Construction tool for preventing slurry leakage of laminated slab post-cast strip and suspended formwork structure

Abstract

The utility model relates to the technical field of building construction formwork erecting and reinforcing, in particular to a construction tool and a formwork hanging structure for preventing slurry leakage of a post-cast strip of a laminated slab. On one hand, conical nuts with threads at the two ends opposite in direction are adopted for connecting an opposite-pull inner rod and an opposite-pull outer rod, and under the condition that concrete is poured to form the post-cast strip, the opposite-pull inner rod and the opposite-pull outer rod are connected through the conical nuts; the tightening torque of the opposite-pull outer rod can be converted into pulling resistance to the conical nut, so that the conical nut is separated from post-cast strip concrete and is spirally taken out along the opposite-pull inner rod, and secondary reuse is facilitated; on the other hand, the cross beams are transversely arranged at the bottom of the post-cast strip formwork so that the cross beams can be directly supported on the formwork, the longitudinal connecting pieces are longitudinally arranged at the bottoms of the cross beams so that the multiple cross beams can be supported and connected together, and the longitudinal connecting pieces are supported and fixed through the locking pieces at the bottom ends of the multiple opposite-pull screw rods; the limitation that the mounting position of the opposite-pull screw is limited by the position of the cross beam can be relieved, and the working condition adaptability is improved.

Description

Technical Field

[0001] This utility model relates to the field of formwork support and reinforcement technology in building construction, and in particular to a construction tool and hanging formwork structure for preventing grout leakage in the post-pouring strip of composite slabs. Background Technology

[0002] In prefabricated construction, composite slabs, as a structural form combining prefabrication and cast-in-place construction, are widely used in high-rise buildings and large-span structures due to their advantages such as convenient construction, controllable quality, energy saving, and environmental protection. During the construction of composite slabs, long strips of post-pouring strips are reserved between the slabs to reduce harmful cracks that may be caused by uneven shrinkage or settlement. In traditional construction methods for post-pouring strips, a separate support frame is usually set up at the bottom of the post-pouring strip formwork for construction. However, during construction, it is impossible to ensure that the post-pouring strip formwork and the bottom of the composite slab are completely in contact, which easily leads to grout leakage.

[0003] Existing technologies address the problem of grout leakage due to misalignment between the post-cast strip formwork and the composite slab. For example, application number 202123118299.5 provides a detachable post-cast strip formwork lifting tool for composite slabs. This tool involves setting longitudinal beams on both sides of the bottom of the post-cast strip formwork near the composite slab, and then setting a transverse beam below the longitudinal beams. Tie rods pass through the transverse beams in the post-cast strip. One end of the tie rod is supported on the surface of the composite slab on both sides using a straight-line hanging rod structure, while the other end is fixed to the bottom of the transverse beam using a U-shaped clamp and nut. Tightening the nut transmits the preload through the transverse beam to the longitudinal beams on both sides. The longitudinal beams and hanging rods strengthen the clamping force between the post-cast strip formwork and the composite slab, thereby achieving a tight fit between the post-cast strip formwork and the composite slab and preventing grout leakage. However, this method has the following drawbacks:

[0004] 1. The tie rod includes an inner tie rod and an outer tie rod. A sleeve with internal threads is installed at the bottom of the inner tie rod, and the outer tie rod is connected by the threaded sleeve. Since the inner tie rod and the outer tie rod are directly connected by threads, the diameters of the inner tie rod and the outer tie rod are different. The wall thickness of the sleeve of the inner tie rod is relatively thin, and both the outer and inner surfaces of the sleeve need to be threaded, which makes the operation difficult, the connection strength is low, and affects the stress of the entire structure.

[0005] 2. Although the existing technical solution can prevent the poured concrete from entering the casing by threading a tapered nut on the outer wall of the casing and having the tapered nut abut against the template, thus facilitating the disassembly of the outer rod, the tapered nut cannot be removed after the outer rod is disassembled, resulting in material waste.

