Steel joint structure

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]

[0001] The present invention relates to a steel joint structure in which, for example, H-shaped steel beams are connected to each other. [Background technology]

[0002] Steel members such as H-beams can be joined together using high-strength bolt friction joints with splice plates. In this case, the splice plates are placed along both steel members and fastened to them using high-strength bolts and nuts.

[0003] The strength of such a joint using high-strength bolt friction joints is ensured by the axial force applied to the high-strength bolts, the slip coefficient of the friction surfaces between the splice plate and the steel material, and the number of friction surfaces.

[0004] As a connection structure for such steel materials, a method has been proposed in which a grooved splice plate with approximately triangular protrusions provided at a predetermined pitch is used to improve the coefficient of slip of the friction surface (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 2936455 [Patent Document 2] Patent No. 3569758 Summary of the Invention [Problem to be solved by the invention]

[0006] In a conventional steel joining structure using a grooved joint plate, the grooved joint plate is usually formed from a single metal plate. When joining steel materials with a grooved joint plate, a pair of steel materials is first arranged so that their ends face each other, and then the grooved joint plate is placed along the surfaces of both steel materials so that it spans the steel materials, and then the grooved joint plate is fastened to both steel materials.

[0007] Therefore, if the position or orientation of the steel members is misaligned when arranging them so that they are butted together, the grooved joint plate cannot be properly positioned and fastened along the surface of the steel members. As a result, for example, the protrusions of the grooved joint plate cannot be sufficiently inserted into the steel members, and the desired slip coefficient may not be achieved.

[0008] On the other hand, if the grooved joining plate is made of a material with low rigidity so that it can absorb any misalignment between the steel materials, the hardness of the protrusions will also decrease, and the protrusions will not be able to sufficiently penetrate into the steel materials, which may make it impossible to obtain the desired slip coefficient.

[0009] The present invention has been made in consideration of the above problems, and aims to provide a steel material joining structure that allows easy joining work and highly reliable joining of steel materials. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the present invention provides a structure including a pair of steel materials having ends butted against each other, a clamping member disposed across the steel materials and clamping the steel materials, On both sides of the steel material, and a grooved joint plate arranged between the clamping member and the steel material, the grooved joint plate having, at least on a surface facing the steel material, a plurality of protrusions arranged in parallel with each other and a plurality of grooves formed in parallel between the protrusions, the grooved joint plate being arranged so that the protrusions are arranged in the direction in which the steel materials face each other, the grooved joint plate does not straddle the pair of steel materials but is arranged separately for each of the steel materials, the protrusions and the grooves are formed only on the surface of the grooved joint plate facing the steel material, the clamping member and the grooved joint plate are fixed together by welding or bolts, a plurality of through holes are formed in the grooved joint plate in the direction in which the protrusions are formed and a plurality of through holes are formed in the grooved joint plate in a direction perpendicular to the direction in which the protrusions are formed, the grooved joint plate A plurality of through holes formed in the clamping member and the steel material are arranged in a straight line, and high-strength bolts are inserted into the through holes arranged in a straight line, The grooved joining plate The clamping member to which the For each of the pair of steel materials, High strength bolt ByThis is a steel joint structure characterized by being fixed.

[0014] According to the present invention, sufficient rigidity can be obtained by overlapping the grooved joint plate and the clamping member using the clamping member. Therefore, the grooved joint plate, which requires processing, can be made thin, making processing easy.

[0015] Furthermore, by separately placing the grooved joint plates on each steel material to be joined, the grooved joint plates can be reliably fixed to each steel material even if there is misalignment. In this case, since only the clamping member is placed so that it straddles the steel materials, there are areas between the grooved joint plates where only the clamping member is present and no grooved joint plate is present. Therefore, compared to the area overlapping the grooved joint plate, the rigidity of the clamping member in this area is lower and it becomes an easily deformed area.

[0016] Therefore, even if there is misalignment between the steel materials, the misalignment can be absorbed by the deformation of the clamping member. This eliminates the need for strict alignment when placing the steel materials, making the joining process easier. On the other hand, grooved joining plates do not need to absorb misalignment between the steel materials. This allows the grooved joining plate to be made of a material with higher rigidity than the clamping member. As a result, the protrusions of the grooved joining plate can be sufficiently inserted into the steel materials, achieving a high coefficient of slip, and allowing steel materials to be joined together with high reliability.

