White

Abstract

To provide a tie-in structure capable of securing fire resistance and sound insulation by eliminating the need for placing a fire-resistant seal.SOLUTION: In a tie-in structure of a floor plate composed of a plurality of half-precast plates and a fire-resistant wall or a sound insulation wall or a fire-resistant sound insulation wall, after concrete is placed on the floor plate to construct a floor, when constructing a wall under the floor plate, at least in an area where the fire-resistant wall or the sound insulation wall or the fire-resistant sound insulation wall is to be connected, at least one of the two opposing end faces of the two adjacent half precast plates is sloped so that a distance between the two opposing end faces increases toward the upper side from the fire-resistant wall or the sound insulation wall or the fire-resistant sound insulation wall side.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an attachment structure between a floor board composed of a plurality of half precast (Pca) boards and a fire wall or a sound insulation wall or a fire and sound insulation wall.

Background Art

[0002] Fire walls, sound insulation walls, or fire and sound insulation walls adopted in buildings are required to have fire resistance, sound insulation, or both in the Building Standards Act. For this reason, in the attachment between a fire wall or the like and the surrounding building structure, rock wool, fire seals, etc. are applied so that no gap is left.

[0003] There is a floor around the building structure of a fire wall or the like, and half Pca boards may be used for the floor of a building. Since half Pca boards are manufactured in factories or the like and transported to the site by truck, there are limitations in width due to transportation convenience. To construct a floor, it is necessary to arrange and install half Pca boards, but joints between half Pca boards with a gap of about 1 mm to 5 mm occur.

[0004] When a fire wall or the like is attached under a half Pca board, if the direction in which the wall extends and the direction in which the joint part extends intersect, the gap generated in the joint part becomes a problem in terms of fire prevention and sound insulation.

[0005] Conventionally, it has been dealt with by applying a fire seal on the lower surface of the joint part at the site. Since the gap generated in the joint part is narrow, it is difficult to completely fill the inside of the gap with a fire seal. Therefore, it was necessary to apply a fire seal not only to the attachment part with the wall but also over the entire length of the joint part.

[0006] Therefore, a method for joining PCA panels has been proposed in which the joining edge of the PCA panel has an inclined surface for forming a V-shaped joint groove along its entire length, notches are provided at appropriate intervals along the length of the joining edge, the connecting bars exposed in the notches are joined by welding via a reinforcing plate, an angle material is inserted into the bottom of the V-shaped joint groove, and mortar is filled throughout the entire V-shaped groove (see, for example, Patent Document 1). [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 59-96347 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, with the conventional method described above, a gap remains on the underside of the angle material even after filling with mortar, which necessitates filling that gap, at least at the joint with the wall, by applying fire-resistant sealant. Furthermore, because the angle material is installed approximately in the center of the PCA board's thickness, it is difficult to inject sealant all the way to the angle material, and if a gap remains, it becomes impossible to ensure fire resistance, sound insulation, or both. [Means for solving the problem]

[0009] The present invention has been made in view of the above problems, and is a joint structure between a floor slab composed of a plurality of half-precast boards and a fire-resistant wall or sound-insulating wall or fire-resistant sound-insulating wall, A joint structure is provided in which, when a floor is constructed by pouring concrete onto a floor slab and then constructing a wall beneath the floor slab, at least one of the two opposing end faces of two adjacent half-precast panels at the joint between the fire-resistant wall, sound-insulating wall, or fire-sound-insulating wall is inclined so that the distance between the two opposing end faces of two adjacent panels increases upward from the fire-resistant wall, sound-insulating wall, or fire-sound-insulating wall side. [Effects of the Invention]

[0010] According to the present invention, concrete flows into the joint between the half-precast panels formed into the above shape, eliminating the gaps that occur in the joints. This eliminates the need to apply fire-resistant sealant, making it possible to ensure fire resistance, sound insulation, or both. [Brief explanation of the drawing]

[0011] [Figure 1] A diagram illustrating a conventional interface structure between a floor slab composed of multiple half-PCA panels and a fire-resistant wall, soundproof wall, or fire-resistant soundproof wall. [Figure 2] A diagram showing a first example of the interface structure of this embodiment. [Figure 3] This figure shows another example of the interface portion of the interface structure shown in Figure 2. [Figure 4] This figure shows a second example of the interface structure of this embodiment. [Figure 5] This figure shows another example of the shape of the half-PCA plate used in the interface structure of this embodiment. [Modes for carrying out the invention]

[0012] Before describing the interface structure between the floorboard, which is composed of multiple half-PCA panels according to the present invention, and a fire-resistant wall, soundproof wall, or fire-resistant soundproof wall, let's briefly explain the conventional interface structure between floorboards and fire-resistant walls, etc. The interface refers to the joint between structural members and the treatment at that joint (joining method, adjustment method, etc.).

