JP2016069889A - Junction structure for structural steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a junction structure for a structural steel that absorbs expansion/contraction of the structural steel in a longer-side direction due to a temperature change, and restricts movement of the structural steel in a direction other than the longer-side direction.SOLUTION: The junction structure for a structural steel is applied to a junction connecting an end of a horizontally installed structural steel to a fixed structure. For example, a member to which a structural steel of a fixed structure 20A is connected is a girder 1, and the structural steel is a beam 2. A structural steel support hardware 3 installed on the girder 1 supports a downward load exerted on an end of the beam 2, while allowing a movement of the beam 2 in a longer-side direction, and restricts a movement of the beam 2 in a horizontal direction orthogonal to the longer-side direction. Lift restriction means 8 is installed that restricts lifting of the end of the beam 2 relative to the structural steel support hardware 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joining structure of steel frames in which ends are joined to fixed structures such as columns and beams in buildings such as distribution warehouses and factories.

  As shown in FIGS. 15 and 16, a building 20 such as a distribution warehouse or a factory is often provided with a long bowl 22 above an opening 21 for carrying in / out goods and raw materials. In this type of eaves 22, for example, a plurality of large beams 1 fixed to a pillar 23 are provided so as to protrude to the outdoor side, and a plurality of small beams 2 are provided between the large beams 1. A brazing material 24 made of a folded plate or the like is attached. The brazing member 24 is attached to the lower side of the large beam 1 and the small beam 2 in consideration of water stoppage of the brazing member 24 and the like. It is for providing.

  Such a long rod 22 joins the large beam 1 and the small beam 2 because the continuously arranged small beam 2 extends due to a temperature rise due to solar radiation and a great force is applied to the joint portion with the large beam 1. Deformation, damage, etc. may occur in the steel frame, bolts, gusset plates, etc. In particular, when the brazing material 24 is attached to the lower side of the large beam 1 and the small beam 2, since the small beam 2 is directly subjected to solar radiation, the temperature rise is remarkable, and the above deformation and damage become more remarkable.

JP 7-062762 A Japanese Patent Application Laid-Open No. 7-062763 Japanese Patent Laid-Open No. 7-071079

  Generally, in buildings 20 such as distribution warehouses and factories, high strength bolts (HTB) are used for joining steel frames such as columns and beams. The same applies to the joint between the large beam 1 and the small beam 2 in the flange 22. The joint with high strength bolts has a strong joint strength, so even if the small beam 2 expands due to temperature rise due to solar radiation, no slip occurs between the large beam 1 and the small beam 2 along the bolt hole consisting of a long hole, and it is movable. May not function as a joint. In this case, the same row of small beams 2 between the large beams 1 in the entire rod 22 behaves as if it were one continuous beam, and the overall elongation is large. For example, in fine weather, it extends about 30 mm with a 100-meter ridge 22. For this reason, deformation and damage of the steel frame, the bolt, the gusset plate, etc. at the portion where the large beam 1 and the small beam 2 are joined are unavoidable.

  In addition, if a medium bolt is used instead of a high-strength bolt for joining the large beam 1 and the small beam 2 in the rod 22, it can always function as a movable joint. Proper use of bolts is not realistic because it causes confusion at the site. Further, if the rod 22 is divided into a plurality of portions in the longitudinal direction, the extension of the small beam 2 is dispersed to reduce the influence on the steel frame, bolt, gusset plate, etc. at the portion where the large beam 1 and the small beam 2 are joined. In this case, however, two large beams 1 are required in each divided portion, and the number of members of the flange 22 increases, resulting in an increase in cost.

  In Patent Documents 1 and 2, in order to prevent the frame from being greatly deformed due to the thermal expansion of the beam due to a fire or the like, a gap is provided in the adjacent frame section, and both frame sections are connected by an extendable joint plate. Thus, a fireproof structure of a building that absorbs the thermal elongation of the beams in both housing sections is disclosed. However, although this structure absorbs thermal elongation between two adjacent housing sections, rigidity in a direction perpendicular to the direction of thermal elongation, for example, vertical direction is not ensured. In addition, the same problem as described above also occurs in the joint between the large beam and the column.

  An object of the present invention is to provide a steel structure that can absorb the expansion and contraction of the steel frame even when the steel frame expands and contracts in the longitudinal direction due to temperature change, and can restrain the movement of the steel frame other than in the longitudinal direction. It is.

