Reusable floor slab opening formwork

Abstract

This application relates to the field of formwork technology for floor slab openings, and in particular to a reusable floor slab opening formwork. The reusable formwork includes a precast template and multiple end caps. The precast template is shaped to fit the opening, and its end face has multiple notches. The end caps are detachably installed into the notches to seal them. The end caps and / or the precast template have through-slots for reinforcing bars to pass through. After the end caps are inserted into the notches, they clamp the reinforcing bars. The notches on the end face of the precast template, together with the end caps, form an openable through-slot structure. After the end caps are inserted into the notches, the end caps and the precast template can precisely clamp the reinforcing bars. This avoids the problem of concrete slurry seeping into and clogging traditional vertical through-slots due to difficulty in controlling the gaps, reducing the labor and time costs of repeated chiseling and cleaning later. Furthermore, the tight fit between the end caps and the notches ensures the accuracy of the reinforcing bar position, preventing reinforcing bar displacement during pouring from affecting the structural stability of the floor slab.

Description

Technical Field

[0001] This application relates to the field of formwork technology for floor slab openings, and in particular to a reusable formwork for floor slab openings. Background Technology

[0002] In the construction of reinforced concrete frame core tube structures for super high-rise buildings, openings through floor slabs are a common structural design to meet the needs of pipes, cables, and other equipment. To ensure construction safety during concrete pouring, avoid the risk of falls from heights, and ensure the quality of opening formation, reusable floor slab opening formwork has become an indispensable key component in this construction scenario. It not only needs to be adapted to the shape of the opening to achieve precise forming, but also needs to be reusable to meet the requirements of efficient construction and cost control. Especially in construction environments that require rapid demolding and the formation of standard openings, the structural rationality and ease of operation of the formwork are presented with greater challenges.

[0003] In the prior art, a reusable precast formwork for reserving reinforcement at floor slab openings includes a square pyramidal precast formwork. The precast formwork includes four aluminum formworks, which are connected sequentially on their sides to form a frame structure. Each aluminum formwork has a vertical through-groove for rebar, which extends upward from the lower edge of the aluminum formwork. The precast formwork is placed at the opening position, and the through-groove allows the rebar to pass through, effectively reserving the rebar at the opening position. After the rebar mesh passes through the through-groove, it forms a protective structure, realizing the temporary sealing and shaping of the opening area. After the pouring is completed, the formwork can be removed and reused.

[0004] However, in practical applications, the aluminum formwork with pre-reserved rebar slots is prone to blockage during concrete pouring due to the high fluidity of the grout. Furthermore, since the rebar slots vertically penetrate the aluminum formwork, cleaning requires repeatedly chiseling away the solidified concrete from both sides of the formwork. This not only consumes a lot of manpower and time but may also cause wear and deformation of the rebar slot edges due to improper operation, affecting the accuracy of subsequent rebar installation. Utility Model Content

[0005] To address the problem that existing reusable floor slab opening formwork with pre-reserved rebar grooves is prone to clogging by grout during concrete pouring, which is time-consuming, labor-intensive, and can easily damage the grooves, affecting the accuracy of subsequent construction, this application provides a reusable floor slab opening formwork.

[0006] The reusable floor slab opening formwork provided in this application adopts the following technical solution:

[0007] A reusable formwork for floor slab openings, comprising:

[0008] The prefabricated template is shaped to fit the opening, and the end face of the prefabricated template has multiple notches;

[0009] Multiple plugs are provided, which can be detachably installed in the notch to seal the notch. The plugs and / or the precast template are provided with through grooves for the reinforcing bars to pass through. The plugs are inserted into the notch and clamp the reinforcing bars.

[0010] Optionally, the extension directions of the plurality of said notches include transverse and longitudinal directions to adapt to the steel mesh formed by bidirectional reinforcement.

[0011] Optionally, the prefabricated template is a square template, which is spliced ​​together from four side templates, and the notch is located on the top surface of the side template.

