JP5035984B2 - Joint structure of precast floor slab and beam - Google Patents

Description

  The present invention relates to a joint structure between a precast floor slab and a beam mainly employed in a steel structure (S structure).

  When constructing a steel structure (S structure) or a reinforced concrete structure (RC structure), there are a method of constructing concrete on-site and a method of pre-fabricating precast concrete members in advance and bringing them into the site for assembly. Broadly divided.

  The precast method requires rapid construction because the main structural members such as columns, beams, and floor slabs are manufactured at the factory as described above, and these can be carried to the site and assembled to greatly improve construction efficiency. In this case, many of the latter precast methods have been adopted, and recently, many of them have been adopted for high-rise apartments with more than 30 floors.

  When the precast method is adopted, the so-called full precast method for producing a precast member as a solid cross section and the beam is produced in a U-shape if it is a beam, and a reinforcing bar is placed on the inside to fill the concrete. There is a half-precast method, and in reality, these are used properly in consideration of these advantages and disadvantages, but in any case, as long as they are assembled on site, joining of precast members is inevitable.

  Here, since a large bending moment is generated at the joint between the main structural members, especially during an earthquake, how to construct such a joint is the biggest issue for securing earthquake resistance in the precast method. However, it is not an exaggeration, and many proposals have been made.

  For example, Patent Document 1 states that “a portion from the edge of the pair of PC floor plates is placed on the steel beam 4 so that a placement space Sp1 is formed between the end surfaces of the side portions B of the PC floor plates facing each other. The joint portions 12a1 of a large number of joint reinforcing bars 12a that are placed and embedded at intervals in each PC floor board are projected from the corrugated end face of the side B into the space Sp1, and one PC floor board 10 The joining portion 12a1 and the joining portion 12a1 of the other PC floor board are brought close to and substantially parallel to each other, the substantially parallel joining portions 12a1 are joined to each other, and the stud Sd1 having a head on the upper surface of the steel beam. A PC floor board fixing method is disclosed, in which a large number of pipes are planted at intervals, and concrete is placed in a placement space to join a steel beam and each PC floor board.

  Patent Document 2 states that “a pair of full PC floor plates 10 are placed on the beam 2 so that a placement space Sp1 is formed between the sides, and the reinforcing bars of one floor plate 10 are placed in the space Sp1. The connecting portion 12b1 of the other floor plate and the connecting portion 12b1 of the reinforcing bar of the other floor board 10 are close to each other and parallel to each other, and one steel sleeve Sv is fitted to the connecting portion of the two reinforcing bars, The wedge Wg is press-fitted into the center hole of the steel sleeve to connect the two rebars, the headed stud Sd is fixed to the beam 2 in the space Sp1, and concrete is placed in the space Sp1, A method of adhering full PC floorboards is disclosed in which floorboards are secured to beams and full PC floorboards are secured together.

  Further, Patent Document 3 states that “the joined state of the PCa floor plate 4 and the steel structure portion of the composite structural beam 1 is as shown in FIGS. 5 and 6. Here, the plan view of FIG. For example, in this embodiment, the PCa floor plate 4 is mounted on the steel frame portion of the composite structural beam 1 so that the reinforcing bars 11 embedded in the PCa floor plate 4 overlap each other between the stats 8. The concrete is placed to the position indicated by the imaginary line with the wire mesh 12 covered, but also in this portion, as described above, the cross-shaped member 7 and the vertical U-shaped anchor bar 9 May be performed "(paragraph numbers 24 to 25).

  Further, Patent Document 4 states that “at least a cotter portion 11 that is composed of a convex portion 11 a and a concave portion 11 b at the end portion of the precast floor plate and is arranged side by side on the steel beam 15 so as to mesh with those at the end portion of the adjacent precast floor plate. One hole 12 is formed, a stud bolt 16 is disposed in the hole 12 and welded to the steel beam, and a non-shrink mortar is placed in the gap 17 and the hole 12 with the adjacent precast floor board 10. Inside the precast floor board, at least a spiral bar 13 arranged around the hole and a slab bar 14 having a U-shaped reinforcing bar part 14a arranged around the hole 12 are arranged, and this U-type reinforcing bar part 14a. The reinforcing bar 13 is arranged.

