JP5744582B2 - Steel pipe combined perforated steel plate gibber - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a steel pipe combined perforated steel plate divel used for shear reinforcement of a joint portion between concrete and steel, and more particularly to a steel pipe combined perforated steel plate gibel applied to a building.

  Patent Document 1 describes an example in which a perforated steel plate gibber is used in a composite girder in which a steel material and a concrete in a civil engineering structure are combined. Patent Document 2 describes an example in which a perforated steel plate gibber is used in combination with a shear cotter for the purpose of relaxing concentrated stress. Patent Document 3 and Patent Document 4 describe an example in which a plastic gibber is used to prevent misalignment between steel and concrete that are coupled to each other.

  Conventionally, a gibber such as a perforated steel plate gibber is mainly used in the civil engineering field, and is rarely used in the building field. The reason is that the concrete capacity to be established differs between the civil engineering field and the building field. In other words, in the civil engineering field, it can be fixed to large objects such as mass concrete, so a large number of perforated steel plate gibbels can be arranged. It is difficult to arrange a large number. Therefore, in order to use a perforated steel plate divel in a building structure, it is necessary to improve the proof stress per perforated steel plate divel.

JP 2007-254975 A Japanese Patent No. 3917806 JP 2006-183306 A JP-A-2005-36498

  In order to improve the yield strength per perforated steel plate gibber, the following methods can be considered. (1) Increase the concrete strength. (2) Increase the hole diameter. (3) Insert the rebar into the hole. (4) Improve the binding force of concrete.

However, when using a perforated steel plate gibber in a building structure, the above methods have the following problems. That is, (1) is expensive. As for (2), the hole diameter is limited depending on where the perforated steel plate gibber is installed. In addition, when the hole diameter is increased, the proof strength per perforated steel plate gibber is determined not by the two-surface shear but by the concrete bearing strength within the hole, so that it is necessary to increase the concrete strength. Although (3) is a general and effective method, there is a problem in the method of holding the inserted reinforcing bar and securing the fixing length of the inserted reinforcing bar. In other words, it takes a lot of work on site. As for (4), it will be impossible in an overcrowded state of building members.
For this reason, when high proof stress is required, or in places where the placement of perforated steel plate gibels is limited, a high yield strength perforated steel plate gibel is required in consideration of the minimum number of placements. .

  An object of the present invention is to provide a steel pipe combined perforated steel plate gibber that has a high yield strength against shearing and can be manufactured at a relatively low cost without particularly increasing the strength of the concrete.

Steel combination perforated steel dowels of this invention, that Yusuke and the steel plate with a hole penetrating the both surfaces is formed, it protrudes through the hole of the steel sheet, and a steel pipe which is formed integrally with the steel plate.

  In the steel pipe combined use perforated steel plate gibber of this configuration, the steel plate is fixed to the steel material of the structure by welding or the like, and concrete is placed around the steel material and the steel pipe combined use perforated steel plate gibber. The cast concrete is also filled into the steel pipe, so that the steel material and the concrete are integrated.

With this configuration, the form of stress transmission is different from that of a conventional perforated steel plate dowel without a steel pipe. In other words, the conventional perforated steel plate diver transmits stress as a supporting pressure from the concrete filled in the steel plate hole, whereas the steel pipe combined perforated steel plate divel transmits stress through the steel pipe. introduce. The concrete in the steel pipe filled in the steel pipe functions as a concrete bolt that improves the resistance to shearing. Thereby, the proof stress with respect to the support pressure from concrete increases, and toughness improves. For example, there is no sudden decrease in yield strength like the two-surface shear of concrete, and the toughness is dramatically improved. As a result, it is possible to ensure toughness without inserting an insertion reinforcing bar into the hole.
Further, the steel pipe combined perforated steel plate gibber having this configuration has a simple structure and can be manufactured at a relatively low cost.

In the steel pipe combined perforated steel plate gibel according to the present invention, the steel plate further includes a plurality of the holes arranged on a straight line, and the arrangement direction of the holes is a fixed surface between the steel plate and the steel material to which the steel plate is fixed. The holes are arranged in only one row, the steel pipes are provided through the holes, and are used as a pulling die for the steel material .
In the steel pipe combined use perforated steel plate gibel according to the present invention, the steel plate may be rectangular, and a plurality of the holes and steel pipes may be arranged along the longitudinal direction.