[0012] Optionally, the notch extends in the width direction of the side template.

[0013] Optionally, the plug or the precast template is provided with the reinforcing bar groove, the reinforcing bar groove is a rectangular groove, and the width of the reinforcing bar groove is the same as the diameter of the reinforcing bar.

[0014] Optionally, both the plug and the precast template are provided with a reinforcing bar groove, which is a semi-circular groove. The reinforcing bar grooves of the plug and the precast template are spliced ​​together to form a circle with the same diameter as the reinforcing bar.

[0015] Optionally, the plug is provided with a lifting handle.

[0016] Optionally, the plug is engaged within the notch.

[0017] Optionally, the side of the plug that abuts against the precast template is provided with an elastic layer.

[0018] Optionally, the prefabricated template is an aluminum template.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. The horizontal and vertical extension directions of multiple notches on the end face of the precast template can be precisely matched with the two-way steel mesh. Combined with the plugs and / or the through-reinforcement grooves on the precast template (whether rectangular grooves or circles formed by splicing semi-circular grooves), it not only realizes the smooth insertion and stable clamping of the steel bars, ensuring the positional accuracy of the steel bars during the concrete pouring process, but also minimizes the gaps by the tight fit between the groove and the steel bars, effectively preventing concrete slurry from seeping in, avoiding the problem of blockage of the through-reinforcement grooves, and greatly reducing the subsequent cleaning work.

[0021] 2. The plug is equipped with a lifting handle, which snaps into the notch, simplifying the plug assembly and disassembly process. The operation can be completed without additional tools, significantly improving construction efficiency. The elastic layer on the side where the plug meets the precast template further enhances the sealing and firmness of the connection between the two, preventing grout leakage and buffering external impacts to reduce component wear. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of the reusable floor slab opening template in Embodiment 1 of this application;

[0023] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle;

[0024] Figure 3 This is a partial structural diagram of the plug located within the notch in Embodiment 2 of this application;

[0025] Figure 4 This is a partial structural diagram of the plug located within the notch in Embodiment 3 of this application;

[0026] Figure 5 This is a schematic diagram of the plug structure in Embodiment 4 of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Reinforcing steel bars; 1. Precast formwork; 11. Notch; 2. End cap; 21. Frame; 22. Elastic block; 23. Extrusion plate; 3. Through-reinforcement groove; 4. Lifting handle. Detailed Implementation

[0029] The following will be combined with the appendix Figure 1-5 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] This application discloses a reusable floor slab opening formwork. (Refer to...) Figure 1 The reusable floor slab opening formwork includes prefabricated formwork 1 and multiple plugs 2. The two work together to achieve efficient construction of floor slab openings and reusable formwork.

[0031] The precast formwork 1, serving as the main structure of the formwork, is shaped to fit the opening to be constructed. Erected on a support frame, it precisely conforms to the opening's contour, providing a basic framework for its formation. Made of aluminum, the precast formwork 1 is lighter, facilitating transport, installation, and dismantling between floors, effectively reducing labor intensity and improving construction efficiency. This is particularly advantageous in high-rise building construction, significantly reducing the load and cost of vertical transportation. Multiple notches 11 are provided on the end face of the precast formwork 1, providing channels for the insertion of reinforcing bars 100 and also accommodating the installation of end caps 2.

[0032] Multiple plugs 2 are detachably installed in the notches 11 of the precast template 1. Once the plugs 2 are in place, they can effectively seal the notches 11. In order to facilitate the smooth insertion and fixation of the reinforcing bars 100, the plugs 2 and / or the precast template 1 are provided with reinforcing bar grooves 3, the size of which is adapted to the reinforcing bars 100.

