JP2023156703A - Joint structure of h-section steel with protrusion - Google Patents

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

The present invention relates to a joint structure for connecting protruded H-beams in which protrusions are formed in a predetermined uneven pattern on the outer surface of a flange.

BACKGROUND ART Conventionally, when an H-beam is used as a core material in a steel-concrete composite structure, a structure in which projections are provided on the surface of the H-beam in order to improve adhesion performance with surrounding concrete has been known.

For example, Patent Document 1 listed below discloses an H-beam steel with a projection provided with a plurality of projections on the outer surface of the flange and both surfaces of the web, and Patent Document 2 listed below discloses an H section steel with a plurality of projections provided on the inner surface of the flange. A shaped steel is disclosed, and furthermore, Patent Document 3 listed below discloses an H-shaped steel having a plurality of protrusions on the outer surface of a flange.

Japanese Patent Application Publication No. 2002-4494 Japanese Patent Application Publication No. 2004-300913 Japanese Patent Application Publication No. 2004-278048

The H-section steels described in Patent Documents 1 to 3 are provided with a plurality of protrusions on the outer surface of the flange, both sides of the web, or on the inner surface of the flange, thereby increasing the shear strength between the protrusions formed on the H-section steel and concrete. This allows sufficient adhesion to be achieved between the steel and concrete.

Conventionally, the joining structure for connecting H-beams is a structure in which splice plates are provided on each side of the flange and/or web, and these splice plates and H-beams are integrally fastened with high-strength bolts and nuts. However, if an H-beam with a protrusion is used, the contact between the H-beam and the H-beam is only at the tip of the protrusion, so the contact between the H-beam and the H-beam is There was a problem that the frictional force was reduced. For this reason, either (1) remove the protrusion in the area where the splice plate is attached to make the outer surface of the H-beam flat, or (2) make the splice plate larger than usual and make the connection between the splice plate and the tip of the protrusion. It has been common practice to increase the frictional force by increasing the contact area and taking measures such as increasing the number of high-strength bolts to increase the tightening force.

However, with the measure (1) above, there is a problem in that it takes time and effort to process the H-shaped steel to remove the protrusion, and with the measure (2) above, the number of high-strength bolts to be tightened increases, making it difficult to tighten on-site. There was a problem with the work being time consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint that eliminates problems such as the processing effort required to remove 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 the flange. It's about providing structure.

In order to solve the above-mentioned first problem, the present invention according to claim 1 provides a joint structure for longitudinally connecting a protruded H-shaped steel in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of a flange. There it is,
An outer side splicing plate and an inner side splicing plate are provided on the outer and inner surfaces of the flange, respectively, so as to straddle the joint ends of the H-beams with projections, and the flange of the outer side splicing plate On the mating surface to the outer surface, a protrusion is formed in a concave-convex pattern having a convex part that abuts the concave part on the flange side and a concave part that abuts the convex part on the flange side,
There is provided a joint structure for an H-shaped steel with a protrusion, characterized in that the outer side splicing plate, the flange, and the inner side splicing plate are integrally fastened with a plurality of high-strength bolts and nuts.

In the invention according to claim 1, when connecting the H-section steel with projections in which projections are formed in a predetermined uneven pattern on the outer surface of the flange, alignment of the outer side splicing plate disposed on the outer surface of the flange to the outer surface of the flange is performed. It is preferable to use one in which protrusions are formed on the surface in a concavo-convex pattern having convex portions that abut the concave portions on the flange side and concave portions that abut the convex portions on the flange side. Therefore, when a flat splice plate is used, the frictional force only works on the tip surface of the convex part on the flange side, but in the case of the present invention, the frictional force is applied to the concave part on the flange side. The protrusion is formed with an uneven pattern that has a convex part that comes into contact with the convex part and a concave part that comes into contact with the convex part on the flange side, so the contact area can be increased and the frictional force can be applied firmly. Become. Therefore, there is no need to process the H-shaped steel to remove the protrusion, and there is no need to increase the number of bolts.

The present invention according to claim 2 is characterized in that a projection is formed on the surface of the outer attachment plate that is mated to the outer surface of the flange in a pattern of protrusions and recesses that is the exact opposite of the pattern of protrusions and recesses that match the pattern of protrusions and recesses on the outer surface of the flange. A joint structure of a protruded H-beam according to item 1 is provided.

The invention as set forth in claim 2 provides a first embodiment of the uneven pattern of projections formed on the surface of the outer attachment plate that is mated to the outer surface of the flange. This first embodiment aims at a contact area ratio of 100% (contact area/plane area of the outer side splicing plate), and the protrusions are formed with an uneven pattern that is exactly opposite to the uneven pattern on the outer surface of the flange. This is an example of an embodiment in which the entire area of the outer attachment plate is brought into close contact with the outer attachment plate.

In the present invention according to claim 3, the uneven pattern of the protrusion formed on the outer surface of the flange is an uneven pattern in which an inclined surface for sliding is formed at the boundary between the recess and the protrusion, and the projection on the outer surface side The mating surface of the contact plate to the outer surface of the flange has a convex portion that abuts the concave portion on the flange side and a concave portion that abuts the convex portion on the flange side, excluding the portion corresponding to the sliding slope surface. There is provided a joint structure of a protruded H-section steel according to claim 1, wherein the protrusions are formed in a pattern of protrusions and recesses.

The invention according to claim 3 provides a second embodiment of the uneven pattern of the protrusions formed on the surface of the outer attachment plate that is mated to the outer surface of the flange. In this second embodiment, the portions of the uneven pattern of the flange that correspond to the sloped surface for sliding do not come into close contact. Specifically, when the uneven pattern of the protrusions formed on the outer surface of the flange has an uneven shape with a sliding slope formed at the boundary between the recess and the projection, the sliding slope If you are trying to make them adhere even to the surface, cutting the part corresponding to the slope for sliding will require more processing time, so the part corresponding to the slope for sliding will not be in close contact, and the other area will be cut. This is so that the uneven surfaces are brought into close contact with each other. Even in such a case, it is possible to maintain a contact area ratio (contact area/planar area of the outer attachment plate) of about 80% to 85%.

The present invention according to claim 4 is a claim in which the projection-equipped H-shaped steel is a striped H-shaped steel, and the projections formed on the outer surface of the flange have a regular lattice frame-like uneven pattern along the longitudinal direction and the width direction. A joint structure of a protruded H-section steel according to any one of items 1 to 3 is provided.

The invention according to claim 2 uses an H-section steel with projections called "striped H-section steel" among various H-section steels with projections sold on the market. Striped H-shaped steel is mainly used as a road surface lining plate, and has a plurality of anti-slip protrusions provided on the outer surface of the flange. The outer surface of the flange of this striped H-shaped steel is pre-formed with protrusions in a predetermined uneven pattern, so it is possible to improve the adhesion performance between the steel and concrete without the need for additional processing to provide the protrusions. . In addition, there are two types of unevenness patterns on the outer surface of the flange of striped H-shaped steel sold in the market: a regular grid frame-like protrusion pattern and a protrusion pattern in which circular protrusions are arranged in a staggered manner. This uses a lattice frame-like protrusion pattern.

The invention according to claim 5 is characterized in that the inner surface of the flange is a flat surface without any protrusions, and the surface of the inner side attachment plate that is mated to the inner surface of the flange is also a flat surface without any protrusions. A joint structure of a protruded H-section steel according to any one of items 1 to 4 is provided.

