A mold for closing openings in steel truss floor decking and its application method

Abstract

This invention provides a mold for closing openings in reinforced truss floor slabs, comprising two opposing reinforcing bar plates, each with a through-hole at its lower end for the reinforcing bar truss to pass through. The two ends of each reinforcing bar plate extend with lower overlapping portions, both located on the same horizontal plane. Also comprising two opposing protective plates, the two reinforcing bar plates and the two protective plates forming a rectangular opening. The two ends of each protective plate extend with upper overlapping portions, which are fitted and overlap each other. The invention also provides a method for using the mold for closing openings in reinforced truss floor slabs. This invention improves upon existing technologies that make it difficult to effectively support openings in reinforced truss floor slabs with molds, while also reducing material waste in the mold.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a mold for closing openings in steel truss floor decking and its usage method. Background Technology

[0002] A steel truss refers to a truss constructed by connecting steel bars as the top chord, bottom chord, and web members using resistance spot welding. A steel truss floor deck refers to a composite load-bearing slab where steel trusses and a base slab (corrugated steel sheet) are connected as a whole by resistance spot welding. During construction, it can withstand the self-weight of wet concrete and construction loads, significantly reducing on-site steel reinforcement binding work, facilitating the assembly and disassembly of prefabricated formwork and connectors, and improving on-site construction progress. During construction, adjacent steel truss floor decks are connected using male and female fasteners to form a unified structure.

[0003] During the use of reinforced steel truss floor decks, it is necessary to reserve locations for openings. Simultaneously, to ensure the overall structural strength and load-bearing capacity of the steel truss, as well as the quality of the concrete after construction, the reinforcing bars and steel plates of the floor deck can only be cut when the concrete reaches 75% of its design strength. Therefore, in existing technology, openings are reserved in the reinforced steel truss floor deck by using formwork. After the concrete layer reaches its strength, the formwork is removed and the reinforced steel truss floor deck is cut to form the opening.

[0004] One existing construction method involves using wooden formwork to create openings. The wooden formwork is secured with steel nails, and serrated notches are pre-cut in the formwork to allow the steel truss to pass through. Steel bars or wires are tied at these notches to intercept the concrete. This method involves removing the wooden formwork after the concrete slab has formed, but this typically results in high formwork wear. Another existing construction method, for concrete columns and beams poured in stages, involves placing wire mesh around the openings to intercept the concrete. This involves tying the wire mesh to the steel truss to form an enclosure around the opening. However, for steel truss floor slabs, where the concrete pouring height exceeds the truss reinforcement, the wire mesh tied to the truss cannot provide the same effective interception for the concrete layers above the truss as it does for the lower layers. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a mold for closing openings in steel truss floor slabs and a method for using it. This invention can improve the existing technology by making it difficult to effectively support openings in steel truss floor slabs with molds, while also reducing the waste of mold materials.

[0006] On one hand, according to an embodiment of the present invention, a mold for closing an opening in a steel truss floor slab includes two through-beam plates arranged facing each other, with through-beam holes for steel trusses to pass through at the lower end of the through-beam plates, and lower lap joints extending from both ends of the through-beam plates along their length, the two lower lap joints being located on the same horizontal plane; and two guard plates arranged facing each other, with the two through-beam plates and the two guard plates surrounding each other to form a rectangular opening, the upper lap joints extending from both ends of the guard plates along their length, the upper lap joints and the lower lap joints being adapted to and overlapping each other.

[0007] By adopting the above technical solution, two through-beam plates and two guard plates are arranged alternately to form a rectangular opening for placement on the floor slab. At the same time, through-beam holes are opened for the steel truss to pass through. During the concrete pouring process, the overlapping upper and lower joints bear the extrusion pressure of the concrete, maintaining the shape of the mold that closes the opening, ensuring the structural strength of the mold, and improving the problem of inconvenient effective mold support for the steel truss floor slab opening in the existing technology. At the same time, by using the overlapping of the upper and lower joints, when demolding, since the two upper or two lower joints are on the same horizontal plane, the through-beam plate or guard plate with the upper joint can be lifted to complete the demolding work. The demolding and assembly method is simple and fast, and can reduce the problem of mold damage and material waste.

