Method for reusing floor slab, and architectural structure

Abstract

To reuse a floor slab.SOLUTION: There is disclosed a method for reusing floor slabs that includes: a first process of taking floor slab pieces as parts of floor slabs from floor slabs of an existing architectural structure; and a second process of connecting or engaging the taken-out floor slab pieces to or with a footing beam for a newly constructed architectural structure. The second process preferably includes fixing a floor slab piece to a side part of the footing beam with bolts.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a method for reusing a floor slab and a building.

Background Art

[0002] A construction method of removing the floor slab of an existing structure and performing renovation is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the floor slab is relatively heavy, it is generally disassembled and removed. However, if the floor slab can be reused, it is effective from the viewpoint of SDGs (Sustainable Development Goals) and the like.

[0005] Therefore, an object of the present disclosure is to enable the reuse of a floor slab.

Means for Solving the Problems

[0006] On one side, a first step of taking out a floor slab piece, which is a part of the floor slab, from the floor slab of an existing building, and a second step of coupling or engaging the floor slab piece to a foundation beam for a newly constructed building are included, and a method for reusing a floor slab is disclosed.

Effects of the Invention

[0007] According to the present disclosure, the reuse of a floor slab becomes possible.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0009] Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limited thereto, and the shapes, etc. in the drawings may be exaggerated partially for the convenience of explanation. Also, in the drawings, for ease of viewing, only some of the parts having the same attribute existing in plurality may be provided with reference numerals.

[0010] FIG. 1 is a flowchart showing a schematic flow of a method for reusing a floor slab according to this embodiment. FIGS. 2 to 6 are explanatory diagrams of each step of the reuse method shown in FIG. 1, and are schematic diagrams schematically showing the execution method of the corresponding step and the state at the time of completion of the step, etc.

[0011] The method for reusing the floor slab of this embodiment (hereinafter, also referred to as "this method") first includes a step (S30) of taking out the floor slab from the existing building 1. The method of taking out the floor slab from the existing building 1 is arbitrary, and for example, it may be a method of cutting it out by cutting or the like. Note that a concrete cutter or the like may be used for cutting.

[0012] Fig. 2 shows an explanatory diagram of this step (S30). In Fig. 2, an example of the extraction ranges Q21 and Q22 in the floor slab 40 of the existing building 1 is schematically shown in a side view. In Fig. 2 (the same applies to Fig. 3 and other figures to be described later), a right-handed coordinate system is associated with each figure, and the Z direction corresponds to the vertical direction.

[0013] In the example shown in Fig. 2, a part of the floor slabs 40 of the first and second floors is extracted. Note that the extraction range is arbitrary.

[0014] Next, this method includes a step (S31) of processing a part of the extracted floor slab 40. The processing is arbitrary, and may include, for example, processing for adjusting the size, etc., or a step of separating into a plurality of divided bodies. If the processing is not required, this step may be omitted. Hereinafter, in order to distinguish a part of the extracted floor slab 40 (after processing if processing is performed in S31) from the floor slab 40 of the existing building 1, it is also referred to as a "floor slab piece 41". Note that concrete fragments and the like generated during the processing may be used as crushed stones within the site of the new building 2.

[0015] In this embodiment, the floor slab piece 41 thus extracted is reused in a manner of forming a counterweight portion of the new building 2 as described below.

[0016] Next, this method includes a step (S32) of arranging the floor slab piece 41 on the side of the foundation beam 24B of the new building 2.

[0017] Figs. 3 and 4 show explanatory diagrams of this step (S32). In Fig. 3, an example of the floor slab piece 41 to be arranged is schematically shown in a plan view together with the foundation beam 24B of the new building 2. Also, in Fig. 3, the columns 55 installed in the new building 2 are schematically shown together. In Fig. 4, a state where the floor slab piece 41 is arranged on the side of the foundation beam 24B of the new building 2 is schematically shown in a side view.

