JP3658550B2 - Deck plate and concrete slab - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a deck plate and a concrete slab for constructing a concrete slab.
[0002]
[Prior art]
In concrete slabs, weight reduction and reduction of weight impact sound are required, and a structure in which a hollow tube or a foamed synthetic resin body is embedded in cast concrete has been proposed as a structure for that purpose.
By the way, in the construction method that arranges reinforcing bars on site, it is possible to select the strength and interval of the main reinforcing bars in consideration of the size of the hollow pipe or the foamed synthetic resin body, and it is The hollow ratio obtained by an empty tube or the like can be selected relatively freely.
[0003]
However, in a deck plate in which trusses are fixed on a substrate in a factory, the space between the trusses is predetermined. Therefore, it is required to improve the hollow ratio under the restriction of a predetermined truss interval.
And in order to hold | maintain the intensity | strength of concrete slab, it is preferable that the concrete thickness of the upper part of a hollow part obtained by a hollow tube etc. and the downward direction is substantially equivalent.
[0004]
Conventionally, the invention of Japanese Patent Application Laid-Open No. 2000-120203 has been proposed as a proposal for increasing the hollow ratio in a deck plate in which the distance between trusses serving as main reinforcing bars is fixed.
In the present invention, a lightweight member such as a hollow tube is arranged in a solid truss joined with main bars, distribution bars and lattice bars. There is no consideration for increasing it.
In addition, for the maintenance of the position of the hollow tube, etc., it has been proposed to use each truss bar as a fulcrum, but if the lower force distribution bar is used as a fulcrum, the hollow pipe etc. is located at the lower part of the concrete, If the upper reinforcement bar is used as a fulcrum, it will be located in the upper part of the concrete and will be biased either upward or downward, and cannot be positioned in the vertical center. Furthermore, if the lattice muscle of the truss is used as a fulcrum so as to be positioned at the center in the vertical direction, it cannot be positioned at the center between the trusses.
[0005]
[Problems to be solved by the invention]
This invention makes it possible to maximize the limited cross-sectional area existing between trusses in a factory-produced deck plate with trusses whose truss spacing is determined in advance, and to create hollow parts (parts where no concrete exists). The first problem is to obtain as large as possible.
The second problem is to position the buried member at the center of the concrete thickness, and the third problem is to position it at the center between the trusses.
[0006]
[Means for Solving the Problems]
In the first aspect of the present invention, a plurality of suspending bars bent in an inverted V shape in the vertical direction at predetermined intervals are arranged on the substrate at a plurality of equal intervals, and the upper end of the truss is fixed to the lower side of the top of the suspending bars, The bottom plate of the truss is positioned above the substrate at a predetermined interval, and the deck plate is configured by arranging a buried member having a flat cross section in the central portion between the adjacent trusses and the substantially central portion of the concrete thickness. Is. The specific arrangement of the embedded member having a flat cross-sectional shape is that the distance from the center of the embedded member to the suspension bar at the position of the embedded member is the upper power distribution between the center and the upper end of the truss If the distance is longer than the distance to the line, the cross-sectional shape of the embedded member is horizontally long (Claim 2), and the distance from the center of the embedded member to the suspension bar at the position where the embedded member is disposed is from the center to the truss. When the distance is shorter than the distance to the upper power distribution bar arranged between the upper end bars, the cross-sectional shape of the buried member is arranged as being vertically long (Claim 3). Examples of the flat cross-sectional shape include an elliptical cross-sectional shape, a rectangular shape, and other flat polygonal shapes, as shown in the embodiments, a central portion having a straight edge, and both side portions having arc edges. The material may be a metal tube, or a foamed synthetic resin such as expanded polystyrene or expanded polystyrene.
