JP2024012114A - Joint structure of steel beam and precast floor slab - Google Patents

Abstract

To provide a joint structure of a steel beam and a precast floor slab capable of absorbing steps when slabs of different thicknesses are employed in a mixed plane structure.SOLUTION: A joint structure 100 of a steel beam and a precast floor slab comprises a steel beam 12A configured in a steel structure and installed in a steel-framed section 1, a floor slab 13 installed in the steel-framed section 1, a precast floor slab 23 installed in another structural section 2 located adjacent to the steel-framed section 1 and configured in the other structure than the steel structure, an insert material embedded in the precast floor slab 23 so as to be exposed at a small opening 24 that faces the steel beam 12A, a joint material 3 arranged over the steel beam 12A and the small opening 24, a first joint 36 joining the steel beam 12A and the joint material 3, and a second joint 37 joining the joint material 3 and the insert material, and a thickness of the floor slab 13 installed in the steel-framed section 1 is different from a thickness of the precast floor slab 23.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a joint structure between a steel beam and a precast deck slab.

Conventionally, in buildings with a planar mixed structure of wood and steel or RC structures, the steel structure part (hereinafter referred to as the "steel structure part") or the RC structure part (hereinafter referred to as the "RC structure part") is generally used. It is common to construct a wooden part (hereinafter referred to as "wooden part") first, and then construct a wooden part (hereinafter referred to as "wooden part") (see Patent Document 1 below).

Considering earthquakes during construction, it is reasonable to construct a wooden section after constructing horizontal and vertical structural surfaces that ensure structural performance using a steel frame section or an RC section. A deck plate floor or RC floor may be used for the floor of a steel structure or RC structure constructed first, and a precast floor may be used for the floor of a wooden structure constructed later. In this case, it is necessary to ensure a necessary joint length between the floor of the steel structure or RC structure and the floor of the wooden structure, which are constructed in advance. By ensuring a specified dimension (for example, 40 times the diameter of the reinforcing bars) between the floor of a steel-framed part or RC part and the floor of a wooden part, concrete is poured between the floors on site. One possible method is to integrate the floor. When the distance between floors becomes longer, it leads to constraints on the plan, such as a shorter distance between columns in a steel-framed or RC-framed section, or a shorter distance between columns in a wooden section.

Buildings with a mixed plan structure may have different floor configurations on the same floor. For example, the floor thickness of a wooden part may be different from that of a steel-framed part or a reinforced concrete part. In such a case, if the floor top levels of both are made to be the same, the beam tops will be at different heights. In this case, if you try to place a precast floor slab on the top of a typical steel beam, you will need to take measures such as partially thickening or thinning the end of the precast floor, increasing the number of parts, design time, and Directly linked to manufacturing time and manufacturing costs.

A method has been proposed in which precast floor slabs are joined via gibber bars and non-contraction mortar (see Patent Document 2 below).

Patent No. 2676126 Japanese Patent Application Publication No. 9-32171

However, if there is a difference in level between the beam tops of a steel frame part and the beam tops of a wooden part, applying the joining method such as Patent Document 2 will partially thicken the end of the precast slab. It is necessary to take measures such as making the material thinner or thinner, which leads to problems such as an increase in the number of types of parts and the need for design and manufacturing time.

The present invention has been made in view of the above circumstances, and provides a joint structure between a steel beam and a precast floor slab that can absorb steps when slabs of different thicknesses are used in a planar mixed structure. It is something to do.

In order to achieve the above object, the present invention employs the following means.
That is, the joint structure of a steel beam and a precast deck according to the present invention is a steel beam installed in a steel frame structure made of a steel structure, a floor slab installed in the steel frame structure, and the steel frame structure. A precast floor slab that is placed adjacent to the section and installed in another structural section that is composed of a structure other than a steel frame structure, and an insert that is buried so as to be exposed at the edge of the precast floor slab that faces the steel beam side. a bonding material disposed across the steel beam and the edge; a first bonding portion for bonding the steel beam and the bonding material; and a second bonding portion for bonding the bonding material and the insert material. , the thickness of the deck installed in the steel structure is different from the thickness of the precast deck.

In the joint structure of steel beams and precast deck slabs configured in this way, the joining material placed across the edges of the steel beams and precast deck slabs is joined to the insert material exposed at the edges of the steel beams and precast deck slabs. ing. Therefore, since the precast floor slabs of other structures are joined to the steel beams through the bonding material, even if the floor thickness is different between the slab of the steel structure section and the precast floor slabs of other structures, the height of the bonding material will be By adjusting the thickness, the thickness of the precast slab can be absorbed and the precast slab can be joined to the steel beam.

