JPH0814161B2 - Concrete slab joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Field of Industrial Application >> The present invention relates to a jointing structure for a concrete slab,
Particularly, the present invention relates to a splicing structure of a concrete slab for closing the opening after the completion of the unloading work when the floor slab has an opening for cargo handling during construction.

<< Prior Art >> As a conventional joint structure for concrete slabs, the technologies described in JP-A-61-290551 and JP-B-62-8295 are known.

Here, in order to close the unloading opening 22 formed in the floor slab 21 for unloading materials, etc., to form a flat flush floor, as shown in FIG. 4 to FIG. The floor slab 21 is placed on the beam 24 on which the F deck 23 supporting the slab 21 is erected.
Side and the opening 22 side are divided and a stop frame 25 for damming the concrete placed on the F deck 23 is detachably installed,
Next, the insertion hole 26 formed in the stop frame 25 is extended from the floor slab 21 side to the opening 22 side to provide the differential line 27 as a shear connector, and then concrete is placed on the F deck 23. Then, the concrete slab 28 is constructed, and then the opening side extending portion 27a of the differential bar 27 is bent so as not to hinder the unloading work, and after the unloading work is completed, the opening side extending part 27a of the differential bar 27 is formed. The F deck so that it extends back to the opening 22 and then closes the opening 22 on the beam 24.
23 is erected, the stop frame 25 is removed at the end, and the F deck 23
Concrete is placed on the top of the concrete slab 29 for jointing.

<< Problems to be Solved by the Invention >> However, in the above-mentioned concrete slab splicing work, installation and removal of the stop frame 25, formation of the insertion port 26 for inserting the differential line to the stop frame 25, and the differential line There are various works such as inserting 27 into the insertion opening 26 and bending and stretching the differential line 27 twice, and there has been a problem that complicated works must be carried out by workers of various occupations.

The present invention was created in order to solve the above-mentioned problems, and while achieving labor saving and cost reduction by reducing the type of work or man-hours, a concrete slab that can secure a sufficient anchoring action. The purpose is to provide a splice structure.

<< Means for Solving the Problem >> The present invention is to extend a shear connector from the floor slab side into a unloading opening sectioned and formed in the floor slab by a stop frame installed on a beam, and to pour concrete. With respect to the floor slab, in the splicing structure of the concrete slab that splices the concrete slab that blocks the opening, while joining the stop frame to the beam, the stop frame,
A shear connector formed by a ring streak having a dimension substantially equivalent to a beam width and protruding toward both the floor slab side and the opening side with the stop frame interposed is joined.

<< Operation >> To describe the operation of the present invention, by installing the stop frame on the beam, installation and removal of the stop frame can be eliminated.
In addition, the shear that is projected to both the floor slab side and the opening side
By connecting the connector to the connector by sandwiching the stop frame,
It is possible to eliminate the formation of the insertion opening for the stop frame and the insertion work into the insertion opening. Furthermore, since the shear connector is formed by a ring streak having a dimension substantially equivalent to the beam width, and is made to project to both the floor slab side and the opening side with the stop frame sandwiched between them, the shear connector is slightly outside the beam. The shear connector does not hinder the unloading work, and the bending and stretching work twice can be eliminated. As described above, the splicing work can be performed mainly by the joining work of the shear connector and the stop frame formed by the ring streak. On the other hand, since the shear connector is ring-shaped, it can bear a considerable fixing surface area with a short length, and exhibits an anchor function equivalent to that of a long differential streak.

<Example> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side sectional view of the concrete slab splicing structure of the present invention when the opening is opened, and FIG. 2 is II- in FIG.
A sectional view taken along the line II and FIG. 3 are side sectional views after the concrete slab is spliced.

The present invention basically comprises extending a shear connector from the floor slab 3 side into a unloading opening 4 defined in the floor slab 3 by a stop frame 2 installed on the beam 1 and pouring concrete. In a splicing structure of a concrete slab that splices a concrete slab 6 that closes the opening 4 with respect to the floor slab 3, the stop frame 2 is joined onto the beam 1 and the stop frame 2 is approximately equivalent to the beam width. Ring muscle 5 with dimensions
And a shear connector that is formed on the floor slab 3 side and the opening 4 side with the stop frame 2 interposed therebetween.

As shown in the figure, in the concrete slab joint construction of this embodiment, the floor slab 3 is welded on the beam 1 to define the unloading opening 4 in the floor slab 3 and the floor slab 3 is formed around the opening 4. A stop frame 2 for damming the concrete to be cast as much as possible, and a shear connector barrel ring formed by welding the open ends of the U-shaped streaks 5a to both sides of the opening 4 side and the floor slab 3 side of the stop frame 2. Mainly composed of the muscle 5.