[0006] 3. Since the crossbeam is the main load-bearing material, an opening needs to be drilled in the middle of the crossbeam for the tie rods to pass through during construction. The spacing of the tie rods must match the crossbeam and cannot be adjusted automatically. In addition, the crossbeam is used to connect the longitudinal beams on both sides into a whole. The nut point acts on the crossbeam. When the tension torque of the tie rod is too large, it is very easy to cause the crossbeam to deform or even bend. A larger thickness is required, which increases the space occupation and economic investment.

[0007] Therefore, it is necessary to further optimize the formwork construction of the post-pouring strip of the composite slab in order to solve or improve at least one or more of the above-mentioned defects. Utility Model Content

[0008] The purpose of this invention is to provide a construction tool and formwork structure for preventing grout leakage in the post-pouring strip of composite slabs, to overcome or improve one or more of the above-mentioned disadvantages or problems, or at least to provide a useful commercial alternative.

[0009] In a first aspect, this utility model provides a construction tool for preventing grout leakage in the post-cast strip of a composite slab, comprising tie rods and locking components. The tie rods include a hanger rod, an inner tie rod, an outer tie rod, and a tapered nut. The two ends of the hanger rod are used to be horizontally mounted on the composite slab on both sides of the post-cast strip. The hanger rod is perpendicularly connected to the inner tie rod. The locking component is used to threadedly connect the outer tie rod. Both the inner tie rod and the outer tie rod are used to be threadedly connected to the tapered nut. The threads at both ends of the tapered nut are in opposite directions.

[0010] This solution uses tapered nuts with opposite thread directions at both ends to connect the inner and outer tie rods. When the concrete of the post-cast strip is poured and formed, the tightening torque of the outer tie rod can be converted into a pull-out force on the tapered nut, causing the tapered nut to separate from the concrete of the post-cast strip and be spirally removed along the inner tie rod. The outer tie rod and tapered nut can be reused, improving the utilization rate of parts, reducing material waste, and helping to reduce construction costs.

[0011] In this design, since the inner tie rod is connected to the outer tie rod via a tapered nut, there is no need to add an internal thread at the end of the inner tie rod to reduce the effective wall thickness of the inner tie rod connection. This results in higher structural strength and reduced processing difficulty.

[0012] Preferably, the tapered nut is a metal component that is corrosion-resistant, wear-resistant, has high structural strength, high machining precision, and is easy to fit tightly with the inner and outer tie rods, preventing mud from seeping into the threads.

[0013] Preferably, the hanger rod and the inner tie rod are integrally formed components, avoiding on-site processing, reducing on-site construction work, and improving construction efficiency.

[0014] As another possible implementation, the boom and the inner tie rod can also be of a separate structure, and the boom and the inner tie rod can be connected as a whole on site by means of threaded connection or welding.

[0015] In a second aspect, this utility model provides a formwork structure for a post-cast strip of a composite slab, comprising a plurality of composite slabs, with a post-cast strip provided between adjacent composite slabs, and a plurality of the aforementioned construction tools provided in the post-cast strip. A template is provided at the bottom of the post-cast strip, and both ends of the template extend laterally to the bottom sides of the composite slabs on both sides of the post-cast strip. The two ends of the lifting rods of the construction tools are respectively placed on the upper sides of the composite slabs on both sides of the post-cast strip. The outer tie rod of the construction tools passes through the template and is connected to a locking member, and a conical nut abuts against the inner side of the template.

[0016] The template can be a steel mold with hollow grids. The steel molds can be connected to each other on the side by bolts to form a whole, which is used to support the construction of the post-pouring strip and the composite slab, making construction convenient.

[0017] Preferably, the bottom of the template is provided with a crossbeam, the two ends of which extend laterally to the bottom side of the composite plate on both sides of the post-pouring strip, and the crossbeams are arranged at intervals along the post-pouring strip; the bottom of the crossbeam is provided with a longitudinal connector, the longitudinal connector longitudinally connects multiple crossbeams, and the longitudinal connector is connected to several locking members.

