JP4771138B2 - Joining structure between steel beam and concrete body and its construction method - Google Patents

Description

  The present invention relates to a joint structure between a steel beam and a concrete body, and a construction method of the joint structure.

  Conventionally, a joining structure in which a steel beam and a concrete column are joined by pressure bonding using a PC steel material has been provided. This joint structure has a structure in which a PC steel material extending in the extending direction of the steel beam is embedded in the joint portion of the concrete column. A tensile force is introduced into the PC steel material and the end of the PC steel material is By being fixed to the end plate at the end of the steel beam, prestress is applied to the concrete column, and the end plate of the steel beam is pressed against the side surface of the concrete body.

In the conventional joint structure described above, a gap is provided between the end plate of the steel beam and the side surface of the joint portion of the concrete column in order to effectively transmit the bearing pressure due to the prestress of the crimping surface. Is filled with mortar. This mortar filling operation needs to be performed before the tension work for introducing the tensile force to the PC steel material. In the conventional joint structure, the PC steel material is tensioned after the mortar is hardened and prestress is applied to the concrete column. (For example, refer to Patent Documents 1 and 2.)
Japanese Patent Laid-Open No. 5-331912 Japanese Patent Application Laid-Open No. 7-252884

  However, in the above-described conventional joint structure, there is a limitation that the tension work of the PC steel material cannot be performed unless the mortar is hardened, and thus there is a problem that this limitation may be disadvantageous in the process. Moreover, there is a problem that the positioning work of the steel beam performed prior to the mortar filling work is complicated.

  The present invention takes the above-described conventional problems into consideration, can determine the process regardless of mortar filling and mortar hardening, can easily perform positioning of the steel beam, and can shorten the work period. An object of the present invention is to provide a joint structure between a steel beam and a concrete body, and a construction method thereof.

In the joining structure of a steel beam and a concrete body according to the present invention, a PC steel material is installed in the concrete body, a tensile force is introduced into the PC steel material, and at least the end portion of the PC steel material is made of a steel frame. By being fixed at the end of the steel beam, the reaction force against the tensile force introduced into the PC steel material is transmitted to the concrete body through the end of the steel beam, and prestress is applied to the concrete body. In the joined structure of the steel beam and the concrete body in which the concrete body and the steel beam are joined, a sheath tube for inserting a PC steel material is embedded inside the concrete body, and the sheath the end of the tube, hollow-tipped coupler is attached to PC steel material is inserted therein while being contact with the end face of the steel beam, versus tensile forces introduced into the PC steel It is characterized in that it is capable transmitting the reaction force to the concrete body through the coupler and the sheath tube from an end face of said steel beam that.

In the construction method of the joint structure between the steel beam and the concrete body according to the present invention, the PC steel material is installed in the concrete body, a tensile force is introduced into the PC steel material, and the end of the PC steel material is at least Since the end is fixed to the end of the steel beam made of steel, a reaction force against the tensile force introduced into the PC steel material is transmitted to the concrete body through the end of the steel beam. In the construction method of the joint structure of the steel beam and the concrete body in which the concrete body and the steel beam are joined in a state where prestress is applied to the steel body, in order to insert the PC steel material into the concrete body in advance The sheath tube is embedded, and at the end of the sheath tube, a hollow coupler through which the PC steel material is inserted is attached, and the end face of the steel beam is brought into contact with the tip of the coupler, The steel beam is placed on the side of the concrete body and the PC steel material is inserted into the sheath tube. After that, tensile force is introduced into the PC steel material and the end of the PC steel material is fixed to the end surface of the steel beam. By performing the process, a reaction force against the tensile force introduced into the PC steel material is transmitted from the end surface of the steel beam to the concrete body via the coupler and the sheath tube, and a prestress is applied to the concrete body. It is characterized by that.

Due to these characteristics, when a tensile force is introduced into the PC steel material, the reaction force from the end surface of the steel beam is taken by the coupler whose tip abuts against the end surface of the steel beam, and the coupler and sheath tube are connected from the end surface of the steel beam. The bearing pressure due to the prestress is effectively transmitted to the concrete body . Further, when the steel beam is arranged on the side of the concrete body, the position of the steel beam in the axial direction is determined by bringing the end face of the steel beam into contact with the tip of the coupler.