According to the third aspect of the present invention, the shape of the inner surface of the flange and the shape of the inner side attachment plate are specifically defined. Although there are H-beams on the market that have protrusions in an uneven pattern on the inner surface of the flange, the present invention takes into account the processing time of the splice plate and the adhesion strength with concrete. It is preferable that the inner surface of the flange is a flat surface without any protrusions, and the surface of the inner side splicing plate that is mated to the inner surface of the flange is also a flat surface without any protrusions.

As described in detail above, according to the present invention, problems such as the processing labor required to remove the protrusions and the increase in the number of bolts can be solved when connecting H-section steel with protrusions in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of the flange. It becomes possible to eliminate it.

FIG. 2 is a perspective view of a wall showing a steel-concrete composite structure 1 using an H-shaped steel 2 with projections as a core material (tensile material). FIG. 2 is a perspective view of the striped H-shaped steel 2 from the end side. FIG. 3 is a cross-sectional view of the striped H-shaped steel 2 at an uneven portion (a view taken along the line III-III in FIG. 2). FIG. 3 is a cross-sectional view of the striped H-shaped steel 2 at the protruding portion 6b (view taken along the line IV-IV in FIG. 2). (A) is an exploded longitudinal cross-sectional view, and (B) is a longitudinal cross-sectional view of the connected state, showing the connection method of the striped H-shaped steel 2. (A) is an exploded cross-sectional view, and (B) is a cross-sectional view in a connected state, showing how to connect the striped H-shaped steel 2. (A) is a plan view, and (B) is a cross-sectional view (view taken along the line B-B), showing the outer attachment plate 7. 7A is a plan view and FIG. 3B is a cross-sectional view (view taken along the line B-B), showing a second embodiment of the outer attachment plate 7'. FIG. 7 is a cross-sectional view of a main part showing a state in which the outer side attachment plate 7' is installed on the outer surface of the flange.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the steel-concrete composite structure 1, as shown in FIG. 1, H-beam steels 2, 2, etc. with protrusions, each having protrusions 6 formed in a predetermined uneven pattern on the outer surface of the flange, are used as core materials (tensile materials). Sometimes.

As shown in the figure, a plurality of the protruded H-beams 2, 2, . . . are arranged in parallel mainly in the tension side region. That is, it is preferable that the flanges 3 and 5 be arranged so as to face the wall surface of the wall, and that the webs 4 and 4 of the adjacent striped H-beams 2 and 2 be spaced apart from each other so as to face each other. In particular, by using the H-section steels 2, 2, etc. with protrusions, the shear strength between the protrusions and the concrete is increased, so that sufficient adhesive force can be obtained between the steel material and the concrete. Although FIG. 1 shows a wall with a steel-concrete composite structure, it goes without saying that it is applicable to other steel-concrete composite structures. In addition to the above-mentioned H-shaped steel 2 with projections, reinforcing bars or the like may be arranged as necessary.

Although multiple types of H-beam steel 2 with protrusions are provided on the market, in this embodiment, an example using an H-beam steel called "striped H-beam steel" will be described in detail. . The striped H-shaped steel 2 has conventionally been mainly used as a road lining plate, and projections 6 are formed on the outer surfaces of the upper and lower flanges 3 and 5 by hot rolling in a predetermined uneven pattern to prevent slipping. It is something that Other than the outer surfaces of the flanges 3 and 5, that is, the inner surfaces of the flanges 3 and 5 and both surfaces of the web 4 are not provided with such projections and are flat surfaces.

The uneven pattern of the protrusion 6 has a plurality of shapes depending on the type of striped H-beam steel, and any of the shapes may be used, but as shown in FIG. It is desirable to use one in which the protrusions 6 are formed in a pattern of protrusions and recesses in the shape of a regular lattice frame along the axial and width directions. The regular lattice frame shape is one in which a plurality of protrusions 6 consisting of protrusions 6a and 6b extending linearly along the axial and width directions of the striped H-shaped steel 2 are arranged at a distance in the width and axial directions, respectively. It is. Specifically, as shown in FIG. 2, a plurality of protrusions 6a, 6a, . Projections 6b, 6b, . . . are formed along the width direction of the member at intervals of . The recess 6c formed in the area surrounded by the protrusions 6a and 6b has a square shape. A sliding slope 6d is formed at the boundary between the square recess 6c and the protrusions 6a, 6b.

By using a regular lattice frame shape as the concavo-convex pattern of the protrusions 6, stronger adhesion to the concrete 3 can be obtained against shear forces acting in the axial and width directions of the striped H-beam 2. , the adhesion performance with concrete 3 can be improved.

The height and shape of the projections 6 are generally commercially available, and as shown in FIG. 3, the width dimension (B) of the intermediate projection 6a among the projections 6a. is 10 mm, the width dimension (D) of the protrusion 6a located at the end is 12 mm, the width (A) of the recess 6c located in the middle is 32 mm, and the width (C) of the recess 6c located at the end is 31.5 mm. It is. Further, the height (e) and height (f) of the sliding inclined portion 6d are each 2 mm.

The protrusion 6 is formed over the entire outer surface of the flanges 3 and 5, that is, the entire length of the outer surface of the flanges 3 and 5 in the width direction and axial direction.

The projections 6 are provided only on the outer surfaces of the flanges 3 and 5, and are not formed on the inner surfaces of the flanges 3 and 5. That is, other than the protrusions 6 on the outer surfaces of the flanges 3 and 5 formed on the ready-made striped H-shaped steel 2, no protrusions are provided on the inner surfaces of the flanges 3 and 5, and the inner surfaces of the flanges are flat surfaces.

As the core material of the steel-concrete composite structure 1, striped H-beam steel 2, in which protrusions 6 in a predetermined pattern of protrusions and recesses are formed in advance on the outer surfaces of the flanges 3 and 5, is used to improve adhesion performance with concrete. There is no need to perform a separate process to provide the steel, and the adhesion performance between the steel and concrete can be improved. Furthermore, the striped H-beam steel is a general-purpose product and can be obtained at low cost.

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

As shown in FIGS. 5 and 6, an outer joint plate 7 and an outer joint plate 7 are attached to the outer and inner surfaces of the upper and lower flanges 3, 5, respectively, so as to straddle the joint end 2a where the striped H-beams 2, 2 are butted together. Inner side attachment plates 8, 8 are provided. The outer attachment plate 7 is composed of a single plate having the same width as the flanges 3 and 5, and the inner attachment plates 8 and 8 have one plate on each side spanning the web 4. It is composed of two boards each.

In particular, in the present invention, as shown in FIG. 7, the flange 3, The protrusion 11 is formed in a concavo-convex pattern having a convex portion 11a that abuts the concave portion 6c on the flange side and a concave portion 11b that abuts the convex portions 6a and 6b on the flange side. In other words, the flanges 3, 5 and the outer attachment plate 7 are located at all parts of the protrusions 6a, 6b formed on the outer surfaces of the flanges 3, 5, the recesses 6c, 6c, and the sloped surface 6d for sliding. The convex parts 11a, 11a, . A protrusion 11 having a concavo-convex pattern is formed between the protrusion 11 and the concave portion 11b formed in the shape of a lattice frame.

As a result, the contact area ratio (contact area/plane area of the outer side splicing plate) between the outer surfaces of the flanges 3 and 5 and the outer side splicing plate 7 can be theoretically made 100%. This makes it possible to secure the frictional force of friction bonding. In addition, if a normal flat plate-shaped outer side attachment plate is used, only the tip surfaces of the protrusions 6a and 6b on the outer surface of the flange of the striped H-shaped steel 2 will come into contact, so the contact will be approximately 45%. Only the area ratio has been secured.