[0018] The floor slab piece 41 may be arranged over the entire side of the foundation beam 24B or may be arranged over a part thereof. The floor slab piece 41 may be arranged in a direction such that the surface which was a horizontal plane in the existing building 1 becomes a vertical plane in the newly constructed building 2.

[0019] In the example shown in FIG. 3, the floor slab piece 41A is arranged on the outer side surface of a specific portion of the foundation beam 24B. In this case, the specific portion is in the vicinity of the column 55. The floor slab pieces 41A are arranged in pairs on both sides in the Y direction of the newly constructed building 2.

[0020] Also, in the example shown in FIG. 3, the floor slab piece 41B is arranged on the inner side surface of a specific portion of the foundation beam 24B. In this case, the specific portion is away from the column 55.

[0021] Also, in the example shown in FIG. 3, the floor slab piece 41C is arranged on the outer side surface and the inner side surface of a specific portion of the foundation beam 24B, respectively. In this case, the specific portion is the corner where the foundation beams 24B intersect each other.

[0022] Thus, the floor slab piece 41 may be appropriately arranged at any position of the foundation beam 24B. Examples of preferable arrangement positions of the floor slab piece 41 (preferable arrangement positions in relation to the brace 58) will be described later.

[0023] Note that the floor slab piece 41 may be arranged in a manner in close contact with the side surface of the foundation beam 24B, or may be arranged opposite to the side surface of the foundation beam in a manner in which other members or materials are interposed therebetween. For example, crack-arresting reinforcing bars may be arranged between the floor slab piece 41 and the foundation beam 24B. Alternatively, instead of or in addition to the joining step (S33) described later, a material (for example, an adhesive or grout) for joining the floor slab piece 41 and the foundation beam 24B may be arranged or filled therebetween.

[0024] Also, the Z-direction dimension of the floor slab piece 41 may be substantially the same as that of the foundation beam 24B. In this case, the floor slab piece 41 is arranged in a manner that covers the entire vertical direction of the side surface of the foundation beam 24B. However, in a modified example, the floor slab piece 41 may be smaller or larger than the vertical dimension of the side surface of the foundation beam 24B. In the example shown in FIG. 5, the floor slab piece 41 is arranged so as to protrude slightly above the upper surface of the foundation beam 24B (see dimension H in FIG. 5). In this case, the upper part 419 of the floor slab piece 41 can function as a weir during the subsequent concrete placement.

[0025] Next, this method includes a coupling step (S33) of coupling the arranged floor slab piece 41 to the foundation beam 24B.

[0026] In FIG. 5, as an explanatory diagram of this step (S33), the state after this step is shown as a cross-sectional view along line D-D in FIG. 3. In the example shown in FIG. 5, the floor slab piece 41 and the foundation beam 24B are fixed by fastening bolts BT5 that penetrate both of them in the horizontal direction. In order to allow such bolts BT5 to penetrate, bolt through-holes may be formed in the foundation beam 24B by core drilling, or bolt through-holes may be formed by a sleeve method or a similar method. Also, bolt through-holes may be formed in the floor slab piece 41 by core drilling. The number and position of the bolts BT5 are arbitrary, but may be adapted so that the floor slab piece 41 can appropriately transmit gravity to the foundation beam 24B via the bolts BT5 (coupling parts) as a counterweight part (described later).

[0027] Here, the floor slab piece 41 can preferably function as a counterweight portion that reduces or prevents the uplift of the foundation beam 24B when a horizontal force or the like is generated. Specifically, as schematically shown in FIG. 6, when the foundation beam 24B receives the upward force F from the column, the force F can be reduced or canceled by the gravity of the floor slab piece 41. The function as such a counterweight portion is particularly effective at locations where the uplift of the foundation beam 24B is likely to occur (i.e., locations where the force F is large), for example, at locations where the brace 58 is arranged. This is because when the brace 58 receives a horizontal force due to the sway of the new building 2 or the like at the location where the brace 58 is arranged, an upward force acts on the foundation beam 24B via the brace 58. In the example shown in FIG. 3, since the floor slab piece 41A is arranged near the column 55 where the brace 58 is provided, the uplift of the foundation beam 24B that may occur due to the force received via the brace 58 can be effectively reduced or prevented.

