Grooved joint plate and steel joint structure

Abstract

To provide grooved joint plates that are easy to handle and provide a high sliding coefficient at low cost, and to provide steel joint structures using these plates.SOLUTION: A grooved joint plate 100, which is a plate-shaped member, is provided with a plurality of protrusions 13 arranged in parallel on at least one surface that is in contact with a joint object. That is, the grooves 11 are formed in parallel between the adjacent protrusions 13. In addition, a plurality of through holes 12 through which high-strength bolts pass is formed. A flat part 14 is formed at a substantially central part of the grooved joint plate 100 with respect to the direction in which the protrusions 13 are arranged side by side. The flat part 14 is a part where the protrusions 13 and the grooves 11 are not formed. That is, the protrusion 13 and the groove 11 are provided on both sides of the flat part 14, respectively. The flat part 14 is formed over the entire length in parallel to the protrusion 13 and the groove 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a grooved joint plate and a steel material joint structure for connecting, for example, H-shaped steel beams. [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] For this reason, the surface of the splice plate that comes into contact with the steel material is rusted or shot blasted to ensure a specified coefficient of slip (for example, 0.45 in the "Standard Specifications for Construction Works JASS6" compiled by the Architectural Institute of Japan).

[0005] However, due to the recent trend toward higher tensile strength and larger cross-section steel materials, the strength required for joints is also increasing. While it is possible to improve the strength by increasing the number of high-strength bolts, this comes at the cost of increased costs and labor.

[0006] On the other hand, if the slip coefficient of the friction surface is improved, it is possible to prevent an increase in the number of high-strength bolts. Patent Documents 1 and 2 describe examples of grooved splice plates with approximately triangular protrusions arranged at a predetermined pitch to improve the slip coefficient. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 2936455 [Patent Document 2] Patent No. 3569758 Summary of the Invention [Problem to be solved by the invention]

[0008] Grooved joining plates with the above-mentioned protrusions are manufactured by cutting a plate-shaped material with a cutter or the like. Therefore, cutting many grooves increases the processing cost. However, if the number of protrusions is reduced to reduce costs, the coefficient of slip with the joining object decreases, so a certain number of protrusions or more is required.

[0009] The present invention has been made in consideration of the above problems, and aims to provide a grooved joint plate that is easy to handle, has a high slip coefficient at low cost, and a steel joint structure using the same. [Means for solving the problem]

[0010] The first invention for solving the above-mentioned problems is a grooved joining plate that is arranged so as to straddle a pair of steel materials to be joined, whose ends are butted against each other, and is fixed so as to sandwich the steel materials, and joins the steel materials together, and at least one surface of the grooved joining plate has a plurality of protrusions that are parallel to each other and whose tips are to be inserted into the steel materials, And that Attached The direction is arranged so that it faces the steel material. A plurality of grooves are arranged parallel to each other between the protrusions, and a flat portion where the protrusions and the grooves are not formed is provided in a predetermined range in the approximate center of the width direction of the grooved joining plate in the direction of the arrangement of the protrusions. So as to be placed near the butt joint between the steel materials This grooved joint plate is formed parallel to the protrusion, the thickness of the grooved joint plate at the flat portion is thinner than the thickness of the grooved joint plate at the groove portion, the flat portion has lower rigidity than other portions, and serves as an easily deformable portion of the grooved joint plate.

[0012] On the other surface of the grooved joining plate, a plurality of other protrusions are arranged parallel to the protrusions, and a plurality of other grooves are arranged parallel to each other between the other protrusions, The flat portion may be formed on only one surface of the grooved joining plate.

[0013] On each surface of the grooved joining plate, the pitch between the protrusions and the pitch between the other protrusions. may be different.

[0014] According to the first aspect of the present invention, a flat portion is formed in the approximate center of the protrusions, eliminating the need to process the protrusions in the flat portion. However, since a predetermined clearance is often generated at the butt joint between the objects to be joined, even if a flat portion is formed, the number of protrusions that penetrate into the steel material can be ensured. This allows a high slip coefficient to be ensured.

[0015] Furthermore, by making the flat portion thinner than the other portions, the rigidity of the grooved joint plate can be reduced in that portion, forming an easily deformable portion. Therefore, even if there is misalignment in the orientation or position of the steel materials, the misalignment can be absorbed by the deformation of the flat portion. This eliminates the need for strict alignment when placing the steel materials, making the joining process easier.