[0008] Preferably, the reinforcing plate includes: a first reinforcing plate, not less than one, with the reinforcing hole opened in the first reinforcing plate, and the lower lap joint provided on the end side of the first reinforcing plate; a second reinforcing plate, not less than one, with the reinforcing hole also opened in the second reinforcing plate, and the two ends of the second reinforcing plate extending out with a first lap joint adapted to and lapped to the lower lap joint or the upper lap joint; and a first connecting rod, having multiple rods, and the first connecting rod simultaneously inserted into the lower lap joint and the first lap joint, or the lower lap joint and the upper lap joint, or the first lap joint and the upper lap joint.

[0009] By adopting the above technical solution, when forming a mold for closing an opening by overlapping, the number of No. 1 and No. 2 through-rigid plates can be selected according to the required size of the opening, thereby changing the overall size of the mold and improving its practicality. At the same time, the setting of No. 1 through-rigid plate, No. 2 through-rigid plate and No. 1 connecting rod makes the through-rigid plates easy to disassemble and replace, and the space occupied during transportation is smaller. In case of local damage, only the No. 1 or No. 2 through-rigid plate that is damaged in that area needs to be replaced, thus reducing material waste.

[0010] Preferably, a first slot is vertically formed on the side of the lower overlapping part, and the first overlapping part is provided with a first card plate that is adapted to and inserted downward into the first slot.

[0011] By adopting the above technical solution, the connection strength between the No. 1 and No. 2 reinforcing slabs is enhanced by inserting the No. 1 clamping plate into the No. 1 clamping slot. Since the No. 1 clamping plate is inserted vertically downward into the No. 1 clamping slot, that is, in the vertical direction, the horizontal plane of the No. 1 overlap is higher than the vertical plane of the lower overlap, meaning the upper overlap is higher than the vertical plane of the lower overlap. During disassembly, because some concrete will flow into and solidify in the reinforcing hole, it is easier, more convenient, and smoother to disassemble the protective plate above the end of the reinforcing slab first than to disassemble the reinforcing slab first. At the same time, since the No. 1 clamping slot is connected to the side of the lower overlap, after the No. 1 clamping plate is inserted, the No. 1 clamping plate forms a sealing effect on the connection gap between the No. 1 and No. 2 reinforcing slabs, reducing the possibility of concrete slurry seepage.

[0012] Preferably, the guard plate includes: a first guard plate, not less than one, and the upper overlapping portion is disposed on the end side of the first guard plate; a second guard plate, not less than one, and the two ends of the second guard plate have second overlapping portions that are adapted to and overlap with the upper overlapping portion; and a second connecting rod, multiple of which are provided, and the second connecting rod is simultaneously inserted into the upper overlapping portion and the second overlapping portion, or the lower overlapping portion and the upper overlapping portion.

[0013] By adopting the above technical solution, when forming a mold to close an opening, the number of No. 1 and No. 2 protective plates can be selected according to the required size of the opening, thereby changing the overall size of the mold and further improving its practicality. At the same time, the setting of No. 1 protective plate, No. 2 protective plate and No. 2 connecting rod makes the protective plates easy to disassemble and replace, and the space occupied during transportation is smaller. In case of local damage, only the damaged No. 1 or No. 2 protective plate needs to be replaced, reducing material waste.

[0014] Preferably, the second overlapping part has a second slot vertically opened on its side, and the upper overlapping part is provided with a second card plate that is adapted to and inserted downward into the second card slot; the second card plate is adapted to and inserted into the first card slot.

[0015] By adopting the above technical solution, the connection strength between the second overlap and the upper overlap is enhanced by inserting the second card into the second slot. Since the second card is inserted vertically downward into the second slot, that is, in the vertical direction, the horizontal plane of the upper overlap is higher than the vertical plane of the second overlap. And since the second slot is connected to the side of the second overlap, the second card forms a sealing effect on the connection gap between the first and second guard plates after insertion, reducing the possibility of concrete slurry seepage. In addition, since the second card fits and is inserted into the first slot, the connection strength between the first guard plate and the first through-stirrup plate is further enhanced, that is, the structural strength between the through-stirrup plate and the guard plate is enhanced.

[0016] Preferably, the second connecting rod and the first connecting rod are the same size.

[0017] By adopting the above technical solution, when the guard plate is overlapped on the through-stirring plate, the number of connecting rods No. 2 or No. 1 can be reduced, and the versatility of connecting rods No. 2 and No. 1 can be enhanced.

[0018] Preferably, the first connecting rod is threaded to the lower overlapping part, and the second connecting rod is threaded to the second overlapping part or the lower overlapping part.

[0019] By adopting the above technical solution, the threaded connection prevents the first and second connecting rods from coming off. When disassembling the reinforcing plate and the guard plate upwards, the threaded connection ensures that the guard plate and the reinforcing plate remain in a straight plate state, making it easy to remove them in one go.

