JP2022118424A - Beam floor junction structure - Google Patents

Abstract

To provide a beam floor junction structure for a wooden beam and a floor slab made of cast-in-place concrete, which can be easily formed and can secure stable shear capacity in a stable state for a long period of time.SOLUTION: A beam floor junction structure includes shear force transmission means 13 that is provided at a junction between a wooden beam 11 and a concrete floor slab 12 to transmit force in a shearing direction along the junction. The shear force transmission means 13 is formed by integrating: a lattice-like face material 16 for construction formed by making a lower stage band plate layer 14 that is fixed on an upper surface of the wooden beam 11 and is made of a plurality of elongate band-like plate materials 14a arranged in parallel and an upper stage band plate layer 15 made of a plurality of elongate band-like plate materials 15a arranged in parallel cross obliquely and overlap in a lattice shape; and a concrete component that at the time of installing cast-in-place concrete, has solidified after entering interval portions 14b of the plurality of band-like plate materials 14a of the lower stage band plate layer 14 and interval portions 15b of the plurality of band-like plate materials 15a of the upper stage band plate layer 15 in a continuous state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a beam-to-floor joint structure, and more particularly to a beam-to-floor joint structure for integrally joining a wooden beam and a concrete floor slab formed by pouring cast-in-place concrete on the upper surface of the wooden beam. Regarding.

For example, in middle- and low-rise buildings, it is common for wooden buildings to be built using wood for the entire frame, and for reinforced concrete buildings, the entire frame to be built using concrete. be. In recent years, it has become possible to form structural members with large cross-sections by using laminated lumber, preferably made of wood, so it has become possible to construct larger buildings as wooden buildings. However, on the other hand, even when laminated lumber is used, there is a limit to how large a building can be built using lumber alone.

For this reason, by combining the structural part made of wood and the structural part made of concrete, it has a composite structure of wood and concrete that combines the increased strength of concrete and the warmth of the exterior and interior of wood. Various buildings have been developed. As a composite structure of such a building, for example, a beam-to-floor joint structure has been proposed, in which exposed wooden beams are supported, and a concrete floor slab is provided on the upper surface of the exposed beams. A technique has also been developed to facilitate the integration of the wooden beams and the floor slab by forming the floor slab provided on the upper surface of the wooden beam using cast-in-place concrete (for example, Patent Documents 1 to 3 reference). For example, by using exposed wooden beams, it is possible to provide a space with a wooden feel, and concrete floor slabs are effective in ensuring livability such as noise and floor vibrations on the upper and lower floors. Furthermore, the development of wooden beams with fire resistance has made it possible to use wooden beams even in properties subject to fire resistance restrictions.

In addition, in the beam-to-floor joint structure between a wooden beam and a floor slab made of cast-in-place concrete described in Patent Documents 1 to 3, the force in the shear direction along the joint between the wooden beam and the concrete floor slab is In order to efficiently transmit between members, grooves that intersect in plan view are provided on the upper surface of the wooden beam, and these grooves are filled with cast-in-place concrete and solidified (see Patent Document 1). Place cast-in-place concrete while enveloping hardened cement with unevenness on the surface fixed via a lag screw to the upper surface (see Patent Document 2), or project a steel plate or steel rod from the upper surface of a wooden beam. Then, by placing cast-in-place concrete while entraining these steel materials (see Patent Document 3), the shear strength can be ensured.

Japanese Patent No. 5930609 Japanese Patent No. 6010430 Japanese Patent No. 6592958

However, in the beam-to-floor joint structure of wooden beams and floor slabs made of cast-in-place concrete described in Patent Documents 1 to 3, the work of processing intersecting grooves on the upper surface of the wooden beams in plan view and cement hardening with unevenness Since the work of forming the body and the work of processing and attaching steel plates and steel bars require a lot of time and effort, it is necessary to ensure shear strength in a more stable state over a long period of time. Development of a new beam-to-floor joint structure is desired.

The present invention provides a beam-to-floor joint between a wooden beam and a floor slab made of cast-in-place concrete, which can be easily formed without much labor and can secure shear strength in a more stable state over a long period of time. It is intended to provide structure.

