the embedded parts and the components installed on them on the construction site because the embedded parts are already bonded to the concrete. Construction workers often resort to non-standard methods such as forcefully striking the embedded parts to correct the deviation, which not only affects the load-bearing performance of the connection joint but may also damage the precast composite slab or the embedded parts themselves. Furthermore, insufficient verticality of the embedded parts directly leads to poor fixing of the formwork and main and secondary joists, and may even cause grout leakage and misalignment at the joint between the composite slab and the cast-in-place layer, affecting the overall quality of the floor slab.

[0008] The technical solution of the present invention to achieve the above objectives is as follows: a composite slab cast-in-place slab with formwork reinforcement node, comprising two symmetrically arranged composite slab bodies, each composite slab body having a pre-formed through hole, the through hole being opened along the thickness direction of the composite slab body, a node reinforcement device being movably inserted into the through hole, and the two composite slab bodies being interconnected with the formwork structure through the node reinforcement device.

[0009] The node reinforcement includes an insertion end that is movably inserted into a through hole. A sealing and pressing end is installed at the upper end of the insertion end and the end located above the composite plate body. The sealing and pressing end is movably attached to the upper wall surface of the composite plate body. A main rod leveling module is installed at the lower end of the insertion end and the end located below the composite plate body. A pulling mold end is movably installed below the main rod leveling module.

[0010] The main rod leveling module has a first position and a second position. In the first position, the main rod leveling module is separated from the lower wall of the composite plate body, and in the second position, the main rod leveling module is in a movable and fitted state with the lower wall of the composite plate body.

[0011] Preferably, the main rod leveling module includes a main screw, which is threadedly inserted into the lower part of the insertion end. An adjustment plate is movably mounted on the main screw via an extension. Multiple adjustment bolts are threadedly inserted into the adjustment plate in a circular array centered on the main screw. One end of each of the multiple adjustment bolts is movably mounted with a top arc contact.

[0012] Preferably, the top arc contact component includes a cap-shaped nut, and a flexible sleeve is fixedly fitted on the top of the cap-shaped nut. In the first position, the flexible sleeve is separated from the lower wall of the composite plate body, and in the second position, the flexible sleeve is in a movable and fitted state with the lower wall of the composite plate body.

[0013] Preferably, the sealing and pressing end includes a connecting post, which is threadedly inserted into the upper part of the insertion end. A disc cap is installed on the top of the connecting post, and a sealing gasket is movably fitted on the outer wall of the connecting post. The sealing gasket is movably attached to the lower wall of the disc cap and the upper wall of the composite plate body.

[0014] Preferably, the extension includes a central nut, which is threadedly fitted onto the main screw. A connecting sleeve is installed on the upper wall of the central nut, which is coaxial with the main screw. An adjusting plate is installed at one end of the connecting sleeve, and the adjusting plate is coaxial with the connecting sleeve. The connecting sleeve and the adjusting plate do not contact the main screw.

[0015] Preferably, the insertion end includes a sleeve, which is movably inserted into the through hole. The sleeve has an internal threaded hole at its center. The main screw and the connecting post are both matched with the internal threaded hole. The height of the connecting post is no more than one-third of the height of the sleeve.

[0016] Preferably, the die-drawing end includes a mountain-shaped component, which is movably fitted onto the main screw, and a bottom nut is movably fitted onto the main screw at the position below the mountain-shaped component via a nut.

[0017] Preferably, the formwork structure includes a template, which is movably attached to the lower wall of the two composite plate bodies. Multiple secondary keels are equidistantly attached to the lower wall of the template, and multiple main keels are movably attached to the lower wall of the multiple secondary keels. The main keels are matched with the mountain-shaped parts.

[0018] Preferably, the number of through holes is at least two, the center distance between two adjacent through holes is 800 mm, and the distance between the center of the through hole and the edge of the composite plate body is 150 mm.

[0019] A construction method includes the following steps:

[0020] Step 1: Hoist the composite slab body to the design elevation position, level it, and install it.

[0021] Step 2: Insert the sleeve with the sealing pressing end and the sealing gasket into the pre-made through hole from above the composite plate body, and the sealing gasket initially contacts the upper surface of the composite plate body.

