CN105804245A - Steel structure high-strength bolt friction type connection method based on particle anti-slip effect - Google Patents

Abstract

The invention discloses a steel structure high-strength bolt friction connection method based on particle anti-slip effect, which does not require special contact surface treatment process, and directly presses particles between steel plates connected by high-strength bolts and then tightens high-strength bolts to improve its resistance. slip coefficient. The particles are pressed between the two connecting plates as required: the particles can be deformed but not cracked when pressed into the plates, and there is no gap between the connecting plates. The particles need to satisfy specific mechanical and geometric properties, and be arranged around the bolt holes of the high-strength bolts in a specific manner. The invention does not have high requirements on the surface of the connected steel plate, directly presses the particles to form stable dents on the surface of the steel plate, uses the pre-tension force of high-strength bolts to tightly fix the particles in the pressed dents, and passes the connection between the particles and the dents. Clamping and mutual restriction prevent mutual slippage between the contact surfaces, significantly improve the anti-slip coefficient of the high-strength bolt connection contact surface, and effectively simplify the component surface treatment process.

Description

Friction-type connection method of high-strength bolts in steel structures based on particle anti-slip effect

technical field

The invention belongs to the field of civil engineering, and in particular relates to a high-strength bolt friction connection method for steel structures based on the anti-slip effect of particles.

Background technique

The anti-slip coefficient of the contact surface of high-strength bolts determines the friction of the connected plates. Therefore, when high-strength bolts are used, the contact surfaces of components are usually treated specially to make them clean and rough to improve their anti-slip coefficients. The contact surface treatment methods recommended by my country's current steel structure design codes include: sandblasting (shot), coating inorganic zinc-rich paint after sandblasting (shot), red rust after sandblasting (shot), wire brush to remove floating rust or no treatment . The mature surface treatment process can obtain an anti-slip coefficient of 0.3-0.5, but the panels need to be assembled immediately after sandblasting to prevent the surface from re-rusting; coating inorganic zinc-rich paint after sandblasting will reduce the anti-slip coefficient of the contact surface, which is suitable for For open-air structures such as bridge engineering rather than high-rise building steel structures; red rust after sandblasting needs to consider the influence of rusting time on the friction coefficient, and floating rust needs to be removed during installation, the process is complicated and the cycle is long. In addition, the installation of the contact surface in the case of wet or rain will seriously reduce the anti-slip coefficient, which must be strictly avoided during construction and the surface of the joint must be kept dry. Therefore, it is necessary to develop a new type of high-efficiency high-strength bolt friction connection.

Contents of the invention

The purpose of the present invention is to provide a high-efficiency high-strength bolt friction connection method with a high anti-slip coefficient for the above-mentioned deficiencies in the surface treatment process of the traditional high-strength bolt friction connection, which can: (1) Simplify the high-strength bolt friction connection (2) Significantly improve the anti-slip coefficient of high-strength bolt friction connection.

The technical solution adopted in the present invention is: a frictional connection method of high-strength bolts for steel structures based on the particle anti-slip effect, the method includes steel connecting plates, pressed particles and high-strength bolts;

The pressed-in particle material is made of alloy steel, the Rockwell hardness of the pressed-in particles reaches more than 3 times the Rockwell hardness of the steel connecting plate, and the strength is not less than 1.5 times that of the steel connecting plate, and the surface of the pressed-in particles is treated with anticorrosion;

The two steel connecting plates are connected together by high-strength bolts, and the contact surfaces of the two steel connecting plates are provided with pressed particles to form an anti-slip surface, and the pressed particles are arranged around the bolt holes on the steel connecting plates ;

No special contact surface treatment is required during the connection of the steel connecting plate parts, only the contact surface needs to be cleaned;

The press-in particles are pressed into the contact surface of two steel connecting plates through vertical load, forming obvious and stable dents on the anti-slip surface. There may be deformation but no cracks in the steel connecting plates, and the steel connecting plates There is no gap between compression;

The pressed particles are tightly fixed in the pressed dents, and the mutual slipping between the anti-slip surfaces is prevented through the clamping and mutual restriction of the pressed particles and the dents.

The invention does not require special contact surface treatment, directly presses particles between the steel plates connected by high-strength bolts and then tightens the high-strength bolts to increase its anti-slip coefficient. In the connection, the pressed particles should be pressed between the connecting plate and the connected plate as required. The particles can be deformed but not cracked when pressed into the plate, and there is no gap between the connecting plates. The specifications of the high-strength bolts, the specifications of the connecting steel plates, and the positions of the bolt holes meet the requirements of the current relevant specifications. The pressed particles are evenly distributed around the bolt holes, and the distance from the particles to the edge of the hole and the distance from the end plate must meet the structural requirements to ensure the tight fit between the steel plates. The specifications of the high-strength bolts, the specifications of the connecting steel plates, and the positions of the bolt holes meet the requirements of the current relevant specifications.