[0018] This solution uses longitudinal connectors to support multiple crossbeams, and several locking devices of construction tools collectively support the longitudinal connectors. The preload of the locking devices is transferred through the longitudinal connectors to the multiple crossbeams, and then to the formwork. This achieves the same effect of tightly fitting the formwork to the composite slab and preventing grout leakage. Furthermore, it eliminates the need to align the locking device positions with the crossbeam positions, allowing for more flexible placement of construction tools and better adaptability to different working conditions. It also eliminates the need for perforations in the crossbeams, reducing on-site workload and improving construction efficiency.

[0019] More preferably, the bottom of the crossbeam is provided with a longitudinal beam, which is respectively set to correspond to the positions of the composite slabs on both sides of the post-pouring strip. The bottom of the longitudinal beam is provided with a support frame, which is used to support the composite slabs. This solution, by setting a crossbeam at the bottom of the formwork and extending the formwork and crossbeam at the bottom of the post-pouring strip laterally to the positions of the composite slabs on both sides, and supporting the composite slabs under the composite slabs with longitudinal beams and ground supports, can further ensure the fit between the composite slabs and the formwork, and also ensure the flatness of the bottom surface of the concrete poured for the composite slabs and post-pouring strips. The structure is reasonably arranged, the space utilization rate is high, and the construction quality is good.

[0020] Preferably, the locking component includes a U-shaped clamp and a nut, and the longitudinal connecting component adopts a steel pipe that matches the U-shaped clamp. The steel pipe is symmetrically arranged on opposite sides of the U-shaped clamp, which makes the structure lightweight, easy to construct, and economical.

[0021] As another possible implementation, longitudinal beams and transverse beams can be sequentially installed at the bottom of the template.

[0022] In a third aspect, this utility model provides a suspended formwork structure for a post-cast strip of a composite slab, comprising a plurality of composite slabs, with a post-cast strip provided between adjacent composite slabs. The post-cast strip contains a plurality of tie rods, and a template is provided at the bottom of the post-cast strip. Both ends of the template extend laterally to the bottom sides of the composite slabs on both sides. One end of each tie rod is laterally supported on the upper side of the composite slabs on both sides of the post-cast strip via a suspension rod, and the other end of each tie rod passes sequentially through the post-cast strip and the template and is connected to a locking member. A crossbeam is provided at the bottom of the template, with both ends extending laterally to the bottom sides of the composite slabs on both sides of the post-cast strip. The crossbeams are spaced apart along the post-cast strip. A longitudinal connector is provided at the bottom of the crossbeam, and the longitudinal connector longitudinally supports multiple crossbeams and is supported by the locking member.

[0023] This solution involves setting horizontal beams at the bottom of the post-cast strip template, allowing the beams to directly support the template. Multiple beams are then connected together by longitudinal connectors at the bottom of the beams. These longitudinal connectors are then supported and fixed by locking devices at the bottom of multiple tie rods, thereby reinforcing the composite plate and module with the tie rods.

[0024] Compared to existing technologies that involve setting longitudinal beams followed by transverse beams at the bottom of the formwork, the tie rods in the above-mentioned suspended formwork structure can be flexibly arranged according to actual working conditions, offering good adaptability and eliminating the constraints of transverse beam positions. For example, tie rods can pass directly through the gaps between adjacent transverse beams, reducing on-site drilling work and increasing construction efficiency. Furthermore, with this suspended formwork structure, the transverse beams span the connection between the post-cast strip and the composite slab, with the top surface of the beams simultaneously supporting both the composite slab and the formwork. This large contact area, combined with the tensioning action of the tie rods, results in better stress distribution, stronger bending resistance, and a better fit between the beams.

