JP2006336283A - Joint structure of girder member and floor slab, and its construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of girder members and a floor slab, and its construction method for positively securing requested joint force while reducing the weight of a girder structure. <P>SOLUTION: The joint structure of the girder members and the floor slab joins a plurality of girder members 1, 1 arranged in parallel at a space, and the floor slab disposed between the upper end faces of the girder members. A joint member 3 embedded in both sides of the girder member 1 and floor slab 2 has girder side plate-like parts 31 extended in the longitudinal direction of the girder member 1 and having holes 31a opened, and floor slab side plate-like parts 32 almost orthogonal to the girder side plate-like parts 31 in a plan view and having holes 32a opened. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joining structure of a girder member and a floor slab that constitute a girder structure spanned on a bridge pier such as a bridge or artificial ground, and a construction method thereof.

  When the girder member and floor slab that make up the girder structure are separately constructed, stud gibber having shear transmission performance is embedded in the girder member so as to protrude from the upper or lower surface of the girder member to the floor slab side. In addition, a structure is known in which both are joined by the stud gibber (see Patent Document 1).

  The primary purpose of the stud gibber is to provide a shear shear force generated between the girder members and the floor slab that form the girder structure when the bending moment is applied to the girder structure such as a bridge. The transmission is performed without shifting and deforming between the member and the floor slab.

Another object of the present invention is to prevent lateral displacement and rotation from occurring with respect to the horizontal force acting on the floor slab or the rotational moment acting on the head of the girder member.
Japanese Patent Laying-Open No. 2005-23726 (paragraphs 0002 to 0005, FIG. 11)

  However, since the shear strength and deformation rigidity of a single stud dowel are small, a large number of large-diameter stud gibels must be arranged at predetermined intervals to resist a large shear shear force. Must be large.

  In addition, in order to resist the force in the direction in which the floor slab is peeled off from the girder member, it is necessary to increase the embedding length of the stud gibel, so the thickness of the floor slab and the thickness of the head of the girder member are increased. Must.

  If the cross section of the floor slab or girder member becomes large in this way, not only will the material and construction costs for constructing the girder structure increase, but the weight of the girder structure will increase, and the scale of substructures such as bridge piers will also increase. This increases the overall construction cost.

  Accordingly, an object of the present invention is to provide a joining structure between a girder member and a floor slab, which can reduce the weight of the girder structure and ensure a desired joining force, and a construction method thereof.

  In order to achieve the above object, the present invention provides a girder member and a floor slab that join a plurality of girder members arranged in parallel at intervals and a floor slab arranged between at least one of the upper end surface and the lower end surface thereof. A joining structure, which is embedded in both sides of the girder member and the floor slab, extends in the longitudinal direction of the girder member and has a hole in the girder side plate-like portion, and the girder side plate-like shape It is characterized in that it is a joining structure of a girder member and a floor slab having a floor slab side plate-like part that is substantially orthogonal to the portion in plan view and that has a hole opened.

  Here, a plurality of the girder side plate-like portions are arranged in parallel at intervals in the longitudinal direction of the girder member, and a plurality of holes are opened at intervals in the longitudinal direction of the girder member, A plurality of holes can be opened and disposed across the plurality of girder side plate-like portions, and a plurality of holes can be disposed at intervals in the longitudinal direction of the girder member.

  Further, a U-shaped reinforcing bar formed in a substantially U shape is attached to at least one portion of the girder side plate-like part or the floor slab side plate-like part, and a closed cross section is formed by the joining member and the U-shaped reinforcing bar. May be.

  Furthermore, the present invention is a construction method for a joining structure of a girder member and a floor slab as described above, wherein a girder member in which a girder-side plate-like portion of the joining member is embedded is manufactured in advance, and the girder member is placed at a predetermined position. Install multiple girder members in parallel, place the main reinforcing bars for floor slabs so that they are parallel to the floor plate side plate part of the joint member, and construct the floor slab by placing cement-based mixed material It is the construction method of the joining structure of the girder member and floor slab to perform.

  Moreover, it is a construction method of the joining structure of the girder member and the floor slab described in any of the above, and the girder member in which the girder side plate-like portion of the joining member is embedded and the floor slab side plate-like portion of the joining member are disposed. A floor slab provided with a floor opening at a position to be manufactured in advance, a plurality of girder members are installed in parallel at a predetermined position, and the floor slab side plate-like part is accommodated in the floor opening. The floor slab is placed on the beam member, and the floor opening is filled with a cement-based mixed material.