[0033] When the plug 2 is inserted into the notch 11, the through-reinforcement groove 3 will correspond to the reinforcing bar 100. Through the cooperation of the plug 2 and the precast formwork 1, a stable clamping effect can be formed on the through-reinforcement bar 100, ensuring the accurate positioning of the reinforcing bar 100 during construction. Furthermore, the plug 2 effectively prevents the seepage of concrete grout by sealing the notch 11, avoiding the problem of easy clogging of the through-reinforcement groove 3 in traditional formwork. The formwork is more convenient to install and dismantle, and its turnover rate is also improved, meeting the needs of efficient construction of super high-rise buildings.

[0034] In an optional embodiment, the end of the precast template 1 may be provided with a notch 11 extending laterally or longitudinally to match the unidirectional reinforcing bars 100. In this embodiment, the multiple notches 11 provided on the end face of the precast template 1 extend in both the transverse and longitudinal directions, which can better match the reinforcing mesh formed by bidirectional reinforcing bars 100 commonly used in building construction. Each reinforcing bar 100 in the bidirectional reinforcing mesh can pass smoothly through the corresponding notch 11. With the installation of the plug 2, it can not only achieve stable clamping of all reinforcing bars 100, ensuring that the position of the reinforcing bars 100 does not shift during concrete pouring, but also effectively prevent concrete slurry from seeping in by sealing the notch 11 through the plug 2, avoiding blockage problems.

[0035] In this embodiment, the prefabricated template 1 adopts a square structure, which is compatible with the structural requirements of square openings through floor slabs in most buildings. It can accurately fit the outline of the opening and provide a regular frame support for the opening formation. The square prefabricated template 1 can be composed of four side templates spliced ​​together, which facilitates the production and manufacturing of the template, reduces the processing difficulty of large integral templates, and also reduces space occupation during transportation and storage, improving turnover convenience. The four side templates can be stably spliced ​​together through suitable connection structures (such as buckles, bolts, etc.), ensuring that the square frame 21 formed after splicing has sufficient structural strength to withstand the lateral pressure generated during concrete pouring, and avoiding the impact of deformation under stress on the opening formation accuracy.

[0036] Notch 11 is located on the top surface of the side formwork, extending in the width direction of the side formwork. This facilitates the insertion and positioning of the reinforcing bars 100 during construction. When the four side formwork panels are spliced ​​together to form a square precast formwork 1, the notches 11 on the top surfaces of each side formwork cooperate to form a complete channel system around the square opening, enabling precise connection with the reinforcing mesh in the floor slab. Construction workers can directly install and fix the end caps 2 on the floor slab working surface and perform subsequent removal work without having to go deep into the formwork, further improving the convenience and efficiency of construction. At the same time, the location of notch 11 on the top surface of the side formwork also facilitates the inspection and maintenance of notch 11 and the surrounding structure during formwork turnover, ensuring its long-term stability.

[0037] Reference Figure 2 The plug 2 is detachably installed inside the notch 11 to seal it. In this embodiment, the plug 2 is installed inside the notch 11 of the precast template 1 by a snap-fit ​​method. For example, a concave-convex fit structure is used between the outer wall of the plug 2 and the inner wall of the notch 11. Protrusions are provided on both sides of the plug 2, and grooves matching the protrusions are provided at corresponding positions in the notch 11, or vice versa, the snap-fit ​​is achieved by the fitting of the protrusions and the grooves. Alternatively, the side of the plug 2 that abuts against the precast template 1 is provided with an elastic layer. This elastic layer is usually made of materials with good elasticity and sealing properties such as rubber and silicone. Its thickness is set according to the fit gap between the plug 2 and the notch 11 and the required elastic deformation range. It is firmly attached to the mating surface of the plug 2 by processes such as bonding and vulcanization, forming an integral structure with the plug 2.

