Anti-pulling and anti-shearing integrated self-locking shear nail connector

Abstract

The application discloses an anti-pulling and anti-shearing integrated self-locking shear nail connector, which comprises a bolt nail, a self-locking nail body protection ring and a self-locking nail cap protection ring are respectively arranged on the nail body and the top cap of the bolt nail, one hollow protection ring is arranged on the self-locking nail body protection ring in an upper and lower mode, the two protection rings are both at an angle of 45 degrees with the nail body of the bolt nail, an opening area is arranged on the side wall of the self-locking nail body protection ring, and clamping edges are arranged on the two sides of the opening area. The self-locking nail body protection ring and the self-locking nail cap protection ring are added on the basis of the traditional bolt nail, deformation cavity areas are formed around the nail body and the nail cap at the same time, the cavity area is formed between the bolt nail and the floor after the hardening of the concrete floor, and small-range horizontal dislocation between the floor and the bolt nail is realized. The local release of the negative bending moment section realizes the cooperation of the steel beam and the concrete floor, and effectively relieves the cracking problem of the concrete floor.

Description

Technical Field

[0001] This invention relates to the field of building steel structure technology, specifically to an integrated self-locking shear stud connector that is resistant to pull-out but not to shear. Background Technology

[0002] In the field of civil construction, large-span steel floor slabs are widely used, especially in projects such as high-speed railway stations, convention centers, and airport terminals. Large-span composite beams often exhibit significant negative bending moments at their ends. Due to the conventional shear studs, the concrete slab and steel beam share the load and deformation, resulting in strong restraint on the concrete's shear and pull-out resistance. This makes the concrete flanges in the negative bending moment area prone to cracking. Flange cracking affects both structural stiffness and durability. Flange cracking also easily leads to cracking of the decorative surface layer, thus affecting aesthetics.

[0003] The current general specifications for composite structures clearly require that concrete slabs in the negative bending moment zone of steel-concrete composite beams should be protected against concrete cracking by measures such as pull-out but not shear connections that partially release the composite effect.

[0004] Pull-out non-shear studs are mainly used in bridge construction, with few applications in civil engineering. Currently, the pull-out non-shear studs used in bridges are mainly split shear studs, which are more expensive, have more complex construction procedures, and are prone to quality problems during concrete pouring. Summary of the Invention

[0005] To address the technical problems existing in the prior art, this invention provides an integrated self-locking shear stud connector that is resistant to pull-out but not shear. This connector is easy to process and install, requires no changes to the traditional stud form, and is less prone to deformation and other quality issues during concrete pouring. After the concrete slab hardens, a cavity is formed between the stud and the slab, allowing for small-scale horizontal misalignment between the slab and the stud. This enables localized release of negative bending moment in the combined action of the steel beam and the concrete slab, effectively mitigating concrete slab cracking.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a pull-out resistant but not shear resistant integrated self-locking shear stud connector, comprising a stud, a self-locking stud body protective ring and a self-locking stud head protective ring respectively sleeved on the stud body and stud head, wherein the self-locking stud body protective ring is provided with a hollow upper protective ring and a hollow lower protective ring respectively, the upper edge of the upper protective ring and the lower edge of the lower protective ring are both at a 45° angle to the stud body, and the side wall of the self-locking stud body protective ring is provided with an opening area and interlocking edges are provided on both sides.

[0007] The upper edge of the upper protective ring and the lower edge of the lower protective ring are both at a 45° angle to the stud body, achieving a spring effect. This allows the self-locking stud body protective ring to compress and deform during installation, achieving a reverse-locking fixation on the side wall. Simultaneously, the hardness of the self-locking stud body protective ring ensures that it will not compress and deform during concrete pouring. It also ensures a tight seal between the self-locking stud body protective ring and the stud body, preventing concrete from flowing into the cavity area during pouring. The side wall of the self-locking stud body protective ring has an opening area, and the two sides are connected by interlocking edges. During installation, appropriate inward retraction achieves interlocking.

[0008] Furthermore, the self-locking nail body protective ring has a wall thickness of 0.8-1.2mm and is formed by rolling thin steel sheets or galvanized steel plates.

[0009] Furthermore, the diameter of the hollow area inside the self-locking nail body protective ring is equal to the diameter of the stud body, and the diameter is available in two specifications: ø16mm and ø19mm. The hardness of the hollow area must be sufficient to prevent compressive deformation during concrete pouring. The hollow area is divided into two types according to the stud specification: when the stud specification is ø16mm, the thickness of the hollow area is 8mm; when the stud specification is ø19mm, the thickness of the hollow area is 10mm.

[0010] Furthermore, the height H1 of the self-locking nail body protection ring is the height H-5mm of the stud nail body.

[0011] Furthermore, the self-locking nail head protective ring is made of plastic and is ring-shaped.

[0012] Furthermore, the self-locking nail head protective ring is provided with an upper locking plate and a lower locking plate, and the inner ring diameter is the diameter of the stud nail head + 5mm. The width of the upper locking plate and the lower locking plate is 15mm. During installation, when the self-locking nail head protective ring is directly put onto the stud nail head, the lower locking plate deforms. After being put on, the lower locking plate rebounds and locks the stud nail head in place.

[0013] The present invention has the following beneficial effects:

[0014] (1) Based on traditional studs, this invention adds a self-locking stud body protection ring and a self-locking stud head protection ring to simultaneously form a deformation cavity area around the stud body and stud head, which can realize the combined effect of the steel beam and concrete floor slab in the negative bending moment section, effectively alleviating the cracking problem of concrete floor slab. Traditional reinforcement measures often control the crack width by increasing the density of steel bars.

