JPH08269917A - Adhering method between concrete floor board and steel beam - Google Patents

Abstract

PURPOSE: To design a steel beam by compounding with a concrete floor board for reducing manufacturing cost. CONSTITUTION: In an adhering method between a concrete floor board and a steel beam, a plurality of recessed parts 5 is provided on the steel beam adhering face of the concrete floor board in parallel to each other at fixed spaces in the direction of a bridge axis, and after injecting adhesive agent 4 in each recessed part 5 into a bited-in state, an extended steel beam 2 is stuck to the steel beam sticking face of the concrete floor board 1 by the adhesive agent 4. The transmission of shearing force between the concrete and an adhesive agent layer is carried out through an irregular biting-in part composed by injecting the adhesive agent 4 into each recessed part 5 of the concrete floor board 1 without expecting strength on an adhesion interface between the concrete floor board 1 and the adhesive agent 4. Thus it is possible to compound the extended steel beam 2 with the concrete floor board 1 for designing the steel beam, and its manufacturing cost is thereby reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adhering a concrete floor slab and a steel girder, which is applied when adhering an additional steel girder to an existing concrete floor slab in a composite main girder additional reinforcement work.

[0002]

2. Description of the Related Art Conventionally, when adhering an expanded steel girder to an existing concrete floor slab in a composite main girder expansion reinforcement work, as shown in FIG.
As shown in FIG. 3, the concrete floor slab 1 and the additional steel girder 2 are bonded by injecting an adhesive 4 such as an epoxy resin between the concrete floor slab 1 and the additional steel girder 2. At this time, in order to prevent injection leakage of the adhesive 4,
The sealant 7 is used. 3 is an existing digit.

[0003]

In the conventional method for adhering the concrete floor slab and the steel girder shown in FIGS. 2 and 3, the interface between the concrete floor slab 1 and the adhesive 4 is a flat surface, and the following problems occur. was there. That is, in the bridge shown in FIG. 2 and FIG.
The purpose of bonding the concrete floor slab 1 and the additional steel girder 2 is to
This is because the vertical load of the concrete floor slab 1 is transmitted to the additional steel girder 2, and it is not expected that the additional steel girder 2 acts as the main girder. That is, the transmission of the shear force in the bridge axis direction between the concrete floor slab 1 and the additional steel girder 2 caused by the additional steel girder 2 acting as the main girder is not considered. For this reason, it was impossible to design the additional steel girder 2 by combining it with the concrete floor slab 1.

The present invention has been proposed in view of the above problems, and an object thereof is to provide a concrete floor slab that can be designed by combining a steel girder with a concrete floor slab and can reduce the cost. The point is to provide a bonding method with steel girders.

[0005]

In order to achieve the above object, a method for adhering a concrete floor slab and a steel girder of the present invention is such that a plurality of recesses are formed in a steel girder adhering surface of a concrete floor slab in the bridge axis direction. It is characterized in that the steel girders are provided in parallel at a predetermined interval, injected into the recesses in a state of being bitten, and then the steel girders are bonded to the steel girder adhering surface of the concrete floor slab with the adhesives.

[0006]

[Function] Generally, the adhesive force of an adhesive such as an epoxy resin to concrete is weaker than that of steel,
The method of bonding the concrete floor slab and the steel girder of the present invention, as described above, a plurality of recesses are provided parallel to the steel girder bonding surface of the concrete floor slab at predetermined intervals in the bridge axis direction, and are bonded to the respective recesses. After injecting the agent in a state of being bitten, the steel girder is adhered to the steel girder adhesive surface of the concrete floor slab with the same adhesive to transfer the shearing force between the concrete and the adhesive layer to the concrete floor slab. Without expecting the strength at the adhesive interface with the adhesive, it is carried out by the concave and convex engaging portion obtained by injecting the adhesive into each concave portion of the concrete floor slab.

[0007]

EXAMPLES Next, a method of adhering a concrete floor slab and a steel girder of the present invention will be explained with reference to an embodiment shown in FIG. 1. Reference numeral 1 is a concrete floor slab, and the steel girder bonding surface of the concrete floor slab 1 is A plurality of recesses 5 are provided in the concrete floor slab 1 in parallel at predetermined intervals in the bridge axis direction. Each recess 5 is arcuate when viewed from the side.

Reference numeral 2 is an expanded steel girder, 6 is an upper flange of the expanded steel girder 2, and 7 is a sealant. When adhering the concrete floor slab 1 and the additional steel girder 2, the sealant 7 for preventing the leakage of the adhesive 4 is installed on both sides of the upper flange 6 of the additional steel girder 2, and then the adhesive 4 is applied to each of them. It is poured into the recess 5 in a state of being bitten, and then the additional steel girder 2 is bonded to the concrete floor slab 1 with the adhesive 4.

Letting L _{1 be} the interval between the recesses 5 provided in the concrete floor slab 1 and L ₂ be the width, L ₁ : L ₂ = τp; τc
(Τp is the shear strength of the adhesive and τc is the shear strength of the concrete), the shear force can be most efficiently transmitted from the concrete floor slab 1 to the adhesive 4.

[0010]

The method for adhering the concrete floor slab and the steel girder of the present invention is configured as described above, and the following effects can be achieved. That is, in general, the adhesive force of an adhesive such as an epoxy resin to concrete is weaker than the adhesive force to steel material, but the method of bonding the concrete floor slab and the steel girder of the present invention has a plurality of concave portions as described above. It is installed parallel to the steel girder adhesive surface at a predetermined interval in the bridge axis direction, and after pouring the adhesive into the recesses, the steel girder is bonded with the adhesive to the steel girder adhesive surface of the concrete floor slab. The adhesive is injected into each recess of the concrete floor slab without expecting the transmission of shearing force between the concrete and the adhesive layer at the strength of the adhesive interface between the concrete floor slab and the adhesive. Since it is performed by the concavo-convex biting portion obtained in this way, the steel girder can be combined with the concrete floor slab to be designed, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 (a) is a vertical sectional front view showing an embodiment of a method of adhering a concrete floor slab and a steel girder of the present invention, and FIG. 1 (b) is a vertical sectional side view thereof.

FIG. 2 is a perspective view showing a conventional method for adhering a concrete floor slab and a steel girder.

FIG. 3 is a vertical sectional front view showing the same bonding method in an enlarged manner.

[Explanation of symbols]

 1 Concrete floor slab 2 Additional steel girder 5 Recess 6 Upper flange of additional steel girder 7 Sealant

Claims (1)

[Claims] 1. A plurality of recesses are provided in parallel on a steel girder adhesive surface of a concrete floor slab at predetermined intervals in the bridge axis direction, and after the adhesive is injected into the recesses, the adhesive is injected. A method for adhering a concrete floor slab to a steel girder, characterized in that the steel girder is adhered to the steel girder adhering surface of the concrete floor slab.