JP2018071170A - Connection member, beam structure and construction method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection member, a beam structure and a construction method therefor that can improve workability.SOLUTION: An underground beam 10 according to the present invention is formed by being arranged at hook projection parts 16, protruding from both sides of a web plate 12, of two steel frames 11A, 11B arranged in series leaving a gap 11C such that the web plate 12 is sandwiched from both sides between a pair of connection members 20A, 20B formed by bending a reinforcing bar, and then fixed with concrete 40 after the connection members 20A, 20B are connected with a binding wire 29 penetrating the gap 11C.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a connecting member that connects two steel frames arranged in series, a beam structure provided with the connecting member, and a construction method thereof.

  2. Description of the Related Art Conventionally, as this type of connecting member, one having a steel plate that is stacked on two steel-frame web plates is known. This steel plate is fixed to each steel frame by being welded to the web plate of each steel frame, and connects the two steel frames (for example, refer to Patent Document 1).

JP 2006-51522 A (FIG. 1)

  However, the conventional connecting member described above requires a special tool for welding the steel plate to the web plate. Thus, in the conventional connection member, there existed a problem that work of connection of two steel frames took time, and workability was bad.

  This invention is made | formed in view of the said situation, and aims at provision of the connection member which can aim at the improvement of workability, a beam structure, and its construction method.

  The invention of claim 1 made to achieve the above object has a pair of flange plates and a web plate, and has two steel frames arranged in series, and straddles the two steel frames. A beam structure having a connecting member for connecting the two steel frames, and a concrete placed so as to surround the two steel frames, between the two steel frames A gap is formed, and the connecting member is composed of a reinforcing bar, and is provided in pairs so as to sandwich the web plate in the thickness direction, and the pair of connecting members are between the two steel frames. Are connected by a binding wire penetrating the gap in the thickness direction of the web plate.

  Invention of Claim 2 is the beam structure of Claim 1, Comprising: Each said steel frame is provided with the hooking protrusion part which protrudes from both surfaces of the said web plate, and each said connection member is provided with a square ring shape. In addition, an annular member that is hooked on the hooking protrusion of each of the two steel frames is included.

  A third aspect of the present invention is the beam structure according to the second aspect, wherein each of the connecting members has a pair of straight portions arranged along the longitudinal direction of the steel frame substantially parallel to the web plate. A mediating member connected by a hatched portion inclined obliquely with respect to the longitudinal direction of the steel frame in a plane is included, and the pair of mediating members intersect the hatched portion when viewed from the thickness direction of the web plate In addition, the intersecting portions of the hatched portions are connected by the binding line, and the pair of straight portions in the mediating member and the annular member are connected by another binding line.

  A fourth aspect of the present invention is the beam structure according to the third aspect, wherein the intermediary member is extended from an end portion on the opposite side to the hatched portion of the pair of straight portions, and approaches each other. A pair of bent ends that are bent in this manner are provided.

  A fifth aspect of the present invention is the beam structure according to the third or fourth aspect, wherein in each of the connecting members, the mediating member is disposed on a side closer to the web plate with respect to the annular member.

  A sixth aspect of the present invention is the beam structure according to any one of the second to fifth aspects, wherein the hooking protrusions in each of the steel frames are formed in a protruding piece shape substantially parallel to the flange plate. Formed and arranged side by side so as to contact the inner edge of the annular member.

  The invention according to claim 7 is the beam structure according to claim 6, wherein an interval between the upper flange plate and the upper hooking protrusion is lower than the lower flange plate and the lower hooking protrusion. It is wider than the interval.

  The invention of claim 8 includes: connecting two steel frames having a pair of flange plates and a web plate in a state where they are arranged in series; and solidifying the two steel frames connected with concrete. A method of constructing a beam structure having a structure in which, when the two steel frames are arranged, a gap is formed between the two steel frames, and the two steel frames are connected by a rebar 1 A pair of connecting members are disposed so as to straddle the two steel frames, the web plate is sandwiched between the pair of connecting members in the thickness direction, and the gap between the two steel frames is defined as the web plate. Connecting the pair of connecting members by a binding line penetrating in the thickness direction.

  Invention of Claim 9 is the construction method of the beam structure of Claim 8, Comprising: Each said steel frame is provided with the hooking protrusion which protrudes from both surfaces of the said web plate, and it is a square ring as said connection member. Each of the steel frames by arranging the annular member so as to straddle the two steel frames when arranging the pair of connecting members so as to straddle the two steel frames. The hook is hooked on the hook protrusion.