  Patent Document 5 states that “ends of two precast concrete floor boards 3A and 3B are placed on the steel beam 1 so that the end faces 4A and 4B face each other, and the space 7 between the end faces 4A and 4B is placed in the space 7”. Reinforcing the reinforcing bars from the end surfaces 4A, 4B of the floor plates 3A, 3B, and joining the floor plates 3A, 3B by placing concrete 8 in the space 7. At this time, the stud pin 10 is attached to the upper surface of the steel beam 1. A horizontal U-shaped reinforcing bar 15 is provided as a reinforcing bar, which is curved in a U-shape in a horizontal plane and has a curved end 15a projecting into the space 7, and projecting from the floor plates 3A and 3B facing each other. It is described that the bending portion 15a of the reinforcing bar 15 is fitted to every other stud pin 10 and then the concrete 8 is placed in the space 7.

  Further, Patent Document 6 states that “the connecting end 4 of the precast concrete floor plates 2, 3 is arranged opposite to the upper surface of the beam, and is protruded horizontally from the connecting end at an appropriate interval. Is inserted between the connecting bars 5 facing each other, and a bar-like bar 6 protruding from the beam upper surface is inserted into the connecting bars 4 and 5, and reinforcing bars are provided on the upper surfaces of the connecting bars 4 and 5. 7 is perpendicularly arranged, and the cast-in-place concrete 9 is placed between the joint ends 8 ”.

Japanese Patent Application Laid-Open No. 2000-17774 JP 2002-161603 A JP-A-7-207795 JP-A-9-32171 JP-A-9-158377 JP-A-9-165860

  However, by filling concrete between the two floor slabs facing each other, two sets of reinforcing bars exposed from each floor slab and stud bolts protruding from the top end of the steel beam, Because it is a structure that expects the strength of the joint to be the support pressure of the concrete against the stud or the adhesion between the concrete and the reinforcing bars, the stud bolts and reinforcing bars The problem is that the workability is deteriorated due to complex crossing and that the work is performed via cast-in-place concrete, so that a lot of labor is required to ensure the quality related to the joint strength.

  Incidentally, unlike the invention described in other patent documents, the invention described in Patent Document 4 is arranged such that the stud bolt is positioned at the center of the hole formed in the PC floor slab in advance, Although a method of filling the hole with non-shrink mortar is adopted, there is no difference in the mortar being interposed between the PC floor slab and the steel beam, and the difficulty of quality control in terms of joint strength is improved. It has not been.

  In addition, the difficulty of quality control has a considerable influence on the performance aspect of ensuring stable joint strength.

  The present invention was made in consideration of the above-mentioned circumstances, and when the precast floor slab is joined on the top end of the steel beam by joining the edge of the precast floor slab, while improving workability during construction, An object of the present invention is to provide a joint structure between a precast floor slab and a beam capable of firmly joining the precast floor slab and the steel beam in a state where quality control is easy.

  In order to achieve the above object, the joint structure of the precast floor slab and the beam according to the present invention as described in claim 1, the exposed end portion of the reinforcing bar embedded in the precast floor slab and extending from the edge end surface thereof, A stud member erected on the top end of the steel beam on which the edge of the precast floor slab is placed, and a connecting means for connecting the exposed end portion of the reinforcing bar and the stud member. A cylindrical body having an oval cross-sectional shape that is inserted in a state in which the exposed end portion and the stud member overlap each other by a predetermined length, and a pair of opposing flat plate-like wall parts among the wall parts constituting the cylindrical body, respectively. A wedge member that is inserted into the formed wedge insertion hole and press-fitted between the exposed end portion of the reinforcing bar and the stud member.