  Further, the present invention is characterized in that, in the above-described joint structure between a steel beam and a concrete body, a beam receiving material for supporting the steel beam is provided below the steel beam.

  With such a feature, when the steel beam is arranged on the side of the concrete body, the vertical position of the steel beam is determined by placing the steel beam on the beam receiving member and arranging the steel beam.

  Further, the present invention is characterized in that, in the above-described structure of joining a steel beam and a concrete body, the coupler is attached by screwing the coupler into the end portion of the sheath tube.

  With such a feature, the tip position of the coupler can be easily adjusted by adjusting the degree of tightening of the coupler by rotating the coupler.

  Further, the present invention is characterized in that, in the above-described joint structure between a steel beam and a concrete body, the sheath tube is made of a hollow deformed steel bar.

  With such a feature, the stress in the region where the sheath tube is embedded and becomes a joint portion is easily dispersed.

According to the joining structure between a steel beam and a concrete body and its construction method according to the present invention, when a tensile force is introduced into a PC steel material, the reaction force is transmitted from the end face of the steel beam via a coupler and a sheath tube to the concrete body. to be transmitted to, without filling the filler mortar or the like between the side end face and the concrete bodies of the steel beam, it is possible to perform a tensioning operation to introduce a tensile force into the PC steel. Thereby, a process can be determined irrespective of mortar filling and mortar hardening, and a work period can be shortened. In addition, since the position of the steel beam in the axial direction when the steel beam is arranged on the side of the concrete body is determined by the coupler, the steel beam can be easily positioned, thereby shortening the construction period. be able to.

  Further, the present invention has a structure in which a beam receiving material for supporting the steel beam is provided below the steel beam, so that the vertical position of the steel beam when the steel beam is arranged on the side of the concrete body. Since it is determined by the beam receiving material, the steel beam can be easily positioned, thereby shortening the construction period.

  Further, the present invention is configured to attach the coupler to the end of the sheath tube by screwing the coupler to the end of the sheath tube, thereby adjusting the degree of tightening of the coupler so that the tip position of the coupler can be adjusted. Since it is easily adjusted, the axial position of the steel beam can be easily positioned.

  Further, according to the present invention, by using a sheath tube made of a hollow deformed steel bar, the stress in the region where the sheath tube is embedded and becomes the joint portion is easily dispersed, which is advantageous for the strength of the joint portion. .

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a joining structure between a steel beam and a concrete body and a construction method thereof according to the present invention will be described based on the drawings.

First, the structure of the joining structure of the steel beams 1 and 1 and the concrete pillar 2 as a concrete body will be described.
FIG. 1 is a cross-sectional view of the joint structure between the steel beams 1 and 1 and the concrete column 2, and FIG.

As shown in FIGS. 1 and 2, in the present embodiment, two steel beams 1 and 1 extending coaxially are disposed on both sides of the joint portion 2a of the concrete column 2 respectively. In the joint structure according to the present embodiment, a plurality of PC steel materials 3 extending along the axis extension line of the steel beams 1 and 1 are installed in the joint portion 2a of the concrete column 2, and these PCs are installed. The tensile force is introduced into each of the steel members 3 and both ends of the PC steel members 3 are fixed to the steel beams 1 and 1 on both sides, thereby prestressing the concrete column 2 and the end surfaces of the steel beams 1 and 1. it is intended to crimp respectively through the filling material 8 against the side surface of the Joint portion 2a of the concrete column 2.

  The steel beams 1 and 1 on both sides extend in a direction orthogonal to the concrete column 2 and are arranged perpendicular to the concrete column 2. The steel beam 1 has a configuration in which an end plate 5 such as a steel plate is attached to an end of a long steel material 4 (H-shaped steel in the present embodiment). The end plate 5 is disposed perpendicular to the axial direction of the steel beam 1 (steel material 4), and is welded to the end surface of the steel material 4. The end plate 5 is an end surface of the steel beam 1.