  A tenth aspect of the present invention is the beam structure construction method according to the ninth aspect, wherein a pair of straight portions arranged along the longitudinal direction of the steel frame are substantially parallel to the web plate as the connecting member. A mediating member connected by an oblique line portion inclined obliquely with respect to the longitudinal direction of the steel frame within a smooth plane, and the pair of connecting members are arranged so as to straddle the two steel frames That is, the pair of straight portions and the annular member in the mediating member are connected by another binding line, and the hatched portions of the pair of mediating members arranged on both sides of the web plate , And arranged so as to intersect with each other when viewed from the thickness direction of the web plate, and in connecting the pair of connecting members via the binding line, the thickness when viewed from the thickness direction of the web plate Intersection of the shaded area Connecting portions to each other in the binding wire.

  Invention of Claim 11 is the construction method of the beam structure of Claim 10, Comprising: In arrange | positioning the said one pair of connection members so that said two steel frames may be straddled, the said annular member, the said mediation member, Then, the annular member is hooked on the hooking projection.

  The invention of claim 12 is the construction method of the beam structure according to claim 10 or 11, wherein the intermediate member is arranged in the annular shape when the pair of connecting members are arranged so as to straddle the two steel frames. It arrange | positions on the side near the said web plate rather than a member.

  The invention of claim 13 is the construction method of the beam structure according to any one of claims 8 to 12, wherein the two steel frames are placed on a plurality of fixing brackets, The boundary part of the two steel frames is arranged on one of the fixing brackets.

  The invention of claim 14 is a connecting member for connecting two steel frames arranged in series in a beam structure, and is constituted by a reinforcing bar, and is projected from the steel web plate in a square ring shape. And an annular member hooked on the hooking projection.

  A fifteenth aspect of the present invention is the connecting member according to the fourteenth aspect, comprising a reinforcing bar and a pair of straight portions arranged along the longitudinal direction of the steel frame and connected to the annular member. And an oblique line portion that is disposed obliquely with respect to the longitudinal direction of the steel frame in a plane substantially parallel to the web plate and connects the pair of straight line portions.

  The invention according to claim 16 is the connecting member according to claim 15, wherein the mediating member is extended from an end portion on the opposite side to the shaded portion of the pair of linear portions, and approaches each other. A pair of bent ends that are bent in this manner are provided.

  The invention of claim 17 is the connecting member according to claim 15 or 16, wherein the reinforcing bar constituting the mediating member is thinner than the reinforcing bar constituting the annular member.

[Inventions of Claims 1 and 8]
In the present invention, the connecting members that connect the two steel frames are provided in pairs so as to sandwich the web plate in the thickness direction, and the pair of connecting members has a gap formed between the two steel frames. They are connected by a binding line that penetrates in the thickness direction of the web plate. Thus, in this invention, when connecting two steel frames with a connection member, it becomes unnecessary to prepare a special tool etc. separately and the workability | operativity is improved.

  The steel frame may be channel steel, I-type steel, or H-type steel. When the steel frame is H-shaped steel, it is possible to fit a pair of connecting members in a space sandwiched between a pair of flange plates on both the front side and the back side of the web plate.

[Inventions of Claims 2 and 9]
According to the present invention, by hooking the annular member on the hooking protrusion, the annular member can be easily positioned with respect to the steel frame, and the pair of annular members can be easily connected to each other.

[Inventions of Claims 3, 10, and 11]
In the present invention, the pair of annular members are connected via a pair of mediating members. Here, the mediating member has a configuration in which a pair of straight portions arranged along the longitudinal direction of the steel frame are connected by a hatched portion inclined obliquely with respect to the longitudinal direction of the steel frame in a plane substantially parallel to the web plate. The pair of mediating members are arranged such that the hatched portions intersect with each other when viewed from the thickness direction of the web plate, and the intersecting portions of the hatched portions are connected by a binding line. According to the present invention, the connection of the pair of connection members by the binding line passing through the gap between the two steel frames is only required at one place, and the connection of the pair of connection members can be easily performed.

  In the eleventh aspect of the invention, in arranging the pair of connecting members so as to straddle the two steel frames, the annular member and the mediating member are connected, and then the annular member is hooked on the hooking protrusion. In this case, it is possible to easily attach both the annular member and the intermediate member to the steel frame.

[Invention of claim 4]
According to the present invention, the adhesion between the mediating member and the concrete can be improved.

[Inventions of Claims 5 and 12]
According to the present invention, the distance between the pair of mediation members can be shortened, and the connection between the pair of mediation members is facilitated.

[Inventions of Claims 6 and 7]
According to the present invention, the annular member is easily positioned with respect to the steel frame. Further, since the annular member is easily disposed substantially in parallel with the flange plate of the steel frame, it is possible to easily transmit the load applied to one steel frame to the other steel frame via the annular member.

  If the distance between the upper flange plate and the upper hooking protrusion is wider than the distance between the lower flange plate and the lower hooking protrusion, the upper flange plate is exposed from the concrete. In addition, it is possible to secure the cover thickness of the concrete in the connecting member (invention of claim 7).