  Further, in the joining structure of the precast floor slab and the beam according to the present invention, the stud member is formed as a substantially L-shaped stud member in which two straight portions orthogonal to each other are formed. One straight part can be erected on the steel beam, and the other straight part can be inserted into the cylindrical body together with the exposed end of the reinforcing bar.

  The precast floor slab / beam connection structure according to the present invention includes, as described in claim 3, an exposed end portion of a reinforcing bar embedded in the precast floor slab and extending from an end face of the precast floor slab, and an edge of the precast floor slab. A stud member erected on the top end of the steel beam on which the part is placed, a substantially L-shaped attachment member formed with two straight portions orthogonal to each other, and two straight portions constituting the attachment member The first connecting means for connecting one straight part and the exposed end of the reinforcing bar, and the second connecting means for connecting the other straight part and the stud member, the first connecting means, A cylindrical body having an oval cross-sectional shape that is inserted in a state where the one straight portion and the exposed end of the reinforcing bar overlap each other by a predetermined length, and a pair of opposing flat plates among the wall portions constituting the cylindrical body Inserted into the wedge insertion holes formed in the respective wall portions. A wedge member press-fitted between one straight portion and the exposed end portion of the reinforcing bar, and the second connecting means overlaps the other straight portion and the stud member by a predetermined length. A cylindrical body having an oval cross-sectional shape to be inserted in a state, and the other straight line that is inserted into a wedge insertion hole formed in each of a pair of opposed flat plate wall portions among the wall portions constituting the cylindrical body And a wedge member press-fitted between the stud member and the stud member.

  Moreover, the joint structure of the precast floor slab and the beam according to the present invention is configured by a pair of precast floor slabs placed on the top end of the steel beam so that the edge end surfaces face each other. In addition, of the pair of precast floor slabs, the stud member connected to the exposed end of the reinforcing bar embedded in one precast floor slab, and the exposed end of the reinforcing bar embedded in the other precast floor slab. The stud members are erected alternately along the material axis of the steel beam.

  In the joining structure of the precast floor slab and the beam according to the first invention, the connecting means is constituted by the cylindrical body and the wedge member, and the exposed end portion of the reinforcing bar extending from the edge end surface of the precast floor slab is connected as described above. It connects with the stud member erected at the top end of the steel beam through the means.

  Moreover, in the joining structure of the precast floor slab and the beam according to the second invention, the cylindrical body and the wedge member constitute the first connection means and the second connection means, and from the edge end surface of the precast floor slab. The exposed end portion of the extending reinforcing bar is connected to the stud member erected on the top end of the steel beam via the first connecting means, the second connecting means and the accessory member described above.

  In this way, the exposed end of the reinforcing bar embedded in the precast floor slab is firmly connected to the stud member erected on the steel beam. Thus, the precast floor slab and the steel beam are made of concrete or mortar. Compared to conventional joint structures that depend on bond strength, it is possible to ensure a more stable joint strength and eliminate the need for lap joints between reinforcing bars, so when placing reinforcements and placing concrete Workability is greatly improved.

  As long as the stud member in the first invention can be connected to the exposed end portion of the reinforcing bar extending from the precast floor slab through the connecting means described above, the shape and specification thereof are arbitrary, and in particular, the exposure of the reinforcing bar extending from the precast floor slab. What is necessary is just to comprise a stud member according to the bending shape of an edge part.

  For example, when the exposed end of the reinforcing bar extends horizontally from the precast floor slab, the stud member is formed as a substantially L-shaped stud member formed with two straight portions orthogonal to each other, and the straight portion Of these, one straight portion can be erected on the steel beam, and the other straight portion can be inserted into the cylinder together with the exposed end of the reinforcing bar. On the contrary, when the exposed end of the rebar is bent in an L shape so that the exposed end of the reinforcing bar faces downward when the precast slab is placed horizontally, the stud member is It is sufficient if it is formed in a straight bar shape.

