JP2022143202A - Steel material joining structure - Google Patents

Abstract

To provide a steel material joining structure in which joining work is easy and steel materials can be joined to each other with high reliability.SOLUTION: A grooved joining plate 100 and a clamping member 120 are used, for example, when joining webs or flanges (hereinafter referred to as flanges or the like) of H-beams 200 (steel materials) to be joined in a steel beam. A pair of H-beams 200 have their ends butted against each other, and the grooved joining plates 100 are placed on both sides of each H-beams 200, such as the flange. At this time, multiple protrusions 13 and grooves 11 of the grooved joining plate 100 are arranged so as to face the H-shaped steel 200. In addition, a holding member 120 is arranged so as to span the pair of H-beams 200 and the pair of grooved joining plates 100, and is fixed to both flanges, etc., using high-strength bolts 101, nuts 102, etc.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a steel joining structure in which, for example, H-section steels are connected to each other.

Steel materials such as H-section steel are sometimes joined together by high-strength bolt friction joining using a splice plate. In this case, the splice plate is arranged along both steel materials and fastened to both steel materials using high-strength bolts, nuts, or the like.

Such a joint by high-strength bolt friction welding is configured to secure its proof strength by the axial force introduced to the high-strength bolt, the slip coefficient of the friction surface between the splice plate and the steel material, and the number of friction surfaces.

As a connection structure for such steel materials, a method of improving the slip coefficient of the friction surface by using a grooved splice plate in which approximately triangular protrusions are provided at a predetermined pitch has been proposed (for example, Patent Document 1: , 2).

Patent No. 2936455 Patent No. 3569758

By the way, in a steel material joining structure using a conventional grooved joint plate, the grooved joint plate is usually formed of one sheet of metal plate. When joining steel materials with a grooved joint plate, first, a pair of steel materials are placed so that their ends face each other, and in that state, the grooved joint plate is attached to the steel materials along the surfaces of both steel materials. After arranging so as to straddle, the work of fastening the grooved joining plate to both steel materials is performed.

For this reason, if misalignment occurs due to misalignment of the position and orientation of the steel materials in the work of arranging a pair of steel materials so as to face each other, it is necessary to properly arrange and fasten the grooved joining plate along the surface of the steel materials. can't As a result, for example, the protrusions of the grooved joining plate cannot be sufficiently bitten into the steel material, and the desired slip coefficient may not be obtained.

On the other hand, if the grooved joining plate is made of a material with low rigidity so as to absorb the misalignment even if there is misalignment between the steel materials, the hardness of the projecting portion will also decrease and the projecting portion will be There is a possibility that the desired slip coefficient cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a steel material joining structure that facilitates the joining operation and allows steel materials to be joined with high reliability.

The present invention for solving the aforementioned problems includes a pair of steel materials whose ends are butted against each other, a sandwiching member disposed so as to straddle the steel materials and sandwiching the steel materials, and the sandwiching member and the steel materials. and a grooved joint plate arranged between and the grooved joining plate is arranged separately from each of the steel materials without straddling a pair of the steel materials.

The protrusion and the groove may be formed on both sides of the grooved joining plate, and the protrusion may bite into both the steel material and the clamping member.

A pitch between the protrusions may be different on each surface of the grooved joining plate.

The protrusion and the groove may be formed only on the surface of the grooved joint plate facing the steel material, and the sandwiching member and the grooved joint plate may be fixed by welding or bolts.

According to the present invention, sufficient rigidity can be obtained by using the holding member and overlapping the joint plate with the groove and the holding member. Therefore, the grooved joining plate, which requires processing, can be made thin, and processing is easy.

In addition, by separately arranging the grooved joining plate with respect to each steel material to be joined, the grooved joining plate can be reliably fixed to each steel material even if there is misalignment. At this time, since only the clamping member is arranged so as to straddle the steel materials, there is a portion between the grooved joint plates where the grooved joint plate does not exist and only the clamping member is present. For this reason, compared to the portion overlapped with the grooved joining plate, the portion of the holding member has lower rigidity and becomes an easily deformable portion.

Therefore, even if there is misalignment between the steel materials, the misalignment can be absorbed by the deformation of the clamping member. For this reason, strict alignment at the time of disposing the steel materials can be omitted, and the joining work is facilitated. On the other hand, the grooved joining plate does not need to absorb misalignment between the steel materials. Therefore, the grooved joining plate can be formed of a material having higher rigidity than the holding member. As a result, the protrusions of the grooved joining plate can be sufficiently bitten into the steel material to obtain a high slip coefficient, and the steel materials can be joined together with high reliability.

