Method for reusing deck composite slab and building

Abstract

To allow reuse of deck composite slabs.SOLUTION: Disclosed is a method for reusing a deck composite slab, the method including a first step of removing at least a portion of a deck composite slab formed by integrating a deck plate and concrete from an existing building, a second step of processing the removed deck composite slab, and a third step of connecting the processed deck composite slab to beams of a newly constructed building.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] A technique for fixing a deck plate for a deck composite slab to a steel frame via a plate is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, generally, a deck composite slab is fixed to a steel frame forming a beam by welding. The deck composite slab fixed to the steel frame by such a fixing method is considered difficult to reuse.

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

Means for Solving the Problems

[0006] On one side, a first step of taking out at least a part of a deck composite slab formed by integrating a deck plate and concrete from an existing building, a second step of processing the taken-out deck composite slab, and a third step of coupling the processed deck composite slab to a beam of a newly constructed building are provided, and a method for reusing a deck composite slab is provided.

Effects of the Invention

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

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

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Figure 4

Figure 4A

Figure 5

Figure 5A

Figure 5B

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Figure 7

Figure 7A

Figure 8

Modes 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 and the like in the drawings may be exaggerated partially for the sake of explanation. Also, in the drawings, for ease of viewing, only some of the parts having the same attribute and existing in plurality may be provided with reference signs.

[0010] FIG. 1 is a flowchart showing a schematic flow of a method for reusing a deck composite 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.

[0011] The method for reusing the deck composite slab of this embodiment (hereinafter, also referred to as "this method") first includes a step (S10) of taking out the deck composite slab from the existing building 1. The method of taking out the deck composite 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] FIGS. 2 and 3 show explanatory diagrams of this step (S10). FIG. 2 shows a partial range including the cutting position in the deck composite slab 10 of the existing building 1 in a two - view. FIG. 3 is a plan view schematically showing an example of the range (extraction range) of the deck composite slab to be taken out. In FIGS. 2 and 3 (and also in FIGS. 4 and the like to be described later), a right - hand coordinate system is associated with each figure, and the Z direction corresponds to the vertical direction. Also, in FIG. 2, only in the left - hand figure, the beam 20 of the existing building 1 is shown.

[0013] The deck composite slab 10 to be removed is formed by integrating a deck plate 12 and concrete 11. The deck plate 12 has a plurality of rib portions 121 that project in the negative Z direction (lower side) and extend in the X direction. In this case, a groove portion 122 that is recessed in the positive Z direction is formed between the adjacent rib portions 121 in the Y direction on the deck plate 12. Note that the detailed shape and configuration of the deck composite slab 10 are arbitrary, and may include reinforcing bars or the like integrated with the concrete 11.

[0014] In FIG. 2, a cutting line CT1 is schematically illustrated. In this case, it is cut along the YZ plane passing through the cutting line CT1. In this example, the range on the arrow R2 side from the cutting line CT1 is the range to be reused.

[0015] The range (removal range) of the deck composite slab to be removed from the deck composite slab 10 to be removed is arbitrary, but may correspond to the range to be used in the new building 2. Further, the removal range may be, for example, the inner range surrounded by the beams 20 and 20A of the existing building 1 as shown in FIG. 3. Hereinafter, in order to distinguish the deck composite slab thus removed from the existing building 1 from the deck composite slab 10 of the original existing building 1, it is also referred to as "deck composite slab 7". Note that the deck composite slabs 7 removed from the existing building 1 may be in a plurality of separated forms. Hereinafter, the reuse of one deck composite slab 7 will be described, but the same may apply to other deck composite slabs 7.

[0016] Next, this method includes a step (S11) of processing the deck composite slab 7.

[0017] In FIG. 4, an explanatory diagram of this step (S11) is illustrated. In FIG. 4, a partial range of the deck composite slab 7 is shown in a two-dimensional view.

[0018] This step (S11) includes a plate fixing step of fixing a plate 30 on the side opposite to the side where the concrete 11 is joined in the deck plate 12 of the deck composite slab 7 (negative Z direction).

[0019] The plate 30 may be, for example, made of stainless steel. The plate 30 may be in the form of a flat plate. The plate 30 is fixed to the surface on the negative Z side of the deck plate 12 (the surface on the negative Z side of the rib portion 121) by welding. This is because the concrete 11 exists on the positive Z side of the deck plate 12 and it is substantially impossible to fix it with bolts or the like.