[0038] When the plug 2 is engaged within the notch 11, the elastic layer will come into close contact with the inner wall of the notch 11 of the precast template 1 and undergo a certain degree of elastic deformation. This fills the tiny gaps between the plug 2 and the notch 11 caused by processing errors or assembly gaps, forming a reliable sealing structure. This further prevents concrete slurry from seeping into the reinforcement groove 3 from the gaps, enhancing the leak-proof effect of the template and avoiding the sealing problems caused by traditional rigid contact. At the same time, the elastic properties of the elastic layer can absorb the impact force generated by vibration during concrete pouring, reducing the rigid collision between the plug 2 and the precast template 1, playing a buffering and protective role, reducing the risk of wear and deformation due to long-term stress, and extending the service life of the template.

[0039] Furthermore, the elastic layer generates a reverse elastic force when deformed under pressure. This elastic force makes the snap-fit ​​structure between the plug 2 and the notch 11 tighter, enhancing the snap-fit's firmness and preventing the plug 2 from loosening due to external forces during construction. Moreover, the presence of the elastic layer reduces the stringent dimensional accuracy requirements when assembling the plug 2 and the notch 11. Even with minor dimensional deviations, a good fit can be achieved through the deformation of the elastic layer, improving the error tolerance of the template assembly and the ease of construction.

[0040] The plug 2 is equipped with a lifting handle 4, which facilitates quick installation and removal of the plug 2 within the notch 11. The lifting handle 4 can be manufactured as an integral part of the plug 2, or it can be fixed to the plug 2 by welding, screwing, or other methods. Its material is compatible with the plug 2 and has sufficient strength and durability to withstand the pulling force generated during the installation and removal of the plug 2.

[0041] The plug 2 and / or the precast template 1 are provided with a through-slot 3 for the reinforcing bar 100 to pass through. The plug 2 is inserted into the notch 11 and clamps the reinforcing bar 100. In this embodiment, the through-slot 3 is provided on the plug 2 and adopts a rectangular groove structure. The width of the rectangular through-slot 3 is the same as the diameter of the reinforcing bar 100 to be passed through, which makes the structure of the precast template 1 simpler, reduces the complexity of processing the groove on the precast template 1, and reduces the overall manufacturing difficulty of the template. By providing the through-slot 3 only on the plug 2, the template can adapt to the needs of reinforcing bars 100 of different sizes. By changing the plug 2 of different specifications, it can be flexibly adapted to various construction scenarios, enhancing the versatility and applicability of the template.

[0042] The notch 11 on the end face of the precast template 1, together with the plug 2, forms an openable rebar-through structure. After the plug 2 is inserted into the notch 11, the plug 2 and the precast template 1 can accurately clamp the rebar 100. This avoids the problem of concrete slurry seeping into and blocking the traditional vertical rebar-through groove 3 due to the difficulty in controlling the gap, and reduces the labor and time costs of repeated chiseling and cleaning in the later stage. It also ensures the accuracy of the position of the rebar 100 through the close cooperation between the plug 2 and the notch 11, and prevents the rebar 100 from shifting during the pouring process and affecting the stress stability of the floor slab structure.

[0043] The detachable design of the plug 2 allows for easy demolding after the concrete has solidified; simply remove the plug 2 without requiring complex processing of the precast formwork 1. Furthermore, the plug 2 can be reused after simple cleaning and inspection, significantly improving formwork turnover and reducing material consumption and construction costs. After installation, the plug 2 not only firmly secures the reinforcing steel 100, but the closed structure formed by the plug 2 and the precast formwork 1 also effectively prevents concrete from flowing out, serving both as a seal for openings and a protective function. This significantly reduces the risk of falls during pouring and improves construction safety.

[0044] Example 2

[0045] Reference Figure 3 The difference between this embodiment and Embodiment 1 is that both the bottom wall of the notch 11 and the bottom surface of the plug 2 are provided with reinforcing bar grooves 3, and both of these grooves 3 are semi-circular. When the plug 2 is inserted into the notch 11, the semi-circular reinforcing bar groove 3 on the bottom wall of the notch 11 and the semi-circular reinforcing bar groove 3 on the bottom surface of the plug 2 can be precisely spliced ​​to form a complete circular hole. The diameter of this circular hole is the same as the diameter of the reinforcing bar 100, which can achieve a perfect fit with the reinforcing bar 100.