In addition, by forming the protrusions and grooves on both sides of the grooved joining plate and making the protrusions bite into both the steel material and the clamping member, the contact surfaces of the grooved joining plate and the clamping member, and the grooved joining plate and the steel material Sufficient slip coefficient is obtained on both contact surfaces, and steel materials can be joined simply by tightening high-strength bolts. Therefore, the connecting structure is simple, and the joining work is further facilitated.

At this time, by making the distance between the protrusions on each surface of the grooved joining plate different, the grooved joining plate is formed in the shape of the protrusions suitable for the member to be joined between the sandwiching member and the steel material. It can be joined by biting into both the clamping member and the steel material.

In addition, by fixing the sandwiching member and the grooved joint plate by welding or bolting, the sandwiching member and the grooved joint plate can be kept in a fixed state in advance, so that the joint work at the site can be made easier. become easier.

Advantageous Effects of Invention According to the present invention, it is possible to provide a steel material joining structure that facilitates the joining operation and allows steel materials to be joined with high reliability.

FIG. 3 shows a joint plate 100 with grooves; (a) and (b) are cross-sectional views in the thickness direction of a clamping member 120 to which the grooved joining plate 100 is fixed. (a) is a diagram showing a steel material joining structure 300 using a sandwiching member 120 to which a grooved joining plate 100 is fixed. (b) is a diagram showing a cross section of the joint portion of (a). (a) is a view showing a cross section in the thickness direction of the grooved joining plate 100, and (b) is an enlarged view of part A of (a). (a) and (b) are diagrams showing cross sections in the thickness direction of the joint plate 100a with grooves. FIG. 4 is a view showing a cross section of a connecting portion of a steel material joining structure 300a using a grooved joining plate 100a and a sandwiching member 120; The figure which shows the joint plate 100b with a groove.

[First Embodiment]
Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing a grooved joining plate 100 according to a first embodiment of the present invention. The grooved joining plate 100 is a so-called splice plate, and is used, for example, for joining H-section steel webs, flanges, and the like.

A grooved joining plate 100, which is a plate-shaped member, has a plurality of protrusions 13 arranged in parallel on at least one surface in contact with an object to be joined. That is, the grooves 11 are formed in parallel between the adjacent protrusions 13 . In the illustrated example, the projections 13 and the grooves 11 are formed only on one surface of the grooved bonding plate 100, which is the surface facing the object to be bonded. Also, a plurality of through holes 12 are formed for passing high-strength bolts.

As shown in FIG. 2(a), one surface of the joint plate 100 with grooves is formed with the protrusion 13 and the groove 11, and the clamping member 120 is fixed to the other surface. The sandwiching member 120 may be made of the same material as the grooved joining plate 100, but surface treatment is unnecessary. Also, the clamping member 120 may be made of a material that is softer than the joint plate 100 with grooves.

In the example shown in FIG. 2( a ), the grooved joining plate 100 and the sandwiching member 120 are joined by a welded portion 121 . Alternatively, the grooved joining plate 100 and the holding member 120 may be joined together by bolts 123, as shown in FIG. 2(b). Although not shown, the clamping member 120 is formed with through holes at positions corresponding to the through holes 12 of the joint plate 100 with grooves.

FIG. 3(a) is a view showing a steel material joining structure 300 in which steel materials to be joined are joined together using a grooved joining plate 100 and a sandwiching member 120, and FIG. 3(b) is a cross-sectional view of the joint. is. Although the clamping member 120 and the joint plate 100 with grooves are joined by bolts 123, they may be joined by welding.

The grooved joining plate 100 and the clamping member 120 are used, for example, when joining webs or flanges (hereinafter referred to as flanges) of H-shaped steel 200 (steel material) to be joined in steel beams. A pair of H-section steels 200 are butted end-to-end, and the grooved joining plates 100 are arranged on both sides of the respective H-section steels 200, such as flanges. At this time, the plurality of projections 13 and grooves 11 of the grooved joining plate 100 are arranged so as to face the H-shaped steel 200 . That is, the grooved joining plate 100 is arranged separately from each of the H-section steels 200 without straddling the pair of H-section steels 200 .

A sandwiching member 120 is arranged so as to straddle the pair of H-section steels 200 and the pair of grooved joint plates 100, and is fixed to both flanges or the like using high-strength bolts 101, nuts 102, and the like. That is, the grooved joint plate 100 is arranged between the sandwiching member 120 and the H-shaped steel 200, and the sandwiching member 120 is arranged so as to straddle the pair of H-shaped steels 200, and the grooved joint plate 100 and the sandwiched The H-section steel 200 is sandwiched between the member 120 and the member 120 .