  On the other hand, when the precast floor slab is placed horizontally and the exposed end portion of the reinforcing bar is bent so as to face obliquely downward, for example, 45 °, the stud member is moved to two of 135 °. The straight member is formed as a substantially bent stud member, and one straight portion of the straight members can be erected on the steel beam, and the other straight member is the exposed end of the reinforcing bar. What is necessary is just to comprise so that it can penetrate the said cylindrical body with a part.

  For example, when the precast slab in each invention described above is joined to a steel beam erected along the outer wall of the structure, it is joined to the steel beam as a single unit. In many cases, a pair of precast slabs are assembled on the top end of a steel beam so that their edge portions face each other.

  Even in such a case, it goes without saying that each of the above-described inventions can be applied, and as a configuration in that case, for example, one of the pair of precast slabs is connected to an exposed end of a reinforcing bar embedded in one precast slab. It is conceivable that the stud member and the stud member connected to the exposed end of the reinforcing bar embedded in the other precast slab are alternately erected along the material axis of the steel beam. Further, the planar arrangement of the stud members in such a case can be, for example, a staggered arrangement.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a joint structure between a precast floor slab and a beam according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a perspective view showing a joint structure between a precast floor slab and a beam according to the present embodiment, and FIG. 2 is a plan view and a side view of the same. As can be seen from these drawings, the joint structure 1 between the precast floor slab and the beam according to the present embodiment is such that the edge portions 2a and 2b of the precast floor slabs 3a and 3b face each other. 4a and 4b are placed on the top end 8 of the steel beam 5 and stud members 9a and 9b are erected on the top end, and the exposed end portion of the reinforcing bar 6a is embedded in the precast floor slab 3a and extends from the edge end surface 2a. 7a is connected to the stud member 9a via the connecting tool 10 which is a connecting means, and the exposed end portion 7b of the reinforcing bar 6b embedded in the precast floor slab 3b and extending from the edge end surface 2b is connected to the stud member 10 via the connecting tool 10. 9b.

  As shown in FIG. 3, the connector 10 is formed in a cylindrical body 31 having an oval cross-sectional shape and a pair of opposing flat wall portions 32 and 32 among the wall portions constituting the cylindrical body. A wedge member 34 is inserted into the wedge insertion holes 33 and 33.

  Here, the cylindrical body 31 is configured to be inserted in a state where the exposed end portion 7a of the reinforcing bar 6a and the stud member 9a overlap each other by a predetermined length, and the exposed end portion 7b and the stud member 9b of the reinforcing bar 6b It is configured to be inserted in a state where it overlaps by a predetermined length. The wedge member 34 is configured to be press-fitted between the exposed end 7a of the reinforcing bar 6a and the stud member 9a, and is press-fitted between the exposed end 7b of the reinforcing bar 6b and the stud member 9b. It is comprised so that.

  As shown in FIGS. 4A and 4B, the stud member 9a is formed as a substantially L-shaped stud member in which two straight portions 41a and 42a orthogonal to each other are formed, and the straight portion 41a. Is fixed to the top end 8 of the steel beam 5 by welding, and the straight portion 42a can be inserted into the cylindrical body 31 together with the exposed end portion 7a of the reinforcing bar 6a.

  Similarly, as shown in FIGS. 4 (c) and 4 (d), the stud member 9b is formed as a substantially L-shaped stud member in which two straight portions 41b and 42b orthogonal to each other are formed. The straight part 41b is fixed to the top end 8 of the steel beam 5 by welding, and the straight part 42b is configured to be inserted into the cylindrical body 31 together with the exposed end part 7b of the reinforcing bar 6b.