As shown in FIG. 7, the uneven pattern of the outer side joining plate 7 is formed in the same pattern in the longitudinal direction and the width direction, so that the joining end 2a of the striped H-shaped steel 2 is formed on the outer surface of the flange. The width of the protrusion 6b along the width direction of the member is set so that the concavo-convex pattern formed at the joint end 2a continues in the same concavo-convex pattern even at the joint end 2a position. It is preferable that the position crossing the center point be the end.

For example, in one striped H-shaped steel 2, when the end is located at a position shifted in the longitudinal direction from the center point of the recess 6c on the outer surface of the flange, the center point of the recess 6c on the other striped H-shaped steel 2 side By adjusting the amount of deviation from the joint end portion 2a and making the shape of the recessed portion 6c that straddles the joint end portion 2a the same as the other portions, it is possible to continue the same pattern of recesses and recesses.

It is preferable that the uneven pattern of the outer joint plate 7 is provided by hot rolling during manufacturing of the steel plate, but it is also possible to form the uneven pattern by cutting from a steel plate of the same thickness.

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

As shown in FIGS. 5 and 6, the striped H-beams 2 and 2 are connected by arranging the striped H-beams 2 and 2 longitudinally so that their end faces abut, and then connecting the flanges 3 and 5. The outer side splicing plate 7 is arranged on the outer side so that the concave and convex portions fit together, and the inner side splicing plates 8, 8 are arranged on the inner side of the flanges 3, 5, and the outer side splicing plate 7, High-strength bolts 9, 9, . . . are provided passing through the flange 3 (5) and the inner side attachment plate 8, and nuts 10 are screwed and fastened on the opposing sides to achieve integration. Here, it is desirable that the high-strength bolt 9 be placed at an intermediate position within the recesses 6c of the flanges 3 and 5. If it is arranged in a range spanning the protrusions 6a, 6b and the recess 6c, it is not preferable because it may not be able to be tightened uniformly due to differences in thickness or rigidity caused by manufacturing errors or the like.

[Second form example]
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 attachment plate 7 100%, the mating surface of the outer attachment plate 7 to the outer surface of the flange is The structure is such that the protrusion 11 is formed with a pattern of protrusions and recesses that is the exact opposite of the pattern of protrusions and recesses on the outer surfaces of the flanges 3 and 5 that matches. However, in the case where the uneven pattern of the b outer side splicing plate 7 is manufactured by cutting, the slanted surfaces for sliding are formed especially at the boundaries between the peripheries of the recesses 6c of the flanges 3 and 5 and the protrusions 6a and 6b. Forming by cutting, including the slope corresponding to 6d, requires considerable effort.

In order to save this processing effort, the mating surface of the outer attachment plate 7 to the outer surface of the flange has a convex portion that abuts the concave portion 6c on the flange side, excluding the sloped surface portion 6d for sliding. The protrusion 12 is formed in a concavo-convex pattern having a concave and convex pattern 12a and a concave portion 12b that abuts the convex portions 6a and 6b on the flange side.

Specifically, as shown in FIG. 8, in the outer attachment plate 7', a portion corresponding to a range including the protrusions 6a, 6b of the flange 3 (5) and the sloped surface 6d for sliding is formed into a recess. 12b, 12b, . . . , and convex portions 12a, 12a, . The side surface of the convex portion 12a has a shape that stands up perpendicularly to the base surface, that is, the convex portion 12a is a convex portion that protrudes in a prismatic shape.

As shown in FIG. 9, when the outer side attachment plate 7 is installed on the outer surface of the flange 3, the flange 3 and the outer side attachment plate 7, the protrusions 6a and 6b of the flange 3 come into contact with the recess 12b of the outer attachment plate 7', and the protrusion 12a of the outer attachment plate 7' contacts the recess 6c of the flange 3. They are in contact with each other. Even when the concave and convex portions of the flange 3 and the outer attachment plate 7' are brought into contact with each other within the range excluding the sliding slope 6d of the flange 3, the contact area ratio is approximately 80~ Approximately 85% of the frictional force can be secured, and although it is not as good as the first embodiment, it is possible to secure the required frictional force.

DESCRIPTION OF SYMBOLS 1... Steel-concrete composite structure, 2... Striped H-shaped steel, 3, 5... Flange, 4... Web, 6... Protrusion, 7, 7'... Outer side joint plate, 11a, 12a... Convex part, 11b, 12b... Recessed portion, 8...Inner side attachment plate, 9...Bolt, 10...Nut

The present invention relates to a joint structure for connecting protruded H-beams in which protrusions are formed in a predetermined uneven pattern on the outer surface of a flange.

BACKGROUND ART Conventionally, when an H-beam is used as a core material in a steel-concrete composite structure, a structure in which projections are provided on the surface of the H-beam in order to improve adhesion performance with surrounding concrete has been known.

For example, Patent Document 1 listed below discloses an H-beam steel with a projection provided with a plurality of projections on the outer surface of the flange and both surfaces of the web, and Patent Document 2 listed below discloses an H section steel with a plurality of projections provided on the inner surface of the flange. A shaped steel is disclosed, and furthermore, Patent Document 3 listed below discloses an H-shaped steel having a plurality of protrusions on the outer surface of a flange.

Japanese Patent Application Publication No. 2002-4494 Japanese Patent Application Publication No. 2004-300913 Japanese Patent Application Publication No. 2004-278048

The H-section steels described in Patent Documents 1 to 3 are provided with a plurality of protrusions on the outer surface of the flange, both sides of the web, or on the inner surface of the flange, thereby increasing the shear strength between the protrusions formed on the H-section steel and concrete. This allows sufficient adhesion to be achieved between the steel and concrete.

Conventionally, the joining structure for connecting H-beams is a structure in which splice plates are provided on each side of the flange and/or web, and these splice plates and H-beams are integrally fastened with high-strength bolts and nuts. However, if an H-beam with a protrusion is used, the contact between the H-beam and the H-beam is only at the tip of the protrusion, so the contact between the H-beam and the H-beam is There was a problem that the frictional force was reduced. For this reason, either (1) remove the protrusion in the area where the splice plate is attached to make the outer surface of the H-beam flat, or (2) make the splice plate larger than usual and make the connection between the splice plate and the tip of the protrusion. It has been common practice to increase the frictional force by increasing the contact area and taking measures such as increasing the number of high-strength bolts to increase the tightening force.

However, with the measure (1) above, there is a problem in that it takes time and effort to process the H-shaped steel to remove the protrusion, and with the measure (2) above, the number of high-strength bolts to be tightened increases, making it difficult to tighten on-site. There was a problem with the work being time consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint that eliminates problems such as the processing effort required to remove 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 the flange. It's about providing structure.

In order to solve the above-mentioned first problem, the present invention according to claim 1 provides a joint structure for longitudinally connecting a protruded H-shaped steel in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of a flange. There it is,
An outer side splicing plate and an inner side splicing plate are provided on the outer and inner surfaces of the flange, respectively, so as to straddle the joint ends of the H-beams with projections, and the flange of the outer side splicing plate On the mating surface to the outer surface, a protrusion is formed in a concave-convex pattern having a convex part that abuts the concave part on the flange side and a concave part that abuts the convex part on the flange side,
There is provided a joint structure for an H-shaped steel with a protrusion, characterized in that the outer side splicing plate, the flange, and the inner side splicing plate are integrally fastened with a plurality of high-strength bolts and nuts.