[0046] During the rebar 100 insertion stage, the construction workers place the rebar 100 in the semi-circular insertion groove 3 on the bottom wall of the notch 11. Because the groove shape matches the outer circle of the rebar 100, it effectively provides initial positioning for the rebar 100, restricting its horizontal movement and ensuring it is in the predetermined insertion position. This initial positioning lays a good foundation for the subsequent installation of the plug 2. When installing the plug 2, the construction workers simply align the plug 2 with the notch 11 and insert it downwards. As the plug 2 descends, the rebar 100 on the bottom wall of the notch 11 will naturally guide the semi-circular insertion groove 3 on the bottom surface of the plug 2 to align with it—because the cylindrical surface of the rebar 100 can fit snugly against the arc surfaces of both semi-circular grooves. Under the influence of gravity and slight adjustments by the construction workers, the insertion groove 3 on the plug 2 will accurately align with the rebar 100.

[0047] When the plug 2 is fully inserted into the notch 11, the circular hole formed by the splicing of the two semi-circular reinforcing bar grooves 3 perfectly encloses the reinforcing bar 100. The inner wall of the circular hole is in close contact with the surface of the reinforcing bar 100, thus forming a firm clamping effect on the reinforcing bar 100. This not only effectively resists the influence of external forces such as vibration during concrete pouring, preventing the reinforcing bar 100 from shifting and ensuring the accuracy of the reinforcing bar 100's position, but also minimizes gaps by utilizing the tight fit between the circular hole and the reinforcing bar 100, preventing the seepage of concrete slurry and avoiding blockage of the reinforcing bar grooves 3. At the same time, the double-groove splicing structure retains the convenience of the bottom wall of the notch 11 for the initial positioning of the reinforcing bar 100, and achieves stable clamping of the reinforcing bar 100 through the cooperation of the plug 2 and the notch 11, taking into account both construction efficiency and structural stability, making the formwork more flexible and reliable in adapting to different construction scenarios. In addition, the semi-circular groove is simple to process, making it easy to accurately form on the precast formwork 1 and the plug 2, ensuring the consistency of the circular hole size after splicing, further improving the versatility and turnover rate of the formwork.

[0048] Example 3

[0049] Reference Figure 4The difference between this embodiment and Embodiment 1 is that the reinforcing bar groove 3 is set on the bottom wall of the notch 11 of the precast template 1, adopting a rectangular groove structure, and the width of the rectangular reinforcing bar groove 3 is the same as the diameter of the reinforcing bar 100 to be passed through. With the reinforcing bar groove 3 set on the bottom wall of the notch 11, once the reinforcing bar 100 is placed in the groove 3, its position is precisely fixed. When the construction personnel install the plug 2, they no longer need to spend time and effort adjusting the relative position of the plug 2 and the reinforcing bar 100 to achieve alignment; they only need to directly insert the plug 2 into the notch 11 to complete the installation, completely eliminating the operation of aligning the plug 2 with the reinforcing bar 100. This advantage is particularly evident in large-scale construction scenarios, effectively reducing the time consumption caused by alignment operations, reducing construction errors caused by inaccurate alignment, further improving construction efficiency and the stability of construction quality, and making the entire construction process smoother and more efficient.

[0050] Example 4

[0051] Reference Figure 5 The difference between this embodiment and embodiment 3 is that the plug 2 includes a frame 21 and an elastic block 22. The frame 21 serves as the supporting skeleton of the plug 2, and the lower part of the frame 21 adopts a four-sided hollow design, that is... Figure 5 The left, right, top and bottom surfaces are hollowed out, while the front and back sides are sealed. The hollow structure reduces the overall weight of the plug 2 and provides sufficient space for the expansion of the elastic block 22. The upper part of the frame 21 is a hollow structure with an opening on the bottom surface and an internal threaded hole on the top surface, which provides a connection base for the installation of the lifting handle 4.

