JPH0317336A - Structure for construction joint of concrete slab - Google Patents

Abstract

PURPOSE:To make installation and removal of bulkheads unnecessary by welding a stop-end plate for damming up concrete to a beam at an opening for unloading partitioned with stop-end plates at a floor slab, and by making a ring bar pro trude from the floor slab to the opening side. CONSTITUTION:An F deck 7 on the floor slab 3 side is installed at the outside of beams 1 surrounding an opening 4, and a stop-end plate 2 for damming up concrete is fixed by welding to the upper side of the beam 1, and the opening 4 is formed being partitioned therewith. U-shaped bars are then bonded by welding to the opposite faces of the stop-end plate with their opening-side attached longitudinally to the plate, making the length of extension from the welded point the same as the width of a flange 1a of the beam 1. Then concrete is placed over the F deck 7 and the slab 3 is formed thereby. Unloading is carried out using the opening 4. After finishing the unloading, the F deck 7 is installed to the opening 4 side and the concrete is placed thereon forming a concrete slab 6 with a construction joint, and the opening 4 is closed thereby.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a concrete slab pouring structure, and in particular, when the floor slab has an opening for loading and unloading during construction, the unloading operation is completed. This invention relates to a concrete slab pouring structure for later closing the opening.

<<Prior Art>> As a conventional concrete slab pouring structure, the techniques described in Japanese Patent Application Laid-Open No. 61-229051 and Japanese Utility Model Publication No. 62-8295 are known.

Here, in order to close the unloading opening 22 opened in the floor slab 21 for unloading materials, etc. and form a flat, flush floor, as shown in FIGS. 4 to 7, the floor is opened. Slap 2
1, on the beam 24 on which the F deck 23 supporting the F deck 23 is constructed, partitioning the floor slab 21 side and the opening 22 side
A stop frame 25 for damming the concrete to be placed above is removably installed, and then an insertion hole 26 formed in the stop frame 25 is installed.
Next, a differential bar 27 is provided extending from the floor slab 21 side to the opening 22 side as a shear connector, and then concrete is poured on the F deck 23 to construct a concrete slab 28. Opening side extension portion 2 of differential reinforcement 27
7a, so as not to interfere with the unloading work,
After the unloading work is completed, the opening side extension portion 27 of the differential reinforcement 27
a to the opening 22 as before, then construct the F deck 23 on the beam 24 so as to close the opening 22, and finally remove the retaining frame 25 and install the F deck 23.
Concrete is poured on top and the two concrete slabs are poured together.

(Problem to be Solved by the Invention) However, in the above-mentioned concrete slab pouring work, the installation and removal of the stop frame 25, the shape of the insertion hole 26 for inserting the reinforcement into the stop frame 25, and the difference Insertion port 26 of muscle 27
There are various operations such as insertion into the rebar 27 and bending and straightening the rebar 27 twice, and there is a problem in that the complicated operations must be performed by workers of various occupations.

The present invention was devised to solve the above-mentioned problems, and it provides a concrete slab that can ensure sufficient anchoring action while reducing the number of jobs and man-hours to achieve labor savings and cost reduction. The purpose is to provide a spliced structure.

<Means for Solving the Problems> The present invention extends a shear connector from a floor slab through a stop frame to a loading opening formed in the floor slab and partitioned by a stop frame installed on a beam. In a concrete slab joint structure in which poured concrete is poured and the concrete slab is connected to the floor slab, the stop frame is connected to the beam, and the shear connector is opened from the floor slab through the stop frame. It is characterized in that it is formed of a ring line that extends approximately the width of the beam over the entire length and is connected to the retaining frame.

<<Function>> Describing the function of the present invention, by joining the stop frame to the beam, the installation and removal work of the stop frame can be eliminated. Furthermore, by joining the shear connector to the stop frame, it is possible to eliminate the work of forming an insertion hole in the stop frame and inserting it into the insertion hole. Furthermore, by forming the shear connector with a ring striation that extends approximately the width of the beam from the floor slab to the opening via the retaining frame, the shear connector will not become an obstacle to unloading operations, and This eliminates the need for bending and stretching work. In this way, the piecing work can be carried out mainly by joining the shear connector and the stopper frame formed by the ring threads. On the other hand, since the shear connector is ring-shaped, it can gain a considerable anchoring surface area with a short length, and exhibits the same anchoring function as a long shear connector.

{Implementation example} Below. , preferred embodiments 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 open, FIG. 2 is a front view thereof, and FIG. 3 is a side sectional view after the concrete slab is spliced.

Basically, the present invention connects a shear connector from the floor slab 3 via the stop frame 2 to a loading opening 4 defined by a stop frame 2 installed on a beam 1 and opened in the floor slab 3. In the concrete slab joint structure in which the concrete slab 6 is poured onto the floor slab 3 by extending concrete and pouring concrete, the stop frame 2 is joined to the beam 1, and the shear connector is connected to the stop frame 2. It is formed by a ring striation 5 extending from the floor slab 3 to the opening 4 by approximately the width of the beam, and is joined to the stop frame 2.