Here, the girder member is a cementitious matrix obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reaction particles, and a dispersant with water. to a diameter of 0.1 to 0.3 mm, the compression strength obtained by mixing 1-4% of the total volume of the fibers in the form of 10~30mm is 150 N / mm ² or more, flexural tensile strength 25 N / mm ² or more in length The fiber can be made of a fiber-reinforced cementitious mixed material having a mechanical property of split tensile strength of 10 N / mm ² or more.

  The present invention configured as described above embeds a joining member in which a girder-side plate-like portion and a floor slab-side plate-like portion are integrated, and embeds a girder-side plate-like portion having a hole in the longitudinal direction of the girder member. Then, a floor slab side plate-like member having a hole directed in a direction substantially orthogonal thereto is embedded in the floor slab.

  For this reason, since the ratio of the said girder side plate-shaped member which occupies in the width direction of a girder member is small, the width | variety of a girder member can be made small.

  Further, since the main reinforcing bars of the floor slab are arranged in the longitudinal orthogonal direction of the girder member, the interference between the floor slab side plate-like member and the main reinforcing bars can be easily avoided.

  In addition, a plurality of girder-side plate-like portions are arranged in parallel to one joint member, and a plurality of holes are opened in the floor slab-side plate-like portion, so that the rotation can be reliably performed with respect to the rotational moment acting on the head of the girder member. Can be restrained.

  In addition, by attaching a U-shaped reinforcing bar to the joining member to form a closed cross section, it is possible to increase resistance to rotational moment, pulling force, shearing shear force, and the like.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 2 is a schematic perspective view of a girder structure 100 laid over a bridge pier such as a bridge or artificial ground, and a plurality of girder members 1 and 1 arranged in parallel and a floor slab 2 placed thereon. And the arrangement positions of the joining members 3,... Constituting the joining structure of the girder members 1, 1 and the floor slab 2 according to the present embodiment.

  FIG. 1 is an enlarged perspective view showing details of the joining member 3.

  The joining member 3 includes plate-like girder-side plate-like portions 31, 31 embedded in the girder member 1, plate-like floor-slab-side plate-like portions 32,. It is mainly comprised by the connection part 33 ... which connects the part 31, 31 and the floor slab side plate-shaped part 32, ....

  The girder-side plate-like portion 31 is formed by opening a plurality of holes 31a,... In a steel plate, for example, and extends one girder-side plate-like portion 31 in the longitudinal direction of the girder member 1 and The other girder-side plate-like portions 31 are juxtaposed at intervals in the longitudinal direction of 1.

  In the present embodiment, the floor slab side plate-like portion 32 and the connecting portion 33 are formed integrally with an L-shaped steel material 34 having a substantially L-shaped cross-sectional view, and the floor slab side plate-like portion 32 is spaced apart. A plurality of holes 32a and 32a are opened.

  The L-shaped steel material 34 is fixed by welding or the like across the spar-side plate-like portions 31, 31, and a plurality of L-shaped steel members 34 are arranged at intervals in the extending direction of the spar-side plate-like portions 31, 31, that is, the longitudinal direction of the spar member 1. Is done.

  In the present embodiment, the joining member 3 configured in this manner includes two girder-side plate-like portions 31, 31 and four floor slab-side plate-like portions 32,. Since they are orthogonal, if the girder-side plate-like portions 31, 31 are arranged along the longitudinal direction of the girder member 1, the floor slab-side plate-like portions 32,. .

  2 and 4, a plurality of the joining members 3,... Are arranged at intervals in the longitudinal direction of the beam member 1.

  3 shows a cross-sectional view of the girder structure 100 in the transverse direction (the longitudinal orthogonal direction of the girder member 1), and FIG. 4 is a cross-sectional view of the girder structure 100 in the longitudinal direction (longitudinal direction of the girder member 1). Is shown.

  As shown in these drawings, a plurality of main reinforcing bars 4,... Of the floor slab 2 are arranged at intervals in the longitudinal direction of the girder member 1 in the longitudinal orthogonal direction of the girder member 1. . Further, oblique reinforcing bars 41 are arranged around the joint between the beam member 1 and the floor slab 2.

  The main reinforcing bars 4,... And the diagonal reinforcing bars 41 of the floor slab 2 are arranged in the same direction as the floor slab side plate-like portions 32,. By disposing the main reinforcing bars 4,... And the diagonal reinforcing bars 41 between 32, interference with these can be easily avoided.