[Invention of Claim 13]
According to the present invention, the boundary portion between the two steel frames is easily fixed, and the work of passing the binding wire through the gap between the two steel frames can be easily performed.

[Invention of Claim 14]
If the connection member of this invention is used, two steel frames can be connected as follows. That is, a pair of annular members arranged so as to sandwich the web plate is arranged so as to straddle two steel frames and hooked on the hooking protrusion. And a binding wire is penetrated in the clearance gap formed between two steel frames, and a pair of annular members are connected via the binding wire. Thereby, two steel frames are connected. As described above, when the connecting member of the present invention is used, it is not necessary to separately prepare a tool when connecting two steel frames with the connecting member, thereby improving workability. Moreover, by hooking the annular member on the hooking projection, the annular member can be easily positioned with respect to the steel frame, and the pair of annular members can be easily connected to each other.

[Invention of Claims 15 to 17]
In the present invention, a pair of annular members are connected via a pair of mediating members. Here, the mediating member is connected by a hatched portion in which a pair of straight portions arranged along the longitudinal direction of the steel frame is obliquely arranged with respect to the longitudinal direction of the steel frame in a plane substantially parallel to the web plate. It is configured. Therefore, if a pair of mediating members are arranged such that the hatched portions intersect when viewed from the thickness direction of the web plate, and the intersecting portions of the hatched portions are connected by a binding line, the gap between the two steel frames The connection of the pair of connecting members by the binding line penetrating the wire is only required at one place, and the connection of the pair of connecting members can be easily performed. In addition, if the reinforcing bar constituting the mediating member is made thinner than the reinforcing bar constituting the annular member, the pair of mediating members can be easily connected by the binding wire (the invention of claim 17).

  In addition, if it is set as the structure which provided the bending end part which was extended from the edge part on the opposite side to a diagonal line part among straight parts, and was bent so that a diagonal line part may be approached to a mediating member, two steel frames are enclosed. Thus, when placing concrete, the adhesion between the mediating member and the concrete is improved (invention of claim 16).

A sectional side view of a building according to an embodiment of the present invention (A) The perspective view of the steel frame to which the connection member was attached, (B) The perspective view of the steel frame to which the connection member was attached Side view of steel frame with connecting member Side view of a steel frame fixed on a mounting bracket (A) Side view of connecting member, (B) Side view of annular member, (C) Side view of mediating member Side view of steel frame with connecting member locked (A) A cross-sectional view of a steel frame fixed on a fixing bracket, (B) a cross-sectional view of a steel frame with a connecting member attached to one side, (C) a cross-sectional view of a steel frame with a connecting member attached to both sides, (D) Cross-sectional view of a beam of steel frame solidified with concrete

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the underground beam 10 (corresponding to the “beam” of the present invention) of the present embodiment has a structure in which a plurality of steel frames 11 are solidified with concrete 40. The underground beam 10 is disposed on a strip-shaped discarded concrete layer 80 formed on the pile foundation 93 and used as the foundation of the building 90. A base 91 is formed on the underground beam 10, and a plurality of pillars 92 are erected on the base 91. The building 90 may be steel or wooden.

  As shown in FIG. 2, the steel frame 11 is composed of H-shaped steel with flange plates 13 and 14 projecting laterally from the upper and lower ends of the vertical web plate 12, and is disposed of the discarded concrete layer 80 via the fixing bracket 30. It is fixed to the upper surface 80M. And concrete 40 is cast so that the circumference of steel frame 11 and fixed metal fitting 30 may be covered, and underground beam 10 is formed. In the following, the upper flange plate 13 and the lower flange plate 14 in the steel frame 11 are referred to as the upper flange plate 13 and the lower flange plate 14 and are appropriately distinguished.

  As shown in FIG. 1, the fixing bracket 30 has a structure in which a pair of support legs 32, 32 is suspended from a top plate 31 on which the steel frame 11 is placed, and the pair of support legs 32, 32 is discarded. By being fixed to the upper surface 80M of the concrete layer 80, the steel frame 11 is discarded and fixed in a state of being floated from the upper surface 80M of the concrete layer 80. Specifically, bolt insertion holes are formed in the lower flange plate 14 and the top plate 31 of the steel frame 11, and the top plate 31 and the lower flange are inserted with the anchor bolts 55 inserted into the bolt insertion holes. By sandwiching the plate 14 with the fastening nut 56, the lower flange plate 14 of the steel frame 11 and the top plate 31 are tightly coupled, and the steel frame 11 is fixed on the fixing metal 30.

  The anchor bolt 55 passes through a bolt insertion hole that penetrates the upper flange plate 13 and protrudes above the steel frame 11. And the base 91 mentioned above is fixed to the protrusion part of this anchor bolt 55. FIG. Specifically, the foundation 91 is provided with the same H-shaped foundation steel beam 94 as the steel frame 11, and the anchor bolt 55 penetrates the flange plate 95 below the foundation steel beam 94. Then, by tightening the fastening nut 56 on the anchor bolt 55 from above, the upper flange plate 13 of the steel frame 11 and the lower flange plate 95 of the base steel beam 94 are tightly coupled, and the base 91 is connected to the underground beam 10. Fixed on top.