The present invention provides a beam-to-floor joint structure for integrally joining a wooden beam and a concrete floor slab formed by placing cast-in-place concrete on the upper surface of the wooden beam, wherein the wooden beam and the It has a shear force transmission means provided at a joint portion with a concrete floor slab for transmitting a force in a shear direction along the joint portion between these members, and the shear force transmission means is connected to the wooden floor slab. A lower strip layer consisting of a plurality of spaced parallel elongated strips fixed integrally to the upper surface of the beam and an upper strip layer consisting of a plurality of similarly spaced parallel elongated strips. A grid-like surface material for construction formed by stacking plate layers obliquely across the axial direction of the wooden beams in a grid-like manner, and the lower band plate layer at the time of placing the cast-in-place concrete. A beam-to-floor joint structure in which a space between a plurality of strip-shaped plate materials that form the upper strip layer and a concrete portion that has entered and solidified in a state that is continuous with the space between the plurality of strip-shaped plate materials that constitute the upper strip layer are integrally formed. The above object is achieved by providing

In the beam-to-floor joint structure of the present invention, the wooden beams are provided at the portions where the spaced portions of the plurality of strip-shaped plate materials constituting the lower strip layer and the spaced portions of the plurality of strip-shaped plate materials which constitute the upper strip layer overlap. A metal rod-shaped hardware driven from above toward the above is embedded in the concrete floor slab with the upper part erected from the upper surface of the wooden beam above the lattice-like panel material for construction. preferably.

Further, in the beam-to-floor joint structure of the present invention, the wooden beam comprises a load-bearing layer that bears the load, and a fire-resistant beam that includes a covering layer that surrounds both side surfaces and the lower surface of the load-bearing layer. It is preferable that

Further, in the beam-to-floor joint structure of the present invention, the wooden beams are coated with a load-bearing layer that bears the load, and a coating material made of flame-retardant chemical-infused wood that surrounds both side surfaces and the lower surface of the load-bearing layer. Preferably, the refractory beam comprises a layer and veneers surrounding the sides and bottom of the covering layer.

Furthermore, the beam-to-floor joint structure of the present invention comprises a load-bearing layer in which the wooden beam is a load-bearing portion, a side-covering layer made of wood covering both side surfaces of the load-bearing layer, and the load-bearing layer. It is preferable that the fire-resistant beam is provided with a lower surface coating layer made of a reinforcing gypsum board covering the lower surface of the support layer, and a wooden decorative material surrounding both side surfaces and the lower surface of the lower surface coating layer.

Further, in the beam-to-floor joint structure of the present invention, reinforcements are attached at intervals in the axial direction of the wooden beam so as to straddle the coating layers on both sides of the load bearing layer or the upper surfaces of the side coating layers on both sides. Steel materials for construction are embedded in the concrete floor slab, and the grid-like face material for construction is fixed integrally to the upper surface of the wooden beam in a divided state at the portion where the steel materials for reinforcement are attached. It is preferable that

Further, in the beam-to-floor joint structure of the present invention, the wooden beam comprises a wooden load-bearing layer, an incombustible first covering member covering both sides of the load-bearing layer in one direction of the cross section, and A wooden embers layer fixed to the outside of each of the first covering members via a spacer so as to have a gap between the first covering member and the load supporting layer in the orthogonal direction perpendicular to the one direction and a second covering member covering one or both sides of the fire resistant wooden structural member, wherein the outer surface side of each of the first covering members on the one or both sides having the second covering member in the orthogonal direction has a noncombustible A corner reinforcing member is disposed, and the corner reinforcing member partially or completely overlaps the outer surface of the first covering member and partially extends from one end of the load bearing layer in the orthogonal direction. It is preferable that the corner reinforcing member partially narrows the one-way length of the gap or partially eliminates the gap.

According to the beam-to-floor joint structure of the wooden beam and the floor slab made of cast-in-place concrete of the present invention, it can be easily formed without requiring much labor, and the shear strength can be secured in a more stable state over a long period of time. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a cross-sectional view, FIG. 1B is a perspective view of a wooden beam part, and FIG. . (a) is a cross-sectional view, (b) is a perspective view of a wooden beam portion, and (c) is a top view of a wooden beam portion, illustrating a beam-to-floor joint structure according to a preferred second embodiment of the present invention. . (a) is a cross-sectional view, (b) is a perspective view of a wooden beam portion, and (c) is a top view of a wooden beam portion, illustrating a beam-to-floor joint structure according to a preferred third embodiment of the present invention. . (a) is a cross-sectional view, (b) is a perspective view of a wooden beam portion, and (c) is a top view of a wooden beam portion, illustrating a beam-to-floor joint structure according to a preferred fourth embodiment of the present invention. . FIG. 4 is a cross-sectional view illustrating another preferred embodiment of the present invention;