[0013] Figure 1 illustrates a conventional structure illustrating the connection between floor slabs and fire-resistant walls. Buildings such as condominiums and office buildings are constructed as multi-story structures with one or more rooms on each floor by constructing columns and beams on a foundation, building the upper and lower floors, and then constructing walls between the upper and lower floors. The walls are fire-resistant walls, soundproof walls, or fire-resistant soundproof walls, and are constructed using lightweight steel frames covered with gypsum boards, extruded cement boards, ALC (Autoclaved Lightweight Concrete: lightweight aerated concrete cured at high temperature and pressure) boards, etc. Floors can be constructed by pouring concrete on site, but in super high-rise apartment buildings, a method of pouring concrete onto half-PCA boards that have been manufactured in advance at a factory is often adopted.

[0014] Pre-fabricated boards manufactured in factories are called PCA boards, but because they are used in combination with cast-in-place concrete, PCA boards used for flooring are called half-PCA boards.

[0015] As shown in Figure 1(a), multiple half-Pca panels 11 are installed adjacent to the beam, and concrete 12 is poured onto the installed multiple half-Pca panels 11 to construct the floor vertically. After that, a fire-resistant sound-insulating wall 10 is constructed between the upper and lower floors.

[0016] The half-PCA panels 11 used for building floors have a thickness of 35mm to 70mm, and their width is limited due to transportation requirements by truck. In other words, they must be wide enough to fit in the bed of a truck. As a result, as shown in Figure 1(a), it is not possible to construct a floor with a single half-PCA panel 11, and multiple half-PCA panels 11 must be laid side by side, and concrete 12 must be poured on top to construct the floor 13.

[0017] When arranging and installing a plurality of half Pca plates 11, a joint with a gap of about 1 mm to 5 mm occurs between adjacent half Pca plates 11. Fig. 1(b) is a cross-sectional view taken along the cutting line A-A shown in Fig. 1(a). As shown in Fig. 1(b), when the fireproof sound insulation wall 10 abuts on the lower side of the joint portion 14, sound and fire smoke will pass through the gap generated in the joint portion 14, and this gap will cause problems in terms of sound insulation and fire prevention.

[0018] Regarding the gap generated in the joint portion 14, when placing the concrete 12, a part of the concrete 12 enters, filling a part of the upper side, and the remaining gap is filled with a sealing material such as a fireproof seal. Since this gap is as narrow as about 1 mm to 5 mm, it is not easy to completely fill the depth of the gap (inside the joint) from the side of the fireproof sound insulation wall 10 towards the upper concrete 12. Therefore, conventionally, not only the part that abuts on the fireproof sound insulation wall 10 but also the part that opens on the lower side of the gap as shown in Fig. 1(c), although only a part, it was necessary to fill the entire length of the joint portion 14 with the sealing material 15 and block the entire opening.

[0019] Propose a mating structure that reduces or eliminates such a difficult operation of filling the sealing material over the entire length of the joint portion 14.

[0020] Fig. 2 is a diagram showing a first example of the mating structure of the present embodiment. Fig. 2(a) is a diagram showing the state where the fireproof sound insulation wall 20 is constructed between the constructed upper and lower floors. The end faces of the two adjacent half Pca plates 21 facing each other between which the fireproof sound insulation wall 20 abuts are inclined so that the interval between them becomes larger from the side of the fireproof sound insulation wall 20 upwards.

[0021] In the example shown in Fig. 2(a), an inclined end face 22 is formed by obliquely cutting out a portion obtained by adding a construction error 2r (r is the construction error on one side centered on the wall) to the wall thickness t, which is the portion where the fireproof sound insulation wall 20 meets. However, it is not limited to this, and an inclined end face 22 may be formed by only obliquely cutting out the portion of the wall thickness t, which is the mating portion. The inclined end face 22 may be formed by using a formwork and performing box-out. Box-out is to place a box-shaped wood when placing concrete to create a cavity or the like so that the concrete does not enter. Also, the construction error 2r can be, for example, 40 mm in total with r = 20 mm on one side of the fireproof sound insulation wall 20 and r = 20 mm on the other side. Note that since this construction error is an example, it is not limited to 40 mm.

[0022] In the example shown in Fig. 2(a), an example is shown where an inclined end face 22 is formed only between two adjacent half Pca plates 21. The inclined end face 22 is formed between all adjacent pairs of half Pca plates 21 at the portion where the fireproof sound insulation wall 20 meets.