In the invention according to claim 1, when connecting the H-section steel with projections in which projections are formed in a predetermined uneven pattern on the outer surface of the flange, alignment of the outer side splicing plate disposed on the outer surface of the flange to the outer surface of the flange is performed. It is preferable to use one in which protrusions are formed on the surface in a concavo-convex pattern having convex portions that abut the concave portions on the flange side and concave portions that abut the convex portions on the flange side. Therefore, when a flat splice plate is used, the frictional force only works on the tip surface of the convex part on the flange side, but in the case of the present invention, the frictional force is applied to the concave part on the flange side. The protrusion is formed with an uneven pattern that has a convex part that comes into contact with the convex part and a concave part that comes into contact with the convex part on the flange side, so the contact area can be increased and the frictional force can be applied firmly. Become. Therefore, there is no need to process the H-shaped steel to remove the protrusion, and there is no need to increase the number of bolts.

The present invention according to claim 2 is characterized in that a projection is formed on the surface of the outer attachment plate that is mated to the outer surface of the flange in a pattern of protrusions and recesses that is the exact opposite of the pattern of protrusions and recesses that match the pattern of protrusions and recesses on the outer surface of the flange. A joint structure of a protruded H-beam according to item 1 is provided.

The invention as set forth in claim 2 provides a first embodiment of the uneven pattern of projections formed on the surface of the outer attachment plate that is mated to the outer surface of the flange. This first embodiment aims at a contact area ratio of 100% (contact area/plane area of the outer side splicing plate), and the protrusions are formed with an uneven pattern that is exactly opposite to the uneven pattern on the outer surface of the flange. This is an example of an embodiment in which the entire area of the outer attachment plate is brought into close contact with the outer attachment plate.

In the present invention according to claim 3, the uneven pattern of the protrusion formed on the outer surface of the flange is an uneven pattern in which an inclined surface for sliding is formed at the boundary between the recess and the protrusion, and the projection on the outer surface side The mating surface of the contact plate to the outer surface of the flange has a convex portion that abuts the concave portion on the flange side and a concave portion that abuts the convex portion on the flange side, excluding the portion corresponding to the sliding slope surface. There is provided a joint structure of a protruded H-section steel according to claim 1, wherein the protrusions are formed in a pattern of protrusions and recesses.

The invention according to claim 3 provides a second embodiment of the uneven pattern of the protrusions formed on the surface of the outer attachment plate that is mated to the outer surface of the flange. In this second embodiment, the portions of the uneven pattern of the flange that correspond to the sloped surface for sliding do not come into close contact. Specifically, when the uneven pattern of the protrusions formed on the outer surface of the flange has an uneven shape with a sliding slope formed at the boundary between the recess and the projection, the sliding slope If you are trying to make them adhere even to the surface, cutting the part corresponding to the slope for sliding will require more processing time, so the part corresponding to the slope for sliding will not be in close contact, and the other area will be cut. This is so that the uneven surfaces are brought into close contact with each other. Even in such a case, it is possible to maintain a contact area ratio (contact area/planar area of the outer attachment plate) of about 80% to 85%.

The present invention according to claim 4 is a claim in which the projection-equipped H-shaped steel is a striped H-shaped steel, and the projections formed on the outer surface of the flange have a regular lattice frame-like uneven pattern along the longitudinal direction and the width direction. A joint structure of a protruded H-beam according to Item 1 is provided.

The invention according to claim 4 uses an H-section steel with projections called "striped H-section steel" among various H-section steels with projections sold on the market. Striped H-shaped steel is mainly used as a road surface lining plate, and has a plurality of anti-slip protrusions provided on the outer surface of the flange. The outer surface of the flange of this striped H-shaped steel is pre-formed with protrusions in a predetermined uneven pattern, so it is possible to improve the adhesion performance between the steel and concrete without the need for additional processing to provide the protrusions. . In addition, there are two types of unevenness patterns on the outer surface of the flange of striped H-shaped steel sold in the market: a regular grid frame-like protrusion pattern and a protrusion pattern in which circular protrusions are arranged in a staggered manner. This uses a lattice frame-like protrusion pattern.

The invention according to claim 5 is characterized in that the inner surface of the flange is a flat surface without any protrusions, and the surface of the inner side attachment plate that is mated to the inner surface of the flange is also a flat surface without any protrusions. A joint structure of a protruded H-beam according to Item 1 is provided.

In the invention as set forth in claim 5 , the shape of the inner surface of the flange and the shape of the inner side splicing plate are specifically defined. Although there are H-beams on the market that have protrusions in an uneven pattern on the inner surface of the flange, the present invention takes into account the processing time of the splice plate and the adhesion strength with concrete. It is preferable that the inner surface of the flange is a flat surface without any protrusions, and the surface of the inner side splicing plate that is mated to the inner surface of the flange is also a flat surface without any protrusions.

As described in detail above, according to the present invention, problems such as the processing labor required to remove the protrusions and the increase in the number of bolts can be solved when connecting H-section steel with protrusions in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of the flange. It becomes possible to eliminate it.

FIG. 2 is a perspective view of a wall showing a steel-concrete composite structure 1 using an H-shaped steel 2 with projections as a core material (tensile material). FIG. 2 is a perspective view of the striped H-shaped steel 2 from the end side. FIG. 3 is a cross-sectional view of the striped H-shaped steel 2 at an uneven portion (a view taken along the line III-III in FIG. 2). FIG. 3 is a cross-sectional view of the striped H-shaped steel 2 at the protruding portion 6b (view taken along the line IV-IV in FIG. 2). (A) is an exploded longitudinal cross-sectional view, and (B) is a longitudinal cross-sectional view of the connected state, showing the connection method of the striped H-shaped steel 2. (A) is an exploded cross-sectional view, and (B) is a cross-sectional view in a connected state, showing how to connect the striped H-shaped steel 2. (A) is a plan view, and (B) is a cross-sectional view (view taken along the line B-B), showing the outer attachment plate 7. 7A is a plan view and FIG. 3B is a cross-sectional view (view taken along the line B-B), showing a second embodiment of the outer attachment plate 7'. FIG. 7 is a cross-sectional view of a main part showing a state in which the outer side attachment plate 7' is installed on the outer surface of the flange.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the steel-concrete composite structure 1, as shown in FIG. 1, H-beam steels 2, 2, etc. with protrusions, each having protrusions 6 formed in a predetermined uneven pattern on the outer surface of the flange, are used as core materials (tensile materials). Sometimes.

As shown in the figure, a plurality of the protruded H-beams 2, 2, . . . are arranged in parallel mainly in the tension side region. That is, it is preferable that the flanges 3 and 5 be arranged so as to face the wall surface of the wall, and that the webs 4 and 4 of the adjacent striped H-beams 2 and 2 be spaced apart from each other so as to face each other. In particular, by using the H-section steels 2, 2, etc. with protrusions, the shear strength between the protrusions and the concrete is increased, so that sufficient adhesive force can be obtained between the steel material and the concrete. Although FIG. 1 shows a wall with a steel-concrete composite structure, it goes without saying that it is applicable to other steel-concrete composite structures. In addition to the above-mentioned H-shaped steel 2 with projections, reinforcing bars or the like may be arranged as necessary.

Although multiple types of H-beam steel 2 with protrusions are provided on the market, in this embodiment, an example using an H-beam steel called "striped H-beam steel" will be described in detail. . The striped H-shaped steel 2 has conventionally been mainly used as a road lining plate, and projections 6 are formed on the outer surfaces of the upper and lower flanges 3 and 5 by hot rolling in a predetermined uneven pattern to prevent slipping. It is something that Other than the outer surfaces of the flanges 3 and 5, that is, the inner surfaces of the flanges 3 and 5 and both surfaces of the web 4 are not provided with such projections and are flat surfaces.