  The joint member 3 is filled with a cement-based mixed material such as concrete. When manufacturing the girder member 1, an ultra-high-strength fiber-reinforced cement-based mixed material is used. Is preferred.

  This fiber reinforced cementitious mixed material mixes metal fibers into a cementitious matrix obtained by mixing a composition containing cement, aggregate particles, pozzolanic reactive particles, and a dispersant with water. Manufactured.

  Here, an aggregate material such as cinnabar having a maximum particle size of 3.0 mm or less, preferably 2.5 mm or less is used for the aggregate particles. Further, as the pozzolanic reaction particles, those having a particle size of 15 μm or less are used. For example, silica fume or the like is used as a highly active pozzolanic reaction particle having a particle size of 0.01 to 0.5 μm, and fly ash or blast furnace slag is used as a low activity pozzolanic reaction particle having a particle size of 0.1 to 15 μm. To do. These pozzolanic reactive particles having different activities can be mixed or used alone. Further, at least one type of the dispersant is used in order to improve fluidity.

For the metal fiber, for example, a steel fiber having a diameter of about 0.1 to 0.3 mm and a length of about 10 to 30 mm and a tensile yield stress of 2600 to 2800 N / mm ² is used. Further, this steel fiber is mixed in an amount of about 1 to 4% of the total volume of the fiber-reinforced cementitious mixed material to be produced.

The fiber-reinforced cement-based mixed material produced with such a composition has a compressive strength of 150 to 200 N / mm ² , a bending tensile strength of 25 to 45 N / mm ² , a split tensile strength of 10 to 25 N / mm ² , and a water permeability. The coefficient is 4.0 × 10 ⁻¹⁷ cm / sec, the salt diffusion coefficient is 0.0019 cm ² / year, and the elastic modulus is 50 to 55 GPa.

  Moreover, it is economical and preferable to construct the slab concrete or the prestressed concrete using the concrete as a cement-type mixed material for the floor slab 2 which arrange | positions and constructs the main reinforcing bars 4, ....

  Next, the construction method of the joining structure of the girder members 1 and 1 and the floor slab 2 of the present embodiment will be described.

  First, the girder member 1 is manufactured from a fiber-reinforced cement-based mixed material at a production yard near the factory or the site. When the girder member 1 is manufactured, a plurality of joining members 3,... Are arranged on the upper end surface at a predetermined interval in the longitudinal direction (see FIGS. 2 and 4).

  The joining member 3 is fixed in accordance with the height at which the spar-side plate-like portion 31 and the connecting portion 33 are buried below the upper end surface of the spar member 1, and the fiber-reinforced cement-based mixed material for the spar member 1 is surrounded by It is made to integrate with the girder member 1 by filling.

  Further, in order to further increase the joining rigidity between the girder member 1 and the floor slab 2, after the curing of the girder member 1 is finished, an adhesive such as epoxy resin or acrylic resin is applied to the upper end surface of the girder member 1. It is preferable to apply unevenness to the surface of the upper end surface by spraying fine sand or dredged sand.

  And the girder member 1 manufactured in this way is conveyed to the field, and it installs so that the two girder members 1 and 1 may be juxtaposed in a predetermined position. Here, since the girder member 1 is formed in a length of a transportable block (not shown), for example, a PC steel wire (not shown) is penetrated in the longitudinal direction of the girder member 1 and is tensioned. Each block is connected and integrated.

  In the field, as shown in FIG. 3, a mold 5, which forms the lower surface of the floor slab 2 is provided between the upper end surfaces of the girder members 1, 1 (the support work for supporting the mold 5,. 4), as shown in FIG. 4, between the joining members 3 and 3, and between the slab side plate-like portions 32 and 32, the main reinforcing bars 4,... And the oblique reinforcing bars 41,. (Not shown).

  Moreover, the reinforcing bar (not shown) arrange | positioned toward the longitudinal direction of the girder member 1 can be penetrated and arrange | positioned through the holes 32a.

  In this state, the floor slab 2 is completed by filling the concrete for the floor slab 2.

  Next, the effect | action of the joining structure of the girder members 1 and 1 and the floor slab 2 of this Embodiment is demonstrated, referring FIG.

  In the joining member 3 described above, holes 31a and 32a are opened in the girder side plate-like portion 31 and the floor slab side plate-like portion 32, and the fiber-reinforced cement-based mixed material or concrete filled in the holes 31a and 32a is shown in FIG. As shown in Fig. 4, it becomes resistance to the shearing force in the vertical direction.