Steel combination perforated steel dowels of this invention, a steel sheet hole penetrating the both surfaces is formed, it protrudes through the hole of the steel sheet, possess a steel pipe which is formed integrally with the steel sheet, the steel sheet A plurality of the holes are arranged on one straight line, and the arrangement direction of the holes is perpendicular to a fixing surface between the steel plate and the steel material to which the steel plate is fixed, and the holes are arranged in only one row. Because the steel pipe is provided through each hole and used as a pulling die for the steel material, high yield strength against shearing can be obtained without particularly increasing the concrete strength. Can be manufactured at low cost.

(A) is the front view of the steel pipe combined use perforated steel plate gibel concerning the example of a proposal used as the foundation of this invention, (B) is the side view. It is a figure which shows the force which acts on the steel tube combined use perforated steel plate gibber. (A) is a front view which shows the usage example of the steel pipe combined use perforated steel plate gibber, (b) is the perspective view. It is a front view which shows the usage example from which the steel pipe combined use perforated steel plate gibber differs. It is a front view illustrating a use example of the steel pipe together perforated steel dowel according to one exemplary embodiment of the present invention. (A) is a front view of a conventional perforated steel plate gibber, and (B) is a side view thereof. It is a figure which shows the force which acts on a stud dowel.

FIG. 1 shows an example of a proposal that is the basis of the present invention. This steel tube combined use perforated steel plate gibber 1 includes a steel plate 2 in which holes 2a penetrating both surfaces are formed, and a steel pipe 3 penetrating through the holes 2a of the steel plate 2 and projecting on both sides. The steel pipe 3 may protrude only on one side with respect to the steel plate 2. The steel pipe 3 is integrally formed by welding with the steel plate 2 by fillet welding or the like. Note that the steel pipe 3 may be simply press-fitted without joining to the steel plate 2 by welding or the like, or may be joined to the extent of temporary fixing. In this example, the steel plate 2 is rectangular, and three holes 2a and three steel pipes 3 are arranged along the longitudinal direction. Since this steel pipe combined perforated steel plate gibber 1 has a simple structure, it can be manufactured at a relatively low cost.

  In this steel pipe combined perforated steel plate gibber 1, for example, a steel plate 2 is fixed to a steel material (not shown) as a beam or a column of a building structure by welding or the like, and as shown in FIG. Concrete 5 is placed around the gibber 1. The cast concrete 5 is also filled into the steel pipe 3 so that the steel material and the concrete 5 are integrated. The steel pipe concrete 5a filled in the steel pipe 3 functions as a concrete bolt that improves the resistance to shearing.

Of the supporting pressure F acting on the steel pipe combined perforated steel plate gibel 1 from the concrete 5, the force component F ₁ indicated by the black arrow is directly transmitted to the steel plate 2. Because it is transmitted directly, it has high rigidity. Moreover, since there is the steel pipe 3, the apparent bearing area (width b) becomes wider than the cross-sectional area (width a) of the actual steel plate 2, and the stress distribution of the concrete 5a in the steel pipe can be achieved. That is, in general, the destruction of the concrete 5 is a cone-like fracture indicated by a fracture line L extending in the direction of 45 ° starting from the boundary with the cross section (width a) of the steel plate 2 that is the bearing range. When the steel pipe 3 is present, the apparent bearing area is expanded to the intersection (width b) between the inner surface of the steel pipe 3 and the fracture line L. As a result, it is possible to use the concrete 5 having low strength.

Of Bearing force F acting from the concrete 5 to the steel pipe together perforated steel dowel 1, the force component F ₂ indicated by a white arrow is transmitted to the steel plate 2 through the steel in the concrete 5a. Since the influence of bending is larger than that of direct transmission, the rigidity tends to be low, but the bending strength of the steel pipe inner concrete 5a as a concrete bolt contributes to the improvement of the strength.

The proposed steel pipe combined perforated steel plate gibber 1 has a different form of stress transmission than the conventional perforated steel plate gibber 1A having no steel pipe shown in FIG. That is, in the case of the conventional perforated steel plate gibber 1A, the stress as the supporting pressure from the concrete 5 is applied to the steel plate 2 using the shear strength of the concrete (not shown) filled in the hole 2a of the steel plate 2. introduce. For this reason, a sudden decrease in yield strength such as two-plane shearing of concrete may occur. On the other hand, the steel pipe combined use perforated steel rod 1 of this proposed example transmits the support pressure from the concrete 5 to the steel plate 2 via the steel pipe 3. For this reason, when the concrete in steel pipe 5a functions as a concrete bolt with high yield strength, a rapid decline in yield strength does not occur, and the toughness is dramatically improved. Therefore, toughness can be secured without inserting a reinforcing bar into the steel pipe concrete 5a.