[0016] Furthermore, if the protrusions and grooves are formed on both sides of the grooved joining plate, either side can be used to join steel materials. Furthermore, if a clamping member is used to clamp the grooved joining plate from the outside, the grooved joining plate can be inserted into both the clamping member and the steel materials to join them.

[0017] In this case, by making the distance between the protrusions on each surface of the grooved joining plate different, the grooved joining plate can be joined by biting into both the clamping member and the steel material with a protrusion shape that is suitable for the members to be joined, namely the clamping member and the steel material.

[0018] The second invention comprises a pair of steel materials whose ends are butted against each other, and a grooved joint plate that is fixed so as to straddle the steel materials and sandwich the steel materials, and the grooved joint plate has a plurality of protrusions arranged parallel to each other on at least the surface facing the steel materials, and a plurality of grooves arranged parallel to each other between the protrusions, and is arranged so that the direction in which the protrusions are arranged parallel to each other and the width direction of the grooved joint plate are the opposing direction of the steel materials, At least the surface facing the steel materialThis is a steel material joining structure characterized in that in a predetermined range at approximately the center of the width of the grooved joining plate, a flat portion where the protrusions and grooves are not formed is formed parallel to the protrusions, the flat portion is positioned near the butt joint between the steel materials, the thickness of the grooved joining plate at the flat portion is thinner than the thickness of the grooved joining plate at the groove portion, and the flat portion is deformable to absorb misalignment of the steel materials.

[0019] The joint may include a clamping member that is fixed across the steel materials and clamps the steel materials and the grooved joint plate, the protrusion and the groove being formed only on the surface of the grooved joint plate facing the steel material, and the clamping member and the grooved joint plate being fixed by welding or bolts.

[0020] The grooved joint plate has a plurality of protrusions and grooves formed between the protrusions on each of the surfaces facing the steel materials and the clamping member. The flat portion is formed only on the surface of the grooved joining plate facing the steel material. That's fine.

[0021] In this case, the pitch between the protrusions may be different on each surface of the grooved joining plate.

[0022] According to the second aspect of the present invention, a steel material joint structure can be obtained that is low cost and has a high slip coefficient, making it possible to reliably join steel materials together.

[0023] Furthermore, by using a clamping member to overlap the grooved joint plate and the clamping member, sufficient rigidity can be obtained. This allows the grooved joint plate, which requires processing, to be made thinner, making processing easier. Furthermore, 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.

[0024] Furthermore, by forming protrusions and grooves on both sides of the grooved joint plate and having the protrusions bite into both the steel material and the clamping member, a sufficient coefficient of slip is obtained at both the contact surfaces between the grooved joint plate and the clamping member and between the grooved joint plate and the steel material, allowing the steel materials to be joined simply by tightening high-strength bolts.This simplifies the connection structure and makes joining even easier.

[0025] In this case, by making the distance between the protrusions on each surface of the grooved joining plate different, the grooved joining plate can be joined by biting into both the clamping member and the steel material with a protrusion shape that is suitable for the members to be joined, namely the clamping member and the steel material. [Effects of the Invention]

[0026] According to the present invention, it is possible to provide a grooved joint plate that is easy to handle and has a high coefficient of slip at low cost, and a steel joint structure using the same. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view showing a grooved joining plate 100. [Figure 2] FIG. 1(a) is a diagram showing a steel joint structure 300 using a grooved joint plate 100, and FIG. 1(b) is a cross-sectional view of the joint portion. [Figure 3] 1A is a view showing a partial cross section in the thickness direction of a grooved joining plate 100, and FIG. 1B is an enlarged view of part A in FIG. [Figure 4] 1A is a cross-sectional view of the grooved joint plate 100 in the thickness direction, and FIG. 1B is an enlarged view of part E in FIG. 1A. [Figure 5] 10(a) and 10(b) are diagrams showing a state in which the grooved joining plate 100 is fixed to a clamping member 120. FIG. [Figure 6] 10 is a diagram showing a steel joint structure 300a using a clamping member 120 and a grooved joint plate 100. FIG. [Figure 7] 1(a) and 1(b) are diagrams showing a grooved joining plate 100a. [Figure 8] 10 is a diagram showing a steel joint structure 300b using a clamping member 120 and a grooved joint plate 100a. FIG. [Figure 9]FIG. 10 is a perspective view showing a grooved joining plate 100b. DETAILED DESCRIPTION OF THE INVENTION

[0028] [First embodiment] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0029] (Grooved joint plate 100) 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.