  Note that the steel beam 1 according to the present invention may be a beam having an end made of steel, and the entire beam is made of steel (S), the end is made of steel, and the middle part of the beam is other than that. For example, a beam structure including a prestressed reinforced concrete (PRC) structure, a reinforced concrete (RC) structure, a steel reinforced concrete (SRC) structure, and a steel pipe concrete (SC) structure is also included.

  The concrete column 2 is a column in which the entire column or a part of the column is made of precast reinforced concrete, and at least the joint portion 2a is formed of precast reinforced concrete. A plurality of sheath pipes 6 for inserting the PC steel material 3 are embedded in the joint portion 2a of the concrete column 2. The plurality of sheath tubes 6 are respectively extended along the axial extension lines of the steel beams 1, 1, and are arranged in parallel at intervals. Further, the plurality of sheath pipes 6 are respectively arranged at positions facing the end plate 5 of the steel beam 1 arranged on the side of the concrete column 2, and are arranged along the outer edge of the end plate 5. .

  The sheath tube 6 is a hollow member in which a through hole 6a extending in the axial direction is formed in the center of a deformed steel bar having irregularities formed on the outer peripheral surface thereof, and the PC steel material 3 is inserted into the hollow member. ing. Both end portions 6b and 6b of the sheath tube 6 have an outer diameter increased, and a thread is formed on the inner peripheral surface, and the sheath tube 6 has a structure in which female threads are formed at both ends. Yes. Further, both end surfaces of the sheath tube 6 are flush with the side surface of the concrete column 2 (joint portion 2a), and both end portions 6b and 6b of the female tube shape of the sheath tube 6 are connected to the concrete column 2 (finished portion). Each is open toward the side of the mouth 2a).

  Couplers 7 and 7 are attached to both ends 6 b and 6 b of the female thread of the sheath tube 6, respectively. The coupler 7 is a headed bolt-like member having a configuration in which a nut-like head 7b is attached to the tip of the male screw portion 7a. The coupler 7 is a hollow member having a through hole 7c extending in the axial direction, and the PC steel material 3 is inserted into the hollow member. The coupler 7 having such a structure is attached by the male screw portion 7a being screwed to both end portions 6b of the female screw-like sheath tube 6, and from the side surface of the joint portion 2a of the concrete column 2. It is attached in a protruding state. The protruding tip (head 7b) of the coupler 7 is in contact with the end plate 5 of the steel beam 1 arranged on the side of the concrete column 2, and the end plate 5 and the concrete column 2 ( A gap C having a predetermined width is secured between the side surface of the joint portion 2a). The gap C is filled with a filler 8 made of non-shrink mortar or the like, and the filler 8 is interposed between the end plate 5 and the side surface of the concrete column 2 (part 2a). It has become.

  The PC steel material 3 is inserted into the sheath tube 6 and the couplers 7 and 7 on both sides with a predetermined tensile force introduced. The PC steel material 3 is a tension material for applying prestress to the joint portion 2a of the concrete column 2, and is, for example, a steel bar made of high-tensile steel, a steel wire, a steel strand, or a steel wire or steel. A cable bundled with wires. Both end portions of the PC steel material 3 protrude from the tips of the couplers 7 and 7, respectively, are inserted into holes (not shown) formed in the end plates 5 and 5, and pass through the end plates 5 and 5, respectively. . Fixing tools 9 and 9 for gripping and fixing the end portions of the PC steel material 3 are respectively attached to both ends of the PC steel material 3 penetrating the end plates 5 and 5, and the PC steel material 3 has a tensile force. In the introduced state, both ends thereof are fixed to the steel beams 1 and 1, respectively.

  Further, below the end plates 5 and 5 of the steel beams 1 and 1 on both sides, beam receiving members 10 and 10 for supporting the steel beams 1 and 1 are respectively provided. The beam receiving member 10 is made of a steel material such as an angle steel extending along the lower side of the end plate 5, and is fixed to the side surface of the concrete column 2 by a plurality of bolts 11.

  Next, a method for constructing a joint structure between the steel beams 1 and 1 and the concrete column 2 having the above-described configuration will be described.

  First, the process of constructing the concrete pillar 2 at a predetermined position is performed. Specifically, the concrete pillar 2 made of precast concrete is disposed in a predetermined position and in a predetermined direction, and is joined to a lower pillar (not shown). In addition, a plurality of sheath tubes 6 are embedded in a predetermined position in the joint portion 2a of the concrete column 2 in advance.

