JP3949514B2 - Vertical joint mechanism in concrete slab placement - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical joint mechanism used when placing concrete in bridges, roads, floor slab forms of buildings, and the like.
[0002]
[Prior art]
A bridge slab is formed by placing reinforcing bars vertically and horizontally, surrounding them with a wooden frame plate called a floor slab formwork, and placing concrete there. Ideally, this concrete placement should be completed once over the entire length of the bridge. However, since there is a limit to the construction performance as a practical problem, concrete joining is performed by placing several times in the length direction of the bridge. A joint mechanism is installed to divide the joint area of this concrete every time in the length direction of the bridge. That is, new concrete is placed in a space partitioned by the concrete tip formed by the previous placement and the newly installed joint mechanism.
[0003]
Since this joint mechanism is repeatedly installed and removed as the concrete is repeatedly placed, how to do this in a short time is an important point for shortening the working time. The present applicant uses a tube (Japanese Patent Application No. 8-111240) or an extendable weir plate as a joint mechanism that can be easily and quickly installed and removed. (Japanese Patent Application No. 10-21495) has already been applied for a patent.
[0004]
[Problems to be solved by the invention]
The joint mechanism relating to the above-mentioned prior application of the present applicant has improved the ease and quickness of installation / removal compared to the conventional one, but it is still not sufficient. Accordingly, an object of the present invention is to provide a joint mechanism that further improves the ease and speed of installation and removal.
[0005]
[Problems to be solved by the invention]
The vertical joint mechanism in the concrete floor slab placement according to the present invention that solves the above-described problems of the prior art includes a first reinforcing bar group that is extended in the length direction while maintaining an appropriate interval in the width direction and the height direction. When placing concrete inside a concrete floor slab form that surrounds the second reinforcing bar group extending in the width direction while maintaining an appropriate interval in the length direction and the height direction, It is formed to divide the placement target area in the length direction of the floor slab formwork.
[0006]
And this vertical joint mechanism is separated in the extending direction of the floor slab formwork between the beam member extended in the width direction of the floor slab formwork, and the beam member and the bottom of the floor slab formwork, A plurality of weir plates that are substantially upright and are fixed with a degree of freedom of rotation in a horizontal plane and that have elastic deformation members formed at both left and right ends. Furthermore, each weir plate has a width that allows the adjacent members to be brought into close contact with each other while the first reinforcing bar group is interposed by compression of the elastic deformation member in a state where the adjacent members are rotated so as to be parallel to the beam member. Thus, it is configured to improve the ease and speed of installation and removal.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to a preferred embodiment of the present invention, the floor slab form is a floor slab form for a bridge, and the beam member has one end locked to at least one of the first and second reinforcing bar groups. The L-shaped L-shaped member and the push-up mechanism that pushes the other end of the L-shaped member upward with the surface of the beam member as a fulcrum, thereby further improving the ease and speed of installation and removal. It is configured as follows.
[0008]
According to a further preferred embodiment of the present invention, the bottom of the floor slab form and the protrusion that enters the bottom plate are formed at the center in the width direction of the barrier plate, thereby facilitating the fixing and rotation of the barrier plate. In addition, it is configured to withstand the pressure of the concrete before solidification placed therewith.
[0009]
【Example】
FIG. 1 is a cross-sectional view showing the structure of a vertical seam mechanism of a bridge floor slab form according to an embodiment of the present invention, together with the floor slab form of a bridge, and FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. It is.
[0010]
A plurality of distribution reinforcing bars 1 are extended as a first reinforcing bar group in the length direction of the bridge while maintaining an appropriate interval in the width direction and the height direction of the bridge. A plurality of main reinforcing bars 2 are extended as a second reinforcing bar group in the width direction of the bridge while maintaining an appropriate interval in the length direction and height direction of the bridge so as to be substantially orthogonal to the distribution reinforcing bar 1. A floor slab form made up of a bottom plate 3 and left and right side plates (not shown) is formed so as to surround the bottom portion of the space where the distribution reinforcing bar group and the main reinforcing bar group are installed and the left and right side portions in the width direction.
[0011]
Concrete is placed in the floor slab form of the bridge several times. At this time, in order to divide the space to be placed in the length direction of the floor slab formwork, the vertical joint mechanism of this embodiment is installed. This vertical joint mechanism is removed and moved in the length direction of the bridge when the concrete is solidified after the previous concrete placement, and is installed at a new position. The next concrete placement is performed in a space delimited by the tip portion of the concrete layer previously placed and the newly installed vertical joint mechanism. When the cast concrete layer that moves the vertical joint mechanism is solidified, even if the vertical joint mechanism is removed, the cast concrete layer is not so soft that the tip of the cast concrete collapses. It is not so hard that a boundary is formed between them.
