Slab reinforcement structure and construction method of slab reinforcement structure

Abstract

To improve the workability of a slab while reinforcing the slab.SOLUTION: A plurality of foundation beams arranged along an upper surface of a slab foundation 20 are each erected on adjacent foundation columns to define an underfloor space (pit). A slab reinforcement structure comprises the slab foundation 20 as a pressure-resistant plate, a slab 50 provided directly above the slab foundation 20, and support columns 70 erected on the slab foundation 20 to support the slab 50. The slab 50 forms a floor of the floor directly above the slab foundation 20. This slab 50 is made of reinforced concrete.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a slab reinforcement structure and a construction method for the slab reinforcement structure. [Background technology]

[0002] 2. Description of the Related Art A reinforced concrete column is known that includes a spiral steel pipe, concrete filled in the spiral steel pipe, and a reinforcing bar embedded in the concrete (see, for example, Patent Documents 1 and 2).

[0003] Also, a beam column is known that reinforces a slab that supports a demolition heavy machine when a structure is dismantled (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-158116 [Patent Document 2] JP 2004-316294 A [Patent Document 3] JP 2011-196042 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, for example, during the construction of a structure, heavy machinery may run over the constructed slab. In this case, in order to ensure the strength of the slab, it may be possible to increase the thickness of the slab or the amount of slab reinforcement.

[0006] However, increasing the thickness of the slab or the amount of slab reinforcement increases the amount of work required to construct the slab.

[0007] In consideration of the above, an object of the present invention is to improve the workability of a slab while reinforcing the slab. [Means for solving the problem]

[0008] The slab reinforcement structure described in claim 1 comprises a pressure-resistant plate, a slab provided directly above the pressure-resistant plate, and support columns erected on the pressure-resistant plate to support the slab.

[0009] According to the slab reinforcement structure of claim 1, the slab is provided directly above the pressure-resistant plate. Support columns are erected on the pressure-resistant plate. The slab is supported by the support columns.

[0010] This makes it possible to reinforce the slab without increasing the thickness of the slab or the amount of reinforcement in the slab, thereby improving the workability of the slab.

[0011] In addition, by erecting the support columns on the pressure plate, the vertical load of the support columns is transmitted to the ground via the pressure plate. Therefore, reinforcement of the pressure plate is unnecessary or reduced. Therefore, the workability of the pressure plate is improved.

[0012] The slab reinforcement structure according to claim 2 is the slab reinforcement structure according to claim 1, wherein the support column has a cylindrical body erected on the pressure plate, and concrete filled in the cylindrical body.

[0013] According to the slab reinforcement structure of claim 2, the support column has a cylindrical body that stands on the pressure plate, and concrete that is filled in the cylindrical body.

[0014] This allows the support columns to be constructed by filling the cylindrical bodies standing on the pressure plate with concrete, thus improving the ease of construction of the support columns.

[0015] In addition, the cylindrical body functions as a throw-away formwork for the supporting column, so there is no need to remove the cylindrical body after the supporting column is constructed, which further improves the ease of construction of the supporting column.

[0016] Furthermore, by using the support columns as temporary structures to support the slab during construction of the structure, it is possible to eliminate the need for column reinforcement bars to be embedded in concrete, thus further improving the ease of construction of the support columns.

[0017] A slab reinforcement structure according to a third aspect of the present invention is the slab reinforcement structure according to the second aspect, wherein the cylindrical body supports a deck of the slab.

[0018] According to the slab reinforcement structure recited in claim 3, the cylindrical body supports the deck of the slab.

[0019] Here, for example, when constructing a slab, the deck of the slab is supported by a cylindrical body standing on a pressure plate. This allows the concrete to be poured into the cylindrical body and the concrete of the slab to be poured on the deck to be poured together, thus improving the workability of the slab and the support columns.

[0020] The construction method for a slab reinforcement structure described in claim 4 comprises a deck installation step of installing a slab deck on a cylindrical body erected on a pressure plate, and a concrete pouring step of arranging slab reinforcement on the deck and pouring concrete on the deck and into the cylindrical body.

