Joint structure of H-shaped steel with projections

Abstract

To provide a joint structure that solves problems such as processing labor for removing protrusions and an increase in the number of bolts when connecting H-section steel with protrusions in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of a flange.SOLUTION: An outer attachment plate 7 and inner attachment plates 8 and 8 are provided on outer and inner surfaces of flanges 3 and 5, respectively, so as to straddle joint ends 2a of H-section steel 2 with protrusions. At a mating surface of the outer attachment plate 7 to the outer surface of the flange, a protrusion 11 is formed with a concave-convex pattern having a convex part 11a that comes into contact with a concave part 6c on the flanges 3 and 5 side, and a concave part 11b that comes into contact with convex parts 6a and 6b on the flange side. The outer attachment plate 7, the flange 3 (5), and the inner attachment plate 8 are integrally fastened with a plurality of high-strength bolts 9 and nuts 10.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a joint structure for connecting H-shaped steel beams with projections formed on the outer surfaces of the flanges in a predetermined concave-convex pattern. [Background technology]

[0002] BACKGROUND ART In a conventional steel-concrete composite structure, when an H-shaped steel is used as a core material, protrusions are provided on the surface of the H-shaped steel to improve adhesion to the surrounding concrete.

[0003] For example, Patent Document 1 listed below discloses an H-shaped steel beam with protrusions provided on the outer surface of the flange and on both sides of the web, Patent Document 2 listed below discloses an H-shaped steel beam with multiple protrusions on the inner surface of the flange, and Patent Document 3 listed below discloses an H-shaped steel beam with multiple protrusions on the outer surface of the flange. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-4494 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-300913 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-278048 Summary of the Invention [Problem to be solved by the invention]

[0005] The H-shaped steel beams described in Patent Documents 1 to 3 above have multiple protrusions on the outer surface of the flange, both sides of the web, or the inner surface of the flange, which increases the shear strength between the protrusions formed on the H-shaped steel beam and the concrete, thereby achieving sufficient adhesion between the steel material and the concrete.

[0006] Conventionally, the joint structure for connecting H-shaped steel beams has been to provide splice plates on both sides of the flanges and / or webs, and fasten these splice plates and H-shaped steel beams together with high-strength bolts and nuts. However, when H-shaped steel beams with protrusions are used, the contact between the splice plates and the H-shaped steel beams is limited to the tip surfaces of the protrusions, which reduces the friction between the H-shaped steel beams and the splice plates. Therefore, it has been common to increase the friction by taking measures such as (1) removing the protrusions in the area where the splice plates are to be attached to make the outer surface of the H-shaped steel flat, or (2) making the splice plates larger than usual to increase the contact area between the splice plates and the tip of the protrusions, and increasing the number of high-strength bolts to increase the tightening force.

[0007] However, the above measure (1) had the problem that it was time-consuming to process the H-shaped steel to remove the protrusions, and the above measure (2) had the problem that it required a large number of high-strength bolts to be tightened, making the work on site time-consuming.

[0008] Therefore, the object of the present invention is to provide a joint structure that eliminates problems such as the processing effort required to remove the protrusions and the increased number of bolts when connecting H-shaped steel beams with protrusions formed in a predetermined uneven pattern on at least the outer surface of the flange. [Means for solving the problem]

[0009] above Record In order to solve the above problem, the present invention according to claim 1 provides a joint structure for longitudinally connecting H-shaped steel beams with projections formed in a predetermined uneven pattern on at least the outer surface of the flange, the protruding H-shaped steel beam is a striped H-shaped steel beam, and the uneven pattern of the protrusions is a regular lattice frame-like uneven pattern in which protruding stripes are formed along the longitudinal direction of the member at predetermined intervals in the width direction, and protruding stripes are formed along the width direction of the member at intervals in the longitudinal direction, and square-shaped recesses are formed in areas surrounded by the protruding stripes along the longitudinal direction of the member and the protruding stripes along the width direction of the member, An outer surface splice plate and an inner surface splice plate are respectively disposed on the outer surface and the inner surface of the flange so as to straddle the joint ends of the protruding H-shaped steel beams, and protrusions are formed on the mating surface of the outer surface splice plate with the outer surface of the flange in an uneven pattern having convex portions that abut against concave portions on the flange side and concave portions that abut against convex portions on the flange side, The outer surface side splice plate, the flange and the inner surface side splice plate are fastened together with a plurality of high strength bolts and nuts. The high-strength bolt is disposed at a central position within the recess of the flange.The present invention provides a joint structure for H-shaped steel beams with projections, characterized by the above.

