Half PC slab and PC slab

Abstract

To provide a half PC slab plate that can reduce the number of work steps at a construction site. [Solution] The concrete plate (20) has a concrete pouring surface (20a) formed on the upper surface thereof, a PC member (40) extending in a predetermined direction of the concrete plate (20), with its middle portion embedded inside the concrete plate (20) and both ends exposed from the concrete pouring surface (20a) of the concrete plate (20), and holding members (50) provided on both ends of the concrete plate (20) in the direction in which the PC member (40) extends, and which hold both ends of the PC member (40) while applying a tensile force to the PC member (40).

Description

[Technical Field]

[0001] The present invention relates to a half PC slab plate and a PC slab used in the half PC slab construction method. [Background technology]

[0002] In buildings, PC slabs are formed using the half PC slab method in order to increase the distance between the beams that support the slab and reduce the amount of reinforcement used to construct the slab.

[0003] A known conventional half PC slab construction method involves placing multiple half PC slab plates between beams, supporting each half PC slab plate from below with support members such as pipe supports, placing PC steel wires on the upper side of the half PC slab plates, pouring concrete on the upper side of the half PC slab plates, and after the poured concrete has hardened, applying tension to the PC steel wires and removing the support members (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 59-177445 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the conventional half PC slab construction method, concrete must be poured onto the top surface of the half PC slab plate at the construction site, and then tension must be applied to the PC steel wires after the poured concrete has hardened. This increases the amount of work required at the construction site, making it difficult to reduce construction costs.

[0006] An object of the present invention is to provide a half PC slab plate and a PC slab that can reduce the number of work steps at a construction site. [Means for solving the problem]

[0007] The half PC slab plate of the present invention comprises a concrete plate having a concrete pouring surface formed on its upper surface, a PC member extending in a predetermined direction of the concrete plate, with its middle portion embedded inside the concrete plate and both ends exposed from the concrete pouring surface of the concrete plate, and retaining members provided on both ends of the concrete plate in the direction in which the PC member extends, and which hold both ends of the PC member while applying a tensile force to the PC member.

[0008] Furthermore, it is preferable that the half PC slab plate of the present invention is such that the PC member consists of a rod-shaped member having a male thread portion formed on the outer peripheral surface at both ends, and each of the ends is held by the retaining member by screwing a nut onto the male thread portion, and the tensile force can be adjusted by changing the axial position of the nut on the male thread portion.

[0009] In addition, in the half PC slab plate according to the present invention, it is preferable that the retaining member is embedded in the concrete plate.

[0010] Furthermore, it is preferable that the half PC slab plate of the present invention is provided with truss reinforcement, the upper side of which is exposed from the concrete pouring surface of the concrete plate and which supports from below the slab reinforcement placed inside the concrete poured on the concrete pouring surface, the truss reinforcement being arranged along the extension direction of the PC member, and the PC member being arranged in the space formed between a pair of bottom reinforcement and top reinforcement that constitute the truss reinforcement.

[0011] Furthermore, it is preferable that the half PC slab plate of the present invention has a portion of the PC member embedded in the concrete plate that has a straight portion extending linearly in the middle and curved portions that curve upward toward both ends at both ends.

[0012] In addition, it is preferable that the half PC slab plate according to the present invention is formed from concrete having a volume corresponding to the upward force acting due to the tensile force applied to the PC member.

[0013] Furthermore, in the PC slab according to the present invention, a layer of concrete is formed on the concrete pouring surface side of the concrete plate of the half PC slab plate. [Effects of the Invention]