[0020] The size of the plate 30 is arbitrary, but it may be adapted so as to ensure the necessary fixing range between the deck plate 12 and the beam 21 and the fastening points of the bolts BT1 described later.

[0021] The plate thickness of the plate 30 is arbitrary as long as the required strength and synthesis are ensured, but it may be set in relation to the flange of the beam 21 in the new building 2 described later.

[0022] In this embodiment, as shown in FIG. 4, in the Y direction, the plate 30 extends over a plurality of rib portions 121 of the deck plate 12. In this case, in the range of the deck plate 12 covered by the plate 30, a space 70 with the negative Z side closed is formed between the groove portion 122 between adjacent rib portions 121 and the plate 30. In a modified example, as shown in FIG. 4A, the plate 30A is in a separated form in a plurality, and as a whole, in the Y direction, it may extend over a plurality of rib portions 121 of the deck plate 12. In this case, the plurality of plates 30A may be arranged in a manner that does not cover some of the spaces 70, as shown in FIG. 4A.

[0023] The welding range between the plate 30 and the rib portion 121 of the deck plate 12 is arbitrary, but for example, a welding length of 50 mm or more may be ensured in the Y direction and / or the X direction for each rib portion 121.

[0024] This process (S11) may include a process of roughening the cut surface (horizontal end face) of the deck composite slab 7. In this case, when placing the concrete for the newly constructed deck composite slab 10A (described later) arranged adjacent to the deck composite slab 7 in a subsequent process, the concrete and the deck composite slab 7 can be firmly integrated.

[0025] Next, this method includes a process (S12) of connecting the processed deck composite slab 7 to the beams 21 and 22 of the newly constructed building 2.

[0026] Figures 5 to 8 show explanatory diagrams of this process (S12). Figure 5 is a perspective view showing an example of the location where the deck composite slab 7 is arranged in the newly constructed building 2. Figure 5A is a perspective view showing the location in Figure 5 from below. Figure 5B is a plan view schematically showing the portion where the deck composite slab 7 is arranged in the newly constructed building 2. In Figures 5 and 5A, the location where the deck composite slab 7 is arranged in the newly constructed building 2 is indicated by the arrow R5. In Figures 5 and 5A, for the convenience of explaining the location where the deck composite slab 7 is arranged, a newly constructed deck composite slab 10A is shown around the location where the deck composite slab 7 is arranged. However, as described later, the deck composite slab 10A formed adjacent to the deck composite slab 7 is formed after the deck composite slab 7 is arranged. Also, in Figure 5B, the arrangement range of the deck composite slab 7 is hatched for distinction from the newly constructed deck composite slab 10A. Figure 6 is a schematic cross-sectional view along line A-A of Figure 5B, Figure 7 is a cross-sectional view when cut along the YZ plane passing through line C-C of Figure 6, and Figure 8 is a schematic cross-sectional view along line B-B of Figure 5B.

[0027] This process (S12) includes, first, a process of installing (placing) the deck composite slab 7 on the beams 21 and 22 of the new building 2. At this time, the deck composite slab 7 may be installed so as to cover the flanges of the beams 21 and 22 by 50 mm or more in sectional view. In this embodiment, as shown in FIGS. 6 to 8, the deck composite slab 7 is installed on the beams 21 and 22 in a manner where the cutting plane is located at the center of the flanges of the beams 21 and 22. However, the deck composite slab 7 may be installed on the beams 21 and 22 in a manner where the cutting plane is slightly offset from the center of the flanges of the beams 21 and 22.

[0028] This process (S12) further includes a process of coupling the installed deck composite slab 7 to the beams 21 and 22 of the new building 2 via the plate 30.

[0029] In the example shown in FIGS. 6 and 7, the deck composite slab 7 is coupled to the beam 21 via the L-shaped cross-section plate 82 and the plate 30.

[0030] The L-shaped cross-section plate 82 is provided so as to overlap the plate 30 from the negative side in the Z direction. The L-shaped cross-section plate 82 is fastened to the plate 30 by high-strength bolts BT1. Note that the perforation for the bolts BT1 may be realized by drilling after the installation of the deck composite slab 7. Also, the L-shaped cross-section plate 82 is welded to the beam 21. For example, the L-shaped cross-section plate 82 may be welded to the surface on the negative side in the Z direction of the flange of the beam 21 and the web of the beam 21 with respect to the beam 21 in the form of an H-shaped steel.