Preferably, the pressed-in particles are selected from high-strength steel materials consistent with high-strength bolts, and the surface of the pressed-in particles is treated with coating.

Preferably, the shape of the pressed particles should be uniform and symmetrical without edges and corners.

As a preference, the pressed-in particles are cylinders or spheres with a cross-sectional aspect ratio a/b ranging from 1 to 3 and arced surfaces; the thickness t of the steel connecting plate, the diameter of the bolt hole d, the pressed The particle size a and b are not greater than 1/2t and 1/2d; the minimum allowable distance from the center of the pressed particle to the edge of the bolt hole is 1.5a, the maximum allowable distance is 2d, and the minimum allowable distance from the center of the pressed particle to the edge of the steel connecting plate The distance is 1.5d.

As a preference, the pressed-in particles are evenly distributed around the bolt holes. Considering the arrangement of the bolt groups, the arrangement of the pressed-in particles should be parallel to the bolt holes, and the distance between the pressed-in particles and the edge of the bolt holes must meet the structural requirements to ensure snug fit.

The invention is not only applicable to ordinary steel structures, but also applicable to high-strength steel structures. By pressing particles with certain characteristics into the component contact surface to a certain depth, a stable "anchor effect" and "blind hole bolt effect" are formed on the contact surface, and then stable and sufficient anti-slip resistance is obtained, so as to meet the requirements of high-strength steel structures. The need for efficient transfer of shear forces in bolted connections. Regardless of the roughness of the steel contact surface, the particles are directly pressed in to form a stable dent on the anti-slip surface, and then the bolts are tightened to use the pre-tension force of the high-strength bolts to tightly fix the particles in the pressed dent. The clamping and mutual restriction of particles and dents prevents the mutual slippage between the contact surfaces. Through this new force transmission mechanism, the shear resistance of high-strength bolt connection is completed. By selecting the appropriate particle material and size, reasonable particle arrangement, including particle spacing, distribution form, etc., the anti-slip coefficient is greatly improved or even doubled compared with traditional high-strength bolts. At the same time, it only needs to be simple in production. It can effectively remove floating rust of components without considering the influence of surface rust on the surface of components after sandblasting against slip coefficient, which can meet the needs of high-strength bolted connections of steel structures under different conditions.

Compared with the prior art, the present invention has the following advantages:

1. Simplify the process of high-strength bolt friction connection and shorten the production cycle. The contact surface treatment methods recommended by my country's current steel structure design codes include: sandblasting (shot), coating inorganic zinc-rich paint after sandblasting (shot), red rust after sandblasting (shot), wire brush to remove floating rust or no treatment . The mature surface treatment process can obtain an anti-slip coefficient of 0.3-0.5, but the panels need to be assembled immediately after sandblasting to prevent the surface from re-rusting; coating inorganic zinc-rich paint after sandblasting will reduce the anti-slip coefficient of the contact surface, which is suitable for For open-air structures such as bridge engineering rather than high-rise building steel structures; red rust after sandblasting needs to consider the influence of rusting time on the friction coefficient, and floating rust needs to be removed during installation, the process is complicated and the cycle is long. The invention does not consider the roughness of the steel contact surface, but directly presses the particles to form stable dents on the anti-slip surface, and then tightens the bolts to use the pre-tension force of the high-strength bolts to tightly fix the particles in the pressed dents , Through the clamping and mutual restriction of particles and dents, the mutual slippage between the contact surfaces is prevented. Through this new force transmission mechanism, the shear resistance of high-strength bolt connections is completed, which is convenient and efficient to manufacture.

2. Significantly improve the anti-slip coefficient of high-strength bolt friction connection. By selecting the appropriate particle material and size, and carrying out reasonable particle arrangement, including particle spacing, distribution form, etc., the anti-slip coefficient is greatly improved or even doubled compared with traditional high-strength bolts, which can improve the design of high-strength bolt connections. Reliability, meeting the needs of high-strength bolted connections of steel structures under different conditions.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of an arrangement of pressed particles of the present invention;

Fig. 3 is a schematic diagram of the shape of a pressed particle of the present invention;

FIG. 4 is a sectional view of FIG. 3 .

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1-4: a high-strength bolt friction connection based on particle anti-slip effect, including steel connecting plate 1, high-strength bolt 2, pressed particles 3, and bolt hole 4.