A beam-to-floor joint structure 10 according to a preferred first embodiment of the present invention is a composite structure made of wood and concrete. For example, as shown in FIG. It is used as a joint structure for joining and integrating. The beam-to-floor joint structure 10 of the first embodiment makes it possible to form a building having a composite structure of wood and concrete, which combines the increased strength of concrete with the warmth of the exterior and interior of wood. At the same time, it can be easily installed without requiring a lot of labor, and the beam made of wood and the floor slab made of concrete, which are materials with different physical properties, can be firmly joined, and in a more stable state over a long period of time. It has a function to ensure shear strength in the direction along the joint.

The beam-to-floor joint structure 10 of the first embodiment is formed by placing a wooden beam 11 and cast-in-place concrete on the upper surface of the wooden beam 11, as shown in FIGS. A joint structure for integrally joining the concrete floor slab 12, which is provided at the joint portion between the wooden beam 11 and the concrete floor slab 12 to absorb the forces in the shear direction along the joint portion. It has a shear force transmission means 13 for transmitting between the members. The shear force transmission means 13 are formed by a lower strip layer 14 consisting of a plurality of spaced parallel strips 14a integrally fixed to the upper surface of the wooden beam 11 and similarly spaced parallel A building grid-like surface material 16 formed by superimposing an upper strip layer 15 made up of a plurality of arranged elongated strip-shaped plates 15a obliquely crossing the axial direction X of the wooden beams 11 in a grid shape; At the time of placing the cast-in-place concrete, it penetrates into the interval portions 14b of the plurality of strip-shaped plate members 14a forming the lower strip layer 14 and the interval portions 15b of the plurality of strip-shaped plate members 15a forming the upper strip layer 15 in a continuous state. It is formed integrally with the solidified concrete portion.

Further, in the first embodiment, in the portion where the spacing portions 14b of the plurality of strip-shaped plate members 14a constituting the lower strip layer 14 and the spacing portions 15b of the plurality of strip-shaped plate members 15a constituting the upper strip layer 15 overlap, the wooden beams 11 is embedded in the concrete floor slab 12 with the upper part erected from the upper surface of the wooden beam 11 above the grid-like surface material 16 for construction. It is

In the first embodiment, the wooden beams 11 can be formed using wooden beams made of various materials known as structural lumber constituting a frame structure. The wooden beams 11 are preferably made of laminated wood obtained by laminating a plurality of plate materials lumbered from small-diameter logs via an adhesive, as described in Japanese Patent Application Laid-Open No. 2007-268731. can be formed. The wooden beams 11 are made of structural lumber having a width of, for example, about 45 mm to 200 mm, which is generally distributed as structural lumber. It has a rectangular (including square) cross-sectional shape with a width of about 45 mm to 1500 mm in the direction (horizontal width) and a width of about 90 mm to 1500 mm in the vertical direction perpendicular to the horizontal direction (vertical width). It is formed to have a length of about 15000 mm. The wooden beam 11 is supported at both ends by another wooden beam member extending in a direction perpendicular thereto and by a pillar member, and is mounted in a state of being suspended between these members.

As the cast-in-place concrete to be placed on the upper surface of the wooden beam 11, various known fluid concretes that have not yet hardened and are used in construction work can be used. The cast-in-place concrete can be, for example, temporary formwork shoring (not shown) erected in the area between each adjacent wooden beam 11, or a deck plate (not shown) erected between each adjacent wooden beam 11. A concrete floor slab 12 having a predetermined thickness is formed by placing appropriate reinforcing bars above the slab, placing them in a predetermined thickness, and solidifying them.

The shear force transmission means 13 provided at the joint between the wooden beam 11 and the concrete floor slab 12 to transmit the force in the shear direction along the joint between these members, as described above, includes a plurality of A lower strip layer 14 and an upper strip layer 15 made of elongated strips 14a and 15a are obliquely crossed to form a grid-like surface material 16 for building, and a plurality of strips of the lower strip layer 14. 14a and the concrete portion that has entered and solidified continuously into the space portions 14b of the plurality of strip-shaped plate members 15a of the upper strip layer 15. As shown in FIG.