[0022] Step 3: Screw the main screw into the sleeve. Insert the adjusting plate, which has been fitted with multiple capped nuts and flexible sleeves, into the main screw from the bottom through the extension. Rotate the middle nut to drive the adjusting plate to rise along the main screw until the flexible sleeve at the top of the adjusting bolt is in contact with the lower surface of the composite plate.

[0023] Step 4: Operate the adjusting bolts on the adjusting plate in the main rod leveling module. By changing the extension length of each adjusting bolt, the adjusting plate will produce the required slight tilt angle until the main rod reaches a vertical state.

[0024] Step 5: Install the formwork support structure and the pull-out end, and tighten the pull-out end. Fit the formwork tightly with the composite slab body, check the compaction of the top sealing gasket, and ensure that there is no gap between the sealing gasket and the composite slab body. Then pour concrete.

[0025] Step 6: After the cast-in-place concrete reaches the specified strength, remove the formwork structure, loosen and remove the pull-form end, rotate each adjusting bolt of the main rod leveling module downwards so that the cap nut and flexible sleeve are completely separated from the lower surface of the composite plate body, loosen and remove the main bolt.

[0026] Step 7: Use sealing material to fill and smooth the threaded hole left in the composite plate after the main screw is removed, as well as the slight concavity between the sleeve opening and the lower surface of the composite plate body.

[0027] The composite slab with formwork reinforcement joint and construction method made using the technical solution of this invention, by pre-drilling through holes in the composite slab and using joint reinforcement devices, allows construction workers to adjust the verticality of the joint reinforcement devices without damaging the composite slab and the joint reinforcement, and to achieve sealing at the through holes, avoiding problems such as grout leakage and joint cracking. At the same time, it reduces the requirements for the prefabrication accuracy of the composite slab, simplifies the production process, reduces the difficulty of correction during construction, ensures the overall stress performance of the composite slab and the cast-in-place layer, and ensures the construction quality of the floor slab. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the composite slab cast-in-place slab with formwork reinforcement nodes according to the present invention, viewed from a top angle.

[0029] Figure 2 This is a three-dimensional structural diagram of the composite slab cast-in-place slab with formwork reinforcement nodes as described in this invention, viewed from an upward angle.

[0030] Figure 3 This is a partial front view structural diagram of a composite slab cast-in-place slab with formwork reinforcement node according to the present invention.

[0031] Figure 4 This is a partial side view of the composite slab cast-in-place slab with formwork reinforcement node according to the present invention.

[0032] Figure 5 This is a three-dimensional exploded view of the node reinforcement device for a composite slab cast-in-place slab with template reinforcement nodes as described in this invention.

[0033] Figure 6 This is a three-dimensional exploded view of the node reinforcement device of the composite slab cast-in-place slab with template reinforcement node according to the present invention.

[0034] Figure 7 This is a three-dimensional structural diagram of a joint reinforcement device for a composite slab cast-in-place slab with template reinforcement nodes, as described in this invention, viewed from an exploded top view.

[0035] Figure 8 This is a three-dimensional structural diagram of a joint reinforcement device for a composite slab cast-in-place slab with template reinforcement nodes, as described in this invention, viewed from an exploded bottom angle.

[0036] Figure 9 This is a partial front sectional view of the composite slab cast-in-place slab with formwork reinforcement node according to the present invention.

[0037] Figure 10 This invention relates to a composite slab cast-in-place slab with formwork reinforcement node. Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0038] In the picture:

[0039] 1. Composite slab body; 2. Through hole; 3. Template; 4. Secondary keel; 5. Main keel; 6. Sleeve.

[0040] 7. Sealed pressing end; 71. Connecting post; 72. Disc cap; 73. Sealing gasket;

[0041] 8. Main rod leveling module; 81. Main screw; 82. Adjusting plate; 83. Adjusting bolt; 84. Cap nut; 85. Flexible sleeve; 86. Middle nut; 87. Connecting sleeve.

[0042] 9. Pulling mold end; 91. Mountain-shaped part; 92. Bottom nut. Detailed Implementation

[0043] Example 1:

[0044] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1-10 As shown, a composite slab cast-in-place slab with formwork reinforcement node.

[0045] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the art. The following mainly introduces the working principle and process.