[0030] The grooved joining 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 joining object. That is, grooves 11 are formed in parallel between adjacent protrusions 13. Also, a plurality of through holes 12 are formed to pass high-strength bolts through.

[0031] The through holes 12 are arranged in two rows near both ends of the grooved joint plate 100 in the width direction (direction perpendicular to the formation direction of the protrusions 13). In this case, the through holes 12 may be arranged in a row in the juxtaposition direction of the protrusions 13 as shown in the figure, or adjacent through holes 12 may be arranged in a staggered pattern with mutual offset in the direction along the protrusions 13 (direction perpendicular to the width direction). By aligning the through holes 12 in the width direction, the length of the grooved joint plate 100 can be shortened, and by arranging the through holes 12 in a staggered pattern, the width of the grooved joint plate 100 can be narrowed. The number and arrangement of the through holes 12 are not limited to the example shown in the figure.

[0032] A flat portion 14 is formed in approximately the center of the grooved joining plate 100 in the direction in which the protrusions 13 are arranged. The flat portion 14 is a portion where the protrusions 13 and grooves 11 are not formed. In other words, the protrusions 13 and grooves 11 are arranged on both sides of the flat portion 14. The flat portion 14 is formed parallel to the protrusions 13 and grooves 11 over the entire length.

[0033] FIG. 2(a) is a diagram showing a steel material connection structure 300 in which steel materials to be joined are joined using a grooved joint plate 100, and FIG. 2(b) is a cross-sectional view of the joint. The grooved joint plate 100 is used, for example, when joining webs or flanges (hereinafter referred to as flanges, etc.) of H-shaped steel beams 200 (steel materials) to be joined. The ends of a pair of H-shaped steel beams 200 are butted together, and the grooved joint plate 100 is placed so as to straddle the flanges, etc., of the adjacent H-shaped steel beams 200 and is fixed to both flanges, etc., using high-strength bolts 101, nuts 102, etc. Note that the grooved joint plate 100 used to join webs and the grooved joint plate 100 used to join flanges may have different protrusions 13 formed in the direction relative to the direction of the through holes 12.

[0034] For example, metal plates 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. are used for the grooved joint plate 100. The total thickness of the two grooved joint plates 100 that sandwich the steel material is set according to the thickness of the objects to be joined, and is set, for example, so that the total thickness of the grooved joint plates 100 is equal to or greater than the thickness of a flange or the like.

[0035] The grooved joint plate 100 shown in Fig. 1 is used to join webs together. In this case, the direction in which the grooves 11 (protrusions 13) are formed is 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 fastening the high-strength bolts 101, the tips of the protrusions 13 formed on the surface facing the web are forced into the web. As a result, even if a tensile force is generated in 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.

[0036] Here, the grooved joint plate 100 is positioned so that the flat portion 14 is located near the butt joint between the H-shaped steels 200. Usually, a predetermined clearance is formed at the butt joint between the H-shaped steels 200. In this case, the protrusions 13 that bite into the H-shaped steels 200 are not required between the H-shaped steels 200. Even if there is almost no clearance between the H-shaped steels 200, deformation or thickness changes of the flanges or the like may occur at the tip of the H-shaped steels 200, and even if the protrusions 13 are formed, the desired slip coefficient may not be obtained at that portion.

[0037] In the present invention, by intentionally not forming protrusions 13 in a predetermined area of ​​the grooved joint plate 100 located near the butt joint between the H-shaped steel beams 200 and leaving flat areas 14, it is possible to reduce the processing costs of unnecessary or ineffective protrusions 13. In this case, even if the protrusions 13 are reduced, the slip coefficient does not decrease significantly, and a high slip coefficient can be ensured.

[0038] Next, details of the protrusions 13 and grooves 11 of the grooved joint plate 100 will be described. Fig. 3(a) is a view showing a cross section of the grooved joint plate 100 in the thickness direction, and Fig. 3(b) is an enlarged view of part A in Fig. 3(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.