  The steel frame joining structure of the present invention is a joining structure for joining an end of a steel frame provided sideways to a fixed structure, and is provided on the fixed structure to allow movement of the steel frame in the longitudinal direction. While supporting a downward load acting on the end portion of the steel frame, and having a steel support hardware that regulates horizontal movement perpendicular to the longitudinal direction of the steel frame, the steel support hardware with respect to the steel support hardware Lifting restricting means for restricting the end of the steel frame from lifting is provided.

  According to this configuration, the horizontal steel support hardware provided on the fixed structure supports the downward load acting on the end of the steel while allowing the steel to move in the longitudinal direction, and is orthogonal to the longitudinal direction of the steel. Restrict horizontal movement. For this reason, when the steel frame expands and contracts in the longitudinal direction due to a temperature change, the end of the steel frame moves in the longitudinal direction of the steel frame with respect to the steel support hardware, thereby absorbing the expansion and contraction of the steel frame. With respect to the force that lifts up the end of the steel frame due to wind or the like, the lifting control means controls the lifting of the end of the steel frame relative to the steel support metal.

The lifting restriction means is, for example, a restriction pin inserted through each hole provided in the end portion of the steel support metal and the steel frame, and the steel support metal of the steel support metal into which the restriction pin is inserted. Either one or both of the hole and the hole of the steel frame may be a long hole extending in the longitudinal direction of the steel frame. This long hole allows the steel frame to move in the longitudinal direction.
Further, the lifting restricting means may be a restricting member that is provided on the steel frame and abuts against a lower end surface of the steel support hardware.
In any case, it is possible to reliably restrict the end of the steel frame from being lifted with respect to the steel support hardware.

For example, the member to which the steel frame of the fixed structure is joined is a steel beam or column, and the steel frame is a beam. In that case, the steel frame is a section steel having a web portion having a cross-sectional shape extending in the vertical direction, and each of the steel support metal pieces is bonded to the fixed structure directly or indirectly, and the piece toward the side of the steel frame. It is good to have a pair of support plates which extend like a hand and sandwich the web part of the steel frame from both sides.
The steel frame can be supported with good balance in the horizontal direction perpendicular to the length direction by being sandwiched from both sides of the steel web portion by the pair of support plates of the steel support hardware.

The steel frame forming the steel frame is an H-shaped steel, and a stacked plate joined to the pair of support plates on both side surfaces of the web portion of the steel frame is movably mounted in the longitudinal direction of the steel frame. It is good to do.
Since the H-shaped steel has a round portion at the connection portion between the web portion and the flange portion, when the web portion on the upper side of the steel frame is directly placed on the support plate, the support plate interferes with the round portion. By placing the overlapping plates joined to both sides of the steel web portion on the support plate, the support plate can be prevented from interfering with the rounded portion.

Further, the steel forming the steel frame is an H-shaped steel, the pair of support plates face both side surfaces of the web portion of the steel frame via a gap, and the upper flange portion of the steel frame is the pair of steel plates. It is good also as a structure which is mounted in the upper end of a support plate so that a movement in the longitudinal direction of the said steel frame is possible, and a spacer interposes in the said clearance gap.
Since the H-shaped steel has a rounded portion at the connection portion between the web portion and the flange portion, when the steel web portion is directly placed on the support plate, the support plate is adjacent to the side surface of the steel web portion. There is a possibility that the support plate interferes with the rounded portion. By providing a gap between the support plate and the side surface of the steel web portion, the support plate can be prevented from interfering with the rounded portion. The gap can be secured by the spacer.

  In this invention, the fixed structure may be a building body of a building, and the steel frame may be a part of an attached structure that is smaller than the building body and protrudes from a part of the building body. Alternatively, the fixed structure may be a building main body of a building, and the steel frame may support a saddle member protruding from the building main body.

  The steel frame joining structure of the present invention is a joining structure for joining an end of a steel frame provided sideways to a fixed structure, and is provided on the fixed structure to allow movement of the steel frame in the longitudinal direction. While supporting a downward load acting on the end portion of the steel frame, and having a steel support hardware that regulates horizontal movement perpendicular to the longitudinal direction of the steel frame, the steel support hardware with respect to the steel support hardware Since the lifting restriction means that restricts the end of the steel frame from rising is provided, even if the steel frame expands and contracts in the longitudinal direction due to temperature changes, the expansion and contraction can be absorbed and the movement of the steel frame other than in the longitudinal direction is restrained. be able to.