Fig. 1 is a structural schematic diagram of a high-strength bolt friction connection of a steel structure based on the anti-slip effect of particles in the present invention. The material of the pressed particles 3 is alloy steel, and the Rockwell hardness of the pressed particles reaches the Rockwell hardness of the steel connecting plate. The strength is not less than 1.5 times that of the steel connecting plate, and the surface of the pressed particle 3 has undergone anti-corrosion treatment; the two steel connecting plates 1 are connected together by high-strength bolts 2, and the two steel connecting plates 1 Press-in particles 3 are provided between the contact surfaces to form an anti-slip surface, and the press-in particles 3 are arranged around the bolt holes 4 on the steel connecting plate 1;

The connection of the steel connecting plate 1 does not require special contact surface treatment, only the contact surface needs to be cleaned;

The pressed particles 3 are pressed into the contact surface of two steel connecting plates 1 by a vertical load, forming obvious and stable dents on the anti-slip surface. There may be deformation in the steel connecting plate 1 but no cracks. There is no gap between the connecting plates 1; after the high-strength bolt 2 is tightened and checked and accepted, the joints of the connecting plates should be closed with putty in time, and painted to prevent rust according to the design requirements.

The indented particles 3 are firmly fixed in the pressed dents, and the mutual slip between the anti-slip surfaces is prevented through the clamping and mutual restriction of the indented particles 3 and the indents.

FIG. 2 is a schematic diagram of an arrangement of pressed particles according to the present invention. The pressed particles 3 are evenly distributed around the bolt holes 4 and are parallel to the bolt holes 4 .

Figures 3 and 4 are schematic diagrams of the shape of a pressed particle according to the present invention. The shape of the pressed particle 3 should be uniform and symmetrical without edges and corners, and the cross-sectional aspect ratio a/b ranges from 1 to 3. It is a cylinder with an arc surface. body.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, within the scope of the principles and technical ideas of the present invention, various changes, modifications, replacements and deformations to these implementations still fall within the protection scope of the present invention.

Claims (6)

1. the steel structure high strength bolt friction-type connection method based on granule resistant slide effect, it is characterised in that: the method includes steel attaching plate elements, press-in granule and high-strength bolt；

Described press-in granular materials adopts steel alloy, and press-in granule Rockwell hardness reaches more than 3 times of steel attaching plate elements Rockwell hardness, and intensity is not less than 1.5 times of steel attaching plate elements, and press-in particle surface is through preservative treatment；

Two pieces of described steel attaching plate elements are linked together by high-strength bolt, be provided with press-in granule and form resistant slide face between the contact surface of two pieces of steel attaching plate elements, and press-in granule is arranged around the bolt hole in steel attaching plate elements；

Described steel attaching plate elements connects does not need special contact surface to process when making, and only need to clean contact surface；

Described press-in granule, by the contact surface of vertical load two pieces of steel attaching plate elements of press-in, forms obvious, stable indenture in resistant slide face, can have deformation but can not have crackle in steel attaching plate elements, and compressing between steel attaching plate elements does not have gap；

Described press-in granule is tightly secured in the indenture extruded, and by being pressed into granule and the clamping of indenture and restriction mutually, stops the mutual sliding between resistant slide face.

2. the steel structure high strength bolt friction-type connection method based on granule resistant slide effect according to claim 1, it is characterised in that: described press-in granule selects the high-strength steel consistent with high-strength bolt.

3. the steel structure high strength bolt friction-type connection method based on granule resistant slide effect according to claim 1, it is characterised in that: described press-in particle surface processes through coating.

4. the steel structure high strength bolt friction-type connection method based on granule resistant slide effect according to claim 1, it is characterised in that: described press-in grain shape should not have corner angle symmetrically.

5. the steel structure high strength bolt friction-type connection method based on granule resistant slide effect according to claim 1, it is characterised in that: described press-in granule selects the sectional aspect ratio a/b scope cylinder between 1 and 3, with cambered surface or spheroid；Described steel attaching plate elements thickness t, diameter of bolt hole d, described press-in particle size a, b are not more than 1/2t, 1/2d；Press-in granular center is 1.5a, maximum permissible distances 2d to bolt hole limit allowable minimum distance, and press-in granular center is 1.5d to the allowable minimum distance at steel attaching plate elements edge.

6. the steel structure high strength bolt friction-type connection method based on granule resistant slide effect according to claim 1, it is characterised in that: described press-in granule is arranged in bolt hole and is distributed evenly around, and press-in granule arrangement mode should be parallel with bolt hole.