The steel pipe combined perforated steel plate gibel 1 of this proposed example is compared with the stud gibel 11 shown in FIG. The stud dowel 11 is provided by fixing studs 13 protruding outward on both surfaces of a steel plate 12. The stud gibber 11 does not exhibit resistance until the stud 13 is deformed. Further, since the resistance is caused by the local supporting pressure FA of the stud 13, the bending strength FB of the stud 13, and the pulling resistance force FC of the stud head 13a, there is a problem that the initial rigidity is low. The steel pipe combined perforated steel plate gibber 1 does not have the above problem.

In summary, the steel pipe combined use perforated steel plate gibber 1 has the following advantages.
The stud gibber 11 does not exhibit resistance until the stud 13 is deformed. However, the steel pipe combined perforated steel plate gibel 1 transmits the supporting pressure F from the concrete 5 directly to the steel plate 2, so that there is no perforated steel pipe. Like the steel plate gibber 1A, the rigidity is high.
-Since there is the steel pipe 3, an apparent bearing area (width | variety b) becomes large and the stress distribution of the concrete 5a in a steel pipe can be aimed at. Therefore, the strength of the concrete 5 can be reduced.
The force component F ₂ other than the force component F ₁ directly transmitted to the steel plate 2 among the supporting pressure F acting on the steel pipe 3 is transmitted to the steel plate 2 by the bending strength of the steel pipe concrete 5 a functioning as a concrete bolt. The effect of bending is greater than that of direct transmission, so the rigidity tends to be low, but it contributes to improved proof stress.
The conventional concept of the perforated steel plate gibber 1 uses the shear strength of the concrete in the hole filled in the hole 2a of the steel plate 2, but the steel pipe combined perforated steel plate gibber 1 is a steel pipe concrete 5a. However, it functions as a concrete bolt having higher proof strength than the above-mentioned concrete in the hole.
-By the steel pipe concrete 5a functioning as a concrete bolt, there is no sudden decrease in proof stress like the two-surface shear of the concrete 5, and the toughness is dramatically improved.
-The steel pipe concrete 5a functions as a concrete bolt, so that it is possible to ensure toughness without inserting an insertion rebar in the steel pipe 3.

Examples of use of the steel pipe combined perforated steel plate gibber 1 of FIG. 1 are shown in FIGS. FIG. 3 shows an example in which the side end along the longitudinal direction of the steel plate 2 is fixed to a horizontal steel material 6 of the building structure, for example, a steel beam flange or a steel plate for bracing. FIG. 4 is an example in which the side end along the longitudinal direction of the steel plate 2 is fixed to a longitudinal steel material 6, for example, a steel column flange or a steel plate. In the usage examples of FIGS. 3 and 4, the steel material 6 is a shear type. FIG. 5 relates to an embodiment of the present invention and is an example in which the side end along the short direction of the steel plate 2 is fixed to the steel material 6. The steel material 6 is, for example, a steel beam flange or a steel plate. In the embodiment of FIG. 5, the steel material 6 is a pulling die.

The steel pipe combined perforated steel plate gibber 1 of the above embodiment and the proposed example has a configuration in which three holes 2a and three steel pipes 3 are arranged along the longitudinal direction of the rectangular steel plate 2, but the hole 2a and the steel pipe 3 are arranged. The number of is not limited. Further, the shape of the steel plate 2 is not limited.

DESCRIPTION OF SYMBOLS 1 ... Steel pipe combined perforated steel plate gibber 2 ... Steel plate 2a ... Hole 3 ... Steel pipe 5 ... Concrete 5a ... Concrete in steel pipe

Claims (2)

And the steel plate with a hole penetrating the both surfaces is formed, protrudes through the hole of the steel sheet, have a said steel plate and steel pipe which is formed integrally with the steel sheet plurality in the hole one straight line The arrangement direction of the holes is perpendicular to the fixing surface of the steel plate and the steel material to which the steel plate is fixed, and the arrangement of the holes is only one row, and the steel pipe penetrates through each hole. A steel pipe combined perforated steel plate gibber provided as a pulling die for the steel material. The steel pipe combined use perforated steel plate divel according to claim 1, wherein the steel plate is rectangular, and a plurality of the holes and steel pipes are arranged along the longitudinal direction.

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