  Further, the fiber-reinforced cement-based mixed material filled in the holes 31a,... Of the spar-side plate-like portion 31 has resistance to the shearing force in the longitudinal direction of the spar member 1 as shown in FIG.

  Similarly, the concrete filled in the holes 32 a and 32 a of the floor slab side plate-like portion 32 provides resistance to the shear shear force in the longitudinal direction of the girder member 1.

  Moreover, since the girder side plate-like portion 31 and the floor slab side plate-like portion 32 serve as bearing resistances of the fiber-reinforced cement-based mixed material or concrete that abuts the plate surface, they are resistant to the shear shear force in the direction perpendicular to the plane.

  Furthermore, by arranging the girder-side plate-like portions 31 and 31 in parallel, the rotation can be reliably restrained against the rotational moment acting on the head of the girder member 1. Further, in the floor slab 2, as shown in FIG. 7, the two holes 32a and 32a opened in the floor slab side plate-like portion 32 can resist the pulling force and pushing force in the vertical direction and restrain the rotation. .

  Thus, the two-sided shear resistance of the fiber-reinforced cement-based mixed material or concrete filled in the holes 31a and 32a and the bearing resistance of the plate-like portions of the girder-side plate-like portion 31 and the floor slab-side plate-like portion 32 are displaced. Since it is possible to resist the shearing force, the pulling force, and the pushing force, a desired joining force can be reliably ensured.

  In addition, in the width direction of the spar member 1, the spar-side plate-like members 31, 31 only occupy the thickness, so that the occupying ratio of the spar-side plate-like members 31, 31 becomes small and the cross-section of the spar member 1 becomes small. it can.

  Further, if the shear shear rigidity is increased, the deflection generated by the behavior of the girder member 1 and the floor slab 2 as a unit when bending acts on the girder member 1 can be reduced.

  Hereinafter, Example 1 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  FIGS. 5 and 6 are a cross-sectional view and a vertical cross-sectional view of the girder structure 100 shown for explaining the construction method of the joining structure of the girder members 1 and 1 and the floor slab 2 of the first embodiment.

  In the above embodiment, only the girder member 1 is manufactured at a factory or the like, but in Example 1, a precast floor slab 6 as a floor slab is also manufactured in advance at a factory or the like.

  The precast floor slab 6 is provided with a floor opening 6 a at a position where the floor slab side plate-like portions 32,... Of the joining member 3 are disposed when placed on the beam members 1, 1. .

  Further, in this precast floor slab 6, the main reinforcing bars 4 and the oblique reinforcing bars 41 are arranged without being cut at the floor opening 6 a, so that the main reinforcing bars 4 and the oblique reinforcing bars 41 are exposed at the floor opening 6 a. .

  The precast floor slab 6 is placed on the girder so that the main reinforcing bar 4 and the oblique reinforcing bar 41 exposed in the floor opening 6a are arranged between the floor slab side plate-like parts 32,. Place on the members 1, 1.

  Then, the space between the lower edge of the floor opening 6a and the upper surface of the girder member 1 is sealed with a sealant 7, 7 such as rubber as shown in FIG. 5, and then concrete, non-shrink mortar or fiber reinforced cement is applied to the floor opening 6a. The precast floor slab 6 and the girder members 1 and 1 are joined by filling a filler such as a system mixed material.

  Also in this case, in order to further increase the joining rigidity between the girder members 1 and 1 and the floor slab 2, after curing of the girder members 1 and 1, an adhesive such as epoxy or acrylic resin is applied to the upper end surface thereof. It is preferable to apply and scatter fine sand or cinnabar sand on the surface to make the surface of the upper end surface uneven.

  In addition, an adhesive such as epoxy or acrylic resin is applied to the portion of the lower surface of the floor slab 2 where the girder members 1 and 1 are joined, and fine sand or dredged sand is applied to the surface to make the surface uneven. preferable.

  According to such a construction method of the joining structure of the girder members 1, 1 and the floor slab 2, the separately produced girder members 1, 1 and the precast floor slab 6 can be reliably joined.

  Further, since the main reinforcing bar 4 and the oblique reinforcing bar 41 of the precast floor slab 6 do not interfere with the joining member 3 in the floor opening 6a, it can be arranged without cutting, and the strength of the precast floor slab 6 can be increased. There is no reduction around the opening 6a.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, Example 2 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment or Example 1 will be given the same reference numerals.

  In Example 2, an embodiment in which a U-shaped reinforcing bar 8 formed in a substantially U shape is attached to the joining member 3 used in the embodiment or Example 1 will be described with reference to FIGS. 7 and 8. .