The uneven pattern of the protrusion 6 has a plurality of shapes depending on the type of striped H-beam steel, and any of the shapes may be used, but as shown in FIG. It is desirable to use one in which the protrusions 6 are formed in a pattern of protrusions and recesses in the shape of a regular lattice frame along the axial and width directions. The regular lattice frame shape is one in which a plurality of protrusions 6 consisting of protrusions 6a and 6b extending linearly along the axial and width directions of the striped H-shaped steel 2 are arranged at a distance in the width and axial directions, respectively. It is. Specifically, as shown in FIG. 2, a plurality of protrusions 6a, 6a, . Projections 6b, 6b, . . . are formed along the width direction of the member at intervals of . The recess 6c formed in the area surrounded by the protrusions 6a and 6b has a square shape. A sliding slope 6d is formed at the boundary between the square recess 6c and the protrusions 6a, 6b.

By using a regular lattice frame shape as the concavo-convex pattern of the protrusions 6, stronger adhesion to the concrete 3 can be obtained against shear forces acting in the axial and width directions of the striped H-beam 2. , the adhesion performance with concrete 3 can be improved.

The height and shape of the projections 6 are generally commercially available, and as shown in FIG. 3, the width dimension (B) of the intermediate projection 6a among the projections 6a. is 10 mm, the width dimension (D) of the protrusion 6a located at the end is 12 mm, the width (A) of the recess 6c located in the middle is 32 mm, and the width (C) of the recess 6c located at the end is 31.5 mm. It is. Further, the height (e) and height (f) of the sliding inclined portion 6d are each 2 mm.

The protrusion 6 is formed over the entire outer surface of the flanges 3 and 5, that is, the entire length of the outer surface of the flanges 3 and 5 in the width direction and axial direction.

The projections 6 are provided only on the outer surfaces of the flanges 3 and 5, and are not formed on the inner surfaces of the flanges 3 and 5. That is, other than the protrusions 6 on the outer surfaces of the flanges 3 and 5 formed on the ready-made striped H-shaped steel 2, no protrusions are provided on the inner surfaces of the flanges 3 and 5, and the inner surfaces of the flanges are flat surfaces.

As the core material of the steel-concrete composite structure 1, striped H-beam steel 2, in which protrusions 6 in a predetermined pattern of protrusions and recesses are formed in advance on the outer surfaces of the flanges 3 and 5, is used to improve adhesion performance with concrete. There is no need to perform a separate process to provide the steel, and the adhesion performance between the steel and concrete can be improved. Furthermore, the striped H-beam steel is a general-purpose product and can be obtained at low cost.

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

As shown in FIGS. 5 and 6, an outer joint plate 7 and an outer joint plate 7 are attached to the outer and inner surfaces of the upper and lower flanges 3, 5, respectively, so as to straddle the joint end 2a where the striped H-beams 2, 2 are butted together. Inner side attachment plates 8, 8 are provided. The outer attachment plate 7 is composed of a single plate having the same width as the flanges 3 and 5, and the inner attachment plates 8 and 8 have one plate on each side spanning the web 4. It is composed of two boards each.

In particular, in the present invention, as shown in FIG. 7, the flange 3, The protrusion 11 is formed in a concavo-convex pattern having a convex portion 11a that abuts the concave portion 6c on the flange side and a concave portion 11b that abuts the convex portions 6a and 6b on the flange side. In other words, the flanges 3, 5 and the outer attachment plate 7 are located at all parts of the protrusions 6a, 6b formed on the outer surfaces of the flanges 3, 5, the recesses 6c, 6c, and the sloped surface 6d for sliding. The convex parts 11a, 11a, . A protrusion 11 having a concavo-convex pattern is formed between the protrusion 11 and the concave portion 11b formed in the shape of a lattice frame.

As a result, the contact area ratio (contact area/plane area of the outer side splicing plate) between the outer surfaces of the flanges 3 and 5 and the outer side splicing plate 7 can be theoretically made 100%. This makes it possible to secure the frictional force of friction bonding. In addition, if a normal flat plate-shaped outer side attachment plate is used, only the tip surfaces of the protrusions 6a and 6b on the outer surface of the flange of the striped H-shaped steel 2 will come into contact, so the contact will be approximately 45%. Only the area ratio has been secured.

As shown in FIG. 7, the uneven pattern of the outer side joining plate 7 is formed in the same pattern in the longitudinal direction and the width direction, so that the joining end 2a of the striped H-shaped steel 2 is formed on the outer surface of the flange. The width of the protrusion 6b along the width direction of the member is set so that the concavo-convex pattern formed at the joint end 2a continues in the same concavo-convex pattern even at the joint end 2a position. It is preferable that the position crossing the center point be the end.

For example, in one striped H-shaped steel 2, when the end is located at a position shifted in the longitudinal direction from the center point of the recess 6c on the outer surface of the flange, the center point of the recess 6c on the other striped H-shaped steel 2 side By adjusting the amount of deviation from the joint end portion 2a and making the shape of the recessed portion 6c that straddles the joint end portion 2a the same as the other portions, it is possible to continue the same pattern of recesses and recesses.

It is preferable that the uneven pattern of the outer joint plate 7 is provided by hot rolling during manufacturing of the steel plate, but it is also possible to form the uneven pattern by cutting from a steel plate of the same thickness.

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

As shown in FIGS. 5 and 6, the striped H-beams 2 and 2 are connected by arranging the striped H-beams 2 and 2 longitudinally so that their end faces abut, and then connecting the flanges 3 and 5. The outer side splicing plate 7 is arranged on the outer side so that the concave and convex portions fit together, and the inner side splicing plates 8, 8 are arranged on the inner side of the flanges 3, 5, and the outer side splicing plate 7, High-strength bolts 9, 9, . . . are provided passing through the flange 3 (5) and the inner side attachment plate 8, and nuts 10 are screwed and fastened on the opposing sides to achieve integration. Here, it is desirable that the high-strength bolt 9 be placed at an intermediate position within the recesses 6c of the flanges 3 and 5. If it is arranged in a range spanning the protrusions 6a, 6b and the recess 6c, it is not preferable because it may not be able to be tightened uniformly due to differences in thickness or rigidity caused by manufacturing errors or the like.

[Second form example]
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 attachment plate 7 100%, the mating surface of the outer attachment plate 7 to the outer surface of the flange is The structure is such that the protrusion 11 is formed with a pattern of protrusions and recesses that is the exact opposite of the pattern of protrusions and recesses on the outer surfaces of the flanges 3 and 5 that matches. However, in the case where the uneven pattern of the b outer side splicing plate 7 is manufactured by cutting, the slanted surfaces for sliding are formed especially at the boundaries between the peripheries of the recesses 6c of the flanges 3 and 5 and the protrusions 6a and 6b. Forming by cutting, including the slope corresponding to 6d, requires considerable effort.

In order to save this processing effort, the mating surface of the outer attachment plate 7 to the outer surface of the flange has a convex portion that abuts the concave portion 6c on the flange side, excluding the sloped surface portion 6d for sliding. The protrusion 12 is formed in a concavo-convex pattern having a concave and convex pattern 12a and a concave portion 12b that abuts the convex portions 6a and 6b on the flange side.

Specifically, as shown in FIG. 8, in the outer attachment plate 7', a portion corresponding to a range including the protrusions 6a, 6b of the flange 3 (5) and the sloped surface 6d for sliding is formed into a recess. 12b, 12b, . . . , and convex portions 12a, 12a, . The side surface of the convex portion 12a has a shape that stands up perpendicularly to the base surface, that is, the convex portion 12a is a convex portion that protrudes in a prismatic shape.