[0014] According to the present invention, when the PC member is installed between the beams of a building, a compressive force acts in the longitudinal direction of the concrete plate due to the tensioned PC member, so there is no need to apply tension to the PC member at the construction site, which makes it possible to reduce the amount of work required on site. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a side cross-sectional view of a half PC slab plate according to one embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of a half PC slab according to one embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 according to one embodiment of the present invention. [Figure 4] FIG. 4 is a cross-sectional view taken along the line BB of FIG. 2 according to one embodiment of the present invention. [Figure 5] FIG. 5 is a plan view of the main parts of the PC member and the holding member according to one embodiment of the present invention. [Figure 6] FIG. 6 is a side cross-sectional view of the main parts of the PC member and the holding member according to one embodiment of the present invention. [Figure 7] FIG. 7 is a front cross-sectional view of the main parts of the truss reinforcement, the PC member, and the holding member according to one embodiment of the present invention. [Figure 8] FIG. 8 is a side cross-sectional view illustrating a method for installing a half PC slab board according to one embodiment of the present invention. [Figure 9]FIG. 9 is a side cross-sectional view illustrating a method for installing a half PC slab board according to one embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view of a PC slab according to one embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view of a PC slab according to another embodiment of the present invention. [Figure 12] FIG. 12 is a cross-sectional view of a PC slab according to another embodiment of the present invention. [Figure 13] FIG. 13 is a cross-sectional view of a PC slab according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Figures 1 to 10 show one embodiment of the present invention. Figure 1 is a side cross-sectional view of a half PC slab plate, Figure 2 is a plan view of the half PC slab plate, Figure 3 is a cross-sectional view taken along line AA in Figure 2, Figure 4 is a cross-sectional view taken along line BB in Figure 2, Figure 5 is a plan view of the main parts of the PC members and retaining members, Figure 6 is a side cross-sectional view of the main parts of the PC members and retaining members, Figure 7 is a front cross-sectional view of the main parts of the truss reinforcement, PC members, and retaining members, Figures 8 and 9 are side cross-sectional views explaining how to install the half PC slab plate, and Figure 10 is a cross-sectional view of the PC slab.

[0017] The half PC slab panel of this embodiment is a component that constitutes a PC slab that divides the interior space of a building, such as a multi-story house, in the vertical direction. The PC slab of this embodiment is formed by placing the half PC slab panel between the beams of the building and pouring concrete on the top side of the half PC slab panel.

[0018] As shown in Figures 1 and 10, the half PC slab plate 10 comprises a concrete plate 20, a plurality of truss reinforcements 30 for supporting from below the slab reinforcement 102 placed inside the concrete 101 poured on the upper side of the concrete plate 20, a plurality of PC members 40 for applying a compressive force horizontally to the concrete plate 20 and a lifting force to lift the middle part of the concrete plate 20 upward, a retaining member 50 for maintaining the state of the PC members 40 that apply the compressive force and lifting force to the concrete plate 20, and a plurality of voids 60 for forming a space between the upper surface of the concrete plate 20 and the poured concrete 101.

[0019] 3 and 4, the concrete plate 20 is a plate-like member having a rectangular shape in plan view as shown in Fig. 2, with a wire mesh 21 disposed inside. The wire mesh 21 is a mesh-like member formed by assembling and welding a plurality of steel wires in a lattice shape, and by disposing it inside the concrete plate 20, it prevents the concrete plate 20 from cracking.

[0020] The concrete slab 20 is formed by placing the wire mesh 21 in a formwork, fixing the truss reinforcement 30 and the retaining members 50 to the wire mesh 21 with fixing members such as binding wires and wires, pouring concrete into the formwork, and allowing the concrete to harden. At this time, the concrete slab 20 is formed with a volume of concrete corresponding to the lifting force acting due to the tensile force of the PC members 40.

[0021] As shown in Figures 3, 4, and 10, a concrete pouring surface 20a is formed on the upper surface of the concrete slab 20, onto which concrete 101 is poured at the construction site. As shown in Figures 2, 3, and 4, rising portions 20a1 are provided on the concrete pouring surface 20a along the extension direction of the truss reinforcement 30, and voids 60 are provided between adjacent rising portions 20a1. In this case, since voids 60 are provided between the rising portions 20a1, it is possible to use voids 60 with a large thickness, which enables the weight of the PC slab 100 to be reduced.

[0022] 3 and 4, the truss reinforcement 30 has a pair of linearly extending bottom reinforcements 31 in the width direction, top reinforcements 32 extending linearly above and between the pair of bottom reinforcements 31, and lattice reinforcements 33 connecting each of the pair of bottom reinforcements 31 to the top reinforcement 32. The truss reinforcement 30 has a space between the pair of bottom reinforcements 31 and the top reinforcement 32 that extends in the longitudinal direction and whose width decreases from the lower side to the upper side.