As shown in the figure, the concrete slab pouring structure of this embodiment is welded onto a beam 1 to define an opening 4 for unloading in the floor slab 3, and to form the floor slab 3 around this opening 4. A retaining frame 2 for damming concrete to be poured, the opening 4 side of this retaining frame 2, and the floor slab 3.
It is mainly composed of ring striations 5 which are shear connectors formed by welding the open ends of U-shaped striations 5a on both sides.

Specifically, the stop frame 2 is made of a steel plate so that it can be welded to the beam 1 and the ring reinforcement 5. Then, on both sides of this stop frame 2, the open ends of the U-shaped strips 5a manufactured in advance are attached to the stop frame 2.
are welded together vertically in the height direction, and their folded ends extend to approximately the same width as the flange 1a of the beam 1 or to a slightly more outward extent than the flange 1a. In particular, in this embodiment, these U
Since the ring striations 5 made up of the U-shaped striations 5a are arranged in the height direction of the retaining frame 2, even if the folded end extends outward from the edge of the flange 1a, the U-shaped striations 5a cannot be moved horizontally. This poses almost no obstacle to unloading operations compared to the case where the Further, although the ring reinforcement 5 has a short external dimension, it is folded back and has a considerable anchoring surface area, so that it exhibits a sufficient anchoring function when embedded in concrete.

On the other hand, the retaining 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 constructed by forming a lip 7a having a triangular cross section on a plate material. This F deck 7 is constructed between the beams 1 when closing the floor slab 3 side and the opening 4.

Next, construction of the concrete slab pouring structure constructed as described above will be explained.

First, the F deck 7 on the floor slab 3 side is erected on the outside of the beam 1 arranged so as to surround the opening 4, and the retaining frame 2 is welded and fixed onto the beam 1 so as to partition this opening 4. do. Thereafter, the open end of the U-shaped bar 5a is welded to the opening 4 side of the stopper frame 2 and the floor slab 3 side, and a substantially beam is formed from the floor slab 3 side to the opening 4 side via the stopper frame 2. A ring line 5 extending in width is formed. Next, F deck 7 on the floor slab 3 side
A floor slab 3 is formed by pouring concrete on top and embedding ring reinforcements 5 therein.

With the floor slab 3 thus formed, unloading work is carried out through the opened opening 4. At this time, the folded ends of the ring striations 5 on the side of the opening 4 have approximately the same width as the flange 1a of the beam 1, or extend slightly outward from the flange 1a of the beam 1, so that they do not become an obstacle to the unloading work. Furthermore, in this embodiment, since the ring striations 5 are folded up and down in the height direction, even if a load comes into contact with the ring striations 5, the load will be guided by the curved folded ends of the ring striations 5 and pulled up smoothly. It will be done.

After the unloading work is completed, the F deck 7 on the opening 4 side is constructed on the beam 1 so as to close the opening 4. After that, concrete is poured on this F deck 7, and ring reinforcement 5
By pouring a concrete slab 6 onto the floor slab 3 with the concrete embedded therein, it becomes possible to close the unloading opening 4 made in the floor slab 3 and form a flat, flush floor. ing.

(Effects of the Invention) In summary, according to the present invention, the following excellent effects are achieved.

By joining the stop frame to the beam, it is possible to eliminate the work of installing and removing the stop frame. Furthermore, by joining the shear connector to the stop frame, it is possible to eliminate the work of forming an insertion hole in the stop frame and inserting the work into the insertion hole. Furthermore, by forming the shear connector with a ring striation that extends from the floor slab to the opening through the stopper frame,
Shear connectors do not become an obstacle to unloading operations,
It is possible to eliminate the bending and stretching work that takes place twice. In this way, it is possible to carry out the splicing work, mainly the work of joining the shear connector and the stopper frame formed with ring threads. On the other hand, since the shear connector is ring-shaped, it can gain considerable anchoring surface area with a short length.
It is possible to secure an anchor function that is comparable to that of conventional long crossbars.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of the concrete slab splicing structure of the present invention when the opening is open, Fig. 2 is its front view, Fig. 3 is a side sectional view after the concrete slab is spliced, and Figs. 7
The figure is a diagram illustrating the construction of a conventional concrete slab pour joint structure.

Claims (1)

[Claims] A shear connector is extended from the floor slab through the stop frame and concrete is poured into the unloading opening defined by the stop frame installed on the beam and formed in the floor slab. In a concrete slab joint structure in which concrete slabs are joined to each other, the stop frame is joined to the beam, and the shear connector is connected from the floor slab to the opening via the stop frame. A concrete slab pouring structure characterized in that it is formed of ring reinforcement extending approximately in width of the beam and is connected to the above-mentioned retaining frame.