  As shown in FIG. 7, this U-shaped reinforcing bar 8 is formed by bending a steel material such as a deformed reinforcing bar twice and forming substantially parallel legs 8b, 8b and an intermediate part 8c therebetween.

  When the leg portions 8b, 8b of the U-shaped reinforcing bar 8 are fixed by welding such that the intermediate portion 8c protrudes from the floor plate side plate portion 32 of the joining member 3, for example, the floor plate side plate portion 3 and the U shape A closed section 8 a is formed between the reinforcing bars 8, in other words, between the joining member 3 and the U-shaped reinforcing bar 8.

  When the U-shaped reinforcing bar 8 is attached to the joining member 3 in this way, the adhesion resistance between the U-shaped reinforcing bar 8 and a filler such as concrete filled around the U-shaped reinforcing bar 8 is reduced between the floor slab 2 and the girder member 1. Therefore, the resistance of the joining structure is increased.

  Further, as shown in FIG. 8, the U-shaped reinforcing bar 8 can be expected to have a concrete bearing resistance and a dowel effect of the reinforcing bar, so that the joining structure of the girder member 1 and the floor slab 2 is made stronger. Can do.

  Furthermore, by increasing the bonding force with such a U-shaped rebar 8, the bonding force of the bonding structure can be increased without increasing the bonding member 3.

  Moreover, even if the filler with which the circumference | surroundings of the joining member 3 are filled is normal concrete by attaching this U-shaped reinforcing bar 8, a required joining force can be ensured reliably.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or Example 1, and thus description thereof is omitted.

  Hereinafter, Example 3 of the above-described embodiment will be described. Note that the description of the same or equivalent parts as those described in the embodiment or other examples will be given with the same reference numerals.

  FIG. 9 shows a perspective view of the joining member 9 described in the third embodiment.

  The joining member 9 is provided on a U-shaped steel material 94 having a substantially U-shaped cross-sectional view in which the girder-side plate-like portions 91, 91 embedded in the girder member 1 and the coupling portion 93 are integrally formed. A plurality of floor slab side plate-like portions 92,... Are fixed to the upper surface by welding or the like at intervals in the longitudinal direction.

  The girder side plate-like portion 91 and the floor slab side plate-like portion 92 are provided with holes 91a and 92a, respectively.

  Further, the U-shaped reinforcing bars 10 </ b> A to 10 </ b> D are attached to the joining member 9.

  Here, the U-shaped rebar 10A is fixed to the floor slab side plate-like portion 92 disposed at the end, and the U-shaped rebar 10B having a different shape from the U-shaped rebar 10A is the other. It is fixed to the floor slab side plate-like portion 92.

  Further, the U-shaped rebar 10C is fixed so as to straddle between the spar-side plate-like portions 91 and 91, and the U-shaped rebar 10D has both leg portions fixed to one spar-side plate-like portion 91.

  Thus, the shape, the number of attachments, or the attachment position of the U-shaped reinforcing bars 10A to 10D can be arbitrarily set.

  In particular, by attaching the U-shaped reinforcing bars 10C and 10D to the girder side plate portions 91 and 91, even if the girder member 1 is made of ordinary concrete instead of the fiber reinforced cementitious mixed material, the necessary joining force is ensured. Can do.

  When the number of U-shaped reinforcing bars 10A to 10D is increased, the adhesion resistance between the concrete or fiber-reinforced cement-based mixed material filled around the U-shaped reinforcing bars 10A to 10D increases. This increases the resistance against shearing shear force and pulling force.

  Moreover, the position and direction which increase resistance force can be adjusted by changing the attachment position and direction of U-shaped rebar 10A-10D.

  Other configurations and functions and effects are substantially the same as those of the above-described embodiment or other examples, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiments and examples, the girder structure 100 in which the floor slabs 2 and 6 are placed on the girder member 1 has been described. However, the present invention is not limited to this, and a plurality of upper floor slabs and lower floor slabs are used. The joining structure of the spar members 1, 1 and the floor slab 2 of the present invention can also be applied to a box-type spar structure that connects between the upper end surface and the lower end surface of the spar member.

  Moreover, although the said embodiment demonstrated the case where the two sheet | seat side plate-shaped parts 31 and 31 were arrange | positioned in parallel, it is not limited to this, The beam side plate-shaped part 31 is made into one sheet, or in parallel It is also possible to arrange three or more.