[0012]
The vertical seam mechanism of this embodiment is fixed with a beam member 4 extended in the width direction of the floor slab formwork and between the beam member 4 and the floor surface 3 of the floor slab formwork with a degree of freedom of rotation. A plurality of barrier plates 5 and an L-shaped clamp 6 that fixes the beam member 4 between the distribution reinforcing bar 1 and the barrier plate 5.
[0013]
The plurality of dam plates 5 are spaced apart from each other in the extending direction of the beam member 4, and thus in the width direction of the bridge. Each weir plate 5 is made of a central portion 5a made of a relatively large rigid material such as wood or plastic, and a relatively soft elastic body such as sponge or soft rubber formed on both right and left ends of the central portion. And the elastic deformation portion 5b. In a state where the barrier plates 5 are rotated so as to be parallel to the beam member 4, the adjacent ones are brought into close contact with each other while the distribution reinforcing bars 1 are interposed by the compression of the elastic deformation portion 5 b. The width is somewhat overlapping.
[0014]
The L-shaped member 6a of the L-shaped clamp 6 is formed of a substantially L-shaped metal fitting, and an end portion on the base side is locked to the uppermost distribution reinforcing bar 1 by a notch formed therein. The push-up mechanism 6b of the L-shaped clamp 6 lifts the beam member 4 with the other end of the L-shaped member 6a with the surface of the beam member 4 as a fulcrum, thereby It is a mechanism for fixing between the dam plate 5.
[0015]
That is, the push-up mechanism 6b includes a bolt b that is screwed to the other end of the L-shaped member 6a and a beam that is fixed to the tip of the bolt b as shown by the push-up mechanism 6b at the right end in FIG. The swivel button s is pressed by the member 4 and the handle h is attached to the root portion of the bolt b. The handle h is rotated, the bolt b is pushed downward, and the surface of the beam member 4 is pressed downward via the swivel button s. As a result, the tip end portion of the L-shaped member 6 a is pushed up with the surface of the beam member 4 as a fulcrum, and the beam member 4 is firmly fixed between the L-shaped clamp 6 locked to the distribution bar 1 and the barrier plate 5. Fixed.
[0016]
As shown in detail in an enlarged view of the front view (A) and the bottom view (B) of FIG. 3, the dam plate 5 has a central portion 5a made of a relatively hard material such as wood, plastic, or metal, It is composed of elastic portions 5b at the left and right ends, a bolt 5c planted at the center of the upper end portion of the central portion 5a, and a sharp projection 5d planted at the center of the bottom portion of the central portion 5a. As shown in FIG. 2, the bolt 5 c planted at the upper end of the barrier plate 5 passes through the through hole formed in the beam member 5 and is then screwed into the nut so that the horizontal plane with respect to the beam member 5 is obtained. It can be installed while maintaining the degree of freedom of rotation inside.
[0017]
When the vertical joint mechanism is installed, as shown in FIG. 4, the beam members 4 and the weirs are kept in a state in which the respective weir plates 5 attached to the beam members 4 are rotated by about 45 ° with respect to the beam members 4. A structure composed of plates 5 is arranged at a desired position between adjacent main reinforcing bars 2. Subsequently, by hitting the top of the dam plate 5 with a hammer, the protrusion 5d planted on the bottom surface of the central portion of the dam plate 5 is caused to enter the bottom plate of the floor slab formwork. Next, the L-shaped member 6a is attached, the telescopic mechanism 6b is operated, and the beam member 4 is fixed.
[0018]
Finally, as shown in FIG. 5, the installation of the vertical joint mechanism is completed by rotating the weir plate 5 in the horizontal plane so as to be parallel to the beam member 4. The completed state of the vertical joint mechanism is shown in the cross-sectional views of FIGS. By placing the concrete while applying vibration to the tip portion solidified by the previous placement and its boundary portion, a continuous concrete layer is formed in which discontinuous portions are not formed at the joints. In FIG. 1, the thin hatched portion indicates the concrete layer that has been cast.
[0019]
When the placed concrete is solidified, this vertical joint mechanism is removed. The vertical seam mechanism is removed by first removing the L-shaped clamp 6 and subsequently pulling the beam member 4 and the dam plate 5 straight upward while maintaining a parallel state.