[0031] Note that in this embodiment, the L-shaped cross-section plate 82 is provided so as to overlap both the flange of the beam 21 and the plate 30 from the negative side in the Z direction. Therefore, the plate thickness of the plate 30 may be the same as the plate thickness of the flange of the beam 21. However, when the plate thickness of the plate 30 and the plate thickness of the flange of the beam 21 are different, level adjustment may be performed using a filler plate.

[0032] As shown in FIG. 7, a plurality of L-shaped cross-section plates 82 may be provided along the Y direction. However, in a modified example, as shown in FIG. 7A, the plate 30B may be arranged in a manner that does not cover some of the spaces 70. In this case, as shown in FIG. 7A, the L-shaped cross-section plate 82 is not arranged with respect to some of the spaces 70.

[0033] Here, in this embodiment, the fastening position by the bolt BT1 between the plate 30 and the L-shaped cross-section plate 82 is set at a location that faces the groove portion 122 of the deck plate 12 in the plate 30 in the Z direction. Thereby, the fastening by the bolt BT1 can be performed using the above-described space 70 formed by the groove portion 122.

[0034] In this way, according to this embodiment, by welding the plate 30 fastened to the L-shaped cross-section plate 82 by the high-strength bolt BT1 to the beam 21, the deck composite slab 7 can be fixed to the beam 21. That is, according to this embodiment, the deck composite slab 7 can be fixed to the beam 21 by fixing the plate 30 welded to the deck composite slab 7 and the beam 21 via the high-strength bolt BT1.

[0035] Here, mainly with reference to FIGS. 6 and 7, the coupling method between the beam 21 and the deck composite slab 7 has been described, but the coupling method between the beam 22 and the deck composite slab 7 may be the same. However, in the example shown in FIG. 8, the beam 22 and the deck composite slab 7 are coupled without passing through the plate 30.

[0036] Subsequently, this method may include a step of completing a newly constructed deck composite slab 10A following this step (S12). FIGS. 5 to 8 schematically show the installation state of the newly constructed deck composite slab 10A. In FIGS. 6 and 8, the concrete for the deck composite slab 10A is shown in the state before placement (see the dashed line). In this case, the newly constructed deck composite slab 10A is supported by beams 21 and 22 using deck receiving angles 80 and 81. The deck receiving angles 80 and 81 may be welded to the beams 21 and 22 and the deck plate 12A of the newly constructed deck composite slab 10A. Further, the newly constructed deck composite slab 10A may be reinforced by reinforcing bars 14, studs BT2, etc. The concrete of the newly constructed deck composite slab 10A is placed so as to be integrated with the side surface (coarse cut surface) of the deck composite slab 7. In this case, the newly constructed deck composite slab 10A and the deck composite slab 7 can be firmly integrated.

[0037] 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 components of the above-described embodiments.

Explanation of Reference Numerals

[0038] 1 Existing building 2 Newly constructed building 6 Deck composite slab (removed from the existing building) 10, 10A Deck composite slab 11 Concrete 12, 12A Deck plate 121 Rib portion 122 Groove portion 14 Reinforcing bar 20, 20A, 21, 22 Beam 30 Plate 70 Space 80, 81 Angle 82 L-shaped cross-section plate

Claims

1. A first step of removing at least a part of a deck composite slab formed by integrating a deck plate and concrete from an existing building; A second step of processing the removed deck composite slab; And a third step of coupling the processed deck composite slab to a beam of a new building. A method for reusing a deck composite slab.

2. The second step includes a plate fixing step of fixing a plate on a side opposite to a side where the plate is coupled to the concrete in the deck plate. The method for reusing a deck composite slab according to Claim 1.

3. The third step includes a bolt fixing step of fixing the plate and the beam via bolts. The method for reusing a deck composite slab according to Claim 2.

4. The deck plate has a plurality of rib portions on the opposite side; The plate fixing step includes welding the plate to at least a part of the plurality of rib portions in the deck plate; The bolt fixing step includes setting a fixing position of the bolt at a location between adjacent rib portions. The method for reusing a deck composite slab according to Claim 3.

5. A deck composite slab formed by integrating a deck plate and concrete; A plate coupled to a side opposite to a side where the plate is coupled to the concrete in the deck composite slab; And a beam coupled to the deck composite slab via the plate. A building.

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