  Here, the underground beam 10 of this embodiment is covered with the concrete 40 in a state where at least two of the steel frames 11 are connected by the connecting member 20. In addition, FIG. 1 represents the state which removed the concrete 40 around the butt | matching part of steel frame 11A, 11B.

  As shown in FIGS. 2 (A) and 2 (B), hooking protrusions 16 and 17 protrude vertically from both sides of the web plate 12 at positions near one end of the two steel frames 11A and 11B. . The two steel frames 11A and 11B are arranged in series with the ends of the two steel frames 11A and 11B on the side where the hooking projections 16 and 17 are provided, and with a gap 11C therebetween. . A pair of connecting members 20A and 20B are hooked on the hook protrusions 16 on the upper side of the two steel frames 11A and 11B. A pair of connecting members 20A and 20B are fastened to a binding wire 29 that is passed through the gap 11C. In the following description, the upper hooking protrusion 16 and the lower hooking protrusion 17 in the hooking protrusions 16 and 17 are referred to as the upper hooking protrusion 16 and the lower hooking protrusion 17 and are appropriately distinguished. To do. Hereinafter, the configuration of the upper hooking protrusion 16, the lower hooking protrusion 17, and the connecting members 20A and 20B will be described in detail.

  The upper hooking protrusion 16 and the lower hooking protrusion 17 are formed by welding and fixing a protruding piece made of a steel plate to the web plate 12. As shown in FIG. 3, the upper hooking protrusion 16 and the lower hooking protrusion 17 have contact surfaces 16M and 17M that are substantially horizontal to the flange plates 13 and 14. The upper hooking protrusion 16 and the lower hooking protrusion 17 are arranged at a position about 100 to 150 mm away from the ends of the steel frames 11A and 11B. The distance between the upper hooking protrusion 16 and the upper flange plate 13 is about 30 to 60 mm, and the distance between the lower hooking protrusion 17 and the lower flange plate 14 is about 16 to 30 mm. That is, the distance between the upper hooking protrusion 16 and the upper flange plate 13 is larger than the distance between the lower hooking protrusion 17 and the lower flange plate 14. The upper hooking protrusion 16 and the lower hooking protrusion 17 have a width in the longitudinal direction of the steel frame 11 of about 80 to 120 mm, a thickness of about 9 to 19 mm, and a depth in the extending direction of the flange plates 13 and 14 of about 35 to 35 mm. It is 47 mm. It is preferable that the upper hooking protrusion 16 and the lower hooking protrusion 17 are configured so as to be located inside the overhang of the flange plates 13 and 14. The upper hooking protrusion 16 and the lower hooking protrusion 17 are provided only at positions near one end of the steel frames 11A and 11B, and the bolt insertion holes for inserting the anchor bolts 55 described above are the steel frames 11A and 11B. Are provided only at positions near the other end. The bolt insertion hole only needs to be formed below the pillar 92, and may be formed at a position other than the positions near the ends of the steel frames 11A and 11B.

  As shown in FIGS. 2 and 3, the connecting members 20 </ b> A and 20 </ b> B include an annular member 21 formed by bending a reinforcing bar and an intermediate member 25 formed by bending a reinforcing bar having a smaller diameter than the annular member 21. The diameter of the reinforcing bar of the annular member 21 is preferably about 16 to 29 mm. The diameter of the reinforcing bar of the mediating member 25 is preferably about 10 to 16 mm.

  The annular member 21 has an angular ring shape in which ends of a pair of U-shaped reinforcing bars 22, 22 bent in a U-shape are welded. The annular member 21 has a rectangular shape and four corners are formed in an R shape. Further, the long side of the annular member 21 coincides with the longitudinal direction of the steel frame 11A. The height of the inner edge of the annular member 21 is slightly larger than the height from the upper surface 16M of the upper hooking protrusion 16 to the lower surface 17M of the lower hooking protrusion 17. In addition, as for the cyclic | annular member 21, the length of the longitudinal direction side of the steel frame 11 is formed in 890 mm or more, and it is desirable that the length of the up-down direction side of the steel frame 11 is formed in 240 mm or more. In addition, although the length of the longitudinal direction side of the steel frame 11 of the annular member 21 of this embodiment is longer than the length of the vertical direction side of the steel frame 11, the vertical direction and longitudinal direction of the steel frame 11 of the annular member 21 are the same. May be the same, or the length of the annular member 21 on the longitudinal direction side of the steel frame 11 may be shorter than the length of the annular member 21 on the longitudinal direction side of the steel frame 11.

