JP2667436B2 - High strength bolt friction joint structure of stainless steel structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a structure mainly at a joint portion of a structural frame of a building or the like, and a joining member made of stainless steel joined to each other. The present invention relates to a force bolt friction joint structure.

[Prior art] As a joining method performed in the field of a structural frame for a building or the like, in particular, an in-situ joining method, a rivet joining method, a high-strength bolt having a strength two to three times that of a normal bolt is used. Welding methods such as high-strength bolt friction welding and arc welding have been used, but recently, high-strength bolt friction welding has been adopted because it has excellent on-site workability and high rigidity. It has become mainstream.

This high-strength bolt friction welding method uses a high-strength bolt to strongly press a plurality of superimposed joining members from both sides thereof, and the frictional force generated between the joining surfaces of the joining members causes slippage between the joining members. This is a shearing type joining method that generates a resistance force, that is, a slip resistance, and transmits the stress in a direction perpendicular to the bolt axis using the slip resistance.

Therefore, in this high-strength bolt friction welding method, it is necessary to increase the slip coefficient between the joining surfaces of the joining members in order to improve the joining strength. Surface treatment such as removing black skin by blasting, sand blasting, grid blasting, removing black skin with a desk grinder, sander grinder, etc., applying inorganic zinc paint, etc. Attempts have been made to improve the surface slip coefficient.

By the way, in recent years, attention has been paid to the high corrosion resistance and designability of stainless steel even in the field of structural frames for buildings, and the idea of using this stainless steel for building structures has begun, and part of it has been attempted. Has also begun.

However, the use of this stainless steel as an architectural structure is still uncommon, and there are cases where the stainless steel bolt is used in a bearing shearing type, but the distance between the shaft of the high-strength bolt and the hole is high. It is not realistic because it is necessary to improve the hole accuracy to a value close to zero, and
Since the transmission force of the joint is not very effective, it is difficult to apply it to structures other than very light structures. In practice, it has a slip coefficient of 0.45 as specified in Article 92-2 of the Enforcement Order of the Building Standards Act. The actual situation is that an appropriate and efficient joining method that can achieve a joint structure satisfying the above values has not been developed.

By the way, in this high-strength bolt friction joining method using stainless steel, it is conceivable to apply the above-described method of improving the slip coefficient of the joining surface of each joining member. However, according to our experiments, the method of removing black scale using shot blasting, sand blasting, grit blasting, or the like, cannot make the slip coefficient 0.45 or more. Further, the method of removing rust by using a desk grinder, a sander grinder, or the like to cause rust is, of course, not applicable to this stainless steel joining member.

[Problems to be Solved by the Invention] Accordingly, an object of the present invention is to provide a joint structure having high stiffness without rusting by using stainless steel as a joining member in high strength bolt friction joining. Is to do.

Another object of the present invention is to provide a joint structure in which a high-strength bolt friction joint structure of a stainless steel structure can ensure a slip coefficient of a joint surface of 0.45 or more without impairing the corrosion resistance of stainless steel. It is in.

[Means for Solving the Problems] That is, the present invention is a high-strength bolt friction joint structure in which a plurality of stainless steel joining members are friction-joined to each other using high-strength bolts. It is a high-strength bolt friction joint structure of a stainless steel structure in which a coating layer containing stainless steel powder is interposed between the surfaces.

In the present invention, as the stainless steel that can be used as the joining member forming the friction joint structure, for example, SU
Steel types such as S304, SUS430, and SUS316 can be mentioned. The joining members to be joined to each other may be of different steel types, but are preferably of the same steel type.

Also, as for the stainless steel powder in the coating layer interposed between the joining surfaces of the joining members to be joined to each other, similarly to the case of the above joining members, SUS304, SUS430, steel types such as SUS316 can be mentioned. Although it may be a steel type different from the stainless steel constituting the joining member, it is preferable to use the same steel type from the viewpoint of corrosion resistance. And about the average particle size of this stainless steel powder, usually 0.1 ~ 50μ
m, preferably 1 to 15 μm, and if it is less than 0.1 μm, it is difficult to achieve a sufficient slip coefficient, that is, 0.45 or more as a target.On the contrary, if it exceeds 50 μm, rolling of particles occurs between bonding surfaces. There is a risk that loosening may occur.

The method of interposing the coating layer containing the stainless steel powder between the joining surfaces of the joining members may be any method as long as it is interposed so as not to easily fall off. However, preferably, a coating material containing a stainless powder as a pigment is applied to one or both of the joining surfaces of the joining members to be joined to each other, and dried to form a coating layer containing the stainless powder. When forming the coating layer, it is preferable to perform a blasting process such as shot blasting or grid blasting or a surface roughening process using, for example, a disk sander of about # 36 on the joining surface side of the joining member. In the case of a surface roughening treatment using a disk sander, it is desirable that the uneven streaks to be formed are formed in a direction perpendicular to the tensile direction acting between the joined joining members.

Further, as a coating material for forming a coating layer containing the stainless steel powder, preferably, water of a polymer compound having a Si-O bond or Ti-O bond in the molecule, an organic solvent such as alcohol or the like. It is preferable that the solution or suspension of the mixed solvent of is used as a vehicle and that the stainless powder is contained as a pigment. Here, the Si-
As a polymer compound having an O bond or a Ti-O bond,
For example, one or a mixture of two or more of water glass, an alkyl silicate or a partial hydrolyzate thereof, an alkyl titanate or a partial hydrolyzate thereof, and the like can be given. The above-mentioned alkyl silicate and alkyl titanate are themselves monomers and not high molecular compounds, but when partially reacted with a small amount of water, partially hydrolyze and polymerize to form a high molecular compound. When the substance is used together with a solvent such as water or alcohol when used as a coating composition, it is considered that the polymer is substantially polymerized in the coating composition.