[0025] Preferably, the bottom of the crossbeam is provided with a longitudinal beam, which is respectively located on both sides of the composite slab on both sides of the post-cast strip. The bottom of the longitudinal beam is provided with a support frame, which is used to support the composite slab. This solution integrates the support and reinforcement structure at the post-cast strip with the support and reinforcement structure at the composite slab. The formwork and crossbeam are supported at the bottom by tie rods and ground supports at multiple points, resulting in good structural strength, construction safety, reasonable spatial layout, and excellent construction quality.

[0026] As another possible implementation, tie rods and formwork support components can be set separately for the post-pouring strip position, and a separate support structure can be set at the composite slab position, not limited to the examples above.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1. This utility model provides a construction tool for preventing grout leakage in the post-cast strip of composite slabs. By using conical nuts with opposite thread directions at both ends to coaxially connect the inner and outer tie rods, when the post-cast strip is being poured and formed with concrete, the tightening torque of the outer tie rod can be converted into a pull-out force on the conical nut, causing the conical nut to detach from the post-cast strip concrete and be spirally removed along the inner tie rod. The outer tie rod and the conical nut can be reused, improving the utilization rate of parts, reducing material waste, and lowering economic costs.

[0029] 2. This utility model provides a suspended formwork structure for post-cast strip of composite slabs. By sequentially arranging horizontal beams and longitudinal connectors at the bottom of the post-cast strip formwork, multiple horizontal beams are connected together by the longitudinal connectors. Tie rods and locking devices are connected to the longitudinal connectors at multiple points to fix the formwork. It is not necessary to set the position of the locking devices to correspond to the position of the horizontal beams. The arrangement of the tie rods is more flexible and adaptable to working conditions. It is also not necessary to open perforations on the horizontal beams, which helps to reduce on-site workload and improve construction efficiency. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a construction tool used to prevent grout leakage from the post-pouring strip of a composite slab, as shown in Example 1.

[0031] Figure 2 This is a structural schematic diagram of another construction tool used in Example 1 to prevent grout leakage from the post-pouring strip of the composite slab;

[0032] Figure 3 for Figure 2 A three-dimensional image;

[0033] Figure 4 This is a schematic diagram of a suspended formwork structure constructed using construction tools.

[0034] Markings in the diagram: 1-Hanging rod; 2-Inner tie rod; 3-Outer tie rod; 4-Conical nut; 5-Longitudinal connector; 6-W-shaped clip; 7-Nut; 8-Formwork; 9-Horizontal beam; 10-Longitudinal beam; 11-Composite slab; 12-Cast-in-place layer; 13-Support frame. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0036] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0038] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0039] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0040] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0041] Example 1

[0042] like Figure 1 As shown, a construction tool for preventing grout leakage in the post-cast strip of composite slab 11 includes tie rods and locking components. The tie rods include a hanger rod 1, an inner tie rod 2, an outer tie rod 3, and a conical nut 4. The two ends of the hanger rod 1 are used to be horizontally mounted on the composite slab 11 on both sides of the post-cast strip. The hanger rod 1 is vertically connected to the inner tie rod 2. The locking component is used to threadedly connect the outer tie rod 3. Both the inner tie rod 2 and the outer tie rod 3 are used to threadedly connect to the conical nut 4. The thread directions at both ends of the conical nut 4 are opposite.

[0043] In this design, the inner tie rod 2 is connected to the outer tie rod 3 via a tapered nut 4. There is no direct connection between the inner tie rod 2 and the outer tie rod 3. Therefore, it is not necessary to set an internal thread at the end of the inner tie rod 2 to reduce the effective wall thickness of the inner tie rod 2 connection. Only an external thread needs to be set on the inner tie rod 2. This design results in high structural strength and simple processing.

[0044] In this scheme, it is preferable to set the diameters of the inner tie rod 2 and the outer tie rod 3 to be the same, which facilitates material selection and ensures the coaxiality of the two ends of the through hole of the tapered nut 4.