[0019] In addition, by fixing the clamping member and the grooved joint plate with welding or bolts, the clamping member and the grooved joint plate can be fixed in advance, making the joining work on site easier. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a steel material joining structure that allows easy joining work and highly reliable joining of steel materials. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 2 is a diagram showing a grooved joining plate 100. [Figure 2] 10(a) and 10(b) are cross-sectional views in the thickness direction of a clamping member 120 to which a grooved joining plate 100 is fixed. [Figure 3] 1(a) is a diagram showing a steel joint structure 300 using a clamping member 120 to which a grooved joint plate 100 is fixed, and FIG. 1(b) is a diagram showing a cross section of the joint in FIG. [Figure 4] 1A is a view showing a cross section of a grooved joint plate 100 in the thickness direction, and FIG. 1B is an enlarged view of part A in FIG. 1A. [Figure 5] 1(a) and 1(b) are diagrams showing a cross section of a grooved joining plate 100a in the thickness direction. [Figure 6] 1 is a cross-sectional view of a connection portion of a steel joint structure 300a using a grooved joint plate 100a and a clamping member 120. FIG. [Figure 7] FIG. 10 is a diagram showing a grooved joining plate 100b. DETAILED DESCRIPTION OF THE INVENTION

[0022] [First embodiment] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0023] 1 is a diagram showing a grooved joint plate 100 according to a first embodiment of the present invention. The grooved joint plate 100 is a so-called splice plate, and is used, for example, when joining the web or flange portion of an H-shaped steel beam.

[0024] The grooved joint plate 100, which is a plate-like member, has a plurality of protrusions 13 arranged in parallel on at least one surface that contacts the joint object. That is, grooves 11 are formed in parallel between adjacent protrusions 13. In the illustrated example, the protrusions 13 and grooves 11 are formed only on one surface of the grooved joint plate 100, which is the surface facing the joint object. In addition, a plurality of through holes 12 are formed to pass high-strength bolts through.

[0025] As shown in Figure 2(a), a grooved joint plate 100 has a protrusion 13 and a groove 11 formed on one surface thereof, and a clamping member 120 fixed to the other surface thereof. The clamping member 120 may be made of the same material as the grooved joint plate 100, but surface treatment is not required. The clamping member 120 may also be made of a material softer than the grooved joint plate 100.

[0026] In the example shown in Fig. 2(a), the grooved joint plate 100 and the clamping member 120 are joined by a welded portion 121. Alternatively, as shown in Fig. 2(b), the grooved joint plate 100 and the clamping member 120 may be joined by a bolt 123. Although not shown, the clamping member 120 has a through hole formed in a position corresponding to the through hole 12 of the grooved joint plate 100.

[0027] Fig. 3(a) is a diagram 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 clamping member 120, and Fig. 3(b) is a cross-sectional view of the joint. Note that, although an example is shown in which the clamping member 120 and the grooved joining plate 100 are joined with a bolt 123, they may also be joined by welding.

[0028] The grooved joint plate 100 and clamping member 120 are used, for example, when joining webs or flanges (hereinafter referred to as flanges, etc.) of H-shaped steel 200 (steel material) to be joined in a steel beam. The ends of a pair of H-shaped steel 200 are butted together, and the grooved joint plate 100 is placed on both sides of the flanges, etc. of each H-shaped steel 200. At this time, the grooved joint plate 100 is placed so that the multiple protrusions 13 and grooves 11 face the H-shaped steel 200. In other words, the grooved joint plate 100 does not straddle the pair of H-shaped steel 200, but is placed separately for each H-shaped steel 200.

[0029] Furthermore, a clamping member 120 is arranged so as to straddle the pair of H-shaped steel beams 200 and the pair of grooved joint plates 100, and is fixed to both flanges etc. using high-strength bolts 101, nuts 102 etc. In other words, the grooved joint plates 100 are arranged between the clamping member 120 and the H-shaped steel beams 200, and the clamping member 120 is arranged so as to straddle the pair of H-shaped steel beams 200, and the H-shaped steel beams 200 are sandwiched between the grooved joint plates 100 and the clamping member 120.

[0030] As described above, through holes are formed in the grooved joint plates 100 and the clamping members 120. The through holes of the pair of grooved joint plates 100 and clamping members 120 that sandwich the H-shaped steel 200 are aligned with the through holes formed in the H-shaped steel 200, and high-strength bolts 101 are inserted into the through holes 12 and fixed with nuts 102. By tightening the high-strength bolts 101, the protrusions 13 of the grooved joint plates 100 bite into the H-shaped steel 200, and the H-shaped steels 200 can be joined together.