  The mediating members 25, 25 are arranged from the first straight portion 25 </ b> A from the end of the first straight portion 25 </ b> A in a plane substantially parallel to the web plate 12 and the first straight portion 25 </ b> A arranged along the longitudinal direction of the steel frame 11. The oblique line portion 25B extending obliquely downward toward the away side, and the longitudinal direction of the steel frame 11 toward the side away from the first straight line portion 25A from the end of the oblique line portion 25B opposite to the first straight line portion 25A. It has the 2nd straight part 25C arranged. A pair of bent end portions that are bent in a semicircular shape so as to be close to each other are provided at the end portions of the first straight portion 25A and the second straight portion 25C opposite to the hatched portion 25B. Yes. Note that the length of the intermediate member 25 in the longitudinal direction of the steel frame 11 is slightly shorter than the length of the annular member 21 in the longitudinal direction of the steel frame 11, and the length of the intermediate member 25 in the vertical direction of the steel frame 11 is that of the annular member 21. The length is substantially the same as the length of the steel frame 11 on the vertical direction side.

  The connecting members 20A and 20B are formed by connecting and fixing the annular member 21 and the first straight portion 25A and the second straight portion 25C of the mediating member 25 with a binding wire 28.

  The pair of connecting members 20 </ b> A and 20 </ b> B are disposed on both sides of the web plate 12. Then, as shown in FIGS. 2 (A) and 2 (B), the pair of connecting members 20A and 20B are hooked on the upper hooking protrusions 16 provided on both surfaces of the two steel frames 11A and 11B. In the state, it is fastened with a binding wire 29. In this state, as shown in FIG. 3, the mediating member 25 is arranged so that the hatched portions 25 </ b> B and 25 </ b> B intersect with each other in an X shape with the web plate 12 interposed therebetween. The mediating member 25 is arranged on the web plate side, and the intersection of the mediating members 25, 25 is fixed by a binding wire 29. In addition, it is desirable that the binding wires 28 and 29 are made of wire numbers or thin steel materials. Moreover, it is desirable that the diameters of the binding wires 28 and 29 are about 0.8 to 5 mm.

  The description regarding the structure of the underground beam 10 of this embodiment is above. Next, the construction method of the underground beam 10 will be described.

  In order to construct the underground beam 10, first, a pile foundation 93 is formed according to the ground of the construction site (see FIG. 4). Next, excavation is performed to form a discarded concrete layer 80. Then, inking is performed, and inking (not shown) indicating the position of the beam or the like is applied. Then, based on the ground ink, the fixing bracket 30 is discarded and fixed to the upper surface 80M of the concrete layer 80 (see FIG. 4).

  Next, as shown in FIG. 4, the steel frame 11 is placed on the fixing bracket 30. Here, in the underground beam 10 of this embodiment, as the steel frame 11, at least two steel frames 11A and 11B provided with the hooking projections 16 and 17 are prepared. Then, the steel frames 11 </ b> A and 11 </ b> B are placed on the fixture 30 so that the end portions on the side where the hooking protrusions 16 and 17 are provided are brought into contact with each other. At this time, of the ends of the two steel frames 11A and 11B, the lower flange plate 14 at a position closer to the end opposite to the side where the hooking projections 16 and 17 are provided, and the top plate 31 of the fixing bracket 30 The steel frames 11 </ b> A and 11 </ b> B are arranged on the fixture 30 so that the bolt insertion holes provided on the metal plate 11 overlap. Further, the end portions on the side where the hooking protrusions 16 and 17 are provided are arranged so that the respective end portions of the two steel frames 11A and 11B are accommodated on one fixing bracket 30.

  Next, the fixing bracket 30 and the steel frame 11 are fixed. Specifically, among the two steel frames 11A and 11B, the anchor bolt 55 is inserted into the bolt insertion hole of the fixing bracket 30 and the bolt insertion hole of the lower flange plate 14, and the lower flange is clamped by the tightening nut 56. The plate 14 and the top plate 31 of the fixture 30 are coupled. The anchor bolt 55 passes through the bolt insertion hole of the upper flange plate 13.

  Next, the steel frame 11A and the steel frame 11B are connected. Hereinafter, the connection method will be described in detail.

  First, as shown in FIG. 5, a pair of annular members 21, 21 (see FIG. 5B) and a pair of mediating members 25, 25 (see FIG. 5C) are prepared. Then, as shown in FIG. 5A, the annular member 21 and the first straight portion 25A and the second straight portion 25C of the mediating member 25 are fastened with a binding wire 28 to connect the annular member 21 and the mediating member 25. A pair of connecting members 20A, 20B is formed. The pair of connecting members 20A and 20B has the same arrangement of the annular member 21 and the mediating member 25 (for example, the annular member 21 is arranged on the near side and the mediating member 25 is arranged on the back side). In addition, the hatched portions 25B of the mediating member 25 are connected so as to incline in the same direction.