As shown in FIG. 9, when the outer side attachment plate 7 is installed on the outer surface of the flange 3, the flange 3 and the outer side attachment plate 7, the protrusions 6a and 6b of the flange 3 come into contact with the recess 12b of the outer attachment plate 7', and the protrusion 12a of the outer attachment plate 7' contacts the recess 6c of the flange 3. They are in contact with each other. Even when the concave and convex portions of the flange 3 and the outer attachment plate 7' are brought into contact with each other within the range excluding the sliding slope 6d of the flange 3, the contact area ratio is approximately 80~ Approximately 85% of the frictional force can be secured, and although it is not as good as the first embodiment, it is possible to secure the required frictional force.

DESCRIPTION OF SYMBOLS 1... Steel-concrete composite structure, 2... Striped H-shaped steel, 3, 5... Flange, 4... Web, 6... Protrusion, 7, 7'... Outer side joint plate, 11a, 12a... Convex part, 11b, 12b... Recessed portion, 8...Inner side attachment plate, 9...Bolt, 10...Nut

The present invention relates to a joint structure for connecting protruded H-beams in which protrusions are formed in a predetermined uneven pattern on the outer surface of a flange.

BACKGROUND ART Conventionally, when an H-beam is used as a core material in a steel-concrete composite structure, a structure in which projections are provided on the surface of the H-beam in order to improve adhesion performance with surrounding concrete has been known.

For example, Patent Document 1 listed below discloses an H-beam steel with a projection provided with a plurality of projections on the outer surface of the flange and both surfaces of the web, and Patent Document 2 listed below discloses an H section steel with a plurality of projections provided on the inner surface of the flange. A shaped steel is disclosed, and furthermore, Patent Document 3 listed below discloses an H-shaped steel having a plurality of protrusions on the outer surface of a flange.

Japanese Patent Application Publication No. 2002-4494 Japanese Patent Application Publication No. 2004-300913 Japanese Patent Application Publication No. 2004-278048

The H-section steels described in Patent Documents 1 to 3 are provided with a plurality of protrusions on the outer surface of the flange, both sides of the web, or on the inner surface of the flange, thereby increasing the shear strength between the protrusions formed on the H-section steel and concrete. This allows sufficient adhesion to be achieved between the steel and concrete.

Conventionally, the joining structure for connecting H-beams is a structure in which splice plates are provided on each side of the flange and/or web, and these splice plates and H-beams are integrally fastened with high-strength bolts and nuts. However, if an H-beam with a protrusion is used, the contact between the H-beam and the H-beam is only at the tip of the protrusion, so the contact between the H-beam and the H-beam is There was a problem that the frictional force was reduced. For this reason, either (1) remove the protrusion in the area where the splice plate is attached to make the outer surface of the H-beam flat, or (2) make the splice plate larger than usual and make the connection between the splice plate and the tip of the protrusion. It has been common practice to increase the frictional force by increasing the contact area and taking measures such as increasing the number of high-strength bolts to increase the tightening force.

However, with the measure (1) above, there is a problem in that it takes time and effort to process the H-shaped steel to remove the protrusion, and with the measure (2) above, the number of high-strength bolts to be tightened increases, making it difficult to tighten on-site. There was a problem with the work being time consuming.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint that eliminates problems such as the processing effort required to remove 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 the flange. It's about providing structure.

In order to solve the above-mentioned first problem, the present invention according to claim 1 provides a joint structure for longitudinally connecting a protruded H-shaped steel in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of a flange. There it is,
An outer side splicing plate and an inner side splicing plate are provided on the outer and inner surfaces of the flange, respectively, so as to straddle the joint ends of the H-beams with projections, and the flange of the outer side splicing plate On the mating surface to the outer surface, a protrusion is formed in a concave-convex pattern having a convex part that abuts the concave part on the flange side and a concave part that abuts the convex part on the flange side,
There is provided a joint structure for an H-shaped steel with a protrusion, characterized in that the outer side splicing plate, the flange, and the inner side splicing plate are integrally fastened with a plurality of high-strength bolts and nuts.

In the invention according to claim 1, when connecting the H-section steel with projections in which projections are formed in a predetermined uneven pattern on the outer surface of the flange, alignment of the outer side splicing plate disposed on the outer surface of the flange to the outer surface of the flange is performed. It is preferable to use one in which protrusions are formed on the surface in a concavo-convex pattern having convex portions that abut the concave portions on the flange side and concave portions that abut the convex portions on the flange side. Therefore, when a flat splice plate is used, the frictional force only works on the tip surface of the convex part on the flange side, but in the case of the present invention, the frictional force is applied to the concave part on the flange side. The protrusion is formed with an uneven pattern that has a convex part that comes into contact with the convex part and a concave part that comes into contact with the convex part on the flange side, so the contact area can be increased and the frictional force can be applied firmly. Become. Therefore, there is no need to process the H-shaped steel to remove the protrusion, and there is no need to increase the number of bolts.

The present invention according to claim 2 is characterized in that a projection is formed on the surface of the outer attachment plate that is mated to the outer surface of the flange in a pattern of protrusions and recesses that is the exact opposite of the pattern of protrusions and recesses that match the pattern of protrusions and recesses on the outer surface of the flange. A joint structure of a protruded H-beam according to Item 1 is provided.

The invention as set forth in claim 2 provides a first embodiment of the uneven pattern of projections formed on the surface of the outer attachment plate that is mated to the outer surface of the flange. This first embodiment aims at a contact area ratio of 100% (contact area/plane area of the outer side splicing plate), and the protrusions are formed with an uneven pattern that is exactly opposite to the uneven pattern on the outer surface of the flange. This is an example of an embodiment in which the entire area of the outer attachment plate is brought into close contact with the outer attachment plate.

In the present invention according to claim 3, the uneven pattern of the protrusion formed on the outer surface of the flange is an uneven pattern in which an inclined surface for sliding is formed at the boundary between the recess and the protrusion, and the projection on the outer surface side The mating surface of the contact plate to the outer surface of the flange has a convex portion that abuts the concave portion on the flange side and a concave portion that abuts the convex portion on the flange side, excluding the portion corresponding to the sliding slope surface. There is provided a joint structure of a protruded H-section steel according to claim 1, wherein the protrusions are formed in a pattern of protrusions and recesses.

The invention according to claim 3 provides a second embodiment of the uneven pattern of the protrusions formed on the surface of the outer attachment plate that is mated to the outer surface of the flange. In this second embodiment, the portions of the uneven pattern of the flange that correspond to the sloped surface for sliding do not come into close contact. Specifically, when the uneven pattern of the protrusions formed on the outer surface of the flange has an uneven shape with a sliding slope formed at the boundary between the recess and the projection, the sliding slope If you are trying to make them adhere even to the surface, cutting the part corresponding to the slope for sliding will require more processing time, so the part corresponding to the slope for sliding will not be in close contact, and the other area will be cut. This is so that the uneven surfaces are brought into close contact with each other. Even in such a case, it is possible to maintain a contact area ratio (contact area/planar area of the outer attachment plate) of about 80% to 85%.

The present invention according to claim 4 is a claim in which the projection-equipped H-shaped steel is a striped H-shaped steel, and the projections formed on the outer surface of the flange have a regular lattice frame-like uneven pattern along the longitudinal direction and the width direction. A joint structure of a protruded H-beam according to item 1 is provided.

