JP4323226B2 - Synthetic ribbed slab - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, as a means for constructing a concrete floor slab such as a bridge, a gibber material such as a rib and a reinforcing bar is previously attached on a steel plate to be a floor, and concrete is placed on the floor steel plate in the field. By doing so, the present invention relates to an improvement of a composite slab that integrates steel and concrete.
[0002]
[Prior art]
As this kind of synthetic floor slabs in the past, those of various structures have been proposed, and among them, as a detent material provided on the steel plate to be the floor, a U-shaped rib has a central connection side as an upper surface. For example, Patent Document 1 discloses a structure in which the U-shaped ribs are integrally connected by loop reinforcing bars which are arranged in parallel in the opposite directions and are inserted into the side surfaces of the ribs in a skewered manner. , Patent Document 2, Patent Document 3 and the like.
[0003]
[Patent Document 1]
JP-A-11-192613 (FIGS. 1 to 3)
[Patent Document 2]
Japanese Patent Laid-Open No. 2000-1939 (FIGS. 1 to 6)
[Patent Document 3]
JP 2000-38796 A (FIGS. 1 to 12)
[0004]
[Problems to be Solved by the Invention]
Each of the above synthetic floor slabs has a structure in which U-shaped ribs that are reversed are arranged in parallel, and these U-shaped ribs are connected integrally by loop reinforcing bars that are inserted in a skewered manner on the sides of the ribs. Because it is a feature, when joining each composite floor slab continuously, the length of the loop reinforcing bar protruding from one composite floor slab is projected outward from the edge of the steel floor slab. If it is made large, the overlapping area between the protruding loop reinforcing bar and the adjacent loop reinforcing bar on the steel slab becomes large, and there is an advantage that the strength at the joint portion of the composite slab can be improved.
[0005]
However, in these synthetic floor slab structures, the side surfaces of the U-shaped ribs arranged in parallel are integrally connected by loop reinforcing bars that are penetrated in a direction perpendicular to the length direction of the ribs. In addition, each loop reinforcing bar is arranged at a position equal to or lower than the side surface of the U-shaped rib on the floor steel plate, and exerts an anti-slipping action on the concrete in a portion below the same height as the side surface of the U-shaped rib. However, at the part higher than the side surface of the U-shaped rib, there is no means for preventing the displacement of the concrete, so that the effective displacement preventing action cannot be exhibited, and a concrete floor slab having an appropriate plate thickness cannot be synthesized. is doing.
[0006]
[Means for Solving the Problems]
The present invention effectively utilizes the rigidity of the trough ribs (traffl ribs) arranged on the floor steel plate as a means for solving the above-mentioned problems of the conventional slab using U-shaped ribs. However, by providing an anti-slipping means formed integrally with the hook-shaped rib above the upper surface of the hook-shaped rib, the anti-slipping action is appropriate at a portion higher than the upper surface of the hook-shaped rib. The object of the present invention is to provide a synthetic ribbed slab that can provide a concrete slab of an appropriate slab thickness that can effectively exert a composite action.
[0007]
As a specific means for the synthetic rib floor slab according to the present invention, on the floor steel plate, a plurality of bowl-shaped ribs are arranged in parallel with the central connection side as the top surface, In the synthetic ribbed slab where both sides are welded to the floor steel plate, a gibber insertion hole is opened on the upper surface of the rib in addition to the concrete introduction hole, and the lower end is a cross-section in the bowl-shaped rib. The main part of the floor slab is inserted in a longitudinal direction so as to cross the wall and has a length such that the upper end protrudes from the upper surface of the rib. It is supported and fixed to the reinforcing bar.
[0008]
The gibber provided on the upper surface of the bowl-shaped rib is preferably a shape having a U-shaped upper end portion and a pair of rod-like lower end portions by bending the central portion of the metal rod into a U shape. .
[0009]
Alternatively, a plurality of hook-shaped ribs may be arranged along the bridge axis direction, and these hook-shaped ribs may be used as a composite floor slab bridge that can function as a main girder.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the synthetic rib floor slab according to the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing the structure of the synthetic rib floor slab. The shaped ribs 2 are arranged in parallel with an interval with the central connection side as the upper surface 3, and the edges of the side edges 4 of the bowl-shaped rib 2 are fixed to the floor steel plate 1 by welding.
[0011]
In one embodiment of the present invention, the floor steel plate 1 has, for example, a length equal to the length of the bridge to be installed, and a plurality of bowl-shaped ribs 2 are provided on the floor steel plate 1. Are arranged in parallel at predetermined intervals along the bridge axis direction. As another example, the floor steel plate 1 has the same size as that used for a general-purpose composite floor slab, and the hook-shaped ribs 2 are arranged in a direction perpendicular to the bridge axis direction, so that the general-purpose composite It may be used as a kind of floor slab.
[0012]
Further, the bowl-shaped rib 2 is provided with concrete introduction holes 5 on the upper surface 3 for introducing concrete into the bowl-shaped rib 2 at intervals, and separately from these concrete introduction holes 5, The dowel insertion hole 6 is provided, and the dowel 7 protrudes on the rib upper surface 3 through the dowel introduction hole 6.
[0013]