[0031] For the grooved joining plate 100, for example, a metal plate made of rolled steel for general structure, rolled steel for architectural structure, rolled steel for welded structure, carbon steel for mechanical structure, alloy steel for mechanical structure, etc. The total thickness of the clamping member 120 excluding the grooved joining plate 100 is set according to the thickness of the objects to be joined, and for example, is set so that the total thickness of the two clamping members 120 sandwiching the steel material is equal to or greater than the thickness of a flange or the like.

[0032] Note that the grooved joint plate 100 used for joining webs and the grooved joint plate 100 used for joining flanges may have different projections 13 formed in a direction relative to the direction of the through holes 12. The grooved joint plate 100 shown in FIG. 1 is used for joining webs together. In this case, the grooves 11 (projections 13) are formed in a direction approximately perpendicular to the butt joint direction (i.e., the joining direction) of the H-shaped steel beams 200. Therefore, by sandwiching the grooved joint plate 100 from both sides of the web and tightening the high-strength bolts 101, the tips of the projections 13 are forced into the web. As a result, even if tensile force is generated at the joint between the H-shaped steel beams 200, slippage between the grooved joint plate 100 and the H-shaped steel beams 200 is unlikely to occur, and the H-shaped steel beams 200 can be reliably joined together.

[0033] Next, the protrusions 13 and grooves 11 of the grooved joint plate 100 will be described in detail. Fig. 4(a) is a view showing a cross section 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 grooves 11 are formed alternately on one surface (referred to as the protrusion forming surface 111) of the grooved joint plate 100.

[0034] The protrusions 13 are substantially isosceles triangles (including equilateral triangles), and the distance between the tips of the protrusions 13 is L1 (see FIG. 4(b)). That is, the protrusions 13 and the grooves 11 are arranged at a regular pitch L1. The pitch L1 of the protrusions 13 is preferably about 0.1 mm to 3.0 mm, and more preferably 0.5 mm to 2.0 mm.

[0035] The protrusions 13 are formed by linear inclined surfaces. The angle formed by the linear inclined surfaces constituting the protrusions 13 is set to 60° to 120°. If the angle is too small, the rigidity of the protrusions 13 decreases. If the angle is too large, the protrusions 13 become difficult to bite into the steel material, and the width of the protrusions 13 increases, which reduces the number of protrusions 13 and reduces the coefficient of slip on the steel material.

[0036] Here, if the plane connecting the bases of the linear inclined surfaces that make up the protrusions 13 is taken as the reference plane (B in the drawing), the tip side of the reference plane B (upper in the drawing) is the protrusions 13, and the base side of the reference plane B between the protrusions 13 (lower in the drawing) is the grooves 11. The grooves 11 are formed in an arc shape as a whole relative to the reference plane B.

[0037] Here, if the width of groove 11 on reference plane B is L2 (see FIG. 4(b)), it is desirable that L1 (protrusion pitch) / L2 (groove width) be 2 or more and 10 or less. For example, if the tip angle of protrusion 13 is kept constant and L1 / L2 is less than 2, the width of groove 11 becomes too wide, reducing the number of protrusions 13 and making it difficult to ensure a high slip coefficient. On the other hand, if the width of groove 11 is kept constant and L1 / L2 is less than 2, protrusions 13 become too thin and sharp, reducing the rigidity of protrusions 13.

[0038] Furthermore, if the angle of the protrusions 13 is kept constant and L1 / L2 exceeds 10, the width of the grooves 11 becomes too narrow, which reduces manufacturability and reduces the effect of alleviating stress concentration in the grooves 11. On the other hand, if the width of the grooves 11 is kept constant and L1 / L2 exceeds 10, the number of protrusions 13 decreases, making it difficult to ensure a high slip coefficient.

[0039] 4(b), 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, it is desirable that H1 / H2 be equal to or greater than 3 and equal to or less than 15. If H1 / H2 is less than 3, the height of the protrusion 13 becomes too low, and it is not possible to ensure a sufficient amount of penetration into the steel material.

[0040] Furthermore, if H1 / H2 exceeds 15, the height of the protrusion 13 becomes too great, resulting in insufficient rigidity of the protrusion 13 and excessive penetration into the steel material, requiring a greater tightening force. Furthermore, if the depth of the groove 11 becomes too small, the stress relaxation effect decreases and, when the protrusion 13 is penetrated into the steel material, it becomes difficult for the groove 11 to absorb the deformed portion of the steel material (the bulge caused by the penetration of the protrusion 13).

