JP4447632B2 - Beam and beam-column joint structure and method of joining the same - Google Patents

Description

  The present invention relates to a beam, a bonded structure of a beam and a column, and a bonding method thereof.

As shown in FIG. 13, a conventional method of joining a beam and a column is to install a steel beam 43 on a beam coupling jaw 42 of a column 41 and connect the steel beam 43 to the column 41 (a steel beam and a column). 44) The joint mortar 45 was filled in 44, and after the joint mortar 45 was hardened, a predetermined prestress was applied by the PC steel material 46. As another method of joining a beam and a column, for example, the invention of Japanese Patent Application Laid-Open No. 2006-188864 is known.
JP 2006-188864 A

  However, the above-described method of joining the beam and the column is that the joint mortar filled in the joint between the steel beam and the column (between the steel beam and the column) is hardened, and then a predetermined prestress is applied with the PC steel material. Since it was joined, there was a problem that the beam could not be joined until the joint mortar was cured.

  The present invention has been made in view of these problems, and an object of the present invention is to provide a beam capable of joining a beam to a column without being influenced by the hardening of joint mortar, a beam-column junction structure, and a method for joining the beam. It is to be.

The beam for solving the above problems is provided with joining end portions on both sides of the steel beam material. The joining end portions are a lower joint member of a concrete body and a steel frame installed on the upper surface of the lower joint member. The steel member is narrower than the lower joint member, and the tip of the steel member protrudes from the tip of the lower joint member, and the upper portion of the stirrup from the upper surface of the lower joint member on both sides of the steel member And the upper part of the stirrup is arranged up to the steel member . In addition, an external cable is wired on the steel beam material, and prestress is applied by the external cable.
Further, in the beam-column joining structure, the beam according to any one of claims 1 and 2 is installed on the beam-joining jaw of the column via a joining end portion, and the joining end portion is connected to the column from the joining end portion. It is characterized in that it is joined with a PC steel material disposed over the bottom and concrete is cast on the lower joining members on both sides of the steel member. Further, the PC steel material includes being disposed above the center of the cross section of the beam. In addition, the joining end portion includes being joined to the column via the bearing plate.
Further, the beam and the column can be joined by installing the beam according to any one of claims 1 and 2 on the beam-joining jaw of the column via the joining end, and arranging the beam between the joining end and the column. After the steel material is tensioned with a predetermined force, concrete is placed on the lower joint members on both sides of the steel member. In addition, a bearing plate is interposed at the joint between the beam end and the column.
Further, the beam and the column are joined by laying the beam according to any one of claims 1 and 2 on the beam-joining jaw of the column via the joining end, and arranging the PC steel material between the joining end and the column. After the installation, concrete is placed on the lower joint members on both sides of the steel frame member, and after the concrete is hardened, the PC steel material is tensioned with a predetermined force. In addition, a bearing plate is interposed at the joint between the beam end and the column.

  The beam which can join the edge part for joining to a column with PC steel materials can be provided. In addition, the end of the beam for joining to the column is eccentric to the end of the beam by joining it with the PC steel placed above the center of the cross section (placed where the PC steel is eccentric from the center of the cross section of the beam). A bending moment is generated, and the central portion in the length direction of the beam can be peeled upward. In addition, since the central portion in the longitudinal direction of the beam can be turned upward to reduce the bending moment that always acts on the central portion, the span of the beam can be increased. In addition, by placing concrete in the slab with the beam's center in the longitudinal direction facing upward, even when a long-term load is applied, the center in the beam's length is kept in compressive stress. And the occurrence of cracks can be prevented. Moreover, the PC steel material can be immediately tensioned by joining the end part for joining of the beam to the column via the bearing plate. As in the prior art, the end portions for joining the beams can be joined without waiting for the hardening of the joint mortar filled in the joint between the beams and the columns.

  Embodiments of a beam, a beam-column connection structure, and a method for connecting the beam according to the present invention will be described below with reference to the drawings. First, the beam will be described, then the beam-column connection structure will be described, and then the beam-column connection method will be described. In the embodiments, the same components are described with the same reference numerals, and only different components are described with different reference numerals.