The gibber 7 has a U-shaped upper end 7a and a pair of rod-like lower ends 7b by bending the central part of the metal bar into a U-shape. The U-shaped upper end 7 a is provided so as to protrude from the upper surface of the bowl-shaped rib 2 by being inserted vertically into the shaped rib 2 up to a depth reaching the floor steel plate 1.
[0014]
When the composite floor slab is transported to the site and supported on the abutment 10 as shown in FIG. 4, each of the above-mentioned gibels 7 is inserted into the dowel insertion hole 6 of the hook-shaped rib 2. At that time, as shown in FIG. 3, the lower floor slab main rebar 8b and the upper floor slab main rebar 8a are arranged on the upper surface 3 of the saddle rib 2 in a direction orthogonal to the saddle rib 2. A lower floor slab distributing reinforcing bar 9b and an upper floor slab distributing reinforcing bar 9a are arranged in a direction parallel to the shaped rib 2, and each reinforcing bar is provided on the surface of the floor steel plate 1 via a support means (not shown). It is supported and fixed at the height position.
[0015]
Each of the reinforcing bars arranged in this way has a lower floor slab main reinforcing bar 8b and a lower floor slab distributing reinforcing bar 9b, and an upper floor slab main reinforcing bar 8a and an upper floor slab distributing reinforcing bar 9a. The upper floor slab main rebar 8a and the lower floor slab main rebar are fixed and bound by a wire, and the dowel upper end 7a protruding on the upper surface 3 of the saddle rib 2 is arranged in a direction orthogonal to the saddle rib 2. Bundled and supported by a wire 8b .
[0016]
After the reinforcing bars 8 a, 8 b, 9 a, 9 b are arranged on the saddle-shaped rib 2, concrete 11 is placed on the floor steel plate 1. At this time, the concrete introduction hole 5 on the upper surface 3 of the saddle-shaped rib 2 is placed. The concrete 11 is also filled into the bowl-shaped ribs 2 through, and the lower end portion 7b of the diver is firmly fixed in the bowl-shaped rib 2 by the concrete 11, and the concrete 11 by the upper end portion 7a of the gibber is formed on the upper portion of the bowl-shaped rib 2. So that the anti-slipping action can be properly exerted.
[0017]
【The invention's effect】
In the synthetic rib floor slab of the present invention, the upper surface of the bowl-shaped rib has a sufficient length such that the lower end penetrates vertically so as to cross the cross section of the bowl-shaped rib, and the upper end projects from the upper surface of the rib. Since the dowel is fixed in the saddle rib by the concrete filled in the saddle rib, the upper part of the saddle rib is secured. Can be provided with a gibber material that exerts a strong anti-slipping action, and as a result, the connection between the ridge-shaped rib and the floor slab concrete is strengthened, and the portion higher than the upper surface of the ridge-shaped rib is connected to the concrete. It is possible to set a concrete slab with an appropriate plate thickness that can effectively exhibit the composite action.
[0018]
In addition, concrete is filled into the hook-shaped ribs through the introduction holes on the upper surface, but the side walls of the hook-shaped ribs are not provided with holes that allow the filled concrete to flow out. By being constrained within the inverted trapezoidal trapezoidal rib closed cross section, the concrete in the tensile region that is not usually considered in the design contributes, and the surplus proof stress is remarkably increased compared with the case where the concrete is simply poured onto the floor slab. Can do.
[0019]
As a result, the vertical ribs improve the strength of the floor steel plate, so that the main girders and the floor slab are integrated by using the vertical ribs as the main girders, in addition to the use as a kind of ordinary synthetic floor slab. As shown in FIG. 4, this composite floor slab is installed on the main girder as a bridge member for a relatively short bridge having a bridge length of about 10 to 25 m. Instead, it is supported directly between the abutments, and the rib-shaped rib can maintain the function as the main girder, and a composite floor slab bridge in which the bridge can be built only by the composite rib floor plate can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial perspective view showing a structure of a synthetic rib floor slab according to the present invention.
FIG. 2 is a perspective view illustrating a detailed structure of a hook-shaped rib portion.
FIG. 3 is a partial cross-sectional view showing a configuration of hook-shaped ribs and reinforcing bars.
FIG. 4 is a side view of a state in which the synthetic ribbed slab of the present invention is installed.
[Explanation of symbols]
1: floor steel plate,
2: bowl-shaped ribs,
3: The upper surface of the rib,
4: Both sides,
5: Concrete introduction hole,
6: Giber insertion hole,
7: Giver,
7a: U-shaped upper end,
7b: lower end,
8a: Lower floor slab main rebar,
8b: Upper floor slab main rebar,
9a: Lower floor slab distributing reinforcing bars,
9b: Upper floor slab distributing reinforcing bars,
10: Abutment,
11: Concrete,

Claims (2)

In the synthetic ribbed slab, on the floor steel plate, a plurality of saddle ribs are arranged in parallel with the central connection side as the top surface, and both sides of the saddle rib are welded to the floor steel plate, respectively. In addition to the concrete introduction hole, a dowel insertion hole is opened on the top surface of the bowl-shaped rib, and the lower end of the dowel insertion hole is vertically penetrated so as to cross the cross section of the bowl-shaped rib. A gibber having a height that protrudes from the upper surface of the hook-shaped rib is inserted, and the upper end of the gibel is supported and fixed to the floor slab rebar arranged on the upper surface of the hook-shaped rib. Synthetic ribbed slab.   The synthetic rib floor slab according to claim 1, wherein the gibel has a U-shaped upper end and a pair of bar-shaped lower ends by bending the central part of the metal bar into a U-shape.

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