(A) is a top view of the joining structure of the steel frame concerning 1st Embodiment of this invention, (B) is a front view. It is II-II sectional drawing of FIG. 1 (B). It is III-III sectional drawing of FIG. 1 (B). It is IV-IV sectional drawing of FIG. 1 (B). It is a front view of the modification of embodiment shown in FIG. (A) is a top view of the joining structure of the steel frame concerning the 2nd Embodiment of this invention, (B) is a front view. It is VII-VII sectional drawing of FIG. 6 (B). It is VIII-VIII sectional drawing of FIG. 6 (B). (A) is a top view of the joining structure of the steel frame concerning the 3rd Embodiment of this invention, (B) is a front view. It is XX sectional drawing of FIG.9 (B). It is XI-XI sectional drawing of FIG. 9 (B). (A) is a top view of the joining structure of the steel frame concerning the 4th Embodiment of this invention, (B) is a front view. It is XIII-XIII sectional drawing of FIG. 12 (B). It is XIV-XIV sectional drawing of Drawing 12 (B). It is a perspective view of the building provided with the eaves. It is a fracture side view of the building.

  An embodiment of the present invention will be described with reference to the drawings. The steel frame joining structures of the following embodiments are, for example, the joining of the large beam 1 and the small beam 2 that support the brazing material 24 in the cage 22 of a building 20 such as a distribution warehouse or factory as shown in FIGS. Applies to locations. The girder 1 is fixed to the column 23 and is provided so as to protrude to the outdoor side. The small beam 2 is provided by joining both ends between a pair of large beams 1. The building main body, which is a portion excluding the ridge 22 of the building 20, is the “fixed structure” in the claims, and the member that becomes a part of the fixed structure 20A is the girder 1. The flange 22 is one of the attached structures provided as an attachment to the fixed structure 20A. The small beam 2 that is a member that is a part of the rod 22 is a “steel frame” in the claims.

  1 to 4 show a first embodiment of the present invention. FIG. 1 is a plan view and a front view of the steel structure, FIG. 2 is a II-II cross-sectional view, FIG. 3 is a III-III cross-sectional view, and FIG. 4 is a IV-IV cross-sectional view. The large beam 1 which is a part of the fixed structure is made of H-shaped steel, and is installed horizontally, for example, horizontally with the web portion 1a facing the vertical direction. The small beam 2, which is a steel frame, is made of an H-shaped steel that is smaller in size than the large beam 1, and is installed horizontally, for example, horizontally with the web portion 2 a facing the vertical direction, and the end portion faces the large beam 1. Large beam 1 and small beam 2 form a right angle. The lower flange portion 2b is removed from the end portion of the small beam 2.

  As a member used for joining the large beam 1 and the small beam 2, a steel frame support metal 3 is provided on the large beam 1. The steel frame support 3 of this embodiment is composed of a pair of support plates 4, 4 arranged at intervals in the length direction of the girder 1. Each support plate 4 is provided perpendicularly to the length direction of the large beam 1, and the small beam support portion 4 b extends in a cantilevered manner toward the small beam 2 from the lower portion of the base portion 4 a fixed to the large beam 1 by welding. Yes. When the large beam 1 and the small beam 2 are joined, the small beam support portions 4b and 4b of the pair of support plates 4 and 4 sandwich the web portion 2a of the small beam 2 from both sides. The support plate 4 is made of, for example, a steel plate.

  On the other hand, the overlapping plates 5 are fixed to both side surfaces of the web portion 2a of the small beam 2 by welding or the like. When the large beam 1 and the small beam 2 are joined, the overlapping plate 5 is movably mounted on the small beam support portion 4 b of the support plate 4. The height of the overlapping plate 5 is determined so that the lower flange 2b of the small beam 2 and the lower flange 1b of the large beam 1 have the same height.

  As shown in FIG. 1 (B) and FIG. 4, pin holes 6 (6B, 6A, 6B) are respectively provided in the end portions of the beam 2 and the beam support portions 4b, 4b of the pair of support plates 4. A regulation pin 7 is inserted through each pin hole 6. One or both of the pin hole 6A of the small beam 2 and the pin hole 6B of the small beam support portion 4b are long holes extending in the longitudinal direction of the small beam 2. In the case of this embodiment, the pin hole 6A of the small beam 2 is a round hole to which the restriction pin 7 is just inserted, and the pin hole 6B of the small beam support portion 4b is a long hole.

  The restriction pin 7 inserted through the pin hole 6 restricts the small beam 2 and the support plate 4 from moving up and down relative to each other. That is, the pin hole 6 and the restriction pin 7 constitute a lifting restriction means 8 that restricts the end of the small beam 2 from floating with respect to the steel frame support 3. The lifting restricting means 8 allows the small beam 2 to move in the longitudinal direction with respect to the steel frame support metal 3 by making the pin hole 6B of the small beam support portion 4b a long hole.