As described above, through holes are formed in the grooved joining plate 100 and the holding member 120 . The through holes of the pair of grooved joining plates 100 and the clamping member 120 sandwiching the H-section steel 200 and the through holes formed in the H-section steel 200 are arranged on a straight line. It is inserted and fixed by a nut 102 . By tightening the high-strength bolt 101, the protrusion 13 of the grooved joining plate 100 bites into the H-section steel 200, and the H-section steel 200 can be joined together.

For the grooved joining plate 100, for example, a metal plate made of rolled steel for general structure, rolled steel for building structure, rolled steel for welding structure, carbon steel for machine structure, alloy steel for machine structure, or the like is used. . In addition, the total thickness of the holding members 120 not including the grooved joining plate 100 is set according to the thickness of the object to be joined. is set to

Note that the grooved joining plate 100 used for web joining and the grooved joining plate 100 used for flange joining may differ in the forming direction of the protrusions 13 with respect to the forming direction of the through holes 12 . The grooved joining plate 100 shown in FIG. 1 is used for joining webs together. In this case, the formation direction of the grooves 11 (protrusions 13) is formed substantially perpendicular to the butting direction (that is, joining direction) of the H-shaped steels 200 . For this reason, by sandwiching the grooved joining plate 100 from both sides of the web and tightening the high-strength bolt 101, the tip of the protrusion 13 is bitten into the web, and as a result, a tensile force is applied to the joint between the H-section steels 200. Even if this occurs, the grooved joining plate 100 and the H-section steel 200 are unlikely to slip, and the H-section steels 200 can be reliably joined together.

Next, details of the protrusion 13 and the groove 11 of the joint plate 100 with groove will be described. FIG. 4(a) is a cross-sectional view of the grooved joint plate 100 in the thickness direction, and FIG. 4(b) is an enlarged view of part A in FIG. 4(a). As described above, the protrusions 13 and the grooves 11 are alternately formed on one surface of the grooved joining plate 100 (referred to as the protrusion-forming surface 111).

The protrusions 13 are approximately isosceles triangles (including equilateral triangles), and the distance between the tips of the protrusions 13 is L1 (see FIG. 4B). That is, the protrusions 13 and the grooves 11 are arranged at the equal pitch L1. The pitch L1 of the projections 13 is desirably about 0.1 mm to 3.0 mm, more desirably 0.5 mm to 2.0 mm.

The protrusion 13 is formed by a straight slope. It should be noted that the angle formed by the straight slopes forming the protrusion 13 is set to 60° to 120°. If the angle is too small, the rigidity of the protrusion 13 will be reduced. On the other hand, if the angle is too large, it becomes difficult to bite into the steel material, and the width of the protrusions 13 increases, so the number of protrusions 13 decreases and the coefficient of slip with respect to the steel material decreases.

Here, assuming that the surface connecting the bases of the linear slopes forming the protrusion 13 is a reference plane (B in the figure), the tip side (upper in the figure) of the reference plane B is the protrusion 13, The groove portion 11 is located between the portions 13 and on the base side (lower side in the figure) than the reference plane B. As shown in FIG. The groove portion 11 is formed in an arc shape with respect to the reference plane B as a whole.

Here, assuming that the width of the groove 11 on the reference plane B is L2 (see FIG. 4B), L1 (projection pitch)/L2 (groove width) is preferably 2 or more and 10 or less. For example, if the tip angle of the protrusion 13 is constant and L1/L2 is less than 2, the width of the groove 11 becomes too wide and the number of protrusions 13 decreases, making it difficult to ensure a high slip coefficient. On the other hand, if the width of the groove portion 11 is constant and L1/L2 is less than 2, the protrusion 13 becomes too thin and sharp, and the rigidity of the protrusion 13 decreases.

If the angle of the protrusion 13 is constant and L1/L2 is more than 10, the width of the groove 11 becomes too narrow, resulting in poor manufacturability and less effect of alleviating stress concentration in the groove 11 . On the other hand, if the width of the groove 11 is constant and L1/L2 exceeds 10, the number of projections 13 is reduced, making it difficult to ensure a high slip coefficient.

Further, as shown in FIG. 4B, when the height of the protrusion 13 from the reference plane B is H1 and the depth of the groove 11 from the reference plane B is H2, H1/H2 is 3. More than 15 or less is desirable. If H1/H2 is less than 3, the height of the projecting portion 13 is too low, and a sufficient amount of biting into the steel material cannot be ensured.