[0021] According to the construction method of a slab reinforcement structure of claim 4, in the deck installation step, a slab deck is installed on a cylindrical body erected on a pressure plate. Next, in the concrete pouring step, slab reinforcement is arranged on the deck, and concrete is poured on the deck and into the cylindrical body. Then, when the concrete hardens, the slab is supported by a support column having a cylindrical body erected on the pressure plate and concrete filled in the cylindrical body.

[0022] This makes it possible to reinforce the slab without increasing the thickness of the slab or the amount of reinforcement in the slab, thereby improving the workability of the slab.

[0023] In addition, in the concrete pouring process, the concrete for the support columns and the slab is poured together, thereby improving the workability of the support columns and the slab.

[0024] Furthermore, by erecting support columns on the pressure plate, the vertical load of the support columns is transmitted to the ground via the pressure plate. Therefore, reinforcement of the pressure plate is unnecessary or reduced. Therefore, the workability of the pressure plate is improved.

[0025] In addition, the cylindrical body functions as a throw-away formwork for the supporting column, so there is no need to remove the cylindrical body after the supporting column is constructed, which further improves the ease of construction of the supporting column.

[0026] Furthermore, by making the support columns temporary, there is no need to embed column reinforcement bars in the concrete, which further improves the ease of construction of the support columns. Effect of the Invention

[0027] As described above, according to the present invention, it is possible to reinforce a slab while improving the workability of the slab. [Brief description of the drawings]

[0028] [Figure 1] 1 is a plan cross-sectional view showing a foundation of a structure to which a slab reinforcement structure according to one embodiment is applied. [Diagram 2] 2 is a cross-sectional view taken along line 2-2 of FIG. 1. [Diagram 3] 3 is a cross-sectional view corresponding to FIG. 2 showing a construction process of a construction method for a slab reinforcement structure according to one embodiment. [Figure 4] 3 is a cross-sectional view corresponding to FIG. 2 showing a construction process of a construction method for a slab reinforcement structure according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, one embodiment will be described with reference to the drawings.

[0030] (structure) 1 shows a foundation 12 of a structure (building) 10 to which the slab reinforcement structure according to this embodiment is applied. The structure 10 has, for example, multiple layers (multiple floors). The foundation 12 of the structure 10 includes a mat foundation 20 as a pressure-resistant plate, multiple foundation columns 30, multiple foundation beams 40, and multiple support columns 70.

[0031] (Slab foundation) 2, the raft foundation 20 is a spread foundation, and is laid on the ground G via basin concrete (not shown). The raft foundation 20 is a slab (foundation slab) made of reinforced concrete, and has multiple slab reinforcements 22 buried inside. Multiple foundation columns 30 are erected on the raft foundation 20.

[0032] (Foundation pillar) As shown in Fig. 1, a plurality of foundation columns 30 are arranged at intervals in two horizontal directions. Each foundation column 30 is, for example, made of reinforced concrete, and has a plurality of column main bars and shear reinforcement bars (not shown) embedded therein. In addition, a foundation beam 40 is erected between adjacent foundation columns 30.

[0033] In addition, the foundation pillar 30 may be made of reinforced concrete, steel-reinforced concrete, or CFT.

[0034] (foundation beam) The multiple foundation beams 40 are arranged along the upper surface of the slab foundation 20. The multiple foundation beams 40 are also erected on adjacent foundation columns 30, respectively, to define an underfloor space (pit) R. Each foundation beam 40 is made of reinforced concrete, and has multiple main column bars and multiple shear reinforcements (not shown) embedded therein. These foundation beams 40 and foundation columns 30 support a slab 50 (see FIG. 2) provided directly above the slab foundation 20.

[0035] In addition, for example, a pedestrian passage or the like may be formed in the foundation beam 40. In addition, the foundation beam 40 is not limited to being made of reinforced concrete, but may be made of steel-reinforced concrete or steel. In addition, the foundation beam 40 may be provided as necessary, and may be omitted as appropriate.

[0036] (Slab) As shown in Fig. 2, a slab 50 forms the floor of the floor immediately above the slab foundation 20. This slab 50 is made of reinforced concrete, and a plurality of slab reinforcements 52 are arranged inside. In addition, as one example, the slab 50 is a composite slab including a deck plate 60 and concrete 54 poured on the deck plate 60. The deck plate 60 is an example of a deck.