[0010] In the invention described in claim 1, the protruding H-shaped steel is Among the various types of H-shaped steel beams with protrusions available on the market, we decided to use H-shaped steel beams with protrusions called "striped H-shaped steel beams." are. The checkered H-section steel is mainly used as a road surface covering plate, and has multiple projections on the outer surface of the flange for anti-slip purposes. The flange outer surface of this checkered H-section steel has projections formed in advance in a predetermined uneven pattern, so the adhesion performance between the steel material and concrete can be improved without the need for additional processing to form the projections. The uneven pattern of the protrusions is such that protrusions are formed along the longitudinal direction of the member at predetermined intervals in the width direction, and protrusions are formed along the width direction of the member at intervals in the longitudinal direction, and square recesses are formed in the area surrounded by the protrusions along the longitudinal direction of the member and the protrusions along the width direction of the member. Regular lattice frame unevenness This is to use a pattern.

[0011] The aforementioned When connecting H-beams with protrusions, the outer splice plate, which is placed on the outer surface of the flange, has protrusions formed on its mating surface with a concave-convex pattern, with protrusions that abut against the concave portions of the flange and concave portions that abut against the convex portions of the flange. Therefore, when a flat splice plate is used, frictional force only acts on the tip surfaces of the flange convex portions. However, in the present invention, the protrusions are formed in a concave-convex pattern, with protrusions that abut against the concave portions of the flange and concave portions that abut against the convex portions of the flange. This increases the contact area and ensures a strong frictional force. This eliminates the need to process the H-beam to remove the protrusions and also eliminates the need to increase the number of bolts.

[0012] Furthermore, when the outer surface side splice plate, flange, and inner surface side splice plate are fastened together with a plurality of high-strength bolts and nuts, the high-strength bolts are positioned at the center of the recess in the flange. If the high-strength bolts were positioned in a range spanning the ridge and the recess, it would be undesirable because it would be difficult to tighten uniformly due to differences in thickness and rigidity caused by manufacturing errors, etc.

[0013] The present invention according to claim 2 provides a joint structure for a protruding H-shaped steel beam according to claim 1, in which protrusions are formed on the mating surface of the outer surface splice plate with the outer surface of the flange in a concave-convex pattern that is the exact opposite of the concave-convex pattern on the outer surface of the flange.

[0014] The invention described in claim 2 above shows a first example of the concave-convex pattern of the protrusions formed on the mating surface of the outer adhesive plate with the outer surface of the flange. This first example aims for a contact area ratio of 100% (contact area / flat area of ​​the outer adhesive plate), and is an example of an embodiment in which the protrusions are formed with a concave-convex pattern that is the exact opposite of the concave-convex pattern on the outer surface of the flange, thereby ensuring complete adhesion over the entire area of ​​the outer adhesive plate.

[0015] The present invention according to claim 3 provides a joint structure for H-shaped steel beams with projections according to claim 1, wherein the uneven pattern of the projections formed on the outer surface of the flange is an uneven shape with inclined surfaces for rubbing at the boundaries between the concave and convex portions, and the mating surface of the outer surface attachment plate that fits onto the outer surface of the flange is formed with protrusions in an uneven pattern having convex portions that abut against concave portions on the flange side and concave portions that abut against convex portions on the flange side, in an area excluding the portion that corresponds to the inclined surfaces for rubbing.