  Next, as shown in FIGS. 6 and 7A, the connecting member 20A is connected to the upper hook protruding from one surface of the two steel frames 11A and 11B so that the mediating member 25 is disposed on the web plate 12 side. Hang on the protrusion 16. Further, as shown in FIG. 7 (B), the other connecting member 20B is also connected to the web of the two steel frames 11A and 11B so that the mediating member 25 is arranged on the web plate 12 side, similarly to the connecting member 20A. It hooks on the upper hooking protrusion 16 protruding from the opposite surface of the plate 12. At this time, as shown in FIG. 3, the hatched portions 25B, 25B of the mediating members 25, 25 arranged with the web plate 12 interposed therebetween are arranged in an X shape so as to intersect. In addition, the intersection of the shaded part 25B of the mediating member 25 is disposed in the gap 11C between the two steel frames 11A and 11B.

  Next, the intersection of the mediating member 25 of the connecting members 20 </ b> A and 20 </ b> B is fastened and fixed with a binding wire 29. Thereby, steel frame 11A, 11B is connected by a pair of connecting member 20A, 20B. Thus, the connection of the steel frames 11A and 11B by the connecting member 20 is completed.

  Next, the steel frame 11, the fixing bracket 30, the anchor bolt 55, and the connecting member 20 are covered with the concrete 40 to form the underground beam 10 (see FIG. 7D). Specifically, a concrete casting mold (not shown) is installed on the upper surface 80M of the discarded concrete layer 80 so as to surround the steel frame 11, and the concrete 40 is poured into the mold. At this time, the concrete 40 is placed so as to be substantially flush with the upper surface of the steel frame 11, that is, the upper surface of the upper flange plate 13. And after curing concrete 40, a formwork is removed. The underground beam 10 is completed by the above.

  The explanation about the construction method of the underground beam 10 is above. Next, the effect of the underground beam 10 according to the present embodiment, its construction method, and the connecting member 20 will be described.

  According to the present embodiment, the steel frame 11A and the steel frame 11B are coupled using the coupling members 20A and 20B. Then, the steel members 11A, 11B and the like are solidified with the concrete 40 in a state where the connecting members 20A, 20B sandwiching the web plates 12 of the steel frames 11A, 11B in the thickness direction are fastened by the binding wire 29, thereby connecting the two steel frames 11A connected. , 11B can be formed. That is, as compared with the conventional case where two steel frames 11A and 11B are connected by welding steel plates, the ground where the steel frames 11A and 11B are connected without using a special tool. The intermediate beam 10 can be constructed. Moreover, compared with the case where two steel frames 11A and 11B are connected by welding steel plates, it is possible to reduce the time and effort required for connection. Furthermore, when the steel plates 11A and 11B are connected by welding the steel plates, a large work space for welding the steel plates is required. In the present embodiment, the connecting members 20A and 20B are connected to the binding wires. The steel frames 11A and 11B can be easily connected at the construction site, since it only needs to be tightened at 29 and does not require a large work space.

  Further, since the annular member 21 and the mediating member 25 are connected to the steel frames 11A and 11B after being connected by the binding wire 28, the connecting members 20A and 20B are connected by the binding wire 29 at one place at the intersection of the mediating member 25. . Thereby, compared with the case where several places of connecting member 20 are connected by binding wire 29 after attaching connecting members 20A and 20B to steel frames 11A and 11B, connecting members 20A and 20B can be connected easily. Further, by arranging the hatched portions 25B and 25B of the pair of mediating members 25 and 25 in an X shape, the shearing force can be transmitted to the steel frames 11A and 11B by the action of different muscles.

  Furthermore, since the mediating member 25 connected by the binding wire 29 is disposed closer to the web plate 12 than the annular member 21, the mediating members 25 and 25 can be easily fixed by the binding wire 29.

  Further, by providing the upper hooking protrusion 16, the connecting members 20A and 20B can be easily positioned with respect to the steel frames 11A and 11B, and the connecting members 20A and 20B can be easily connected to each other.

  Furthermore, since the upper hooking protrusion 16 and the lower hooking protrusion 17 are substantially parallel to the flange plates 13 and 14, the annular member 21 can be installed to extend substantially parallel to the flange plates 13 and 14. . Further, after the concrete 40 is hardened, the load applied to each steel frame 11 can be transmitted via the annular member 21 and the concrete 40.

  Furthermore, since the end of the two steel frames 11A and 11B on the side to be abutted is placed on one fixing bracket 30, the steel frames 11A and 11B are used even before the concrete 40 is hardened. However, it can suppress that it inclines below as it goes to the edge part of the side faced.

  Further, when both ends of the mediating member 25 are bent in a semicircular shape, the adhesion between the concrete 40 and the mediating member 25 can be improved, and the length of the mediating member 25 in the longitudinal direction of the steel frame 11 is shortened. can do.