The architectural lattice panel 16 is preferably similar in construction to wall finishing panels known as "Kizure Panels" (registered trademark) and used in the wall finishing structure described in Japanese Patent No. 3162676, for example. can be used. That is, the architectural grid-like surface material 16 is a panel member that can also be used as a base material for finishing the wall of a building, and is joined and integrated as shown in FIGS. It consists of a lower strip layer 14 and an upper strip layer 15 . Each of the lower strip layer 14 and the upper strip layer 15 is constructed by arranging a large number of strip members 14a and 15a in parallel in an inclined direction at predetermined intervals 14b and 15b. Further, the strip-shaped plate members 14a forming the lower strip layer 14 and the strip-shaped plate members 15a forming the upper strip layer 15 are arranged so as to be inclined in opposite directions so as to intersect with each other. By bonding and integrating the strip-like plate material 14a of the lower strip layer 14 and the strip-like plate material 15a of the upper strip plate layer 15 with an adhesive or the like, the grid-like surface material 16 for construction can be obtained.

Such architectural grid-like surface material 16 is formed in advance with high precision in a factory or the like, and after it is brought into the construction site of the building, it is formed into a predetermined shape corresponding to the shape of the upper surface of the wooden beam 11. It can be integrally fixed to the wooden beam 11 by being cut and bonded to the upper surface of the wooden beam 11 with an adhesive or the like. Further, the architectural grid-like surface material 16 is formed by placing a plurality of strip-shaped plate members 14a of the lower strip plate layer 14 on the upper surface of the wooden beam 11 at predetermined intervals 14b with an adhesive or the like at the construction site of the building. Then, a plurality of strip-shaped plate members 15a of the upper strip plate layer 15 are attached to the upper surface of the upper strip plate layer 15 at predetermined intervals 15b with an adhesive or the like. It can also be fixed to the upper surface of the wooden beam 11 by work at the construction site without using anything.

Here, in the first embodiment, each of the plurality of strip-shaped plates 14a and 15a constituting the lower strip layer 14 and the upper strip layer 15 of the grid-like surface material 16 for construction has a width of, for example, about 30 to 120 mm. A belt-like plate member having a cross section with a thickness of about 8 to 40 mm and having the same material, shape, etc. as the small width plate used for the conventional wooden lath base, for example, can be used. In addition, the plurality of strip-shaped plate members 14a and 15a that constitute the lower strip layer 14 and the upper strip layer 15 are arranged in the axial direction X of the wooden beam 11 with intervals 14b and 15b of, for example, 35 to 100 mm. In addition, the strip-shaped plate members 14a forming the lower strip layer 14 and the strip-shaped plate members 15a forming the upper strip layer 15 intersect with each other. , symmetrical to the axial direction X of the wooden beam 11 and inclined in opposite directions. That is, the respective strip-shaped plate members 14a and 15a are arranged in a grid pattern that intersects each other at right angles and is inclined by 45 degrees.

Further, according to the first embodiment, the space 14b between the strips 14a forming the lower strip layer 14 and the space 15b between the strips 15a forming the upper strip layer 15 are also made of wood. They are arranged to be inclined at an angle of 45 degrees with respect to the axial direction X of the wooden beam 11, and cross each other at right angles in different directions symmetrical with respect to the axial direction X of the wooden beam 11. The spaced portions 14b and 15b are arranged in a lattice pattern inclined by 45 degrees in opposition to each other, and communicate with each other at their crossing portions.

As a result, in the first embodiment, when cast-in-place concrete in a fluid state is placed above the wooden beams 11, the concrete in the concrete includes, for example, the mortar in the concrete and the thickness of the lower strip layer 14. Concrete containing only coarse aggregate having a grain size equal to or smaller than the thickness of the strips 14a spreads not only in the gaps 15b between the strips 15a of the upper strip layer 15 but also in the lower strip layer continuous therewith. After entering and filling the gaps of the space portions 14b between the strip-shaped plate members 14a that constitute the 14, the resin solidifies. Further, as a result, at the junction between the wooden beam 11 and the concrete floor slab 12, the strip-shaped plate material 14a of the lower strip layer 14, the strip-shaped plate material 15a of the upper strip plate layer 15, and the continuous gap portions 14b, 15b are formed. A strong shear force transmission means 13 is formed by engaging with the cast-in-place concrete that has been filled and solidified in the space and is mixed and integrated with each other. In this embodiment, the long-term shear strength of wood and the long-term shear strength of concrete are controlled by the shear force transmission means 13 formed by mutually engaging the wooden building grid-like surface material 16 and concrete in such a state. It is possible to firmly support the force in the shear direction along the joint without losing the balance, and between the members of the wooden beam 11 and the concrete floor slab 12, the joint It becomes possible to efficiently transmit the force in the shear direction along the .