  1-4 is the beam 1 of 1st Embodiment, This beam 1 is comprised from the steel beam material 2 and the edge part 3 for joining installed in the both ends. The beam 1 is characterized by the joining end portions 3 installed on both sides of the steel beam material 2. This steel beam material 2 is an H-shaped steel, stud bolts 5 are installed on the upper flange 4 at appropriate intervals, end plates 6 installed at both ends in the length direction are connected to the end plate 3 for the joining end 3. 17 is joined by a bolt 7 and a connecting plate 18.

  The joining end 3 is installed on the beam joining jaw of the column, and includes a lower joining member 8 and a steel member 9 installed on the upper surface thereof. The lower joining member 8 is formed by projecting part of the star wrap 11 from both sides of the upper surface of the precast concrete body 10 having the same width and the same thickness as the beam joining jaw. The lower joining member 8 can be manufactured not only with a precast concrete body but also with cast-in-place concrete.

  The upper portion of the stirrup 11 is cut at a predetermined width, and the cut upper portion is spot-welded to the upper flange 4 of the steel member 9 installed therebetween. In addition, the stirrup 11 can also be arranged on the upper flange 4 of the steel member 9 in a ring shape without cutting the upper portion as described above. That is, the steel member 9 is installed below the stirrup 11.

  The steel member 9 is H-shaped steel having the same width as the steel beam member 2 and is narrower than the lower joint member 8, but is longer than the lower joint member 8. When the anchor bolt 12 is used to secure the tip of the precast concrete body 10 to the tip surface 13 of the precast concrete body. Thus, this becomes the latching portion 14 installed on the upper surface of the beam-joining jaw, and the latching portion 14 and the tip surface 13 of the precast concrete body form a fitting portion 15 that fits the beam-joining jaw.

  On the upper flange 4 of this steel frame member, stud bolts 5 are installed at appropriate intervals in the same manner as the steel beam material 2, and a column end plate 16 is installed at the front end, and a beam is installed at the rear end. An end plate 17 is installed. The end plate 17 has the same length as the end plate 6 of the steel beam member 2 and extends to the lower end of the rear surface of the precast concrete body 10 which is a lower joint member.

  The column end plate 16, the beam end plate 17, and the steel beam end plate 6 have an upper insertion hole 19 into which the upper PC steel material is inserted, and the precast concrete body 10 as the lower joint member 8 and the steel beam. A lower insertion hole 20 for inserting the lower PC steel material is also opened in the material end plate 6.

  In this way, the steel member 9 made of H-shaped steel is placed on the upper surface of the precast concrete body 10, and the lower flange 21 is fixed with the anchor bolt 12 to form the joining end 3. This joining end 3 Since the beam 1 of the present invention can be formed by connecting to the steel beam member 2 with the bolt 7, the beam 1 can be easily assembled at the factory or the site.

  FIG. 5 shows a beam 22 according to the second embodiment. This beam 22 is obtained by applying prestress to the steel beam material 2 with an external cable 23. Otherwise, the beam 22 according to the first embodiment. 1 is the same configuration. Due to this prestress, the steel beam member 2 can be peeled upward at the center in the length direction.

  The beams 1 and 22 of the first and second embodiments are arranged with the stirrup 11 protruding from the lower joint member 8. However, the beams without the stirrup 11 are arranged. It can also be formed.

  Next, a beam-column junction structure (hereinafter referred to as a junction structure) using the beam 1 of the first embodiment will be described. 6 and 7 show the joint structure 24 of the first embodiment, which is intended for the pillar 25 located inside the building.

  In this joining structure 24, the beam 1 is installed on the beam joining jaw 26 on the four side surfaces of the column 25 via the joining end 3, and the joining ends 3 of the beams installed opposite to each other are PC steel materials 27, 28. It is joined and configured. This column 25 is a precast concrete column or a steel pipe concrete column to which prestress is applied, and a beam-joining jaw 26 protrudes from a joint portion of the beam.