[0016] The invention described in claim 3 above shows a second example of the concave-convex pattern of protrusions formed on the mating surface of the outer flange splice plate. This second example is an embodiment in which the flange's concave-convex pattern does not adhere to the portions of the flange that correspond to the inclined rubbing surfaces. Specifically, if the concave-convex pattern of protrusions formed on the outer flange surface is an uneven shape in which inclined rubbing surfaces are formed at the boundaries between the concave and convex portions, and if the inclined rubbing surfaces are to be adhered to the flanges as well, cutting the portions that correspond to the inclined rubbing surfaces would require a lot of work. Therefore, the portions that correspond to the inclined rubbing surfaces are not adhered to the flanges, and the convex and concave portions are adhered to each other in other areas. Even in such a case, it is possible to ensure a contact area ratio (contact area / planar area of ​​the outer splice plate) of approximately 80% to 85%.

[0017] Claim 4 The present invention provides a joint structure for a protruding H-shaped steel beam as described in claim 1, in which the inner surface of the flange is a flat surface without protrusions, and the mating surface of the inner surface side splice plate with the inner surface of the flange is also a flat surface without protrusions.

[0018] The above claims 4 The described invention specifically defines the shape of the inner flange surface and the shape of the inner flange splice plate. Although there are H-shaped steel beams on the market that have protrusions on the inner flange surface in a concave-convex pattern, in this invention, taking into consideration the effort required to process the splice plate and the adhesive strength with the concrete, it is desirable that the inner flange surface be flat and free of protrusions, and that the mating surface of the inner flange splice plate also be flat and free of protrusions. [Effects of the Invention]

[0019] As described above in detail, according to the present invention, when connecting H-shaped steel beams with protrusions formed in a predetermined uneven pattern on at least the outer surface of the flanges, it is possible to eliminate problems such as the processing effort required to remove the protrusions and an increase in the number of bolts. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view of a wall showing a steel concrete composite structure 1 in which a protruding H-shaped steel 2 is used as a core material (tensile material). [Figure 2] FIG. 2 is a perspective view of the end of the striped H-beam steel 2. [Figure 3] 3 is a cross-sectional view of the uneven portion of the checkered H-shaped steel 2 (a view taken along the line III-III in FIG. 2). [Figure 4] 4 is a cross-sectional view of the checkered H-shaped steel 2 at the protrusion 6b (a view taken along the line IV-IV in FIG. 2). [Figure 5] 1A and 1B show the method of connecting the checkered H-shaped steel 2, where (A) is an exploded vertical cross-sectional view and (B) is a vertical cross-sectional view in a connected state. [Figure 6] 1A and 1B show the method of connecting the checkered H-shaped steel 2, where (A) is an exploded cross-sectional view and (B) is a cross-sectional view in a connected state. [Figure 7] 1 shows an outer surface side splice plate 7, (A) is a plan view, and (B) is a cross-sectional view (view along the arrow BB). [Figure 8] 10 shows a second embodiment of an outer surface side splice plate 7', in which (A) is a plan view and (B) is a cross-sectional view (view taken along the arrow BB). [Figure 9] FIG. 10 is a cross-sectional view of the essential part showing the state in which an outer surface splice plate 7' is installed on the outer surface of the flange. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0022] In a steel-concrete composite structure 1, as shown in Figure 1, protruding H-shaped steel beams 2, 2... with protrusions 6 formed in a predetermined uneven pattern on the outer surface of the flanges may be used as core materials (tensile materials).

[0023] As shown in the figure, the protruding H-shaped steels 2, 2... are arranged in parallel, mainly in the tension side area. That is, it is preferable to arrange them so that the flanges 3, 5 face the wall surface of the wall, and space them apart so that the webs 4, 4 of adjacent striped H-shaped steels 2, 2 face each other. In particular, the use of protruding H-shaped steels 2, 2... enhances the shear strength between the protrusions and the concrete, thereby ensuring sufficient adhesion between the steel material and the concrete. Note that while Figure 1 shows a wall made of a steel-concrete composite structure, it goes without saying that the present invention can also be applied to other steel-concrete composite structures. In addition to the protruding H-shaped steels 2, reinforcing bars or the like may be placed as needed.