[0052] The elastic block 22 is installed in the hollow area at the bottom of the frame 21 and fills the hollow areas on all four sides. It is in contact with the inner wall of the notch 11 of the precast template 1 and can be made of materials such as elastic rubber blocks. The lifting handle 4 is connected to the upper part of the frame 21 by a threaded engagement. The lifting handle 4 has an external thread that matches the internal thread hole of the upper part of the frame 21. The lower end of the lifting handle 4 is rotatably connected to the extrusion plate 23. By rotating the lifting handle 4, the extrusion plate 23 can be moved axially within the frame 21. The upper part of the frame 21 has a limiting chamber that is adapted to the up and down movement of the extrusion plate 23.

[0053] When it is necessary to fix the plug 2 into the notch 11, first insert the plug 2 into the notch 11 so that the elastic block 22 and the side wall of the notch 11 are initially in contact. Then, rotate the lifting handle 4. The lifting handle 4 moves downward under the action of the thread, gradually squeezing the elastic block 22 located inside the frame 21. After being subjected to axial pressure, the elastic block 22 will expand to the left, right and downward and tightly squeeze the side wall of the notch 11, thereby forming a firm seal and fixing effect, effectively preventing concrete grout from seeping in. At the same time, when the lifting handle 4 is rotated in the opposite direction, the pressure of the elastic block 22 is released and the elastic block 22 returns to its original shape, which facilitates the quick removal of the plug 2. This greatly improves the flexibility and reliability of the plug 2 in the process of reuse and further enhances the construction adaptability of the formwork system.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0055] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A recyclable floor opening formwork, characterized by, include: The prefabricated template (1) is shaped to fit the opening, and the end face of the prefabricated template (1) is provided with multiple notches (11); Multiple plugs (2) are provided, the plugs (2) are detachably installed in the notch (11) to seal the notch (11), the plugs (2) and / or the precast template (1) are provided with through grooves (3) for the reinforcing bars (100) to pass through, and the plugs (2) are inserted into the notch (11) to clamp the reinforcing bars (100).

2. The recyclable floor opening formwork of claim 1, wherein, The extension directions of the plurality of said notches (11) include transverse and longitudinal directions to adapt to the steel mesh formed by the bidirectional steel bars (100).

3. The turn-of-the-slab form of claim 1, wherein, The prefabricated template (1) is a square template, which is spliced ​​together from four side templates, and the notch (11) is located on the top surface of the side template.

4. The turn-of-the-slab form of claim 3, wherein, The extension direction of the notch (11) is the width direction of the side template.

5. The turn-of-the-slab form of claim 1, wherein, The plug (2) or the precast template (1) is provided with the reinforcing bar groove (3), the reinforcing bar groove (3) is a rectangular groove, and the width of the reinforcing bar groove (3) is the same as the diameter of the reinforcing bar (100).

6. The turn-of-the-century floor opening formwork of claim 1, wherein, Both the plug (2) and the precast template (1) are provided with a reinforcing bar groove (3). The reinforcing bar groove (3) is a semi-circular groove. The reinforcing bar groove (3) of the plug (2) and the precast template (1) are spliced ​​together to form a circle with the same diameter as the reinforcing bar (100).

7. The turn-of-the-century floor opening formwork of claim 1, wherein, The plug (2) is provided with a lifting handle (4).

8. The turn-of-the-century floor opening formwork of claim 1, wherein, The plug (2) is engaged within the notch (11).

9. The turn-of-the-slab form of claim 8, wherein, The side of the plug (2) that abuts against the precast template (1) is provided with an elastic layer.

10. The turn-of-the-slab form of claim 1, wherein, The prefabricated template (1) is an aluminum template.

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