  In addition, positioning holes 9 are respectively provided in the end portions of the beam 2 and the beam support portions 4 b of the pair of support plates 4. A positioning pin (not shown) is inserted through each positioning hole 9 so that the building 20 (FIGS. 15 and 16) having the steel-bonded structure is connected to the beam 1 and the small beam 2 in the middle of construction. Prevent misalignment.

  The large beam 1 and the small beam 2 are joined in the following order. A pair of support plates 4, which are steel frame support fixtures 3, are fixed in advance to the large beams 1, and the end portions of the small beams 2 are placed on the small beam support portions 4 b of these support plates 4. Since the lower flange 2b at the end of the beam 2 is removed, the end of the beam 2 can be placed on the beam support 4b while lowering the beam 2 from above. Good workability. After positioning pins are inserted into the positioning holes 9 to position the beam 2 with respect to the steel support metal 3, the restriction pins 7 are inserted into the pin holes 6 of the beam 2 and the beam support portion 4b of the support plate 4. Is inserted. Thereby, joining work is completed. The positioning pin is pulled out from the positioning hole 9 after the building 20 has been built.

  According to the joining structure of the steel frame having this configuration, the overlapping plate 5 provided on the small beam 2 is movably placed on the pair of support plates 4 of the steel support metal 3 provided on the large beam 1. A downward load acting on the end of the beam 2 is supported while allowing the beam 2 to move in the longitudinal direction. Moreover, since each beam support part 4b of a pair of support plates 4 and 4 has pinched | interposed the web part 2a of the beam 2 from both sides, the horizontal motion orthogonal to the longitudinal direction of the beam 2 is controlled. For this reason, when the small beam 2 expands and contracts in the longitudinal direction due to temperature change, the end of the small beam 2 moves in the longitudinal direction of the small beam 2 along the small beam support portions 4 b and 4 b of the support plates 4 and 4. As described above, since the pin hole 6B of the beam support portion 4b is a long hole, the expansion and contraction of the beam 2 is absorbed. With respect to the force that lifts the end of the beam 2 upward due to wind or the like, the lifting restricting means 8 restricts the lifting of the end of the beam 2 relative to the steel frame support 3.

  Since the downward movement of the end portion of the small beam 2 is restricted by the support plate 4 of the steel support metal 3 and the overlapping plate 5 of the small beam 2 coming into contact with each other, the lifting restricting means 8 is Only the upward movement of the end need be restricted. Therefore, the lifting restriction means 8 may be configured as shown in FIG. The lifting restricting means 8 fixes the restricting plate 12 with the restricting member 11 attached to the upper surface to the lower flange portion 2b of the small beam 2 and brings the restricting body 11 into contact with the lower surface of the support plate 4. Only the lifting of the end of the beam 2 is restricted. The lifting restricting means 8 using the restricting plate 12 is not limited to the first embodiment but can be applied to other embodiments described later.

  6 to 8 show a second embodiment of the present invention. This embodiment is different from the first embodiment in that a steel support metal 3 is fixed to a large beam 1 by welding one substrate 3a and support plates 4A fixed to both side surfaces of the substrate 3a. , 4A. The substrate 3a and the support plate 4A are fixed by a plurality of bolts 13. The support plates 4A and 4A extend in a cantilevered manner toward the small beam 2, and the overlapping plate 5 of the small beam 2 is placed thereon. Others are the same as the first embodiment.

  9 to 11 show a third embodiment of the present invention. The first and second embodiments support the small beam 2 with the steel support metal 3 via the overlapping plate 5 provided on the small beam 2, whereas this embodiment supports the small beam 2 with the steel support metal 3. The upper flange portion 2b is directly supported. As in the first embodiment, the steel frame support metal 3 of this embodiment is composed of a pair of support plates 4B and 4B arranged at intervals in the length direction of the girder 1. Each support plate 4B is provided perpendicular to the length direction of the large beam 1, and the small beam support portion 4Bb is cantilevered from the lower part of the base 4Ba fixed to the large beam 1 to the small beam 2 side. Yes.