[0046] A reinforced joint for a cast-in-place composite slab with formwork 3 includes two symmetrically arranged composite slab bodies 1. The composite slab bodies 1 are prefabricated with through holes 2, which are opened along the thickness direction of the composite slab bodies 1. A joint reinforcement device is movably inserted into the through hole 2. The two composite slab bodies 1 are connected to the formwork structure through the joint reinforcement device.

[0047] It should be noted that when producing the composite slab body 1, through holes 2 are prefabricated. Preferably, the number of through holes 2 is at least 2, the center distance between two adjacent through holes 2 is 800mm, and the distance between the center of the through hole 2 and the edge of the composite slab body 1 is 150mm. Then the composite slab body 1 is hoisted to the target position.

[0048] Specifically, the node reinforcement includes an insertion end that is movably inserted into the through hole 2. A sealing and pressing end 7 is installed at the upper end of the insertion end and located on the composite plate body 1. The sealing and pressing end 7 is movably attached to the upper wall surface of the composite plate body 1. A main rod leveling module 8 is installed at the lower end of the insertion end and located on the lower end of the composite plate body 1. A pulling mold end 9 is movably installed below the main rod leveling module 8.

[0049] It should be noted that when installing the casting template 3, the insertion end with the sealing and pressing end 7 installed is inserted into the through hole 2, and then the main rod leveling module 8 is installed and operated.

[0050] Specifically, the main rod leveling module 8 has a first position and a second position. The first position is that the main rod leveling module 8 is separated from the lower wall of the composite plate body 1, and the second position is that the main rod leveling module 8 is in a movable and attached state with the lower wall of the composite plate body 1.

[0051] It should be noted that when the main rod leveling module 8 is initially installed on the insertion end, it is in the first position. At this time, the sealing and pressing end 7 and the insertion end are in a free state within the composite plate body 1. Subsequently, the main rod leveling module 8 is moved to the second position, so that it fits against the lower wall of the composite plate body 1, and the sealing and pressing end 7 is sealed and pressed against the through hole 2 on the composite plate body 1 to prevent grout leakage during concrete pouring. Furthermore, the main rod leveling module 8 is moved so that it is perpendicular to the composite plate body 1, with a 2-3mm gap between the insertion end and the through hole 2. The gap is provided to allow space for the insertion end to adjust its position within the through hole 2 when the main rod leveling module 8 is adjusted to a vertical state. High precision is not required when manufacturing the composite slab body 1, which simplifies the manufacturing difficulty of the composite slab. Construction personnel do not need to use non-standard methods to correct the deviation of the main rod leveling module 8, ensuring the stress performance of the connection node, ensuring the quality of the precast composite slab and node reinforcement, ensuring the fixing quality of the template 3 and the main and secondary keels 4, ensuring the pouring quality at the joint between the composite slab and the cast-in-place layer, ensuring the overall quality of the floor slab, and avoiding quality problems such as leakage and cracking in the later stage.

[0052] Specifically, the main rod leveling module 8 includes a main screw 81, which is threadedly inserted into the lower part of the insertion end. An adjustment plate 82 is movably mounted on the main screw 81 through an extension. Multiple adjusting bolts 83 are threadedly inserted into the adjustment plate 82 in a circular array centered on the main screw 81. One end of each of the multiple adjusting bolts 83 is movably mounted with a top arc contact.

[0053] It should be noted that when installing the main rod leveling module 8, the main screw 81 is installed in the lower part of the insertion end by thread, and then the adjusting plate 82 with multiple adjusting bolts 83 installed is movably fitted onto the main screw 81 from below through the extension piece. Then, the adjusting plate 82 is rotated to move the adjusting plate 82 upward and close to the lower wall of the composite plate body 1 until the top arc contact piece contacts the lower wall of the composite plate body 1.

[0054] Specifically, the top arc contact component includes a cap-type nut 84, and a flexible sleeve 85 is fixedly fitted on the top of the cap-type nut 84. In the first position, the flexible sleeve 85 is separated from the lower wall of the composite plate body 1, and in the second position, the flexible sleeve 85 is in a movable and fitted state with the lower wall of the composite plate body 1.