  These stud members 9a and 9b are formed of deformed reinforcing bars having the same diameter as the reinforcing bars 7a and 7b, and are staggered along the material axis direction of the steel beam 5 as can be seen in FIG. 2 (a). is there. That is, the stud members 9a and 9b are connected to the stud member 9a connected to the exposed end portion 7a of the reinforcing bar 6a embedded in the precast floor slab 3a and to the exposed end portion 7b of the reinforcing bar 6b embedded in the precast floor slab 3b. The stud members 9b are erected alternately along the material axis of the steel beam 5.

  The stud members 9a and 9b may be fixed to the steel beam 5 by on-site welding, or may be welded in advance in a factory and carried to the site while being fixed to the steel beam 5. It doesn't matter.

  In order to construct the joint structure 1 between the precast floor slab and the beam according to the present embodiment, the precast floor slab 3a is placed on the top end 8 of the steel beam 5, and the stud member 9a fixed to the top end by welding. The straight portion 42a is inserted into the cylindrical body 31 together with the exposed end portion 7a of the reinforcing bar 6a extending from the precast floor slab 3a.

  The procedure for attaching the connector 10 may be appropriately selected and determined according to the situation at the site. For example, if the stud member 9a is preceded by the steel beam 5, it will be difficult to attach the connector 10 in a later step. If so, it is better to use field welding rather than factory welding. In this case, the straight portion 42a of the stud member 9a and the exposed end portion 7a of the reinforcing bar 6a are inserted into the cylindrical body 31 in advance, and after placing and positioning the precast floor slab 3a, the stud member 9a The straight portion 41 a may be welded to the top end 8 of the steel beam 5.

  The same applies to the precast floor slab 3b, and this is placed on the top end 8 of the steel beam 5, and the straight portion 42b of the stud member 9b welded and fixed to the top end is rebar 6b extending from the precast floor slab 3b. The exposed end portion 7b is inserted into the cylindrical body 31. When the stud member 9b is preceded by the steel beam 5, if it is expected that the attaching operation of the connector 10 in the subsequent process is difficult, the welding may be performed in the same manner as described above.

  When the installation of the precast floor slabs 3a and 3b and the insertion operation into the cylindrical body 31 are completed, the wedge member 34 is driven into the wedge insertion holes 33 and 33 and extends from the straight portion 42a of the stud member 9a and the precast floor slab 3a. While connecting the exposed end part 7a of the reinforcing bar 6a, the straight part 42b of the stud member 9b and the exposed end part 7b of the reinforcing bar 6b extending from the precast floor slab 3b are connected. In press-fitting the wedge member 34 through the wedge insertion holes 33, 33, a conventionally known wedge driving machine may be appropriately selected and used.

  Next, after reinforcing bars are placed in the space between the edge end faces 2a and 2b of the precast floor slabs 3a and 3b as needed, the concrete is filled and the joining operation is completed.

  As explained above, according to the joint structure 1 of the precast floor slab and the beam according to the present embodiment, the joining tool 10 is constituted by the cylindrical body 31 and the wedge member 34, and the edge end faces of the precast floor slabs 3 a and 3 b Since the exposed end portions 7a and 7b of the reinforcing bars 6a and 6b extending from 2a and 2b are connected to the stud members 9a and 9b erected on the top end of the steel beam 5 via the connector 10, the precast floor slab The exposed end portions 7a and 7b of the reinforcing bars 6a and 6b embedded in 3a and 3b can be firmly connected to the stud members 9a and 9b erected on the steel beam 5.

  Therefore, the precast floor slab 3a, the precast floor slab 3b, and the steel beam 5 are integrated through the joint 10 and the stud members 9a and 9b, and thus depend on the adhesion strength of concrete or mortar. Compared to the joint structure, more stable joint strength can be secured, and a lap joint between the reinforcing bars is not required, so that workability when placing bars and placing concrete is remarkably improved.

  In the present embodiment, the case where the pair of precast floor slabs 3a and 3b is placed on the steel beam 5 so that the edge surfaces of the precast floor slabs face each other has been described. It goes without saying that the present invention can also be applied to the case of placing a floor slab.