  Furthermore, in the said embodiment and Example, although the case where the girder member 1 was constructed | assembled with a fiber reinforced cementitious mixed material and the floor slab 2 was constructed with concrete was not limited to this, the girder member 1 was reinforced concrete. Alternatively, it can be arbitrarily selected to construct with prestressed concrete or to construct the floor slab 2 with a fiber reinforced cementitious mixed material.

  Here, when constructing the girder member 1 and the floor slab 2 with a fiber-reinforced cement-based mixed material, it is usually unnecessary to arrange reinforcing bars.

It is a perspective view explaining the structure of the joining structure of the girder member and floor slab of the best embodiment of this invention. It is a perspective view explaining the schematic structure of a girder structure. It is a cross-sectional view of the girder structure of the best embodiment of the present invention. It is a longitudinal cross-sectional view of the girder structure of the best embodiment of the present invention. 2 is a transverse cross-sectional view of a girder structure of Example 1. FIG. 1 is a longitudinal sectional view of a girder structure of Example 1. FIG. It is a cross-sectional view explaining the effect | action of the joining structure of the girder member and floor slab of Example 2. FIG. It is a longitudinal cross-sectional view explaining the effect | action of the joining structure of the girder member and floor slab of Example 2. FIG. 6 is a perspective view illustrating a configuration of a joining member of Example 3. FIG.

Explanation of symbols

1 Girder member 2 Floor slab 3 Joint member 31 Girder side plate-like portion 31a hole 32 Floor slab side plate-like portion 32a hole 6 Precast floor slab (floor slab)
6a Floor opening 8 U-shaped rebar 8a Closed cross section 9 Joining member 91 Girder side plate-like portion 91a Hole 92 Floor slab side plate-like portion 92a Hole 10A to 10D U-shaped rebar

Claims (6)

A joining structure of a girder member and a floor slab that joins a plurality of girder members arranged in parallel at intervals and a floor slab disposed between at least one of the upper end surface and the lower end surface thereof,
The joining members embedded on both sides of the girder member and the floor slab are extended in the longitudinal direction of the girder member and opened with a hole, and the girder side plate-like portion is substantially in plan view. A structure for joining a girder member and a floor slab having a floor slab side plate-like portion that is orthogonal and has a hole.   A plurality of the girder side plate-like portions are arranged in parallel at intervals in the longitudinal orthogonal direction of the girder member, and a plurality of holes are opened at intervals in the longitudinal direction of the girder member. 2. The spar member according to claim 1, wherein a hole is opened and disposed across the plurality of spar-side plate-like portions, and a plurality of spar members are disposed at intervals in the longitudinal direction of the spar member. Floor plate joint structure.   A U-shaped reinforcing bar formed in a substantially U shape is attached to at least one place of the girder side plate-like part or the floor slab side plate-like part, and a closed cross section is formed by the joining member and the U-shaped reinforcing bar. The joining structure of a girder member and a floor slab according to claim 1 or 2. A construction method for a joining structure of a girder member and a floor slab according to any one of claims 1 to 3,
A girder member in which the girder side plate-like portion of the joining member is embedded is manufactured in advance, a plurality of girder members are arranged in parallel at predetermined positions, and are arranged in parallel with the floor slab side plate-like portion of the joining member. A method for constructing a joint structure between a girder member and a floor slab, wherein main slabs for the floor slab are arranged and a cement-based mixed material is placed to construct the floor slab. A construction method for a joining structure of a girder member and a floor slab according to any one of claims 1 to 3,
A girder member in which the girder side plate-like portion of the joining member is embedded and a floor slab provided with a floor opening at a position where the floor slab side plate-like portion of the joining member is disposed are manufactured in advance, and the girder member at a predetermined position. Are placed in parallel, and the floor slab is placed on the girder member so that the floor slab side plate-like portion is accommodated in the floor opening, and a cement-based mixed material is placed in the floor opening. A construction method of a joining structure of a girder member and a floor slab characterized by filling. The girder member has a diameter in a cementitious matrix obtained by mixing a composition containing cement, aggregate particles having a maximum particle size of 2.5 mm or less, pozzolanic reaction particles, and a dispersant with water. but 0.1 to 0.3 mm, compressive strength obtained by mixing 1-4% of the total volume of the fibers in the form of 10~30mm length of 150 N / mm ² or more, flexural tensile strength 25 N / mm ² or more, Wari裂tensile 6. The method for constructing a joining structure of a girder member and a floor slab according to claim 4 or 5, wherein the construction method is made of a fiber-reinforced cement-based mixed material having a mechanical property of 10 N / mm ² or more.

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