[0023] The multiple truss reinforcements 30 are arranged so as to extend along the longitudinal direction of the concrete slab 20, and are also arranged at intervals in the lateral direction of the concrete slab 20.

[0024] The truss reinforcement 30 is fixed to the wire mesh 21 by fixing members, and is formed integrally with the concrete slab 20 when the concrete slab 20 is formed. The upper side of the truss reinforcement 30 is exposed from the concrete pouring surface 20a of the concrete slab 20.

[0025] As shown in FIGS. 5 and 6, the PC member 40 is a steel rod-shaped member having male threads 40a formed on the outer circumferential surfaces at both ends, and a nut 41 can be screwed onto the male threads 40a.

[0026] As shown in Fig. 2, the multiple PC members 40 are arranged to extend along the longitudinal direction of the concrete plate 20, and are also spaced apart in the lateral direction of the concrete plate 20. As shown in Figs. 3 and 4, the multiple PC members 40 are each arranged in the space between a pair of bottom reinforcement 31 and top reinforcement 32 of a truss reinforcement 30 formed integrally with the concrete plate 20.

[0027] The PC members 40 each have their middle portion fixed to the wire mesh 21 by a fixing member, and are formed integrally with the concrete slab 20 when the concrete slab 20 is formed.

[0028] The PC members 40 each have a middle portion embedded inside the concrete slab 20 and both ends exposed from the concrete pouring surface 20 a of the concrete slab 20 .

[0029] The portion of the PC member 40 that is embedded in the concrete plate 20 has a straight portion 40b in the center that extends linearly along the wire mesh 21 for a predetermined length, and curved portions 40c that extend upward from both ends of the straight portion 40b.

[0030] The portion of the PC member 40 exposed from the concrete plate 20 is suspended from the top reinforcement 32 of the truss reinforcement 30 by a fixing member.

[0031] The nut 41 threaded onto the male threaded portion 40a of the PC member 40 is positioned outside the retaining member 50 in the longitudinal direction of the concrete plate 20, with both end sides of the PC member 40 engaged with the retaining member 50, and by moving the nut 41 toward the middle side of the PC member 40, it is possible to apply a tensile force to the PC member 40.

[0032] By adjusting the position of the nut 41 on the male thread portion 40a, the PC member 40 is placed in a state where no tensile force is applied until the concrete that makes up the concrete plate 20 hardens, and after the concrete hardens and the concrete plate 20 is formed, the position of the nut 41 is adjusted to apply tensile force.

[0033] The multiple holding members 50 are each arranged at a position corresponding to the PC member 40 in the short direction of the concrete plate 20 and at a position corresponding to both ends of the PC member 40 in the long direction of the concrete plate 20.

[0034] As shown in Figures 5 to 7, the retaining member 50 consists of a pair of retaining plates 51, each formed into an L-shaped cross section by bending a steel plate, and fixed to the concrete plate 20 with portions of each plate overlapping.

[0035] A fixing hole 51a is provided on the lower side of each of the pair of holding plates 51, through which a fixing member is passed when fixing the pair of holding plates 51 to the wire mesh 21. In addition, a connecting hole 51b is provided on the upper side of each of the pair of holding plates 51, through which a fixing member is passed when connecting the pair of holding plates 51 to each other.

[0036] The pair of retaining plates 51 are connected to each other by fixing members at their upper sides and fixed to the wire mesh 21 by fixing members at their lower sides, and are formed integrally with the concrete plate 20 when the concrete plate 20 is formed.

[0037] The upper sides of the pair of retaining plates 51 are exposed from the concrete pouring surface 20a of the concrete slab 20. Furthermore, an insertion hole 51c is provided on the upper side of each of the pair of retaining plates 51, through which the end side of the PC member 40 passes when a portion of each of the retaining plates 51 overlaps, as shown in Figures 5 and 6. The PC member 40 is inserted into each of the insertion holes 51c of the pair of retaining plates 51, and a nut 41 is threaded onto the male thread portion 40a from the outside of the concrete slab 20 in the longitudinal direction.