[0055] It should be noted that construction workers can use tools such as plumb bobs to assist in checking the verticality of the main screw 81, or they can adjust it according to their construction experience. By turning each adjusting bolt 83, the adjusting plate 82 can produce a slight change in tilt, thereby causing the main screw 81 and its insertion end to deflect slightly until it reaches a vertical state. During this process, the arc design of the cap nut 84 facilitates the transmission of force and the fine adjustment of angle. The flexible sleeve 85 is used to separate the cap nut 84 from the composite plate body 1 to prevent the arc tip of the cap nut 84 from damaging the lower wall of the composite plate body 1.

[0056] Specifically, the sealing and pressing end 7 includes a connecting post 71, which is threadedly inserted into the upper part of the insertion end. A disc cap 72 is installed on the top of the connecting post 71, and a sealing gasket 73 is movably fitted on the outer wall of the connecting post 71. The sealing gasket 73 is movably attached to the lower wall of the disc cap 72 and the upper wall of the composite plate body 1.

[0057] It should be noted that the connecting post 71 and the disc cap 72 are an integral structure. The connecting post 71 is installed on the upper part of the insertion end by means of threads. The disc cap 72 is used to overlap the composite plate body 1. The sealing gasket 73 is used to seal around the through hole 2 on the composite plate body 1 to prevent grout leakage. Since the sealing gasket 73 has elastic deformation, the sealing gasket 73 still has a sealing function when the main screw 81 and the insertion end drive the connecting post 71 and the disc cap 72 to deflect slightly.

[0058] Specifically, the extension includes a central nut 86, which is threadedly fitted onto the main screw 81. A connecting sleeve 87 is installed on the upper wall of the central nut 86, which is coaxial with the main screw 81. An adjusting plate 82 is installed at one end of the connecting sleeve 87, and the adjusting plate 82 is coaxial with the connecting sleeve 87. The connecting sleeve 87 and the adjusting plate 82 do not contact the main screw 81.

[0059] It should be noted that by setting the connecting sleeve 87, the middle nut 86 is lower than the bottom of the adjusting bolt 83, which makes it easier for construction personnel to hold the middle nut 86 to make the extension drive the adjusting plate 82 to rotate, and prevents the hand from colliding with the adjusting bolt 83.

[0060] Specifically, the insertion end includes a sleeve 6, which is movably inserted into the through hole 2. The sleeve 6 has an internal threaded hole in its center. The main screw 81 and the connecting post 71 are both matched with the internal threaded hole. The height of the connecting post 71 is no more than one-third of the height of the sleeve 6.

[0061] It should be noted that the height of the sleeve 6 is not greater than the sum of the heights of the composite plate body 1 and the sealing gasket 73 in the compressed state, so as to avoid the bottom of the sleeve 6 protruding from the lower wall of the composite plate body 1 when the node reinforcement is installed and fixed, and to avoid cutting the sleeve 6 later. The height of the connecting column 71 is not greater than one-third of the height of the sleeve 6. The remaining two-thirds of the threads inside the sleeve 6 are engaged with the threads of the main screw 81 to ensure the engagement height of the main screw 81 and to prevent the main screw 81 from loosening.

[0062] Specifically, the pull mold end 9 includes a mountain-shaped part 91, which is movably fitted onto the main body screw 81, and a bottom nut 92 is movably fitted onto the main body screw 81 at the part below the mountain-shaped part 91 via a nut;

[0063] It should be noted that the mountain-shaped part 91 can move along the axial direction of the main screw 81, and the bottom nut 92 can limit the position of the mountain-shaped part 91 by threading with the main screw 81.

[0064] Specifically, the formwork structure includes a template 3, which is movably attached to the lower wall of the two composite plate bodies 1. Multiple secondary keels 4 are equidistantly attached to the lower wall of the template 3, and multiple main keels 5 are movably attached to the lower wall of the multiple secondary keels 4. The main keels 5 are matched with the mountain-shaped parts 91.

[0065] It should be noted that by cooperating with the pull mold end 9 and multiple main keels 5, the secondary keel 4 and the template 3 can be fixed. Since this is a well-known technology in the construction field, it will not be described in detail here. After the pouring is completed, the formwork structure and pull mold end 9 are removed in sequence. The adjusting bolt in the main rod leveling module 8 is rotated until the top arc contact part is separated from the lower wall of the composite plate. Then the main screw 81 is separated from the sleeve 6. Finally, the threaded hole in the sleeve 6 and the surface difference between the sleeve 6 and the lower wall of the composite plate are filled.