Regarding the composition of this paint, the vehicle is 5 to 50 parts by weight, preferably 15 to 30 parts by weight, in terms of solid content, based on 100 parts by weight of stainless steel powder. When the amount is more than 50 parts by weight, the solidified vehicle is vitreous, so that cracks are easily formed.

In addition to the above-mentioned stainless steel powder and vehicle, for example, a dispersant, a reactive diluent, an anti-settling agent, etc. which are added to ordinary paints in order to quickly cure a coating film having excellent uniformity. One or more of these can be added as needed. Further, as means for forming a coating film layer on each joining member using such a paint, conventionally known means such as brushing and spraying can be used.

Further, the thickness of the coating layer formed on the joint surface of the joint member is 20 to 200 μm after drying, preferably 50 to 100 μm.
μm is appropriate. If the film thickness is less than 20 μm, a sufficient slip coefficient cannot be obtained, while if it is more than 200 μm, the coating layer is easily crushed when a stress is applied, and a sufficient friction resistance cannot be obtained.

In order to obtain the frictional joint structure of the present invention, it is preferable to superimpose the respective joining members having the coating layer formed on the joining surface as described above, and use a high-strength bolt to separate the respective joining portions. What is necessary is just to tighten with a predetermined tightening force. In addition, as the high-strength bolt used at this time, a conventionally known bolt can be appropriately used, but if this high-strength bolt is used without painting, it is preferably made of stainless steel from the viewpoint of its corrosion resistance. It is preferable to use one made of stainless steel of the same steel type as each joining member or stainless powder. Also,
As a tightening method at this time, a conventionally known method such as a torque control method, a nut rotation method, or a method combining both of them can be adopted.

[Examples] Hereinafter, the present invention will be specifically described based on examples shown in the accompanying drawings.

FIGS. 1 and 2 show a high-strength bolt frictional joint structure of a building structure including a column 1 and a beam member 2 made of stainless steel (SUS304) according to an embodiment of the present invention. This high-strength bolt friction joint structure is, as shown in FIG. 2, a column 1 which constitutes one joint member connected to each other.
Side plate 3 made of stainless steel (SUS304) is attached to both side surfaces of the beam member 1a and the beam member 2 constituting the other joining member, and the pair of side plates 3 and the side plate 3 are provided between them. The sandwiched beam portion 1a or beam member 2 is formed by tightening a high-strength bolt 5a and a nut 5b via a washer 4.

In this example, 100 parts by weight of stainless steel powder (SUS304) having an average particle size of 8 μm was used as a vehicle at the joint surface of the beam portion 1a of the pillar 1, the beam member 2, and each side plate 3 to convert ethyl silicate as a solid content. Coating layers 6a and 6b (film thickness after drying: 50 μm) formed by applying and drying a dye obtained by blending 25 parts by weight are interposed.

Regarding the high-strength bolt friction joint structure of this example, "High-strength bolt joint, design and construction guideline" issued by Architectural Institute of Japan No. 54
As a result of measuring the slip coefficient according to the test method described on the page, it was found that the slip coefficient μ was 0.58 and the joint structure had high rigidity.

[Effect of the Invention] The high-strength bolt friction joint structure of the stainless steel structure of the present invention can secure a slip coefficient of 0.45 or more at the joint surface without impairing the corrosion resistance of stainless steel. It is rust-free and has excellent design and high rigidity, especially for large structures, buildings, equipment plants, bridges, highways, etc. in highly corrosive environments such as those requiring stainless steel and high temperature corrosive environments. Useful.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing a high-strength bolt friction joint structure of a building structure including columns and beam members according to an embodiment of the present invention, and FIG. 2 is a high-strength bolt friction joint structure of FIG. It is explanatory drawing which shows concretely. Description of reference numerals (1) ... pillar, (1a) ... beam part (joining member), (2) ... beam member (joining member), (3) ... side plate (joining member), (5a) ... High-strength bolt, (5b) …… High-strength bolt nut, (6a) (6b) …… Coating layer.

Claims (5)

(57) [Claims] A high-strength bolt friction joint structure in which a plurality of joining members made of stainless steel are friction-joined to each other by using high-strength bolts.
For 100 parts by weight of 0 μm stainless steel powder, Si-
A high-strength bolted friction joint structure of a stainless steel structure, wherein a coating layer having 5 to 50 parts by weight (in terms of solid content) of a polymer compound having an O bond or a Ti-O bond is interposed. 2. The coating layer is formed on either or both of the joint surfaces of the joint members to be joined to each other.
A high-strength bolt friction joint structure of the described stainless steel structure. 3. The high-strength bolted friction joint structure of a stainless steel structure according to claim 1, wherein the stainless steel powder contained in the coating layer is of the same steel type as the stainless steel constituting each joining member. 4. The high-strength bolt friction joint structure of a stainless steel structure according to claim 1, wherein the high-strength bolt friction joint has a slip coefficient of 0.45 or more. 5. The joining surface of the joining member is subjected to a roughening treatment, and the thickness of the coating layer containing the stainless steel powder is 20 to
The high-strength bolt friction joint structure of the stainless steel structure according to any one of claims 1 to 4, which has a thickness of 200 µm.