Anti-pulling and non-shearing connecting structure of steel bar truss floor support plate without dismantling bottom die

Abstract

The utility model discloses an anti-pulling and non-shearing connecting structure of a disassembly-free bottom die steel bar truss floor support plate, which comprises a disassembly-free template and a steel bar truss arranged on one side of the disassembly-free template, and further comprises a connecting piece, the connecting piece is respectively connected with the steel bar truss and the disassembly-free template, the connecting piece is rigidly connected with the steel bar truss, and the connecting piece is connected with the disassembly-free template. The connecting piece is flexibly connected with the non-dismantling formwork in the direction parallel to the plane where the non-dismantling formwork is located, and is rigidly connected with the non-dismantling formwork in the direction not parallel to the plane where the non-dismantling formwork is located. According to the utility model, the disassembly-free bottom die can be effectively prevented from cracking under the action of horizontal shearing force, and the durability is improved.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a pull-out resistant but not shear resistant connection structure for steel truss floor decking that does not require dismantling of bottom formwork. Background Technology

[0002] Currently, with the accelerated pace of industrialization in construction, reinforced concrete truss floor decks are widely used in the construction industry. Existing non-removable formwork reinforced concrete truss floor deck technology mainly employs a reverse screw fastening process, where the finished formwork and the reinforced concrete truss are fastened together as a whole using connectors. However, the welding stress generated during processing easily causes horizontal shear forces on the formwork. Furthermore, after the upper concrete is poured, the floor deck is subjected to further shear forces, resulting in horizontal stress concentration at the screw locations. This makes it easy for micro-cracks to develop at these points. The finished formwork is typically made of cement fiberboard or silicate board, materials with significant wet-dry-shrink and thermal expansion-contraction effects. Under the influence of humidity and temperature, these micro-cracks can easily propagate into larger cracks. Utility Model Content

[0003] To address the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a pull-out resistant but not shear resistant connection structure for steel truss floor decking without the need for dismantling the bottom formwork, which solves the problem that the existing technology of rigid connection between the bottom formwork and the steel truss through connectors is prone to cracking due to horizontal shear force.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A pull-out but not shear-resistant connection structure for a steel truss floor deck that does not require the removal of the bottom formwork includes a formwork that does not require removal and a steel truss disposed on one side of the formwork. It also includes connectors that are connected to the steel truss and the formwork respectively. The connectors are rigidly connected to the steel truss, flexibly connected to the formwork in a direction parallel to the plane of the formwork, and rigidly connected in a direction not parallel to the plane of the formwork.

[0006] As an optimization, the connector includes a connecting support and a self-tapping screw that penetrates the template. One end of the head of the self-tapping screw is connected to the side of the template away from the steel truss, and the tail end penetrates the template and is fastened to the connecting support. The connecting support is then connected to the steel truss. An elastic sleeve is fitted on the portion of the self-tapping screw corresponding to the thickness of the template.

[0007] As an optimization, the diameter of the self-tapping screw head is larger than the outer diameter of the elastic sleeve, so that the screw head can be fastened to the side of the formwork away from the steel truss.

[0008] As an optimization, the elastic sleeve is a rubber sleeve or a plastic sleeve.

[0009] As an optimization, countersunk holes are provided in the formwork that does not need to be removed. The tail end of the self-tapping screw passes through the countersunk hole and is connected to the steel truss, so that the side of the screw head facing away from the tail end is not higher than the side of the formwork facing away from the steel truss.

[0010] As an optimization, the connecting support is made of steel, plastic or steel-plastic composite, and has a certain height so that the distance between the steel truss and the formwork that can be removed meets the requirements of the floor slab protective layer thickness.

[0011] Compared with the prior art, this application has the following advantages:

[0012] This utility model,

[0013] 1. It can reduce the technical requirements for production and allow for more lenient tolerances.

[0014] 2. The screw sleeve allows the screw to make flexible contact with the bottom mold in the horizontal direction, eliminating stress concentration under horizontal shear force and preventing cracks from appearing in the bottom mold.

[0015] 3. It avoids the need for special anti-crack treatment of the bottom formwork at the screw location later, reduces the number of surface layer construction measures, and lowers decoration costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the present invention;

[0018] In the diagram, 1 is the formwork that does not need to be removed, 2 is the steel truss, 3 is the self-tapping screw, 4 is the elastic sleeve, and 5 is the connecting support. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] In practice:

[0021] See the example. Figures 1-2 To address the problems existing in the prior art, this utility model provides a pull-out but not shear-resistant connection structure for a steel truss floor deck that does not require dismantling of the bottom formwork. It includes a formwork 1 that does not require dismantling and a steel truss 2 disposed on one side of the formwork 1. A connector is provided between the formwork 1 and the steel truss 2. The connector is connected to both the steel truss 2 and the formwork 1. The connector is rigidly connected to the steel truss 2, flexibly connected to the formwork 1 in a direction parallel to the plane of the formwork 1, and rigidly connected in a direction not parallel to the plane of the formwork 1.