[0039] The protrusions 13 are substantially isosceles triangles (including equilateral triangles), and the distance between the tips of the protrusions 13 is L1 (see FIG. 3(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.

[0040] 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.

[0041] Here, if the base of the linear inclined surface constituting the protrusion 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 protrusion 13, and the base side of the reference plane B between the protrusions 13 (lower in the drawing) is the groove 11. The groove 11 is formed in an arc shape as a whole relative to the reference plane B.

[0042] Here, if the width of the groove 11 on the reference plane B is L2 (see FIG. 3(b)), then L1 (protrusion pitch) / L2 (groove width) is set to be 2 or more and 10 or less. For example, if the tip angle of the protrusions 13 is kept constant and L1 / L2 is set to less than 2, the width of the 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 the groove 11 is kept constant and L1 / L2 is set to less than 2, the protrusions 13 become too thin and sharp, reducing the rigidity of the protrusions 13. Furthermore, if the angle of the protrusions 13 is kept constant and L1 / L2 is set to more than 10, the width of the groove 11 becomes too narrow, reducing manufacturability and reducing the effect of alleviating stress concentration in the groove 11. On the other hand, if the width of the groove 11 is kept constant and L1 / L2 is set to more than 10, the number of protrusions 13 decreases and making it difficult to ensure a high slip coefficient.

[0043] 3(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, H1 / H2 is set to 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.

[0044] 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).

[0045] 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.

[0046] 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.

[0047] As mentioned above, the grooved joint plate 100 has a flat portion 14 formed in the approximate center in the direction in which the protrusions 13 are arranged. FIG. 4(a) is a cross-sectional view of the grooved joint plate 100, and FIG. 4(b) is an enlarged view of portion E in FIG. 4(a). The flat portion 14 does not require processing of the protrusions 13. For example, a plate-like member having a thin thickness in the portion corresponding to the flat portion 14 may be used, and the protrusions 13 may be formed in a portion other than the flat portion. Alternatively, a plate-like member having approximately the same overall thickness may have the protrusions 13 formed in the portion excluding the flat portion 14, and the flat portion 14 may be thinned by cutting.

[0048] In this case, it is desirable that the thickness of the grooved joint plate 100 at the flat portion 14 (C in the figure) is thinner than the thickness (D in the figure, which is the thickness of the grooved joint plate 100 at the groove portion 11) other than the flat portion 14. In this way, by making the flat portion 14 thinner than other portions, the rigidity of that portion of the grooved joint plate 100 can be reduced, and therefore an easily deformable portion can be formed.

[0049] For example, when two H-shaped steel beams 200 are butted together, the centers of the H-shaped steel beams 200 may not completely align, resulting in misalignment. In this case, if the grooved joint plate 100 is arranged so as to straddle the H-shaped steel beams 200, it may be difficult to achieve complete surface contact between the two beams, for example, the grooved joint plate 100 may be in contact with one of the H-shaped steel beams 200 at an angle or may be in a floating state. Therefore, if the grooved joint plate is arranged so as to straddle the H-shaped steel beams 200, the penetration of the protrusions into one H-shaped steel beam 200 and the penetration of the protrusions into the other H-shaped steel beam 200 will differ, resulting in a decrease in the overall slip coefficient.

[0050] However, by forming a flat portion 14 as an easily deformable portion between the protrusions 13, the flat portion 14 deforms slightly when the high-strength bolt 101 is tightened, and this misalignment can be absorbed by the deformation of the flat portion 14. In other words, when a grooved joint plate 100 with an easily deformable portion formed approximately in the center in the width direction is tightened to an H-shaped steel 200, the flat portion 14 deforms, and the grooved joint plate 100 can be deformed to follow the misalignment. This eliminates the need for strict alignment when placing the H-shaped steel 200, making the joining work easier. Furthermore, since the protrusions 13 can be reliably inserted into the pair of H-shaped steels 200, a high slip coefficient can be obtained.