  Further, when the upper surface of the steel frame 11 is exposed from the concrete 40 by making the distance between the upper flange plate 13 and the upper hooking protrusion 16 larger than the distance between the lower hooking protrusion 17 and the lower flange plate 14. Even so, the cover thickness of the concrete 40 in the connecting member 20 can be ensured.

  Further, since the steel frame 11 is made of H-shaped steel, the connecting member 20 can be stored in a space sandwiched between the pair of flange plates 13 and 14.

  Furthermore, according to the underground beam 10 of the present embodiment, a load applied to one of the steel frames 11, for example, the steel frame 11A, can be transmitted to the other steel frame 11B via the connecting member 20. Further, the load can be distributed not only to the web plate but also to the flange plate. In addition, as a load applied to the steel frames 11A and 11B, for example, regarding a downward shearing stress, between the steel frames 11A and 11B via the connecting member 20 and the concrete 40 covering the periphery and the upper hooking projections 16 and 16. The upward shearing stress can be transmitted between the steel frames 11 </ b> A and 11 </ b> B via the connecting member 20, the concrete 40 covering the periphery thereof, and the lower hooking protrusions 17 and 17. As for bending stress, the steel member is connected via the connecting member 20 and the concrete 40 surrounding the connecting member 20 and one steel frame 11, for example, the upper hooking protrusion 16 of the steel frame 11A and the lower hooking protrusion 17 of the other steel frame 11B. It is possible to transmit between 11A and 11B.

  Moreover, when connecting the steel plates 11A and 11B on the web plate 12 by using bolts to connect the steel plates 11A and 11B with bolts, it is necessary to provide through holes for bolt insertion in the steel frames 11A and 11B in advance. When opening a hole, a hole defect occurs. On the other hand, since the underground beam 10 of the present embodiment is configured to be hooked on the upper hooking protrusion 16 formed on the steel frames 11A and 11B, no hole defect occurs.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various modifications are possible within the scope of the invention other than the following. It can be changed and implemented.

  (1) In the embodiment described above, the intermediate member 25 is provided. However, the intermediate member 25 may be omitted. In this case, the annular member 21 is hooked on the upper hooking projections 16 and 16 on both surfaces of the steel frames 11A and 11B, and the portions of the annular members 21 and 21 hooked on both surfaces are overlapped by the gap 11C between the steel frame 11A and the steel frame 11B. Tighten with the binding wire 29 and fix. Of the portions of the annular members 21 and 21 that overlap at the gap 11C between the steel frames 11A and 11B, only the upper portion or the lower portion may be fixed, or the upper portion and the lower portion may be fixed. Both of the overlapping parts may be fixed.

  (2) In the above embodiment, the annular member 21 is formed in an annular shape by welding the ends of the two U-shaped reinforcing bars 22, 22 bent in a U-shape. The reinforcing bars may be formed in an annular shape.

  (3) In the above-described embodiment, the steel frame 11 is placed on the fixing bracket 30. However, a configuration without the fixing bracket 30 may be used.

  (4) In the above embodiment, H-shaped steel is used for the steel frame 11, but I-shaped steel may be used, or groove-shaped steel may be used.

  (5) A wire mesh for preventing cracking of the concrete 40 may be provided in parallel with the web plate 12.

  (6) The connecting members 20A and 20B may be used to connect the steel frames of a steel-reinforced concrete beam having a plurality of reinforcing bars around the steel frame 11.

  (7) Instead of the mediating member 25, a reinforcing bar bent in a Z shape may be used.

  (8) In the above-described embodiment, the steel frames 11A and 11B are placed on the fixing bracket 30, and then the steel frame 11A and the steel frame 11B are connected using the connecting member 20, but the steel frame 11A using the connecting member 20 is used. The steel frames 11A and 11B may be placed on the fixing bracket 30 after connecting the steel frame 11B and the steel frame 11B.

  (9) In the above-described embodiment, the annular member 21 and the mediating member 25 are connected by the binding wire 28, but the annular member 21 and the mediating member 25 may be fixed in advance by welding.

  (10) In the above-described embodiment, the annular member 21 and the first straight portion 25A and the second straight portion 25C of the mediating member 25 are connected one by one, but may be connected two by two.

  (11) In the above-described embodiment, the steel frame 11 has a configuration that does not have a stiffener, but may have a configuration that has a stiffener on the center side of the upper hooking protrusion 16 and the lower hooking protrusion 17.