  The distance between the pair of support plates 4B, 4B is wider than that of the first embodiment. This is because the small beam 2, which is an H-shaped steel, has a rounded portion 2 c (FIG. 11) at the connection portion between the web portion 2 a and the flange portion 2 b, so that the support plate 4 B is adjacent to the web portion 2 a of the small beam 2. This is because the support plate 4B interferes with the rounded portion 2c when arranged. In order to ensure a gap 14 between the support plate 4B and the web portion 2a of the small beam 2, spacers 15 are provided on both side surfaces of the web portion 2a of the small beam 2. In this example, two spacers 15 extending vertically are provided at positions on both sides of the pin hole 6A. Thus, by providing the gap 14 between the support plate 4B and the web portion 2a of the small beam 2, it is possible to avoid the support plate 4B from interfering with the rounded portion 2c.

  12 to 14 show a fourth embodiment of the present invention. Compared with the third embodiment, this embodiment has a base member 16 in which the steel support hardware 3 is fixed to the girder 1 by welding, and a support plate fixed to both side surfaces of the base member 16. It differs in the point comprised by 4C and 4C. The support plates 4C and 4C extend in a cantilevered manner toward the small beam 2, and the upper flange portion 2b of the small beam 2 is placed thereon. Others are the same as the third embodiment.

  In any of the second to fourth embodiments, as in the first embodiment, when the beam 2 expands and contracts in the longitudinal direction due to a temperature change, the end of the beam 2 extends over the steel support metal 3. The expansion and contraction is absorbed by moving in the longitudinal direction of the beam 2. Further, with respect to the force that lifts up the end of the beam 2 due to wind or the like, the lifting restricting means 8 controls the lifting of the end of the beam 2 with respect to the steel support metal 3.

  In each of the above embodiments, the member to which the steel frame of the fixed structure is joined is the large beam 1 and the steel frame is the small beam 2. However, the member to which the steel frame of the fixed structure is joined is a steel column. The steel frame may be a beam such as a large beam. The member to which the steel frame of the fixed structure is joined may be, for example, a foundation or a wall, and the steel frame may be a steel frame other than a beam as long as the end is joined to the fixed structure.

1 ... Large beam (part of fixed structure)
2 ... Small beam (steel frame)
2a ... Web part 2b ... Flange part 3 ... Steel frame support metal 4, 4A, 4B, 4C ... Support plate 5 ... Overlapping plate 6, 6A, 6B ... Pin hole 7 ... Restriction pin 8 ... Lifting restricting means 11 ... Restricting member 12 ... Gap 13 ... Spacer 20 ... Building 20A ... Fixed structure 22 ... Bag (attached structure)

Claims (7)

A joining structure that joins an end of a steel frame provided sideways to a fixed structure,
A horizontal movement that is provided in the fixed structure and supports a downward load acting on the end of the steel frame while allowing the steel frame to move in the longitudinal direction, and is perpendicular to the longitudinal direction of the steel frame Has steel support hardware to regulate
A steel joint structure provided with a lifting restricting means for restricting the end of the steel from floating with respect to the steel support hardware.   2. The steel frame joint structure according to claim 1, wherein the lifting restricting means is a restricting pin that is inserted through each hole provided in the steel support metal and the end of the steel frame. A steel-bonded structure in which one or both of the hole of the steel frame support metal and the hole of the steel frame through which the metal frame is inserted is a long hole extending in the longitudinal direction of the steel frame.   The steel joint structure according to claim 1, wherein the lifting restricting means is a restricting member that is provided on the steel frame and abuts against a lower end surface of the steel support hardware.   The steel structure according to any one of claims 1 to 3, wherein a member to which the steel frame of the fixed structure is joined is a steel beam or column, and the steel frame is a beam. Bonding structure.   5. The steel structure according to claim 4, wherein the steel frame is a section steel having a web portion having a cross-sectional shape extending in a vertical direction, and each of the steel support hardwares has a base end directly or indirectly to the fixed structure. A steel-frame joining structure comprising a pair of support plates that are joined and extend in a cantilevered manner toward the steel frame and sandwich the web portion of the steel frame from both sides.   6. The steel frame joining structure according to claim 5, wherein the steel frame forming the steel frame is an H-shaped steel, and the pair of support plates have overlapping plates joined to both side surfaces of the web portion of the steel frame. Steel structure that is placed movably in the longitudinal direction.   6. The steel structure according to claim 5, wherein the steel frame forming the steel frame is an H-shaped steel, and the pair of support plates face both side surfaces of the web portion of the steel frame via a gap, A steel joining structure in which an upper flange portion of a steel frame is placed on the upper ends of the pair of support plates so as to be movable in the longitudinal direction of the steel frame, and a spacer is interposed in the gap.

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