[0023] Fig. 2(b) is a cross-sectional view taken by cutting the central portion of the thickness of the fireproof sound insulation wall 20 when viewed in the direction shown by the arrow B in Fig. 2(a). The end faces 22 of two adjacent half Pca plates 21 are shaped such that the distance between the end faces 22 increases upward from the lower fireproof sound insulation wall 20. Therefore, the cross-sectional shape of the gap between the end faces 22 is V-shaped.

[0024] The half Pca plate 21 is provided with a protrusion 24, and the protrusion 24 can improve the adhesion with the concrete ②3 cast after the installation of the half Pca plate 21. The protrusion 24 can be provided as needed, and its shape, size, position, and number can be any shape, size, position, and number.

[0025] When concrete 23 is poured after the installation of the half-PCA board 21, in the conventional joint structure shown in Figure 1, the aggregate constituting the concrete 23 contains coarse aggregate with a particle size of 5 mm or more. Because the coarse aggregate blocks the entrance to the narrow gap of about 1 mm to 5 mm, even if components with smaller particle sizes other than the coarse aggregate (such as fine aggregate or cement) try to enter the gap, they have difficulty entering, and the fluidity is lost and hardens near the entrance of the gap. Therefore, simply pouring concrete 23 can only fill the area near the entrance of the gap.

[0026] On the other hand, in the joint structure according to this embodiment shown in Figure 2, the gap created in the joint portion 25 by the inclined end faces 22 of the two half Pca plates 21 forms a V shape, and the upper side, which is the side into which the concrete 23 is poured, is wide open, so the concrete 23 can enter into the gap in the joint portion 25 and fill the gap. Furthermore, the gap in the joint portion 25 becomes smaller as it approaches the fire-resistant sound-insulating wall 20 side, and at the very bottom of the joint portion 25, there is only a gap of about 1 mm to 5 mm, as in the conventional method. Therefore, even if it tries to escape to the outside through that gap, it becomes difficult to do so, and the concrete loses its fluidity and hardens near the bottom. For this reason, even if the poured concrete 23 leaks out to the fire-resistant sound-insulating wall 20 side, it is only a small amount, and since the concrete 23 fills up to the bottom, there is no gap, and it becomes unnecessary to fill the gap with a sealant.

[0027] In the example shown in Figure 2(b), the end face 22 of the half-PCA plate 21 is formed by only one inclined surface that is inclined at a constant angle from one surface of the half-PCA plate 21 to the other. The angle can be, for example, 30° to 60° with respect to the thickness direction (vertical direction), but is not limited to this. The end face of the half-PCA plate 21 is not limited to being formed by only one inclined surface, but may also be composed of two surfaces, a first surface 26 and an inclined surface 27, along the thickness direction (same as the vertical direction) of the half-PCA plate 21, as shown in Figure 3.

[0028] Figure 3(a) is a cross-sectional view taken through the central part of the thickness of the fire-resistant sound-insulating wall 20, Figure 3(b) is a cross-sectional view taken along the cutting line CC in Figure 3(a), and Figure 3(c) is a cross-sectional view taken along the cutting line DD in Figure 3(a).

[0029] The first surface 26 is parallel to the vertical direction and is positioned approximately parallel to the first surface 26 of adjacent half-Pca panels 21, facing each other. The spacing d between the first surfaces 26 is about 1 mm to 5 mm, the same as the spacing between the end faces of conventional half-Pca panels 21. Therefore, if the length L of the first surface 26 in the thickness direction of the half-Pca panel 21 is long, it becomes impossible to fill the gap between the first surfaces 26 with concrete 23.

[0030] The length L in the thickness direction of the half-PCA plate 21, which allows the gap between the first surfaces 26 to be filled with concrete 23, is approximately 10 mm. Therefore, when the thickness of the half-PCA plate 21 is 35 mm, the length L of the first surface 26 can be set to 10 mm, and the remaining 25 mm can be cut out at an angle to form an inclined surface 27. Also, when the thickness of the half-PCA plate 21 is 70 mm, the length L of the first surface 26 can be set to 10 mm, and the remaining 60 mm can be cut out at an angle to form an inclined surface 27. Here, the length L of the first surface 26 is set to 10 mm, but any length of 10 mm or less is acceptable.

[0031] Figure 4 shows a second example of the interface structure of this embodiment. In the first example shown in Figure 2, the end faces 22 of two adjacent half-PCA plates 21 were formed as inclined surfaces. However, as shown in Figure 4(a), the other end face 22a may be a surface parallel to the vertical, as in the conventional method, and only one end face 22b may be formed as an inclined surface. This is because if only one end face 22b is formed as an inclined surface, it will open up significantly on the upper side, which is the side into which the concrete 23 is poured. As shown in Figure 4(b), the concrete 23 can be filled into the gap through this opening, almost completely filling the gap. Note that in Figure 4, one end face 22b is formed as an inclined surface, but one end face 22b may be formed from a first surface 26 and an inclined surface 27, as shown in Figure 3.