  A bearing plate 29 is installed from the upper surface of the beam joining jaw 26 to the side of the column, and the joining end 3 is installed through the bearing plate 29 and the joint mortar 30. That is, the latching portion 14 of the steel member 9 is installed on the upper surface of the beam joint jaw 26 via the bearing plate 29, and the front end surface 13 of the precast concrete body is disposed on the front surface of the beam joint jaw 26 via the joint mortar 30. , The fitting portion 15 including the front end surface 13 of the latching portion 14 and the precast concrete body is fitted to the beam joining jaw 26, and the joining end portion 3 excluding the bearing plate 29 and the column 25 are fitted. The joint mortar 30 is filled in between the two (the joint between the joining end 3 and the column 25).

  On the upper surface of the lower joint member 8 on both sides of the steel member 9, a cast-in-place concrete 31 is placed so as to cover the stirrup 11, and this is placed so as to be flush with the upper surface of the upper flange 4. A joining member 32 is formed. Therefore, the upper joint member 32 includes the precast concrete body 10 as the lower joint member 8, the steel member 9 installed on the upper surface, and the cast-in-place concrete cast on the upper surface of the precast concrete body on both sides of the steel member 9. 31.

  Then, the upper PC passes through the column 25 from the upper insertion hole 19 of the upper joining member 32 in the joining end 3 of one beam and passes into the upper insertion hole 19 of the upper joining member 32 in the joining end 3 of the opposite beam. A steel material (PC steel strand, PC steel wire, PC steel rod and strand cable) 27 is disposed, and a predetermined prestress is applied to the upper PC steel material 27 so that the upper joining members 32 are joined together.

  The upper PC steel material 27 is thus arranged above the central portion of the cross section of the beam 1 (disposed at a location where the PC steel material is eccentric from the central portion of the cross section of the beam). Is generated, and the central portion of the beam in the longitudinal direction can be peeled upward, and the concrete 33 of the slab is placed in the state of being peeled upward. In addition, this upper PC steel material 27 can also be arrange | positioned in the cross-sectional center part of the beam 1 instead of the location eccentric in this way.

  Further, the lower insertion hole 20 of the lower joint member 8 at the joining end 3 of the opposite beam passes through the column 25 from the lower insertion hole 20 of the lower joining member 8 at the joining end 3 of the one beam. A PC steel material (PC steel strand, PC steel wire, PC steel bar, and strand cable) 28 is disposed. The lower PC steel material 28 is arranged with a predetermined force or is not tensed at all.

  Since the upper PC steel material 27 and the lower PC steel material 28 are arranged from the end plate 6 of one steel beam material to the end plate 6 of the other steel beam material facing each other, the steel material 2 and the steel material 2 are joined. In addition to functioning to join the end 3, the steel beam material 2 is joined to the column 25 via the joining end 3. That is, the beam 1 is joined to the column 25 so as to sandwich the joining end 3.

  FIG. 8 and FIG. 9 show the beam / column joint structure 34 according to the second embodiment, which is intended for a column located outside the building. In this beam-column connecting structure 34, the beam 1 is installed on the beam bonding jaw 26 on the three side surfaces of the column 25 via the bonding end 3, and the beam-bonding ends 3 facing each other are connected to each other by the PC. They are joined by steel materials 27 and 28. Except that the beam 1 is erected on the three side surfaces of the column 25 as described above, the configuration is the same as the above-described beam-column junction structure 24.

  FIG. 10 shows a beam-column joint structure 35 according to the third embodiment. This beam-column joint structure 35 connects the lower PC steel material 28 to the lower joint from the upper surface of the upper joint member 32 in one beam. The member 8 and the column 25 are arranged from the lower joint member 8 to the upper surface of the upper joint member 32 in the other beam opposite to each other, and the other portions are joined to the beam and the column of the first embodiment. The structure is the same as that of the structure 24.

  FIG. 11 shows a beam-column connection structure 36 according to the fourth embodiment. This beam-column connection structure 36 is intended for a column located outside the building. This is the same configuration as the beam-column joint structure 35 of the embodiment.

  Next, a joining method will be described based on the beam-column joining structure 24 of the first embodiment. First, the beam 1 of the first embodiment as shown in FIGS. 1 and 2 is assembled and formed. As shown in FIG. 4, the steel member 9 is fixed to the upper surface of the precast concrete body 10 with anchor bolts 12. Next, when the upper portion of the stirrup 11 is spot-welded to the lower side of the upper flange 4 of the steel member 9, the joining end portion 3 as shown in FIG. 3 is formed.