[0066] Example 2:

[0067] A construction method includes the following steps:

[0068] Step 1: Hoist the composite slab body 1 to the design elevation position and level, correct and install it;

[0069] Step 2: Insert the sleeve 6, which is equipped with the sealing pressing end 7 and the sealing gasket 73, downward from above the composite plate body 1 into the prefabricated through hole 2, and the sealing gasket 73 initially contacts the upper surface of the composite plate body 1.

[0070] Step 3: Screw the main screw 81 into the sleeve 6. Insert the adjusting plate 82 of the adjusting bolt 83, which has been fitted with multiple capped nuts 84 and flexible sleeves 85, into the lower end of the main screw 81 through the extension. Rotate the middle nut 86 to drive the adjusting plate 82 to rise along the main screw 81. When the flexible sleeve 85 at the top of the adjusting bolt 83 is close to the lower surface of the composite plate, the main rod leveling module 8 is in the first position. Continue to rotate the middle nut 86 to drive the adjusting plate 82 to rise along the main screw 81 until the flexible sleeve 85 at the top of the adjusting bolt 83 is in contact with the lower surface of the composite plate. At this time, the main rod leveling module 8 reaches the second position.

[0071] Step 4: Operate the adjusting bolts 83 on the adjusting plate 82 in the main rod leveling module 8. By changing the extension length of each adjusting bolt 83, the adjusting plate 82 will produce the required small tilt angle until the main screw 81 reaches a vertical state.

[0072] Step 5: Install the formwork support structure and the pull-form end 9, and tighten the pull-form end 9. Fit the template 3 tightly with the composite slab body 1. Check the compaction status of the top sealing gasket 73 to ensure that there is no gap between the sealing gasket 73 and the composite slab body 1. Then pour concrete.

[0073] Step 6: After the cast-in-place concrete reaches the specified strength, remove the formwork structure, loosen and remove the formwork end 9, rotate each adjusting bolt 83 of the main rod leveling module 8 downwards so that the cap nut 84 and flexible sleeve 85 are completely separated from the lower surface of the composite plate body 1, loosen and remove the main screw 81.

[0074] Step 7: Use sealing material to fill and smooth the threaded hole left in the composite plate after the main screw 81 is removed, as well as the small difference between the sleeve 6 opening and the lower surface of the composite plate body 1. The sealing material can be cement mortar.

[0075] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A composite slab cast-in-place slab with formwork reinforcement node, comprising two symmetrically arranged composite slab bodies (1), characterized in that, The composite plate body (1) is prefabricated with through holes (2), which are opened along the thickness direction of the composite plate body (1). A node reinforcement is movably inserted into the through hole (2), and the two composite plate bodies (1) are connected to the formwork structure through the node reinforcement. The node reinforcement includes an insertion end, which is movably inserted into the through hole (2). A sealing and pressing end (7) is installed on the upper end of the insertion end and the composite plate body (1). The sealing and pressing end (7) is movably attached to the upper wall surface of the composite plate body (1). A main rod leveling module (8) is installed on the lower end of the insertion end and the composite plate body (1). A pulling mold end (9) is movably installed below the main rod leveling module (8). The main rod leveling module (8) has a first position and a second position. In the first position, the main rod leveling module (8) and the lower wall of the composite plate body (1) are separated. In the second position, the main rod leveling module (8) and the lower wall of the composite plate body (1) are in a movable and attached state. The main rod leveling module (8) includes a main screw (81), which is threadedly inserted into the lower part of the insertion end. An adjustment plate (82) is movably mounted on the main screw (81) through an extension. Multiple adjustment bolts (83) are threadedly inserted into the adjustment plate (82) in a circular array with the main screw (81) as the center. One end of each adjustment bolt (83) is movably mounted with a top arc contact. The sealing and pressing end (7) includes a connecting post (71), which is threadedly inserted into the upper part of the insertion end. A disc cap (72) is installed on the top of the connecting post (71), and a sealing gasket (73) is movably fitted on the outer wall of the connecting post (71). The sealing gasket (73) is movably attached to the lower wall of the disc cap (72) and the upper wall of the composite plate body (1). The insertion end includes a sleeve (6), which is movably inserted into the through hole (2). The sleeve (6) has an internal threaded hole at its center. The main screw (81) and the connecting post (71) are both matched with the internal threaded hole. The height of the connecting post (71) is no greater than one-third of the height of the sleeve (6).