Moreover, in the joint structure of a steel beam and a precast deck slab according to the present invention, the floor slab installed in the steel frame structure may be placed on the steel beam.

In the joint structure of the steel beam and the precast floor slab configured in this way, the floor slab installed in the steel frame structure can be directly supported by the steel beam of the steel frame structure.

Moreover, in the joint structure of a steel beam and a precast deck slab according to the present invention, the precast deck slab may be placed on the steel beam.

In the joint structure between the steel beam and the precast deck constructed in this way, the precast deck can be directly supported by the steel beam.

Moreover, in the joining structure of a steel beam and a precast floor slab according to the present invention, the insert material may be a female thread to which the second joint portion is fastened.

In the joint structure between the steel beam and the precast deck constructed in this way, the insert material is a female screw embedded in the precast deck. Therefore, since the insert material does not protrude from the precast slab, damage during transportation and construction can be suppressed. Further, when fixing the bonding material, the second bonding portion may be fastened to the insert material, so construction can be easily carried out.

Moreover, in the joining structure of a steel beam and a precast floor slab according to the present invention, the joining material is provided upright from a first plate part joined to an upper flange of the steel beam, and the first plate part, and and a second plate portion joined to the insert material.

In the joint structure between the steel beam and the precast floor slab configured in this way, the shape of the joint material is such that the second plate part is erected from the first plate part, so the joint material has a simple structure. be able to.

Moreover, in the joining structure of a steel beam and a precast floor slab according to the present invention, a long hole may be formed in the first plate portion in a direction perpendicular to a material axis direction of the steel beam.

In the joint structure between a steel beam and a precast deck constructed in this way, a long hole is formed in the first plate part that is connected to the upper flange of the steel beam in a direction perpendicular to the axial direction of the steel beam. has been done. Therefore, the attachment position of the first plate portion to the steel beam can be adjusted in a direction perpendicular to the axial direction of the steel beam.

Moreover, in the joining structure of a steel beam and a precast deck according to the present invention, the joining material joins the first plate part and the second plate part, and a plurality of joining materials are provided in the axial direction of the steel beam. It may have a rib plate portion.

In the joint structure between the steel beam and the precast deck constructed in this way, the joint material has a plurality of rib plate parts that join the first plate part and the second plate part in the axial direction of the steel beam. There is. Therefore, the rigidity of the bonding material can be increased.

Moreover, in the joining structure of a steel beam and a precast floor slab according to the present invention, the first joint portion may be a bolt that joins the steel beam and the joining material.

In the joint structure between the steel beam and the precast deck constructed in this way, the first joint that joins the steel beam and the joining material is a bolt, so the steel beam can be easily joined to the joining material. .

Moreover, in the joint structure of a steel beam and a precast deck according to the present invention, the second joint portion may be a bolt that joins the joint material and the insert material.

In the joint structure between the steel beam and the precast deck constructed in this way, the second joint that joins the joint material and the insert material is a bolt, so it can be easily joined to the joint material and the insert material. .

According to the joint structure between a steel beam and a precast floor slab according to the present invention, it is possible to absorb differences in level when slabs of different thicknesses are employed in a planar mixed structure.

FIG. 1 is a perspective view showing a joint structure between a steel beam and a precast floor slab according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view showing a joint structure between a steel beam and a precast floor slab according to a first embodiment of the present invention. It is a sectional view showing a joint structure of a steel beam and a precast floor slab according to a second embodiment of the present invention.

(First embodiment)
Hereinafter, a precast floor slab and a steel beam according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a joint structure between a steel beam and a precast floor slab according to a first embodiment of the present invention.
As shown in FIG. 1, the building structure according to the present embodiment includes a steel frame part 1 made of steel, and a wooden part (other structure part) 2 made of wood. It is a planar mixed structure). The steel frame part 1 and the wooden part 2 are horizontally adjacent to each other and are integrally provided.

The steel structure 1 includes steel columns 11, beams (steel beams) 12, and slabs (floor slabs) 13.

The steel column 11 is a square steel pipe. Beam 12 extends horizontally. The beam 12 is a steel frame material. In this embodiment, the beam 12 is an H-section steel. The beam 12 is joined to the steel column 11 via a gusset plate 12a.

In the horizontal direction, the extending direction of one first beam 12A of the beams 12 is the first direction (direction indicated by X in the figure), and the extending direction of the other second beam 12B of the beams 12 is the first direction. There are two directions (directions indicated by Y in the figure). The slab 13 is placed on the first beam 12A. The slab 13 is joined to the first beam 12A by a joining means (not shown). The structure of the slab 13 can be set as appropriate, such as a structure in which cast-in-place concrete is placed above the deck plate, a precast floor slab, or the like.

