JPH024962Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of reinforced concrete slab joints.

Reinforced concrete plates such as prestressed concrete plates are used for prefabricated walkways, building floor slabs, and wall materials. Conventionally, this type of reinforced concrete slab was constructed by butting the end sides of the slab to be constructed on the steel beam with a gap, and then attaching the anchor fittings protruding from each end side to the steel beam in the gap. It is fixed by welding or tightening nuts and is constructed by filling the gap with mortar.

However, in the joints of reinforced concrete slabs formed by this method, some of the anchor fittings protruding from the end sides of the slab are buried and fixed in the slab, and furthermore, the tip of the anchor fittings is fixed to the beam steel by welding or tightening nuts, so when the plate repeatedly contracts and expands due to temperature changes, the stress is not completely absorbed.
Cracks occurred in the plate, and the welding of the anchor fittings came off, causing the plate to warp and sag.

The present invention provides a joint structure that can prevent reinforced concrete slabs from cracking and warping due to temperature changes. The present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 and 1' are reinforced concrete plates, which are prestressed concrete plates reinforced with PC steel wires 12 and 12'.
Incidentally, reference numerals 13 and 13' are through holes provided in the plates 1 and 1', which are provided to reduce the weight and improve the strength of the plates 1 and 1'. Reference numeral 2 is a beam steel, which is made of H-beam steel plated in hot-dip zinc.

Thus, the end side surface 11 of the plate 1 and the end side surface 11' of the plate 1' are abutted on the steel beam 2 with a gap 3 in between. The dimensions of this gap 3 are between plate 1 and plate 1'
It is determined appropriately, taking into consideration the contraction, expansion, and construction workability. A bituminous joint plate 7 is attached to the end side surface 11 of the plate 1. This bituminous grout plate 7 is provided to more effectively prevent mortar from entering the through hole of the anchor fitting, which will be described later, and to absorb stress in the plate. The base plate 7 does not necessarily have to be provided.

A deep and wide through hole 6 is formed inwardly from the end side surface 11 of the reinforced concrete slab 1. That is,
This deep and wide through hole 6 has a through hole portion 61 and a through hole portion 6.
It has a deep part 62 that is wider than the diameter of 1. This deep and wide through hole 6 allows the flanged tube 8 made of plastic or metal to be inserted into the through hole 1 of the plate 1.
3 and the outer surface of the flanged tube 8 and the through hole 13.
It is formed by filling the space between the inner surface and the inner surface with mortar 9. Note that instead of the flanged tube 8, a flanged tube may be used. As above,
When forming a deep and wide through hole 6 using the through hole 13 of the plate 1 and using the flanged cylinder 8, the part of the flanged cylinder 8 becomes the through hole part 61 of the through hole 6, and the through hole 6 is formed by using the flanged cylinder 8. The hole 13 becomes the inner part 62 of the through hole.

Further, a part of the anchor metal fitting 4 such as a hot-dip galvanized anchor bolt is inserted into the deep wide through hole 6, and a loose end portion 43 is left at the end portion 42 of the anchor fitting 4. A stop 44 is integrally formed. This play portion 43 is for absorbing the contraction and expansion of the plate 1, and its dimensions are appropriately determined in consideration of the contraction and expansion of the plate 1. In addition, the stopper 44 of the tapered end is used to prevent the plate 1 and the anchor metal fittings 4 from falling off during or after the construction of the plate 1.
This is to prevent the anchor fitting 4 from coming off, and may be formed by attaching a nut to the distal end portion 42 of the anchor fitting 4.

There are various methods for inserting the anchor fitting 4 into the deep and wide through hole 6. For example, after first inserting a part of the anchor fitting 4 without the retainer 44 into a separately manufactured tube 8, the retainer 44 is formed at the end portion 42 by welding or screwing, and then the tube 8 is is inserted into the center of the through hole 13, and the space between the cylinder 8 and the through hole 13 is filled with mortar 9 from the end side surface 11 of the plate 1. Further, when manufacturing the reinforced concrete slab 1, a deep and wide through hole 6 may be formed and the anchor fitting 4 may be inserted therethrough.