The invention according to claim 4 uses an H-section steel with projections called "striped H-section steel" among various H-section steels with projections sold on the market. Striped H-shaped steel is mainly used as a road surface lining plate, and has a plurality of anti-slip protrusions provided on the outer surface of the flange. The outer surface of the flange of this striped H-shaped steel is pre-formed with protrusions in a predetermined uneven pattern, so it is possible to improve the adhesion performance between the steel and concrete without the need for additional processing to provide the protrusions. . In addition, there are two types of unevenness patterns on the outer surface of the flange of striped H-shaped steel sold in the market: a regular grid frame-like protrusion pattern and a protrusion pattern in which circular protrusions are arranged in a staggered manner. This uses a lattice frame-like protrusion pattern.

The invention according to claim 5 is characterized in that the inner surface of the flange is a flat surface without any protrusions, and the surface of the inner side attachment plate that is mated to the inner surface of the flange is also a flat surface without any protrusions. A joint structure of a protruded H-beam according to Item 1 is provided.

In the invention as set forth in claim 5, the shape of the inner surface of the flange and the shape of the inner side splicing plate are specifically defined. Although there are H-beams on the market that have protrusions in an uneven pattern on the inner surface of the flange, the present invention takes into account the processing time of the splice plate and the adhesion strength with concrete. It is preferable that the inner surface of the flange is a flat surface without any protrusions, and the surface of the inner side splicing plate that is mated to the inner surface of the flange is also a flat surface without any protrusions.

As described in detail above, according to the present invention, problems such as the processing labor required to remove the protrusions and the increase in the number of bolts can be solved when connecting H-section steel with protrusions in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of the flange. It becomes possible to eliminate it.

FIG. 2 is a perspective view of a wall showing a steel-concrete composite structure 1 using an H-shaped steel 2 with projections as a core material (tensile material). FIG. 2 is a perspective view of the striped H-shaped steel 2 from the end side. FIG. 3 is a cross-sectional view of the striped H-shaped steel 2 at an uneven portion (a view taken along the line III-III in FIG. 2). FIG. 3 is a cross-sectional view of the striped H-shaped steel 2 at the protruding portion 6b (view taken along the line IV-IV in FIG. 2). (A) is an exploded longitudinal cross-sectional view, and (B) is a longitudinal cross-sectional view of the connected state, showing the connection method of the striped H-shaped steel 2. (A) is an exploded cross-sectional view, and (B) is a cross-sectional view in a connected state, showing how to connect the striped H-shaped steel 2. (A) is a plan view, and (B) is a cross-sectional view (view taken along the line B-B), showing the outer attachment plate 7. 7A is a plan view and FIG. 3B is a cross-sectional view (view taken along the line B-B), showing a second embodiment of the outer attachment plate 7'. FIG. 7 is a cross-sectional view of a main part showing a state in which the outer side attachment plate 7' is installed on the outer surface of the flange.

Embodiments of the present invention will be described in detail below with reference to the drawings.

In the steel-concrete composite structure 1, as shown in FIG. 1, H-beam steels 2, 2, etc. with protrusions, each having protrusions 6 formed in a predetermined uneven pattern on the outer surface of the flange, are used as core materials (tensile materials). Sometimes.

As shown in the figure, a plurality of the protruded H-beams 2, 2, . . . are arranged in parallel mainly in the tension side region. That is, it is preferable that the flanges 3 and 5 be arranged so as to face the wall surface of the wall, and that the webs 4 and 4 of the adjacent striped H-beams 2 and 2 be spaced apart from each other so as to face each other. In particular, by using the H-section steels 2, 2, etc. with protrusions, the shear strength between the protrusions and the concrete is increased, so that sufficient adhesive force can be obtained between the steel material and the concrete. Although FIG. 1 shows a wall with a steel-concrete composite structure, it goes without saying that it is applicable to other steel-concrete composite structures. In addition to the above-mentioned H-shaped steel 2 with projections, reinforcing bars or the like may be arranged as necessary.

Although multiple types of H-beam steel 2 with protrusions are provided on the market, in this embodiment, an example using an H-beam steel called "striped H-beam steel" will be described in detail. . The striped H-shaped steel 2 has conventionally been mainly used as a road lining plate, and projections 6 are formed on the outer surfaces of the upper and lower flanges 3 and 5 by hot rolling in a predetermined uneven pattern to prevent slipping. It is something that Other than the outer surfaces of the flanges 3 and 5, that is, the inner surfaces of the flanges 3 and 5 and both surfaces of the web 4 are not provided with such projections and are flat surfaces.

The uneven pattern of the protrusion 6 has a plurality of shapes depending on the type of striped H-beam steel, and any of the shapes may be used, but as shown in FIG. It is desirable to use one in which the protrusions 6 are formed in a pattern of protrusions and recesses in the shape of a regular lattice frame along the axial and width directions. The regular lattice frame shape is one in which a plurality of protrusions 6 consisting of protrusions 6a and 6b extending linearly along the axial and width directions of the striped H-shaped steel 2 are arranged at a distance in the width and axial directions, respectively. It is. Specifically, as shown in FIG. 2, a plurality of protrusions 6a, 6a, . Projections 6b, 6b, . . . are formed along the width direction of the member at intervals of . The recess 6c formed in the area surrounded by the protrusions 6a and 6b has a square shape. A sliding slope 6d is formed at the boundary between the square recess 6c and the protrusions 6a, 6b.

By using a regular lattice frame shape as the concavo-convex pattern of the protrusions 6, stronger adhesion to the concrete 3 can be obtained against shear forces acting in the axial and width directions of the striped H-beam 2. , the adhesion performance with concrete 3 can be improved.

The height and shape of the projections 6 are generally commercially available, and as shown in FIG. 3, the width dimension (B) of the intermediate projection 6a among the projections 6a. is 10 mm, the width dimension (D) of the protrusion 6a located at the end is 12 mm, the width (A) of the recess 6c located in the middle is 32 mm, and the width (C) of the recess 6c located at the end is 31.5 mm. It is. Further, the height (e) and height (f) of the sliding inclined portion 6d are each 2 mm.

The protrusion 6 is formed over the entire outer surface of the flanges 3 and 5, that is, the entire length of the outer surface of the flanges 3 and 5 in the width direction and axial direction.

The projections 6 are provided only on the outer surfaces of the flanges 3 and 5, and are not formed on the inner surfaces of the flanges 3 and 5. That is, other than the protrusions 6 on the outer surfaces of the flanges 3 and 5 formed on the ready-made striped H-shaped steel 2, no protrusions are provided on the inner surfaces of the flanges 3 and 5, and the inner surfaces of the flanges are flat surfaces.

As the core material of the steel-concrete composite structure 1, striped H-beam steel 2, in which protrusions 6 in a predetermined pattern of protrusions and recesses are formed in advance on the outer surfaces of the flanges 3 and 5, is used to improve adhesion performance with concrete. There is no need to perform a separate process to provide the steel, and the adhesion performance between the steel and concrete can be improved. Furthermore, the striped H-beam steel is a general-purpose product and can be obtained at low cost.

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

As shown in FIGS. 5 and 6, an outer joint plate 7 and an outer joint plate 7 are attached to the outer and inner surfaces of the upper and lower flanges 3, 5, respectively, so as to straddle the joint end 2a where the striped H-beams 2, 2 are butted together. Inner side attachment plates 8, 8 are provided. The outer attachment plate 7 is composed of a single plate having the same width as the flanges 3 and 5, and the inner attachment plates 8 and 8 have one plate on each side spanning the web 4. It is composed of two boards each.

