Connecting fastener between steel bar truss and formwork

Abstract

The utility model discloses a connecting fastener between a steel bar truss and a template, which belongs to the field of building construction workpieces, and comprises an injection molding part body used for connecting a bottom die and a cement cushion block and supporting the steel bar truss, and a strip-shaped hole positioning block and a badminton-shaped hole positioning block which are arranged on the injection molding part body and are respectively arranged at two ends, two elevated blocks are oppositely arranged at the two ends of the bottom of the injection molding part body, mounting grooves are formed in the bottoms of the elevated blocks, the cement cushion blocks are inserted into the mounting grooves, and the cement cushion blocks and the mounting grooves are designed to be frustum-shaped. According to the connecting fastener, the inserting hole in the cement cushion block is aligned with the screw mounting pipe in the mounting groove, the cement cushion block is pushed, the cement cushion block is clamped with the frustum cavity of the mounting groove, the inserting hole is clamped with the frustum-shaped screw mounting pipe, and therefore the stability of connection between the cement cushion block and the injection molding part body is improved; and then the bottom frame body of the steel bar truss is inserted into the strip-shaped hole positioning blocks and the badminton-shaped hole positioning blocks, so that the stability is better.

Description

Technical Field

[0001] This application relates to the field of building construction workpiece technology, specifically a connecting fastener between a steel truss and a formwork. Background Technology

[0002] A truss constructed by resistance spot welding steel bars as the top chord, bottom chord, and web members is called a steel truss. A composite load-bearing slab formed by resistance spot welding the steel truss to the base slab is called a steel truss floor deck. There are generally two types of base slabs for truss floor decks: cement slabs and wooden slabs. Prefabricated steel truss floor decks can significantly reduce on-site steel bar tying work, accelerate construction progress, increase construction safety, and achieve civilized construction. For traditional removable formwork steel truss slabs currently in use, after the formwork is removed, some areas of the injection-molded connectors are exposed at the bottom of the floor slab. Due to the non-fire-resistant nature of the injection molding material and the problem of poor adhesion between the injection molding material and the decorative materials at the bottom of the floor slab, the connectors of traditional removable steel truss slabs present technical challenges.

[0003] Chinese utility model patent CN221545937U3 discloses a detachable bottom formwork injection-molded connector for steel truss slabs with cement blocks. It connects the injection-molded connector body to the bottom formwork by inserting a screw mounting tube through a through hole in the center of the cement block and inserting the cement block into its groove. Self-tapping screws are then inserted through the screw mounting tube and connected to the bottom formwork below, increasing installation strength. The screw mounting tube ensures that the self-tapping screws do not harden in the concrete after pouring, facilitating subsequent removal. Furthermore, after the bottom formwork is removed, the cement block is exposed at the screw holes in the floor slab, rather than the injection-molded material, ensuring material consistency at the bottom of the floor slab and facilitating subsequent decorative treatment. However, during construction, the stability of the cement block installation is poor, and the connection between the cement block and the cement block groove is also poor.

[0004] Therefore, this application provides a connecting fastener between a steel truss and a formwork to solve the above-mentioned problems. Utility Model Content

[0005] This application provides a connecting fastener between a steel truss and a formwork, which aims to solve the problems of unstable installation of cement pads mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a connecting fastener between a steel truss and a formwork, comprising an injection-molded body for connecting the bottom formwork and a cement pad block and supporting the steel truss, and strip-shaped hole positioning blocks and badminton shuttlecock-shaped hole positioning blocks respectively disposed at both ends on the injection-molded body:

[0007] Two support blocks are positioned opposite each other at the bottom ends of the injection molded part body. The bottom of the support blocks is provided with an installation groove. The cement pad is inserted into the installation groove. Both the cement pad and the installation groove are designed in a frustum shape.

[0008] A screw mounting tube is fixedly installed in the mounting groove. An insertion hole is provided on the cement block, and the screw mounting tube is inserted into the insertion hole. A self-tapping screw, threaded through the bottom mold and screwed to the screw mounting tube, is also provided. Both the screw mounting tube and the insertion hole are frustoconical in design. In use, the insertion hole on the cement block is aligned with the screw mounting tube in the mounting groove, and the cement block is pushed, causing it to engage with the frustoconical cavity of the mounting groove, and the insertion hole to engage with the frustoconical screw mounting tube. This improves the stability of the connection between the cement block and the injection-molded part. Then, the bottom frame of the steel truss is inserted into the strip-shaped hole positioning block and the badminton-shaped hole positioning block, further enhancing stability.

[0009] Preferably, in order to secure the cement pad, both the cement pad and the mounting groove are designed in the shape of a frustum pyramid. The cross-sectional area of ​​the cavity of the mounting groove gradually increases from the end near the bottom of the injection molded part to the end away from the injection molded part, and the cross-sectional area of ​​the cement pad gradually increases from the end entering the mounting groove to the end away from the mounting groove, thereby improving the stability of the engagement between the mounting groove and the cement pad.