[0037] Specifically, the deck plate 60 is, as an example, a reinforced deck plate, and a plurality of truss bars 62 are attached to the upper surface of the deck plate 60 by welding or the like. Also, pouring holes 64, which will be described later, are formed in the deck plate 60. With the slab bars 52 arranged on the deck plate 60, concrete 54 is poured to form the slab 50.

[0038] The truss reinforcement 62 is an example of a slab reinforcement. In this embodiment, the deck of the slab 50 is the deck plate 60. However, the deck of the slab 50 is not limited to the deck plate 60, and may be, for example, a flat deck. In this case, the slab 50 is not a composite slab but an ordinary slab.

[0039] In this embodiment, heavy machinery and the like runs on the constructed slab 50 during construction of the structure 10. For this reason, in this embodiment, the slab 50 is supported (temporarily supported) by a plurality of support columns 70.

[0040] (Support column) 1 and 2, the multiple support columns 70 are provided in the underfloor space (pit) R of the slab 50, and serve as temporary columns (temporary columns) that support the slab 50 during construction of the structure 10. The multiple support columns 70 are also arranged at intervals in two horizontal directions on the slab foundation 20, and support the central side of the slab 50, the outer periphery of which is supported by the four foundation columns 30.

[0041] 2, each support column 70 has a tubular body 80 and concrete 90 filled in the tubular body 80. The tubular body 80 is formed into a cylindrical shape as a whole. The tubular body 80 functions as a stiffening member for the support column 70 and also functions as a throw-away formwork for the concrete 90.

[0042] The cylindrical body 80 has an outer cylindrical member 82 and an inner cylindrical member 84 that are connected in the axial direction. The outer cylindrical member 82 and the inner cylindrical member 84 in this embodiment are formed, for example, by a winding pipe (spiral duct) having a spiral rib on the outer circumferential surface.

[0043] The outer cylindrical member 82 and the inner cylindrical member 84 are not limited to winding pipes, and may be formed of, for example, a normal metal pipe (metal duct) without a spiral rib. The outer cylindrical member 82 and the inner cylindrical member 84 are not limited to a circular cross section, and may be, for example, a rectangular cross section. The outer cylindrical member 82 and the inner cylindrical member 84 are an example of a pair of cylindrical members.

[0044] The outer cylindrical member 82 is erected on the mat foundation 20. The outer peripheral surface of the lower end of this outer cylindrical member 82 is fixed to the mat foundation 20 via a plurality of fixing brackets 72. As an example, the plurality of fixing brackets 72 are formed from L-shaped steel, and are arranged across the outer peripheral surface of the lower end of the outer cylindrical member 82 and the upper surface of the mat foundation 20.

[0045] One end of each fixing bracket 72 is fixed to the lower end of the outer cylindrical member 82 by welding or a screw (not shown), and the other end of each fixing bracket 72 is fixed to the upper surface of the slab foundation 20 by a screw (concrete screw) 74.

[0046] The fixing structure of the outer cylindrical member 82 (cylindrical body 80) to the mat foundation 20 can be changed as appropriate.

[0047] The lower end (one end) of the inner cylindrical member 84 is slidably inserted into the upper end (one end) of the outer cylindrical member 82. The upper end of the outer cylindrical member 82 and the lower end of the inner cylindrical member 84 are fixed together with a screw 86. Note that the upper end of the outer cylindrical member 82 and the lower end of the inner cylindrical member 84 are slidable in the axial direction before being fixed together with the screw 86. This makes it possible to adjust the height (axial length) of the cylindrical body 80.

[0048] The upper end of the inner cylindrical member 84 reaches the lower surface of the deck plate 60 of the slab 50 and supports the deck plate 60. In addition, the deck plate 60 has a casting hole 64 that communicates with the inside of the inner cylindrical member 84 formed therein.

[0049] The casting holes 64 are circular through-holes that penetrate the deck plate 60 in the thickness direction. Concrete 90 is cast into the inner cylindrical member 84 and the outer cylindrical member 82 through the casting holes 64.