[0007]
As a specific configuration for regulating the position of the embedded member, an embedded member is arranged between an upper reinforcing bar disposed between upper truss bars of the truss and a lower reinforcing bar disposed between lower bar bars of the truss. The upper and lower holding members are arranged between the trusses, and the holding members are fixed to the upper or lower bar of the truss. In addition, there is one that holds the embedded member between the upper and lower holding members to hold the upper and lower positions (Claim 4). Further, if the upper holding member is provided with a bent portion having a convex arc shape and the lower holding member is provided with a bent portion having a concave arc shape, the lateral position of the embedded member is also reliably held (Claim 5). The upper holding member may be locked to the lower end of the truss, and the lower holding member may be locked to the upper end of the truss. A seventh aspect of the invention is a concrete slab formed by placing concrete on the deck plate according to any one of the first to sixth aspects.
[0008]
[Action]
In this invention, since the embedded member has a flat cross-sectional shape, even in a deck plate in which the truss interval is specified and the cross-sectional area that can be utilized to obtain a hollow portion by the hanging bar is extremely limited, Is obtained. And since the embedded member is used in order to obtain a hollow part, it is lightweight and workability | operativity is good.
In the inventions according to claims 4 to 6, an increase in the buoyancy of the buried member at the time of placing concrete is suppressed by the distribution bar or the holding member, and the vertical position is regulated. Therefore, the buried member is positioned at the upper and lower central portions of the concrete thickness. In the invention of claim 6, since the embedded member is sandwiched between the bent portions of the upper and lower holding members, the lateral movement is also prevented and the lateral position is also restricted.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the figure, a plurality of suspension bars 3 having rising portions 2 bent in an inverted V shape at predetermined intervals are arranged in parallel on the upper surface of a substrate 1 made of an iron plate or stainless steel plate. The upper end muscle 5 of the truss 7 formed by fixing the upper end muscle 5 and the lower end muscle 6 to the upper and lower sides of the lattice muscle 4 is fixed to the lower side of the top of the rising portion 2 of the hanging muscle 3. The lower end stripes 6 are located above the substrate 1 at a predetermined interval, and the lower end stripes are arranged without using spacers.
[0010]
An upper force distribution bar 8 is disposed between the upper end bars 5 of the truss 7, a lower force distribution line 9 is disposed between the lower end lines 6, and an embedded member 10 is disposed between the upper and lower force distribution bars. It is.
[0011]
In the embodiment of FIGS. 1 and 2, the upper and lower positions of the embedded member 10 are regulated by the upper holding member 11 and the lower holding member 14.
The upper holding member 11 has a reinforcing bar bent in a convex arc shape corresponding to the peripheral shape of the upper portion of the embedded member, the convex arc-shaped portion is brought into contact with the upper surface of the embedded member 10, and the locking portions 12 provided at both ends are provided on the truss. The lower end muscle 5 is locked and fixed. Further, the lower holding member 14 has a reinforcing bar bent in a concave arc shape corresponding to the peripheral shape of the lower portion of the embedded member, the concave arc-shaped portion is brought into contact with the lower surface of the embedded member 10, and the locking portions provided at both ends are at the upper end. It is locked to the muscle and fixed.
[0012]
In this embodiment, after the lower holding member 14 is attached between the trusses, the hollow member 10 is disposed thereon, and then the upper holding member 11 is attached.
Here, the lower holding member 14 has a configuration in which a concave arc-shaped portion is continuously provided and one lower holding member is provided across a plurality of trusses, or one lower holding member is provided between adjacent trusses. Any of the configurations described above can be used. On the other hand, the upper holding member 11 is provided with one upper holding member between adjacent trusses.
[0013]
According to this embodiment, since the vertical position of the embedded member 10 is restricted by the upper and lower holding members 11, 14, the embedded member is not lifted during concrete placement, and the vertical position of the embedded member is restricted. The Further, since the upper and lower holding members 11 and 14 are bent in an arc shape and are in contact with the upper surface and the lower surface of the embedded member, the embedded member does not move in the lateral direction and the lateral position of the embedded member is also restricted.
Therefore, the embedded member 10 is always located at the position as designed, and the construction reliability is improved.
[0014]
By the way, when the embedded member is disposed, the embedded member is required to be positioned at the center of the concrete slab thickness, but the lateral position may not be strictly regulated. In such a case, it is possible to make the upper and lower holding members straight without providing bent portions.