[0020]
The configuration using the L-shaped clamp 6 has been exemplified above. However, since a considerable degree of fixing function is achieved by piercing the bottom plate of the floor slab form with the projection 5d planted on the bottom surface of the dam plate 5, both ends of the beam member 4 are connected to the floor slab form. The use of the L-shaped clamp 6 can also be omitted by fixing it to the side surface. Conversely, when the L-shaped clamp 6 is used, the protrusion 5d can be omitted.
[0021]
The vertical joint mechanism of the present invention has been described above by taking as an example the case where concrete is placed in a bridge slab formwork. However, the vertical joint mechanism of the present invention is not limited to a bridge, and can also be applied to the case where concrete is placed in a floor slab form for creating a floor surface inside a road or a building.
[0022]
【The invention's effect】
As described above in detail, the vertical joint mechanism according to the present invention is a beam member that extends in the width direction of the floor slab formwork, and the beam member between the beam member and the bottom face of the floor slab formwork. A plurality of barrier plates that are substantially upright and fixed with a degree of freedom of rotation in a horizontal plane and that have elastic deformation members formed on both left and right ends, and each barrier plate is adjacent to each other Easily and easily installed and removed because it has a width that allows them to be in close contact with each other while interposing the reinforcing bars by compression of the elastic deformation member in a state where they are rotated parallel to the beam member There is an effect that Sato improves.
[0023]
In particular, there are places where there are considerable errors in the arrangement of reinforcing bars by forming elastic deformation members at the left and right ends of the dam plate, and places where the thickness has doubled by adding reinforcing bars side by side. However, there is an advantage that a gel-tight structure can be formed on the gel-like concrete immediately after placement by deformation of the elastic deformation member.
[0024]
According to a preferred embodiment of the present invention, an L-shaped L-shaped member having one end at which the beam member is locked to a distribution reinforcing bar group, the other end of the L-shaped member, and the surface of the beam member. Since it is composed of an expansion / contraction mechanism that changes the distance between the two, there is an advantage that it is easy and quick to install and remove.
[0025]
According to still another preferred embodiment of the present invention, by forming a protrusion on the bottom surface of each dam plate, there is an advantage that a large pressure resistance can be realized against the pressing force of the gel-like concrete immediately after placing. is there.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a joint mechanism of a bridge floor slab form according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG.
FIGS. 3A and 3B are a front view (A) and a bottom view (B) showing a detailed enlarged configuration of a dam plate in the embodiment.
FIG. 4 is a plan view showing a state of installation of a joint mechanism in the embodiment.
FIG. 5 is a plan view showing a state of installation of a joint mechanism in the embodiment.
[Brief description of symbols]
DESCRIPTION OF SYMBOLS 1 Reinforcement reinforcement 2 Main reinforcement 3 Floor slab form bottom plate 4 Beam member 5 Dam plate 6 L-shaped clamp
6a L-shaped member
6b Telescopic mechanism

Claims (4)

A first reinforcing bar group extending in the length direction while maintaining an appropriate interval in the width and height directions; and a second reinforcing bar group extending in the width direction while maintaining an appropriate interval in the length and height directions; This is a vertical seam mechanism formed to divide the placement target area in the length direction of the floor slab formwork when placing concrete inside the concrete floor form form formed around And
A beam member extending in the width direction of the floor slab form, and spaced apart in the extension direction of the beam member between the beam member and the bottom of the floor slab form, in a substantially upright state and in a horizontal plane A plurality of dam plates fixed with a degree of freedom of rotation and formed with elastically deforming portions at both left and right ends,
The barrier plate has a width that allows the adjacent members to be brought into close contact with each other while the first reinforcing bar group is interposed by compression of the elastic deformation member in a state where the adjacent members are rotated so as to be parallel to the beam member. A vertical seam mechanism in concrete slab placement. In claim 1,
The floor slab formwork is a floor slab formwork for a bridge, and a vertical joint mechanism in concrete slab placement. In each of claims 1 and 2,
The beam member includes an L-shaped L-shaped member having one end locked to at least one of the first and second reinforcing bar groups, and the other end of the L-shaped member with the surface of the beam member as a fulcrum. A vertical seam mechanism in concrete slab placement, characterized by comprising an upward push-up mechanism. In each of claims 1 to 3,
A vertical seam mechanism for placing concrete floor slabs, wherein a protrusion for entering the bottom of the floor slab form is formed at the center in the width direction of the dam plate.

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