  In this modified example, in the above-described embodiment, only the precast floor slab 3b, the stud member 9b, and the members related thereto are omitted, and the other configurations are the same. Therefore, the description thereof is omitted here.

  Further, in the present embodiment, the stud member is configured as the substantially L-shaped stud members 9a and 9b in which the two straight portions 41a and 42a orthogonal to each other are formed. It is not limited to such a form.

  FIG. 5 shows a stud member according to a modification, and the stud member 43 according to FIG. 5 (a) is such that the exposed end portion 7a of the reinforcing bar 6a extending from the precast floor slab 3a faces obliquely downward. It is a modification in the case of bending. The stud member 43 in this case is formed as a bent stud member in which two straight portions having an obtuse angle larger than 90 ° are formed, and one straight portion of the straight portions is formed on the steel beam 5. The other straight portion may be inserted into the cylindrical body 31 of the connector 10 together with the exposed end portion 7a of the reinforcing bar 6a. Moreover, the stud member 44 according to FIG. 6B is a modification in the case where the exposed end portion 7a of the reinforcing bar 6a extending from the precast floor slab 3a is bent at a substantially right angle so as to face downward. In such a case, the stud member 44 may be formed in a straight bar shape, welded and fixed to the top end of the steel beam 5, and inserted into the cylindrical body 31 of the connector 10 together with the exposed end portion 7a of the reinforcing bar 6a.

  Moreover, in this embodiment, although the stud member 9a, 9b which comprised the stud member of this invention with the deformed reinforcing bar was used, it may replace with this and the stud member of this invention may be comprised with the bar steel which consists of a circular cross section.

  Further, in the present embodiment or the above-described modification, the stud members 9a and 9b and the stud members 43 and 44 are fixed to the top end 8 of the steel beam 5 by welding, but may be firmly fixed to the steel beam 5. For example, a known fixing method other than welding can be appropriately employed.

(Second Embodiment)

  Next, a second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 6 is a perspective view showing a joint structure between a precast floor slab and a beam according to this embodiment, and FIG. 7 is a plan view and a side view. As can be seen from these drawings, the joint structure 51 between the precast floor slab and the beam according to the present embodiment is such that the edge portions 2a and 2b of the precast floor slabs 3a and 3b face each other. 4a and 4b are placed on the top end 8 of the steel beam 5, and the stud member 58 erected on the top end is embedded in the precast floor slabs 3a and 3b and extends from the edge end faces 2a and 2b. The exposed end portions 7a and 7b of 6a and 6b are connected to each other via an attachment member 59 and two joints 10, respectively.

  That is, as shown in FIG. 8, the attachment member 59 is configured as a substantially L-shaped member in which two straight portions 61 and 62 orthogonal to each other are formed, and one straight portion 61 is connected to the second connection portion. It is connected to a stud member 58 welded and fixed to the top end 8 of the steel beam 5 via a connector 10 as a means, and the other straight portion 62 is connected via a connector 10 as a first connecting means. It is embedded in the precast floor slab 3a and connected to the exposed end 7a of the reinforcing bar 6a extending from the edge end surface 2a.

  The precast floor slab 3b is the same as that of the precast floor slab 3a except that the arrangement direction of the attachment member 59 is reversed. The attachment member 59 has its straight portion 61 connected to the stud member 58 via the connector 10. The straight portion 62 is connected to the exposed end portion 7b of the reinforcing bar 6b which is embedded in the precast floor slab 3b via the connector 10 and extends from the edge end surface 2b.

  The attachment member 59 is configured such that the straight portion 61 can be inserted into the cylindrical body 31 together with the stud member 58, and the straight portion 62 can be inserted into the cylindrical body 31 together with the exposed end portion 7a of the reinforcing bar 6a. It is.