[0050] The concrete 90 is poured integrally with the concrete 54 of the slab 50, and the upper end portion is integrated with the concrete 54 of the slab 50. The slab 50 is supported by the support columns 70.

[0051] As described above, the support columns 70 are temporary columns that support the slab 50 during construction of the structure 10, and therefore do not bear earthquake forces. Therefore, the concrete 90 of the support columns 70 is unreinforced.

[0052] It should be noted that the concrete 90 is not limited to being unreinforced, and reinforcing bars such as column main bars and reinforcing bars may be embedded in the concrete 90 as necessary. In addition, in this embodiment, the outer tubular member 82 is disposed below the inner tubular member 84. However, the outer tubular member 82 and the inner tubular member 84 may be interchanged, and the outer tubular member 82 may be disposed above the inner tubular member 84.

[0053] In addition, in this embodiment, after construction of the structure 10, the support columns 70 are not removed but are left in place, but the support columns 70 may be removed as necessary.

[0054] (Construction method for slab reinforcement structure) Next, an example of a construction method for the slab reinforcement structure according to this embodiment will be described.

[0055] (Cylindrical body installation process) 3 shows the constructed slab 20. First, in the cylindrical body installation process, an outer cylindrical member 82 is erected on the upper surface of the constructed slab 20. Then, the lower end of the outer cylindrical member 82 is fixed to the upper surface of the slab 20 by a plurality of fixing brackets 72.

[0056] In the state shown in FIG. 3, the foundation columns 30 and the foundation beams 40 (see FIG. 1) are constructed on the mat foundation 20.

[0057] Next, the lower end side of the inner cylindrical member 84 is inserted into the upper end side of the outer cylindrical member 82. At this time, the inner cylindrical member 84 is slid in the axial direction relative to the outer cylindrical member 82 to adjust the height of the cylindrical body 80. In this state, the upper end side of the outer cylindrical member 82 and the lower end side of the inner cylindrical member 84 are joined with a plurality of screws 86 to form the cylindrical body 80.

[0058] It is also possible to stand the outer cylindrical member 82 and the inner cylindrical member 84, which have been previously joined together with screws 86 or the like, on the mat foundation 20.

[0059] Furthermore, the gap between the upper end side of the outer cylindrical member 82 and the lower end side of the inner cylindrical member 84 is sealed with a sealing material 88 (see FIG. 4) such as masking tape. The gap between the upper end side of the outer cylindrical member 82 and the lower end side of the inner cylindrical member 84 may be sealed with the sealing material 88 before concrete 90 is filled into the cylindrical body 80. Furthermore, the sealing material 88 may be provided as necessary and may be omitted as appropriate.

[0060] (Deck installation process) Next, as shown in Figure 4, in the deck installation process, the deck plate 60 of the slab 50 is installed on the cylindrical body 80 erected on the slab foundation 20, and the deck plate 60 is supported by the cylindrical body 80 and the foundation beams 40 (see Figure 1). At this time, the deck plate 60 is installed so that the casting holes 64 of the deck plate 60 overlap with the cylindrical body 80 in a plan view. In addition, the gap between the casting holes 64 of the deck plate 60 and the upper end of the cylindrical body 80 is sealed with a sealing material 92 such as masking tape.

[0061] In this embodiment, the casting holes 64 are formed in advance in the deck plate 60. However, the casting holes 64 may be formed in the deck plate 60 in accordance with the position of the cylindrical body 80 after the deck plate 60 is installed. Also, without forming the casting holes 64 in the deck plate 60, the cylindrical body 80 may be disposed between the ends of adjacent deck plates 60, making it possible to pour concrete 90 into the cylindrical body 80 from above the deck plate 60.

[0062] Furthermore, the gap between the casting hole 64 of the deck plate 60 and the upper end of the cylindrical body 80 may be sealed with a sealing material 92 before concrete 90 is filled inside the cylindrical body 80. Furthermore, the sealing material 92 may be provided as necessary and may be omitted as appropriate.