[0020] Preferably, multiple sealing rods are provided on the opposite side of both reinforcing plates, and the sealing rods and the reinforcing holes are located on the same horizontal plane to facilitate the installation of wire mesh.

[0021] By adopting the above technical solution, it is easy to seal the reinforcement hole by installing wire mesh on the sealing rod to intercept the poured concrete.

[0022] Preferably, the length of the lower overlap is equal to the thickness of the guard plate, and the length of the upper overlap is equal to the thickness of the reinforcing plate.

[0023] By adopting the above technical solution, the smoothness of the outer side of the protective plate and the reinforcing bar plate can be relatively guaranteed, thereby ensuring the flatness of the opening edge after the concrete layer is formed.

[0024] On the other hand, according to an embodiment of the present invention, a method for using a mold for closing openings in steel truss floor decks is also provided, which includes the following steps: according to the design size of the opening in the steel truss floor deck, first place two reinforcing bar plates opposite each other on the floor slab; then place two protective plates on the floor deck, such that the upper overlap overlaps the lower overlap; finally, install wire mesh on the sealing rod.

[0025] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0026] 1. By setting two through-beam plates and two guard plates to be placed on the floor deck and forming a rectangular opening, and simultaneously opening through-beam holes for the steel truss to pass through, during the concrete pouring process, the overlapping upper and lower lap joints bear the extrusion pressure of the concrete, maintaining the shape of the mold that closes the opening, ensuring the structural strength of the mold, and improving the problem of inconvenient effective mold support for steel truss floor deck openings in existing technologies; at the same time, by using the overlapping of the upper and lower lap joints, during demolding, since the two upper lap joints or two lower lap joints are on the same horizontal plane, the through-beam plate or guard plate above the lap joint can be lifted to complete the demolding work. The demolding and assembly method is simple and fast, and can reduce the problem of mold damage and material waste;

[0027] 2. By setting No. 1 through-rib plate, No. 2 through-rib plate, No. 1 guard plate, and No. 2 guard plate, the overall size of the mold can be adjusted according to the size of the opening, improving practicality. At the same time, the through-rib plates and guard plates are easy to disassemble and replace, and occupy less space during transportation. In case of local damage, only the damaged No. 1 through-rib plate, No. 2 through-rib plate, No. 1 guard plate, or No. 2 guard plate needs to be replaced, reducing material waste. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0029] Figure 2 This is a partial exploded structural diagram of an embodiment of the present invention, mainly showing the connection structure of the through-stiffener plate and the protective plate;

[0030] Figure 3 This is an exploded structural diagram of the through-rib plate according to an embodiment of the present invention;

[0031] Figure 4 This is an exploded structural diagram of the protective plate according to an embodiment of the present invention.

[0032] In the above attached figures: 1. Through-stitch plate; 11. First through-stitch plate; 111. Lower lap joint; 112. First slot; 12. Second through-stitch plate; 121. First lap joint; 122. First slot plate; 13. First connecting rod; 2. Through-stitch hole; 21. Sealing rod; 3. Guard plate; 31. First guard plate; 311. Upper lap joint; 312. Second slot plate; 32. Second guard plate; 321. Second lap joint; 322. Second slot plate; 33. Second connecting rod. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described below.

[0034] Reference Figure 1 and Figure 2On the one hand, the present invention provides a mold for closing the opening of a steel truss floor slab. The opening is reserved through the mold so that the concrete layer can be built later. After the concrete layer solidifies, the mold is removed to form the opening of the steel truss floor slab.

[0035] Specifically, the steel truss floor deck slab opening closure mold of the present invention includes two opposing through-beam plates 1 and two opposing guard plates 3, which are staggered to form a rectangular opening. Multiple through-beam holes 2 are provided at the lower end of the through-beam plates 1 for the steel truss to pass through. Lower overlapping portions 111 are integrally formed at both ends of the through-beam plates 1 along their length, with the two lower overlapping portions 111 located on the same horizontal plane. Upper overlapping portions 311 extend from both ends of the guard plates 3 along their length, and the upper overlapping portions 311 and lower overlapping portions 111 are adapted to and overlap each other, with vertical insertion holes provided on the upper overlapping portions 311.