  The attachment member 59 and the stud member 58 are made of deformed reinforcing bars having the same diameter as the reinforcing bars 7a and 7b, and the stud member 58 is arranged along the material axis direction of the steel beam 5 as can be seen in FIG. Staggered arrangement. Note that the stud member 58 may be fixed to the steel beam 5 by on-site welding, or may be previously welded at the factory and carried to the site while being fixed to the steel beam 5. .

  In order to construct the joint structure 51 between the precast floor slab and the beam according to the present embodiment, the precast floor slab 3a is placed on the top end 8 of the steel beam 5, and the straight portion 61 of the attachment member 59 is connected to the stud member 58. At the same time, the straight part 62 is inserted into the cylindrical body 31 of the connector 10 together with the exposed end 7a of the reinforcing bar 6a.

  Note that the procedure for performing the insertion work may be appropriately selected and determined in accordance with the situation at the site. For example, if the stud member 58 is preceded by the steel beam 5, it is expected that the work of attaching the connector 10 in a later process will be difficult. If so, it is better to use field welding rather than factory welding. In this case, the straight portion 61 of the attachment member 59 is inserted through the cylindrical body 31 together with the stud member 58 in advance, and the straight portion 62 is inserted through the cylindrical body 31 together with the exposed end portion 7a of the reinforcing bar 6a, After placing and positioning the precast floor slab 3a, the stud member 58 may be welded to the top end 8 of the steel beam 5.

  After the same operation is performed on the precast floor slab 3b, the wedge member 34 is driven into the wedge insertion holes 33 and 33 to connect the straight portion 61 of the attachment member 59 and the stud member 58, and the straight portion 62 and the reinforcing bar. The exposed end 7a of 6a is connected.

  Next, after reinforcing bars are placed in the space between the edge end faces 2a and 2b of the precast floor slabs 3a and 3b as needed, the concrete is filled and the joining operation is completed.

  As described above, according to the joint structure 51 between the precast floor slab and the beam according to the present embodiment, the tubular body 31 and the wedge member 34 constitute the joint 10 and are erected on the top end 8 of the steel beam 5. The stud member 58 is embedded in the precast floor slabs 3a and 3b and is attached to the exposed end portions 7a and 7b of the reinforcing bars 6a and 6b extending from the edge end surfaces 2a and 2b via the attachment members 59 and the two joints 10. Since they are connected to each other, the exposed ends 7a and 7b of the reinforcing bars 6a and 6b embedded in the precast floor slabs 3a and 3b can be firmly connected to the stud member 58 erected on the steel beam 5. It becomes.

  Therefore, the precast floor slab 3a, the precast floor slab 3b, and the steel beam 5 are integrated through the two joints 10 and the attachment member 59, and thus depend on the adhesion strength of concrete or mortar. Compared to conventional joint structures, it is possible to ensure a more stable joint strength and eliminate the need for lap joints between rebars, which greatly improves workability when placing bars and placing concrete. .

  In this embodiment, although the accessory member which concerns on this invention was comprised with the deformed reinforcing bar, it may replace with this and may comprise with the steel bar which consists of a circular cross section.

  Moreover, although this embodiment demonstrated the case where a pair of precast floor slabs 3a and 3b were mounted on the steel beam 5 so that those edge part end surfaces might oppose, the steel beam along the outer wall of a structure Needless to say, the present invention can also be applied to a case where a precast slab is placed on the slab.

  In this modified example, in the above-described embodiment, only the precast floor slab 3b, the stud member 9b, and the members related thereto are omitted, and the other configurations are the same. Therefore, the description thereof is omitted here.