  Next, the joining end 3 is installed on the steel beam member 2. When the beam end plate 17 of the steel member is joined to the end plate 6 of the steel beam member with the bolt 7, as shown in FIGS. 1 and 2. A beam 1 having joining end portions 3 installed on both sides of a steel beam member 2 is formed.

  Next, this beam joining end 3 is placed on the beam joining jaw 26 of the column, and the beam 1 is installed between the columns. Since the bearing plate 29 is installed from the upper surface of the beam joining jaw 26 to the side surface of the column, the joining end 3 is installed on the beam joining jaw 26 through the bearing plate 29.

  Next, as shown in FIG. 7, an upper PC steel material 27 is disposed. This is through the column 25 from the upper insertion hole (opened in the column end plate of the steel member, the end plate for the beam and the end plate of the steel beam material) 19 in the joining end 3 of one beam, It arrange | positions in the upper insertion hole (same as the above) 19 in the joining edge part 3 of the beam which opposes. The upper PC steel material 27 is disposed on both sides of the steel member web 37 made of H-shaped steel, that is, between the stirrup 11 and the web 37.

  Next, the lower PC steel material 28 is disposed. This is because the lower insertion hole 20 (steel member) of the lower joining member 8 at the joining end 3 of the opposite beam passes through the column 25 from the lower insertion hole 20 of the lower joining member 8 at the joining end 3 of one beam. The end plate for the beam, the end plate of the steel beam material, and the one opened to the precast concrete body) 20. At this time, as shown in FIG. 12 (1), the beam 1 is installed on the beam joining jaw 26 on the four side surfaces of the column 25 via the joining end 3.

  Next, since the bearing plate 29 is interposed in the joint part 39 between the column and the beam, the upper PC steel material 27 is tensioned and fixed with a predetermined force without filling the joint mortar 30 in the joint part 39, Prestress is applied and the joining end 3 is joined to the column 25. The lower PC steel 28 is also tensioned with a predetermined force (a weaker force than the upper PC steel). In addition, this lower PC steel material 28 does not need to be tense.

  By arranging the upper PC steel material 27 above the center of the cross section of the beam (located at a location where the PC steel material is eccentric from the center of the cross section of the beam), an eccentric bending moment is generated at the end of the beam. The central part in the longitudinal direction of the beam can be peeled upward. The joint mortar 30 is filled between the joining end 3 and the column 25.

  Next, as shown in (2) of FIG. 12, in-situ concrete 31 is placed on both sides of the steel member 9 in order to form the upper joint member 32. Assemble the formwork 38. Then, a slab deck plate 40 is installed in the mold, and the cast-in-place concrete 31 is placed in the upper surface of the deck plate 40 and in the mold 38 to form the slab 33 and the upper joint member 32. Then, after the concrete 31 is hardened, the formwork 38 is disassembled, and the beam-column joint structure 24 is completed with the beam 1 facing upward.

  On the other hand, as another embodiment, after placing the cast-in-place concrete 31 forming the slab 33 and the upper joint member 32, the upper PC steel material 27 can be tensioned. This is because the beam 1 is installed on the beam-joining jaws 26 on the four side surfaces of the column 25 via the joining end portions 3, and the upper PC steel material 27 and the lower PC steel material 28 are disposed on each joining end portion 3. The joint mortar 30 is filled between each joining end 3 and the column 25.

  Next, a mold frame 38 for forming the upper joint member 32 is assembled and formed, a slab deck plate 40 is installed in the mold frame, and the cast-in-place concrete 31 is placed on the upper surface of the deck plate 40 and in the mold frame 38. To form the slab 33 and the upper joining member 32.

  After the concrete 31 is hardened, the disassembly of the formwork 38 and the upper PC steel material 27 are tensioned with a predetermined force to complete the beam-column joint structure 24. Also, the lower PC steel material 28 can be tensioned with a predetermined force (a weaker force than the upper PC steel material) or may not be tensioned.