[0024] There are several types of protruding H-shaped steel 2 available on the market, but this embodiment will specifically describe an example using a protruding H-shaped steel called a "checkered H-shaped steel." The checkered H-shaped steel 2 has been used primarily as road surface covering plates, and has protrusions 6 formed on the outer surfaces of the upper and lower flanges 3, 5 by hot rolling in a predetermined uneven pattern to prevent slipping. No such protrusions are provided on the surfaces other than the outer surfaces of the flanges 3, 5, i.e., the inner surfaces of the flanges 3, 5 and both surfaces of the web 4, and these surfaces are flat.

[0025] The protrusions 6 may have a variety of concave-convex patterns depending on the type of checkered H-shaped steel. Any of these patterns may be used. However, as shown in FIG. 2, it is preferable to use protrusions 6 formed in a regular lattice-like pattern along the axial and width directions of the checkered H-shaped steel 2. The regular lattice-like pattern refers to a plurality of protrusions 6, each consisting of ridges 6a, 6b extending linearly along the axial and width directions of the checkered H-shaped steel 2, spaced apart in the width and axial directions. Specifically, as shown in FIG. 2, multiple ridges 6a, 6a... are formed along the longitudinal direction of the member at a predetermined interval in the width direction (five in the illustrated example), and ridges 6b, 6b... are formed along the longitudinal direction of the member at a predetermined interval in the width direction. A recess 6c formed in the area surrounded by the ridges 6a and 6b is square-shaped. A rubbing inclined surface 6d is formed at the boundary between the periphery of this square recess 6c and the ridges 6a, 6b.

[0026] By using a regular lattice frame-like pattern as the unevenness pattern of the protrusions 6, stronger adhesion to the concrete 3 can be obtained against the shear forces acting in the axial and width directions of the striped H-shaped steel 2, and the adhesion performance to the concrete 3 can be improved.

[0027] As for the height and shape of the protrusions 6, in terms of those generally available on the market, the width dimension (B) of the intermediate protrusions 6a among the ridges 6a is 10 mm, the width dimension (D) of the end protrusions 6a is 12 mm, the width (A) of the intermediate recesses 6c is 32 mm, and the width (C) of the end recesses 6c is 31.5 mm, as shown in Figure 3. The heights (e) and (f) of the rubbing inclined portions 6d are each 2 mm.

[0028] The protrusions 6 are formed over the entire outer surfaces of the flanges 3 and 5, that is, over the entire width and axial lengths of the outer surfaces of the flanges 3 and 5.

[0029] The protrusions 6 are provided only on the outer surfaces of the flanges 3, 5, and are not formed on the inner surfaces of the flanges 3, 5. In other words, other than the protrusions 6 formed on the outer surfaces of the flanges 3, 5 of the prefabricated checkered H-section steel 2, no protrusions are provided on the inner surfaces of the flanges 3, 5, and the inner surfaces of the flanges are flat.

[0030] By using checkered H-beams 2 with protrusions 6 in a predetermined uneven pattern formed on the outer surfaces of the flanges 3 and 5 as the core material of the steel-concrete composite structure 1, it is possible to improve the adhesion between the steel material and concrete without the need for additional processing to provide protrusions to improve adhesion to the concrete. In addition, the checkered H-beams are a general-purpose product and can be obtained inexpensively.

[0031] [Joint structure] Next, a joint structure for connecting the H-section steel beams 2, 2 used in the steel-concrete composite structure 1 in the longitudinal direction of the members will be described.

[0032] 5 and 6, an outer surface splice plate 7 and an inner surface splice plates 8, 8 are disposed on the outer and inner surfaces of the upper and lower flanges 3, 5, respectively, so as to straddle the joint ends 2a where the checkered H-section steels 2, 2 are butted together. The outer surface splice plate 7 is formed from a single plate material with the same width as the flanges 3, 5, and the inner surface splice plates 8, 8 are formed from a total of two plate materials, one on each side, straddling the web 4.