2. The composite slab cast-in-place slab with formwork reinforcement node according to claim 1, characterized in that, The top arc contact component includes a cap-type nut (84), and a flexible sleeve (85) is fixedly fitted on the top of the cap-type nut (84). In the first position, the flexible sleeve (85) is separated from the lower wall of the composite plate body (1), and in the second position, the flexible sleeve (85) is in a movable fit with the lower wall of the composite plate body (1).

3. The composite slab cast-in-place slab with formwork reinforcement node according to claim 1, characterized in that, The extension includes a central nut (86), which is threadedly fitted onto the main screw (81). A connecting sleeve (87) is installed on the upper wall of the central nut (86) coaxially with the main screw (81). An adjusting plate (82) is installed at one end of the connecting sleeve (87), and the adjusting plate (82) and the connecting sleeve (87) are coaxially arranged. The connecting sleeve (87) and the adjusting plate (82) do not contact the main screw (81).

4. A composite slab cast-in-place slab reinforced with formwork according to claim 1, characterized in that, The pull mold end (9) includes a mountain-shaped part (91), which is movably fitted on the main body screw (81), and a bottom nut (92) is movably fitted on the main body screw (81) and below the mountain-shaped part (91) by a nut.

5. A composite slab cast-in-place slab reinforced with formwork according to claim 1, characterized in that, The formwork structure includes a template (3), which is movably attached to the lower wall of the two composite plate bodies (1). Multiple secondary keels (4) are attached at equal intervals to the lower wall of the template (3), and multiple main keels (5) are movably attached to the lower wall of the multiple secondary keels (4). The main keels (5) are matched with the mountain-shaped parts (91).

6. A composite slab cast-in-place slab reinforced with formwork according to claim 1, characterized in that, The number of through holes (2) is at least 2, the center distance between two adjacent through holes (2) is 800mm, and the distance between the center of the through hole (2) and the edge of the composite plate body (1) is 150mm.

7. A construction method applied to the reinforced joint of a composite slab cast-in-place slab with formwork as described in any one of claims 1-6, characterized in that, The following steps are included: Step 1: Hoist the composite slab body (1) to the design elevation position and level, correct and install it; Step 2: Insert the sleeve (6) with the sealing pressing end (7) and the sealing gasket (73) downward from above the composite plate body (1) into the prefabricated through hole (2), and the sealing gasket (73) initially contacts the upper surface of the composite plate body (1); Step 3: Screw the main screw (81) under the sleeve (6), and put the adjusting plate (82) of the adjusting bolt (83) with multiple capped nuts (84) and flexible sleeves (85) installed into the lower end of the main screw (81) through the extension. Rotate the middle nut (86) to drive the adjusting plate (82) to rise along the main screw (81) until the flexible sleeve (85) at the top of the adjusting bolt (83) is in contact with the lower surface of the composite plate. Step 4: Operate the adjusting bolts (83) on the adjusting plate (82) in the main rod leveling module (8). By changing the extension length of each adjusting bolt (83), the adjusting plate (82) will produce the required small tilt angle until the main screw (81) reaches the vertical state. Step 5: Install the formwork support structure and the pull-form end (9), and tighten the pull-form end (9). Fit the template (3) tightly with the composite slab body (1). Check the compaction status of the top sealing gasket (73) to ensure that there is no gap between the sealing gasket (73) and the composite slab body (1). Then pour concrete. Step 6: After the cast-in-place concrete reaches the specified strength, remove the formwork structure, loosen and remove the pull form end (9), rotate each adjusting bolt (83) of the main rod leveling module (8) downwards, so that the cap nut (84) and flexible sleeve (85) are completely separated from the lower surface of the composite plate body (1), loosen and remove the main screw (81). Step 7: Use sealing material to fill and smooth the threaded hole left in the composite plate after the main screw (81) is removed, as well as the small difference between the sleeve (6) opening and the lower surface of the composite plate body (1).

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