[0045] Furthermore, in this embodiment, the hanger 1 and the inner tie rod 2 are preferably integrally molded components, with an overall T-shape, to avoid on-site processing, reduce on-site construction work, and improve construction efficiency.

[0046] The tapered nut 4 is preferably made of metal, which is corrosion-resistant, wear-resistant, and has high structural strength. It is easy to pull out and reuse, which can significantly improve the turnover rate. Using a metal tapered nut 4 makes it easier to demold from the concrete of the post-cast strip on the formed surface, resulting in better appearance quality. Compared with plastic internal threads, it has higher processing precision and is easier to fit tightly with the inner tie rod 2 and the outer tie rod 3, preventing mud from seeping into the thread and improving construction efficiency.

[0047] In use, the tie rods are inserted into the post-pouring strip and the template 8, and are arranged at intervals along the post-pouring strip. One end of the tie rod is horizontally supported on the composite plate 11 on both sides of the post-pouring strip through the hanger 1, and the other end passes through the template 8 from the post-pouring strip and is connected to the locking device. The conical nut 4 is finely adjusted so that the large end of the conical nut 4 abuts against the inner side of the post-pouring strip template 8. The tie rod 3 or the locking device is rotated so that the locking device abuts against the other side of the template 8, so that the composite plate 11 and the post-pouring strip template 8 are tightly fitted together. After the cast-in-place layer 12 and the post-cast strip concrete are completed, remove the locking parts and formwork 8. At this time, the inner tie rod 2 is pre-embedded in the post-cast strip and is fixed together with the concrete. Rotate the outer tie rod 3 with the tightening torque so that the outer tie rod 3 pushes inward. Under the limiting action of the inner tie rod 2, the tightening torque is converted into the transmission torque of the conical nut 4, causing the conical nut 4 to rotate circumferentially, resulting in the effect of the surface of the conical nut 4 separating from the post-cast strip concrete. After the conical nut 4 separates from the post-cast strip concrete, the outer tie rod 3 rotates in place under the action of the tightening torque, which can continue to drive the conical nut 4 to rotate relative to the inner tie rod 2, so that the conical nut 4 separates from the inner tie rod 2. After the conical nut 4 separates from the inner tie rod 2, the outer tie rod 3 and the conical nut 4 can be directly pulled out for secondary reuse.

[0048] In one or more possible embodiments, the locking element includes a U-shaped clip 6 and a nut 7. The U-shaped clip 6 is sleeved with the tie rod and abuts against the template 8; the nut 7 is threadedly connected to the tie rod 3 and abuts tightly against the U-shaped clip 6.

[0049] Furthermore, as another possible implementation, during construction, a horizontal beam 9 can be further installed at the bottom of the formwork 8 of the post-pouring strip. The two ends of the horizontal beam 9 extend laterally to the bottom of the composite slabs 11 on both sides of the post-pouring strip, and the horizontal beams 9 are arranged at intervals along the post-pouring strip; correspondingly, as... Figures 2-4 As shown, based on the above-mentioned construction tool structure, a longitudinal connector 5 is added to connect multiple crossbeams 9 into a whole. The longitudinal connector 5 is connected by multiple locking parts arranged longitudinally, and the locking parts tightly abut against the crossbeams 9. The longitudinal connector 5 is preferably made of steel pipe, which can match the arc-shaped grooves on both sides of the mountain-shaped clamp 6, and has a lightweight, high strength, convenient construction, and good economy.

[0050] Example 2

[0051] Based on Embodiment 1, this embodiment provides a suspended formwork structure for the post-cast strip of a composite slab, such as... Figure 4As shown, it includes several composite slabs 11, with a post-pouring strip between adjacent composite slabs 11. Several of the above-mentioned construction tools are provided in the post-pouring strip. A template 8 is provided at the bottom of the post-pouring strip. The two ends of the template 8 extend laterally to the bottom side of the composite slabs 11 on both sides of the post-pouring strip. The two ends of the lifting rod 1 of the construction tool are respectively placed on the upper side of the composite slabs 11 on both sides of the post-pouring strip. The tie rod 3 of the construction tool passes through the template 8 and is connected to the locking device. The conical nut 4 abuts against the inner side of the template 8.