[0033] In particular, in the present invention, on the mating surface of the outer surface of the flange of the outer surface joining plate 7 disposed on the outer surface side of the upper and lower flanges 3, 5 on which the protrusions 6 are formed, as shown in Fig. 7, protrusions 11 are formed in an uneven pattern having protrusions 11a that abut against recesses 6c on the flanges 3, 5 and recesses 11b that abut against protrusions 6a, 6b on the flanges. That is, at all locations of the ridges 6a, 6b, recesses 6c, 6c... formed on the outer surfaces of the flanges 3, 5, and the rubbing inclined surface 6d, the flanges 3, 5 and the outer surface joining plate 7 come into contact with each other, the protrusions 11 are formed in an uneven pattern with protrusions 11a, 11a... formed in a regular arrangement and recesses 11b, 11b... formed in a lattice frame shape between the protrusions 11a and the protrusions 11a so as to form an uneven pattern that is the exact opposite of the uneven pattern on the outer surfaces of the flanges 3, 5.

[0034] As a result, the contact area ratio (contact area / flat area of ​​outer splice plate) between the outer surfaces of the flanges 3 and 5 and the outer splice plate 7 can theoretically be made 100%, ensuring sufficient frictional force for the friction joint of the high-strength bolts. However, if a normal flat outer splice plate were used, only the tip surfaces of the protrusions 6a and 6b on the outer surfaces of the flanges of the checkered H-section steel 2 would come into contact, so a contact area ratio of only about 45% could be ensured.

[0035] As shown in FIG. 7, the concave-convex pattern of the outer surface splice plate 7 is formed in the same pattern in both the longitudinal and width directions. Therefore, the joint end 2a of the checkered H-shaped steel 2 should be defined as a position that crosses the center of the recess 6c on the outer surface of the flange or a position that crosses the center of the width of the ridge 6b that extends along the width direction of the member, so that the concave-convex pattern formed on the outer surface of the flange continues at the joint end 2a with the same concave-convex pattern.

[0036] For example, if the end of one of the striped H-shaped steel beams 2 is located at a position shifted longitudinally from the center point of the recess 6c on the outer surface of the flange, the amount of shift from the center point of the recess 6c on the other striped H-shaped steel beam 2 can be adjusted so that the shape of the recess 6c spanning the joint end 2a is the same as the other, thereby making it possible to continue with the same uneven pattern.

[0037] The concave-convex pattern of the outer splice plate 7 is preferably imparted by hot rolling during the production of the steel plate, but it is also possible to form the concave-convex pattern by cutting a steel plate of the same thickness.

[0038] On the other hand, as the inner plate materials 8, 8, ordinary steel plates having flat front and back surfaces are used.

[0039] As shown in Figures 5 and 6, the checkered H-section steel beams 2, 2 are connected longitudinally with their end faces butted together. An outer splice plate 7 is placed on the outer side of the flanges 3, 5 so that the recesses fit together, and an inner splice plate 8, 8 is placed on the inner side of the flanges 3, 5. High-strength bolts 9, 9... are inserted through the outer splice plate 7, flanges 3 (5), and inner splice plate 8, and fastened by screwing nuts 10 on the opposite sides to secure the beams together. The high-strength bolts 9 are preferably positioned centrally within the recesses 6c of the flanges 3, 5. Placing the high-strength bolts 9 between the ridges 6a, 6b and the recesses 6c is undesirable because it could result in uneven tightening due to differences in thickness and rigidity caused by manufacturing errors.

[0040] [Second embodiment] In the first embodiment, in order to make the contact area ratio between the outer surfaces of the flanges 3 and 5 and the outer surface joining plate 7 100%, the surface of the outer surface joining plate 7 that comes into contact with the outer surface of the flanges is structured so that protrusions 11 are formed in an uneven pattern that is the exact opposite of the uneven pattern on the outer surfaces of the flanges 3 and 5. However, when the uneven pattern of the outer surface joining plate 7 is produced by cutting, it is quite a time-consuming task to form the pattern by cutting, including the inclined surface that corresponds to the rubbing inclined surface 6d formed around the periphery of the recess 6c of the flanges 3 and 5 and at the boundary between the ridges 6a and 6b.