[0041] The surface of the protrusion-forming surface 111 on at least one side of the grooved joining plate 100 has been subjected to a surface treatment (such as nitriding), making it harder than the flanges of the H-shaped steel 200 to be joined. Here, it is desirable that the Vickers hardness of the protrusion-forming surface 111 after the surface treatment is at least twice the Vickers hardness of the surface of the material before the treatment. The Vickers hardness of the surface of the material before the treatment can be measured at a location sufficiently distant from the surface on the cross section of the grooved joining plate 100.

[0042] Such a grooved joint plate 100 can be manufactured by, for example, the method disclosed in Japanese Patent Application Laid-Open No. 2018-164956. This method allows the tip of the protrusion 13 to be sharpened, and the groove 11 to be easily formed into an arc shape.

[0043] As described above, in this embodiment, by using the clamping member 120, even if the thickness of the grooved joint plate 100 is reduced, rigidity can be obtained by the clamping member 120. By thinning the grooved joint plate 100, which is subjected to groove processing, etc., in this way, processing becomes easier.

[0044] Furthermore, the grooved joint plates 100 are arranged separately from each other without spanning a pair of H-shaped steel beams 200. This allows each grooved joint plate 100 to be reliably in surface contact with the H-shaped steel beams 200. On the other hand, since only the clamping members 120 are arranged to span the steel materials, there are portions between the grooved joint plates 100 where there are only the clamping members 120 and no grooved joint plates 100. Therefore, compared to the portions overlapping the grooved joint plates 100, the rigidity of these portions of the clamping members 120 is lower, making them easily deformable portions.

[0045] Therefore, even if the H-shaped steels 200 are misaligned with each other, the misalignment can be absorbed by the deformation of the clamping member 120. Therefore, strict alignment when arranging the H-shaped steels 200 can be omitted, making the joining work easier.

[0046] On the other hand, since the grooved connecting plate 100 does not absorb misalignment between the H-shaped steels 200, it can be made of a material with higher rigidity than the clamping member 120. Therefore, the protrusions 13 can be made to sufficiently bite into the H-shaped steels 200 to obtain a high coefficient of slip, thereby obtaining a highly reliable steel connection structure.

[0047] Furthermore, by forming the protrusions 13 in a shape that satisfies specific conditions, when steel materials are joined using this, the protrusions 13 can be reliably inserted into the steel materials, thereby obtaining a high coefficient of slip. In addition, no stress concentration occurs in the grooves 11, making manufacturing easy.

[0048] Furthermore, by performing a surface treatment to make the surface of the protrusion forming surface 111 at least twice as hard as the steel material to be joined, the tip of the protrusion 13 can be made to bite into the steel material, providing an anti-slip effect.

[0049] [Second embodiment] Next, a second embodiment will be described. In the following description, components that have the same functions as those in the first embodiment will be given the same reference numerals as those in Figures 1 to 4, and redundant description will be omitted.

[0050] 5(a) is a cross-sectional view showing a grooved joint plate 100a according to the second embodiment. The grooved joint plate 100a has substantially the same configuration as the grooved joint plate 100, but differs in that the protrusions 13 and the grooves 11 are formed on both sides.

[0051] The projections 13 and grooves 11 formed on both sides of the grooved joint plate 100a are formed in the same direction. As shown in FIG. 5(a), the distances L1a and L1b between the projections 13 (the pitch of the projections 13) on both sides and the heights of the projections 13 may be the same. However, as shown in FIG. 5(b), the distances L1a and L1b between the projections 13 on each side of the grooved joint plate 100a may be different. The heights of the projections 13 on each side of the grooved joint plate 100a may also be different. While it is sufficient for the grooved joint plate 100a to satisfy the height ratio and width ratio between the projections 13 and the grooves 11 described above on at least one side, it is preferable that the height ratio and width ratio between the projections 13 and the grooves 11 described above be satisfied on both sides.

[0052] FIG. 6 is a diagram showing a steel joint structure 300a using a grooved joint plate 100a. Similar to the steel joint structure 300, the steel joint structure 300a is constructed by sandwiching the grooved joint plate 100a and an H-shaped steel beam 200 between clamping members 120 and securing them with high-strength bolts 101 and nuts 102. The clamping members 120 and the grooved joint plate 100a are not joined by welding or bolts; rather, the protrusions 13 of the grooved joint plate 100a bite into the clamping members 120, preventing misalignment and securing the two together. Specifically, the protrusions 13 on the outer surface of the grooved joint plate 100a bite into the clamping members 120, and the protrusions 13 on the inner surface of the grooved joint plate 100a bite into the H-shaped steel beam 200. To improve work efficiency, the grooved joint plate 100a and the clamping members 120 may be temporarily joined with bolts or the like.

