CN205478763U - It is embedded from merit silk expansion bolts - Google Patents

Abstract

The utility model provides an it is embedded from merit silk expansion bolts relates to the mechanical engineering field. An it is embedded from merit silk expansion bolts comprises integral type button head internal thread expansion bolts and embedded the nail from merit silk wedge. Integral type button head internal thread expansion bolts's circular head can guarantee that anti rust coating thickness is even when the spraying anti -corrosive paint, and embedded do not have the exterior structure after the complete screw in expansion bolts of merit silk wedge nail makes the construction, effectively reduced the possibility that it is embedded from merit silk expansion bolts is corroded, has lengthened life, has improved the engineering quality, adopts embeddedly from merit silk wedge nail, and expansion bolts and the extrusion force of holing between the inner wall are easily controlled to the engineering quality has been guaranteed.

Description

A built-in self-working wire expansion bolt

technical field

The utility model relates to the field of mechanical engineering.

Background technique

The reinforcement of engineering structures such as bridges and building buildings in my country mostly adopts technologies such as the method of sticking steel plates. As shown in Figure 1, in order to ensure that the existing reinforced concrete and the steel plate participate in the stress together, in addition to the structural glue between the reinforced concrete interface and the reinforced steel plate, expansion bolts need to be set at a certain distance to prevent the reinforced steel plate, structural glue and the existing There is shear failure between the reinforced concrete and the three.

The structure of the expansion bolt adopted by the current common technology is shown in Fig. 2 . This type of expansion bolt has the following problems in practical engineering applications: 1. When the screw nut is manually tightened, it is difficult to ensure the uniformity of the screw tension; 2. When spraying anti-rust paint, the thickness of the anti-rust coating layer at the corners of the hex nut is difficult to reach the design The technical requirements stipulated in the construction technical standards; 3. The redundant screw rod not only hinders the appearance, but also the decoration of the screw rod will lead to technical problems such as the reduction of labor quality and service life. The screw rod is often the first structure to be corroded.

Contents of the invention

In order to solve the above technical problems, the utility model provides a built-in self-working wire expansion bolt. The embedded self-working wire expansion bolt is composed of an integrated round head internal thread expansion bolt and an embedded self-working wire wedge nail;

The one-piece round head internal thread expansion bolt has four hollow structures with different diameters. On the premise of the total length L, it is divided into round head length L1, internal thread cavity length L2, wedge length L3, and expansion structure length L4;

The outer diameter of the round head of the one-piece round head internal thread expansion bolt is D1, and the inner diameter of the round head of the one-piece round head internal thread expansion bolt is D2;

The outer diameter of the inner thread cavity of the integrated round head internal thread expansion bolt is D3, and the inner diameter of the inner thread cavity of the integral round head internal thread expansion bolt is D4;

The cross section of the expansion structure of the one-piece round head internal thread expansion bolt is a four-petal circular structure, which can be stretched by wedges. The outer diameter of the four-petal circular structure is D3. The inner diameter of the petal-shaped circular structure is D5;

The diameter of the dome of the embedded self-working wire wedge nail is D2, which fits the diameter of the inner hole of the round head of the integrated round head internal thread expansion bolt D2;

The dome of the embedded self-working wire wedge nail has a cross groove structure;

By adjusting the length of the embedded self-working wire wedge nail, the extrusion force between a built-in self-working wire expansion bolt and the inner wall of the borehole is controlled.

Beneficial effect

The round head of the one-piece round head internal thread expansion bolt can ensure that the thickness of the antirust coating is uniform when spraying the antirust paint. Eliminates the possibility of corrosion of the built-in self-working wire expansion bolts, prolongs the service life, and improves the project quality. With the use of built-in self-working wire wedge nails, the extrusion force between the expansion bolts and the inner wall of the borehole is easy to control. Thus ensuring the quality of the project.