[0010] Preferably, in order to secure the cement pad, both the screw mounting tube and the insertion hole are designed in a frustum conical shape. The diameter of the screw mounting tube gradually decreases from the end near the bottom of the injection molded part to the end away from the injection molded part, and the inner diameter of the insertion hole gradually decreases from the end near the cement pad entering the mounting groove to the end away from the mounting groove, thereby improving connection stability.

[0011] Preferably, for ease of connection, the outer side wall of the screw mounting tube has an R0.5 rounded chamfer at the end away from the injection molded part body, and the inner side wall of the screw mounting tube has an R2 rounded chamfer at the end away from the injection molded part body. This allows for more accurate and convenient insertion into the screw mounting tube, improving the ease of connection.

[0012] Preferably, to facilitate casting, a number of evenly distributed injection holes are provided on the injection molded part body between the strip-shaped hole positioning block and the badminton-shaped hole positioning block, and a reinforcing plate is fixedly installed on one side of the badminton-shaped hole positioning block on the injection molded part body, thereby improving the casting efficiency.

[0013] Preferably, in order to reduce losses, symmetrically distributed weight-reducing grooves are provided on the outer walls of both ends of the strip-shaped hole positioning block and the badminton-shaped hole positioning block on the injection molded part body, which facilitates its widespread use.

[0014] The connecting fastener aligns the insertion hole on the cement block with the screw mounting tube in the mounting groove, pushes the cement block so that it engages with the frustum-shaped cavity of the mounting groove, and the insertion hole engages with the frustum-shaped screw mounting tube, thereby improving the stability of the connection between the cement block and the injection molded part body. Then, the bottom frame of the steel truss is inserted into the strip-shaped hole positioning block and the badminton-shaped hole positioning block, which further enhances the stability.

[0015] This connecting fastener has weight-reducing grooves at both ends when manufacturing the injection molded part, which reduces weight and material costs, making it easier to promote and use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of a connecting fastener between a steel truss and a formwork.

[0017] Figure 2 This is a schematic diagram of the bottom structure of a connecting fastener between a steel truss and a formwork.

[0018] Figure 3 This is a cross-sectional structural diagram of a fastener connecting a steel truss and a formwork.

[0019] In the picture:

[0020] 1. Bottom mold; 2. Cement pad; 21. Insertion hole; 3. Steel truss; 4. Injection molded part body; 41. Strip hole positioning block; 42. Badminton shuttlecock hole positioning block; 43. Elevating block; 44. Mounting groove; 45. Screw mounting tube; 46. Self-tapping screw; 47. Injection hole; 48. Reinforcing plate; 49. Weight reduction groove. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Example 1

[0023] This embodiment provides a connecting fastener between a steel truss and formwork, such as... Figure 1-3 As shown, the connecting fastener includes an injection-molded body 4 for connecting the bottom mold 1 and the cement pad 2 and supporting the steel truss 3, and strip-shaped hole positioning blocks 41 and badminton shuttlecock-shaped hole positioning blocks 42 located at both ends on the injection-molded body 4.

[0024] At the bottom ends of the injection molded part body 4, there are two support blocks 43 facing each other. The bottom of the support block 43 is provided with an installation groove 44. The cement pad 2 is inserted into the installation groove 44. Both the cement pad 2 and the installation groove 44 are frustoconical designs.

[0025] A screw mounting tube 45 is fixedly installed in the mounting groove 44. An insertion hole 21 is opened on the cement block 2. The screw mounting tube 45 is inserted into the insertion hole 21. A self-tapping screw 46 is threaded through the bottom mold 1 and screwed to the screw mounting tube 45. Both the screw mounting tube 45 and the insertion hole 21 are frustoconical designs.

[0026] In use, align the insertion hole 21 on the cement block 2 with the screw mounting tube 45 in the mounting groove 44, push the cement block 2 so that the cement block 2 engages with the frustum-shaped cavity of the mounting groove 44, and the insertion hole 21 engages with the frustum-shaped screw mounting tube 45, thereby improving the stability of the connection between the cement block 2 and the injection molded part body 4. Then, insert the bottom frame of the steel truss 3 into the strip-shaped hole positioning block 41 and the badminton shuttlecock-shaped hole positioning block 42 for even better stability.

[0027] Specifically, both the cement block 2 and the mounting groove 44 are designed in the shape of a frustum pyramid. The cross-sectional area of ​​the cavity of the mounting groove 44 gradually increases from the end near the bottom of the injection molded part body 4 to the end away from the injection molded part body 4. The cross-sectional area of ​​the cement block 2 gradually increases from the end that enters the mounting groove 44 to the end that moves away from the mounting groove 44.

[0028] When in use, the smaller end of the cement pad 2 is inserted into the mounting groove 44 as the entry end, forming an embedded effect with the raised block 43, which improves the stability of the connection between the mounting groove 44 and the cement pad 2.

[0029] More specifically, both the screw mounting tube 45 and the insertion hole 21 are designed in the shape of a frustum cone. The diameter of the screw mounting tube 45 gradually decreases from the end near the bottom of the injection molded part body 4 to the end away from the injection molded part body 4. The inner diameter of the insertion hole 21 gradually decreases from the end near the cement pad 2 entering the mounting groove 44 to the end away from the mounting groove 44.