  Next, the couplers 7 are respectively attached to both end portions 6b of the plurality of sheath tubes 6 formed in a female screw shape, and the steel beams 1 and 1 are respectively arranged on both sides of the joint portion 2a of the concrete column 2. A step of inserting the PC steel materials 3 into the plurality of sheath tubes 6 is performed. Specifically, first, couplers 7 are respectively screwed into both end portions 6b of the plurality of sheath tubes 6, and the tip surfaces of these couplers 7 are arranged at predetermined positions (desired positions of the end surfaces of the steel beam 1). In this manner, the degree of tightening of the plurality of couplers 7 is adjusted. On the other hand, the beam receiving members 10 are attached to both side surfaces of the joint portion 2a of the concrete column 2, respectively. Thereafter, the end plate 5 is placed on the beam receiving member 10 to support the steel beam 1, and the steel beams 1 and 1 are arranged on both sides of the concrete column 2. At this time, the end plates 5, 5 of the steel beams 1, 1 are brought into contact with the front end surfaces of the plurality of couplers 7. , 5 and the through holes 7c of the couplers 7 are aligned with each other to adjust the position of the steel beams 1, 1 in the lateral direction (horizontal direction orthogonal to the axial direction). The position of the steel beams 1 and 1 in the height direction is adjusted by adjusting the installation height of the beam receiving members 10 and 10. Thereafter, the PC steel materials 3 are inserted into a plurality of holes (not shown) of the end plates 5 and 5, respectively, and the PC steel materials 3 are inserted through the through holes 7c of the couplers 7 and the through holes 6a of the sheath tubes 6 respectively. .

Next, with the end plates 5 and 5 of the steel beams 1 and 1 being brought into contact with the tips of the plurality of couplers 7, respectively, a tensile force is introduced into the plurality of PC steel materials 3. The step of fixing both ends of the steel plate to the end plates 5 and 5 of the steel beams 1 and 1 is performed. Specifically, a fixing tool 9 is attached to one end portion of the PC steel material 3 protruding from one end plate 5, and a tension (not shown) is applied to the other end portion of the PC steel material 3 protruding from the other end plate 5. The apparatus is mounted, and the tensile force is applied to the PC steel material 3 by pulling the PC steel material 3 with the tensioning device. Then, when a predetermined tensile force is introduced into the PC steel material 3, the fixing tool 9 is attached to the other end of the PC steel material 3, and then a tension device (not shown) is removed from the PC steel material 3. This tension work is performed for each of the plurality of PC steel materials 3. As a result, prestress is applied to the joint portion 2 a of the concrete column 2, and the end plates 5, 5 of the steel beams 1, 1 on both sides are respectively crimped to the tip surface of the coupler 7 . In the above-described tensioning operation, the plurality of PC steel materials 3... May be strained one by one, or two or more PC steel materials 3.

  Next, the step of filling the fillers 8 and 8 into the gaps C and C formed between the side surface of the concrete column 2 (the joint portion 2a) and the end plates 5 and 5 of the steel beams 1 and 1 on both sides, respectively. I do. Specifically, a mold frame (not shown) that closes the gaps C and C is built around the end plates 5 and 5, and the filler is enclosed by the mold frame, the end plate 5, and the side surface of the concrete pillar 2. 8 is injected. Then, after the filled filler 8 is cured, a mold frame (not shown) is removed.

According to the joining structure of the steel beams 1 and 1 and the concrete column 2 having the above-described structure and the construction method thereof, when the tensile force is introduced into the PC steel material 3, the end plate 5 of the steel beams 1 and 1 has a tip. The reaction force from the end plates 5 and 5 is taken by a plurality of couplers 7 abutting 5, and the bearing pressure due to prestress is effectively transmitted to the concrete column 2 via the couplers 7 and the sheath pipe 6. Is done. For this reason, before the fillers 8 and 8 are filled in the gaps C and C formed between the end plates 5 and 5 of the steel beams 1 and 1 and the side surface of the concrete column 2, the tensile force is applied to the PC steel 3. Can introduce tension work. As a result, the process can be determined regardless of the filling and curing of the filler 8, and the construction period can be shortened.