On the other hand, if H1/H2 exceeds 15, the height of the projection 13 becomes too high, and the rigidity of the projection 13 becomes insufficient. Is required. Further, if the depth of the groove 11 is too small, the stress relaxation effect is reduced, and when the protrusion 13 is bitten into the steel material, the deformed portion of the steel material (the bulging portion due to the biting of the protrusion 13) is offset by the groove 11 . difficult to absorb.

The surface layer of the protrusion forming surface 111 on at least one surface of the grooved joining plate 100 is subjected to surface treatment (for example, nitriding treatment), and the hardness of the flange of the H-section steel 200 to be joined is higher than that of the flange. It also has high hardness. Here, it is desirable that the Vickers hardness of the projection forming surface 111 after surface treatment is at least twice the Vickers hardness of the surface of the raw material before treatment. It should be noted that the Vickers hardness of the surface of the raw material before treatment can be measured at a portion sufficiently distant from the surface in the cross section of the grooved joint plate 100 .

Such a grooved joining plate 100 can be manufactured by the method disclosed in Japanese Patent Laid-Open No. 2018-164956, for example. According to this method, the tip of the projection 13 can be sharpened, and the groove 11 can be easily formed into an arc shape.

As described above, in this embodiment, by using the holding member 120, rigidity can be obtained by the holding member 120 even if the thickness of the joint plate 100 with grooves is reduced. By thinning the grooved joining plate 100 for performing grooving and the like in this manner, processing becomes easier.

Also, the grooved joining plate 100 is arranged separately without straddling the pair of H-section steels 200 . Therefore, each grooved joining plate 100 can be brought into surface contact with the H-section steel 200 reliably. On the other hand, since only the clamping member 120 is arranged so as to straddle the steel materials, there is a portion between the grooved joint plates 100 where the grooved joint plate 100 does not exist and only the clamping member 120 is present. For this reason, compared with the portion superimposed on the joint plate 100 with grooves, the portion of the holding member 120 has lower rigidity and becomes an easily deformable portion.

Therefore, even if there is misalignment between the H-section steels 200 , the misalignment can be absorbed by the deformation of the holding member 120 . Therefore, strict alignment at the time of arranging the H-shaped steel 200 can be omitted, and the joining work is facilitated.

On the other hand, since the grooved joining plate 100 does not absorb misalignment between the H-shaped steels 200 , it can be made of a material having higher rigidity than the sandwiching member 120 . For this reason, it is possible to obtain a high coefficient of slip by allowing the protrusion 13 to sufficiently bite into the H-section steel 200, and to obtain a highly reliable steel connection structure.

Further, by forming the protrusion 13 into a shape that satisfies a specific condition, when the steel materials are joined using this, the protrusion 13 can surely bite into the steel material and a high slip coefficient can be obtained. Moreover, stress concentration does not occur in the groove portion 11, and manufacturing is easy.

In addition, by applying surface treatment to make the hardness of the surface layer of the protrusion forming surface 111 twice or more that of the steel materials to be joined, the tips of the protrusions 13 can be made to bite into the steel material to exhibit a non-slip effect. can.

[Second embodiment]
Next, a second embodiment will be described. In the following description, the same reference numerals as those in FIGS. 1 to 4 are given to the structures having the same functions as in the first embodiment, and duplicate descriptions are omitted.

FIG. 5(a) is a cross-sectional view showing a grooved joining plate 100a according to the second embodiment. The grooved joining plate 100a has substantially the same configuration as the grooved joining plate 100, but differs in that the protrusions 13 and the grooves 11 are formed on both sides.

The projections 13 and the grooves 11 formed on both surfaces of the grooved joining plate 100a are formed in the same direction. As shown in FIG. 5A, the distances (pitch of the protrusions 13) L1a and L1b between the protrusions 13 on both sides and the height of the protrusions 13 may be the same. As shown in (b), the distances L1a and L1b between the protrusions 13 may be different on each surface of the grooved joining plate 100a. Moreover, the height of the protrusions 13 may be different on each surface of the grooved joining plate 100a. In the joint plate 100a with grooves, it is sufficient that at least one surface satisfies the height ratio and width ratio between the protrusions 13 and the grooves 11 described above. It is desirable to satisfy the height ratio and width ratio of 11.