Therefore, according to the beam-to-floor joint structure of the first embodiment, on the upper surface of the wooden beam 11, a lower band plate layer 14 made up of a plurality of band-shaped plate members 14a arranged in parallel at intervals and an upper band layer 14 made up of a plurality of band-shaped plate members 15a are arranged. A building grid-like surface material 16 formed by obliquely intersecting a strip layer 15 and superimposing it in a grid shape is integrally fixed, and after that, cast-in-place concrete is placed above the wooden beams 11. Shear force transmission capable of effectively transmitting the force in the shear direction along the joint between the members of the wooden beam 11 and the concrete floor slab 12 without requiring much labor by a simple configuration of only The means 13 can be easily formed and joints made of these members can be made more durable over the long term by avoiding the imbalance between the long-term shear strength of wood and the long-term shear strength of concrete. It becomes possible to ensure shear strength in a stable state.

In addition, in the first embodiment, in the portion where the spacing portions 14b of the plurality of strip-shaped plate members 14a forming the lower strip layer 14 and the spacing portions 15b of the plurality of strip-shaped plate members 15a forming the upper strip layer 15 overlap each other, as shown in FIG. As shown in (a), preferably a lag screw is driven into the wooden beam 11 from above as a metal bar 17, the upper part of which extends from the upper surface of the wooden beam 11 to the upper part of the lattice-like surface material 16 for construction. It can also be buried in the concrete floor slab 12 in an upright state. A plurality of metal bars 17 can be attached at predetermined intervals in the axial direction X of the wooden beam 11 (see FIGS. 1(b) and 1(c)). This effectively reinforces the shear force transmission means 13 for transmitting the force in the shear direction along the joint between the members of the wooden beam 11 and the concrete floor slab 12, so that the joint of these members is strengthened. , it becomes possible to secure shear strength in a more stable state over a long period of time.

2(a) to (c) show a beam-to-floor joint structure 20 according to a preferred second embodiment of the present invention. In the beam-to-floor joint structure 20 according to the second embodiment shown in FIGS. It has substantially the same configuration as the beam-to-floor joint structure 10 of one embodiment. Regarding the beam/floor joint structure 20 of the second embodiment shown in FIGS. 2(a) to (c), the structural parts different from the beam/floor joint structure 10 of the first embodiment will be mainly described, and the same structural parts will be explained. are given the same reference numerals and their description is omitted. The description of the beam-to-floor joint structure 10 of the first embodiment is appropriately applied to components that are not particularly mentioned.

In the beam-to-floor joint structure 20 of the second embodiment shown in FIGS. 2(a) to 2(c), the wooden beam 21 includes a load bearing layer 21a serving as a load-bearing portion, and side surfaces and a lower surface on both sides of the load bearing layer 21a. It is a fire-resistant beam provided with a coating layer 21b that surrounds and serves as a burning margin layer with a coating material.

In the second embodiment, the shear force transmission means 23 is constructed by stacking a lower strip layer 14 of strip-shaped plate members 14a and an upper strip layer 15 of strip-shaped plate members 15a in a lattice shape. The panel 16 is integrally fixed to the upper surface of the load-bearing layer 21a portion of the wooden beam 21, and the cast-in-place concrete covers the entire fixed architectural grid-like panel 16 to support the load. The concrete floor slab 12 integrated with the wooden beams 21 is formed by casting and solidifying on the upper surface of the layer 21a and the embers layer (coating layer) 21b on both sides. In addition, at the portion where the space portion 14b of the lower strip layer 14 and the space portion 15b of the upper strip plate layer 15 overlap, the wooden beam 21 is driven from above toward the wooden beam 21 at a predetermined interval in the axial direction X of the wooden beam 21. A metal rod-shaped hardware 17 is buried in the concrete floor slab 12 in a state of standing from the upper surface of the wooden beam 21. - 特許庁

Also in the beam-to-floor joint structure 20 of the second embodiment, at the joint between the wooden beam 21 and the concrete floor slab 12, the strip-shaped plate material 14a of the lower strip layer 14 of the lattice-like surface material 16 for construction and the upper strip plate The band-shaped plate material 15a of the layer 15 and the cast-in-place concrete filled and solidified in the continuous space portions 14b and 15b are engaged with each other in a mixedly integrated state, so that the Since the shearing force transmission means 23 capable of firmly supporting the force in the shearing direction is formed, the same effects as those of the beam-to-floor joint structure 10 of the first embodiment are achieved. .