The perspective view which showed the joining structure 1 of the precast floor slab and beam which concern on 1st Embodiment. It is the figure which similarly showed the joining structure 1 of a precast floor slab and a beam, (a) is a top view, (b) is an arrow view of the AA line direction. It is the figure which showed the joining tool 10, (a) is a figure which showed a mode that the exposed end part 7a of the reinforcing bar 6a and the stud member 9a were joined, (b) was a figure which showed a mode that the wedge member 34 was driven. It is the detailed view which showed the attachment condition of the stud members 9a and 9b to the steel beam 5 and the connection condition with the reinforcing bar, (a) and (c) are side views, (b) and (d) are B- The arrow view of the B line direction and CC line direction. The figure of the stud member concerning a modification. The perspective view which showed the junction structure 51 of the precast floor slab and beam which concern on 2nd Embodiment. It is the figure which similarly showed the junction structure 51 of a precast floor slab and a beam, (a) is a top view, (b) is the arrow line view of DD direction. The disassembled perspective view which showed the connection state of the attachment member 59, the stud member 58, and a reinforcing bar.

Explanation of symbols

1,51 Precast floor slab-to-beam joint structure 2a, 2b Edge end surface 3a, 3b Precast floor slab 4a, 4b Precast floor slab edge 5 Steel beam 6a, 6b Reinforcing bar 7a, 7b Exposed end 8 Top end 9a 9b Stud member 10 Joiner 31 Cylindrical body 33, 33 Wedge insertion hole 34 Wedge member 41a, 41b Straight portion 42a, 42b Straight portion 43, 44 Stud member 58 Stud member 59 Attached member 61, 62 Straight portion

Claims (4)

An exposed end of a reinforcing bar embedded in a precast floor slab and extending from an edge end surface thereof, a stud member erected on the top end of a steel beam on which the edge of the precast floor slab is placed, an exposed end of the reinforcing bar, and A connecting means for connecting the stud member, and the connecting means is inserted in a state where the exposed end portion of the reinforcing bar and the stud member overlap each other by a predetermined length, and a cylindrical body having an oval cross section. A wedge member inserted into a wedge insertion hole formed in each of a pair of opposed flat plate-like wall portions among the wall portions constituting the cylindrical body and press-fitted between the exposed end portion of the reinforcing bar and the stud member. A joint structure of precast floor slabs and beams, characterized by comprising. The stud member is formed as a substantially L-shaped stud member formed with two straight portions orthogonal to each other, and one straight portion of the straight portions can be erected on the steel beam, and The joint structure of a precast slab and a beam according to claim 1, wherein the other straight part is configured to be inserted into the cylindrical body together with the exposed end of the reinforcing bar. An exposed end portion of a reinforcing bar embedded in a precast floor slab and extending from an edge end surface thereof, a stud member standing on the top end of a steel beam on which the edge of the precast floor slab is placed, and two straight portions orthogonal to each other A first connecting means for connecting one straight portion and the exposed end portion of the reinforcing bar, and the other straight member. And a second connecting means for connecting the stud member, and the first connecting means is inserted in a state where the one straight part and the exposed end of the reinforcing bar overlap each other by a predetermined length. Is inserted into a wedge insertion hole formed in each of a pair of opposing flat plate-like wall portions of the oval cylindrical body and the wall portions constituting the cylindrical body, and the one straight portion and the exposed end of the reinforcing bar And a wedge member that is press-fitted between In addition, the second connecting means is inserted into the other straight part and the stud member in a state where they overlap each other by a predetermined length. Among them, a precast floor comprising a wedge member inserted into a wedge insertion hole formed in each of a pair of opposed flat plate wall portions and press-fitted between the other straight portion and the stud member Joint structure between plate and beam. The precast floor slab is composed of a pair of precast floor slabs placed on the top end of the steel beam so that the edge end surfaces face each other, and one of the pair of precast floor slabs A stud member connected to the exposed end of the embedded reinforcing bar and a stud member connected to the exposed end of the reinforcing bar embedded in the other precast slab are alternately arranged along the material axis of the steel beam. The joint structure of the precast slab and the beam according to any one of claims 1 to 3, wherein the structure is a standing structure.

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