FIG. 2 is a sectional view showing a joint structure between a steel beam and a precast floor slab according to an embodiment of the present invention.
As shown in FIG. 2, the height of the first beam 12A to the upper flange 14 is H1. Let the thickness of the slab 13 be t1.

As shown in FIG. 1, the wooden part 2 includes wooden columns 21, beams 22, and precast floor slabs 23. Beam 22 extends horizontally. The beam 22 is a steel frame material. In this embodiment, the beam 22 is an H-section steel. Precast floor slab 23 is installed on beam 22. The precast floor slab 23 is placed adjacent to the steel frame structure 1.

Next, a joint structure 100 between a steel beam and a precast floor slab will be described. As shown in FIG. 2, a joint structure 100 of steel beams and precast deck slabs includes a first beam 12A of the steel frame section 1, a precast floor slab 23 of the wooden section 2, an angle material (joining material) 3, It includes an insert material 41, a bolt (first joint) 36 (see FIG. 1), and a bolt (second joint) 37.

The angle members 3 are arranged along the surface of the precast floor slab 23 facing the wooden pillar 21 side. The angle members 3 are arranged along the extending direction of the first beam 12A of the steel structure 1. The angle member 3 is arranged over substantially the entire length of the first beam 12A. The angle member 3 is arranged above the upper flange 14 of the first beam 12A.

The angle member 3 has an L-shaped cross section when viewed from the extending direction of the first beam 12A. The angle member 3 includes a first plate portion 31, a second plate portion 32, and a rib plate portion 33.

The first plate portion 31 has a plate shape. The plate surface of the first plate portion 31 faces in the up-down direction.

As shown in FIG. 1, the first plate portion 31 has a direction (direction indicated by arrow Y) perpendicular to the extending direction (material axis direction) of the first beam 12A (hereinafter referred to as the "width direction"). A long slot 31a is formed. A plurality of long holes 31a are formed at intervals in the extending direction of the first beam 12A.

The second plate portion 32 stands up from the end of the first plate portion 31 . The second plate portion 32 is formed into a plate shape. The plate surface of the second plate portion 32 faces in a direction (direction indicated by arrow Y) orthogonal to the extending direction of the first beam 12A.

As shown in FIG. 2, the second plate portion 32 is arranged along the edge 24 of the precast floor slab 23 facing the first beam 12A side.

As shown in FIG. 1, the rib plate section 33 joins the first plate section 31 and the second plate section 32. The rib plate portion 33 has a plate shape. The plate surface of the rib plate portion 33 faces the direction in which the angle member 3 extends. A plurality of rib plate portions 33 are provided at intervals in the extending direction of the angle member 3.

As shown in FIG. 2, the insert material 41 is embedded in the precast floor slab 23. A female thread is formed on the inner peripheral surface of the insert material 41. The end of the insert material 41 is exposed at the edge 24 of the precast floor slab 23. A plurality of insert members 41 are provided at intervals in the extending direction of the angle member 3.

As shown in FIG. 1, the bolt 36 is inserted from below into a bolt hole (not shown) formed in the upper flange 14 of the first beam 12A, and is inserted into the elongated hole 31a of the first plate portion 31 of the angle member 3. and is fastened to a nut 38. Thereby, the first plate portion 31 of the angle member 3 is joined to the upper flange 14 of the first beam 12A.

The long hole 31a into which the bolt 36 is inserted has a long shape in the width direction of the first beam 12A. Thereby, the attachment position of the first beam 12A of the precast floor slab 23 to the first beam 12A in the width direction (direction shown by arrow Y) can be adjusted.

The bolts 37 are inserted into bolt holes (not shown) formed in the second plate part 32 of the angle member 3 and bolt holes (not shown) formed in the first plate part 31, and are inserted into the insert material 41 (see FIG. 2). It has been concluded. Thereby, the second plate portion 32 of the angle member 3 is joined to the precast floor slab 23.

In other words, the first beam 12A and the precast floor slab 23 are joined via the angle members 3, and can transmit horizontal loads.

As shown in FIG. 2, the height of the beam 22 to the upper flange 25 is defined as H2. Let the thickness of the precast floor slab 23 be t2. The height H2 of the beam 22 to the upper flange 25 is higher than the height H1 of the first beam 12A to the upper flange 14. The thickness t2 of the precast floor slab 23 and the thickness t1 of the slab 13 are different. The thickness t2 of the precast floor slab 23 is thinner than the thickness t1 of the slab 13. The upper surface 23u of the precast floor slab 23 and the upper surface 13u of the slab 13 are at the same height.