[0022] Specifically, the connector includes a connecting support 5 and a self-tapping screw 3 that penetrates the formwork 1. One end of the head of the self-tapping screw 3 is connected to the side of the formwork 1 away from the steel truss 2, and the other end penetrates the formwork 1 and is fastened to the connecting support 5. The connecting support 5 is then connected to the steel truss 2. An elastic sleeve 4 is fitted onto the portion of the self-tapping screw 3 corresponding to the thickness of the formwork 1, i.e., the elastic sleeve 4 is fitted onto the contact area between the self-tapping screw 3 and the formwork 1. The diameter of the head of the self-tapping screw 3 is larger than the outer diameter of the elastic sleeve 4, allowing the head of the self-tapping screw 3 to be fastened to the side of the formwork 1 away from the steel truss 2. The elastic sleeve 4 is a rubber sleeve or a plastic sleeve. The connecting support 5 is a steel component, a plastic component, or a steel-plastic composite component. The connecting support 5 has a certain height, creating a gap between the steel truss 2 and the formwork 1, and ensuring that this gap meets the requirements for the thickness of the floor slab protective layer.

[0023] A countersunk hole is pre-formed in the template 1, and the tail end of the self-tapping screw 3 passes through the countersunk hole and connects to the steel truss 2, so that the side of the screw head facing away from the tail end is not higher than the side of the template 1 facing away from the steel truss 2. In this way, the screw head of the self-tapping screw 3 can be embedded in the bottom plate, ensuring that the bottom is flat.

[0024] This ensures that no cracks appear after the house is renovated, avoids the formation of micro-cracks at the screw locations, and solves the problem of damage to the formwork 1 caused by local shear stress generated during processing and construction. This utility model enables the formwork 1 to form an integral structure with the upper steel truss 2 to bear vertical loads, while also preventing horizontal shear stress, thus effectively preventing crack formation and improving durability.

[0025] In summary, this utility model,

[0026] 1. It can reduce the technical requirements for production and allow for more lenient tolerances.

[0027] 2. The screw sleeve allows the screw to make flexible contact with the bottom mold in the horizontal direction, eliminating stress concentration under horizontal shear force and preventing cracks from appearing in the bottom mold.

[0028] 3. It avoids the need for special anti-crack treatment of the bottom formwork at the screw location later, reduces the number of surface layer construction measures, and lowers decoration costs.

[0029] Although embodiments of the present invention have been shown and described, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and basis of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Therefore, the embodiments of the present invention are merely illustrative examples and do not constitute a limitation on the present invention in any way.

Claims

1. A pull-out-resistant but not shear-resistant connection structure for a steel truss floor deck that requires no formwork removal, comprising a formwork that requires no formwork removal and a steel truss disposed on one side of the formwork, and further comprising connectors, characterized in that, The connectors are respectively connected to the steel truss and the formwork. The connectors are rigidly connected to the steel truss, flexibly connected to the formwork in a direction parallel to the plane of the formwork, and rigidly connected in a direction not parallel to the plane of the formwork.

2. The pull-out-resistant but not shear-resistant steel truss floor decking connection structure without formwork removal according to claim 1, characterized in that, The connector includes a connecting support and a self-tapping screw that penetrates the template. One end of the self-tapping screw is connected to the side of the template away from the steel truss, and the other end penetrates the template and is fastened to the connecting support. The connecting support is then connected to the steel truss. An elastic sleeve is fitted on the portion of the self-tapping screw corresponding to the thickness of the template.

3. The pull-out-resistant but not shear-resistant steel truss floor decking connection structure without formwork removal according to claim 2, characterized in that, The head diameter of the self-tapping screw is larger than the outer diameter of the elastic sleeve, so that the head of the self-tapping screw can be fastened to the side of the formwork away from the steel truss.

4. The pull-out-resistant but not shear-resistant connection structure of a steel truss floor deck without the need for formwork removal according to claim 2, characterized in that, The elastic sleeve is a rubber sleeve or a plastic sleeve.

5. The pull-out-resistant but not shear-resistant connection structure of a steel truss floor deck without the need for formwork removal according to claim 2, characterized in that, The template is provided with countersunk holes, and the tail end of the self-tapping screw passes through the countersunk hole and is connected to the steel truss, so that the side of the screw head facing away from the tail end is not higher than the side of the template facing away from the steel truss.

6. The pull-out-resistant but not shear-resistant connection structure of a steel truss floor deck without the need for formwork removal according to claim 2, characterized in that, The connecting support is made of steel, plastic, or a combination of steel and plastic. The connecting support has a certain height so that the distance between the steel truss and the formwork that can be removed meets the requirements for the thickness of the floor slab protective layer.

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