[0038] Each of the plurality of voids 60 is made of a foam plastic member such as polystyrene foam and has a rectangular parallelepiped shape. The plurality of voids 60 are arranged at intervals in the longitudinal direction of the concrete slab 20 between adjacent truss reinforcements 30 on the upper surface side of the concrete slab 20.

[0039] The half PC slab plate 10 constructed as described above is subjected to a compressive force in the longitudinal direction of the concrete plate 20 by the PC member 40 to which a tensile force is applied, and an upward lifting force is applied to the longitudinal center of the concrete plate 20.

[0040] When forming a PC slab 100 for a building using a half PC slab plate 10, first, as shown in Figure 8, the half PC slab plate 10 is placed between opposing beams 200 of the building using a lifting device such as a crane.

[0041] Next, as shown in Figure 9, the half PC slab plate 10 is supported from below by a support device S such as a pipe support, and slab reinforcement 102 is placed on the upper surface of the half PC slab plate 10. The slab reinforcement 102 is supported by the truss reinforcement 30.

[0042] Finally, as shown in FIG. 10, concrete 101 is poured onto the concrete pouring surface 20a of the concrete slab 20, thereby forming a layer of concrete 101 on the concrete pouring surface 20a side of the concrete slab 20.

[0043] The PC slab 100 is formed from a half PC slab plate 10, slab reinforcement 102, and concrete 101 poured on site.

[0044] Thus, the half PC slab plate 10 of this embodiment comprises a concrete plate 20 having a concrete pouring surface 20a formed on the upper surface side, a PC member 40 extending in a predetermined direction of the concrete plate 20, with its middle portion embedded inside the concrete plate 20 and both end sides exposed from the concrete pouring surface 20a of the concrete plate 20, and retaining members 50 provided on both end sides of the concrete plate 20 in the direction in which the PC member 40 extends, and which hold both end sides of the PC member 40 while applying a tensile force to the PC member 40.

[0045] As a result, when the concrete plate 20 is installed between the beams of the building, the tensioned PC member 40 applies a compressive force in the longitudinal direction to the concrete plate 20, eliminating the need to apply tension to the PC member at the construction site and making it possible to reduce the amount of work required on site.

[0046] Furthermore, it is preferable that the PC member 40 is made of a rod-shaped member having male threaded portions 40a formed on the outer peripheral surface at both ends, and that each of the ends is held by the holding member 50 by screwing nuts 41 onto the male threaded portions 40a, and that the tensile force can be adjusted by changing the axial position of the nuts 41 on the male threaded portions 40a.

[0047] This allows the tensile force of the PC member 40 to be adjusted by operating the nut 41 that is threaded onto the male thread portion 40a, thereby improving the work efficiency of the work of adjusting the tensile force of the PC member 40.

[0048] Furthermore, it is preferable that the retaining member 50 is embedded in the concrete slab 20 .

[0049] This makes it possible to fix the retaining member 50 when forming the concrete slab 20, eliminating the need to separately install the retaining member 50 on the concrete slab 20, thereby enabling manufacturing costs to be reduced.

[0050] Furthermore, it is preferable that the concrete slab 20 is provided with truss reinforcement 30, the upper end of which is exposed from the concrete pouring surface 20a side and which supports from below slab reinforcement 102 placed inside concrete 101 poured on the concrete pouring surface 20a, and that the truss reinforcement 30 is arranged along the extension direction of the PC member 40, and that the PC member 40 is arranged in the space formed between a pair of bottom reinforcement 31 and top reinforcement 32 that constitute the truss reinforcement 30.

[0051] This makes it possible to fix the PC member 40 to the concrete plate 20 without requiring a dedicated component for fixing the PC member 40 to the concrete plate 20, thereby preventing an increase in the number of parts and reducing manufacturing costs.

[0052] Furthermore, it is preferable that the portion of the PC member 40 that is embedded in the concrete plate 20 has a straight portion 40b that extends linearly at the middle side and curved portions 40c that curve upward toward both ends at both ends.

[0053] This makes it possible to reliably apply a force that lifts the central portion of the concrete slab 20 upward in the longitudinal direction, and makes it possible to effectively utilize the tensile force of the PC member 40.

[0054] Furthermore, it is preferable that the concrete slab 20 is formed from concrete with a volume corresponding to the upward force acting due to the tensile force applied to the PC member.