In the joint structure 100 of a steel beam and a precast floor slab configured in this way, the angle member 3 placed across the first beam 12A and the edge 24 of the precast floor slab 23 is connected to the upper flange 14 of the first beam 12A and the precast It is joined to the insert material 41 exposed at the edge 24 of the floor slab 23. Therefore, since the precast floor slab 23 of the wooden part 2 is joined to the first beam 12A via the angle material 3, even if the precast floor slabs of the steel structure part 1 and the wooden part 2 have different floor thicknesses, the angle material By adjusting the height of 3, the precast floor slab 23 can be joined to the first beam 12A by absorbing the floor thickness of the precast floor slab.

Moreover, since the shape of the angle member 3 is such that the second plate portion 32 is erected from the first plate portion 31, the angle member 3 can have a simple configuration. Even if the floor thickness t1 of the slab 13 and the floor thickness t2 of the precast floor slab 23 are different between the steel structure part 1 and the wooden part 2, by adjusting the vertical length of the second plate part 32, the precast The precast floor slab 23 can be joined to the first beam 12A by absorbing the floor thickness of the floor slab. Furthermore, the angle members 3 can effectively transmit shear force.

Moreover, the slab 13 installed in the steel structure 1 can be directly supported by the first beam 12A of the steel structure 1.

Moreover, the insert material 41 is a female thread embedded in the edge 24 of the precast floor slab 23 so as to be exposed therein. Therefore, since the insert material 41 does not protrude from the precast floor slab 23, damage during transportation and construction can be suppressed. Further, when fixing the angle member 3, it is only necessary to fasten the bolt 37 to the insert member 41, so that construction can be easily performed.

Further, a long hole 31a that is long in the width direction of the first beam 12A is formed in the first plate portion 31 of the angle member 3 that is joined to the upper flange 14 of the first beam 12A. Therefore, the attachment position of the first plate portion 31 to the first beam 12A can be adjusted in the width direction of the first beam 12A.

In addition, if the floor of the steel structure 1 does not exist due to an atrium or the like, when tensile force and compressive force are generated in the axial direction of the first beam 12A, a force that tends to twist is generated in the first beam 12A. . For example, the H-shaped steel that constitutes the first beam 12A has a characteristic that it is very weak against twisting. In order to prevent the generation of tensile force and compressive force in the axial direction of the steel frame beam at the relevant part, the angle beam 3 and the first beam 12A are fixed with long holes 31a in the direction perpendicular to the axis of the steel frame. It has a position adjustment function in the exit direction that absorbs accuracy, and can transmit only the seismic force in the direction of the material axis of the first beam 12A.

Further, the angle member 3 is provided with a plurality of rib plate portions 33 for joining the first plate portion 31 and the second plate portion 32 in the extending direction of the first beam 12A. Therefore, the rigidity of the angle member 3 can be increased.

In addition, by providing the rib plate portion 33 on the angle member 3 in consideration of the case where compressive force and tensile force act on the second plate portion 32 of the angle member 3, damage to the angle member 3 during an unexpected earthquake can be avoided. can be suppressed.

Moreover, since the bolts 36 are used to join the upper flange 14 of the first beam 12A and the first plate portion 31 of the angle member 3, the first beam 12A can be easily joined to the angle member 3. Furthermore, since it is a dry bonding method, the bonding accuracy can be improved. Furthermore, dry joining eliminates the need for a predetermined required joint length and does not affect plan design.

Furthermore, since the bolts 37 are used to join the second plate portion 32 of the angle member 3 and the insert member 41, the angle member 3 and the insert member 41 can be easily joined. Furthermore, since it is a dry bonding method, the bonding accuracy can be improved. Furthermore, dry joining eliminates the need for a predetermined required joint length and does not affect plan design.

(Second embodiment)
Next, a precast floor slab and a steel beam according to a second embodiment of the present invention will be described using mainly FIG. 3. FIG. 3 is a sectional view showing a joint structure between a steel beam and a precast floor slab according to a second embodiment of the present invention. In the following description of the embodiment, the same reference numerals are used for members and portions that are the same as or similar to those of the above-described embodiment, and the description thereof will be omitted, and configurations that are different from the embodiment will be described.

As shown in FIG. 3, in the steel frame structure 1, an angle member 5 is fixed to the first beam 12A. The angle member 5 has an L-shaped cross section when viewed from the extending direction of the first beam 12A. The angle member 5 is arranged along the extending direction of the first beam 12A. The angle member 5 includes a first plate portion 51, a second plate portion 52, and a rib plate portion 53.