In particular, in the present invention, as shown in FIG. 7, the flange 3, The protrusion 11 is formed in a concavo-convex pattern having a convex portion 11a that abuts the concave portion 6c on the flange side and a concave portion 11b that abuts the convex portions 6a and 6b on the flange side. In other words, the flanges 3, 5 and the outer attachment plate 7 are located at all parts of the protrusions 6a, 6b formed on the outer surfaces of the flanges 3, 5, the recesses 6c, 6c, and the sloped surface 6d for sliding. The convex parts 11a, 11a, . A protrusion 11 having a concavo-convex pattern is formed between the protrusion 11 and the concave portion 11b formed in the shape of a lattice frame.

As a result, the contact area ratio (contact area/plane area of the outer side splicing plate) between the outer surfaces of the flanges 3 and 5 and the outer side splicing plate 7 can be theoretically made 100%. This makes it possible to secure the frictional force of friction bonding. In addition, if a normal flat plate-shaped outer side attachment plate is used, only the tip surfaces of the protrusions 6a and 6b on the outer surface of the flange of the striped H-shaped steel 2 will come into contact, so the contact will be approximately 45%. Only the area ratio has been secured.

As shown in FIG. 7, the uneven pattern of the outer side joining plate 7 is formed in the same pattern in the longitudinal direction and the width direction, so that the joining end 2a of the striped H-shaped steel 2 is formed on the outer surface of the flange. The width of the protrusion 6b along the width direction of the member is set so that the concavo-convex pattern formed at the joint end 2a continues in the same concavo-convex pattern even at the joint end 2a position. It is preferable that the position crossing the center point be the end.

For example, in one striped H-shaped steel 2, when the end is located at a position shifted in the longitudinal direction from the center point of the recess 6c on the outer surface of the flange, the center point of the recess 6c on the other striped H-shaped steel 2 side By adjusting the amount of deviation from the joint end portion 2a and making the shape of the recessed portion 6c that straddles the joint end portion 2a the same as the other portions, it is possible to continue the same pattern of recesses and recesses.

It is preferable that the uneven pattern of the outer joint plate 7 is provided by hot rolling during manufacturing of the steel plate, but it is also possible to form the uneven pattern by cutting from a steel plate of the same thickness.

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

As shown in FIGS. 5 and 6, the striped H-beams 2 and 2 are connected by arranging the striped H-beams 2 and 2 longitudinally so that their end faces abut, and then connecting the flanges 3 and 5. The outer side splicing plate 7 is arranged on the outer side so that the concave and convex portions fit together, and the inner side splicing plates 8, 8 are arranged on the inner side of the flanges 3, 5, and the outer side splicing plate 7, High-strength bolts 9, 9, . . . are provided passing through the flange 3 (5) and the inner side attachment plate 8, and nuts 10 are screwed and fastened on the opposing sides to achieve integration. Here, it is desirable that the high-strength bolt 9 be placed at an intermediate position within the recesses 6c of the flanges 3 and 5. If it is arranged in a range spanning the protrusions 6a, 6b and the recess 6c, it is not preferable because it may not be able to be tightened uniformly due to differences in thickness or rigidity caused by manufacturing errors or the like.

[Second form example]
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 attachment plate 7 100%, the mating surface of the outer attachment plate 7 to the outer surface of the flange is The structure is such that the protrusion 11 is formed with a pattern of protrusions and recesses that is the exact opposite of the pattern of protrusions and recesses on the outer surfaces of the flanges 3 and 5 that matches. However, in the case where the uneven pattern of the b outer side splicing plate 7 is manufactured by cutting, the slanted surfaces for sliding are formed especially at the boundaries between the peripheries of the recesses 6c of the flanges 3 and 5 and the protrusions 6a and 6b. Forming by cutting, including the slope corresponding to 6d, requires considerable effort.

In order to save this processing effort, the mating surface of the outer attachment plate 7 to the outer surface of the flange has a convex portion that abuts the concave portion 6c on the flange side, excluding the sloped surface portion 6d for sliding. The protrusion 12 is formed in a concavo-convex pattern having a concave and convex pattern 12a and a concave portion 12b that abuts the convex portions 6a and 6b on the flange side.

Specifically, as shown in FIG. 8, in the outer attachment plate 7', a portion corresponding to a range including the protrusions 6a, 6b of the flange 3 (5) and the sloped surface 6d for sliding is formed into a recess. 12b, 12b, . . . , and convex portions 12a, 12a, . The side surface of the convex portion 12a has a shape that stands up perpendicularly to the base surface, that is, the convex portion 12a is a convex portion that protrudes in a prismatic shape.

As shown in FIG. 9, when the outer side attachment plate 7 is installed on the outer surface of the flange 3, the flange 3 and the outer side attachment plate 7, the protrusions 6a and 6b of the flange 3 come into contact with the recess 12b of the outer attachment plate 7', and the protrusion 12a of the outer attachment plate 7' contacts the recess 6c of the flange 3. They are in contact with each other. Even when the concave and convex portions of the flange 3 and the outer attachment plate 7' are brought into contact with each other within the range excluding the sliding slope 6d of the flange 3, the contact area ratio is approximately 80~ Approximately 85% of the frictional force can be secured, and although it is not as good as the first embodiment, it is possible to secure the required frictional force.

DESCRIPTION OF SYMBOLS 1... Steel-concrete composite structure, 2... Striped H-shaped steel, 3, 5... Flange, 4... Web, 6... Protrusion, 7, 7'... Outer side joint plate, 11a, 12a... Convex part, 11b, 12b... Recessed portion, 8...Inner side attachment plate, 9...Bolt, 10...Nut

Claims (5)

A joint structure for longitudinally connecting a protruded H-shaped steel in which protrusions are formed in a predetermined uneven pattern on at least the outer surface of the flange,
An outer side splicing plate and an inner side splicing plate are provided on the outer and inner surfaces of the flange, respectively, so as to straddle the joint ends of the H-beams with projections, and the flange of the outer side splicing plate On the mating surface to the outer surface, a protrusion is formed in a concave-convex pattern having a convex part that abuts the concave part on the flange side and a concave part that abuts the convex part on the flange side,
A joint structure for an H-shaped steel with a protrusion, characterized in that the outer attachment plate, the flange, and the inner attachment plate are integrally fastened with a plurality of high-strength bolts and nuts. 2. The protrusion-equipped H-beam steel according to claim 1, wherein a protrusion is formed on the surface of the outer side splicing plate that is mated to the outer surface of the flange in a pattern of protrusions and protrusions that is the exact opposite of that of the protrusion and protrusion pattern on the outer surface of the flange. joint structure. The uneven pattern of the protrusions formed on the outer surface of the flange has an uneven shape with an inclined surface for sliding formed at the boundary between the recess and the protrusion, and the mating surface of the outer splicing plate to the outer surface of the flange. The protrusions are formed in a concavo-convex pattern including a convex part that abuts the concave part on the flange side and a concave part that abuts the convex part on the flange side, excluding the part corresponding to the slope for sliding. The joint structure of H-shaped steel with projections according to claim 1. 4. The H-shaped steel with projections is a striped H-shaped steel, and the projections formed on the outer surface of the flange have an uneven pattern in the shape of a regular lattice frame along the longitudinal direction and the width direction. Joint structure of H-shaped steel with protrusions. 5. The inner surface of the flange is a flat surface having no protrusions, and the mating surface of the inner side attachment plate to the inner surface of the flange is also a flat surface having no protrusions. Joint structure of H-shaped steel with protrusions.

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