[0052] Furthermore, in this embodiment, the bottom of the template 8 is provided with a crossbeam 9, the two ends of which extend laterally to the bottom side of the composite slab 11 on both sides of the post-cast strip. The crossbeams 9 are arranged at intervals along the post-cast strip, and the top surface of the crossbeam 9 abuts against the bottom side of the template 8. The bottom of the crossbeam 9 is provided with a longitudinal connector 5, which longitudinally connects multiple crossbeams 9 and is hooked to several locking parts. Among them, the locking parts include a U-shaped clip 6 and a nut 7. The longitudinal connector 5 adopts a steel pipe that matches the U-shaped clip 6 and is symmetrically arranged on both sides of the U-shaped clip 6. The steel pipe is the main load-bearing material, which is lightweight and the round appearance of the steel pipe can fit well with the U-shaped clip 6. It is a surface load-bearing material, which is beneficial to the stability of the overall reinforcement system, and is convenient to construct and economical.

[0053] The tie rods pass through the template 8 and the adjacent crossbeams 9, and are connected in sequence to the mountain-shaped clips 6 and nuts 7. The mountain-shaped clips 6 abut against the longitudinal connecting parts 5, and the longitudinal connecting parts 5 abut against the bottom sides of multiple crossbeams 9, and are pre-tightened by the nuts 7.

[0054] This solution uses longitudinal connectors 5 to support multiple crossbeams 9 longitudinally. Several locking components of construction tools collectively support the longitudinal connectors 5, allowing the preload of the locking components to be transferred through the longitudinal connectors 5 to the multiple crossbeams 9, and then to the formwork 8. This achieves the same effect of tightly fitting the formwork 8 to the composite slab 11 and preventing grout leakage. Furthermore, it eliminates the limitation of the tie rod installation position being restricted by the crossbeam 9 arrangement position, eliminating the need to align the tie rod and locking component positions with the crossbeam 9 positions. This allows for more flexible placement of construction tools and better adaptability to different working conditions. Consequently, it reduces drilling operations on the crossbeams 9, improving construction efficiency.

[0055] Furthermore, with the above-mentioned suspended formwork structure, the crossbeam 9 spans the connection position between the post-pouring strip and the composite slab 11. The top surface of the crossbeam 9 simultaneously supports the composite slab 11 and the template 8, resulting in a large contact area. Under the tensioning action of the tie rods, the crossbeam 9 has better stress resistance, stronger bending resistance, and better fit.

[0056] Furthermore, a longitudinal beam 10 is provided at the bottom of the crossbeam 9. The longitudinal beam 10 is arranged parallel to the longitudinal connector 5. The longitudinal beam 10 is respectively set at the positions of the composite slabs 11 on both sides of the post-pouring strip. A support frame 13 is provided at the bottom of the longitudinal beam 10, which provides structural support to the composite slabs 11 on both sides. This scheme, by setting the crossbeam 9 at the bottom of the formwork 8 and extending the formwork 8 and crossbeam 9 at the bottom of the post-pouring strip laterally to the positions of the composite slabs 11 on both sides, and supporting them under the composite slabs 11 with the longitudinal beam 10 and the ground support, can further ensure the fit between the composite slabs 11 and the formwork 8, and also ensure the flatness of the bottom surface of the concrete poured on the composite slabs 11 and the post-pouring strip. The structural layout is reasonable, the space utilization rate is high, and the construction quality is good.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A construction tool for preventing grout leakage in the post-cast strip of composite slabs, comprising tie rods and locking components, wherein the tie rods include a hanger rod (1), an inner tie rod (2), an outer tie rod (3), and a conical nut (4), the two ends of the hanger rod (1) being used to be horizontally mounted on the composite slabs (11) on both sides of the post-cast strip, the hanger rod (1) being vertically connected to the inner tie rod (2), and the locking component being used to thread-connect the outer tie rod (3), characterized in that, Both the inner pull rod (2) and the outer pull rod (3) are used to be threadedly connected to the conical nut (4), and the threads at both ends of the conical nut (4) are in opposite directions.