The first plate portion 51 is arranged along the web 15 of the first beam 12A. The first plate portion 51 is fixed to the web 15 with bolts 16 and nuts 17.

The second plate portion 52 is bent from the upper end of the first plate portion 51 at a substantially right angle. The surface on which the second plate portion 52 was located faces in the up-down direction. The slab 13 is mounted and installed on the second plate section 52. The slab 13 is joined to the second plate portion 52 by a joining means (not shown).

The rib plate portion 53 joins the first plate portion 51 and the second plate portion 52. The rib plate portion 53 has a plate shape. The plate surface of the rib plate portion 53 faces the direction in which the angle 5 extends. A plurality of rib plate portions 53 are provided at intervals in the extending direction of the angle member 5.

In the wooden part 2, the precast floor slab 23 is placed on the upper flange 14 of the first beam 12A. The first plate portion 31A of the angle member 3A is fixed to the upper flange 14 with bolts 36A and nuts 38A. The second plate portion 32A is fixed to the precast floor slab 23 by fastening bolts 37A to the insert material 41A. A plurality of rib plate portions 33A are provided at intervals in the extending direction of the angle member 3A.

The height H11 of the first beam 12A to the upper flange 14 is approximately the same as the height H2 of the beam 22 to the upper flange 25.

In the joint structure 100A between a steel beam and a precast floor slab configured in this way, the angle member 3A placed across the first beam 12A and the edge 24 of the precast floor slab 23 is connected to the upper flange 14 of the first beam 12A and the precast It is joined to the insert material 41A exposed at the edge 24 of the floor slab 23. Therefore, since the precast floor slab 23 of the wooden part 2 is joined to the first beam 12A via the angle material 3A, even if the precast floor slabs of the steel structure part 1 and the wooden part 2 have different floor thicknesses, the angle material By adjusting the height of 3A, the floor thickness of the precast floor slab can be absorbed and the precast floor slab 23 can be joined to the first beam 12A.

Moreover, the precast floor slab 23 can be directly supported by the first beam 12A.

Note that the various shapes and combinations of the constituent members shown in the above-described embodiments are merely examples, and various changes can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the embodiment shown above, the wooden part 2 made of wood is used as an example of the other structural part, but the present invention is not limited to this. The other structural parts may be constructed of a structure other than a steel frame structure, and may be a reinforced concrete part constructed of reinforced concrete.

1 Steel structure 2 Wooden structure (other structures)
3 Angle material (joining material)
12A 1st beam (steel beam)
14 Upper flange 23 Precast floor slab 24 Edge 31 First plate portion 31a Long hole 32 Second plate portion 33 Rib plate portion 36 Bolt (first joint)
37 bolts (second joint)
41 Insert material 100 Joint structure between steel beam and precast floor slab

Claims (9)

A steel beam installed in a steel frame structure,
A floor slab installed in the steel structure,
A precast floor slab placed adjacent to the steel structure and installed in another structure made of a structure other than the steel structure;
an insert material buried so as to be exposed at the edge facing the steel beam side of the precast floor slab;
a bonding material disposed across the steel beam and the edge;
a first joint portion that joins the steel beam and the joint material;
a second joint part that joins the joining material and the insert material,
A joint structure between a steel beam and a precast floor slab, wherein the thickness of the floor slab installed in the steel frame structure is different from the thickness of the precast floor slab. The joint structure of a steel beam and a precast floor slab according to claim 1, wherein the floor slab installed in the steel frame structure is placed on the steel beam. The joint structure of a steel beam and a precast deck according to claim 1, wherein the precast deck is placed on the steel beam. The joint structure between a steel beam and a precast floor slab according to claim 1 or 2, wherein the insert material is a female thread to which the second joint is fastened. The bonding material is
a first plate portion joined to the upper flange of the steel beam;
The joining structure of a steel beam and a precast floor slab according to claim 1 or 2, further comprising a second plate part that stands up from the first plate part and is joined to the insert material. 6. The joining structure of a steel beam and a precast floor slab according to claim 5, wherein the first plate portion has a long hole formed in a direction perpendicular to the axial direction of the steel beam. The bonding material is
The joining structure of a steel beam and a precast deck according to claim 5, wherein the first plate part and the second plate part are joined, and the steel beam has a plurality of rib plate parts provided in the axial direction of the steel beam. The joining structure between a steel beam and a precast floor slab according to claim 1 or 2, wherein the first joint is a bolt that joins the steel beam and the joining material. The joint structure between a steel beam and a precast floor slab according to claim 1 or 2, wherein the second joint is a bolt that joins the joint material and the insert material.

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