[0030] In use, the large-diameter end of the insertion hole 21 on the cement pad 2 is used as the entry end and fitted onto the screw mounting tube 45 to further tighten the cement pad 2 and improve the connection stability.

[0031] Furthermore, the outer side wall of the screw mounting tube 45, away from the injection molded part body 4, is designed with an R0.5 rounded chamfer, and the inner side wall of the screw mounting tube 45, away from the injection molded part body 4, is designed with an R2 rounded chamfer.

[0032] When in use, the inner and outer walls of the screw mounting tube 45 are chamfered so that when the cement pad 2 is inserted into the mounting groove 44, its insertion hole 21 can be more easily aligned and inserted into the screw mounting tube 45. When installing the self-tapping screw 46, it can be inserted into the screw mounting tube 45 more accurately and conveniently, improving the convenience of connection.

[0033] Furthermore, a number of evenly distributed injection holes 47 are provided on the injection molded part body 4 between the strip-shaped hole positioning block 41 and the badminton shuttlecock-shaped hole positioning block 42, and a reinforcing plate 48 is fixedly installed on one side of the badminton shuttlecock-shaped hole positioning block 42 on the injection molded part body 4.

[0034] During use, when pouring cement mortar, the cement mortar flows through the grouting hole 47 to the bottom of the injection molded part body 4, thereby improving the pouring efficiency. The reinforcing plate 48 abuts against the side of the badminton ball-shaped hole positioning block 42, enhancing the support effect of the badminton ball-shaped hole positioning block 42 and ensuring the stable connection of the steel truss 3.

[0035] Example 2

[0036] Unlike Embodiment 1, the injection molded part body 4 is too heavy and not conducive to handling and use. Therefore, symmetrically distributed weight-reducing grooves 49 are provided on the outer side walls of both ends of the strip hole positioning block 41 and the badminton ball-shaped hole positioning block 42 on the injection molded part body 4.

[0037] When using it, when making the injection molded part body 4, weight reduction grooves 49 are made at both ends to reduce weight and material costs, making it easier to promote and use.

[0038] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A connecting fastener between a steel truss and a formwork, comprising an injection-molded body (4) for connecting a bottom formwork (1) and a cement pad (2) and supporting the steel truss (3), and strip-shaped hole positioning blocks (41) and badminton shuttlecock-shaped hole positioning blocks (42) respectively disposed at both ends on the injection-molded body (4), characterized in that: The injection molded part body (4) has two support blocks (43) facing each other at both ends of the bottom. The support blocks (43) have an installation groove (44) at the bottom. The cement pad (2) is inserted into the installation groove (44). Both the cement pad (2) and the installation groove (44) are frustoconical. A screw mounting tube (45) is fixedly installed in the mounting groove (44). An insertion hole (21) is provided on the cement pad (2). The screw mounting tube (45) is inserted into the insertion hole (21). A self-tapping screw (46) is provided through the bottom mold (1) and screwed to the screw mounting tube (45). Both the screw mounting tube (45) and the insertion hole (21) are frustoconical.

2. The connecting fastener between a steel truss and a formwork according to claim 1, characterized in that: Both the cement pad (2) and the mounting groove (44) are designed in the shape of a frustum pyramid. The cross-sectional area of ​​the cavity of the mounting groove (44) gradually increases from the end near the bottom of the injection molded part body (4) to the end away from the injection molded part body (4). The cross-sectional area of ​​the cement pad (2) gradually increases from the end that enters the mounting groove (44) to the end that is away from the mounting groove (44).

3. The connecting fastener between a steel truss and a formwork according to claim 1, characterized in that: Both the screw mounting tube (45) and the insertion hole (21) are designed in the shape of a frustum cone. The diameter of the screw mounting tube (45) gradually decreases from the end near the bottom of the injection molded part body (4) to the end away from the injection molded part body (4). The inner diameter of the insertion hole (21) gradually decreases from the end near the cement pad (2) entering the mounting groove (44) to the end away from the mounting groove (44).

4. The connecting fastener between a steel truss and a formwork according to claim 1, characterized in that: The outer side wall of the screw mounting tube (45) away from the injection molded part body (4) is designed with an R0.5 round chamfer, and the inner side wall of the screw mounting tube (45) away from the injection molded part body (4) is designed with an R2 round chamfer.

5. A connecting fastener between a steel truss and a formwork according to claim 1, characterized in that: The injection molding body (4) has several uniformly distributed injection holes (47) between the strip hole positioning block (41) and the badminton ball hole positioning block (42), and a reinforcing plate (48) is fixedly installed on one side of the badminton ball hole positioning block (42) on the injection molding body (4).

6. The connecting fastener between a steel truss and a formwork according to claim 1, characterized in that: The injection molded part body (4) has symmetrically distributed weight-reducing grooves (49) on the outer walls of both ends of the strip hole positioning block (41) and the badminton ball-shaped hole positioning block (42).

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