  Further, the position of the steel beams 1 and 1 in the axial direction when the steel beams 1 and 1 are arranged on the side of the concrete column 2 is determined by the plurality of couplers 7. For this reason, the steel beams 1 and 1 can be positioned easily, thereby shortening the construction period.

  Further, since the beam receiving members 10 and 10 for supporting the steel beams 1 and 1 are provided below the steel beams 1 and 1, the steel frame when the steel beams 1 and 1 are arranged on the side of the concrete column 2 is provided. The vertical positions of the beams 1 and 1 are determined by the beam receiving members 10 and 10. For this reason, the steel beams 1 and 1 can be positioned easily, thereby shortening the construction period.

  Further, since the coupler 7 having the male screw portion 7a is attached by being screwed to the female screw-like end portion of the sheath tube 6, adjusting the degree of tightening of the coupler 7 makes it possible to The tip position is easily adjusted. Thereby, positioning of the axial direction position of the steel beam steel beams 1 and 1 can be performed easily.

  In addition, since the sheath pipes 6 made of hollow deformed steel bars are used, the stress of the joint portion 2a of the concrete column 2 that becomes the joint portion is embedded easily by burying the sheath pipes 6. This is advantageous for the yield strength of the joint portion 2a of the concrete column 2.

  As mentioned above, although embodiment of the joining structure of the steel beam and concrete body concerning the present invention, and its construction method was described, the present invention is not limited to the above-mentioned embodiment, and does not deviate from the meaning. The range can be changed as appropriate. For example, in the above-described embodiment, the concrete pillar 2 made of precast concrete is formed as the concrete body. However, the concrete body according to the present invention may be not only a pillar but also a wall or a beam. Specifically, it may be a joining structure in which a steel beam is joined to the wall surface of a concrete wall, or a joining structure in which a steel beam (eg, a small beam) is joined to a side surface of a concrete beam (eg, a large beam). May be. Moreover, the present invention is not limited to a concrete body made of precast concrete, and may be a concrete body constructed by a conventional construction method.

  In the embodiment described above, the steel beams 1 and 1 are disposed on both sides of the concrete column 2. However, the present invention is a case where the steel beam is disposed on one side of the concrete body. There may be. Further, according to the present invention, a plurality of steel beams extending in directions orthogonal to each other are respectively joined to a concrete column, and the steel beam is arranged in an L shape in plan view or a T shape in plan view around the concrete column. Alternatively, the steel beam may be arranged in a cross shape in plan view around the concrete column.

  In the embodiment described above, both ends of the PC steel material 3 are fixed by the fixing structure including the end plate 5, the coupler 7, and the fixing tool 9. However, in the present invention, one end portion of the PC steel material is used. May be fixed by a fixing structure similar to that of the above-described embodiment, and the other end of the PC steel material may be fixed by another fixing structure.

  Moreover, in above-mentioned embodiment, the both end surfaces of the sheath pipe | tube 6 are each open | released by the side of the concrete pillar 2, PC steel material 3 is installed in the state which penetrated the concrete pillar 2, and both ends of PC steel material 3 are In the present invention, only one end surface of the sheath tube is open to the side of the concrete column, and the PC steel material is not penetrated into the concrete body. The other end may be fixed inside the concrete body.

  Moreover, in above-mentioned embodiment, although the steel materials attached to the side surface of the concrete pillar 2 are used as the beam receiving materials 10 and 10 which support the steel beams 1 and 1, this invention is in places other than a concrete body. An attached beam receiving material may be used, and for example, a corbel (arm) spanned on a temporary scaffold or the like may be used.

  Further, in the above-described embodiment, the coupler 7 is screwed into the end portion of the sheath tube 6, but the present invention may be configured such that the coupler is press-fitted into the end portion of the sheath tube. Concavities and convexities that mesh with each other are formed on the inner peripheral surface of the end portion of the sheath tube and the outer peripheral surface of the base end portion of the coupler, and the coupler may be gripped stepwise on the sheath tube.

  In the embodiment described above, a hollow deformed steel bar having a through hole 6a at the center is used as the sheath tube 6. However, the present invention may be a sheath tube made of a material other than the hollow deformed steel bar. For example, a plastic sheath tube may be used.