[0036] In use, the reinforcing bar plate 1, the protective plate 3, the reinforcing bar plate 1, and the protective plate 3 are placed sequentially on the floor deck to form an opening. During placement, the steel truss passes through the reinforcing bar hole 2, and the upper lap joint 311 and the lower lap joint 111 overlap each other, maintaining the stability of the entire mold through their overlap. At the same time, during the concrete pouring process, the upper lap joint 311 and the lower lap joint 111 overlap each other, allowing the entire mold to withstand the compressive force from the concrete. Compared with the existing technology that requires the use of steel nails or wires for fixing, this mold is easier to assemble and disassemble, improving the problem of the existing technology that is not convenient for effectively supporting the steel truss floor deck opening. Moreover, during the disassembly process, the reinforcing bar plate 1 and the protective plate 3 can be lifted up, reducing the problem of mold damage and material waste.

[0037] In this embodiment of the invention, the length of the lower overlap 111 is equal to the thickness of the protective plate 3, and the length of the upper overlap 311 is equal to the thickness of the reinforcing bar 1, so as to ensure the smoothness of the outer side of the protective plate 3 and the reinforcing bar 1, thereby ensuring the flatness of the opening edge after the concrete layer is formed and improving the construction quality.

[0038] As one embodiment of the present invention, in the vertical direction, the height of the lower overlapping part 111 is lower than the height of the upper overlapping part 311. That is, the upper overlapping part 311 overlaps the lower overlapping part 111 from top to bottom. When the concrete layer is formed, when removing the mold, the protective plate 3 is lifted from bottom to top and then the through-stitch plate 1 is removed. Since the concrete will flow into the through-stitch hole 2 during the pouring process, this removal method is smoother than removing the through-stitch plate 1 first, and the possibility of the entire mold being damaged is very small.

[0039] In another embodiment of the present invention, the height of the lower overlapping part 111 is higher than the height of the upper overlapping part 311 in the vertical direction. In this embodiment, when removing the mold, the through-stitch plate 1 needs to be lifted up and removed first, and then the guard plate 3 needs to be removed.

[0040] Reference Figure 2 and Figure 3 In one embodiment, the reinforcing plate 1 includes at least one No. 1 reinforcing plate 11, at least one No. 2 reinforcing plate 12, and multiple No. 1 connecting rods 13. In this embodiment, the reinforcing holes 2 are all opened in the No. 1 reinforcing plate 11 and the No. 2 reinforcing plate 12, and the lower overlapping part 111 is provided on the end side of the No. 1 reinforcing plate 11, specifically located on both sides of the lower end of the No. 1 reinforcing plate 11 in the vertical direction; wherein, the lower overlapping part 111 is also provided with vertical insertion holes.

[0041] One overlapping portion 121 extends from both ends of the second through-rib plate 12. The first overlapping portion 121 fits and overlaps with the lower overlapping portion 111 (the figure illustrates this by taking the first overlapping portion 121 overlapping downwards with the lower overlapping portion 111 as an example). A vertical insertion hole is provided on the first overlapping portion 121, which can communicate with the insertion hole of the lower overlapping portion 111. Alternatively, in other embodiments, when the height of the lower overlapping portion 111 is higher than that of the upper overlapping portion 311 in the vertical direction, the first overlapping portion 121 can also overlap the upper overlapping portion 311.

[0042] Since the lower overlapping portions 111 at both ends of the reinforcing plate 1 are located on the same horizontal plane, the total number of the first reinforcing plate 11 and the second reinforcing plate 12 is an odd number and not less than 3. Preferably, the height of the lower overlapping portion 111 is lower than the height of the upper overlapping portion 311, that is, the first reinforcing plate 11 is an even number and the second reinforcing plate 12 is an odd number.

[0043] In a preferred embodiment of the present invention, the first connecting rod 13 is simultaneously inserted into the insertion holes of the lower overlapping part 111 and the first overlapping part 121 to prevent the first through-stitch plate 11 and the second through-stitch plate 12 from separating. In this embodiment, the first connecting rod 13 can also be simultaneously inserted into the insertion holes of the lower overlapping part 111 and the upper overlapping part 311 to prevent the lower overlapping part 111 and the upper overlapping part 311 from separating.

[0044] In other embodiments, when the height of the lower overlapping part 111 is higher than the height of the upper overlapping part 311, the first connecting rod 13 can also be inserted into the first overlapping part 121 and the upper overlapping part 311 at the same time to prevent the reinforcing plate 1 from separating from the guard plate 3 when the upper overlapping part 311 is located at the end of the reinforcing plate 1.