In the above-described embodiment, the upper holding member 11 is fixed to the lower end stripe 6 and the lower holding member is fixed to the upper end stripe 5. However, the fixing positions of the upper and lower holding members are the distance between the truss, the height of the truss and the size of the embedded member. Can be selected as appropriate in consideration of the relative relationship. The holding member is not limited to a reinforcing bar, and a plastic molded product can be used, and the lower holding member can be a flexible wire, a plastic string, or the like.
[0015]
In the embodiment shown in FIG. 2, the distance L <b> 2 between the two strength bars is longer than the distance L <b> 1 between the rising portions 2 of the suspension bars at the intermediate position between the upper strength muscle 8 and the lower strength muscle 9. Therefore, the embedded member 10 has a vertically long flat shape.
Specific shapes and sizes of the embedded member 10 are as follows.
The cross-sectional shape is a track type for athletics, and has a straight edge 101 at the center and semicircular edges 102 on both sides. The length of the straight edge 101 is changed to adjust the left and right dimensions. Therefore, the hollow ratio can be changed, and a large hollow ratio can be obtained without hindering the concrete strength as much as possible.
In the figure, reference numeral 13 is concrete.
[0016]
In the above embodiment,
L1 = 140mm
L2 = 188mm
Truss pitch (P) = 200mm
Concrete thickness (D) = 300mm
Length of straight edge (a) = 40mm
Semicircular edge diameter (b) = 120 mm
The average plate thickness is 219.5 mm and the hollowness is 26.83%. This hollow ratio is comparable to the numerical value when the truss pitch is 300 mm and a lightweight member having a diameter of 175 mm is embedded, the average plate thickness is 219.8 mm, and the hollow ratio is 26.73%.
Since L1 = 140 mm and L2 = 188 mm in the condition settings of the above embodiment, a perfect circle with a diameter of 175 mm cannot be embedded, and when using a perfect circle, such a high hollow ratio cannot be obtained. .
[0017]
In the embodiment shown in FIG. 3, a distance L1 between the rising portions 2 of the suspension bars at an intermediate position between the upper strength bar 8 and the lower strength bar 9 is longer than the distance L2 between the both strength bars. Therefore, the embedded member 10 has a horizontally long flat shape.
Specific shapes and sizes of the embedded member 10 are as follows.
The cross-sectional shape is a track type for athletics, and has a straight edge 101 at the center and semicircular edges 102 on both sides, so that a large hollow ratio can be obtained without hindering concrete strength as much as possible. It is like that.
The vertical dimension is slightly smaller (several millimeters to 10 mm) than the distance L2 between the upper and lower force distribution bars 8 and 9, so that insertion between the force distribution lines is easy. The left and right dimensions are smaller than the distance L1 between the rising portions 2 of the suspension bars.
In this embodiment, the vertical position of the embedded member is regulated by the upper and lower distribution bars, and the upper and lower holding members are not used.
The lower part of the embedded member is held by the distribution bar 9 and the upper part of the embedded member is held by the upper holding member. Conversely, the lower part of the embedded member is held by the lower holding member and the upper part is held by the distribution bar 8. Such a structure is also possible.
[0018]
In the above embodiment,
L1 = 140mm
L2 = 118mm
Truss pitch (P) = 200mm
Concrete thickness (D) = 225mm
Length of straight edge (a) = 30mm
Semicircular edge diameter (b) = 110 mm
The average plate thickness is 161.0 mm and the hollowness is 28.44%. This hollowness is a numerical value when a round lightening member having a diameter of 125 mm is embedded with a truss pitch of 225 mm, an average plate thickness of 170.4 mm, and a hollowness of 24.27%.
Since L2 = 118 mm in the condition setting of the above embodiment, a perfect circle having a diameter of 125 mm cannot be embedded, and such a high hollow ratio cannot be obtained when a perfect circle is used.
[0019]
In the embodiment shown in FIG. 4, the distance L <b> 2 between the upper strength bar 8 and the lower strength bar 9 is longer than the distance L <b> 1 between the rising portions 2 of the suspension bars at the middle position of the good strength muscle. Therefore, the embedded member 10 has a vertically long flat shape.
[0020]
In the above embodiment,
L1 = 140mm
L2 = 168mm
Truss pitch (P) = 200mm
Concrete thickness (D) = 275mm
Length of straight edge (a) = 40mm
Semicircular edge diameter (b) = 120 mm
The average plate thickness is 194.5 mm and the hollowness is 29.27%. This hollowness is equivalent to the value when a round member with a truss pitch of 275 mm and a diameter of 175 mm is embedded, the average thickness is 187.5 mm, and the hollowness is 31.81%. When the thickness is embedded, the average plate thickness is 210.7 mm, and the hollowness exceeds 23.38%.
Since L1 = 140 mm and L2 = 168 mm in the condition settings of the above embodiment, a perfect circle with a diameter of 175 mm or a diameter of 150 mm cannot be embedded, and such a high hollow ratio is obtained when a perfect circle is used. It is not possible.
[0021]
【The invention's effect】
According to this invention, since the embedded member has a flat shape, the embedded member having a large cross-sectional area can be used without changing the truss interval. Therefore, it is possible to obtain a hollow portion having as large a cross-sectional area as possible within the predetermined truss spacing and the upper and lower spacing bars without causing a reduction in strength due to the truss spacing change.
Since the embedded member has a flat cross-section, the vertical dimension can be made to correspond to the distance between the upper and lower force distribution bars with the same cross-sectional area by appropriately changing the flatness ratio. Therefore, the vertical position of the buried member can be regulated by the distribution bar, and can be automatically positioned at the center of the concrete thickness.
Further, if the embedded member is held by the holding member, the embedded position can be regulated while the vertical dimension of the embedded member is freely determined.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of the present invention.
FIG. 2 is a front view of an embodiment in which an embedded member is held by a holding member.
FIG. 3 is a front view of an embodiment in which the embedded member is a horizontally long flat body.
FIG. 4 is a front view of an embodiment in which the embedded member is a vertically long flat body.
FIG. 5 is an explanatory diagram showing dimension codes.
[Explanation of symbols]
1 Substrate 2 Rising part Suspension bar 4 Lattice bar 5 Upper bar 6 Lower bar 7 Truss 8 Upper bar 9 Lower bar 10 Embedded member 11 Upper holding member 13 Concrete 14 Lower holding member

Claims (7)

A plurality of suspending bars bent in a reverse V shape in the vertical direction at predetermined intervals are arranged on the substrate at equal intervals, the upper end of the truss is fixed to the lower side of the top of the suspending bar , and the lower end of the truss is attached to the substrate. A deck plate that is located at a predetermined interval above and has an embedded member having a flat cross section at the center between the adjacent trusses and substantially at the center of the concrete thickness.  The distance from the center of the embedded member to the hanger bar at the position where the embedded member is disposed is longer than the distance from the center to the upper force distribution bar disposed between the upper end bars of the truss, and the cross-sectional shape of the embedded member is horizontally long. The deck plate according to claim 1.  The distance from the center of the embedded member to the suspension bar at the position where the embedded member is disposed is shorter than the distance from the center to the upper force distribution bar disposed between the upper end bars of the truss, and the cross-sectional shape of the embedded member is vertically long The deck plate according to claim 1.  An upper holding member and a lower holding member of the embedded member are disposed at right angles to the upper and lower bars of the truss, and the embedded member is disposed between the upper holding member and the lower holding member. The deck plate according to any one of claims 1 to 3, wherein the vertical position of the embedded member is held by the upper and lower holding members.  The deck plate according to claim 4, wherein the upper holding member has a convex arc-shaped bent portion, and the lower holding member has a concave arc-shaped bent portion. The deck plate according to claim 5, wherein an end of the upper holding member is locked to a lower bar of the truss and an end of the lower holding member is locked to an upper bar of the truss.  In the arrangement | positioning position of the concrete slab embedding member formed by placing concrete in the deck plate in any one of Claim 1 thru | or 6.

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