[0041] In order to reduce the labor required for this processing, the mating surface of the outer surface attachment plate 7 that comes into contact with the outer surface of the flange is shaped so that protrusions 12 are formed in an uneven pattern having convex portions 12a that come into contact with concave portions 6c on the flange side and concave portions 12b that come into contact with convex portions 6a, 6b on the flange side, in the area excluding the rubbing inclined surface portion 6d.

[0042] Specifically, as shown in Fig. 8, recesses 12b, 12b... are formed in the outer surface side joining plate 7' in the area corresponding to the range including the ridges 6a, 6b of the flange 3 (5) and the rubbing inclined surface 6d, and protrusions 12a, 12a... that come into contact with the recess 6c of the flange 3 (5) form unevenness. The side surface of the protrusion 12a stands upright perpendicular to the base surface, that is, the protrusion 12a is a protrusion that protrudes in the shape of a rectangular pillar.

[0043] 9, when the outer contact plate 7 is installed on the outer surface of the flange 3, the flange 3 and the outer contact plate 7 are not in contact within the area of ​​the inclined contact surface 6d plus α (surplus portion), and the protrusions 6a, 6b of the flange 3 are in contact with the recesses 12b of the outer contact plate 7', and the protrusions 12a of the outer contact plate 7' are in contact with the recesses 6c of the flange 3. Even when the recesses and protrusions of the flange 3 and the outer contact plate 7' are in contact with each other in the area excluding the inclined contact surface 6d of the flange 3 in this way, a contact area ratio of approximately 80 to 85% can be ensured, which is not as high as that of the first embodiment, but still ensures the required frictional force. [Explanation of symbols]

[0044] 1...steel concrete composite structure, 2...striped H-section steel, 3·5...flange, 4...web, 6...projection, 7·7'...outer surface splice plate, 11a·12a...convex portion, 11b·12b...concave portion, 8...inner surface splice plate, 9...bolt, 10...nut

Claims

1. A joint structure for connecting protruding H-shaped steel beams having protrusions formed in a predetermined uneven pattern on at least the outer surface of the flanges, the protruding H-shaped steel is a striped H-shaped steel, and the uneven pattern of the protrusions is a regular lattice frame-like uneven pattern in which protruding stripes are formed along the longitudinal direction of the member at predetermined intervals in the width direction, and protruding stripes are formed along the width direction of the member at intervals in the longitudinal direction, and square-shaped recesses are formed in areas surrounded by the protruding stripes along the longitudinal direction of the member and the protruding stripes along the width direction of the member, An outer surface splice plate and an inner surface splice plate are respectively disposed on the outer surface and the inner surface of the flange so as to straddle the joint ends of the protruding H-shaped steel beams, and protrusions are formed on the mating surface of the outer surface splice plate with the outer surface of the flange in an uneven pattern having convex portions that abut against concave portions on the flange side and concave portions that abut against convex portions on the flange side, A joint structure for a protruding H-shaped steel beam, characterized in that the outer surface side joint plate, flange, and inner surface side joint plate are fastened together with a plurality of high-strength bolts and nuts, and the high-strength bolts are positioned at intermediate positions within the recesses of the flanges.

2. 2. A joint structure for a protruding H-shaped steel beam as described in claim 1, wherein the mating surface of the outer surface splice plate to the outer surface of the flange has protrusions formed in a pattern of protrusions that is the exact opposite of the pattern of protrusions on the outer surface of the flange.

3. 2. A joint structure of a protruding H-section steel as claimed in claim 1, wherein the uneven pattern of the protrusions formed on the outer surface of the flange is an uneven shape with inclined surfaces for rubbing at the boundaries between the concave and convex portions, and the mating surface of the outer surface attachment plate that fits onto the outer surface of the flange is formed with protrusions in an uneven pattern having convex portions that abut against the concave portions on the flange side and concave portions that abut against the convex portions on the flange side, in an area excluding the portion that corresponds to the inclined surfaces for rubbing.

4. 2. A joint structure for H-shaped steel beams with projections according to claim 1, wherein the inner surface of the flange is a flat surface without any projections, and the mating surface of the inner surface side splice plate with the inner flange surface is also a flat surface without any projections.

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