[0045] When assembling the reinforcing slab 1, select the number of reinforcing slabs 11 and 12 according to the preset opening size to adjust the overall size of the mold.

[0046] In one embodiment, when the height of the lower overlapping portion 111 is lower than the height of the upper overlapping portion 311, the insertion hole of the lower overlapping portion 111 is an internally threaded hole, and the lower end of the first connecting rod 13 is threaded into this internally threaded hole to prevent the first connecting rod 13 from disengaging. Simultaneously, when lifting, force can be applied to the first connecting rod 13, making it convenient to use. In this embodiment, a handle is provided at the upper end of the first connecting rod 13 for applying force.

[0047] Based on the above preferred embodiment, a first slot 112 is vertically provided on the side of the lower overlapping part 111. The first slot 112 is a dovetail groove or a stepped groove (shown as a dovetail groove in the figure). The first overlapping part 121 is provided with a first card plate 122 that is adapted to and inserted downward into the first slot 112. The cross-section of the first card plate 122 in the figure is shown as a dovetail shape.

[0048] When connecting the No. 2 reinforcing plate 12 to the No. 1 reinforcing plate 11 from top to bottom, the No. 1 overlapping part 121 overlaps the lower overlapping part 111, and the No. 1 clamping plate 122 is inserted downward into the No. 1 clamping groove 112, so as to realize the connection between the No. 1 reinforcing plate 11 and the No. 2 reinforcing plate 12, while preventing the two from moving relative to each other and maintaining the overall straightness of the reinforcing plate 1.

[0049] Reference Figure 2 and Figure 4 The guard plate 3 includes at least one first guard plate 31, at least one second guard plate 32, and multiple second connecting rods 33. The upper overlapping part 311 is provided on the end side of the first guard plate 31. As a preferred example, in the vertical direction, the upper overlapping part 311 is provided on both sides of the upper end of the first guard plate 31. The first guard plate 31 is provided with at least two pieces so that it can be overlapped with the lower overlapping part 111 through the upper overlapping part 311.

[0050] The second guard plate 32 has two overlapping portions 321 extending from both ends, and these overlapping portions 321 overlap with the upper overlapping portion 311. Insertion holes are provided at the overlapping portions of both the upper overlapping portion 311 and the second overlapping portion 321. The second connecting rod 33 is simultaneously inserted into the insertion holes of both the upper overlapping portion 311 and the second overlapping portion 321 to prevent the first guard plate 31 and the second guard plate 32 from detaching.

[0051] In one embodiment, the upper overlapping portion 311 and the lower overlapping portion 111 have the same insertion hole size, so that the second connecting rod 33 can be inserted into the insertion holes of both the lower overlapping portion 111 and the upper overlapping portion 311 simultaneously. Furthermore, the second connecting rod 33 has the same size as the first connecting rod 13, and both have external threads at their lower ends, allowing the second connecting rod 33 and the first connecting rod 13 to be interchangeable, thus reducing costs.

[0052] In one embodiment, a second slot 322 is vertically provided on the side of the second overlapping part 321. The second slot 322 is a dovetail slot or a stepped slot (shown as a dovetail slot in the figure), and the upper overlapping part 311 is provided with a second card plate 312 that is adapted to and inserted downward into the second slot 322. In this embodiment of the invention, the second card plate 312 is adapted to and inserted into the first slot 112.

[0053] When connecting the first guard plate 31 to the second guard plate 32 from top to bottom, the upper overlapping part 311 overlaps the second overlapping part 321, and the second clamping plate 312 is inserted downward into the second clamping groove 322, thereby connecting the first guard plate 31 and the second guard plate 32 and preventing them from moving relative to each other, thus maintaining the overall straightness of the guard plate 3. At the same time, the first guard plate 31 is connected to the first through-rib plate 11 from top to bottom, with the upper overlapping part 311 overlapping the lower overlapping part 111, and the second clamping plate 312 is adapted to and inserted into the first clamping groove 112 to prevent them from moving relative to each other and maintain the overall structural strength of the mold.

[0054] Reference Figure 1 According to another embodiment of the present invention, the mold for closing the opening of the steel truss floor deck also includes multiple sealing rods 21. The sealing rods 21 are fixed on one side of the two through-beam plates 1 facing each other, and the sealing rods 21 and the through-beam holes 2 are located on the same horizontal plane, so that after the mold is installed, the through-beam holes 2 can be further blocked by installing wire mesh on the sealing rods 21 to reduce the outflow of concrete.