FIG. 6 is a diagram showing a steel material joining structure 300a using the grooved joining plate 100a. Similar to the steel joining structure 300 , the steel joining structure 300 a sandwiches the grooved joining plate 100 a and the H-shaped steel 200 between the sandwiching members 120 and is fixed by the high-strength bolt 101 and the nut 102 . At this time, the sandwiching member 120 and the joint plate 100a with grooves are not joined by welding or bolts, but rather, the protrusions 13 of the joint plate 100a with grooves bite into the sandwiching member 120, thereby preventing displacement between the two. both are fixed. That is, the protrusions 13 on the outer surface side of the grooved joint plate 100 a bite into the holding member 120 , and the protrusions 13 on the inner surface side of the grooved joint plate 100 a bite into the H-section steel 200 . Note that the grooved joint plate 100a and the clamping member 120 may be temporarily joined with bolts or the like in order to improve work efficiency.

At this time, the holding member 120 and the H-shaped steel 200 may differ in material, hardness, and the like. In this case, there is an appropriate pitch and height of the projections 13 for each member. For this reason, by changing the distance and height between the protrusions 13 on both sides so that the protrusions 13 are suitable for the members contacting both sides of the grooved joint plate 100a, the clamping member 120 and H can be efficiently separated. The protrusions 13 can be made to bite into both of the shaped steels 200 .

According to the second embodiment, effects similar to those of the first embodiment can be obtained. Moreover, by forming the protrusions 13 on both surfaces of the grooved joint plate 100a, it is not necessary to firmly join the holding member 120 and the grooved joint plate 100a. Therefore, a joining member between the holding member 120 and the joint plate 100a with grooves is not necessary, or even if they are joined, they can be joined only temporarily.

[Third embodiment]
Next, a third embodiment will be described. FIG. 7 is a perspective view showing a grooved joining plate 100b according to the third embodiment. The grooved joining plate 100b has substantially the same configuration as the grooved joining plate 100, but differs in that the protrusions 13 and the grooves 11 are formed in two directions.

The grooved joining plate 100b is provided with a plurality of protrusions 13 on at least one surface in contact with an object to be joined. Grooves 11a and 11b are formed between adjacent protrusions 13, respectively. The grooves 11a, which are the first grooves, are arranged parallel to each other. Similarly, the grooves 11b, which are the second grooves, are arranged parallel to each other. The groove portion 11a and the groove portion 11b are formed in directions different from each other.

In the illustrated example, the grooves 11a and 11b are provided so as to be orthogonal to each other, but the angle between the grooves 11a and 11b is not limited to 90 degrees. Moreover, in the illustrated example, the protrusion 13 and the grooves 11a and 11b are formed only on one side, but they may be formed on both sides. In the grooved joining plate 100b, at least one of the grooves 11a and 11b may satisfy the height ratio and width ratio between the projection 13 and the groove 11. , it is desirable to satisfy the height ratio and width ratio of the protrusion 13 and the groove 11 described above.

According to the third embodiment, effects similar to those of the first embodiment can be obtained. In addition, since the grooves 11a and 11b are provided in different directions, the number of angular portions of the projections 13 increases, the projections 13 can be meshed with each other depending on the object to be welded, and the slip coefficient can be increased. .

Moreover, a high slip coefficient can be obtained not only in the tensile direction between the H-section steels 200 but also in the shear direction between the H-section steels 200 . Moreover, when joining the H-section steel 200, the same member can be used without changing the formation direction of the grooves and protrusions between the web joining and the flange joining.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope of the technical ideas disclosed in the present application, and these also belong to the technical scope of the present invention. Understood.

11, 11a, 11b Grooves 12 Through holes 13 Protrusions 100, 100a, 100b Grooved joining plates 101 High-strength bolts 102 Nuts 111 Protrusions Part-forming surface 120 …… Sandwiching member 121 …… Welded portion 123 …… Bolt 200 …… H-shaped steel 300, 300a …… Steel material joining structure

Claims (4)

a pair of steel materials whose ends are butted together;
a sandwiching member disposed so as to straddle the steel materials and sandwiching the steel materials;
a grooved joint plate disposed between the holding member and the steel material;
and
The grooved joining plate has a plurality of protrusions and grooves formed between the protrusions at least on the surface facing the steel material,
A steel material joining structure, wherein the grooved joining plate is arranged separately from each of the steel materials without straddling the pair of steel materials. 2. The steel material joining structure according to claim 1, wherein said protrusion and said groove are formed on both sides of said grooved joining plate, and said protrusion bites into both said steel material and said clamping member. 3. The steel joining structure according to claim 2, wherein pitches between said projections are different on each surface of said grooved joining plate. The protrusion and the groove are formed only on a surface of the grooved joint plate facing the steel material, and the sandwiching member and the grooved joint plate are fixed by welding or bolts. Item 1. The steel material joining structure according to Item 1.

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