Description of drawings

Figure 1 is a structural diagram of pasted steel plate reinforcement;

Fig. 2 is the structural diagram of the expansion bolt adopted by the shared technology;

Fig. 3 is the structural diagram of the built-in self-working wire expansion bolt of the present utility model;

Fig. 4 is the structural diagram of the embedded self-working wire wedge nail of the present utility model;

Example in Figure 1: 5 expansion bolts, 6 reinforced steel plates, 7 structural adhesives, 8 reinforced concrete structures;

Example in Figure 2: 1 screw, 2 nuts, 3 washers, 4 sleeves;

Figure 3 Example: A One-piece round head internal thread expansion bolt, B Embedded self-working wire wedge nail, J1 position J1 cross-sectional view,

J2 position J2 sectional view, J3 position J3 sectional view.

detailed description

A kind of built-in self-working wire expansion bolt of the present utility model is described in detail in conjunction with Fig. 3. It is composed of an integrated round head internal thread expansion bolt A and a built-in self-working wire wedge nail B;

The integral round head internal thread expansion bolt A has four hollow structures with different diameters. On the premise of the total length L, it is divided into round head length L1, internal thread cavity length L2, wedge length L3, and expansion structure length L4;

The outer diameter of the round head of the one-piece round head internal thread expansion bolt A is D1, and the round head inner hole diameter of the one-piece round head internal thread expansion bolt A is D2;

The outer diameter of the internal thread cavity of the one-piece round head internal thread expansion bolt A is D3, and the internal diameter of the internal thread cavity of the one-piece round head internal thread expansion bolt A is D4;

The cross section of the expansion structure of the one-piece round head internal thread expansion bolt A is a four-lobed circular structure, which can be expanded by wedges. The outer diameter of the four-petal circular structure is D3. The inner diameter of the four-lobed circular structure is D5;

The diameter of the dome of the built-in self-working wire wedge nail B is D2, which matches the diameter of the inner hole of the round head of the integrated round head internal thread expansion bolt A D2;

The dome of the embedded self-working wire wedge nail B has a cross groove structure;

By adjusting the length of the embedded self-working wire wedge nail B, the extrusion force between a built-in self-working wire expansion bolt and the inner wall of the borehole is controlled.

As an example, the steps to use an embedded self-working wire expansion bolt are as follows:

1) Drilling (drilling diameter = D + 2mm);

2) Use a vacuum cleaner or other device to clean up the dust and other impurities remaining in the hole;

3) First insert the integrated round head internal thread expansion bolt A into the drilled hole, and then insert the embedded self-working wire wedge nail B;

4) Use a screw gun to screw in the embedded self-working wire wedge nail B until the embedded wedge nail is completely embedded in the cap of the integrated round head internal thread expansion bolt A.

Claims (1)

1. An embedded self-working wire expansion bolt is characterized in that a kind of embedded self-working wire expansion bolt is made up of an integral round head internal thread expansion bolt and an embedded self-working wire wedge nail; The one-piece round head internal thread expansion bolt has four hollow structures with different diameters. On the premise of the total length L, it is divided into round head length L1, internal thread cavity length L2, wedge length L3, and expansion structure length L4; The outer diameter of the round head of the one-piece round head internal thread expansion bolt is D1, and the inner diameter of the round head of the one-piece round head internal thread expansion bolt is D2; The outer diameter of the inner thread cavity of the integrated round head internal thread expansion bolt is D3, and the inner diameter of the inner thread cavity of the integral round head internal thread expansion bolt is D4; The cross section of the expansion structure of the one-piece round head internal thread expansion bolt is a four-petal circular structure, which can be stretched by wedges. The outer diameter of the four-petal circular structure is D3. The inner diameter of the petal-shaped circular structure is D5; The diameter of the dome of the embedded self-working wire wedge nail is D2, which fits the diameter of the inner hole of the round head of the integrated round head internal thread expansion bolt D2; The dome of the embedded self-working wire wedge nail has a cross groove structure; By adjusting the length of the embedded self-working wire wedge nail, the extrusion force between a built-in self-working wire expansion bolt and the inner wall of the borehole is controlled.