  The beam-column joining method using the beam 22 of the second embodiment and the beam-column joining structures 24, 34, 35, 36 in the second to fourth embodiments are the same method as described above. It joins by.

It is a beam of a 1st embodiment, (1) is a front view, (2) is an AA line sectional view of (1), and (3) is the BB line sectional view. It is a top view of the beam of a 1st embodiment. It is a perspective view of the edge part for joining of the beam of a 1st embodiment. It is the edge part for joining of the beam of 1st Embodiment, (1) is a disassembled perspective view, (2) is the perspective view. It is a beam of 2nd Embodiment, (1) is a front view, (2) is CC sectional view taken on the line of (1), (3) is DD sectional view taken on the line. It is a top view of the joint structure of a beam and a column of a 1st embodiment. 1 is a cross-sectional view of a beam and a column according to the first embodiment, (1) is a cross-sectional view, (2) is a cross-sectional view taken along line EE of (1), and (3) is a cross-sectional view taken along line FF. is there. It is a top view of the junction structure of a beam and a column of a 2nd embodiment. It is sectional drawing of the junction structure of the beam and column of 2nd Embodiment. It is sectional drawing of the junction structure of the beam and column of 3rd Embodiment. It is sectional drawing of the junction structure of the beam and column of 4th Embodiment. It is the joining method of the beam and the column of 1st Embodiment, (1) is a perspective view, (2) is sectional drawing which laid the cast-in-place concrete of the upper joining member. It is sectional drawing of the conventional junction structure of a beam and a column.

Explanation of symbols

1, 22 and 43 Beam 2 Steel member 3 Joining end 4 Upper flange 5 Stud bolt 6 End plate 7 Bolt 8 Lower joining member 9 Steel member 10 Precast concrete body 11 Star wrap 12 Anchor bolt 13 End face 14 Hook 15 Mating portion 16 End plate for column 17 End plate for beam 18 Connecting plate 19 Upper insertion hole 20 Lower insertion hole 21 Lower flange 23 Outer cable 24, 34, 35, 36 Joint structure 25, 41 Column 26, 42 Beam joint jaw 27, 46 Upper PC steel 28 Lower PC steel 29 Bearing plate 30, 45 Joint mortar 31 Cast-in-place concrete 32 Upper joint member 33 Slab concrete 37 Web 38 Mold 39, 44 Joint 40 Deck plate

Claims (8)

End portions for joining are installed on both sides of the steel beam material. The joining end portions are composed of a lower joint member of a concrete body and a steel member installed on the upper surface of the lower joint member, and the steel member is joined to the lower portion. It is narrower than the member, and its tip part protrudes from the tip of the lower joint member, and the upper part of the star wrap projects from the upper surface of the lower joint member on both sides of the steel member, and the upper part of the star wrap is the steel member beam, characterized in that it is reinforcement to a. The beam according to claim 1 , wherein an outer cable is wired on the steel beam material, and prestress is applied to the outer beam. The beam according to any one of claims 1 and 2 is installed on a beam-joining jaw of a column via a joining end, and the joining end is joined by a PC steel material disposed from the joining end to the column. A beam-column connection structure characterized in that concrete is cast on lower joint members on both sides of a steel member. The joint structure of a beam and a column according to claim 3 , wherein the PC steel material is disposed above the center of the cross section of the beam. The beam-column joining structure according to claim 3 or 4 , wherein the joining end portion is joined to the column via a bearing plate. After laying the beam according to any one of claims 1 and 2 on a beam-joining jaw of a column via a joining end, and tensioning the PC steel material arranged between the joining end and the column with a predetermined force A method of joining a beam and a column, wherein concrete is cast on lower joint members on both sides of the steel member. The beam according to any one of claims 1 and 2 is installed on the column beam-joining jaw via the joining end portion, and after the PC steel material is disposed between the joining end portion and the column, the beam is formed on both sides of the steel member. A method of joining a beam and a column, wherein concrete is placed on a lower joining member, and the PC steel material is tensioned with a predetermined force after the concrete is hardened. The method of joining a beam and a column according to claim 6 or 7 , wherein a bearing plate is interposed at the junction between the beam end and the column.

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