2. The construction tool according to claim 1, characterized in that, The conical nut (4) is a metal component.

3. The construction tool according to claim 1, characterized in that, The suspension rod (1) and the inner tie rod (2) are integrally formed components.

4. The construction tool according to any one of claims 1-3, characterized in that, It also includes a longitudinal connector (5) for connecting multiple locking elements.

5. A formwork structure for post-cast strips of composite slabs, characterized in that, It includes several composite slabs (11), and a post-pouring strip is provided between adjacent composite slabs (11). The post-pouring strip is provided with several construction tools as described in any one of claims 1-4. A template (8) is provided at the bottom of the post-pouring strip. The two ends of the template (8) extend laterally to the bottom side of the composite slabs (11) on both sides of the post-pouring strip. The two ends of the lifting rod (1) of the construction tool are respectively placed on the upper side of the composite slabs (11) on both sides of the post-pouring strip. The outer tie rod (3) of the construction tool passes through the template (8) and is connected to a locking member. A conical nut (4) abuts against the inner side of the template (8).

6. The formwork structure for post-cast strip of composite slab according to claim 5, characterized in that, The bottom of the template (8) is provided with a crossbeam (9), the two ends of the crossbeam (9) extend laterally to the bottom side of the composite plate (11) on both sides of the post-pouring strip, and the crossbeam (9) is arranged at intervals along the post-pouring strip; the bottom of the crossbeam (9) is provided with a longitudinal connector (5), the longitudinal connector (5) longitudinally connects multiple crossbeams (9), and the longitudinal connector (5) is connected to multiple locking parts.

7. The formwork structure for post-cast strip of composite slab according to claim 6, characterized in that, The bottom of the crossbeam (9) is provided with a longitudinal beam (10), which is respectively provided with the composite plates (11) on both sides of the post-cast strip. The bottom of the longitudinal beam (10) is provided with a support frame (13), which is used to support the composite plates (11).

8. A formwork structure for post-cast strips of composite slabs according to any one of claims 5-7, characterized in that, The locking component includes a mountain-shaped clip (6) and a nut (7). The longitudinal connecting component (5) is made of a steel pipe that matches the mountain-shaped clip (6). The steel pipe is symmetrically arranged on opposite sides of the mountain-shaped clip (6).

9. A formwork structure for a post-cast strip of a composite slab, comprising a plurality of composite slabs (11), with a post-cast strip between adjacent composite slabs (11), a plurality of tie rods in the post-cast strip, a template (8) at the bottom of the post-cast strip, both ends of the template (8) extending laterally to the bottom sides of the composite slabs (11) on both sides, one end of each tie rod being laterally supported on the upper side of the composite slabs (11) on both sides of the post-cast strip via a hanging rod (1), the other end of each tie rod passing sequentially through the post-cast strip and the template (8) and connected to a locking member, characterized in that, The bottom of the template (8) is provided with a crossbeam (9), the two ends of the crossbeam (9) extend laterally to the bottom side of the composite plate (11) on both sides of the post-pouring strip, and the crossbeam (9) is arranged at intervals along the post-pouring strip; the bottom of the crossbeam (9) is provided with a longitudinal connector (5), the longitudinal connector (5) longitudinally supports multiple crossbeams (9) and is supported by the locking member.

10. A formwork structure for post-cast strips of composite slabs according to claim 9, characterized in that, The bottom of the crossbeam (9) is provided with a longitudinal beam (10), which is respectively located on both sides of the composite plate (11) of the post-cast strip. The bottom of the longitudinal beam (10) is provided with a support frame (13), which is used to support the composite plate (11).

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