[0055] This balances the force of gravity bending the concrete plate 20 in the downward direction and the upward force applied to the concrete plate 20 by the PC member 40, making it possible to prevent cracking or damage to the concrete plate 20 when the half PC slab plate 10 is transported.

[0056] Furthermore, according to the PC slab 100 of this embodiment, a layer of concrete 101 is formed on the concrete pouring surface 20a side of the concrete plate 20 of the half PC slab plate 10.

[0057] This causes an upward force to act on the longitudinal center of the concrete plate 20, making it possible to suppress deflection of the concrete plate 20 due to its own weight, and making it possible to make the entire PC slab lighter and thinner.

[0058] In the above embodiment, as shown in Figures 3, 4 and 10, rising portions 20a1 are provided on the concrete pouring surface 20a of the concrete slab 20 along the extension direction of the truss reinforcement 30, and voids 60 are installed between adjacent rising portions 20a1, but this is not limited to this.

[0059] As shown in FIG. 11, a rising portion 20a1 may be provided on the concrete pouring surface 20a of the concrete slab 20 along the extension direction of the truss reinforcement 30, and a layer of concrete 101 may be formed without providing a void.

[0060] Furthermore, as shown in FIG. 12, a void 60 may be provided between adjacent truss reinforcements 30 on the concrete pouring surface 20a of the concrete slab 20 without forming any rising portion.

[0061] Furthermore, as shown in FIG. 13, a layer of concrete 101 may be formed on the concrete pouring surface 20a of the concrete slab 20 without forming any rising portions or providing any voids.

[0062] Regardless of which concrete plate 20 is used in Figures 10 to 13, by forming it with concrete of a volume that corresponds to the upward force acting due to the tensile force applied to the PC member 40, it is possible to balance the force of gravity acting to bend the concrete plate 20 in a downward direction and the upward force applied to the concrete plate 20 by the PC member 40.

[0063] Furthermore, in the above embodiment, a steel rod-shaped member was shown as the PC member 40, but as long as it is possible to apply a compressive force and an upward lifting force to the concrete plate 20, the PC member may also be, for example, a twisted wire made by twisting together multiple steel wires. [Explanation of symbols]

[0064] 10 Half PC slab 20 Concrete slab 20a Concrete pouring surface 30 Truss 31 Bottom muscles 32 Top Muscle 40 PC components 40a male thread 40b Straight section 40c curved section 41 Nut 50 holding member 100 pcs slab 101 Concrete 102 Slab Reinforcement

Claims

1. a concrete plate having a concrete pouring surface formed on its upper surface; a PC member extending in a predetermined direction of the concrete plate, with a middle portion embedded inside the concrete plate and both ends exposed from the concrete pouring surface of the concrete plate; and a holding member provided on both ends of the concrete plate in the extending direction of the PC member, the holding member holding both ends of the PC member while applying a tensile force to the PC member. Half PC slab board.

2. The PC member is It consists of a rod-shaped member with male threads formed on the outer circumferential surfaces of both ends, By screwing nuts onto the male threaded portions, both ends are held by the holding members, The tension can be adjusted by changing the axial position of the nut on the male thread portion. The half PC slab plate according to claim 1.

3. The retaining member is embedded in the concrete plate. The half PC slab plate according to claim 1.

4. The upper side of the concrete slab is exposed from the concrete pouring surface, and a truss reinforcement is provided to support from below the slab reinforcement placed inside the concrete poured on the concrete pouring surface, The truss reinforcement is arranged along the extending direction of the PC member, The PC member is placed in the space formed between a pair of bottom reinforcement and top reinforcement that constitute the truss reinforcement. The half PC slab plate according to claim 1.

5. The portion of the PC member embedded in the concrete plate has a straight portion extending linearly at the middle portion side and curved portions curved upward toward both ends at both end sides. The half PC slab plate according to claim 1.

6. The concrete plate is formed of concrete with a volume corresponding to the upward force acting due to the tensile force applied to the PC member. The half PC slab plate according to claim 1.

7. A concrete layer is formed on the concrete pouring surface side of the concrete plate of the half PC slab plate according to any one of claims 1 to 6. PC slab.

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