[0053] In this case, the clamping member 120 and the H-shaped steel 200 may be made of different materials or have different hardness. In such cases, there is an appropriate pitch and height of the protrusions 13 for each member. Therefore, by changing the distance and height between the protrusions 13 on both sides so that the protrusions 13 are appropriate for the members that come into contact with both sides of the grooved joining plate 100a, the protrusions 13 can be efficiently inserted into both the clamping member 120 and the H-shaped steel 200.

[0054] According to the second embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, by forming the protrusions 13 on both sides of the grooved joint plate 100a, it is not necessary to firmly join the clamping member 120 and the grooved joint plate 100a. Therefore, a joining member between the clamping member 120 and the grooved joint plate 100a is not necessary, or even if joining is required, the joining can be only temporary.

[0055] [Third embodiment] Next, a third embodiment will be described. Fig. 7 is a perspective view showing a grooved joint plate 100b according to the third embodiment. The grooved joint plate 100b has substantially the same configuration as the grooved joint plate 100, but differs in that the protrusions 13 and grooves 11 are formed in two directions.

[0056] The grooved joining plate 100b has a plurality of protrusions 13 arranged side by side on at least one surface that contacts the joining object. Grooves 11a and 11b are formed between adjacent protrusions 13. The grooves 11a, which are first grooves, are arranged parallel to each other. Similarly, the grooves 11b, which are second grooves, are arranged parallel to each other. The grooves 11a and 11b are formed in different directions.

[0057] In the illustrated example, grooves 11a and 11b are arranged perpendicular to each other, but the angle between grooves 11a and 11b is not limited to 90 degrees. In the illustrated example, protrusions 13 and grooves 11a and 11b are formed on only one surface, but they may be formed on both surfaces. In grooved joining plate 100b, it is sufficient that at least one of grooves 11a and 11b satisfies the height ratio and width ratio between protrusions 13 and grooves 11 described above. However, it is preferable that both grooves 11a and 11b satisfy the height ratio and width ratio between protrusions 13 and grooves 11 described above.

[0058] According to the third embodiment, it is possible to obtain the same effects as those of the first embodiment. In addition, since the grooves 11a and 11b are provided in different directions, the number of angular portions of the protrusions 13 increases, which allows the protrusions 13 to be more meshed with the joining object, thereby increasing the slip coefficient.

[0059] Furthermore, a high slip coefficient can be obtained not only in the tensile direction between the H-shaped steels 200 but also in the shear direction between the H-shaped steels 200. Furthermore, when joining the H-shaped steels 200, it is not necessary to change the forming directions of the grooves and protrusions between the joining of the web and the joining of the flange, and the same members can be used.

[0060] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0061] 11, 11a, 11b……Groove 12...Through hole 13....Protrusion 100, 100a, 100b... Grooved joining plate 101...High strength bolt 102...Nut 111……Protrusion forming surface 120……Holding member 121...Welded section 123....Volts 200……H-beam steel 300, 300a……Steel joint structure

Claims

[Claim 1] A pair of steel members whose ends are butted together; a clamping member that is arranged so as to straddle the steel materials and sandwiches the steel materials; A grooved joining plate disposed between the clamping member and the steel material on both sides of the steel material; Equipped with The grooved joining plate has, at least on a surface facing the steel material, a plurality of protrusions arranged in parallel with each other and a plurality of grooves formed in parallel between the protrusions, The protrusions are arranged so that the juxtaposition direction is the opposing direction of the steel material, The grooved joint plate is not placed across the pair of steel materials, but is placed separately for each of the steel materials, The protrusion and the groove are formed only on the surface of the grooved joint plate facing the steel material, and the clamping member and the grooved joint plate are fixed by welding or bolts, A plurality of through holes are formed in the grooved joining plate in a direction in which the protrusions are formed, and a plurality of through holes are formed in a direction perpendicular to the direction in which the protrusions are formed, A steel material joining structure characterized in that a plurality of through holes formed in the grooved joining plate, the clamping member, and the steel material are arranged in a straight line, high-strength bolts are inserted into the through holes arranged in a straight line, and the clamping member to which the grooved joining plate is joined is fixed to each of the pair of steel materials by the high-strength bolts.

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