[0028] Note that a preferable position of the floor slab piece 41 in relation to such a brace 58 may be such that a part of the floor slab piece 41 (for example, a portion near the center of gravity of the floor slab piece 41) is located within the plane in which the brace 58 extends, or within a plane that is offset parallel to the said plane by a relatively short distance.

[0029] In this embodiment, the floor slab piece 41 and the foundation beam 24B are connected by bolts BT5, but the connection method may be other methods. For example, an adhesive may be used. Also, in this embodiment, the floor slab piece 41 and the foundation beam 24B are connected by bolts BT5, but instead of or in addition to this, the floor slab piece 41 and the foundation beam 24B may be engaged in such a manner that the gravity of the floor slab piece 41 can be transmitted to the foundation beam 24B. Such an engagement method is arbitrary. For example, horizontal unevenness may be provided, and the floor slab piece 41 and the foundation beam 24B may be engaged in such a manner that a convex portion of one of the floor slab piece 41 and the foundation beam 24B fits into a concave portion of the other. Alternatively, an angle (L-shaped steel) may be fixed to the foundation beam 24B, and the floor slab piece 41 may be supported by the angle. In this case, the gravity of the floor slab piece 41 can be transmitted to the foundation beam 24B via the angle (engagement portion).

[0030] FIG. 7 is an explanatory view of another coupling method between the floor slab piece 41 and the foundation beam 24B. In the example shown in FIG. 7, the floor slab pieces 41 (see, for example, the floor slab piece 41C in FIG. 3) are coupled to the outer side surface and the inner side surface of the foundation beam 24B by bolts BT6. In this case, the bolts BT6 may be provided in a manner that simultaneously penetrates both of the floor slab pieces 41 arranged on the outer side surface and the inner side surface of the foundation beam 24B. Note that, similar to the bolt BT5 described above, the bolt BT6 extends in the horizontal direction to fasten both of them (the floor slab piece 41 and the foundation beam 24B). In FIG. 7, reference numeral 45 indicates a newly constructed floor slab. The foundation beam 24C may be a foundation beam of the existing building 1. In this case, the foundation beam 24C of the existing building 1 and the floor slab 40 of the existing building 1 can be combined and reused.

[0031] As described above in detail for each embodiment, the present invention is not limited to a specific embodiment, and various modifications and changes are possible within the scope described in the claims. Also, it is possible to combine all or a plurality of the constituent elements of the above-described embodiments.

Description of Reference Numerals

[0032] 1 Existing building 2 New building 24B Foundation beam 40 Floor slab 41, 41A, 41B, 41C Floor slab pieces 55 Column 58 Brace

Claims

1. A first step of taking out a floor slab piece, which is a part of the floor slab, from the floor slab of an existing building; A method for reusing a floor slab, comprising a second step of coupling or engaging the floor slab piece to a foundation beam for a new building.

2. The method for reusing a floor slab according to Claim 1, wherein the second step includes fixing the floor slab piece to a side portion of the foundation beam with bolts.

3. The method for reusing a floor slab according to Claim 1, wherein the second step includes coupling or engaging the floor slab piece to the foundation beam on which a column to which a brace is coupled is disposed.

4. The method for reusing a floor slab according to any one of Claims 1 to 3, wherein the second step includes coupling or engaging the floor slab piece to the foundation beam in a manner such that the weight of the floor slab piece is transmitted to the foundation beam through a coupling portion or an engaging portion.

5. A building having a foundation beam and a floor slab piece that is a part of the floor slab of an existing building and is taken out from the existing building, wherein the floor slab piece is coupled or engaged to the foundation beam and functions as a counterweight portion for reducing or preventing the foundation beam from lifting.

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