FIGS. 3(a) to 3(c) show a beam-to-floor joint structure 30 according to a third preferred embodiment of the present invention. In the beam-to-floor joint structure 30 according to the third embodiment shown in FIGS. It has substantially the same configuration as the beam-to-floor joint structure 10 of one embodiment. Regarding the beam/floor joint structure 30 of the third embodiment shown in FIGS. 3(a) to (c), the structural parts different from the beam/floor joint structure 10 of the first embodiment will be mainly described, and the same structural parts will be explained. are given the same reference numerals and their description is omitted. The description of the beam-to-floor joint structure 10 of the first embodiment is appropriately applied to components that are not particularly mentioned.

In the beam-to-floor joint structure 30 of the third embodiment shown in FIGS. The fire-resistant beam is provided with a covering layer 31b, which is made of a surrounding covering material made of flame-retardant chemical-infused wood, serving as a burning margin layer, and a decorative material 31c surrounding the side surface and the lower surface of the covering layer 31b.

In the third embodiment, the shear force transmission means 33 is constructed by superimposing the lower band plate layer 14 of the band-shaped plate members 14a and the upper band plate layer 15 of the band-shaped plate members 15a in a lattice shape. The panel 16 is integrally fixed to the upper surface of the load-bearing layer 31a of the wooden beam 31, and the cast-in-place concrete covers the entire fixed grid-like panel 16 for load support. A concrete floor integrated with the wooden beams 31 by being placed on the upper surface of the layer 31a, the flame-retardant chemical-infused wood burning layer (coating layer) 31b on both sides, and the decorative material 31c on both sides and solidified. A slab 12 is formed. In addition, at the portion where the space portion 14b of the lower strip plate layer 14 and the space portion 15b of the upper strip plate layer 15 overlap, a predetermined interval is set in the axial direction X of the wooden beam 31, and the shaft is driven toward the wooden beam 31 from above. A metal rod-shaped hardware 17 is embedded in the concrete floor slab 12 in a state of being erected from the upper surface of the wooden beam 31. - 特許庁

Also in the beam-to-floor joint structure 30 of the third embodiment, at the joint between the wooden beam 31 and the concrete floor slab 12, the strip-shaped plate material 14a of the lower strip layer 14 of the lattice-like surface material 16 for construction and the upper strip plate The band-shaped plate material 15a of the layer 15 and the cast-in-place concrete filled and solidified in the continuous space portions 14b, 15b are engaged with each other in a mixedly integrated state, thereby Since the shearing force transmission means 33 capable of firmly supporting the force in the shearing direction is formed, the same effect as the beam-to-floor joint structure 10 of the first embodiment can be achieved. Become.

FIGS. 4(a) to 4(c) show a beam-to-floor joint structure 40 according to a preferred fourth embodiment of the present invention. In the beam-to-floor joint structure 40 according to the fourth embodiment shown in FIGS. It has substantially the same configuration as the beam-to-floor joint structure 10 of one embodiment. Regarding the beam/floor connection structure 40 of the fourth embodiment shown in FIGS. 4(a) to 4(c), the different components from the beam/floor connection structure 10 of the first embodiment will be mainly described, and the same components will be described. are given the same reference numerals and their description is omitted. The description of the beam-to-floor joint structure 10 of the first embodiment is appropriately applied to components that are not particularly mentioned.

In the beam-to-floor joint structure 40 of the fourth embodiment shown in FIGS. 4(a) to 4(c), the wooden beams 41 are composed of a load bearing layer 41a serving as a load-bearing portion, and wooden beams covering both side surfaces of the load bearing layer 41a. and a lower surface covering layer 41c serving as a fireproof layer and both sides of the lower surface covering layer 41c made of a covering material consisting of a reinforced gypsum board covering the lower surface of the load supporting layer. It is a fireproof beam provided with a facing material 41d made of wood surrounding the side and bottom surfaces of the .