Thus, the anchor fitting 4 is attached to the end side surface 11 of the plate 1.
The distal end portion 41 of the protruding anchor metal fitting 4 is fixed by welding to the beam steel 21 in the gap between the plates 1 and 1'. Further, a portion of an anchor fitting 4' such as a hot-dip galvanized anchor bolt is buried inward from the end side surface 11' of the plate 1'. This anchor fitting 4' is buried by inserting a part of the anchor fitting 4' into the through hole 13' at the end side of the plate 1', and then inserting the anchor fitting 4' in the inserted part and the through hole 1.
This was done by filling the space between 3' and 3' with mortar 9'. Note that the anchor metal fittings 4' may be buried when the reinforced concrete slab 1' is manufactured.

Thus, the anchor fitting 4' is provided in a protruding manner on the end side surface 11' of the plate 1, and the distal end 41' of the protruding anchor fitting 4' is similar to the distal end 41 of the anchor fitting 4 in that it connects the plate 1 with the plate 1. It is fixed by welding to the beam steel 21 in the gap between '. In addition, in the present invention, instead of fixing by welding as described above, the tips 41, 41' of the anchor fittings 4, 4' are inserted into holes provided in the beam steel 21 in the gap between the plates 1 and 1'. Insert it into the
It may be fixed by tightening a nut. Furthermore, version 1
A gap 3 between the plate 1' and the plate 1' is filled with mortar 5 as a joint material to form the joint of the present invention.

As detailed above, in the reinforced concrete slab joint of the present invention, the end side surfaces of the reinforced concrete slab are butted together on the beam steel with a gap, anchor fittings are provided protruding from each end side surface, and each anchor fitting The tip of the reinforced concrete slab is fixed to the beam steel in the gap by welding or tightening with nuts, so the reinforced concrete slab will not move and separate from the beam steel, as in the past, and the reinforced concrete slab can be erected with excellent safety. A structure is obtained.

Moreover, in the present invention, one of the anchor fittings is partially inserted into a deep and wide through hole formed inward from the end side of the reinforced concrete slab, leaving a play part at the end and a thick tip. Since a retainer is formed, even if the reinforced concrete slab repeatedly expands and contracts due to temperature changes and stress is generated, the reinforced concrete slab will move freely in the axial direction of the anchor fitting, and the expansion and contraction stress will be completely absorbed by the loose part of the anchor fitting. It is possible to prevent the printing plate from becoming distorted and the printing plate from warping. Also, the thick tip formed on the anchor fitting prevents the printing plate from falling off from the anchor fitting, making it safe. be.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an example of the present invention;
FIG. 2 is a sectional view taken along the line of FIG. 1. 1,1'...Reinforced concrete version, 11,1
1'... End side surface of the plate, 2... Beam steel, 21... Beam steel in the gap, 3... Gap between the plates, 4, 4'... Anchor fitting, 41, 41'... Tip of the anchor fitting Department,
42... End part of anchor metal fitting, 43... Play part, 44... Preventing tip from coming off, 5... Mortar,
6...The hole in Okuhiro.

Claims (1)

[Scope of utility model registration request] End side surface 11, 1 of reinforced concrete slab 1, 1'
1' are butted on the beam steel 2 with a gap 3,
Anchor fittings 4,
4' is provided protrudingly, and the tip ends 41, 41' of each anchor fitting 4, 4' are fixed to the beam steel 21 in the gap,
At the joint where the gap 3 is filled with mortar 5, one of the anchor fittings 4 is partially inserted into a deep and wide through hole 6 formed inward from the end side surface 11 of the reinforced concrete slab 1. At the end part 42, a loose end 44 is formed leaving a play part 43, and the other anchor fitting 4' is partially buried inward from the end side surface 11' of the reinforced concrete slab 1'. The structure of reinforced concrete slab joints is characterized by: