JP2011122352A - Structure for joining beam and floor member together, structure with the same structure, and the floor member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the operation of joining a precast concrete floor slab and a steel-frame beam together. <P>SOLUTION: An L-shaped angle 20 is pre-fixed to the end surface of the floor slab 18 in a factory etc. The L-shaped angle 20 butts against a web 12A of the steel-frame beam 12, and they are fillet-welded together. Thus, the floor member 14 and the steel-frame beam 12 are joined together so that a shear force can be transferred. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a beam floor member joint structure, a structure having the beam floor member joint structure, and a floor member.

  Conventionally, a precast method for constructing a floor structure using a floor plate made of precast concrete (hereinafter referred to as “PCa”) is known. In this precast method, PCa floor boards manufactured in advance in a factory are transported to the site, and these PCa floor boards are laid on steel beams to construct a floor structure. Therefore, since there is no formwork or concrete placement work, the construction period can be shortened and the construction can be simplified compared to the on-site construction method.

  However, due to various factors, the PCa floor board is lowered with respect to the steel beam, and the PCa floor board may not be placed on the steel beam. For example, a water-proof portion is often provided on a PCa floor board in a water-surrounding area (restaurant, kitchen, laboratory, balcony, etc.). In this case, in consideration of the thickness of the waterproof layer, the PCa floor board in the water-surrounding area is attached to a position one step lower than the PCa floor board in other portions. Further, many unit baths in apartment houses or the like are provided with a bathtub at a position one step lower than the washing place. In this case, the PCa floor board on the bathtub side is attached to a position one step lower than the PCa floor board on the washing place side. Moreover, when installing the installation equipment with height, in order to ensure the installation height of installation equipment, the PCa floor board in which installation equipment is installed is attached to the position one step lower than the PCa floor board of another site | part. Furthermore, there is a step between adjacent steel beams, and the PCa floor board may not be installed horizontally between these steel beams.

  As described above, when the PCa floor plate cannot be placed on the steel beam, it is conceivable that a receiving member such as an angle or a flange is welded or bolted to the steel beam web and the PCa floor plate is placed on the receiving member. . For example, in Patent Document 1, a bracket is fixed to a web of an H-shaped steel beam with a bolt, and a floor panel plate is placed and fixed on an inverted T-shaped member fixed to the bracket with a bolt. Moreover, in patent document 2, the floor support metal fitting is fixed to the web of the H-shaped steel beam with the volt | bolt, and the floor panel for balconies is mounted in the said floor support metal fitting.

  However, in patent document 1, since a floor panel board is fixed to the inverted T-shaped material in the field, joining work becomes complicated. Similarly to Patent Document 1, in Patent Document 2, when the balcony floor panel is fixed to the floor support metal fitting, the joining work becomes complicated.

JP-A-8-218534 Japanese Utility Model Publication No. 6-37401

  An object of the present invention is to simplify the joining operation between a precast concrete floor board and a steel beam in consideration of the above facts.

  The beam floor member joining structure according to claim 1 is a steel beam having a vertical portion and horizontal portions provided at upper and lower end portions of the vertical portion, and a plate member provided on an end surface in the vertical portion. A floor plate made of precast concrete disposed in abutment, a fixing member fixed to the plate material and embedded in the floor plate, and a joining means for joining the plate material and the vertical portion.

  According to said structure, the board | plate material is provided in the end surface of the floor board made from precast concrete. This floor board is arranged with the plate material butted against the vertical part of the steel beam. The plate member is provided with a fixing member, and the plate member is fixed to the floor plate by embedding the fixing member in the floor plate. By joining this floor board to the vertical part of the steel beam by a joining means, the floor board and the steel beam are joined.

  Here, by fixing the plate material to the end face of the floor board in advance in a factory or the like, the work of fixing the floor board and the plate material at the site can be eliminated. Therefore, in the field, the floor plate and the steel beam can be joined by joining the plate member and the vertical portion of the steel beam by the joining means, so the joining work of the PCa floor plate and the steel beam is simplified. be able to.

  The beam floor member joining structure according to claim 2 is the beam floor member joining structure according to claim 1, wherein the joining means joins the upper end portion of the plate member and the vertical portion.

  According to said structure, a steel beam and a floor board are joined by welding the upper end part of a board | plate material, and the vertical part of a steel beam. Here, when bolt holes are formed in the plate material and the vertical portion, respectively, and the plate material and the vertical portion are joined by the bolts penetrating through these bolt holes, the bolt holes of the plate material and the bolt holes of the steel beam are provided with a predetermined accuracy. It is necessary to position with. On the other hand, the present invention eliminates the positioning work such as the aforementioned bolt hole by joining the upper end of the plate member and the vertical portion of the steel beam by welding. Further, by welding the upper end portion and the vertical portion of the plate material, that is, the plate material and the vertical portion can be joined not by upward welding but by downward welding. Therefore, the workability is improved.

  The structure according to claim 3 has the beam floor member joint structure according to claim 1 or claim 2.

  According to said structure, by having the beam floor member joining structure of Claim 1 or Claim 2, the joining operation | work of the floor board made from PCa and a steel beam can be simplified. Therefore, a structure with improved workability can be constructed.

  The floor member according to claim 4 is arranged by abutting a plate material provided on an end face to the vertical portion of a steel beam having a vertical portion and horizontal portions provided at upper and lower ends of the vertical portion. And a floor plate made of precast concrete to which the plate material is joined to the vertical portion, and a fixing member provided on the plate material and embedded in the floor plate.

  According to said structure, the board | plate material is provided in the end surface of the floor board made from precast concrete. This floor board is arranged with the plate material butted against the vertical part of the steel beam. The plate member is provided with a fixing member, and the plate member is fixed to the floor plate by embedding the fixing member in the floor plate. By joining this floor board to the vertical part of the steel beam by a joining means, the floor board and the steel beam are joined.

  Here, by fixing the plate material to the end face of the floor board in advance in a factory or the like, the work of fixing the floor board and the plate material at the site can be eliminated. Therefore, in the field, the floor plate and the steel beam can be joined by joining the plate member and the vertical portion of the steel beam by the joining means, so the joining work of the PCa floor plate and the steel beam is simplified. be able to.

  Since this invention was set as said structure, the joining operation | work of the floor board made from precast concrete and a steel beam can be simplified.

It is a perspective view showing a floor member and a steel beam to which a beam floor member joining structure according to an embodiment of the present invention is applied. It is a top view which shows the floor member and steel beam to which the beam floor member joining structure concerning embodiment of this invention was applied. FIG. 3 is a sectional view taken along line 2-2 of FIG. FIGS. 2A and 2B show a floor member and a steel beam to which a modification of the beam floor member joining structure according to the embodiment of the present invention is applied, and is a view corresponding to a sectional view taken along line 2-2 in FIG. It is. FIGS. 2A and 2B show a floor member and a steel beam to which a modification of the beam floor member joining structure according to the embodiment of the present invention is applied, and is a view corresponding to a sectional view taken along line 2-2 in FIG. It is. FIGS. 2A and 2B show a floor member and a steel beam to which a modification of the beam floor member joining structure according to the embodiment of the present invention is applied, and is a view corresponding to a sectional view taken along line 2-2 in FIG. It is. FIGS. 2A and 2B show a floor member and a steel beam to which a modification of the beam floor member joining structure according to the embodiment of the present invention is applied, and is a view corresponding to a sectional view taken along line 2-2 in FIG. It is. FIGS. 2A and 2B show a floor member and a steel beam to which a modification of the beam floor member joining structure according to the embodiment of the present invention is applied, and is a view corresponding to a sectional view taken along line 2-2 in FIG. It is. FIGS. 2A and 2B show a floor member and a steel beam to which a modification of the beam floor member joining structure according to the embodiment of the present invention is applied, and is a view corresponding to a sectional view taken along line 2-2 in FIG. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a steel beam 12 and a floor member 14 to which a beam floor member joining structure is applied. The steel beam 12 is made of H-shaped steel, and includes a web 12A (vertical portion) standing vertically or substantially vertically, and a flange 12B (horizontal portion) provided horizontally or substantially horizontally at the upper and lower ends of the web 12A. Have. The steel beam 12 is constructed between columns (not shown).

  A steel beam 16 parallel to or substantially parallel to the steel beam 12 is disposed on the side of the steel beam 12. The steel beam 16 is made of H-shaped steel, and has a web 16A standing upright or substantially vertically and a flange 16B disposed horizontally or substantially horizontally and provided at upper and lower ends of the web 16A. As shown in FIG. 3, the steel beam 16 is disposed at a position lower than the steel beam 12, and the upper flange 16 </ b> B is lower than the flange 12 </ b> B above the steel beam 12. The steel beam 16 is installed between columns (not shown) in the same manner as the steel beam 12.

  A plurality of floor members 14 are installed between the steel beam 12 and the steel beam 16. The floor member 14 includes a floor plate 18 made of PCa and an L-shaped angle 20 provided on an end surface of the floor plate 18. Each floor board 18 is formed in a block shape, and is arranged horizontally or substantially horizontally with the longitudinal direction as the installation direction (the direction of arrow A, which is hereinafter referred to as “support span direction”). One end of the floor plate 18 in the support span direction is placed on the flange 16B on the steel beam 16, and an L-shaped angle 20 provided on the end surface of the other end in the support span direction is abutted against the web 12A of the steel beam 12. Has been placed.

  As shown in FIG. 3, each floor board 18 has embedded therein a reinforcing bar 22 extending in the support span direction and a main bar 24 extending in a direction perpendicular to the distributing bar 22. The floor members 14 adjacent to the main reinforcement 24 direction (arrow B direction) are joined by a filler 26 (see FIG. 1) such as grout or mortar filled in the joint. The main bars 24 of the adjacent floor members 14 may be connected using a mechanical joint or the like so that a bending moment can be transmitted.

  A plurality (two in FIG. 1) of L-shaped angles 20 (plate materials) are provided on the end surface of each floor plate 18 on the steel beam 12 side. The L-shaped angle 20 is formed by bending a steel plate at a right angle or a substantially right angle, a web 20A that covers the end surface of the floor plate 18, and a flange that extends from the upper end of the web 20A toward the floor plate 18 and covers the upper surface of the floor plate 18. 20B, and straddles the end surface and the upper surface of the floor board 18. A stud 28 (fixing member) projects from the web 20A of the L-shaped angle 20. The stud 28 is embedded in the floor plate 18, and thereby the L-shaped angle 20 is fixed to the floor plate 18 so as to transmit a shearing force. The L-shaped angle 20 is preferably subjected to rust prevention treatment. Moreover, the L-shaped angle 20 should just be one or more.

  Here, the L-shaped angle 20 is fixed to the floor board 18 when the floor board 18 is manufactured. Specifically, the L-shaped angle 20 is installed in a formwork for producing the floor board 18 together with the distribution bar 22 and the main bar 24. By placing concrete in the mold, the stud 28 is embedded in the concrete and fixed. Thereby, the L-shaped angle 20 is fixed to the floor board 18 so that a shearing force can be transmitted. The fixing length between the stud 28 and the floor board 18 can be appropriately designed as necessary. Further, in place of the stud 28, a deformed bar, an anchor or the like may be used.

  The floor plate 18 is arranged with the web 20A of the L-shaped angle 20 abutted against the web 12A of the steel beam 12, and the bent portion of the L-shaped angle 20 at the upper end of the web 20A and the web 12A of the steel beam 12 are welded to the fillet. It is joined. Thereby, the floor board 18 and the steel beam 12 are joined so that a shearing force (in-plane shearing force) at all times and during an earthquake can be transmitted. In addition, various weldings, such as complete penetration welding and partial welding (partial penetration welding), can be used for welding. Moreover, the code | symbol W in a figure has shown the welding part.

  Next, the example of the construction method of the beam floor member junction structure concerning this embodiment is demonstrated.

  First, the L-shaped angle 20 fixed to the end surface of the floor member 14 is directed to the steel beam 12 side, and the floor member 14 is placed on the steel beam 16 and a supporting work (not shown). Next, the floor member 14 is moved toward the steel beam 12 side, the end of the floor plate 18 is inserted between the upper and lower flanges 12B of the steel beam 12, and the web 20A of the L-shaped angle 20 is moved to the web of the steel beam 12. Match 12A. Next, the bent portion of the L-shaped angle 20 and the web 12A of the steel beam 12 are fillet welded. By repeating this procedure, a plurality of floor plates 18 are installed between the steel beam 12 and the steel beam 16. And the filler 26 is filled and joined to the joint between the floor boards 18 adjacent to the direction of the main reinforcement 24 (arrow B direction).

  As described above, in the beam floor member joining structure according to the present embodiment, the floor member 14 and the steel beam 12 are welded by abutting the L-shaped angle 20 fixed to the end face of the floor plate 18 against the web 12A of the steel beam 12. And join. Therefore, even if the floor member 14 cannot be placed on the flange 12B, which is the top end of the steel beam 12, the floor plate 18 and the steel beam 12 can be joined. Further, by fixing the L-shaped angle 20 to the end face of the floor plate 18 in advance at a factory or the like, it is possible to eliminate the work of fixing the floor member 14 and the L-shaped angle 20 at the site. Therefore, the joining work of the floor plate 18 made of PCa and the steel beam 12 at the site can be omitted. Therefore, a structure with improved workability can be constructed.

  9, when the steel plate 56 provided on the end surface of the floor plate 18 and the web 12A of the steel beam 12 are joined with the bolt 62 and the nut 64, the bolt of the steel plate 56 is used. Although the hole and the bolt hole of the web 12A must be positioned with a predetermined accuracy, in this embodiment, the L-shaped angle 20 and the web 12A of the steel beam 12 are joined by welding. And the steel beam 12 can be joined. Further, by welding the bent portion of the L-shaped angle 20 at the upper end of the web 20A and the web 12A of the steel beam 12, that is, not by upward welding but by downward welding, the web of the L-shaped angle 20 and the steel beam 12 is used. Since 12A can be joined, workability improves.

  Furthermore, by covering the end surface and the upper surface of the floor board 18 with the L-shaped angle 20, damage and damage to the end of the floor board 18 can be reduced.

  Next, a modification of this embodiment will be described.

  As shown in FIG. 4A, the floor member 30 is disposed with the L-shaped angle 20 abutted against the lower part of the web 12 </ b> A of the steel beam 12. A notch 32 is formed in the lower surface of the end portion in the support span direction of the floor plate 18, and the flange 12 </ b> B below the steel beam 12 is disposed in the notch 32.

  Thus, by arranging the flange 12B of the steel beam 12 in the notch 32 provided on the lower surface of the floor plate 18, the floor member 14 can be joined to the lower portion of the web 12A of the steel beam 12. Therefore, the freedom degree of the joining position of the floor member 14 and the steel beam 12 improves.

  Further, as shown in FIG. 4B, the floor member 34 is disposed so that the L-shaped angle 20 is abutted against the upper part of the web 12 </ b> A of the steel beam 12. The L-shaped angle 20 is provided across the end surface and the lower surface of the floor plate 18, and is welded to the web 12 </ b> A of the steel beam 12 at the bent portion at the lower end of the L-shaped angle 20.

  As described above, the L-shaped angle 20 is provided across the end surface and the lower surface of the floor plate 18, and the L-shaped angle 20 is fillet welded to the web 12 </ b> A of the steel beam 12 from the lower side of the floor member 34. Can be brought close to the flange 12B on the steel beam 12, and the floor member 14 and the steel beam 12 can be joined. Therefore, the freedom degree of the joining position of the floor member 14 and the steel beam 12 improves.

  Further, the L-shaped angle 20 only needs to secure a welded portion between the steel beam 12 and the web 12A. For example, as in the floor member 35 shown in FIG. A shaped angle 36 (plate material) may be used. Furthermore, a thick steel plate 38 (plate material) may be used instead of the L-shaped angle 36 as in the floor member 37 shown in FIG.

  Further, a C-shaped steel 40 (plate material) may be used instead of the L-shaped angle 20 as in the floor member 39 shown in FIG. The C-shaped steel 40 has a web 40A and flanges 40B provided at upper and lower ends of the web 40A, and is provided across the upper surface, end surface, and lower surface of the floor plate 18. A stud 28 protrudes from the web 40 </ b> A of the C-shaped steel 40, and the C-shaped steel 40 is fixed to the floor plate 18 so as to transmit a shearing force by embedding the stud 28 in the floor plate 18. The floor members 14 are joined to the steel beam 12 by welding the bent portions at the upper and lower ends of the web 40A of the C-shaped steel 40 to the web 12A of the steel beam 12 respectively.

  In this way, by joining fillet welds of the upper and lower bent portions of the C-shaped steel 40 and the web 12A of the steel beam 12, not only shearing force but also bending moment can be joined. Further, by covering the upper surface, end surface, and lower surface of the floor plate 18 with the C-shaped steel 40, breakage and damage of the end portion of the floor plate 18 can be reduced.

  Moreover, the stud 28 should just be able to fix the L-shaped angle 20 to the floor board 18, and the number and arrangement | positioning are not restricted to what was mentioned above. For example, a stud 28 may protrude from the flange 20B of the L-shaped angle 20 like a floor member 41 shown in FIG.

  In addition, in said embodiment, although the junction structure of the floor member 14 and the steel beam 12 which consists of H-shaped steel was demonstrated to the example, it is not restricted to this. For example, as shown in FIGS. 7A and 7B, the present invention can also be applied to a joining structure of a steel beam 42 made of C-shaped steel and the floor member 14. The steel beam 42 has a web 42A (vertical portion) that stands vertically or substantially vertically, and a flange 42B (horizontal portion) that is provided horizontally or substantially horizontally at the upper and lower ends of the web 42A. A web 20A having an L-shaped angle 20 provided on the end face of the floor board 18 is abutted against the web 42A. 7A, the L-shaped angle 20 is fillet welded to the inner surface of the web 42A of the steel beam 42. In FIG. 7B, the L-shaped angle 20 is applied to the outer surface of the web 42A of the steel beam 42. Is fillet welded.

  Furthermore, as shown in FIG. 8A, the present invention can also be applied to a joining structure of a steel beam 44 made of a square steel pipe and a floor member 14. The steel beam 44 includes a side wall 44A (vertical portion) standing vertically or substantially vertically, an upper wall 44B (horizontal portion) and a lower wall 44C (horizontal portion) provided horizontally or substantially horizontally at the upper and lower ends of the side wall 44A. Part). A web 20A having an L-shaped angle 20 provided on the end surface of the floor plate 18 is abutted against the side wall 44A and is fillet welded.

  Further, as shown in FIG. 8B, the present invention can also be applied to a joint structure between a steel beam 46 made of CFT (Concrete Filled Steel Tube) and the floor member 14. The steel beam 46 includes a square steel pipe 48 and a concrete 50 filled in the square steel pipe 48. The square steel pipe 48 includes a side wall 48A (vertical portion) standing vertically or substantially vertically, and an upper wall 48B (horizontal portion) and a lower wall 48C (horizontal portion) provided horizontally or substantially horizontally at the upper and lower ends of the side wall 48A. Part). The square steel pipe 48 is filled with concrete 50, and a beam reinforcing bar 52 and a shear reinforcing bar 54 are embedded in the concrete 50. A web 20A of an L-shaped angle 20 provided on the end surface of the floor board 18 is abutted against the side wall 44A. In addition, although illustration is abbreviate | omitted, a steel frame beam may be I-section steel, cross I-section steel, etc.

  Moreover, in the said embodiment, although the L-shaped angle 20 and the web 12A of the steel beam 12 were weld-joined, you may bolt-join. Specifically, like the floor member 55 shown in FIG. 9, the floor member 30 is disposed by abutting a steel plate 56 provided on the end face against the web 12 </ b> A of the steel beam 12. A stud 28 protrudes from the steel plate 56, and the steel plate 56 is fixed to the floor plate 18 so that shear force can be transmitted by embedding the stud 28 in the floor plate 18.

  Bolt holes (not shown) are respectively formed in the upper part of the steel plate 56 extending above the floor plate 18 and the web 12A of the steel beam 12. The steel plate 56 and the web 12A of the steel beam 12 are joined so as to be able to transmit a shearing force by means of bolts 62 and nuts 64 that are penetrated through these bolt holes as joining means. Thereby, the floor member 55 and the steel beam 12 are joined. Thus, by joining the steel plate 56 and the web 12A of the steel beam 12 with the bolt 62 and the nut 64, the floor member 55 and the steel beam 12 can be easily attached and detached. Dismantling becomes easy.

  Further, in the present embodiment, the case where the beam floor member joining structure is applied to the end portion of the floor member 14 in the direction of the distribution bar 22 (the arrow A direction in FIG. 1) has been described as an example. You may apply to the edge part of the main reinforcement | strength 24 direction (arrow B direction in FIG. 1). Here, generally, a bending moment generated in the floor member 14 is transmitted to peripheral members (for example, adjacent floor members and beams) mainly through the main bars 24, and the bending moment is transmitted to the distribution bars 22. Is not expected. Therefore, the joint stress between the end of the floor member 14 in the direction of the reinforcing bar 22 and the steel beam 12 is more stressed than the joint between the end of the main member 24 of the floor member 14 and the steel beam 12. Get smaller. Therefore, it is desirable that the above-described embodiment be applied to the joining between the steel beam 12 and the end of the floor member 14 in the direction of the distribution bar 22 where the required joining strength is small.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

12 Steel beam 12A Web (vertical part)
12B Flange (horizontal part)
18 Floor 20 L-shaped angle (plate)
36 L-shaped angle (plate material)
38 Steel plate
40 C-shaped steel 42 Steel beam 42A Web (vertical part)
42B Flange (horizontal part)
44 Steel beam 44A Side wall (vertical part)
44B Upper wall (horizontal part)
44C Lower wall (horizontal part)
46 Steel beam 48A Side wall (vertical part)
48B Upper wall (horizontal part)
48C Lower wall (horizontal part)
56 Steel plate
62 bolts (joining means)
64 Nut (joining means)
W welded part (joining means)

Claims (4)

A steel beam having a vertical part and a horizontal part provided at the upper and lower ends of the vertical part;
A floor plate made of precast concrete, which is arranged by abutting a plate material provided on an end face with the vertical portion;
A fixing member fixed to the plate material and embedded in the floor plate;
A joining means for joining the plate member and the vertical portion;
Beam floor member joining structure comprising.   The beam floor member joining structure according to claim 1, wherein the joining means is welding for joining the upper end portion of the plate member and the vertical portion.   The structure which has a beam floor member junction structure of Claim 1 or Claim 2. A plate provided on the end face is abutted against the vertical portion of the steel beam having a vertical portion and horizontal portions provided at the upper and lower ends of the vertical portion, and the plate is joined to the vertical portion. Precast concrete floorboard,
A fixing member provided in the plate material and embedded in the floor plate;
A floor member comprising:

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