JPH0312890Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field to which the invention belongs) The present invention relates to a composite beam composed of a steel beam and a precast concrete slab.

(Problems of the invention and its features) Japanese Patent Publication No. 53-26048 discloses that a set of two stud dowels is protruded from the upper flange of a steel girder at a predetermined interval, and The end of each prefabricated concrete slab is placed on the flange, and the opposing end surface of the prefabricated concrete slab is made into an inclined surface that approaches the other slab, and a recessed part that is recessed in an arc shape at the stud dowel part is formed. The loop reinforcement formed and embedded in each prefabricated concrete slab is bent into a U-shape and hooked to the stud dowel on the side closer to the other slab, and concrete is filled between both prefabricated concrete slabs to create a prefabricated concrete floor. A technique is disclosed for forming a composite girder consisting of a plate and a steel girder.

This conventional example is superior in that the prefabricated concrete slab and steel girder are strongly integrated to form a composite girder, but since the hoop reinforcements of each prefabricated concrete slab are horizontally stacked, It is necessary to first erect the prefabricated concrete slab with hoop reinforcements protruding downwards, which makes the work more troublesome.Also, since the joint end surface of the prefabricated concrete slab is sloped upward, That much,
There are some disadvantages such as the joint concrete tends to come out upwards.

The present invention takes advantage of the advantages of the prior art and eliminates its disadvantages, and its structural features are as described in the claims of the utility model registration.

(Specific explanation of the invention with drawings) Figure 1 is a perspective view of a structure used for a multi-level parking lot, etc., which is being constructed by applying the present invention, and Figure 2, A and B, are enlarged views of a part of it. They are a plan view and a sectional view.

On the upper surface of the upper flange 2 of the steel beam 1, a set of two stud dowels 3, 3 are erected at appropriate intervals in the length direction, and stud dowels 3 are installed on both side edges of the precast concrete slab 4. , 3 are formed with recesses 5, 5'.

The inner peripheral surfaces of recesses 5 and 5' widen downward (reverse slope)
Loop bars 6, 6' whose tips are bent into a U-shape when viewed from the side are protruded at positions biased to one side within the recesses 5, 5'.

The protruding positions of the loop reinforcements 6 and 6' are different from each other. , 6' are designed to sandwich the stud dowels 3, 3 from both sides.

Reference numeral 7 denotes a spiral reinforcement, which is placed so as to surround the loop reinforcements 6, 6' and the stud dowels 3, 3 as shown in the figure, and then concrete for joints is poured over the entire gap between the precast concrete slabs 4, 4. Then, the steel beam 1 and the precast concrete slabs 4, 4 are integrally joined.

Although the illustrated stud dowels 3, 3 are completely divided into two, they may be formed into an inverted U-shape.

(Effect of the invention) Since the composite beam of the invention is constructed as described above, the steel beam and the adjacent precast concrete slab are firmly integrated through the stud dowels, loop reinforcements, spiral reinforcements, and joint concrete. It can fully demonstrate its performance as a composite beam. In particular, with the composite beam of this invention,
The concrete in the cotter section formed by the opposing recesses is prevented from rising from the steel beam by sloping the inner peripheral surface of the recess downward. The dowel-shaped concrete filled in between is reinforced with spiral reinforcements and effectively restrains the loop reinforcements, completely preventing the side edges from warping due to rotation of the precast concrete slab.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a structure being constructed while applying the present invention, Figure 2 (A) is an enlarged plan view of a portion of Figure 1, and Figure 2 (B) is a sectional view taken along line A-A in Figure 2. be. 1... Steel beam, 2... Upper flange, 3... Stud dowel, 4... Precast concrete floor slab, 5, 5'... Recess, 6, 6'... Loop bar,
7...Spiral muscle.

Claims (1)

[Scope of utility model registration request] A set of two stud dowels are erected at appropriate intervals in the length direction on the upper flange surface of the steel beam.
At positions corresponding to the stud dowels on both sides of the precast concrete floor slab, a recess is formed whose inner circumferential surface slopes downward, and at a position biased to one side within the recess, a recess whose tip is shaped like a U-shape on the side is formed. The side edges of the adjacent precast concrete slabs are placed on the steel beams with the recesses facing each other, and the loop reinforcements of each precast concrete slab are used to connect stud dowels from both sides. A composite beam made of a steel beam and a precast concrete slab, characterized in that spiral reinforcements are arranged so as to sandwich the loop reinforcements and stud dowels, and concrete is poured for the joints in this state.