  In the embodiment described above, the steel beam 1 is disposed after the coupler 7 is attached to the end of the sheath tube 6, and then the PC steel material 3 is inserted into the sheath tube 6 and the coupler 7. In the present invention, after the coupler is attached to the end of the sheath tube, the PC steel material may be inserted into the sheath tube or the coupler, and then the steel beam may be disposed. Alternatively, the PC steel material may be placed in the sheath tube. After insertion, the coupler may be attached to the end of the sheath tube while inserting the PC steel material into the coupler, and then the steel beam may be disposed.

  In the above-described embodiment, after applying a prestress to the joint 2a of the concrete column 2 by introducing a tensile force to the PC steel material 3, the end plates 5, 5 of the steel beams 1, 1 and the concrete column 2 are applied. Fillers 8 and 8 made of mortar or the like are filled between the side surfaces of the steel, but in the present invention, the space between the end surface of the steel beam and the side surface of the concrete body may remain hollow, and the filler is filled. It is good also as a structure which does not.

  In addition, in the present invention, the configuration in the above-described embodiment can be replaced with a known configuration without departing from the spirit of the present invention, and the above-described modified examples can be appropriately combined.

It is sectional drawing of the junction part of the steel beam and concrete body for demonstrating embodiment which concerns on this invention. It is sectional drawing between AA shown in FIG.

Explanation of symbols

1 Steel beam 2 Concrete pillar (concrete body)
3 PC steel 5 End plate (end of steel beam)
6 Sheath tube 7 Coupler 10 Beam receiving material

Claims (5)

Is installed PC steel concrete body, with a tensile force to the PC steel member is introduced, that the ends of the PC steel material, is fixed to the end portion of the steel beam which at least an end portion is made of steel, the PC The reaction force against the tensile force introduced into the steel material is transmitted to the concrete body through the end of the steel beam and prestress is applied to the concrete body, and the concrete body and the steel beam are joined together. In the joint structure between a steel beam and a concrete body,
Inside the concrete body, a sheath tube for inserting the PC steel material is embedded,
At the end of the sheath tube, a hollow coupler through which a PC steel material is inserted is attached to the end of the steel tube and the end is in contact with the end surface of the steel beam .
A steel beam and a concrete body , wherein a reaction force against a tensile force introduced into the PC steel material can be transmitted from an end surface of the steel beam to the concrete body through the coupler and the sheath tube. Bonding structure with. In the joining structure of the steel beam according to claim 1 and the concrete body,
A joining structure of a steel beam and a concrete body, wherein a beam receiving material for supporting the steel beam is provided below the steel beam. In the joining structure of the steel beam and concrete body according to claim 1 or 2,
A joining structure of a steel beam and a concrete body, wherein the coupler is attached by screwing the coupler into the end of the sheath tube. In the joining structure of the steel beam and the concrete body according to any one of claims 1 to 3,
A joining structure of a steel beam and a concrete body, wherein the sheath tube is made of a hollow deformed steel bar. Is installed PC steel concrete body, with a tensile force to the PC steel member is introduced, that the ends of the PC steel material, is fixed to the end portion of the steel beam which at least an end portion is made of steel, the PC The reaction force against the tensile force introduced into the steel material is transmitted to the concrete body through the end of the steel beam and prestress is applied to the concrete body, and the concrete body and the steel beam are joined together. In the construction method of the joint structure between the steel beam and the concrete body,
In advance, a sheath tube for inserting the PC steel material is embedded in the concrete body,
A hollow coupler through which the PC steel material is inserted is attached to the end of the sheath tube, and the steel beam is arranged on the side of the concrete body so that the end surface of the steel beam is brought into contact with the end of the coupler. The process of inserting the PC steel material into the
Thereafter, by introducing a tensile force to the PC steel material and fixing the end of the PC steel material to the end surface of the steel beam, a reaction force against the tensile force introduced to the PC steel material is transmitted from the end surface of the steel beam to the coupler and the A method for constructing a joint structure between a steel beam and a concrete body, wherein a step of applying prestress to the concrete body by transmitting to the concrete body via a sheath tube is performed.

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