[0051] As described above, in this embodiment, by providing a flat portion 14 without forming a protrusion 13 in approximately the center of the grooved joint plate 100, which corresponds to the vicinity of the butt portion with the H-shaped steel 200, the processing area is reduced and processing is easier compared to when processing the protrusions 13 on the entire surface of the plate material. This reduces processing costs. Furthermore, even if the protrusions 13 were formed in this area, the protrusions 13 would not function or would not be able to stably ensure the amount of penetration of the protrusions 13. Therefore, even if the protrusions 13 are eliminated, the decrease in the slip coefficient of the grooved joint plate 100 as a whole is minimized, and a high slip coefficient can be ensured.

[0052] Furthermore, by making the thickness of the flat portion 14 thinner than other portions, it is possible to form an easily deformable portion. Therefore, in response to misalignment between the H-shaped steel beams 200, the flat portion 14 can be deformed, thereby suppressing the influence of the misalignment.

[0053] 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.

[0054] 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.

[0055] [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.

[0056] In the second embodiment, the grooved joint plate 100 is not used alone but is used together with a clamping member 120. As shown in FIG. 5(a), the protrusions 13 and grooves 11 are formed on only one surface of the grooved joint plate 100, and the clamping member 120 is fixed to the other surface. 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.

[0057] In the example shown in Fig. 5(a), the grooved joint plate 100 and the clamping member 120 are joined by a welded portion 121. Alternatively, as shown in Fig. 5(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.

[0058] 6 is a cross-sectional view showing a steel joint structure 300a using a clamping member 120. Note that, although an example is shown in which the clamping member 120 and the grooved joint plate 100 are joined with bolts 123, they may also be joined by welding.

[0059] A pair of H-shaped steels 200 are arranged so that their ends butt against each other, and a grooved joint plate 100 and a clamping member 120 of approximately the same size are placed and fixed across the H-shaped steels 200. At this time, the multiple protrusions 13 and grooves 11 of the grooved joint plate 100 are placed facing the H-shaped steel 200, and the H-shaped steel 200 is sandwiched between the grooved joint plate 100 and the clamping member 120. In other words, the grooved joint plate 100 is placed between the clamping member 120 and the H-shaped steel 200, and the H-shaped steel 200 and the grooved joint plate 100 are sandwiched by the clamping member 120.

[0060] 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.

[0061] According to the second embodiment, the same effects as those of the first embodiment can be obtained. Furthermore, by using the clamping members 120 and ensuring the total thickness of the two clamping members 120 that sandwich the steel material and the two grooved joint plates 100, rigidity can be obtained by the clamping members 120 even if the thickness of the grooved joint plate 100 is reduced. In this way, by thinning the grooved joint plate 100 that undergoes groove processing, etc., processing becomes easier.

[0062] [Third embodiment] Next, a third embodiment will be described. Fig. 7(a) is a cross-sectional view showing a grooved joint plate 100a according to the third embodiment. The grooved joint plate 100a has substantially the same configuration as the grooved joint plate 100, but differs in that protrusions 13 and grooves 11 are formed on both sides.

[0063] 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. 7(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. 7(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 and width ratios of the projections 13 and grooves 11 described above on at least one side, it is preferable that the height and width ratios of the projections 13 and grooves 11 on both sides be satisfied. The flat portion 14 may be formed on one side, but may also be formed on both sides.

[0064] 8 is a diagram showing a steel joint structure 300b using a grooved joint plate 100a. In the steel joint structure 300b, similar to the steel joint structure 300a, the grooved joint plate 100a and the H-shaped steel 200 are sandwiched between clamping members 120 and fixed with high-strength bolts 101 and nuts 102. In this case, the clamping members 120 and the grooved joint plate 100a are not joined by welding or bolts, but rather the protrusions 13 of the grooved joint plate 100a bite into the clamping members 120, preventing misalignment between them and fixing them together. That is, the grooved joint plate 100a has a plurality of protrusions 13 and grooves 11 formed between the protrusions 13 on each of the surfaces facing the H-shaped steel 200 and the clamping member 120, and the protrusions 13 on the outer surface of the grooved joint plate 100a bite into the clamping member 120, while the protrusions 13 on the inner surface of the grooved joint plate 100a bite into the H-shaped steel 200. Note that a flat portion 14 is formed on the surface of the grooved joint plate 100a facing the H-shaped steel 200, but the flat portion 14 is not necessarily required on the surface facing the clamping member 120. Furthermore, to improve work efficiency, the grooved joint plate 100a and the clamping member 120 may be temporarily joined with bolts or the like.