Specifically, the stop frame 2 is made of an iron plate so as to be welded to the beam 1 and the ring reinforcement 5. Then, on both side surfaces of the stop frame 2, the open ends of the U-shaped streaks 5a which are manufactured in advance are provided.
Are welded to each other in the vertical direction in the height direction, and their folded ends project slightly outward from the flange 1a of the beam 1. In particular, in this embodiment, since the ring streaks 5 composed of these U-shaped streaks 5a are arranged in the height direction of the stop frame 2, the folded-back end is extended to the outside of the end edge of the flange 1a. Even if I try
Compared to the case where the streak 5a is arranged in the horizontal direction, there is almost no obstacle to the unloading work. Further, the ring streak 5 is folded back in spite of its short outer dimension and has a considerable fixing surface area, so that it exhibits a sufficient anchoring function when it is embedded in concrete.

On the other hand, the stop frame 2 is attached by welding along the center line of the flange 1a of the beam 1 when constructing the F deck 7. F
The deck 7 is configured by forming ribs 7a having a triangular cross section on a plate material. The F deck 7 is installed between the beams 1 when closing the floor slab 3 side and the opening 4.

Next, the construction of the jointing structure of the concrete slab configured as described above will be described.

First, the F deck 7 on the floor slab 3 side is installed outside the beam 1 arranged so as to surround the opening 4, and the stop frame 2 is welded and fixed on the beam 1 so as to partition the opening 4. To do.
After that, U is applied to the opening 4 side of the stop frame 2 and the floor slab 3 side.
The open ends of the character-shaped streaks 5a are welded to each other to form the ring streaks 5 having a dimension substantially equivalent to the beam width and protruding toward both the floor slab 3 side and the opening 4 side with the stop frame 2 interposed therebetween. Next, concrete is placed on the F deck 7 on the floor slab 3 side to form the floor slab 3 with the ring reinforcement 5 embedded therein.

With the floor slab 3 thus formed, the unloading work is carried out from the opened opening 4. On this occasion,
The U-shaped streak 5a forming the ring streak 5 on the side of the opening 4 has a folded end that extends slightly outward from the flange 1a of the beam 1, and therefore does not hinder the unloading work. In addition, in this embodiment, since the ring streak 5 is folded back up and down in the height direction, even if the load contacts the ring streak 5, the load is still loaded.
It will be smoothly pulled up by being guided by the curved folded end of the.

After the unloading work is completed, the F deck 7 on the side of the opening 4 is erected on the beam 1 so as to close the opening 4. After that, concrete is poured on the F deck 7, and the concrete slab 6 is spliced to the floor slab 3 with the ring reinforcement 5 embedded therein. 4 can be closed to form a flat and flush floor.

<< Effects of the Invention >> In short, according to the present invention, the following excellent effects are exhibited.

By installing the stop frame on the beam, the installation and removal work of the stop frame can be eliminated. Further, the shear connector protruding toward both the floor slab side and the opening side is joined to the stop frame by sandwiching the stop frame, so that the formation of the insertion opening for the stop frame and the insertion work into the insertion opening can be eliminated. .
Furthermore, since the shear connector is formed by a ring streak having a dimension substantially equivalent to the beam width, and is made to project to both the floor slab side and the opening side with the stop frame sandwiched between them, the shear connector is slightly outside the beam. The shear connector does not hinder the unloading work, and the bending and stretching work twice can be eliminated. As described above, the splicing work can be performed mainly by the joining work of the shear connector and the stop frame formed by the ring streak. On the other hand, since the shear connector has a ring shape, a considerable fixing surface area can be obtained with a short length, and an anchor function comparable to the conventional long streak can be secured.

[Brief description of drawings]

FIG. 1 is a side sectional view of the concrete slab splicing structure of the present invention when the opening is opened, and FIG. 2 is II-II in FIG.
Fig. 3 is a sectional view taken along the line of arrows, Fig. 3 is a side cross-sectional view after concrete slab jointing, and Figs. 4 to 7 are views for explaining the construction of a conventional joint joint structure for concrete slabs. 1 ... Beam, 2 ... Stop frame 3 ... Floor slab, 4 ... Unloading opening 5 ... Ring reinforcement, 6 ... Concrete slab

Claims (1)

[Claims] Claim: What is claimed is: 1. By extending a shear connector from the floor slab side and placing concrete in the unloading opening sectioned and formed on the floor slab by a stop frame installed on the beam, to the floor slab, In a splicing structure of a concrete slab for striking a concrete slab that blocks the opening, while joining the stop frame to the beam, the stop frame,
A concrete slab is formed by joining a shear connector which is formed by a ring streak having a size substantially equivalent to a beam width and which is projected to both the floor slab side and the opening side with the stop frame interposed therebetween. Joint structure.