[0063] In this embodiment, the deck plate 60 is supported by the cylindrical body 80. However, the deck plate 60 may not be supported by the cylindrical body 80, and may be supported by, for example, the foundation beams 40 or shoring.

[0064] (Concrete pouring process) Next, in the concrete pouring process, the slab reinforcement 52 is arranged on the truss reinforcement 62 of the deck plate 60. In this state, concrete 54, 90 is poured integrally onto the deck plate 60 and into the cylindrical body 80, as shown in Fig. 2. As a result, the slab 50 is formed, and the support columns 70 that support the slab 50 are also formed.

[0065] (action) Next, the operation of this embodiment will be described.

[0066] As described above, in this embodiment, in the deck plate installation process, the deck plate 60 of the slab 50 is installed on the cylindrical body 80 erected on the raft foundation 20. Next, in the concrete pouring process, the slab reinforcement 52 is arranged on the deck plate 60, and concrete 54, 90 is poured on the deck plate 60 and into the cylindrical body 80.

[0067] When the concrete 54, 90 hardens, the slab 50 is supported by the support column 70 having a cylindrical body 80 erected on the raft foundation 20 and concrete 90 filled in the cylindrical body 80.

[0068] This makes it possible to reinforce the slab 50 without increasing the thickness of the slab 50 or the amount of reinforcement of the slab 50. Therefore, the workability of the slab 50 is improved.

[0069] In addition, in the concrete pouring process, the concrete 54, 90 of the slab 50 and the supporting columns 70 are poured integrally, thereby improving the workability of the slab 50 and the supporting columns 70.

[0070] Furthermore, by erecting the support columns 70 on the raft foundation 20, the vertical load of the support columns 70 is transmitted to the ground G via the raft foundation 20. Therefore, reinforcement of the raft foundation 20 is unnecessary or reduced. Therefore, the workability of the raft foundation 20 is also improved.

[0071] In addition, the cylindrical body 80 functions as a throw-away formwork for the support column 70. Therefore, the cylindrical body 80 does not need to be removed after the construction of the support column 70. Therefore, the construction efficiency of the support column 70 is further improved.

[0072] Furthermore, by making the support columns 70 temporary, there is no need for column main reinforcements or the like to be embedded in the concrete 90. Therefore, the workability of the support columns 70 is further improved.

[0073] Moreover, the cylindrical body 80 of the support column 70 has an outer cylindrical member 82 and an inner cylindrical member 84 whose lower end side is slidably inserted into the upper end side of the outer cylindrical member 82. This makes it possible to easily adjust the height (height in the axial direction) of the cylindrical body 80 by sliding the inner cylindrical member 84 in the axial direction relative to the outer cylindrical member 82. This further improves the ease of installation of the support column 70.

[0074] (Modification) Next, a modification of the above embodiment will be described.

[0075] In the above embodiment, the cylindrical body 80 of the support column 70 is formed by two outer cylindrical members 82 and an inner cylindrical member 84. However, the cylindrical body 80 may be formed by, for example, three or more cylindrical members, or may be formed by a single cylindrical member.

[0076] In the above embodiment, the support column 70 is formed by filling the cylindrical body 80 with concrete 90. However, the support column may be formed, for example, by filling a conventional formwork with concrete. The support column 70 is not limited to being made of concrete, and may be made of steel, for example.

[0077] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0078] 20. Mat foundation (pressure-resistant plate) 50 Slab 60 Deck plate (deck) 70 Support pillar 80 Cylindrical body 90 Concrete

Claims

1. A pressure-resistant plate and A slab provided directly above the pressure plate; A support column erected on the pressure plate and supporting the slab; A slab reinforcement structure comprising:

2. The support pillars are A cylindrical body that is erected on the pressure-resistant plate; Concrete filled into the cylindrical body; having The slab reinforcement structure of claim 1.

3. The cylindrical body supports the deck of the slab. The slab reinforcement structure according to claim 2.

4. a deck installation step of installing a slab deck on a cylindrical body erected on a pressure plate; A concrete pouring process of placing slab reinforcement on the deck and pouring concrete on the deck and into the cylindrical body; A construction method for a slab reinforcement structure comprising:

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