DESCRIPTION OF SYMBOLS 10 Underground beam 11 Steel frame 12 Web plate 13 Upper flange plate 14 Lower flange plate 16 Upper hook protrusion 17 Lower hook protrusion 20 Connecting member 21 Annular member 25 Intermediary member 28, 29 Binding wire

Claims (17)

Two steel frames having a pair of flange plate and web plate and arranged in series;
A connecting member arranged so as to straddle the two steel frames, and connecting the two steel frames;
A concrete structure placed so as to surround the two steel frames, and a beam structure,
A gap is formed between the two steel frames,
The connecting member is composed of reinforcing bars and is provided in pairs so as to sandwich the web plate in the thickness direction,
The pair of connecting members are connected by a binding line that penetrates the gap between the two steel frames in the thickness direction of the web plate. The beam structure according to claim 1,
Each steel frame is provided with a hooking protrusion that protrudes from both sides of the web plate,
Each of the connecting members includes an annular member that is formed in a square ring shape and is hooked on the hook protrusions of the two steel frames. The beam structure according to claim 2,
A pair of linear portions arranged along the longitudinal direction of the steel frame is connected to each of the coupling members by a hatched portion inclined obliquely with respect to the longitudinal direction of the steel frame in a plane substantially parallel to the web plate. Mediating members that are
The pair of mediating members are arranged so that the hatched portions intersect when viewed from the thickness direction of the web plate, and the intersecting portions of the hatched portions are connected by the binding line,
The pair of straight portions in the mediating member and the annular member are connected by another binding line. The beam structure according to claim 3,
The intermediary member is provided with a pair of bent end portions that are extended from ends opposite to the hatched portion of the pair of linear portions and bent so as to approach each other. The beam structure according to claim 3 or 4,
In each of the connecting members, the mediating member is disposed on the side closer to the web plate with respect to the annular member. The beam structure according to any one of claims 2 to 5,
The hook protrusions in each steel frame are formed in a protruding piece shape substantially parallel to the flange plate, and are arranged side by side so as to contact the inner edge of the annular member.   7. The beam structure according to claim 6, wherein an interval between the upper flange plate and the upper hooking protrusion is larger than an interval between the lower flange plate and the lower hooking protrusion. ing. Connecting two steel frames having a pair of flange plates and web plates arranged in series;
Solidifying the two connected steel frames with concrete, and a method of constructing a beam structure comprising:
When arranging the two steel frames, a gap is formed between the two steel frames,
To connect the two steel frames,
Arranging a pair of connecting members composed of reinforcing bars so as to straddle the two steel frames, and sandwiching the web plate in the thickness direction by the pair of connecting members;
Connecting the pair of connecting members by a binding line passing through the gap between the two steel frames in the thickness direction of the web plate. It is the construction method of the beam structure of Claim 8, Comprising:
Each steel frame is provided with a hooking protrusion that protrudes from both sides of the web plate,
Including, as the connecting member, an annular member having a rectangular shape,
In arranging the pair of connecting members so as to straddle the two steel frames, the annular member is arranged so as to straddle the two steel frames and hooked on the hooking protrusions of the steel frames. It is the construction method of the beam structure according to claim 9,
As the connecting member, a pair of straight portions arranged along the longitudinal direction of the steel frame is connected by a hatched portion inclined obliquely with respect to the longitudinal direction of the steel frame in a plane substantially parallel to the web plate. Further comprising providing a mediating member;
In arranging the pair of connecting members so as to straddle the two steel frames,
Connecting the pair of straight portions in the mediating member and the annular member by another binding line;
Disposing the hatched portions of the pair of mediating members disposed on both sides of the web plate so as to intersect when viewed from the thickness direction of the web plate,
When connecting the pair of connecting members via the binding line, the crossing portions of the hatched portions viewed from the thickness direction of the web plate are connected by the binding line. It is a construction method of the beam structure according to claim 10,
In arranging the pair of connecting members so as to straddle the two steel frames, the annular member and the mediating member are connected, and then the annular member is hooked on the hooking projection. It is the construction method of the beam structure of Claim 10 or 11,
In arranging the pair of connecting members so as to straddle the two steel frames, the mediating member is arranged closer to the web plate than the annular member. A construction method for a beam structure according to any one of claims 8 to 12,
The two steel frames are placed on a plurality of fixing brackets, and a boundary portion between the two steel frames is disposed on one fixing bracket. A connecting member for connecting two steel frames arranged in series in a beam structure,
It is comprised with a reinforcing bar, and has an annular member hooked by the hooking protrusion part which carried out the annular | circular shape and protruded from the web plate of the said steel frame. The connecting member according to claim 14,
A pair of straight portions that are configured by reinforcing bars and are arranged along the longitudinal direction of the steel frame and connected to the annular member, and the longitudinal direction of the steel frame within a plane substantially parallel to the web plate It further has a mediating member provided with an oblique line portion and an oblique line portion connecting the pair of straight line portions. The connecting member according to claim 15,
The intermediary member is provided with a pair of bent end portions that are extended from ends opposite to the hatched portion of the pair of linear portions and bent so as to approach each other. The connecting member according to claim 15 or 16,
The reinforcing bar constituting the mediating member is thinner than the reinforcing bar constituting the annular member.

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