[0032] Figure 5 shows an example of another shape of the half-Pca panel 21 used in the interface structure of this embodiment. In the examples shown in Figures 2 and 4, an inclined surface is formed only in the portion of the fire-resistant sound-insulating wall 20 with a construction error of 2r added to the wall thickness t. However, as shown in Figure 5, the entire end face 28 in the long-side direction of the half-Pca panel 21 may be formed as an inclined surface. Note that the end face in the short-side direction of the half-Pca panel 21 is the surface in contact with the beam and therefore does not form a joint between the half-Pca panels 21.

[0033] As shown in the examples in Figures 2 and 4, when forming an inclined surface at a specific location, it is time-consuming to attach a notching material to create a notch in order to form the inclined surface 27, and the interface with the fire-resistant sound-insulating wall 20 must be considered. However, as shown in the example in Figure 5, by forming the entire end face in the long direction of the half Pca panel 21 as an inclined surface, it becomes unnecessary to attach a notching material, and it becomes possible to connect with the fire-resistant sound-insulating wall 20 regardless of its position.

[0034] In Figure 5, the entire end face 28 in the long-side direction of the half-PCA plate 21 is made into an inclined surface. However, the entire end face 28 in the long-side direction may also be formed from a first surface 26 and an inclined surface 27, as shown in Figure 3. Alternatively, only one end face may be made into an inclined surface, as shown in Figure 4.

[0035] As described above, by providing the joint structure of the present invention, gaps that occur in the joint portions of the half-PCA board 21 are eliminated, ensuring sound insulation and fire resistance. Furthermore, since it replaces fire-resistant seals in the joint portions, on-site post-construction work (such as construction requiring scaffolding and filling with sealant in an upward direction) is completely unnecessary, workability and cost-effectiveness can also be improved.

[0036] While the interface structure of the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments described above. It can be modified to include other embodiments, additions, changes, or deletions within the scope that a person skilled in the art can conceive. Any embodiment that achieves the function and effect of the present invention is included within the scope of the present invention. [Explanation of symbols]

[0037] 10, 20... Fire-resistant soundproof wall 11, 21... Half PCA board 12, 23... Concrete 13... Floor 14, 25... Joint part 15…Sealant 22, 22a, 22b, 28...end face 24...Protrusion 26…First side 27…Slope surface

Claims

1. A floor slab composed of multiple half-precast panels and a connection structure between a fire-resistant wall, a soundproof wall, or a fire-resistant soundproof wall, A joint structure in which, after constructing a floor by pouring concrete onto the floor slab, a wall is constructed below the floor slab, wherein the distance between two opposing end faces of two adjacent half-precast slabs in the portion where the fire-resistant wall or sound-insulating wall or fire-sound-insulating wall joins is smaller than the particle size of the coarse aggregate constituting the concrete at the lowest point on the fire-resistant wall or sound-insulating wall or fire-sound-insulating wall side, and increases upward from the fire-resistant wall or sound-insulating wall or fire-sound-insulating wall side, such that at least one of the two opposing end faces is formed at an inclination.

2. The joint structure according to claim 1, wherein at least one end face of the two adjacent half-precast panels in the portion where a construction error is added to the portion where the fire-resistant wall or sound-insulating wall or fire-resistant sound-insulating wall joins is formed at an inclination.

3. A floor slab composed of multiple half-precast panels and a connection structure between a fire-resistant wall, a soundproof wall, or a fire-resistant soundproof wall, A joint structure in which, after concrete is poured onto the floor slab to construct a floor, and then a wall is constructed below the floor slab, the distance between the two opposing end faces of two adjacent half-precast panels at least at the portion where the fire-resistant wall or sound-insulating wall or fire-resistant sound-insulating wall meets increases upward from the fire-resistant wall or sound-insulating wall side, such that the entire end face in the long-side direction of at least one of the two adjacent half-precast panels is inclined.

4. The joint structure according to claim 1 or 3, wherein at least one end face is formed to have a first surface along the thickness direction of the half-precast plate and an inclined surface continuous with the first surface and inclined with respect to the thickness direction.

5. The joint structure according to claim 4, wherein one of the two opposing end faces is formed to have an inclined surface that is inclined with respect to the thickness direction, and the other of the two opposing end faces is a surface parallel to the thickness direction.

Images