In addition, in the beam-to-floor joint structure 40 of the fourth embodiment shown in FIGS. Reinforcing steel members 44 attached at intervals in the axial direction X of a certain wooden beam 41 are embedded in the concrete floor slab 12, and the reinforcing steel members 44 are attached to the building grid-like panel 16. At the cut portion, it is integrally fixed to the upper surface of the wooden beam 41 in a divided state.

In the fourth embodiment, the shear force transmission means 43 is constructed by superimposing the lower strip layer 14 made of the strip-shaped plate material 14a and the upper strip layer 15 made of the strip-shaped plate material 15a in a grid pattern. The grid panel 16 is integrally fixed to the upper surface of the load-bearing layer 41a of the wooden beam 41, and the cast-in-place concrete is applied to the fixed architectural grid panel 16 and the reinforcing steel material 44 as a whole. The concrete floor slab 12 integrated with the wooden beams 41 is formed by casting and solidifying the upper surfaces of the load supporting layer 41a and the side covering layer 41b, which is the flammable layer on both sides, so as to cover it. ing. In addition, at the portion where the interval portion 14b of the lower strip layer 14 and the interval portion 15b of the upper strip plate layer 15 overlap, a predetermined interval is set in the axial direction X of the wooden beam 41, and the shaft is driven toward the wooden beam 41 from above. A metal rod-shaped hardware 17 is embedded in the concrete floor slab 12 in a state of standing from the upper surface of the wooden beam 41. - 特許庁

Also in the beam-to-floor joint structure 40 of the fourth embodiment, at the joint between the wooden beam 41 and the concrete floor slab 12, the strip-shaped plate members 14a of the lower strip layer 14 of the architectural grid-like surface material 16 and the upper strip plate are provided. The band-shaped plate material 15a of the layer 15 and the cast-in-place concrete filled and solidified in the continuous space portions 14b, 15b are engaged with each other in a mixedly integrated state, thereby Since the shearing force transmission means 43 capable of firmly supporting the force in the shearing direction is formed, the same effect as the beam-to-floor joint structure 10 of the first embodiment can be obtained. Become.

Further, according to the beam-to-floor joint structure 40 of the fourth embodiment, a plurality of reinforcing steel materials 44 are attached at intervals in the axial direction X of the wooden beam 41 so as to straddle the upper surfaces of the side covering layers 41b on both sides. As a result, the load supporting layer 41a and the side covering layers 41b covering the side surfaces on both sides thereof are not separated, making it possible to facilitate manufacturing and construction at the site. Further, when pouring unhardened, fluid concrete on the formwork, it is not necessary to place the formwork such as a deck plate or a half-precast plate on the load support layer 41a. The reinforcing steel material 44 may be attached to the upper surface of the wooden beam 41, or may be attached by providing a groove in the upper surface of the wooden beam.

It should be noted that the present invention can be modified in various ways without being limited to the above embodiments. For example, at the portion where the spacing between the lower strip layer and the spacing between the upper strip layers of the lattice-like surface material for construction overlap, a metal bar is driven into the concrete floor slab by driving it toward the wooden beam. It does not necessarily have to be embedded. As shown in FIG. 5, the wooden beams 51 to which the architectural grid-like panels 16 are provided at the joints with the concrete floor slab 12 are composed of a wooden load-bearing layer 51a and both sides of the load-bearing layer 51a in one direction Y. and a embers layer fixed to the outside of each of the first covering members 51b in one direction Y via a spacer 51c so as to have a gap 51e between the first covering member 51b and the first covering member 51b. 51d and a second covering member 51f covering one or both sides of the load bearing layer 51a in the orthogonal direction Z, wherein on one or both sides having the second covering member 51f in the orthogonal direction Z, A corner reinforcing member 51g is arranged on the outer surface side of each of the first covering members 51b. The corner reinforcing member 51g partially narrows the one-direction length of the gap 51e or partially eliminates the gap 51e. It can be anything that exists.