[0015] (2) The self-locking nail body protection ring is machined in the factory, which is quick and reliable; the self-locking nail head protection ring can be directly customized and purchased, which is quick, convenient and economical.

[0016] (3) The present invention is easy to install on site and can shorten the construction cycle. The stud still adopts the traditional form and installation method. After the stud is completed, a self-locking stud body protection ring is installed on the stud body, and the stud head can be directly put into the self-locking stud head protection ring. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the connector of the present invention;

[0018] Figure 2 This is a side view of the connector of the present invention;

[0019] Figure 3 This is an exploded view of the components of the connector of the present invention;

[0020] Figure 4 This is a schematic diagram of the connector assembly of the present invention.

[0021] Labeling instructions: 1. Stud; 2. Self-locking stud body protection ring; 3. Self-locking stud head protection ring; 4. Upper protection ring; 5. Lower protection ring; 6. Lower retaining plate; 7. Cavity area; 8. Upper retaining plate; 9. Engaging edge. Detailed Implementation

[0022] Reference Figures 1 to 4 The following is a further description of a specific embodiment of the pull-out resistant but not shear resistant integrated self-locking shear stud connector of the present invention.

[0023] like Figure 1 As shown; a shear-release integrated self-locking stud connector includes a thin-walled metal self-locking stud body protection ring 2, a plastic self-locking stud head protection ring 3, a stud body, and a stud head.

[0024] (1) Factory processing:

[0025] The self-locking nail body protection ring 2 has a wall thickness of 0.8-1.2mm and is made of thin steel sheet or galvanized steel plate. Through rolling and forming, the self-locking nail body protection ring is provided with a hollow upper protection ring 4 and a hollow lower protection ring 5, respectively. The upper edge of the upper protection ring 4 and the lower edge of the lower protection ring 5 are both at a 45° angle to the nail body.

[0026] A spring effect is achieved, allowing the self-locking nail body protective ring to compress and deform during installation, thus securing the sidewalls with a reverse fastening mechanism. Simultaneously, the hardness of the self-locking nail body protective ring ensures that it does not compress or deform during concrete pouring. The diameter of the hollow area inside the self-locking nail body protective ring is equal to the diameter B of the stud. Diameter B is available in two specifications: ø16mm and ø19mm. When the stud specification is ø16mm, the cavity thickness A is 8mm; when the stud specification is ø19mm, the cavity thickness A is 10mm. The height H1 of the self-locking nail body protective ring is the stud height H - 5mm. The self-locking nail body protective ring 2 has an opening on its side wall, with interlocking edges 9 on both sides. During installation, appropriate inward retraction achieves interlocking.

[0027] The self-locking nail head protection ring 3 is made of plastic and is ring-shaped. The hardness of the cavity area 7 must be sufficient to prevent compressive deformation during concrete pouring. The cavity area 7 is divided into two types according to the stud specifications: when the stud specification is ø16mm, the cavity thickness is 8mm; when the stud specification is ø19mm, the cavity thickness is 10mm. The self-locking nail head protection ring is equipped with an upper retaining plate 8 and a lower retaining plate 6. The width of both the upper retaining plate 8 and the lower retaining plate 6 is 15mm, and the inner ring diameter is the stud head diameter + 5mm. During installation, the lower retaining plate 6 deforms when the self-locking nail head protection ring 3 is directly slipped onto the stud head. After slipping, the lower retaining plate 6 rebounds and locks the nail head in place.

[0028] On-site construction:

[0029] After installing stud 1, remove the ceramic ring, pry open the open side of the self-locking stud body protection ring 2, and slide the self-locking stud body protection ring 2 onto the stud from the side. Appropriately compress the diameter of the self-locking stud body protection ring to make the open side snap back and secure it. Then, slide the self-locking stud head protection ring 3 onto the stud head. During the insertion of the lower retaining plate 6, there may be some rebound, which will lock the stud head in place.

[0030] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A pull-out resistant but not shear resistant integrated self-locking shear stud connector, characterized in that: The device includes a stud, with a self-locking stud body protective ring and a self-locking stud head protective ring respectively fitted over the stud body and stud head. The self-locking stud body protective ring has a hollow upper protective ring and a hollow lower protective ring, with the upper edge of the upper protective ring and the lower edge of the lower protective ring both forming a 45° angle with the stud body to achieve a spring effect. This allows the self-locking stud body protective ring to be compressed and deformed during installation to achieve side wall reverse fastening. The side wall of the self-locking stud body protective ring has an opening area and interlocking edges on both sides. The self-locking nail body protective ring has a wall thickness of 0.8-1.2mm and is formed by rolling thin steel sheets or galvanized steel plates. The diameter of the hollow area inside the self-locking nail body protection ring is equal to the diameter of the stud nail body; The self-locking nail head protective ring is made of plastic and is ring-shaped. The self-locking nail head protection ring is provided with an upper clamping plate and a lower clamping plate. The inner ring diameter is the diameter of the stud nail head + 5mm. The width of the upper clamping plate and the lower clamping plate is 15mm. During installation, the lower clamping plate deforms when the self-locking nail head protection ring is directly put into the stud nail head. After being put into place, the lower clamping plate rebounds and locks the nail head in place.

2. The pull-out resistant but not shear resistant integrated self-locking shear stud connector according to claim 1, characterized in that: The height H1 of the self-locking nail body protection ring is equal to the height H-5mm of the stud nail body.

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