[0055] On the other hand, this invention also proposes a method for using a mold for closing openings in steel truss floor slabs, which includes the following steps:

[0056] According to the design size of the opening of the steel truss floor deck, first place the two through-beam plates 1 opposite each other on the floor slab. During this process, place the second through-beam plate 12 on the first through-beam plate 1, and insert the first clamping plate 122 downward into the first clamping slot 112; then insert the first connecting rod 13.

[0057] Then place the two protective plates 3 on the floor deck, so that the upper overlapping part 311 overlaps the lower overlapping part 111, the second card plate 312 is adapted and inserted downward into the first card slot 112, the second card plate 312 is inserted downward into the second card slot 322, and the second connecting rod 33 is inserted.

[0058] Finally, install the wire mesh on the sealing rod 21.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A mold for closing openings in steel truss floor decking, characterized in that, include: Two reinforcing slabs (1) are arranged facing each other, and the lower end of the reinforcing slabs (1) is provided with reinforcing holes (2) for the steel truss to pass through. The two ends of the reinforcing slabs (1) in the length direction have lower lap joints (111) extending out, and the two lower lap joints (111) are located on the same horizontal plane. The through-stiffening plate (1) includes: There is at least one No. 1 through-stitch plate (11), and the through-stitch hole (2) is opened on the No. 1 through-stitch plate (11), and the lower lap joint (111) is provided on the end side of the No. 1 through-stitch plate (11). There is at least one No. 2 through-stitch plate (12), and the through-stitch hole (2) is opened on the No. 2 through-stitch plate (12). Both ends of the No. 2 through-stitch plate (12) have a No. 1 lap joint (121) that is adapted to and overlaps the lower lap joint (111) or the upper lap joint (311). And a first connecting rod (13), multiple of which are provided, and the first connecting rod (13) is simultaneously inserted into the lower overlapping part (111) and the first overlapping part (121), or the lower overlapping part (111) and the upper overlapping part (311), or the first overlapping part (121) and the upper overlapping part (311); the side of the lower overlapping part (111) is vertically provided with a first slot (112), and the first overlapping part (121) is provided with a first card plate (122) that is adapted to and inserted downward into the first slot (112). And the guard plate (3), two of which are arranged facing each other, and the two through plates (1) and the two guard plates (3) surround each other to form a rectangular opening. The two ends of the guard plate (3) in the length direction have an upper overlapping part (311), and the upper overlapping part (311) and the lower overlapping part (111) are adapted to each other and overlap. The guard plate (3) includes: There is at least one first guard plate (31), and the upper overlapping part (311) is provided on the end side of the first guard plate (31); There is at least one second guard plate (32), and the two ends of the second guard plate (32) have second overlapping parts (321) that are adapted to and overlap the upper overlapping part (311). And a second connecting rod (33) is provided in multiple forms, and the second connecting rod (33) is simultaneously inserted into the upper overlapping part (311) and the second overlapping part (321), or the lower overlapping part (111) and the upper overlapping part (311); the side of the second overlapping part (321) is provided with a second slot (322) vertically, and the upper overlapping part (311) is provided with a second card plate (312) that is adapted to and inserted downward into the second card slot (322); the second card plate (312) is adapted to and inserted into the first card slot (112).

2. The mold for closing openings in steel truss floor slabs according to claim 1, characterized in that, The second connecting rod (33) and the first connecting rod (13) are the same size.

3. The mold for closing openings in steel truss floor slabs according to claim 2, characterized in that, The first connecting rod (13) is threaded to the lower overlapping part (111), and the second connecting rod (33) is threaded to the second overlapping part (321) or the lower overlapping part (111).

4. The mold for closing openings in steel truss floor slabs according to claim 1, characterized in that, Multiple sealing rods (21) are provided on the opposite side of the two reinforcing plates (1). The sealing rods (21) and the reinforcing holes (2) are located on the same horizontal plane so as to install wire mesh.

5. The mold for closing openings in steel truss floor slabs according to claim 1, characterized in that, The length of the lower overlap (111) is equal to the thickness of the guard plate (3), and the length of the upper overlap (311) is equal to the thickness of the reinforcing plate (1).

6. A method for using the formwork for closing openings in steel truss floor slabs as described in any one of claims 1-5, characterized in that, It includes the following steps: According to the design size of the opening of the steel truss floor deck, first place two reinforcing plates (1) opposite each other on the floor deck; then place two protective plates (3) on the floor deck, and make the upper lap joint (311) overlap the lower lap joint (111); finally install wire mesh on the sealing rod (21).

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