10, 20, 30, 40, 50 Beam-floor joint structure 11 Wooden beam 12 Concrete floor slab 13, 23, 33, 43, 53 Shear force transmission means 14 Lower strip layer 14a Strip-shaped plate material 14b Spacing part 15 Upper strip layer 15a strip-shaped plate material 15b interval part 16 grid-like surface material for construction 17 metal rod-shaped hardware (lag screw)
21 wooden beam 21a load bearing layer 21b covering layer 31 wooden beam 31a load bearing layer 31b covering layer 31c decorative material 41 wooden beam 41a load supporting layer 41b side covering layer 41c lower surface covering layer 41d decorative material 44 reinforcing steel material 51 wooden beam 51a load Supporting layer 51b First covering member 51c Spacer 51d Cinder layer 51e Gap 51f Second covering member 51g Corner reinforcing member X Axial direction Y of wooden beam One direction Z Orthogonal direction

Claims (7)

A beam-to-floor joint structure for integrally joining a wooden beam and a concrete floor slab formed by placing cast-in-place concrete on the upper surface of the wooden beam,
a shear force transmission means provided at a joint between the wooden beam and the concrete floor slab for transmitting a force in a shear direction along the joint between these members;
Said shear transmission means are similarly spaced and parallel with a lower strip layer of a plurality of spaced and parallel elongated strips integrally secured to the upper surface of said wooden beam. A grid-like surface material for construction, which is formed by stacking an upper strip layer of a plurality of elongated strip-shaped plate materials obliquely crossing the axial direction of the wooden beams in a grid-like manner, and placing cast-in-place concrete. Sometimes, the spaced portions of the plurality of strip-shaped plate materials constituting the lower strip layer and the concrete portion that has entered and solidified continuously in the spaced portions of the plurality of strip-shaped plate materials that constitute the upper strip layer are integrated. Beam-floor joint structure formed by At the portion where the spaced portions of the plurality of strip-shaped plate materials constituting the lower strip layer and the spaced portions of the plurality of strip-shaped plate materials which constitute the upper strip layer overlap, a metal rod-like shape driven into the wooden beam from above 2. The beam-to-floor joint structure according to claim 1, wherein the hardware is embedded in the concrete floor slab with its upper part erected from the upper surface of the wooden beam above the lattice panel for construction. 3. The beam according to claim 1 or 2, wherein the wooden beam is a fire-resistant beam comprising a load-bearing layer serving as a load-bearing portion, and a covering layer of a covering material surrounding both side surfaces and a lower surface of the load-bearing layer. Floor joint structure. The wooden beam includes a load-bearing layer that bears the load, a coating layer made of flame-retardant chemical-infused wood that surrounds both side surfaces and the bottom surface of the load-bearing layer, and side surfaces and the bottom surface of the coating layer. 3. The beam-to-floor joint structure according to claim 1 or 2, wherein the fire-resistant beam is provided with a decorative material surrounding the . The wooden beam is composed of a load-bearing layer that bears the load, a side-covering layer made of wood that covers both sides of the load-bearing layer, and a reinforced gypsum board that covers the lower surface of the load-bearing layer. 3. A beam-to-floor connection structure according to claim 1 or 2, which is a fire-resistant beam comprising a lower surface covering layer made of a covering material and decorative materials made of wood surrounding both side surfaces and the lower surface of the lower surface covering layer. Reinforcing steel members attached at intervals in the axial direction of the wooden beam so as to straddle the coating layers on both sides of the load bearing layer or the upper surfaces of the side coating layers on both sides are installed in the concrete floor slab. 6. The beam-to-floor joint according to claim 5, wherein the architectural lattice-like face material is integrally fixed to the upper surface of the wooden beam in a divided state at the portion where the reinforcing steel material is attached. structure. The wooden beam includes a wooden load-bearing layer, a non-combustible first covering member covering both sides of the load-bearing layer in one direction of the cross section, and a first covering member outside each of the first covering members in the one direction. A wooden embers layer fixed via a spacer so as to have a gap between the first covering member and a second covering member covering one side or both sides of the load bearing layer in the orthogonal direction perpendicular to the one direction wherein a noncombustible corner reinforcing member is disposed on the outer surface of each first covering member on one or both sides of said orthogonal second covering member, said The corner reinforcing member is arranged in a state in which a part or all of the corner reinforcing member overlaps the outer surface of the first covering member, and in a state in which a part extends from one end of the load supporting layer in the orthogonal direction. 3. The beam-to-floor connection structure according to claim 1, wherein the reinforcing member partially narrows the one-directional length of the gap or partially eliminates the gap.

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