[0065] 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.

[0066] According to the third embodiment, the same effects as those of the second 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.

[0067] [Fourth embodiment] Next, a fourth embodiment will be described. Fig. 9 is a perspective view showing a grooved joint plate 100b according to the fourth 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.

[0068] 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. In the illustrated example, the grooves 11a and 11b are arranged perpendicular to each other, but the angle between the grooves 11a and 11b is not limited to 90 degrees. In the illustrated example, the protrusions 13 and the grooves 11a and 11b are formed on only one surface, but they may be formed on both surfaces. In the grooved joining plate 100b, it is sufficient that the height ratio and width ratio between the protrusion 13 and the groove 11 described above are satisfied in at least one of the grooves 11a and 11b, but it is desirable that the height ratio and width ratio between the protrusion 13 and the groove 11 described above be satisfied in both the grooves 11a and 11b.

[0069] According to the fourth 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.

[0070] 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 direction in which the grooves and protrusions are formed for joining the web and the flange, and the same members can be used. The grooved joining plate 100b can be used alone or in combination with the clamping member 120.

[0071] 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]

[0072] 11, 11a, 11b……Groove 12...Through hole 13....Protrusion 14……Flat area 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, 300b……Steel joint structure

Claims

1. A grooved joining plate that is arranged so as to straddle a pair of steel materials to be joined, whose ends are butted against each other, and is fixed so as to sandwich the steel materials, and joins the steel materials together, On at least one surface of the grooved joining plate, a plurality of protrusions for biting into the steel material are arranged in parallel and in a direction in which the steel material faces each other, and a plurality of grooves are arranged in parallel between the protrusions, In the direction of the protrusions, in a predetermined range at approximately the center of the width direction of the grooved joint plate, a flat portion where the protrusions and the grooves are not formed is formed parallel to the protrusions so as to be located near the butt joint between the steel materials, The thickness of the grooved joining plate at the flat portion is thinner than the thickness of the grooved joining plate at the groove portion, The grooved joint plate is characterized in that the flat portion has lower rigidity than other portions and serves as an easily deformable portion of the grooved joint plate.

2. A plurality of other protrusions are arranged parallel to the protrusions on the other surface of the grooved joining plate, and a plurality of other grooves are arranged parallel to the other protrusions, 2. The grooved joint plate according to claim 1, wherein the flat portion is formed on only one surface of the grooved joint plate.

3. 3. The grooved joint plate according to claim 2, wherein the pitch between the protrusions is different from the pitch between the other protrusions on each surface of the grooved joint plate.

4. A pair of steel members whose ends are butted together; A grooved joint plate that is fixed so as to straddle the steel materials and sandwiches the steel materials; Equipped with The grooved joining plate is At least on the surface facing the steel material, a plurality of protrusions are arranged in parallel, and a plurality of grooves are arranged in parallel between the protrusions, and the width direction of the grooved joining plate is the facing direction of the steel material, At least in a predetermined range in the substantially central portion of the width direction of the grooved joint plate on the surface facing the steel material, a flat portion in which the protrusion and the groove are not formed is formed parallel to the protrusion, and the flat portion is arranged in the vicinity of the butt portion between the steel materials, The thickness of the grooved joining plate at the flat portion is thinner than the thickness of the grooved joining plate at the groove portion, A steel material joining structure, characterized in that the flat portion is deformable so as to absorb misalignment of the steel material.

5. A clamping member is provided that is fixed so as to straddle the steel materials and clamps the steel materials and the grooved joining plate, A steel material joining structure as described in claim 4, characterized in that the protrusion and the groove are formed only on the surface of the grooved joining plate facing the steel material, and the clamping member and the grooved joining plate are fixed by welding or bolts.

6. A clamping member is provided that is arranged so as to straddle the steel materials and clamps the steel materials and the grooved joining plate, The grooved joint plate has a plurality of protrusions and grooves formed between the protrusions on each of the surfaces facing the steel material and the clamping member, and the flat portion is formed only on the surface of the grooved joint plate facing the steel material.A steel joint structure as described in claim 4, characterized in that

7. 7. The steel joint structure according to claim 6, wherein the pitch between the protrusions is different on each surface of the grooved joint plate.

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